Double sliding switch device

Abstract

The present invention relates to the technical field of switches for snubbing operations, and is a double-sleeve switch device, which includes a working sleeve, an outer sleeve, an inner sleeve and a three-stage shear pin, an inner sleeve and an outer sleeve are sequentially mounted on the inner side of the working sleeve above the three-stage shear pin from the inside to the outside, at least two inner leakage holes distributed along the circumference are arranged in the middle of the outer sleeve, and corresponding outer leakage holes are arranged on the working sleeve corresponding to each position of the inner leakage hole, an outer limit ring platform is fixed on the outer side of the top of the outer sleeve, an inner limit ring groove is arranged on the inner side of the working sleeve corresponding to the position of the outer limit ring platform, and there is a gap between the bottom of the outer limit ring platform and the bottom of the inner limit ring groove; a rod throwing seat hole is arranged on the inner side of the outer sleeve corresponding to the position above the inner sleeve. The present invention has a reasonable and compact structure, is easy to use, is reliable in opening and closing, improves the success rate of blocking the pipe column for snubbing operations, and does not require the cooperation of a pump truck, simplifies the operation, saves costs, and has the characteristics of safety, labor saving, simplicity, and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of snubbing operation switches and relates to a double-sliding sleeve switch device. Background Art

[0002] In the non-squelching operation of the water injection well, the operation method for the concentric injection string is to use a hydraulic circulation control switch to plug the string above the upper protective packer. After the string is lowered, the pump truck is used to pressurize it forward to change the track of the core of the hydraulic circulation control switch, and then the pump truck is used to pressurize it backward to reversely circulate the core of the hydraulic circulation control switch out of the wellhead. However, the probability that the core of the hydraulic circulation control switch can be reversely circulated out of the wellhead is very low, and the reliability is very poor. In the above situation, rework is required. More importantly, when the concentric injection string is lifted and lowered, the string below the protective packer (tool string, middle pipe, tail pipe and its accessories) cannot be plugged, and it is impossible to construct a wellhead with a relatively long string below the protective packer.

[0003] In the snubbing operation of a self-flowing well, the current operation method is to raise the pipe string and insert a plugging device to plug the oil pipe, but the plugging depth of the plugging device is not easy to determine; the pipe string is lowered and the sliding sleeve constant pressure switch is used to plug the oil pipe, but after the pipe string is lowered into place, the sliding sleeve constant pressure switch must be opened again by a pump truck, and the plugging device must be inserted again during the next snubbing operation. All these operations are cumbersome and complicated, labor-intensive, uneconomical, and the plugging success rate is also low.

[0004] The above switch tools are characterized by the need to be opened by pump trucks after entering the well, and can only be opened once and cannot be closed. The plug must be lowered again to seal the oil pipe when the well is not snubbing. When the pipe string is lifted without snubbing, the tool string below the plug cannot be blocked. Summary of the invention

[0005] The present invention provides a double-sleeve switch device, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems that the switch of the existing non-well pressure operation needs to be opened by pressure pumping, can only be opened once, cannot be closed, and cannot seal the tool string below the plug when lifting the pipe column.

