CN104632110A - Continuous circulation drilling technology suitable for gas-liquid two-phase flow drilling - Google Patents
Continuous circulation drilling technology suitable for gas-liquid two-phase flow drilling Download PDFInfo
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- CN104632110A CN104632110A CN201310564712.1A CN201310564712A CN104632110A CN 104632110 A CN104632110 A CN 104632110A CN 201310564712 A CN201310564712 A CN 201310564712A CN 104632110 A CN104632110 A CN 104632110A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
Abstract
The invention discloses a continuous circulation drilling technology suitable for gas-liquid two-phase flow drilling. The technology comprises a gas injection unit, a safe pressure relief mechanism, a gas-liquid mixing device and a gate valve control system; and the gas injection unit, the safe pressure relief mechanism, the gas-liquid mixing device and the gate valve control system are connected in sequence in operation. Then, a main circulation channel leaded out from the gate valve control system is connected into a vertical pipe, a collateral circulation channel with a pressure gauge is connected to a drill stand for future use, and a pressure relief channel is connected to a circulation tank. In normal drilling operation, a gas phase and a liquid phase are evenly mixed through the gas-liquid mixing device to enter the gate valve control system for circulating through a main circulation channel; and in single connection or round trip, a gas-liquid two-phase flow enters a drill for circulating through the gate valve control system by the collateral circulation channel. The technology solves such problems as great underground pressure fluctuation, low drilling efficiency and blockage of drilling due to fall back of chips caused by stop of single connection and round trip circulation in the large effluent stratum gas-liquid two-phase flow drilling process, and largely improves the gas drilling efficiency and safety.
Description
Technical field
The present invention relates to a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well, for wellbore construction operation, belong to oil and gas well drilling technology field.
Background technology
In recent years, domestic gas base flow body drilling technology is just with the advantage fast development of its uniqueness, and application drilling depth, well improve year by year, in raising rate of penetration, improvement leakage, discovery and reservoir protec-tion, played important function.But overall application is seen, formation water output is the bottleneck of restriction gas base flow body drilling technology application, except Chongqing of Sichuan and Some Regions, Xinjiang, and other area not large scale application.
Have the atomization of gas-liquid two-phase flow pattern, foam, air-filling well-drilling technology achieve comparatively much progress in reply formation water output, change the passive situation of gas base flow body drilling well in early stage " water breakthrough just runs ", application drilling depth ratio progressively improves, but still there are the following problems:
One, large water-yielding stratum connects due to shaft bottom hydrops after column, and pressure oscillation is large, declines of fluctuating again after pressure first raises, and before again stable, drilling speed comparatively slowly, had a strong impact on gas drilling efficiency and flooring-safe.
Two, the stratum that after water outlet, borehole wall stability is poor, stops circulation making up a joint, and local is slightly fallen block and do not taken the bulky grain landwaste falling accumulation of pit shaft out of, there is larger down-hole risk.
Three, after large water-yielding stratum connects column, bottom hole pressure surge is large, and downhole fluid equal yield density is unstable, its corresponding instability of buoyancy produced drill string, thus it is larger to cause Bottom Hole Bit Weight In A to fluctuate.
Four, after air-filling well-drilling makes up a joint, pressure oscillation is large, and liquid level is unstable, not easily judges whether down-hole overflow occurs, and there is potential safety hazard.In addition, in the trip-out process of Holes of Complicated Wells section, often need air feed to keep circulation ability carries drilling tool, once stop gas injection, then can not on carry drilling tool, and there is larger bit freezing risk.
Therefore, a kind of technology that biphase gas and liquid flow drilling well can be kept uninterruptedly to circulate is badly in need of.
Chinese patent 201210561390.0, disclose a kind of continuous cyclic drilling technique being applicable to air drilling, this technique first connects the supply air line of supercharger to air supply controller, two-way is divided to be connected to continuous circulation short circuit again, the continuous circulation in air drilling situation can be realized, but lack gas-liquid mixing process in this technique, its seal member also can only seal pure air, can not realize the continuous cyclic drilling in the biphase gas and liquid flow drilling well situations such as atomization, foam, inflation.
