A downhole pipe rod coupling detection and positioning device for well repair operations

Abstract

The present invention discloses a downhole pipe-rod coupling detection and positioning device used in well repair operations in the petroleum industry. The device of the present invention is provided with a housing and an elastic body. The elastic body wound with a winding wire is installed in the housing. The free end of the winding wire passes through the shell wall of the housing and passes through the seal and the reset spring installed in the displacement conduction installation mechanism and then is connected to the displacement output end. As long as the retraction amount of the winding wire is available, the intelligent control of the traveling block hook can be realized through the processing of the intelligent well repair system program, which greatly reduces the labor intensity of the operator, and at the same time protects the equipment and devices installed at the wellhead, avoiding the adverse consequences and economic losses caused by the forced lifting of the pipe-rod coupling. The present invention has a reasonable design, a simple structure, and a low manufacturing cost. The passing information of the pipe-rod coupling provided has a high accuracy rate, which solves the problem that has long plagued intelligent well repair. It has a significant use effect and can achieve significant economic and social benefits.

Description

Technical Field

[0001] The invention relates to an auxiliary device for a downhole rod column and a downhole pipe column detection device in a well repairing operation in the petroleum industry, in particular to a downhole pipe rod coupling detection and positioning device for a well repairing operation. Background Art

[0002] In the process of automated well repair, since the length of each sucker rod or each tubing in the well is different, when the tubing or sucker rod is lowered, the coupling is above the wellhead, and the traveling block hook can be directly positioned; however, when the tubing or sucker rod is pulled out, since the coupling of the tubing or sucker rod is in the well, the driller cannot see the coupling position of the tubing or sucker rod. Therefore, the driller needs to predict the time of pulling out the tubing or sucker rod coupling from the wellhead based on field experience, and must always keep an eye on the wellhead, which makes it impossible to achieve intelligent control of the traveling block hook. The inability to achieve intelligent control of the traveling block hook has become an obstacle to the development of intelligent well repair.

[0003] During the well repair operation of oil, water and gas wells under pressure, when the pipe rod is lifted, when the coupling is close to the semi-closed BOP group, there are generally two semi-closed BOPs. The upper semi-closed BOP must be closed first, and then the lower semi-closed BOP is opened, so that the coupling passes through the lower semi-closed BOP first and is lifted between the upper and lower semi-closed BOPs, and then the lower semi-closed BOP is closed and the upper semi-closed BOP is opened to lift the pipe rod under pressure. If the pipe rod coupling scrapes against the sealing rubber core inside the BOP during the construction process, it will cause serious damage to the rubber core, affect the service life of the BOP, and even cause serious accidents such as blowouts; the process of lowering the oil pipe and the sucker rod is the same as above. The accurate positioning of the pipe rod coupling also hinders the automation and intelligent development of the well repair operation construction of oil, water and gas wells under pressure.

[0004] Therefore, it is very important to accurately determine the position of the tubing and rod couplings for well repair operations.

[0005] At present, the devices for detecting the position of pipe rod couplings are generally mechanical, ultrasonic, and electromagnetic. Among them, the mechanical type is mostly roller contact type, for example: the patent technology with patent number 201010234477.8, the basic principle is to measure the diameter difference of the pipe rod coupling relative to the body. This mechanical pipe rod coupling detection device has high requirements for the centering of the pipe rod coupling and has a complex structure. The ultrasonic and electromagnetic devices for detecting the position of pipe rod couplings need to be compared and analyzed through a large number of intermediate equipment and instruments before the coupling position can be detected, and the accuracy of the detection is greatly affected by the conditions in the well. Summary of the invention

[0006] The purpose of the present invention is to provide a downhole pipe coupling detection and positioning device for well repair operations, which overcomes the problems of complex detection structure, multiple intermediate equipment and poor reliability in the above-mentioned background technology, and provides reliable pipe coupling passing instructions for intelligent well repair.