[0006] The technical solution of the present invention is achieved through the following measures: a double-slip sleeve switch device, comprising a working sleeve, an outer sleeve, an inner sleeve and a three-stage shear nail, at least two mounting holes evenly distributed along the circumference are provided in the middle of the working sleeve, a three-stage shear nail is provided in each mounting hole, the three-stage shear nail comprises a small diameter section, a middle diameter section and a large diameter section fixed together in sequence, the large diameter section is fixedly installed in the mounting hole corresponding thereto, the middle diameter section and the small diameter section extend into the working sleeve, the inner side of the working sleeve above the three-stage shear nail is sequentially sleeved with an inner sleeve and an outer sleeve from the inside to the outside, the outer sleeve and the inner sleeve are both in the shape of a sleeve with an opening at the bottom, the outer sleeve is seated on the middle diameter section, the inner sleeve is seated on the small diameter section, and at least two inner leakage flow holes distributed along the circumference are provided in the middle of the outer sleeve. A hole is provided on the working sleeve corresponding to each inner leakage hole position, an outer leakage hole corresponding thereto is provided on the working sleeve, a sealing device is provided between the working sleeve and the outer sleeve at the positions above and below the inner leakage hole, and a sealing device is provided between the inner sleeve and the outer sleeve at the positions above and below the inner leakage hole, respectively; an outer limiting ring platform is fixed on the outer side of the top of the outer sleeve, an inner limiting ring groove is provided on the inner side of the working sleeve corresponding to the position of the outer limiting ring platform, and a spacing is provided between the bottom of the outer limiting ring platform and the bottom of the inner limiting ring groove; a sealing device is provided between the outer side of the outer limiting ring platform and the inner side of the working sleeve at the corresponding position, a bat throwing seat hole is provided on the inner side of the outer sleeve corresponding to the position above the inner sleeve, and at least one pressure relief hole distributed along the circumference is provided on the inner sleeve corresponding to the position of the bat throwing seat hole.

[0007] The following are further optimizations and / or improvements to the above technical solutions:

[0008] Sealing devices may be respectively provided between the working sleeve and the outer sleeve at the positions above and below the corresponding internal leakage hole, sealing devices may be respectively provided between the inner sleeve and the outer sleeve at the positions above and below the corresponding internal leakage hole, and a sealing device may be provided between the outer side of the outer limit ring and the inner side of the working sleeve at the corresponding position.

[0009] The above-mentioned sealing devices can all be at least one O-ring distributed at intervals along the up-down direction. Two sealing ring grooves distributed at intervals along the up-down direction are respectively provided on the inner side of the outer sleeve corresponding to the positions above and below the inner leakage hole, and each sealing ring groove is provided with an O-ring capable of sealing the gap between the outer sleeve and the inner sleeve; two sealing ring grooves distributed at intervals along the up-down direction are respectively provided on the inner side of the working sleeve corresponding to the positions above and below the inner leakage hole, and each sealing ring groove is provided with an O-ring capable of sealing the gap between the outer sleeve and the working sleeve; a sealing ring groove is provided on the outer side of the outer limit ring platform, and the sealing ring groove is provided with an O-ring capable of sealing the gap between the outer limit ring platform and the inner limit ring groove.

[0010] An internal threaded hole may be provided on the inner side of the top of the working sleeve, a connecting short section is fixed on the bottom of the working sleeve, and an external thread is provided on the outer side of the connecting short section.

[0011] An oil pipe nipple may be fixedly installed on the outer side of the connecting nipple, and a thread plug may be fixedly installed on the inner side of the bottom end of the oil pipe nipple.

[0012] The top of the working sleeve below the internal threaded hole may be inclined inwardly and downwardly.

[0013] The double-sliding sleeve switch device may further include a rod throwing opening, wherein the maximum diameter of the rod throwing opening is smaller than the minimum inner diameter of the rod throwing seat hole.

[0014] The above-mentioned double-sliding sleeve switch device may also include a closed rod throwing device, and the maximum diameter of the closed rod throwing device is greater than the minimum inner diameter of the rod throwing seat hole.

[0015] The above-mentioned pitching seat hole can be in the shape of an inverted cone with a width at the top and a narrowness at the bottom.

[0016] The invention has a reasonable and compact structure, is easy to use, has reliable opening and closing, improves the success rate of pipe plugging in snubbing operations, does not require the cooperation of a pump truck, simplifies operation, saves costs, and has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the main cross-sectional structure of the initial state of the best embodiment of the present invention.

[0018] Attached Figure 2 This is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention after the bat is thrown into the open position.

[0019] Attached Figure 3 This is a schematic diagram of the front cross-sectional structure of the best embodiment of the present invention after the bat is thrown and closed.

