WO2016008339A1

WO2016008339A1 - Drill-free stage collar of through-bottom type

Info

Publication number: WO2016008339A1
Application number: PCT/CN2015/080602
Authority: WO
Inventors: 赵锦栋; 高勇; 姜平; 罗中梁
Original assignee: 深圳市百勤石油技术有限公司
Priority date: 2014-07-14
Filing date: 2015-06-02
Publication date: 2016-01-21
Also published as: CN204098850U

Abstract

A drill-free stage collar of through-bottom type comprises an upper joint (1), a lower joint (20) and an outer barrel (2). A circulation hole (201) is arranged in the outer barrel (2), and a barrel-shaped closing sleeve (9) is arranged inside the outer barrel (2). A closing plug seat (4) and an opening plug seat (19) are sequentially arranged from the upper joint (1) to the lower joint (20) in the closing sleeve (9). A first steel ball (10) passes through the closing sleeve (9) to be clamped between the closing plug seat (4) and a groove in the outer barrel (2). The opening plug seat (19) is fixedly connected with the closing sleeve (9) through an opening shear pin (15). The closing plug seat (4) is provided with a release groove (401), and the first ball (10) can be pushed into the release groove (401). A step-shaped transition part (191) is provided at an end of the opening plug seat (19), the end being close to the lower joint (20). A steel ball (17) passing through the closing sleeve (9) is arranged between the step-shaped transition part (191) and the outer barrel (2). A receiving groove (21) is provided in the barrel (2). Hence, during the movement of the opening plug seat (19) towards the lower joint (20), the step-shaped transition part (191) can push the steel ball (17) into the receiving groove (21). At the same time, the closing sleeve (9) is locked by a clamping spring (18) at a part of the outer barrel (2), the part being close to the lower joint (20). An inner sleeve does not need to be drilled and removed, and a full-size drift diameter can also be reserved in the stage collar.

Description

Title of the invention: a through-hole type drill-free graded hoop

Technical field

[0001] The present invention relates to a graded cementing device for use in oil field grading cementing, and more particularly to a bottomless, drill-free grading hoop.

Background technique

[0002] Cementing is a construction process in which a casing is directed into the well and cement is injected into the annular space between the wellbore and the casing, which is an important operation in the drilling process. At least two cementing (production wells) and up to 4-5 cementing (deep exploration wells) are required in drilling operations. The top cementing is cemented with a surface casing, which acts as a “mud passage, oil and gas portal”. Before the next drilling, a blowout preventer should be installed on the surface casing to prevent blowout. A mud pipe is installed above the blowout preventer, which is a passage for the drilling fluid to return to the mud pool. In the drilling process, it is often necessary to cement the technical casing, which plays the role of "consolidating the rear and safely exploring the road". Like tunnels in roads and roadways in coal mines, wells, high pressures and unstable formations are encountered during the drilling process. The same is also for the purpose of "rescue" in the case of distress in the forward "pathway". The role.

[0003] In the cementing operation, some special working conditions are often encountered. For example, if the amount of cement injected once is too large, the formation cannot withstand excessive liquid column pressure, and a special layer needs to be sealed to prevent air enthalpy after cementing. The temperature difference between the upper and lower sides of the sealing section makes the performance of the cement slurry difficult to adjust, etc., and the double-stage cementing of the inclined well and the horizontal well is required for the concrete. In order to meet these special construction requirements and characteristics, graded hoops have been promoted and widely used. However, conventional grade hoops are mainly mechanical and hydraulic. The existing two types of grading hoops need to be cleaned and drilled after the cementing. In the process of sweeping and drilling accessories, the grading hoop will be damaged to some extent, and severe grading will occur. The hoop can not be completely shut down, affecting subsequent production and production measures, and the plugging will increase the single well construction cycle and cost.

technical problem

[0004] In order to solve the above technical problems, the present invention provides a through-bottom type drill-free grading hoop that does not need to be drilled out of the inner sleeve, and can avoid damage to the grading hoop during the drilling plug and the attachment of the attachment.