[0007] The technical solution of the present invention is achieved by the following methods:

[0008] A downhole pipe rod coupling detection and positioning device for well repair operations is provided with a shell and an elastic body. The elastic body wound with a winding wire is installed in the shell. The free end of the winding wire passes through the shell wall of the shell and passes through a seal and a reset spring installed in a displacement conduction installation mechanism, and then is connected to a displacement output end.

[0009] The overall shape of the elastic body is an I-shape, and a winding wire clamping groove is provided in the middle. The depth and width of the winding wire clamping groove are consistent with the shape and winding turns of the winding wire.

[0010] A pressure balancing hole is provided in the main body of the elastic body below the winding wire clamping groove, and the number of the pressure balancing holes is set between 1 and 30.

[0011] There is no pressure balancing hole in the main body of the elastic body below the winding wire clamping groove.

[0012] The displacement conduction installation mechanism is provided with a sealing connection box and a spring installation sleeve. The sealing connection box is threadedly connected or plugged with the spring installation sleeve. A sealing member is installed in the sealing connection box. A reset spring and a displacement output end are installed in the spring installation sleeve. The free end of the winding wire passes through the sealing member of the sealing connection box and the reset spring in the spring installation sleeve and is connected to the displacement output end.

[0013] The shell is generally I-shaped with flanges at both ends, bolt holes are provided in the flanges at both ends, a winding wire passing hole or a sealing connection box passing hole is provided in the shell wall of the shell, or two winding wire passing holes or two sealing connection box passing holes are provided in the shell wall of the shell.

[0014] The root of the sealing connection box can be inserted into the sealing connection box through hole of the shell and then welded to the shell outside the shell; the root of the sealing connection box can be directly welded to the outer position of the winding wire through hole of the shell.

[0015] The displacement output end 6 is provided with a detection device connector and a retaining ring, in which a winding wire passing hole is provided, the outer diameter of the retaining ring is smaller than the inner diameter of the spring mounting sleeve, the outer diameter of the detection device connector is larger than the inner diameter of the winding wire passing hole in the retaining ring, the free end of the winding wire passes through the retaining ring and is connected to the detection device connector in the displacement output end, and the detection device connector is connected to the pipe rod coupling displacement detection device in the intelligent well repair system through a cable.

[0016] The winding wire is provided with two free ends or one free end. When the winding wire is provided with one free end connected to the detection device connector in the displacement output end, the other end of the winding wire is a fixed end, which is fixed in the fixed ear plate, and the fixed ear plate is welded to the inner wall of the shell.

[0017] The fixed end of the winding wire can be wound back from the fixing ear plate and then bound or fixed in a fixing bolt in the fixing ear plate.

[0018] The inner diameter of the elastic body after being wound by the winding wire is smaller than the outer diameter of the pipe rod coupling; the number of winding turns of the winding wire in the elastic body is set between 1 turn and 30 turns.

[0019] The downhole pipe rod coupling detection and positioning device is installed at a position above the wellhead spool of the working well.

[0020] Compared with the prior art, the remarkable use effect of the present invention is as follows: the present invention is used in conventional well repair operations and is installed at a position above the wellhead four-way. When the pipe-rod coupling passes through the elastic body wrapped by the winding wire, the tightened inner cavity of the elastic body expands, pulling the winding wire to retract it. The winding wire provides accurate passing information of the pipe-rod coupling for the displacement detection device of the pipe-rod coupling connected to the intelligent well repair system. As long as the retraction amount of the winding wire is known, the intelligent control of the traveling block hook can be realized through the processing of the intelligent well repair system program, which greatly reduces the labor intensity of the operator. The present invention is used in the well repair construction process of pressurized oil, water and gas wells. It can autonomously control the switch of the blowout preventer according to the passing information of the pipe-rod coupling, protect the equipment and devices installed at the wellhead, and avoid the adverse consequences and economic losses caused by the forced lifting of the pipe-rod coupling.

