Casing patching device

Abstract

The utility model discloses a casing patching device which comprises a patching assembly, the patching assembly comprises an upper top cylinder, a patching pipe and a lower top cylinder, the size of the patching pipe is matched with the size of a damaged area of a casing, the patching assembly further comprises an upper compression body, and the upper compression body can expand outwards to be tightly attached to the inner side wall of the casing after being compressed. The patching assembly further comprises a lower compression body, the lower compression body can expand outwards and be tightly attached to the inner side wall of the sleeve after being compressed, a driving cylinder is fixed to the downstream of the patching assembly, the patching assembly further comprises an inner rod penetrating through the patching assembly and the driving cylinder, the upstream end of the inner rod is connected with a driving structure, and the downstream end of the inner rod extends out of the driving cylinder. A slip structure is arranged at the position, corresponding to the driving cylinder, of the inner rod, and an unlocking structure capable of unlocking the slip structure is arranged at the position, located on the downstream portion of the slip structure, of the inner rod. Rapid and effective repair of local damage of the sleeve is achieved, and the repair efficiency and the quality stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil drilling, and particularly relates to a casing patching device. BACKGROUND

[0002] In the field of oil and gas exploration and development, as an important component of oil and gas wells, the stability and integrity of casing directly relate to the safety production and economic benefits of oil and gas fields. However, with the increase of oil and gas well mining years, casing is often affected by corrosion, wear, geological structure stress and other factors, resulting in damage in local areas, such as perforation, cracking and the like. If these damages are not repaired in time, not only the normal production of oil and gas wells will be affected, but also safety accidents such as blowout and formation fluid channeling may occur, causing great loss to enterprises and environment.

[0003] Traditional casing repair methods mainly include replacing the whole casing and local welding repair. Although replacing the whole casing can effectively solve the casing damage problem, it has high cost, long construction period and great influence on oil and gas field production. Although local welding repair has relatively low cost, thermal stress is easily generated in the welding process, affecting the overall performance of the casing, and the welding quality is difficult to guarantee, and the repair effect is unstable. At present, the repair methods for casing damage at home and abroad mainly include the following:

[0004] 1. Replacing the whole casing: this method is suitable for the case where the casing damage is serious and cannot be repaired locally. However, the construction is complex, the cost is high, the period is long, and the production needs to be stopped, which has great influence on the production of oil and gas fields.

[0005] 2. Local welding repair: the damaged area is repaired by welding. However, thermal stress is easily generated in the welding process, affecting the overall performance of the casing; and the welding quality is greatly affected by the skill level of the operator, and the repair effect is unstable.

[0006] 3. Casing patching technology: in recent years, casing patching technology has gradually been valued and applied in actual production. This technology repairs local damage of casing by designing and installing patching parts, and has the advantages of simple construction, low cost and short repair period. However, there are still some problems in the actual application of the existing patching technology, such as insufficient fixing strength between the patching part and the casing, poor sealing performance and the like, which affect the repair effect and service life.

[0007] Therefore, it is particularly important to explore a casing patching device that is both economical and efficient and stable and reliable. CONTENT OF THE UTILITY MODEL

[0008] In order to achieve the above purpose, the utility model provides a casing patching device. The specific technical scheme is as follows:

[0009] A casing patching device, comprising a patching assembly, the patching assembly comprising an upper top cylinder, a patching pipe and a lower top cylinder arranged in sequence along an upstream-downstream direction and both ends of which are open, the patching pipe being sized to match the size of a damaged area of the casing, the patching assembly further comprising an upper compression body arranged between the upper top cylinder and the patching pipe and both ends of which are open, the upper compression body being capable of expanding outwardly and tightly adhering to the inner sidewall of the casing after being compressed in the upstream-downstream direction, the patching assembly further comprising a lower compression body arranged between the lower top cylinder and the patching pipe and both ends of which are open, the lower compression body being capable of expanding outwardly and tightly adhering to the inner sidewall of the casing after being compressed in the upstream-downstream direction, the patching assembly being fixed downstream of the lower top cylinder and both ends of the driving cylinder being open, further comprising an inner rod arranged along the upstream-downstream direction through the inside of the patching assembly and the driving cylinder, the upstream end of the inner rod extending out of the patching assembly and being connected to a driving structure, the downstream end of the inner rod extending out of the driving cylinder, the inner rod being provided with a slip structure corresponding to the position of the driving cylinder, and the position of the inner rod downstream of the slip structure being provided with an unlocking structure capable of unlocking the slip structure.

