CN113464124A - Oil well shallow layer leakage finding device - Google Patents

Abstract

The invention discloses a leakage finding device for a shallow layer of an oil well, and relates to the technical field of oil exploitation. The packer comprises a pipe column, wherein a centering assembly, a pressurizing flow controller, a first packer, a telescopic pipe set, a second packer, an oil pipe anchor and a ball seat are sequentially arranged in the pipe column from top to bottom, and a partition assembly is arranged between the telescopic pipe set and the second packer. The centering assembly is coaxially fixed on the oil well mouth, so that the pipe column and the leakage finding device can descend along the central axis of the oil well, the friction between the leakage finding device and the wall of the oil well pipe is prevented, the device is prevented from being abraded, the shearing ring is pushed to move upwards to shear the shearing pin in a hydraulic pushing mode, the damage to equipment is reduced while the leakage finding device can stably operate, and the steel mesh rubber tube adopts a structural design of a double-layer polyvinyl chloride material and a steel mesh, so that the pressure resistance, the sealing reliability and the service life of the steel mesh rubber tube are improved.

Description

Oil well shallow layer leakage finding device

Technical Field

The invention relates to the technical field of oil exploitation, in particular to a leakage finding device for a shallow layer of an oil well.

Background

The production of oil (water) well is based on the well, and the perfect well body structure is the basic condition for ensuring the normal production of oil (water) well. In recent years, with the continuous extension of the development cycle of each oil field, the application of various measures for increasing the production and injection, the electrochemical corrosion of well fluid and the like causes the leakage and the corrosive perforation of the casing pipe to different degrees. Not only influences the output, but also causes great difficulty for the construction of finding leakage, plugging and the like in the later period, and the outstanding problem is the determination of the leakage point. The conventional leakage finding measure of the prior operation is that firstly, single sealing is firstly carried out to determine an upper leakage point; secondly, determining a lower leakage point by a lower double seal; and finally, checking whether a leakage point exists above the oil layer by lower clamping seal. The whole process needs to be matched with cement truck construction, the average duration is more than 70h, and the improvement of the operation timeliness is seriously influenced.

Chinese patent publication No. CN106522930A discloses a leakage detection device for oil well pipe wall, comprising: the oil well pipe wall leakage finding device comprises a first connecting portion, a first packer, a disconnecting device, a second connecting portion and a second packer, wherein one end of the first connecting portion is connected with one end of the second connecting portion through the disconnecting device, the other end of the first connecting portion is used for connecting a pipe column, the first connecting portion is of a hollow structure, the first packer is arranged on the first connecting portion, the second packer is arranged on the second connecting portion, and the disconnecting device is used for disconnecting the first connecting portion and the second connecting portion after the oil well pipe wall leakage finding device is placed at a preset position in a well through the pipe column. The invention realizes that the leakage point can be found by one-time downhole operation of the leakage finding device for the oil well pipe wall through the pipe column, thereby reducing the leakage finding time and improving the leakage finding efficiency.

However, the following problems still exist in the prior art:

(1) when entering an oil well, the leakage finding device needs to be lowered through a lifting appliance, the position of the lifting appliance is difficult to ensure to be coaxial with the oil well, and corresponding equipment is not used for centering and fixing the leakage finding device, so that the leakage finding device is easy to rub against the wall of an oil well pipe, and the device is abraded;

(2) the distance between two packers needs flexible pipe usually to be adjusted, and when need open flexible pipe, generally need rotatory tubular column, cuts the fixed pin under the effect of torque force, however this kind of cutting mode operation is inconvenient, can be cut for guaranteeing the fixed pin, needs great torque force, will cause the damage to equipment like this to there is certain distance in the position that the device often is leaked with ground, rotates long distance's tubular column, is difficult to guarantee the working effect.

Disclosure of Invention

The invention aims to provide a leakage detection device for a shallow layer of an oil well, which aims to solve the technical problem in the prior art.

