WO2006001734A1

WO2006001734A1 - Ejector multipurpose formation tester for horizontal wells and the operating method thereof

Info

Publication number: WO2006001734A1
Application number: PCT/RU2005/000289
Authority: WO
Inventors: Zinoviy Dmitrievich Khomynets
Original assignee: Zinoviy Dmitrievich Khomynets
Priority date: 2004-06-23
Filing date: 2005-05-27
Publication date: 2006-01-05
Also published as: RU2263784C1

Abstract

The invention relates to pumping engineering. The inventive ejector multipurpose formation tester comprises a jet pump (3) which is mounted on a flexible plain pipe (1) and in which body (4) a nozzle (5) and a mixing chamber (6) with a diffuser are arranged. A stepped through channel which is embodied in said body (4) comprises an insert for recording a curve of a formation pressure recovery in a tailpipe space and a blocking insert (19) provided with a return valve (18) mounted in the sidewall the flexible thereof. A mechanical or hydromechanical top packer (2) is arranged on plain pipe (1) below the jet pump (3). A lower packer (11) which i is mounted on the flexible plain pipe (1) below the top packer (2) is made of an flexible material in the form of an open-top cylinder provided t with a conical sidewall, wherein the cylinder bottom is tightly fixed to the flexible plain pipe (1). A ring (13) centring the packer (11) in a casing column (12) is disposed below the lower packer (11) on the flexible plain pipe (1). An autonomous a logging assembly (10) for measuring physical quantities is mounted on the lower perforated end of the flexible plain pipe (1). A distance (L) between the packer (2) and the packer (11) is equal or greater than the external diameter D of the flexible plain pipe (1) where the lower packer is placed.

Description

EJECTOR MULTIFUNCTION PLASTIC TEST FOR HORIZONTAL WELLS

AND WAY OF ITS WORK

Application area

The invention relates to the field of pumping technology, mainly, downhole jet installations for oil production from wells.

State of the art

Known downhole jet installation, including a jet pump installed in a well on a tubing string and a perforator (SU 1146416 Al) located below the jet pump.

This installation allows you to perforate the well and thereby intensify the pumping of various produced media, for example, oil, from the well, however, it does not allow the study of the near-wellbore zone of the reservoirs, which in some cases leads to a decrease in the efficiency of work to intensify the operation of the well, due to the lack of information about how the layers work after perforation. Thus, the efficiency of the well drainage work does not give the expected results. A known method of operation of an ejector formation tester, including the descent into the well of a pipe string with a jet pump, a packer and a radiator with a receiver-converter of physical fields with the latter below the jet pump (RU

2,129,671 Cl).

This method of operation allows pumping various produced media, for example, oil, from the well with simultaneous investigation of the well, while the emitter and receiver-transducer of physical fields are placed with the possibility of reciprocating movement along the axis of the well relative to the jet pump and reservoir, however, in some cases this not enough to get complete information about the condition of the well, which reduces the effectiveness of the work to intensify oil production from the well.

The closest to the invention in terms of technical essence and the achieved result in terms of the device is an ejector multifunctional tester containing a packer with a central channel mounted on a tubing string and an jet pump with an active nozzle, a mixing chamber and a passage with a seat for installing a sealing node with an axial channel, the installation is equipped with a radiator and a receiver-transducer of physical fields located in a sub-packer zone on the input side a jet pump of the medium pumped out of the well and mounted on a wireline cable that is passed through the axial channel of the sealing unit, the outlet of the jet pump is connected to the space surrounding the pipe string, the input of the channel for supplying the pumped medium of the jet pump is connected to the inner cavity of the pipe string below the sealing unit, and the input the channel for supplying a liquid working medium to the active nozzle is connected to the internal cavity of the pipe string above the sealing unit (RU

2121610 Cl).

The well-known downhole jet installation allows for various technological operations in the well below the installation level of the jet pump, including by reducing the pressure drop above and below the sealing unit. However, it allows the study of productive rocks only trunks close to vertical, which narrows the scope of this downhole jet installation. The closest to the invention in technical essence and the achieved result in terms of the method is the method of operation of an ejector multifunctional formation tester, including installing a packer and a jet pump on a pipe string, in the housing of which there is a passage channel with a seat, lowering this assembly into the well, unpacking the packer and placing in the well below the deep-well jet pump (RU 2129672 Cl).