Chinese patent 2011101301394, discloses a kind of oil drilling uninterrupted continuous circulation short circuit and continuous circulation method for slurry thereof, and this continuous circulation short circuit comprises short circuit body, automatic center valve and the normally closed ball-and-seat of side direction.This short circuit seal member can only seal liquid phase, gas phase and gas-liquid mixed phase can not be sealed, air pressure can not be born, so this pipe nipple is only applicable to mud drilling, can not be applicable in biphase gas and liquid flow drilling well, and this short circuit does not have relief valve, the pressure of trap in drilling rod can not be released when other valve invalidations, there is potential safety hazard.
Summary of the invention
The object of the invention is to the problems referred to above overcoming prior art existence, a kind of continuous cyclic drilling technique being applicable to the biphase gas and liquid flow drilling wells such as air-mist drilling, foam drilling, air-filling well-drilling is provided.The present invention can make up a joint in biphase gas and liquid flow drilling wells such as atomization, foam, inflations, keep gas phase, liquid phase all uninterruptedly to circulate in the process that makes a trip, thus avoids the hole collapse that shaft bottom hydrops causes, and reduces bit freezing risk, improves drilling efficiency.
For achieving the above object, the technical solution used in the present invention is as follows:
Be applicable to a continuous cyclic drilling technique for biphase gas and liquid flow drilling well, it is characterized in that: comprise the Joining Technology of ground installation, connect column or single process and trip-out technique;
The Joining Technology of described ground installation is: ground installation comprises air injection unit, safety relief mechanism, Liqiud-gas mixing device, gate valve control system, connects air injection unit, safety relief mechanism, Liqiud-gas mixing device and gate valve control system during operation successively; Gate valve control system, by major cycle passage access standpipe, is received rig floor by side circulation canal for subsequent use, is connected to circulating tank by pressure release passage;
Describedly connect column or single process is as follows:
A, under get into the end after, in the end first circulation guiding pipe nipple is accessed, major cycle channel connection in a drilling rod top, and gas-liquid two-phase flows through major cycle passage, standpipe enters drilling tool circulation, start normal biphase gas and liquid flow drilling well, column for subsequent use or single top access next circulation guiding pipe nipple;
B, bored column or single after, above carry drilling tool and sit slips or elevator, be connected with first lead side valve of pipe nipple of circulate by side circulation canal, gate valve control system controls side circulation canal unlatching, and gas-liquid two-phase flows through side circulation canal and enters drilling tool and circulate; After side circulating pressure is normal, gate valve control system controls major cycle pathway closure, and pressure release passage is opened, release standpipe pressure;
C, standpipe pressure are after zero, from the pipe nipple top shackle of first circulation guiding, then access column for subsequent use or single;
D, gate valve control system control major cycle passage and open, and gas-liquid two-phase flows through major cycle passage and enters drilling tool circulation, and gate valve control system controls side circulation canal and closes, and pressure release passage is opened, release side circulation canal pressure; Side pipeloop pressure is after zero, dismantles the connection of side valve and side circulation canal, and card taking watt or elevator, recover to creep into;
E, repetition above-mentioned steps, realize the continuous circulation of biphase gas and liquid flow drilling well;
Described trip-out technique is as follows:
A, on carry column or singlely go out turntable surface to lower continuous circulation valve, sit elevator or slips, side circulation canal be connected with first lead side valve of pipe nipple of circulating;
B, gate valve control system control side circulation canal and open, and gas-liquid two-phase flows through survey circulation canal and enters drilling tool circulation, and after side circulation canal pressure is normal, gate valve control system controls major cycle pathway closure, and pressure release passage is opened, and discharges standpipe pressure;
C, standpipe pressure are after zero, shackle, trip out column or single, then are driven on top or kelly bar connects with well head continuous circulation valve;
D, gate valve control system control major cycle passage and open, and side circulation canal is closed, and pressure release passage is opened, release side circulation canal pressure;
When e, side circulation canal pressure are zero, dismantle the connection of side valve and side circulation canal, get elevator or slips, continue to pull out of hole.