The invention provides an oil well shallow layer leakage finding device, which comprises a pipe column, wherein a pressurizing throttleer, a first packer, a telescopic pipe group, a second packer, an oil pipe anchor and a ball seat are sequentially arranged in the pipe column from top to bottom, a partition component is arranged between the telescopic pipe group and the second packer, a centering component is sleeved outside the pipe column and is positioned above the pressurizing throttleer, the centering component comprises a sleeve, three connecting rods, a sleeve ring, a base, a shell, a first gear, three first sliding blocks, three second sliding blocks, a motor and a second gear, the sleeve is coaxially sleeved on the pipe column and is in sliding connection with the pipe column, the three connecting rods are circumferentially arranged, one end of each connecting rod is fixedly connected with the sleeve, the sleeve ring is coaxially arranged outside the sleeve, and the sleeve ring is connected with the sleeve through the three connecting rods, the base is fixedly connected with the bottom of the sleeve, three first sliding grooves are formed in the base, the shell is arranged above the base, three second sliding grooves are formed in the shell, the first gear is coaxially sleeved on the sleeve, racks are arranged on the inner sides of the three first sliding blocks, the racks on the first sliding blocks are meshed with the first gear, each first sliding block is in sliding fit with the base through the corresponding first sliding groove, inclined sliding rails are arranged at the tops of the three first sliding blocks, each second sliding block is in sliding fit with the corresponding first sliding block through the sliding rails, each second sliding block is in sliding fit with the shell through the corresponding second sliding groove, a rubber pad is arranged at one end, away from the sleeve, of each second sliding block, the motor is arranged above the shell, and the second gear is coaxially sleeved on a main shaft of the motor, and the second gear is meshed with the first gear.

Further, the pressure boost flow controller includes valve cover joint, valve, adjustable ring, pressure boost spring and first center tube, the coaxial setting of first center tube is in the tubular column, the lower part at first center tube is established to valve cover joint cover, the top fixed connection of valve and valve cover joint, the upper portion at first center tube is established to the adjustable ring cover, the adjustable ring passes through pressure boost spring with the valve and is connected.

Further, all be provided with first top connection, packing element seat, second center tube, steel mesh packing element and first lower clutch in first packer and the second packer, the coaxial setting of second center tube is in the tubular column, first top connection cover is established on the upper portion of second center tube, the bottom fixed connection of packing element seat and first top connection, first lower clutch cover is established in the lower part of second center tube, steel mesh packing element sets up between packing element seat and first lower clutch, set up the pipeline that communicates the two between steel mesh packing element and the second center tube.

Further, the telescopic pipe group comprises a second upper joint, an inner telescopic pipe, a shearing pin, a stopping hoop, a sealing ring, an outer telescopic pipe and a second lower joint, wherein the outer telescopic pipe is coaxially arranged in the pipe column, the inner telescopic pipe is coaxially arranged in the outer telescopic pipe, the bottom of the inner telescopic pipe is fixedly arranged on the sealing ring, the inner telescopic pipe is in sliding fit with the outer telescopic pipe, the upper part of the outer telescopic pipe is arranged on the second upper joint sleeve, the stopping hoop is arranged below the second upper joint and is fixedly connected with the inner telescopic pipe, the shearing pin is fixedly arranged between the outer telescopic pipe and the stopping hoop, and the bottom of the inner telescopic pipe is arranged under the second head sleeve.

Further, cut off the first transfer line that the subassembly includes L shape, second transfer line, elastic piston, spring and shearing ring, the second transfer line sets up outside the expansion tube with the shearing ring, the bottom of first transfer line is connected with the top of the steel mesh packing element on the second packer, the second transfer line sets up the one end at first transfer line, elastic piston sets up the juncture at first transfer line and second transfer line, the one end of spring and the end-to-end connection of first transfer line, the other end and the elastic piston of spring are connected, the shearing ring slides and sets up in second transfer line upper end mouth of pipe department, just the shearing ring is located the below of shearing the pin.