The known method of work of the reservoir tester allows for various technological operations in the well below the installation level of the jet pump, including by creating a pressure differential above and below the sealing unit. However, this method of work of the reservoir tester does not allow to fully use its capabilities, which is associated with a limited set of operations to intensify the influx from the reservoir.

Disclosure of invention

The problem to which the present invention is directed, is the intensification of research and testing of open and cased hole wells, first turn curvilinear or horizontal, optimizing the placement of the packer when working in conjunction with a jet pump and an autonomous logging complex and thereby improving the reliability of the downhole jet installation. This problem in terms of the device is solved due to the fact that the ejector multifunctional formation tester contains a jet pump mounted on a flexible smooth pipe, in the housing of which a nozzle and a mixing chamber with a diffuser are installed, and a stepped passage channel is made, and the latter allows the installation of functional inserts: inserts for registering reservoir pressure recovery curves in the under-packer space and a blocking insert with a check valve in its central passage e and a circulation valve in its side wall, below the jet pump, on a flexible smooth pipe, a mechanical or hydromechanical upper packer is installed for its stationary placement in the unpacked form in the well at a fixed depth, the jet pump is located in the casing above the well formation, below the upper packer at the flexible smooth tube has a lower packer made of elastic material in the form of a glass open from above with a conical side wall, and the bottom of the glass is hermetically fixed but flexible smooth tube, below the lower packer at the flexible smooth pipe arranged centering packers in the casing ring and the bottom perforated end of the flexible smooth pipe installed standalone logging system for measuring physical quantities, such as electrical resistivity of rocks, the distance L between packers is at least the outer diameter D of the flexible smooth pipe at the installation site of the lower packer.

The specified problem in part of the device is also solved due to the fact that through holes can be made in the centering ring.

The specified problem in terms of the device is also solved due to the fact that in the transport position a flexible smooth pipe can be wound on a drum of a winch located on the chassis of a vehicle, for example, a car. This problem, in terms of the method of operation of the ejector multifunctional reservoir tester, is solved by the fact that a jet pump with a stepped passage channel in its casing, a mechanical or hydromechanical upper packer, a lower packer made of elastic material, located below the last on a flexible smooth pipe, is lowered into the well on a flexible smooth pipe and an autonomous logging complex fixed on the lower perforated end of the smooth flexible pipe, and in the stepped passage channel of the jet pump body Lena is a blocking insert with a check valve in its central passage channel and a circulation valve in its side wall, which separates the annular and in-pipe space, during the descent by an autonomous logging complex, the background values of the physical parameters of the borehole zone of the productive formations are recorded, when the specified depth is reached, the upper unpacking is performed packer, then acidic acid is poured from the surface through a smooth flexible pipe through its perforated lower end into the reservoir fracturing solution or fluid, then through the annulus wells, the nozzle of the jet pump and the circulation valve of the blocking insert pump the working fluid, by means of which the blocking insert is washed from the step-by-step channel to the surface and a functional insert is installed in the step-by-step channel to record the reservoir pressure recovery curves in the under-packer space, and the liquid working nozzle is fed into the stream pump nozzle medium and create a depression in the sub-packer space of the well on the reservoir, the product is pumped out of the reservoir you have a reaction or hydraulic fracturing fluid and measure well flow rates at 2-3 depressions per formation, abruptly stop the flow of liquid working medium into the jet pump nozzle and record the reservoir pressure recovery curve in the under-packer space by an autonomous logging complex, depacker the upper packer, and again supply the liquid working medium into the nozzle of the jet pump, thus causing the unpacking of the lower packer, then when the jet pump is running, the flexible smooth pipe is lifted with ore and logging the physical fields of rocks along the wellbore in the zone of the reservoir, and after passing through the zone of the reservoir, the flow of liquid working medium into the nozzle of the jet pump is stopped and depacking of the lower packer is carried out, after which the smooth flexible pipe is lifted with equipment installed on it to the surface.

The specified problem in terms of the method of operation of the ejector multifunctional reservoir tester is also solved due to the fact that the descent and ascent of a flexible smooth pipe with installed on equipment can be carried out by means of a winch, the drum of which is mounted on a vehicle, for example, a car.