[0010] In operation, the driving structure drives the inner rod to ascend, and initially the inner rod and the driving cylinder ascend synchronously so that the upper compression body and the lower compression body are compressed and then tightly adhere to the inner sidewall of the casing, at this time the driving cylinder is in a fixed state, the inner rod continues to ascend so that the unlocking structure unlocks the slip structure so that the slip structure can anchor the driving cylinder to the inner wall of the casing, and then the driving structure lifts the inner rod to pull it out of the patching assembly.

[0011] Preferably, the driving structure comprises:

[0012] A hollow upper joint, the downstream of the upper joint being provided with a hydraulic assembly, the upper joint being connected to a telescopic member of the hydraulic assembly, the upstream of the upper joint being used to communicate with the tubing string so that it can be injected with high-pressure liquid;

[0013] The hydraulic assembly comprises an outer sleeve, a lower ring being fixedly and sealingly connected to the lower end of the outer sleeve, and a lower sleeve being fixedly and sealingly connected to the lower end of the outer sleeve, the telescopic member being located inside the outer sleeve and the lower sleeve;

[0014] The telescopic member comprises an upper pipe, the upper pipe penetrating the outer sleeve and the lower ring, the upper end of the upper pipe being fixedly and sealingly connected to the upper joint, the lower ring being slidingly and sealingly connected to the upper pipe, the outer sidewall of the upper pipe being provided with a convex ring, the convex ring being slidingly and sealingly connected to the inner wall of the outer sleeve, an inner hole being formed in the upper pipe and being in communication with the annular cavity between the convex ring and the lower ring, and the lower end of the upper pipe being used to directly or indirectly connect the inner rod.

[0015] As preferred, the adjusting combination set further comprises a connecting outer cylinder, a connecting inner cylinder and a pull rod, the upper end of the connecting outer cylinder is fixedly connected with the lower end of the lower cylinder sleeve, the connecting outer cylinder has an inner thread and the inner thread connects the connecting inner cylinder, the lower end of the connecting inner cylinder is threadedly connected with the upper end of the upper top cylinder, the pull rod is located in the cavity of the connecting outer cylinder and the connecting inner cylinder, the lower end of the upper pipe is fixedly and sealingly connected with the upper end of the pull rod, the upper end of the inner rod is fixedly connected with the lower end of the pull rod, and the thread rotation direction of the connection between the upper top cylinder and the connecting inner cylinder is opposite to the thread rotation direction of the connection between the connecting outer cylinder and the connecting inner cylinder.

[0016] As preferred, the inner part of the upper top cylinder is slidably provided with an upper inner sleeve, the lower end of the upper inner sleeve is located below the upper top cylinder, the lower part of the upper inner sleeve is provided with an upper boss, the part of the upper inner sleeve between the upper boss and the upper top cylinder is sleeved with an upper top ring, the part of the upper inner sleeve between the upper top ring and the upper boss is sleeved with the upper compression body which is an upper copper sleeve, the lower end of the upper inner sleeve is fixedly connected with the subsidy pipe, the lower end of the subsidy pipe is fixedly connected with a lower inner sleeve, the upper end of the lower inner sleeve is provided with a lower boss, the lower inner sleeve is slidably inserted into the lower top cylinder, the part of the lower inner sleeve between the lower boss and the lower top cylinder is sleeved with the lower compression body which is a lower copper sleeve, and the part of the lower inner sleeve between the lower copper sleeve and the lower top cylinder is sleeved with a lower top ring.

[0017] As preferred, the outer edge of the upper end of the upper inner sleeve is provided with a plurality of upper conical ring grooves, the upper conical ring grooves are sleeved with conical clamping rings, the outer edge of the clamping ring is in contact with the inner edge of the upper top cylinder, the outer edge of the lower end of the lower inner sleeve is provided with a plurality of lower conical ring grooves, the lower conical ring grooves are sleeved with conical clamping rings, and the outer edge of the clamping ring is in contact with the inner edge of the lower top cylinder.