[0020] The codes in the accompanying drawings are: 1 is a working sleeve, 2 is an outer sliding sleeve, 3 is an inner sliding sleeve, 4 is a small diameter section, 5 is a medium diameter section, 6 is a large diameter section, 7 is an inner leakage hole, 8 is an outer leakage hole, 9 is an outer limit ring platform, 10 is an inner limit ring groove, 11 is a rod throwing seat hole, 12 is a pressure relief hole, 13 is an open rod throwing, 14 is a closed rod throwing, 15 is an O-ring, 16 is a sealing ring groove, 17 is an internal threaded hole, 18 is a connecting short section, 19 is an external thread, 20 is an oil pipe short section, and 21 is a thread plug. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0023] The present invention will be further described below in conjunction with embodiments and drawings:

[0024] As attached Figure 1 , 2 As shown in Figure 3, the double-sleeve switch device includes a working sleeve 1, an outer sleeve 2, an inner sleeve 3 and a three-stage shear nail. The middle part of the working sleeve 1 is provided with at least two mounting holes evenly distributed along the circumference, and each mounting hole is provided with a three-stage shear nail. The three-stage shear nail includes a small diameter section 4, a middle diameter section 5 and a large diameter section 6 fixed together in sequence. The large diameter section 6 is fixedly installed in the mounting hole corresponding thereto, and the middle diameter section 5 and the small diameter section 4 extend into the working sleeve. The inner side of the working sleeve 1 above the three-stage shear nail is sequentially covered with an inner sleeve 3 and an outer sleeve 2 from the inside to the outside. The outer sleeve 2 and the inner sleeve 3 are both sleeve-shaped with an opening at the bottom, and the outer sleeve 2 is seated on the middle diameter section. On the section 5, the inner sleeve 3 is seated on the small diameter section 4, and at least two inner leakage holes 7 distributed along the circumference are provided in the middle of the outer sleeve 2, and the working sleeve 1 corresponding to each position of the inner leakage hole 7 is provided with an outer leakage hole 8 corresponding thereto, an outer limit ring platform 9 is fixed to the outer side of the top of the outer sleeve 2, and an inner limit ring groove 10 is provided on the inner side of the working sleeve 1 corresponding to the position of the outer limit ring platform 9, and there is a gap between the bottom of the outer limit ring platform 9 and the bottom of the inner limit ring groove 10; a rod throwing seat hole 11 is provided on the inner side of the outer sleeve 2 corresponding to the upper position of the inner sleeve 3, and at least one pressure relief hole 12 distributed along the circumference is provided on the inner sleeve 3 corresponding to the position of the rod throwing seat hole 11. The present invention can be applied to the non-squeezing operation of concentric injection wells and self-flowing wells. When in use, the present invention is connected to the bottom end of the pipe string, the pipe string is lowered, and the inner sliding sleeve 3 blocks the inner leakage flow hole 7 and the outer leakage flow hole 8. At this time, the liquid in the well will not pass through the pipe string up and down to the wellhead, thereby realizing safe and environmentally friendly operation; when the pipe string is lowered to the designed depth and it is necessary to carry out water injection, oil production and other operations, an opening throwing rod 13 with a diameter smaller than the minimum inner diameter 11 of the minimum inner diameter of the throwing rod seat hole is thrown into the pipe string from the upper end, the opening throwing rod 13 passes through the throwing rod seat hole 11, hits the inner sliding sleeve 3, and cuts the small diameter section 4 of the third-level shear nail. 3 As the opening throw rod 13 slides down, the inner leakage flow hole 7 and the outer leakage flow hole 8 are exposed, and the pipe string is connected with the oil layer casing, and water injection or self-flowing oil production can be carried out; when the water injection or self-flowing oil production operation is completed, a closing throw rod 14 with an outer diameter larger than the smallest inner diameter of the minimum inner diameter 11 of the throw rod seat hole is thrown inward from the upper end of the pipe string, and under the impact of the closing throw rod 14, the outer sliding sleeve 2 cuts off the middle diameter section 5 of the three-level shear nail, and the outer sliding sleeve 2 moves downward and blocks the outer leakage flow hole 8 until the outer limit ring platform 9 is limited by the bottom of the inner limit ring groove 10, and the connection between the pipe string and the oil layer casing is blocked, and the well-suppressing well repair operation can be carried out. The present invention has a reasonable and compact structure, is easy to use, has reliable opening and closing, improves the success rate of the pipe string blocking of the well-suppressing operation, and does not require the cooperation of a pump truck, simplifies the operation, saves costs, and has the characteristics of safety, labor saving, simplicity and high efficiency.