An analysis of the operation of the ejector multifunctional formation tester showed that the reliability of the installation can be improved both by optimally positioning the jet pump in the well relative to other structural elements of the installation with equipment placed on a flexible smooth pipe, and by performing installation with two packers, one of which is mechanical or hydromechanical, and the other is located below, made of elastic material and equipped with a centering casing located below it on a flexible smooth pipe olonna ring.

It was found that the above location of the jet pump in the well allows the most efficient use of equipment that is installed on a flexible smooth pipe when conducting research and testing of productive rock formations, while creating conditions for obtaining complete and reliable information about the state of the productive formation . The installation allows you to create a number of different depressions using a jet pump with a given pressure drop, and using a functional insert to record the reservoir pressure recovery curves and an autonomous logging complex, a well is investigated and tested. At the same time, it is possible to control the magnitude of depression by controlling the rate of pumping of the liquid working medium. During formation testing, the pumping mode can be adjusted by changing the pressure liquid working fluid supplied to the nozzle of the jet pump. During testing, the use of two packers can improve the reliability of the information received. It was found that it is advisable to record the curves of reservoir pressure recovery and drainage of the formation with an unpacked mechanical or hydromechanical packer, and formation logging in the depressed mode when the mechanical or hydromechanical upper packer is in the transport position. In this case, the separation of the space of the well is carried out by means of a lower packer of elastic material. This is due to the fact that the fixed position of the structural elements of the installation allows to reduce the error when taking the hydrodynamic characteristics of the well, and the separation of the space of the well using a packer of elastic material allows dynamic formation testing, and it is possible during these studies to move the jet pump relative to the well together with autonomous logging complex. Carrying out a variety of comprehensive studies has allowed to expand the amount of information obtained during one descent of the installation into the well. However, it was found that it is more rational to place a packer of elastic material below a mechanical or hydromechanical packer. In this case, the load on the packer of elastic material is reduced while creating maximum pressure drops on the packer. At the same time, to exclude the influence of a mechanical or hydromechanical packer on the operation of a packer made of elastic material, the latter should be located below the mechanical or hydromechanical packer at a distance that is not less than the external diameter of the flexible smooth pipe on which the packers are installed.

It is possible to install a jet pump and other functional inserts in a stepped passage channel, in particular, a blocking insert with a check valve in its central passage channel and a circulation valve in its side wall. Overlapping with a blocking insert of both the channel for supplying a liquid working medium and the channel for supplying the medium pumped out of the well during separation of the annular and in-annular space of the well prevents foreign objects from entering the jet pump that can clog the jet pump, which also improves the reliability of the installation . It is possible to carry out a functional insert for recording reservoir pressure recovery curves with a non-return valve and a bypass valve, which can further improve the accuracy of the data obtained when registering the above curves, which, in turn, allows for better processing of the well and its preparation for operation, as well as allows to speed up and simplify the process of pressure equalization between the sub-packer and over-packer space of the well. Placing the circulation valve in the side wall of the blocking insert under the check valve simplifies the process of changing the inserts in the stepped passage channel of the jet pump and rejects any fishing devices. Thus, this jet well installation has wide functional capabilities, which allows for comprehensive qualitative research and testing of wells after drilling or during overhaul in various modes. During the study, it was found that to ensure reliable operation of the lower packer made of elastic material and to ensure the possibility of moving the jet pump and autonomous logging complex in the well without depacking the packer from elastic material, the latter is made of elastic material in the form of a glass with conical walls. The centering ring located below this packer fixes the flexible smooth pipe in the casing and does not create significant hydraulic resistance when lowering and lifting the equipment on the flexible smooth pipe. In the end, it was possible to obtain comprehensive objective information about the state of productive rocks of the reservoir.

In the transport position, a flexible smooth pipe can be wound on a drum of a winch located on the chassis of a vehicle, for example, a car, which allows you to accelerate installation of the installation, as well as lowering and lifting equipment.

Thus, the above set of interdependent parameters ensures the achievement of the objective of the invention — the intensification of research and testing of curved and horizontal wells with open and cased bore in the zone of the reservoir, as well as optimizing the work of packers when they work in conjunction with a jet pump and an autonomous logging complex and, due to this, improving the reliability of the ejector multifunctional formation tester.