[0018] As preferred, the inner rod of the inner part of the driving cylinder is sleeved with a slip sleeve, the outer side of the slip sleeve is fixedly connected with a slip shoe through a shear pin, the driving cylinder is provided with an opening corresponding to the slip shoe, the driving cylinder above the opening is provided with a guide inclined surface, the slip shoe is located in the opening and the upper end of the slip shoe is in contact with the guide inclined surface, thereby forming the slip shoe structure.

[0019] The inner side of the oversheath is provided with a sleeve, the inner rod penetrates through the sleeve, the lower end of the sleeve is internally provided with a tapered ring groove, a plurality of tapered clamping blocks are uniformly arranged on the inner circumference of the tapered ring groove, the clamping blocks are tightly abutted against the outer edge of the inner rod, the tapered surface of the clamping blocks is in contact with the tapered surface of the tapered ring groove, the outer side of the sleeve is sleeved and fixed with a fixed sleeve, the fixed sleeve is provided with a ring groove, the inside of the ring groove is sleeved with a fixed ring, the outer circumference of the fixed ring is uniformly fixed with a plurality of stop blocks, the upper part of the stop blocks is located between the fixed sleeve and the driving cylinder, the lower part of the stop blocks blocks the lower end of the driving cylinder, an annular spring is sleeved on the outer side of the plurality of stop blocks, the inner rod below the sleeve is sleeved and fixed with a stop sleeve, the lower end of the stop sleeve is provided with an outwardly protruding flange, and the sleeve forms the unlocking structure.

[0020] Preferably, grooves are arranged on the stop blocks, and the annular spring is located in the grooves.

[0021] Preferably, the outer sides of the upper compression body and the lower compression body are coated with an adhesive.

[0022] The sleeve patching device has the following technical effects:

[0023] When the sleeve patching device is used, the upper compression body and the lower compression body are tightly attached to the inner wall of the sleeve, the driving cylinder is anchored in the sleeve, displacement of the patching assembly in the sleeve is prevented, the patching pipe can stably adhere to the damaged area of the sleeve, the patching assembly has good stability, the plurality of tight attachment modes are realized by lifting of the inner rod, the inner rod can be recycled for reuse, local damage of the sleeve can be quickly and effectively repaired, the sleeve repair efficiency and quality are improved, the repair cost is reduced, and the safety production of oil and gas wells is ensured.

[0024] Preferably, the driving structure is arranged, high-pressure liquid can be injected into the tubing string to lift the upper pipe and then lift the inner rod. The structure is simple and has low cost.

[0025] Preferably, an adjusting combined sleeve is arranged, a pull rod with a suitable length can be matched according to the actual use condition to adjust the length of the patching device. The screw thread rotation direction of the connection between the upper top cylinder and the connection inner cylinder is opposite to the screw thread rotation direction of the connection between the connection outer cylinder and the connection inner cylinder, so that the upper top cylinder and the connection inner cylinder can be quickly separated by rotating the tubing string, and then the inner rod and other components can be more conveniently recycled.