[0021] The invention has reasonable design, simple structure and low manufacturing cost, and provides high accuracy of passing information of pipe-rod couplings, thereby providing an effective positioning device for pipe-rod couplings for intelligent well repair, solving the problem that has long plagued intelligent well repair, having significant use effect and being able to achieve significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0023] In the attached picture:

[0024] Figure 1 It is a sectional view of the front view of the present invention.

[0025] Figure 2 yes Figure 1 Cross-section view from top.

[0026] Figure 3 yes Figure 2 A partial enlarged view of the mid-displacement conduction mounting mechanism.

[0027] Figure 4 It is a schematic structural diagram of the second embodiment of the winding wire in the present invention.

[0028] Figure 5 It is a structural schematic diagram of a second embodiment of welding the displacement conduction mounting mechanism and the housing.

[0029] 1-shell, 2-elastic body, 3-winding wire, 4-displacement conduction installation mechanism, 5-reset spring, 6-displacement output end, 7-tube rod coupling, 8-fixing ear plate, 4-1-sealed connection box body, 4-2-seal, 4-3-spring installation sleeve. DETAILED DESCRIPTION

[0030] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] See also Figures 1 to 5 A downhole pipe coupling detection and positioning device for well repairing operation is provided with a shell 1 and an elastic body 2. The elastic body 2 wound with a winding wire 3 is installed in the shell 1. The free end of the winding wire 3 passes through the shell wall of the shell 1 and passes through a seal 4-2 and a reset spring 5 installed in a displacement transmission installation mechanism 4, and then is connected to a displacement output end 6. The pipe coupling 7 pulled out or lowered into the well passes through the elastic body 2 wound with the winding wire 3 of the present invention. When the pipe coupling 7 passes through the elastic body 2, the displacement output end 6 can be driven by the winding wire 3 to move in the displacement transmission installation mechanism 4, so that the pipe coupling displacement detection device receives the coupling position detection instruction of the pipe coupling detection and positioning device in real time.

[0033] Based on the above embodiment 1, the present invention also has the following embodiments:

[0034] The overall shape of the elastic body 2 is I-shaped, and a winding wire groove is provided in the middle. The depth and width of the winding wire groove are consistent with the shape and number of winding turns of the winding wire 3.

[0035] A pressure balancing hole is provided in the main body of the elastomer 2 below the winding wire clamping groove, and the number of the pressure balancing holes is set between 1 and 30. The elastomer 2 provided with the pressure balancing hole can be used for pressure well repair operations in oil and water wells. The pressure balancing hole can balance the pressure in the well, and can also be used for minor repair operations in oil and water wells.

[0036] The elastic body 2 below the winding wire clamping groove has no pressure balancing hole in its body, and the elastic body 2 without the pressure balancing hole can only be used for minor repair work of oil and water wells.

[0037] The displacement conduction installation mechanism 4 is provided with a sealing connection box 4-1 and a spring installation sleeve 4-3. The sealing connection box 4-1 is threadedly connected or plugged with the spring installation sleeve 4-3. The sealing connection box 4-1 is equipped with a seal 4-2. The reset spring 5 and the displacement output end 6 are installed in the spring installation sleeve 4-3. The free end of the winding wire 3 passes through the seal 4-2 of the sealing connection box 4-1 and the reset spring 5 in the spring installation sleeve 4-3 and is connected to the displacement output end 6.

[0038] The shell 1 is in an I-shape as a whole, with flanges at both ends, bolt holes are provided in the flanges at both ends, a winding wire passing hole or a sealing connection box passing hole is provided in the shell wall of the shell 1, or two winding wire passing holes or two sealing connection box passing holes are provided in the shell wall of the shell 1.

[0039] The root of the sealed connection box 4-1 can be inserted into the sealed connection box through hole of the shell 1 and then welded to the shell 1 outside the shell 1; the root of the sealed connection box 4-1 can be directly welded to the outer position of the winding wire through hole of the shell 1, see Figure 5 .