Brief Description of the Drawings

Figure l shows a longitudinal section of an ejector multifunctional tester with a blocking insert. And FIG. 2 shows a longitudinal section of an ejector multifunctional formation tester with a functional insert installed to record formation pressure recovery curves.

The best embodiment of the invention

The proposed ejector multifunctional formation tester for implementing the described method comprises a mechanical or hydromechanical upper packer 2 mounted on a flexible smooth pipe 1, a jet pump 3, in the housing 4 of which a nozzle 5 and a mixing chamber 6 with a diffuser 7 are installed, as well as a stepped passage channel 8 and a channel 17 supply of a pumped medium. Functional inserts can be installed in the stepped passage channel 8, in particular, a functional insert 9 for recording reservoir pressure recovery curves, as well as a blocking insert 19, with a check valve 18 in its passage channel and a circulation valve 16 in its side wall. Below the upper packer 2, on the flexible smooth pipe 1, the lower packer 11 is made of elastic material and an autonomous logging complex 10 is fixed on the perforated end of the flexible smooth pipe 1, which allows measuring physical quantities, for example, electrical resistivity of rocks and injecting them into the formation 20 various kinds of liquids.

The jet pump 3 is installed in the casing 12 above the reservoir. Below the lower packer 11, on the flexible smooth pipe 1, a centering packer 11 is located in the casing 12 of the ring 13. In the centering ring 13 there are made through

SUBSTITUTE SHEET (RULE 26) holes 14, and the lower perforated end of the pipe 1 above the autonomous logging complex 10 is formed by holes 15.

The lower packer 11 is made of elastic material in the form of a glass open from above with a cone-shaped side wall. The bottom of the glass is hermetically fixed to a flexible smooth pipe 1. Distance

L between the packers 2 and 11 is at least the outer diameter D of the flexible smooth pipe 1 at the installation location of the lower packer 11.

The proposed method of operation of an ejector multifunctional reservoir tester for horizontal wells is as follows.

A jet pump 3 is lowered into the well on a flexible smooth pipe 1 with a step-by-pass passage 8 in its body 4 and a blocking insert 19 with a check valve 18 installed in the step-by-pass passage 8, a mechanical or hydromechanical upper packer 2 located below the jet pump 3, an additional lower packer 11 of an elastic material and mounted on the lower perforated end of the flexible smooth pipe 1 autonomous logging complex 10. In the descent process by means of the autonomous logging complex 10 the background values of the physical parameters of the borehole zone of the productive strata 20. When the specified depth is reached, the upper packer 2 is unpacked. Then, through the perforated lower end, the smooth packer pipe 1 is injected into the reservoir 20 an acid solution or hydraulic fracturing fluid, and then through the annulus of the well, nozzle 5 of the jet pump 3 and the circulation valve 16 in the side wall of the blocking insert 19 under its check valve 18

SUBSTITUTE SHEET (RULE 26) the working fluid is pumped into the flexible smooth pipe 1, by means of which the blocking insert 19 is washed from the stepped passage channel 8 to the surface and a functional insert 9 is installed in the stepped passage channel to record formation pressure recovery curves in the under-packer space. In the latter, a bypass valve can be installed, and below the functional insert 9, a non-return valve and an autonomous pressure gauge can be installed. Next, a liquid working medium is fed into the nozzle 5 of the jet pump 3 and a depression is created in the sub-packer space of the well on the reservoir 20, reaction products or hydraulic fracture are pumped out from the reservoir 20 and the flow rates of the well are measured at 2-3 depressions on the reservoir 20, the flow is abruptly stopped liquid working medium into the nozzle 5 of the jet pump 3 and register the reservoir pressure recovery curve by an autonomous logging complex 10. Then, the upper packer 2 is depacked and the liquid working medium is again supplied to the nozzle about 5 of the jet pump 3. This leads to an increase in the pressure in the annulus of the pipe 1 above the lower packer 11 of elastic material and its automatic unpacking due to the pressure of the liquid column on the side walls of the elastic cup of the packer 11 and their pressing against the wall of the casing string 12, while the lower packer 11 is installed above the studied reservoir 20. Next, when the jet pump 3 is running, a flexible smooth pipe 1 is lifted with equipment installed on it and physical rock fields are recorded along the wellbore in the zone of the reservoir 20. After the passage of the zone of the reservoir 20 by an autonomous logging complex 10, the flow is stopped

SUBSTITUTE SHEET (RULE 26) liquid working medium into the nozzle 5 of the jet pump 3, which leads to pressure equalization above and below the lower packer 11 due to the flow of fluid from the annulus through the nozzle 5 and the channel 17 for supplying the pumped medium into the under-packer space. At the same time, due to pressure equalization in the flexible smooth pipe 1 above and below the lower packer 11, it is depacked, and then the smooth flexible pipe 1 with the equipment installed on it is lifted to the surface.