[0026] As preferred, during working, the oil pipe string is pressurized, the high pressure liquid in the oil pipe string and the upper pipe enters the ring cavity between the convex ring and the lower ring through the inner hole, and the upper pipe drives the pull rod and the inner rod to go up. When the inner rod goes up, the clamping sleeve, the fixed sleeve, the plurality of blocks, the driving cylinder, the slip sleeve and the slip go up during the process that the inner rod goes up due to the engagement of the clamping block and the inner rod. Meanwhile, the lower top cylinder, the lower top ring, the lower copper sleeve, the lower inner sleeve, the subsidy pipe and the upper inner sleeve go up. Since the upper top ring is blocked by the upper top cylinder, the upper copper sleeve and the lower copper sleeve are compressed and expanded during the process that the lower top cylinder, the lower top ring, the lower copper sleeve, the lower inner sleeve, the subsidy pipe and the upper inner sleeve go up. After the upper copper sleeve and the lower copper sleeve are in sealing contact with the inner wall of the casing, the lower top cylinder, the lower top ring, the lower copper sleeve, the lower inner sleeve, the subsidy pipe, the upper inner sleeve and the driving cylinder cannot continue to go up. With the continuous upward movement of the inner rod, the fixed connection between the fixed ring and the block breaks, and the fixed sleeve and the block move relatively. Since the plurality of block outer sleeves are provided with annular springs, the blocks will not fall and will not cause fish in the well. During the subsequent upward movement of the inner rod, the slip sleeve is driven to go up by the clamping sleeve. The slip expands during the process that the slip sleeve goes up with the inner rod. When the shear pin connected between the slip and the slip sleeve is sheared, the driving cylinder is anchored in the casing. Then the oil pipe string is rotated to separate the upper top cylinder from the connection inner cylinder. Then the hydraulic assembly, the adjusting combined sleeve, the pull rod, the inner rod, the slip sleeve, the fixed sleeve, the clamping sleeve and the stop sleeve are pulled out from the subsidy assembly. When the blocks correspond to the stop sleeve, the plurality of blocks are sleeved on the stop sleeve and are blocked by the flange at the lower end of the stop sleeve under the elastic force of the annular spring. Then the plurality of blocks are pulled out with the upward movement of the stop sleeve. The recycling of these components is realized to facilitate reuse, which can obviously save costs. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of the subsidy device.

[0028] Figure 2 It is a Figure 1 A-A sectional view.

[0029] Figure 3 It is a Figure 2 An enlarged view of the A area.

[0030] Figure 4 It is a Figure 2 An enlarged view of the B area.

[0031] Figure 5 It is a Figure 2 An enlarged view of the C area.

[0032] Figure 6 It is a schematic view of the subsidy device after the casing is subsidized.

[0033] Figures 1-6 In the drawings, the following signs are used:

[0034] 1, upper joint, 2, upper tube, 3, outer cylinder sleeve, 4, lower ring, 5, convex ring, 6, inner hole, 7, pull rod, 8, connecting outer cylinder, 9, connecting inner cylinder, 10, upper top cylinder, 11, upper top ring, 12, upper copper sleeve, 13, upper inner sleeve, 14, subsidy tube, 15, lower inner sleeve, 16, lower copper sleeve, 17, lower top ring, 18, lower top cylinder, 19, drive cylinder, 20, stop block, 21, fixed ring, 22, annular spring, 23, fixed sleeve, 24, clamp sleeve, 25, clamping block, 26, blocking sleeve, 27, inner rod, 28, slip sleeve, 29, clamping ring, 30, guide inclined surface, 31, slip, 32, lower cylinder sleeve, 33, sleeve. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will make further detailed description of a sleeve subsidy device and sleeve subsidy process of the utility model combined with the drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be more clear. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate, clear and assist the purpose of explaining the embodiment of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the drawings. It is known that the structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that people skilled in the art can understand and read, and not to limit the implementation conditions of the utility model, so it does not have the technical essence, any modification of structure, change of proportion relationship or adjustment of size, as long as it does not affect the effect and purpose that the utility model can produce, it should still fall within the scope of the technical content disclosed by the utility model.

[0036] In combination Figures 1-6The utility model discloses a casing patching device, including the patching assembly, this patching assembly includes the upper top cylinder 10 of setting up in sequence along the upstream and downstream direction and both ends are open setting, the patching pipe 14 and the lower top cylinder 18, the size of this patching pipe 14 is matched the size of the damaged area of casing 33, this patching assembly still includes the upper compression body of setting between the upper top cylinder 10 and patching pipe 14 and both ends are open setting, the upper compression body can be expanded and tightly attached to the inner side wall of casing 33 after being compressed in the upstream and downstream direction, this patching assembly still includes the lower compression body of setting between the lower top cylinder 18 and patching pipe 14 and both ends are open setting, the lower compression body can be expanded and tightly attached to the inner side wall of casing 33 after being compressed in the upstream and downstream direction, the downstream of the patching assembly is fixed a both ends are open setting drive cylinder 19, still including the inner rod 27 of the inside of this patching assembly and drive cylinder 19 is arranged along the upstream and downstream direction and is penetrated, the upstream end of inner rod 27 is stretched out this patching assembly and is connected a drive structure, the downstream end of inner rod 27 is stretched out drive cylinder 19, the inner rod 27 is provided with slip structure corresponding the position of drive cylinder 19, the position of the inner rod 27 downstream of the slip structure is provided with the unlocking structure that can unlock the slip structure;