[0025] The above double-sleeve switch device can be further optimized and / or improved according to actual needs:

[0026] As attached Figure 1 , 2 As shown in Figures 3 and 4, sealing devices are provided between the working sleeve 1 and the outer sleeve 2 at the positions above and below the inner leakage hole 7, sealing devices are provided between the inner sleeve 3 and the outer sleeve 2 at the positions above and below the inner leakage hole 7, and sealing devices are provided between the outer side of the outer limit ring 9 and the inner side of the working sleeve 1 at the corresponding position. The above arrangement ensures the overall sealing and reliability of the present invention.

[0027] As attached Figure 1 , 2 As shown in , 3, the sealing devices are at least one O-ring 15 spaced apart in the up-down direction, and two sealing ring grooves 16 spaced apart in the up-down direction are respectively provided on the inner side of the outer sleeve 2 corresponding to the upper and lower positions of the inner leakage hole 7, and each sealing ring groove 16 is provided with an O-ring 15 capable of sealing the gap between the outer sleeve 2 and the inner sleeve 3; two sealing ring grooves 16 spaced apart in the up-down direction are respectively provided on the inner side of the working sleeve 1 corresponding to the upper and lower positions of the inner leakage hole 7, and each sealing ring groove 16 is provided with an O-ring 15 capable of sealing the gap between the outer sleeve 2 and the working sleeve 1; a sealing ring groove 16 is provided on the outer side of the outer limit ring platform 9, and an O-ring 15 capable of sealing the gap between the outer limit ring platform 9 and the inner limit ring groove 10 is provided in the sealing ring groove 16. The sealing ring grooves 16 are respectively arranged inside the outer sleeve 2 and the working sleeve 1, which can reduce the downward resistance of the inner sleeve 3 and the outer sleeve 2 while ensuring the sealing performance of the present invention, thereby ensuring the reliability of the opening and closing of the present invention.

[0028] As attached Figure 1 , 2 As shown in FIG. 3 , an internal thread hole 17 is provided on the inner side of the top of the working sleeve 1, a connecting nipple 18 is fixed on the bottom of the working sleeve 1, and an external thread 19 is provided on the outer side of the connecting nipple 18. The arrangement of the internal thread and the connecting nipple 18 facilitates the connection between the present invention and other devices such as a pipe string.

[0029] As attached Figure 1 , 2 As shown in FIG. 3 , a tubing nipple 20 is fixedly installed on the outside of the connecting nipple 18, and a thread plug 21 is fixedly installed on the inside of the bottom end of the tubing nipple 20. The arrangement of the tubing nipple 20 and the thread plug 21 can seal the bottom end of the working sleeve 1, and also facilitate the recovery of the throwing rod 13.

[0030] As attached Figure 1 , 2As shown in FIG. 3 , the top of the working sleeve 1 below the internal threaded hole 17 is inclined downwardly toward the inside. The above arrangement reduces the probability of the opening and closing of the throwing rod 13 and 14 being blocked when they are moving downward, further ensuring the reliability of the present invention.

[0031] As attached Figure 1 , 2 As shown in FIG. 3 , the present invention further comprises an open rod throwing device 13, the maximum diameter of which is smaller than the minimum inner diameter of the minimum inner diameter of the rod throwing seat hole 11. After the open rod throwing device 13 matching the present invention is configured, the present invention is convenient to use.

[0032] As attached Figure 1 , 2 As shown in FIG. 3 , the present invention further comprises a closed throwing stick 14, the maximum diameter of which is greater than the minimum inner diameter of the throwing stick seat hole 11. After the closed throwing stick 14 matching the present invention is configured, the present invention is convenient to use.