Problem solution

Technical solution [0005] The technical solution adopted by the present invention to solve the above technical problem is: a bottom-through type drill-free grading hoop, comprising an outer cylinder, the outer cylinder is provided with an upper joint at one end and a lower joint at the other end, a circulation hole is further disposed on the outer cylinder, and a cylindrical closing sleeve is disposed in the outer cylinder, and the closing sleeve is provided with a hole corresponding to the circulation hole, and the sealing sleeve is provided in the closing sleeve Between the upper joint and the lower joint, a closing plug and a smashing seat are sequentially disposed; a first steel ball and a smashing shearing nail are further disposed, and the first steel ball penetrates the closing sleeve to be stuck in the Between the closing plug and the groove on the outer cylinder; the cocking seat is fixedly connected to the closing sleeve by the smashing nail; the closing plug is provided with a release groove into which the first steel ball falls.

[0006] With respect to the above-described through-hole type drill-free grading hoop, as a further arrangement, the end of the smashing seat adjacent to the lower joint is provided with a step-like transition, in the step-like transition and the a steel ball penetrating the closing sleeve is disposed between the outer cylinders, and the outer cylinder is provided with a receiving groove capable of accommodating the steel ball; and, the closing plug seat is fixed at the closing by closing the shearing nail a portion of the closing plug that is adjacent to the upper joint is exposed to the closing sleeve, and a sleeve is disposed between the portion of the closing plug that is exposed to the closing sleeve and the outer cylinder, the sleeve The ring is secured to the closure plug by a detachment shear.

[0007] For the above-mentioned one-bottom type drill-free grading hoop, as an alternative, a circlip for locking the closing sleeve is further provided at the end of the outer cylinder, and the circlip setting is Between the receiving groove and the lower joint.

[0008] With respect to the above-described through-hole type drill-free grading hoop, as a further arrangement, a first seal ring is further disposed between the upper joint and the outer cylinder.

[0009] With respect to the above-described through-hole type drill-free grading hoop, as a further arrangement, a second sealing ring is disposed between the closing sleeve and the outer cylinder, and the closing plug is A third sealing ring is disposed between the closing sleeves.

Advantageous effects of the invention

Beneficial effect

[0010] The use of the through-bottom type drill-free grading hoop of the present invention has the following beneficial effects: Due to the use of the steel ball limit and support technology, for example, the first steel ball is used to close the sleeve and close the plug seat for limiting and bearing Supporting, using the steel ball to limit and support the closing sleeve and the smashing seat, the design is simple, reasonable and highly reliable, and the detachable shearing nail is used to close the plug seat to make a short squat, and the snoring nail is used for snoring. The plug seat is short-cut, and it is snoring. After the plug is cut by the smashing nail, it can move under the pressure in the downward joint direction until it is blocked by the steel ball; after the shearing shear is cut, the plug and the cocking seat are moved to the lower end. When the closing sleeve moves to the step of the upper end of the lower joint to stop descending, the groove on the plug seat and the outer cylinder is closed to release the limitation of the first steel ball and the steel ball, and after the shearing nail is cut, the plug and the plug are finally closed. The seat is combined under pressure and removed from the outer cylinder. This shedding design allows the closing plug and the slamming seat to automatically break free of the grading hoop after applying pressure to the grading hoop, and the structure is designed to match the specific part size. It is possible to avoid the closing of the plug seat and the tamping seat in advance, and the structure of the present invention not only effectively avoids the plug (no need to drill) and drills the attachment as compared with the conventional grading hoop which needs to drill the inner sleeve. The damage caused to the grading hoop in the process also leaves the full-size path, does not affect the subsequent production measures, meets the on-site production requirements, and its unique limit and self-locking design can be confirmed. Grading hoop play Jian, Guan maintained, shut prison.