Described Liqiud-gas mixing device comprises the inner core for air inlet and the urceolus for feed liquor, gas-liquid mixed interface Liqiud-gas mixing device being provided with the gas injection interface be communicated with inner core, the fluid injection interface be communicated with urceolus and being communicated with urceolus, throughly on inner tube wall be provided with through hole, inner core is communicated with urceolus by through hole, fluid injection interface is connected to slush pump by pipeline, circulating tank is connected to by slush pump, gas injection interface is connected to safety relief mechanism by pipeline, and gas-liquid mixed interface is connected to gate valve control system.
Described gate valve set-up of control system is between standpipe and Liqiud-gas mixing device, comprise major cycle passage gate, side circulation canal gate and pressure release gate, major cycle passage gate is connected to major cycle passage, and side circulation canal gate is connected to side circulation canal, and pressure release gate is connected to pressure release passage.
Described side circulation canal is provided with the pressure monitoring table for monitoring the pressure condition in the circulation canal of side.
Described circulation guiding pipe nipple is provided with main valve, side valve and relief valve, and main valve is arranged in nipple body, and relief valve is arranged on the sidewall of nipple body above main valve, and side valve is arranged on the sidewall of nipple body below main valve.
Described main valve is arranged on nipple body center, and coaxial with nipple body.
Described relief valve latus rectum is less than side valve latus rectum.
Employing the invention has the advantages that:
One, the present invention can make up a joint in biphase gas and liquid flow drilling process, round trip maintenance is uninterrupted circulates, reduce the fluctuation of bottom pressure, decrease the time needing owing to interrupting circulation again to recover required for bottom pressure, make shaft bottom be in the under-balanced state of needs always, can effectively improve water-yielding stratum drilling efficiency; Meanwhile, the stratum that after water outlet, borehole wall stability is poor, stops circulation making up a joint, local is slightly fallen block and is not taken the bulky grain landwaste falling accumulation of pit shaft out of, bring bit freezing risk, this continuous circulation process will make pit shaft keep uninterrupted circulation, avoid landwaste and fall the risk of piling up and causing bit freezing after rise.
Two, the present invention is provided with Liqiud-gas mixing device between pressure relief mechanism and gate valve control system, this device is provided with inner core and urceolus, interior same air inlet, urceolus feed liquor, gas phase can in urceolus Homogeneous phase mixing in liquid phase, gas phase and the liquid phase that can ensure to enter gate valve control system mix, and reduce the generation of slug flow in pit shaft, add the reliability and safety of this technology.
Three, the present invention is provided with safety relief mechanism between air injection unit and Liqiud-gas mixing device, the fast shut-off that can (such as build the pressure when there are abnormal conditions, maloperation, down-hole are complicated) injects the gas of gate valve control system, by bypass valve, relief valve pressure release, ensure that the safety of equipment and personnel.
Four, the circulation guiding pipe nipple adopted in the present invention comprises nipple body, main valve, side valve and relief valve, relief valve is arranged on the sidewall of nipple body above main valve, when main valve and side valve inefficacy can not normally be opened, Compressed Gas will form trapped pressure between two circulating valves, by the pressure releasing trap in drilling rod that relief valve can be safe, subsequent job can be carried out safely.
Five, in the circulation guiding pipe nipple that the present invention adopts, described relief valve latus rectum is less than side valve latus rectum, adopts this structure, and the pressure reliability of releasing trap in drilling rod is higher.
Traditional continuous circulation short circuit and technique or be only applicable to mud drilling, or be only applicable to air drilling, the present invention is applicable to the continuous circulation of the biphase gas and liquid flow drilling technologies such as atomization, foam, inflation.