Further, the tubing anchor includes third top connection, third center tube, casing, a plurality of friction righting piece and a plurality of anchor tooth, the coaxial setting of third center tube is in the tubular column, the upper portion at the third center tube is established to the third top connection cover, the casing set up in the outside of third center tube and with the bottom fixed connection of third top connection, a plurality of friction righting piece is the circumference and sets up on the outer wall of third center tube, a plurality of the anchor tooth is the same and the one-to-one with a plurality of friction righting piece quantity, every the one end of anchor tooth all contradicts with the friction righting piece that corresponds, every the anchor tooth all sets up in the casing and with casing sliding fit.

Further, the ball seat is fixedly connected with the bottom of the pipe column, and a pipeline is arranged on the ball seat.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, the pipe column is coaxially fixed on the oil well mouth through the centering assembly, and in the process of descending the pipe column and the leakage finding device, the pipe column and the leakage finding device can descend along the central axis of the oil well through the centering assembly, so that the leakage finding device is prevented from rubbing against the wall of the oil well pipe to cause abrasion of the device, and the structure is simple and easy to realize;

(2) according to the partition assembly, the shear pin is sheared in a hydraulic pushing mode, and compared with the mode that the shear pin is twisted off by rotating and depending on torque force in the prior art, the partition assembly is higher in stability and smaller in influence on the whole equipment;

(3) the shearing pin can not be sheared when the steel mesh rubber barrel of the second packer is not expanded to the limit state, so that the subsequent work of stretching the tubular column can be carried out only after the second packer is in the packing state, the leakage finding device can stably run, meanwhile, the damage to equipment is reduced, the working efficiency is improved, and the working effect is ensured;

(4) the steel mesh rubber tube adopts the structural design of the double-layer polyvinyl chloride and steel mesh, so that the pressure resistance, the sealing reliability and the service life of the steel mesh rubber tube are greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a front view of the present invention;

FIG. 2 is a first partial schematic of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 1;

FIG. 4 is an enlarged view at B in FIG. 2;

FIG. 5 is an enlarged view at C of FIG. 2;

FIG. 6 is a second partial structural view of the present invention;

FIG. 7 is an enlarged view taken at D in FIG. 6;

FIG. 8 is a perspective view of the centering assembly;

FIG. 9 is a partial schematic structural view of the centering assembly;

FIG. 10 is a partial schematic structural view of a tubing anchor;

fig. 11 is a schematic view of the internal structure of the steel mesh packing rubber cylinder.

Reference numerals:

1. a pipe string; 2. a centering assembly; 3. a pressurizing restrictor; 4. a first packer; 5. a telescopic pipe group; 6. a second packer; 7. tubing anchor; 8. a ball seat; 9. a partition assembly; 21. a sleeve; 22. a connecting rod; 23. a collar; 24. a base; 25. a housing; 26. a first gear; 27. a first slider; 28. a second slider; 29. a motor; 211. a second gear; 212. a rubber pad; 31. a valve cover joint; 32. a valve; 33. an adjusting ring; 34. a pressurizing spring; 35. a first center tube; 41. a first upper joint; 42. a rubber cylinder seat; 43. a second center tube; 44. a steel mesh rubber cylinder; 45. a first lower joint; 46. a pipeline; 51. a second upper joint; 52. an inner telescopic pipe; 53. shearing the pin; 54. a backstop hoop; 55. a seal ring; 56. extending the pipe outwards; 57. a second lower joint; 71. a third upper joint; 72. a third center tube; 73. a housing; 74. rubbing the righting block; 75. anchoring teeth; 91. a first infusion tube; 92. a second infusion tube; 93. an elastic piston; 94. a shear ring; 95. a spring.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 11, an embodiment of the present invention provides an oil well shallow layer leak finding device, including a pipe string 1, a pressurized choke 3, a first packer 4, a telescopic pipe group 5, a second packer 6, a tubing anchor 7 and a ball seat 8 are sequentially arranged in the pipe string 1 from top to bottom, a partition assembly 9 is arranged between the telescopic pipe group 5 and the second packer 6, a centering assembly 2 is sleeved outside the pipe string 1, the centering assembly 2 is located above the pressurized choke 3, the centering assembly 2 includes a casing 21, three connecting rods 22, a sleeve ring 23, a base 24, an outer shell 25, a first gear 26, three first sliding blocks 27, three second sliding blocks 28, a motor 29 and a second gear 211, the casing 21 is coaxially sleeved on the pipe string 1, the casing 21 is slidably connected with the pipe string 1, the three connecting rods 22 are circumferentially arranged, one end of each connecting rod 22 is fixedly connected with the sleeve 21, the lantern ring 23 is coaxially arranged outside the sleeve 21, the lantern ring 23 is connected with the sleeve 21 through three connecting rods 22, the base 24 is fixedly connected with the bottom of the sleeve 21, the base 24 is provided with three first sliding grooves, the shell 25 is arranged above the base 24, the shell 25 is provided with three second sliding grooves, the first gear 26 is coaxially sleeved on the sleeve 21, the inner sides of the three first sliding blocks 27 are provided with racks, the racks on each first sliding block are engaged with the first gear 26, each first sliding block 27 is in sliding fit with the base 24 through the corresponding first sliding groove, the tops of the three first sliding blocks 27 are provided with inclined sliding rails, and each second sliding block 28 is in sliding fit with the corresponding first sliding block 27 through the sliding rails, each second sliding block 28 is in sliding fit with the housing 25 through a corresponding second sliding groove, a rubber pad 212 is arranged at one end, away from the sleeve 21, of each second sliding block 28, the motor 29 is arranged above the housing 25, the second gear 211 is coaxially sleeved on a main shaft of the motor 29, and the second gear 211 is meshed with the first gear 26. When the leakage finding device descends from an oil well mouth, firstly, the sleeve ring 23 is fixed on the outer wall of the oil well mouth, then the motor 29 is started, the main shaft of the motor 29 rotates, so that the second gear 211 is driven to rotate, the first gear 26 is driven to rotate through the engagement of the second gear 211 and the first gear 26, the racks on each first sliding block 27 are all engaged with the first gear 26, the first sliding blocks 27 are driven to slide, the second sliding blocks 28 are driven to slide through the matching of sliding rails, the rubber pads 212 are pushed out and abutted against the inner wall of the oil well mouth, the oil well mouth is clamped and fixed through the rubber pads 212 and the sleeve ring 23, the centering assembly 2 is coaxially fixed on the oil well mouth, the tubular column 1 and the leakage finding device can descend along the central axis of the oil well, the friction between the leakage finding device and the wall of the oil well pipe is prevented, the abrasion of the device is caused, the structure is simple, and the realization is easy.

Specifically, the pressurized restrictor 3 includes a valve cover joint 31, a valve 32, an adjusting ring 33, a pressurized spring 34 and a first center tube 35, the first center tube 35 is coaxially disposed in the tubular column 1, the valve cover joint 31 is disposed on the lower portion of the first center tube 35, the valve 32 is fixedly connected to the top of the valve cover joint 31, the adjusting ring 33 is disposed on the upper portion of the first center tube 35, and the adjusting ring 33 is connected to the valve 32 through the pressurized spring 34. When the hydraulic pipe is used, hydraulic pressure is applied to the pipe column 1, the hydraulic pressure acts on the valve 32 through the first central pipe 35, the valve 32 compresses the pressurizing spring 34, when the pressure exceeds 2.5MPa, the valve 32 is opened, and high-pressure liquid flow is injected into a stratum.