Brief description of the drawing

DRAWINGS

1 is a schematic structural view of a through-bottom type drill-free grading hoop according to the present invention;

2 is a schematic structural view of a closing plug of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The technical solutions in the embodiments of the present invention will be clearly described in conjunction with the drawings in the embodiments of the present invention, and the described embodiments will be clearly described. Examples are some embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

[0014] A bottom-through type drill-free grading hoop, as shown in FIG. 1, includes an outer cylinder 2, the outer cylinder 2 is provided with a circulation hole 201, an upper joint 1 is provided at one end of the outer cylinder 2, and the other end is provided with a lower end A joint 20 for connecting the present invention to other components. In production, the upper joint 1 and the lower joint 20 may be directly connected to the sleeve, wherein the upper joint 1 has a transition portion (not shown), and the transition portion passes through the top portion. The wire 3 is fixed on the outer cylinder 2, and a first sealing ring 5 is disposed between the transition portion and the outer cylinder 2; inside the outer cylinder 2, a closing plug 4 and a snoring are sequentially provided from the upper joint 1 to the lower joint 20 The plug seat 19 is provided with a closing sleeve 9 between the closing plug 4 and the outer cylinder 2, and the closing sleeve 9 is closed The first steel ball 10 is supported, and the first steel ball 10 penetrates the closing sleeve 9 and is caught between the groove on the outer cylinder 2 and the outer wall of the closing plug 4, and a release groove 401 is further disposed on the closing plug seat 4, In the process of closing the relative movement of the plug seat 4 and the outer cylinder 2, the first steel ball 10 can be placed between the release groove 401 and the groove on the outer cylinder 2, so that the first steel ball 10 is released and will follow The closing plug 4 and the closing sleeve 9 are moved together; at the end of the outer cylinder 2, a retaining spring 18 for locking the closing sleeve 9 is further disposed, and the retaining spring 18 is located between the receiving recess 21 and the lower joint 20, The final circlip 18 will permanently lock the closure sleeve, after which the circulation hole 201 is permanently closed by the closure sleeve 9.

[0015] In the present invention, an inwardly contracting transition step may also be provided on the lower joint 20, the step being vertically retractable radially inwardly for further restricting the movement of the closing sleeve 9, when the closing sleeve 9 is descended down to At the transition step of the joint 20, the transition step pushes it against it so that it cannot continue to move downward.

[0016] The closing plug 4 is fixed on the closing sleeve by closing the shearing nail 8. When the closing shearing nail 8 is cut, closing the plug 4 can get rid of the restriction of closing the shearing nail 8; the closing plug 4 is partially exposed Closing sleeve 9, a portion of the closing plug 4 exposed to the closing sleeve 9 and the outer cylinder 2 is provided with a collar 6 which is fixed to the closing plug 4 by a falling shearing nail 7 The collar 6 is fixed to the closing plug 4 by the detaching shearing nail 7. When the detaching shearing nail ₇ is cut, the plug 4 is closed and detached from the collar 6.

[0017] The closing sleeve 9 is provided with a hole (not shown) corresponding to the circulation hole 201 of the outer cylinder 2, and in a normal state, the hole on the closing sleeve 9 corresponds to the circulation hole 201, and both of them It is closed under the action of the slamming seat 19 and the sealing ring.

[0018] A plurality of sealing rings are further disposed between the closing sleeve 9 and the outer cylinder 2, between the closing sleeve 9 and the closing plug seat 4, such as the second sealing ring 11 and the third sealing ring 12 as shown in FIG. The fourth sealing ring 13 and the fifth sealing ring 14 and the like are further provided with a smashing nail 15 on the closing sleeve 9, and the smashing seat 19 is fixed on the closing sleeve 9 by the smashing nail 15 and the smashing seat 19 can apply pressure on the outside and cut the smashing nail 15 to get rid of the limitation of the snoring nail 15.