Accompanying drawing explanation
Fig. 1 is equipment connection structure schematic diagram of the present invention
Fig. 2 is the circulation guiding pipe nipple structural representation adopted in the present invention
Be labeled as in figure: 1, air injection unit, 2, safety relief mechanism, 3, Liqiud-gas mixing device, 4, gate valve control system, 5, circulation guiding pipe nipple, 6, side circulation canal, 7, nipple body, 8, relief valve, 9, main valve, 10, side valve, 11, major cycle passage, 12, pressure release passage, 13, slush pump, 14, circulating tank.
Detailed description of the invention
Embodiment 1
Be applicable to a continuous cyclic drilling technique for biphase gas and liquid flow drilling well, comprise the Joining Technology of ground installation, connect column or single process and trip-out technique, these technique composition continuous cyclic drilling technique, can be late for a sequencing and implement.
The Joining Technology of described ground installation is: ground installation comprises air injection unit 1, safety relief mechanism 2, Liqiud-gas mixing device 3, gate valve control system 4, connects air injection unit 1, safety relief mechanism 2, Liqiud-gas mixing device 3 and gate valve control system 4 during operation successively; Gate valve control system 4 accesses standpipe by major cycle passage 11, receives rig floor for subsequent use, be connected to circulating tank 14 by pressure release passage 12 by side circulation canal 6;
Describedly connect column or single process is as follows:
A, under get into the end after, in the end first circulation guiding pipe nipple is accessed, major cycle channel connection in a drilling rod top, and gas-liquid two-phase flows through major cycle passage, standpipe enters drilling tool circulation, start normal biphase gas and liquid flow drilling well, column for subsequent use or single top access next circulation guiding pipe nipple;
B, bored column or single after, above carry drilling tool and sit slips or elevator, be connected with first lead side valve of pipe nipple of circulate by side circulation canal, gate valve control system controls side circulation canal unlatching, and gas-liquid two-phase flows through side circulation canal and enters drilling tool and circulate; After side circulating pressure is normal, gate valve control system controls major cycle pathway closure, and pressure release passage is opened, release standpipe pressure;
C, standpipe pressure are after zero, from the pipe nipple top shackle of first circulation guiding, then access column for subsequent use or single;
D, gate valve control system control major cycle passage and open, and gas-liquid two-phase flows through major cycle passage and enters drilling tool circulation, and gate valve control system controls side circulation canal and closes, and pressure release passage is opened, release side circulation canal pressure; Side pipeloop pressure is after zero, dismantles the connection of side valve and side circulation canal, and card taking watt or elevator, recover to creep into;
E, repetition above-mentioned steps, realize the continuous circulation of biphase gas and liquid flow drilling well;
Described trip-out technique is as follows:
A, on carry column or singlely go out turntable surface to lower continuous circulation valve, sit elevator or slips, side circulation canal be connected with first lead side valve of pipe nipple of circulating;
B, gate valve control system control side circulation canal and open, and gas-liquid two-phase flows through survey circulation canal and enters drilling tool circulation, and after side circulation canal pressure is normal, gate valve control system controls major cycle pathway closure, and pressure release passage is opened, and discharges standpipe pressure;
C, standpipe pressure are after zero, shackle, trip out column or single, then are driven on top or kelly bar connects with well head continuous circulation valve;
D, gate valve control system control major cycle passage and open, and side circulation canal is closed, and pressure release passage is opened, release side circulation canal pressure;
When e, side circulation canal pressure are zero, dismantle the connection of side valve and side circulation canal, get elevator or slips, continue to pull out of hole.
In above-mentioned technique, connecing column or single process and trip-out technique needs according to step, implements according to time order and function order.