Specifically, all be provided with first top connection 41, packing element seat 42, second center tube 43, steel mesh packing element 44 and first lower clutch 45 in first packer 4 and the second packer 6, the coaxial setting of second center tube 43 is in tubular column 1, first top connection 41 cover is established on the upper portion of second center tube 43, packing element seat 42 and the bottom fixed connection of first top connection 41, first lower clutch 45 cover is established in the lower part of second center tube 43, steel mesh packing element 44 sets up between packing element seat 42 and first lower clutch 45, set up the pipeline 46 that communicates the two between steel mesh packing element 44 and the second center tube 43. When first packer 4 and second packer 6 are opened to needs, in the input 38mm steel ball, the liquid stream gets into the annular space between second center tube 43 and the steel mesh packing element 44 this moment, when pressure differential reaches design pressure differential 2.5Mpa, steel mesh packing element 44 expands and the laminating of oil well inner wall, and steel mesh packing element 44 adopts the structural design of double-deck polyvinyl chloride fluorine ethylene material with the steel mesh, the pressure-resisting capability of steel mesh packing element 44 has been improved greatly, sealing reliability and life.

Specifically, the telescopic pipe group 5 comprises a second upper joint 51, an inner telescopic pipe 52, a shearing pin 53, a stopping hoop 54, a sealing ring 55, an outer telescopic pipe 56 and a second lower joint 57, wherein the outer telescopic pipe 56 is coaxially arranged in the pipe column 1, the inner telescopic pipe 52 is coaxially arranged in the outer telescopic pipe 56, the sealing ring 55 is fixedly arranged at the bottom of the inner telescopic pipe 52, the inner telescopic pipe 52 is in sliding fit with the outer telescopic pipe 56, the second upper joint 51 is sleeved on the upper portion of the outer telescopic pipe 56, the stopping hoop 54 is arranged below the second upper joint 51 and is fixedly connected with the inner telescopic pipe 52, the shearing pin 53 is fixedly arranged between the outer telescopic pipe 56 and the stopping hoop 54, and the second lower joint 57 is sleeved at the bottom of the inner telescopic pipe 52. When the telescopic pipe group 5 needs to be opened, the shearing pin 53 is sheared, at the moment, the inner telescopic pipe 52 is lifted up to stretch the telescopic pipe group 5 to a working state, and single-sealing and double-sealing conversion and shallow layer quick leakage finding work are completed by matching with other leakage finding tools.

Specifically, cut off subassembly 9 and include first transfer line 91, second transfer line 92, elastic piston 93, spring 95 and the shear ring 94 of L-shaped, second transfer line 92 and shear ring 94 set up in outer telescopic tube 56, the bottom of first transfer line 91 is connected with the top of steel mesh packing element 44 on the second packer 6, second transfer line 92 sets up the one end at first transfer line 91, elastic piston 93 sets up the juncture at first transfer line 91 and second transfer line 92, the one end of spring 95 and the end-to-end connection of first transfer line 91, the other end and the elastic piston of spring 95 are connected, shear ring 94 slides and sets up in second transfer line 92 upper end mouth of pipe department, just shear ring 94 is located the below of shearing pin 53. When the second packer 6 is activated, the fluid flow enters the annular space between the second center tube 43 and the steel mesh packing element 44 of the second packer 6, part of the fluid flow enters the first infusion tube 91, due to the arrangement of the elastic piston 93 and the spring 95, when the spring 95 does not reach the design differential pressure of 2.5MPa, the elastic piston 93 can not deform, the channel between the first transfusion tube 91 and the second transfusion tube 92 can be continuously blocked, when the pressure difference reaches the design pressure difference of 2.5Mpa, the steel mesh rubber tube 44 expands to be attached to the inner wall of the oil well, and the liquid flow in the steel mesh rubber tube 44 of the second packer 6 continues to enter the first infusion tube 91 after the steel mesh rubber tube 44 expands to the limit state, and pushes the elastic piston 93 to one end of the first infusion tube 91, then the liquid flow enters the second liquid conveying pipe 92 and moves upwards, the shearing ring 94 is pushed to move upwards to shear the shearing pin 53, the shear pin 53 is sheared by hydraulically pushing the shear ring 94 upward.