[0019] The end of the smashing block 19 near the outer cylinder 2 has a stepped transition 191 which is vertically and radially inwardly contracted, and the steel ball 17 penetrates the closing sleeve 9 and is caught in the stepped transition 191 and the outer cylinder 2 Between the inner walls and the inner side, a receiving groove 21 is further provided on the lower joint 20 for restricting the movement of the steel ball 17, and the steel ball 17 is caught inside, and the closing sleeve 9 is positioned at the same time; The seat 19 can push the steel ball 17 to move in the direction of the lower joint 20 through the stepped transition 191, and finally push the steel ball 17 into the receiving groove 21, so that the steel ball 17 and the smashing seat 1 9 is disengaged and no longer acts on it. After the steel ball 17 is caught in the accommodating recess 21, the portion exposed to the accommodating recess 21 is used to support the closing sleeve 9.

[0020] The internal space of the snoring seat 19 has a certain contraction so that the inside thereof can fall into the copper ball 16 吋, and the copper ball 16 can be left in the snoring seat 19.

[0021] A through-bottom type drill-free grading hoop (hereinafter referred to as a grading hoop) is used in combination with other devices to form a completion string, and in the cementing kiln, the mud is fully circulated to make it suitable for cementing. It is required to ensure that the wellbore is clean and unobstructed, adjust the mud to suit the cementing requirements and ensure the safety and stability of the well wall. Then check whether there are any debris in the classification hoop, and check whether the accessories are matched and the rubber plug is intact. If there is no problem, combine the grading hoop with other parts to make the tube string. The recommended tube string is arranged as: 引鞋+筛管串10 blind slab ball seat ten tube outer packer ten casing ten-level hoop ten sets The pipe string is connected with the cement head, and then the pipe string is placed in the wellbore, and the circulating mud is rinsed. Then, the copper ball matched with the blind ball seat on the pipe string is put into the hole, and the pressure is pressed to a certain extent (for example 7MP or 9MP, the specific pressure value can be adjusted according to the production needs) and maintain a certain time (for example, 2min or 3min, the specific time can be adjusted according to actual production needs), increase the packer, and then press to a certain extent (such as 12MP, the specific pressure value can be adjusted according to production needs) 憋 off the ball seat; cast the copper ball 16 matched with the smashing seat 19, then pressurize the grading hoop, smash the circulation hole 201, establish circulation, adjust the mud, Then close the plug (as shown in Figure 2) into the cement head, and then carry out the cementing operation. After the cement is finished, release the closing plug, replace it, pay close attention to the grading hoop pressure gauge pointer, and the pressure should be the grading hoop closing pressure. (For example, 5MPa, the specific pressure value can be adjusted according to production needs) and the sum of the cycle pressures. The pressure gauge pointer should be displayed as a rapid rise and then lowered. It is judged that the internal structure of the grading hoop and the blind plate is detached, and then the smashing prevention gate is used to check the closing effect. Finally, the cement head and the pipeline are unloaded, and the whole operation process is completed.

[0022] In the above process, the action mechanism of the grading hoop is as follows. When the string is in place, it is circulated as required. After the copper ball 16 is put into the grading hoop, the copper ball 16 falls into the smashing seat 19, Thereafter, pressure is applied to the grading hoop so that the smashing shear pin 15 is sheared, and the smashing plug 19 is moved downward until the stepped transition 191 of the tamping seat 19 stops under the blocking action of the steel ball 17, The circulation hole 201 is completely smashed; the circulation process begins, after the end of the circulation process, after the cement is finished, the closure plug is released, and the cement slurry in the casing is displaced, and when the closing plug is closed and the plug 4 is closed, the grading is continued. Pressurizing, closing the plug seat 4, driving the collar 6 down by the peeling shear nails 7, until the plug seat 4 is closed against the slamming plug seat 19, and at the same time, closing the release on the plug seat 4 The groove 401 descends to the first steel ball 10 such that the first steel ball 10 partially enters the outer groove 401, which relieves the restriction of closing the plug 4 and the outer cylinder 2 to the first steel ball 10, so that the closing The plug, the closing plug 4, the collar 6, the closing sleeve 9 and the slamming block 19 move downward together until the closing sleeve 9 descends to the lower joint 20, and the step on the lower joint 20 blocks the closing sleeve 9, the spring 18 When it is permanently locked, the steel ball 17 is moved into the accommodating recess 21 so that the steel ball 17 partially enters the accommodating recess 21, thus disengaging the definition of the smashing plug 19 of the steel ball 17, and The circulation hole 201 is also permanently closed by the closing sleeve 9, and thereafter, due to the pressure, the closing plug and the closing plug 4 continue to descend and cut off the shearing nail 7, breaking away from the restriction of the collar 6, and then under the action of pressure, Closing the plug 4 and the slamming block 19 continues downwards, eventually falling into the bottom of the well under pressure.