In the present embodiment, described Liqiud-gas mixing device 3 comprises the inner core for air inlet and the urceolus for feed liquor, gas-liquid mixed interface Liqiud-gas mixing device being provided with the gas injection interface be communicated with inner core, the fluid injection interface be communicated with urceolus and being communicated with urceolus, throughly on inner tube wall be provided with through hole, inner core is communicated with urceolus by through hole, fluid injection interface is connected to slush pump 13 by pipeline, circulating tank 14 is connected to by slush pump 13, gas injection interface is connected to safety relief mechanism 2 by pipeline, and gas-liquid mixed interface is connected to gate valve control system 4.
In the present embodiment, described gate valve control system 4 is arranged between standpipe and Liqiud-gas mixing device 3, comprise major cycle passage gate, side circulation canal gate and pressure release gate, major cycle passage gate is connected to major cycle passage 11, side circulation canal gate is connected to side circulation canal 6, and pressure release gate is connected to pressure release passage 12.
In the present embodiment, described side circulation canal 6 is provided with the pressure monitoring table for monitoring the pressure condition in the circulation canal of side.
In the present embodiment, described circulation guiding pipe nipple 5 is provided with main valve 9, side valve 10 and relief valve 8, main valve 9 is arranged in nipple body 7, and relief valve 8 is arranged on the sidewall of nipple body 7 above main valve 9, and side valve 10 is arranged on the sidewall of nipple body 7 below main valve 9.
In the present embodiment, described main valve 9 is arranged on nipple body 7 center, and coaxial with nipple body 7.
In the present embodiment, described relief valve 8 latus rectum is less than side valve 10 latus rectum.
Embodiment 2
Be applicable to a continuous cyclic drilling technique for biphase gas and liquid flow drilling well, comprise:
The Joining Technology of ground installation is as follows: ground installation comprises air injection unit, safety relief mechanism, Liqiud-gas mixing device, gate valve control system, connects air injection unit successively during operation, safety relief mechanism, Liqiud-gas mixing device, gate valve system.Then major cycle passage access standpipe gate valve control system picked out, to be with manometric side circulation canal to receive rig floor for subsequent use, and pressure release passage is connected to circulating tank.
Connect column (single) technique as follows:
A, under get into the end after in the end drilling rod top access first circulation guiding pipe nipple, major cycle channel connection, gas-liquid two-phase flow through major cycle passage enter standpipe enter drilling tool circulation, start normal biphase gas and liquid flow drilling well, column for subsequent use (single) top access next circulation guiding pipe nipple;
B, bored column (single) after, above carry drilling tool and sit slips or elevator, slowly unload the side outlet side valve cover plate of first circulation guiding pipe nipple, being connected with side valve by side circulation canal, is safety rope; Open gate valve control system side loop control gate, establishment side circulation canal, gas-liquid two-phase flows through survey circulation canal and enters drilling tool circulation.After side circulating pressure is normal, closing gate valve control system major cycle regulating gate, opens pressure release gate, discharges standpipe pressure by pressure release passage;
C, standpipe pressure are after zero, from the pipe nipple top shackle of circulation guiding, then access column for subsequent use (single);
D, open major cycle passage gate by gate valve control system, set up major cycle passage, gas-liquid two-phase flows through major cycle passage and enters drilling tool circulation; Closing gate valve control system side loop control gate, opens pressure release gate, release side circulation canal pressure; Side pipeloop pressure is after zero, separates safety rope, dismantles the connection of side valve and side circulation canal, tighten side valve cover plate; Card taking watt or elevator, recover to creep into;
E, repetition above-mentioned steps, realize the continuous circulation of biphase gas and liquid flow drilling well.