Specifically, the tubing anchor 7 includes a third top sub 71, a third center tube 72, a housing 73, a plurality of friction centralizing blocks 74 and a plurality of anchor teeth 75, the third center tube 72 is coaxially disposed in the tubular string 1, the third top sub 71 is sleeved on the upper portion of the third center tube 72, the housing 73 is disposed on the outer side of the third center tube 72 and is fixedly connected to the bottom of the third top sub 71, the friction centralizing blocks 74 are circumferentially disposed on the outer wall of the third center tube 72, the anchor teeth 75 are identical in number and correspond to the friction centralizing blocks 74 one by one, one end of each anchor tooth 75 is abutted to the corresponding friction centralizing block 74, and each anchor tooth 75 is disposed in the housing 73 and is in sliding fit with the housing 73. When the telescopic pipe group 5 needs to be opened, the pipe column 1 is rotated clockwise, the friction centralizing block 74 rotates at the moment and pushes out the anchor teeth 75 in a butting mode to be radially anchored on the inner wall of an oil well, and the telescopic pipe group 5 is stretched, single-seal and double-seal conversion and shallow layer quick leakage finding work are completed in a matching mode.

Specifically, the bottom fixed connection of ball seat 8 and tubular column 1, just seted up the pipeline on the ball seat 8, in 38mm steel ball forms airtight space through the bottom that the pipeline fell into tubular column 1, guarantees to look for the stability of neglected loading.