[0037] When working, the drive structure drives the inner rod 27 to ascend, initially the inner rod 27 and drive cylinder 19 are synchronous and ascend so that the upper compression body and lower compression body are compressed and in turn tightly attached to the inner side wall of casing 33, at this time drive cylinder 19 is in fixed state, the inner rod 27 continues to ascend so that the unlocking structure unlocks the slip structure so that the slip structure can make drive cylinder 19 be anchored in the inner wall of casing 33, subsequently the drive structure lifts the inner rod 27 and pulls out from the patching assembly.

[0038] When using the casing patching device, the patching assembly can be prevented from displacing in casing 33 by relying on the tight attachment of the upper compression body and lower compression body to the inner wall of casing 33 and the anchoring of drive cylinder 19 in casing 33, so that the patching pipe can stably adhere to the damaged area of casing 33, and the patching assembly has good stability; and the various tight attachment modes are realized by lifting the inner rod, which is convenient and fast, and the inner rod 27 can be recycled for reuse. The casing patching device can realize rapid and effective repair of local damage of casing 33, aims to improve casing 33 repair efficiency and quality, reduce repair cost, and ensure the safe production of oil and gas wells.

[0039] In combination Figures 1-6 In one specific embodiment, the drive structure includes:

[0040] The upper joint 1 is hollowly arranged, the lower stream of the upper joint 1 is provided with a hydraulic assembly, the upper joint 1 is connected with the telescopic piece of the hydraulic assembly, the upper stream of the upper joint 1 is used for connecting the tubing string so that the high-pressure liquid can be injected;

[0041] The hydraulic assembly comprises an outer cylinder sleeve 3, a lower ring 4 fixedly and sealingly connected to the lower end of the outer cylinder sleeve 3, and a lower cylinder sleeve 32 fixedly and sealingly connected to the lower end of the outer cylinder sleeve 3, wherein the telescopic member is located inside the outer cylinder sleeve 3 and the lower cylinder sleeve 32;

[0042] The telescopic member comprises an upper pipe 2 penetrating through the outer cylinder sleeve 3 and the lower ring 4, the upper end of the upper pipe 2 being fixedly and sealingly connected to the upper joint 1, the lower ring 4 being slidingly and sealingly connected to the upper pipe 2, the outer sidewall of the upper pipe 2 being provided with a convex ring 5 slidingly and sealingly connected to the inner wall of the outer cylinder sleeve 3, and an inner hole 6 being formed in the upper pipe 2 and being in communication with the annular cavity between the convex ring 5 and the lower ring 4, the lower end of the upper pipe 2 being used for directly or indirectly connecting the inner rod 27.

[0043] The driving structure is provided, high-pressure liquid can be injected through the tubing string, the upper pipe 2 can be lifted, and then the inner rod 27 can be lifted. The structure is simple and low in cost.

[0044] In one specific embodiment, the upper pipe 2 is fixedly and sealingly connected to the upper joint 1, the lower ring 4 is slidingly and sealingly connected to the upper pipe 2, the outer sidewall of the upper pipe 2 is provided with the convex ring 5 slidingly and sealingly connected to the inner wall of the outer cylinder sleeve 3, the inner hole 6 is formed in the upper pipe 2 and is in communication with the annular cavity between the convex ring 5 and the lower ring 4, and the lower end of the upper pipe 2 is used for directly or indirectly connecting the inner rod 27. Figures 1-6 The adjusting combined sleeve comprises a connecting outer cylinder 8, a connecting inner cylinder 9, and a pull rod 7, the upper end of the connecting outer cylinder 8 is fixedly connected to the lower end of the lower cylinder sleeve 32, the connecting outer cylinder 8 is internally threaded and the connecting inner cylinder 9 is connected to the internal thread, the lower end of the connecting inner cylinder 9 is threadedly connected to the upper end of an upper top cylinder 10, the pull rod 7 is located in the cavities of the connecting outer cylinder 8 and the connecting inner cylinder 9, the lower end of the upper pipe 2 is fixedly and sealingly connected to the upper end of the pull rod 7, the upper end of the inner rod 27 is fixedly connected to the lower end of the pull rod 7, and the thread connected between the upper top cylinder 10 and the connecting inner cylinder 9 is opposite in rotation direction to the thread connected between the connecting outer cylinder 8 and the connecting inner cylinder 9.