INDUSTRIAL APPLICABILITY The present invention may find application in the oil industry for testing and developing oil and gas horizontal and curved wells at the stages of their drilling and production, as well as in other industries where various media are produced from wells.

SUBSTITUTE SHEET (RULE 26)

Claims

Claim

1. An ejector multifunctional formation tester, comprising a jet pump mounted on a flexible smooth pipe, in the housing of which a nozzle and a mixing chamber with a diffuser are installed, and a step-through passage is made, and the latter provides the possibility of installing functional inserts: inserts for recording pressure recovery curves in the under-packer space and the blocking insert with a check valve in its central passageway and a circulation valve in its side wall, below the jets On the flexible smooth pipe, a mechanical or hydromechanical upper packer is installed for its fixed placement in the unpacked form in the well at a fixed depth, the jet pump is located in the casing above the reservoir, below the upper packer on the flexible smooth pipe there is a lower packer made of flexible material in the form of a glass open from above with a cone-shaped side wall, the glass bottom being hermetically fixed to a flexible smooth pipe, under the lower packer on a flexible h there is a ring for the packers in the casing, and an autonomous logging system is installed at the lower perforated end of the flexible smooth pipe for measuring physical quantities, for example, the electrical resistivity of rocks, with the distance L between the packers is at least the outer diameter D of the flexible smooth pipe at the installation location of the lower packer.

2. The multi-functional reservoir tester according to claim 1, characterized in that through holes are made in the centering ring.

Z. Ejector multifunctional reservoir tester according to claim 1, characterized in that in the transport position a flexible smooth pipe is wound on a drum of a winch located on the chassis of a vehicle, for example, a car.

4. The method of operation of the ejector multifunctional formation tester, namely, that a jet pump with a step-through passage in its casing, a mechanical or hydromechanical upper packer, a lower packer of elastic material and fixed, located below the last on a flexible smooth pipe, is lowered into the well on a flexible smooth pipe on the lower perforated end of the smooth flexible pipe there is an autonomous logging complex, and a blocking insert is installed in the stepped passage channel of the jet pump body with a check valve in its central passage channel and a circulation valve in its side wall, during descent by an autonomous logging complex, the background values of the physical parameters of the near-well zone of the productive formations are recorded, when the specified depth is reached, the upper packer is unpacked, then through a smooth flexible pipe through its perforated the lower end is injected into the reservoir, an acid solution or hydraulic fracturing fluid, and then through the annulus of the well, the nozzle is jet of circulation pump and valve blocking insert pumped working fluid, by means of which a blocking insert is washed out from the stepped bore channel onto the surface and a functional insert is installed in the stepped bore channel to register formation pressure recovery curves in the under-packer space, a liquid working medium is fed into the jet pump nozzle and create a depression in the under-packer well space to the reservoir , reaction products or fracturing fluid are pumped out of the reservoir and the well flow rates are measured at 2-3 depressions and onto the formation, the flow of liquid working medium into the nozzle of the jet pump is abruptly stopped and the formation pressure recovery curve in the under-packer space is recorded by an autonomous logging complex, the upper packer is decompressed, the liquid working medium is again fed into the jet pump nozzle, thus causing unpacking of the lower packer, then when the jet pump is operating, a flexible smooth pipe with the equipment installed on it is lifted and the physical fields of the mountains are recorded with an autonomous logging complex s rock along the borehole into a producing formation zone, and after passage of the producing formation zone stopping supplying the liquid working medium of the jet pump nozzle and thus carried depakerovku lower packer, after which lifting is performed with a smooth flexible tube mounted thereon to the surface equipment.

5. The method of work according to claim 2, characterized in that the descent and ascent of a flexible smooth pipe with equipment installed on it is carried out by means of a winch, the drum of which is mounted on a vehicle, for example, a car.