[0040] The displacement output end 6 is provided with a detection device connector and a retaining ring, a winding wire passing hole is provided in the retaining ring, the outer diameter of the retaining ring is smaller than the inner diameter of the spring installation sleeve 4-3, the outer diameter of the detection device connector is larger than the inner diameter of the winding wire passing hole in the retaining ring, the free end of the winding wire 3 passes through the retaining ring and is connected to the detection device connector in the displacement output end 6, and the detection device connector is connected to the pipe rod coupling displacement detection device in the intelligent well repair system through a cable. The displacement output end 6 can be driven by the winding wire 3 to move in the spring installation sleeve 4-3 and can allow the pipe rod coupling displacement detection device in the intelligent well repair system to receive the passing signal of the pipe rod coupling in the well in real time.

[0041] There are two ways of winding the winding wire 3 in the elastomer 2. One is that the winding wire 3 is provided with two free ends, which are respectively passed through the two winding wire outlet holes of the shell 1 or the sealing connection box 4-1 in the sealing connection box through hole; the other is that the winding wire 3 is provided with one free end, and is passed through only one winding wire outlet hole of the shell 1 or the sealing connection box 4-1 in the sealing connection box through hole; accordingly, the shell 1 can also be provided with only one winding wire outlet hole or a sealing connection box through hole, or can be provided with two winding wire outlet holes or a sealing connection box through holes.

[0042] The winding wire 3 is provided with two free ends.

[0043] The following is a second embodiment of the winding wire 3, wherein the winding wire 3 is provided with a free end, and when the winding wire 3 is provided with a free end connected to the connector of the detection device in the displacement output end 6, the other end of the winding wire 3 is a fixed end, and the fixed end is fixed in the fixed ear plate 8, and the fixed ear plate 8 is welded to the inner wall of the shell 1.

[0044] The fixed end of the winding wire 3 can be wound back from the fixing ear plate 8 and then bound or fixed in a fixing bolt in the fixing ear plate 8 .

[0045] The inner diameter of the elastomer 2 after being wound by the winding wire 3 is smaller than the outer diameter of the pipe rod coupling 7; the number of winding turns of the winding wire 3 in the elastomer 2 is set between 1 turn and 30 turns, and the number of winding turns is linearly related to the retraction amount output by the reset spring 5, that is, the more winding turns of the winding wire 3, the greater the retraction amount of the reset spring 5; the elastomer 2 can be made of elastic materials such as polyurethane rubber, nitrile rubber, silicone rubber, fluororubber, EPDM rubber, chloroprene rubber, butyl rubber, acrylic rubber, natural rubber, polymer materials, etc., and the winding wire 3 can be made of materials such as steel wire, iron wire, aluminum wire, copper wire, capillary, wire rope, nylon wire, carbon fiber wire, PE wire, etc.

[0046] The downhole pipe rod coupling detection and positioning device can be installed at a position above the wellhead spool of the working well. If the device is used in a minor repair working well, it can be directly connected to the upper flange of the wellhead spool or the upper flange of any blowout preventer, and only one device of the present invention needs to be connected; if the device is used in a pressurized working well, two devices of the present invention can be installed in the blowout preventer group above the wellhead, one device of the present invention is installed below the bottom semi-sealed blowout preventer in the blowout preventer group; the other device of the present invention is installed between any two semi-sealed blowout preventers in the blowout preventer group, and a total of two devices of the present invention are installed.

[0047] After the winding wire 3 is wound in the winding wire slot of the elastic body 2, the free end passes through the housing 1 and is connected to the pipe rod coupling displacement detection device in the intelligent well repair system through the reset spring 5 and the displacement output end 6 in the displacement transmission installation mechanism 4. When the pipe rod coupling 7 passes through the elastic body 2, the elastic body 2 is expanded and deformed, causing the winding wire 3 to stretch. The free end of the winding wire 3 drives the reset spring 5 to move and retract in the axial direction in the displacement transmission installation mechanism 4. After the pipe rod coupling 7 passes through the elastic body 2, due to the action of the reset spring 5, the winding wire 3 gradually returns to the initial state as the expansion deformation of the elastic body 2 gradually disappears.