The working principle is as follows: when the leakage finding device descends from an oil well mouth, firstly, the lantern ring 23 is fixed on the outer wall of the oil well mouth, then the motor 29 is started, the main shaft of the motor 29 rotates to drive the second gear 211 sleeved on the main shaft to rotate, the first gear 26 is driven to rotate through the meshing of the second gear 211 and the first gear 26, the racks on each first sliding block 27 are all meshed with the first gear 26 to drive the first sliding blocks 27 to slide, the second sliding blocks 28 are driven to slide through the matching of the sliding rails, so that the rubber pads 212 are pushed out and abut against the inner wall of the oil well mouth, the oil well mouth is clamped and fixed through the rubber pads 212 and the lantern ring 23, the centering assembly 2 is coaxially fixed on the oil well mouth, the tubular column 1 and the leakage finding device can descend along the central axis of the oil well, the friction between the leakage finding device and the wall of the oil well pipe is prevented, the abrasion of the device is caused, the structure is simple and easy to realize, and then the tubular column 1 is lowered to the depth required by design, when seeking the upper bound of the casing leakage section, the first packer 4 does not work, the liquid flow is expanded after entering the second packer 6, after the liquid flow is filled in the pipe column 1, the hydraulic pressure rises to the position of the pressurization throttler 3 in the pipe column 1 and acts on the valve 32, the valve 32 compresses the pressurization spring 34 to enable the liquid flow to leave the valve cover joint 31, the valve 32 is opened, the liquid is injected into the stratum by the side wall of the pressurization throttler 3 to find leakage, if the external liquid level of the pipe column 1 continuously rises, the upper bound of the casing leakage section is not found, then the liquid in the pipe column 1 is extracted, the second packer 6 is contracted, the pipe column 1 is continuously lowered to find leakage, and the leakage finding process is carried out for many times, if the external liquid level of the pipe column 1 does not rise any more, then the leakage finding of the upper bound of the casing leakage section is completed. After the upper bound of the casing leakage section is found, leakage is found for the lower bound of the casing leakage section, the pipe column 1 continuously descends, the pipe column is thrown in to a steel ball 38mm, the first packer 4 is opened to enable the first packer to work, at the moment, liquid flow enters an annular space between the second central pipe 43 of the second packer 6 and the steel mesh rubber tube 44, partial liquid flow can enter the first liquid conveying pipe 91, due to the arrangement of the elastic piston 93 and the spring 95, the spring 95 cannot deform when the design pressure difference is not reached to 2.5Mpa, the elastic piston 93 continuously blocks a channel between the first liquid conveying pipe 91 and the second liquid conveying pipe 92, when the design pressure difference is reached to 2.5Mpa, the steel mesh rubber tube 44 expands to be attached to the inner wall of an oil well, and the liquid flow in the steel mesh rubber tube 44 of the second packer 6 continues to enter the first liquid conveying pipe 91 after the steel mesh rubber tube 44 expands to be in a limit state, and the elastic piston 93 is pushed to one end of the first liquid conveying pipe 91, then the liquid flow enters the second liquid conveying pipe 92 and moves upwards to push the shearing ring 94 to move upwards to shear the shearing pin 53, the shearing ring 94 is pushed to move upwards to shear the shearing pin 53 in a hydraulic pushing mode, and the conveyed liquid is to expand the steel mesh rubber tube 44 of the second packer 6 and then enter the first liquid conveying pipe 91, so that the second packer 6 is always in a packing state, the shearing pin 53 is prevented from being sheared when the steel mesh rubber tube 44 of the second packer 6 is not expanded to a limit state, the leakage detection device can stably operate, meanwhile, the damage to equipment is reduced, the working efficiency is improved, the working effect is ensured, then the pipe column 1 is slowly lifted, the telescopic pipe group 5 is pulled open, the pressure is continuously pressed according to the design requirement, the first packer 4 is opened according to the same working principle as the second packer 6, the leakage detection is carried out on the lower boundary of the leakage detection section through the same working principle as the upper boundary of the leakage detection section, the whole leakage finding process is completed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A shallow leakage finding device for an oil well comprises a pipe column (1), wherein a pressurizing restrictor (3), a first packer (4), a telescopic pipe group (5), a second packer (6), an oil pipe anchor (7) and a ball seat (8) are sequentially arranged in the pipe column (1) from top to bottom, a partition component (9) is arranged between the telescopic pipe group (5) and the second packer (6), a centering component (2) is sleeved outside the pipe column (1), the centering component (2) is positioned above the pressurizing restrictor (3), the centering component (2) comprises a sleeve (21), three connecting rods (22), a sleeve ring (23), a base (24), a shell (25), a first gear (26), three first sliding blocks (27), three second sliding blocks (28), a motor (29) and a second gear (211), the sleeve (21) is coaxially sleeved on the pipe column (1), the sleeve (21) is connected with the pipe column (1) in a sliding manner, the three connecting rods (22) are arranged in a circumferential manner, one end of each connecting rod (22) is fixedly connected with the sleeve (21), the lantern ring (23) is coaxially arranged outside the sleeve (21), the lantern ring (23) is connected with the sleeve (21) through the three connecting rods (22), the base (24) is fixedly connected with the bottom of the sleeve (21), the base (24) is provided with three first sliding grooves, the shell (25) is arranged above the base (24), the shell (25) is provided with three second sliding grooves, the first gear (26) is coaxially sleeved on the sleeve (21), the inner sides of the three first sliding blocks (27) are provided with racks, the racks on each first sliding block are meshed with the first gear (26), and each first sliding block (27) is in sliding fit with the base (24) through the corresponding first sliding groove, the top of first slider (27) all is provided with the slide rail of slope, every second slider (28) all through slide rail and first slider (27) sliding fit that corresponds, and every second slider (28) all through corresponding second spout and shell (25) sliding fit, every the one end that sleeve pipe (21) were kept away from in second slider (28) all is provided with rubber pad (212), motor (29) set up the top at shell (25), coaxial cover of second gear (211) is established on the main shaft of motor (29), just second gear (211) and first gear (26) meshing.

2. The oil well shallow layer leakage detection device as claimed in claim 1, characterized in that the pressurized choke (3) comprises a valve cover joint (31), a valve (32), an adjusting ring (33), a pressurized spring (34) and a first central tube (35), the first central tube (35) is coaxially arranged in the pipe column (1), the valve cover joint (31) is sleeved on the lower portion of the first central tube (35), the valve (32) is fixedly connected with the top of the valve cover joint (31), the adjusting ring (33) is sleeved on the upper portion of the first central tube (35), and the adjusting ring (33) is connected with the valve (32) through the pressurized spring (34).