[0033] As attached Figure 1 , 2 As shown in FIG. 3 , the pitching seat hole 11 is in an inverted cone shape with a wide top and a narrow bottom. The above arrangement further reduces the probability of the open pitching 13 and the closed pitching 14 being blocked, and at the same time, it can cooperate with the closed pitching 14 so that the closed pitching 14 can be stably seated in the pitching seat hole 11.

[0034] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A double-sleeve switch device, characterized in that It comprises a working sleeve, an outer sliding sleeve, an inner sliding sleeve and a three-stage shearing nail. At least two mounting holes evenly distributed along the circumference are arranged in the middle of the working sleeve. A three-stage shearing nail is arranged in each mounting hole. The three-stage shearing nail comprises a small diameter section, a middle diameter section and a large diameter section fixed together in sequence. The large diameter section is fixedly installed in the mounting hole corresponding thereto. The middle diameter section and the small diameter section extend into the working sleeve. The inner side of the working sleeve above the three-stage shearing nail is sequentially covered with an inner sliding sleeve and an outer sliding sleeve from the inside to the outside. Both the outer sliding sleeve and the inner sliding sleeve are in the shape of a sleeve with an opening at the bottom. The outer sliding sleeve is seated on the middle diameter section, and the inner sliding sleeve is seated on the small diameter section. At least two inner leakage holes distributed along the circumference are arranged in the middle of the outer sliding sleeve. The working The working sleeve is provided with corresponding external leakage holes, sealing devices are respectively provided between the working sleeve and the outer sleeve at the positions above and below the corresponding internal leakage holes, and sealing devices are respectively provided between the inner sleeve and the outer sleeve at the positions above and below the corresponding internal leakage holes, an outer limiting ring platform is fixed on the outer side of the top of the outer sleeve, an inner limiting ring groove is provided on the inner side of the working sleeve corresponding to the position of the outer limiting ring platform, and a gap is provided between the bottom of the outer limiting ring platform and the bottom of the inner limiting ring groove; a sealing device is provided between the outer side of the outer limiting ring platform and the inner side of the working sleeve at the corresponding position, a bat throwing seat hole is provided on the inner side of the outer sleeve corresponding to the position above the inner sleeve, and at least one pressure relief hole distributed along the circumference is provided on the inner sleeve corresponding to the position of the bat throwing seat hole. , sealing devices are respectively provided between the working sleeve and the outer sleeve at the positions above and below the inner leakage hole, sealing devices are respectively provided between the inner sleeve and the outer sleeve at the positions above and below the inner leakage hole, and a sealing device is provided between the outer side of the outer limit ring and the inner side of the working sleeve at the corresponding position, and the sealing devices are at least one O-ring spaced apart in the up-and-down direction, and two sealing ring grooves spaced apart in the up-and-down direction are respectively provided on the inner side of the outer sleeve at the positions above and below the inner leakage hole, and each sealing ring groove is provided with an O-ring capable of sealing the gap between the outer sleeve and the inner sleeve; two sealing ring grooves spaced apart in the up-and-down direction are respectively provided on the inner side of the working sleeve at the positions above and below the inner leakage hole Sealing ring grooves, each of which is provided with an O-ring capable of sealing the gap between the outer sliding sleeve and the working sleeve; a sealing ring groove is provided on the outer side of the outer limit ring platform, and an O-ring capable of sealing the gap between the outer limit ring platform and the inner limit ring groove is provided in the sealing ring groove; an internal threaded hole is provided on the inner side of the top of the working sleeve, a connecting short section is fixed on the bottom of the working sleeve, an external thread is provided on the outer side of the connecting short section, an oil pipe short section is fixedly installed on the outer side of the connecting short section, a threaded plug is fixedly installed on the inner side of the bottom end of the oil pipe short section, the top of the working sleeve below the internal threaded hole is inclined inwardly and downwardly, and also includes an opening throwing rod, the maximum diameter of the opening throwing rod is smaller than the minimum inner diameter of the throwing rod seat hole, and the throwing rod seat hole is an inverted cone with a wide top and a narrow bottom.

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