[0023] It can be seen from the above process that the inner sleeve of the grading hoop of the present invention does not need to be drilled, that is, the plug 4 and the slamming block 19 are not required to be drilled, and the outer tube 2, the closing sleeve 9 and the steel ball are relied upon. The structural relationship between 17 and so on can be self-shedding under pressure, and the full-size diameter is left, no need to drill separately, which greatly saves the daytime and production cost, and the same will not affect the follow-up. The production measures can meet the on-site production requirements very well. The invention has the following beneficial effects: 1. Drill-free, the grading hoop body does not need to be drilled; 2. After the grading hoop peeling shears are cut, the plug is closed, the plug is closed, and the plug is closed. When the weight is increased, the probability of falling into the bottom of the well is greatly increased; 3. Effectively preventing early falling off; 4. Simple design, reasonable and high reliability; 5. Saving construction period and saving Well construction costs.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, and the scope of the knowledge of those skilled in the art may be used without departing from the scope of the present invention. Make various changes.

Claims

Claim

The utility model relates to a bottom-through type drill-free grading hoop, which comprises an outer cylinder (2), the outer cylinder (2) has an upper joint (1) at one end and a lower joint (20) at the other end, and the outer cylinder (2) There is further provided a circulation hole (201), characterized in that: a cylindrical closing sleeve (9) is arranged in the outer cylinder (2), and the closing sleeve (9) is provided with the a corresponding hole of the circulation hole (201), in which the closing plug (4) and the smashing seat are sequentially arranged from the upper joint (1) to the lower joint (20) in the closing sleeve (9) 19); further comprising a first steel ball (10) and a smashing shear pin (15), wherein the first steel ball (10) penetrates the closing sleeve (9) and is caught in the closing plug ( 4) between the groove on the outer cylinder (2); the smashing seat

(19) fixedly connected to the closing sleeve (9) by the smashing nail (15); the closing plug (4) is provided to enable the first steel ball (10) to fall Into the release groove (401).

A through-hole type drill-free grading hoop according to claim 1, wherein: the smashing seat (19) is provided with a step-like transition (191) near one end of the lower joint (20). Between the stepped transition (191) and the outer cylinder (2), a steel ball (17) penetrating the closing sleeve (9) is provided, and the outer cylinder (2) is provided with a casing The steel ball (17) accommodates the groove (21).

A through-hole, drill-free grading hoop according to claim 2, wherein: said closing plug (4) is fixed to said closing sleeve (9) by closing the shearing pin (8).

A through-hole type drill-free grading hoop according to claim 2, wherein: a portion of the closing plug seat (4) adjacent to the upper joint (1) is exposed to the closing sleeve (9), a closing collar (4) is provided with a collar ( ₆ ) between the portion exposed to the closing sleeve (9) and the outer cylinder (2), and the collar (6) passes through the shearing nail (7) It is fixed on the closing plug (4).

A through-hole type drill-free grading hoop according to claim 3 or 4, characterized in that: at the end of the outer cylinder (2), a circlip (18) for locking the closing sleeve (9) is further provided. The circlip (18) is disposed between the receiving groove (21) and the lower joint (20). [Claim 6] A through-hole type drill-free grading hoop according to claim 1, characterized in that: between the upper joint (1) and the outer cylinder (2) a sealing ring (5).

[Claim 7] A through-hole type drill-free grading hoop according to claim 1, characterized in that: a second is provided between the closing sleeve ( ₉ ) and the outer cylinder (2) a sealing ring (11), a third sealing ring (12) is disposed between the closing plug seat (4) and the closing sleeve (9)