[0048] The embodiments described above are only typical embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A downhole pipe rod coupling detection and positioning device for well repair operations, characterized in that: A housing (1) and an elastic body (2) are provided. The elastic body (2) wound with a winding wire (3) is installed in the housing (1). The free end of the winding wire (3) passes through the housing wall of the housing (1) and passes through a seal (4-2) and a return spring (5) installed in a displacement transmission installation mechanism (4) to be connected to a displacement output end (6). The displacement transmission installation mechanism (4) is provided with a sealing connection box (4-1) and a spring installation sleeve (4-3). The sealing connection box (4-1) and the spring installation sleeve (4-3) are threadedly connected or plugged. The sealing connection box (4-1) is equipped with a sealing member (4-2). The return spring (5) and the displacement output end (6) are installed in the spring installation sleeve (4-3). The free end of the winding wire (3) passes through the sealing member (4-2) of the sealing connection box (4-1) and the return spring (5) in the spring installation sleeve (4-3) to be connected to the displacement output end (6).

2. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 1, characterized in that: The overall shape of the elastic body (2) is an I-shape, and a winding wire groove is provided in the middle, wherein the depth and width of the winding wire groove are consistent with the shape and number of winding turns of the winding wire (3).

3. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 2, characterized in that: A pressure balancing hole is provided in the main body of the elastic body (2) below the winding wire clamping groove, and the number of the pressure balancing holes is set between 1 and 30.

4. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 2, characterized in that: No pressure balancing hole is provided in the main body of the elastic body (2) below the winding wire clamping groove.

5. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 1, characterized in that: The shell (1) is in an I-shape as a whole, with flanges at both ends, bolt holes are provided in the flanges, a winding wire through hole or a sealing connection box through hole is provided in the shell wall of the shell (1), or two winding wire through holes or two sealing connection box through holes are provided in the shell wall of the shell (1).

6. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 5, characterized in that: The root of the sealed connection box (4-1) can be inserted into the sealed connection box through hole of the shell (1) and then welded to the shell (1) outside the shell (1); or the root of the sealed connection box (4-1) can be directly welded to the outer position of the winding wire through hole of the shell (1).

7. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 1, characterized in that: The displacement output end (6) is provided with a detection device connector and a retaining ring, wherein a winding wire passing hole is provided in the retaining ring, the outer diameter of the retaining ring is smaller than the inner diameter of the spring mounting sleeve (4-3), and the outer diameter of the detection device connector is larger than the inner diameter of the winding wire passing hole in the retaining ring, the free end of the winding wire (3) passes through the retaining ring and is connected to the detection device connector in the displacement output end (6), and the detection device connector is connected to a pipe rod coupling displacement detection device in the intelligent well repair system via a cable.

8. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 1, characterized in that: The winding wire (3) is provided with two free ends or one free end. When the winding wire (3) is provided with one free end connected to the detection device connector in the displacement output end (6), the other end of the winding wire (3) is a fixed end, which is fixed in a fixed ear plate (8). The fixed ear plate (8) is welded to the inner wall of the housing (1).

9. A downhole pipe rod coupling detection and positioning device for well repair operations as claimed in claim 8, characterized in that: The fixed end of the winding wire (3) can be wound back from the fixing ear plate (8) and then bound or fixed in a fixing bolt in the fixing ear plate (8).

10. A downhole pipe coupling detection and positioning device for well repair operations as claimed in claim 3 or 4, characterized in that: The inner diameter of the elastic body (2) after being wound by the winding wire (3) is smaller than the outer diameter of the pipe rod coupling (7); and the number of winding turns of the winding wire (3) in the elastic body (2) is set between 1 turn and 30 turns.

11. A downhole pipe coupling detection and positioning device for well repair operations according to claim 10, characterized in that: The downhole pipe rod coupling detection and positioning device can be installed at a position above the wellhead spool of an operating well.

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