3. The oil well shallow layer leakage detection device as claimed in claim 1, characterized in that a first upper joint (41), a rubber cylinder seat (42), a second central pipe (43), a steel mesh rubber cylinder (44) and a first lower joint (45) are arranged in each of the first packer (4) and the second packer (6), the second central pipe (43) is coaxially arranged in the pipe column (1), the first upper joint (41) is sleeved on the upper part of the second central pipe (43), the rubber cylinder seat (42) is fixedly connected with the bottom of the first upper joint (41), the first lower joint (45) is sleeved at the lower part of the second central pipe (43), the steel mesh rubber sleeve (44) is arranged between the rubber sleeve seat (42) and the first lower joint (45), and a pipeline (46) for communicating the steel mesh rubber tube (44) and the second central tube (43) is arranged between the steel mesh rubber tube and the second central tube.

4. The oil well shallow layer leakage detection device as claimed in claim 1, characterized in that the telescopic pipe group (5) comprises a second upper joint (51), an inner telescopic pipe (52), a shearing pin (53), a stopping hoop (54), a sealing ring (55), an outer telescopic pipe (56) and a second lower joint (57), the outer telescopic pipe (56) is coaxially arranged in the pipe column (1), the inner telescopic pipe (52) is coaxially arranged in the outer telescopic pipe (56), the sealing ring (55) is fixedly arranged at the bottom of the inner telescopic pipe (52), the inner telescopic pipe (52) is in sliding fit with the outer telescopic pipe (56), the second upper joint (51) is sleeved on the upper part of the outer telescopic pipe (56), the stopping hoop (54) is arranged below the second upper joint (51) and fixedly connected with the inner telescopic pipe (52), the shearing pin (53) is fixedly arranged between the outer telescopic pipe (56) and the stopping hoop (54), the second lower joint (57) is sleeved at the bottom of the inner telescopic pipe (52).

5. The oil well shallow layer leakage detection device according to claim 4, wherein the partition component (9) comprises an L-shaped first infusion tube (91), a second infusion tube (92), an elastic piston (93), a spring (95) and a shear ring (94), the second infusion tube (92) and the shear ring (94) are arranged in the outer telescopic tube (56), the bottom of the first infusion tube (91) is connected with the top of a steel mesh rubber tube (44) on the second packer (6), the second infusion tube (92) is arranged at one end of the first infusion tube (91), the elastic piston (93) is arranged at the junction of the first infusion tube (91) and the second infusion tube (92), one end of the spring (95) is connected with the tail end of the first infusion tube (91), the other end of the spring (95) is connected with the elastic piston, and the shear ring (94) is slidably arranged at a tube orifice at the upper end of the second infusion tube (92), and the shear ring (94) is located below the shear pin (53).

6. The oil well shallow layer leakage detection device as claimed in claim 1, characterized in that the tubing anchor (7) comprises a third upper joint (71), a third central pipe (72), a housing (73), a plurality of friction centralizing blocks (74) and a plurality of anchor teeth (75), the third central pipe (72) is coaxially arranged in the tubing string (1), the third upper joint (71) is sleeved on the upper portion of the third central pipe (72), the housing (73) is arranged on the outer side of the third central pipe (72) and fixedly connected with the bottom of the third upper joint (71), the plurality of friction centralizing blocks (74) are circumferentially arranged on the outer wall of the third central pipe (72), the number of anchor teeth (75) is the same as the number of the friction centralizing blocks (74) and corresponds to one another, one end of each anchor tooth (75) is abutted against the corresponding friction centralizing block (74), each anchor tooth (75) is arranged in the shell (73) and is in sliding fit with the shell (73).

7. The oil well shallow layer leakage detection device as claimed in claim 1, characterized in that the ball seat (8) is fixedly connected with the bottom of the pipe column (1), and the ball seat (8) is provided with a pipeline.

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