Trip-out technique is as follows:
A, on carry column (single) to lower continuous circulation valve and go out turntable surface, sit elevator or slips;
B, slowly unload first circulation guiding pipe nipple side outlet side valve cover plate, being connected with side valve by side circulation canal, is safety rope;
C, open gate valve control system side loop control gate, establishment side circulation canal, gas-liquid two-phase flows through to be surveyed circulation canal and enters drilling tool circulation; After side circulating pressure is normal, closing gate valve control system major cycle regulating gate, opens pressure release gate, discharges standpipe pressure by pressure release passage;
D, vertical pressure are after zero, shackle, trip out column (single);
E, top are driven (kelly bar) and are connected with well head continuous circulation valve;
F, open gate valve control system major cycle regulating gate, set up major cycle passage, closing gate valve control system side loop control gate, opens pressure release gate, release side circulation canal pressure;
G, side circulation canal pressure are zero, separate safety rope, dismantle the connection of side valve and side circulation canal, tighten side valve cover plate; Get elevator or slips, continue to pull out of hole.
In the present embodiment, described air injection unit comprises: air compressor, supercharger, the equipment of making nitrogen etc., before being connected to safety relief mechanism, for drillng operation provides source of the gas.Air injection unit can adopt air injection unit of the prior art.
In the present embodiment, described safety relief mechanism comprises: bypass valve, stop valve, relief valve, be connected between air injection unit and Liqiud-gas mixing device, the fast shut-off that can (such as build the pressure when there are abnormal conditions, maloperation, down-hole are complicated) injects the gas of gate valve control system, by bypass valve, relief valve pressure release, ensure that the safety of equipment and personnel.Safety relief mechanism can adopt prior art.
In the present embodiment, described Liqiud-gas mixing device comprises: gas injection interface, fluid injection interface, gas-liquid mixed interface, fluid injection interface adopts high-pressure hose or hard tube to be connected to slush pump, gas injection interface adopts high-pressure hose or hard tube to be connected to safety relief mechanism, and gas-liquid mixed interface is connected to gate valve control system.This device can make gas phase, even in liquid phase mix, and reduces or avoid the generation of down-hole slug flow, reduces the risk of drillng operation, improves the safety of biphase gas and liquid flow drillng operation.
In the present embodiment, described gate valve control system comprises major cycle passage gate, side circulation canal gate, pressure release gate, is connected between standpipe and Liqiud-gas mixing device, the switching of controlled circulation passage.
In the present embodiment, its side circulation canal is provided with pressure monitoring table, the pressure condition in the circulation canal of side can be monitored, ensure the safety of operating personnel.
In the present embodiment, its gate valve control system is provided with one and leads to the pressure release passage of circulating tank, when preventing pressure release, pressure is hurted sb.'s feelings, and adds safety.
Embodiment 3
The present embodiment is described the circulation guiding pipe nipple adopted in the present invention.
Circulation guiding pipe nipple comprises: main valve, side valve, relief valve, and main valve is arranged in nipple body, for accessing pipeloop on the sidewall that side valve is arranged on nipple body below main valve.Relief valve is arranged on the sidewall of nipple body above main valve, and in the nipple body of main valve between side valve and relief valve.Described main valve is arranged on nipple body center, and coaxial with nipple body.Described relief valve latus rectum is less than side valve latus rectum.Circulation guiding pipe nipple is connected to when creeping between drilling rod and enters well with drilling tool.
In gas drilling or gas-liquid mixed phase drilling process, in single for the access of circulation guiding pipe nipple, when normally creeping into, gas or gas-liquid mixed communicated nipple body center and main valve circulation, make up a joint or column time, side valve accesses side pipeloop, and by side valve establishment side circulation canal, main valve is closed automatically, the snapping unloaded on open cycle guiding pipe nipple enters single, single connect after, open major cycle passage, main valve open sets up circulation, side valve is closed, and has made up a joint.
When main valve and side valve inefficacy can not normally be opened, Compressed Gas will form trapped pressure between two circulating valves, by the pressure releasing trap in drilling rod that safety relief valve can be safe, subsequent job can be carried out safely.
Embodiment 4
A kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well, the Joining Technology of ground installation is as follows: ground installation comprises air injection unit, safety relief mechanism, Liqiud-gas mixing device, gate valve control system, air injection unit is connected successively during operation, safety relief mechanism, Liqiud-gas mixing device, gate valve system.Then major cycle passage access standpipe gate valve control system picked out, to be with manometric side circulation canal to receive rig floor for subsequent use, and pressure release passage is connected to circulating tank.Before the present invention also comprises gas drilling operation, air injection unit, safety relief mechanism, Liqiud-gas mixing device, gate valve control system are connected successively, then by major cycle passage access standpipe, it is for subsequent use that rig floor received by side circulation canal.
Embodiment 5
Sichuan structure Y well adopts 1.07g/cm
3drilling fluid creep into well depth 673.00m(thunderbolt ways), leakage occurs, and wherein good five subterranean wells leakages are returned.On-the-spot decision adopts the speed-raising of biphase gas and liquid flow continuous cyclic drilling to control leakage.Install air injection unit by ground flow, safety relief mechanism, Liqiud-gas mixing device, gate valve control system, major cycle passage, side circulation canal, pressure release pass through.Under get into the end after, circulation guiding pipe nipple is installed, for subsequent use single on connect next circulation guiding pipe nipple.On-test, air injection unit provides gas injection rate 60m
3/ min, slush pump provides reservoir quantity 45L/s, vertical pressure 7.0MPa when creeping into.Bored single after, on carry drilling tool sit elevator, unload the side valve cover plate on open cycle guiding pipe nipple, connection side circulation canal, the good safety chain of bolt, by gate valve control system open side circulation canal gate, pressure meter on observation side circulation canal, cuts out major cycle passage gate, lays down standpipe pressure by pressure release passage after pressure stability, shackle above circulation guiding pipe nipple, connects for subsequent use single.Connect single rear unlatching major cycle passage gate, close side circulation canal gate after pressure stability, by pressure release passage pressure release, observation side circulating pressure table, unloads side after pressure back to zero and cycles through, and recovers to creep into.Biphase gas and liquid flow continuous cyclic drilling test well section 910.21 ~ 927.15m, makes up a joint in process, and system cloud gray model is steady, and make up a joint front and back maximum pressure fluctuation 0.3MPa, level change 0.4m
3(conventional pneumatic drilling well page fluctuation 20m
3left and right), achieve biphase gas and liquid flow (inflation) drilling well smoothly to make up a joint down-hole continuous circulation in operation, ensure that annular equivalent density is stablized, effectively solve biphase gas and liquid flow (inflation) drilling well make up a joint after the large problem of pressure oscillation, can avoid because annular equivalent density changes the leakage caused, comparatively accurately judge down-hole flooded conditions, improve biphase gas and liquid flow drilling safety.In addition, air-filling well-drilling from making up a joint, turn on pump is approximately 15min(well depth about 900m to the time re-establishing normal circulation), and increase along with well depth, the time can significantly increase, adopt biphase gas and liquid flow continuous cyclic drilling technology then can realize " seamless " to connect, improve air-filling well-drilling efficiency.
Claims (7)
1. be applicable to a continuous cyclic drilling technique for biphase gas and liquid flow drilling well, it is characterized in that: comprise the Joining Technology of ground installation, connect column or single process and trip-out technique;
The Joining Technology of described ground installation is: ground installation comprises air injection unit (1), safety relief mechanism (2), Liqiud-gas mixing device (3), gate valve control system (4), connects air injection unit (1), safety relief mechanism (2), Liqiud-gas mixing device (3) and gate valve control system (4) during operation successively; Gate valve control system (4), by major cycle passage (11) access standpipe, is received rig floor by side circulation canal (6) for subsequent use, is connected to circulating tank (14) by pressure release passage (12);
Describedly connect column or single process is as follows:
A, under get into the end after, in the end first circulation guiding pipe nipple is accessed, major cycle channel connection in a drilling rod top, and gas-liquid two-phase flows through major cycle passage, standpipe enters drilling tool circulation, start normal biphase gas and liquid flow drilling well, column for subsequent use or single top access next circulation guiding pipe nipple;
B, bored column or single after, above carry drilling tool and sit slips or elevator, be connected with first lead side valve of pipe nipple of circulate by side circulation canal, gate valve control system controls side circulation canal unlatching, and gas-liquid two-phase flows through side circulation canal and enters drilling tool and circulate; After side circulating pressure is normal, gate valve control system controls major cycle pathway closure, and pressure release passage is opened, release standpipe pressure;
C, standpipe pressure are after zero, from the pipe nipple top shackle of first circulation guiding, then access column for subsequent use or single;
D, gate valve control system control major cycle passage and open, and gas-liquid two-phase flows through major cycle passage and enters drilling tool circulation, and gate valve control system controls side circulation canal and closes, and pressure release passage is opened, release side circulation canal pressure; Side pipeloop pressure is after zero, dismantles the connection of side valve and side circulation canal, and card taking watt or elevator, recover to creep into;
E, repetition above-mentioned steps, realize the continuous circulation of biphase gas and liquid flow drilling well;
Described trip-out technique is as follows:
A, on carry column or singlely go out turntable surface to lower continuous circulation valve, sit elevator or slips, side circulation canal be connected with first lead side valve of pipe nipple of circulating;
B, gate valve control system control side circulation canal and open, and gas-liquid two-phase flows through survey circulation canal and enters drilling tool circulation, and after side circulation canal pressure is normal, gate valve control system controls major cycle pathway closure, and pressure release passage is opened, and discharges standpipe pressure;
C, standpipe pressure are after zero, shackle, trip out column or single, then are driven on top or kelly bar connects with well head continuous circulation valve;
D, gate valve control system control major cycle passage and open, and side circulation canal is closed, and pressure release passage is opened, release side circulation canal pressure;
When e, side circulation canal pressure are zero, dismantle the connection of side valve and side circulation canal, get elevator or slips, continue to pull out of hole.
2. a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well according to claim 1, it is characterized in that: described Liqiud-gas mixing device (3) comprises the inner core for air inlet and the urceolus for feed liquor, Liqiud-gas mixing device (3) is provided with the gas injection interface be communicated with inner core, the fluid injection interface be communicated with urceolus and the gas-liquid mixed interface be communicated with urceolus, throughly on inner tube wall be provided with through hole, inner core is communicated with urceolus by through hole, fluid injection interface is connected to slush pump (13) by pipeline, circulating tank (14) is connected to by slush pump (13), gas injection interface is connected to safety relief mechanism (2) by pipeline, gas-liquid mixed interface is connected to gate valve control system (4).
3. a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well according to claim 1 and 2, it is characterized in that: described gate valve control system (4) is arranged between standpipe and Liqiud-gas mixing device (3), comprise major cycle passage gate, side circulation canal gate and pressure release gate, major cycle passage gate is connected to major cycle passage (11), side circulation canal gate is connected to side circulation canal (6), and pressure release gate is connected to pressure release passage (12).
4. a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well according to claim 1 and 2, is characterized in that: described side circulation canal (6) is provided with the pressure monitoring table for monitoring the pressure condition in side circulation canal (6).
5. a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well according to claim 1 and 2, it is characterized in that: described circulation guiding pipe nipple (5) is provided with main valve (9), side valve (10) and relief valve (8), main valve (9) is arranged in nipple body (7), relief valve (8) is arranged on the sidewall of main valve (9) top nipple body (7), and side valve (10) is arranged on the sidewall of main valve (9) below nipple body (7).
6. a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well according to claim 5, is characterized in that: described main valve (9) is arranged on nipple body (7) center, and coaxial with nipple body (7).
7. a kind of continuous cyclic drilling technique being applicable to biphase gas and liquid flow drilling well according to claim 5 or 6, is characterized in that: described relief valve (8) latus rectum is less than side valve (10) latus rectum.
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| CN104632110B (en) | 2017-06-09 |
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