[0045] The adjusting combined sleeve is provided, the pull rod 7 with a length matched with the actual use condition can be matched, the length of the device is adjusted, the thread connected between the upper top cylinder 10 and the connecting inner cylinder 9 is opposite in rotation direction to the thread connected between the connecting outer cylinder 8 and the connecting inner cylinder 9, the upper top cylinder 10 and the connecting inner cylinder 9 can be quickly separated by rotating the tubing string, and the inner rod 27 and other components can be more conveniently recovered.

[0046] In one specific embodiment, the upper pipe 2 is fixedly and sealingly connected to the upper joint 1, the lower ring 4 is slidingly and sealingly connected to the upper pipe 2, the outer sidewall of the upper pipe 2 is provided with the convex ring 5 slidingly and sealingly connected to the inner wall of the outer cylinder sleeve 3, the inner hole 6 is formed in the upper pipe 2 and is in communication with the annular cavity between the convex ring 5 and the lower ring 4, and the lower end of the upper pipe 2 is used for directly or indirectly connecting the inner rod 27. Figures 1-6The inside of the upper top cylinder 10 is provided with an upper inner sleeve 13, the lower end of the upper inner sleeve 13 is below the upper top cylinder 10, the lower part of the upper inner sleeve 13 is provided with an upper boss, the part of the upper inner sleeve 13 between the upper boss and the upper top cylinder 10 is sleeved with an upper top ring 11, the part of the upper inner sleeve 13 between the upper top ring 11 and the upper boss is sleeved with the upper compression body which is an upper copper sleeve 12, the lower end of the upper inner sleeve 13 is fixedly connected with the subsidy pipe 14, the lower end of the subsidy pipe 14 is fixedly connected with a lower inner sleeve 15, the upper end of the lower inner sleeve 15 is provided with a lower boss, the lower inner sleeve 15 is slidingly inserted into the lower top cylinder 18, the part of the lower inner sleeve 15 between the lower boss and the lower top cylinder 18 is sleeved with the lower compression body which is a lower copper sleeve 16, the part of the lower inner sleeve 15 between the lower copper sleeve 16 and the lower top cylinder 18 is sleeved with a lower top ring 17.

[0047] The upper end of the upper inner sleeve 13 is provided with a plurality of upper conical ring grooves, the upper conical ring grooves are sleeved with conical clamping rings 29, the clamping claws of the outer edge of the clamping ring 29 are in contact with the inner edge of the upper top 10 cylinder, the lower end of the lower inner sleeve 15 is provided with a plurality of lower conical ring grooves, the lower conical ring grooves are sleeved with conical clamping rings 29, the clamping claws of the outer edge of the clamping ring 29 are in contact with the inner edge of the lower top cylinder 18.

[0048] In the specific embodiment, the inner rod 27 in the inside of the driving cylinder 19 is sleeved with a slip sleeve 28, the outer side of the slip sleeve 28 is fixedly connected with a slipper 29 through a shear pin, the driving cylinder 19 is provided with an opening corresponding to the slipper 29, the driving cylinder 19 above the opening is provided with a guide inclined surface 30, the slipper 29 is located in the opening and the upper end of the slipper 29 is in contact with the guide inclined surface 30, forming the slipper structure;

[0049] The inner side of the slip sleeve 28 is provided with a clamp sleeve 24, the inner rod 27 penetrates through the clamp sleeve 24, the lower end of the clamp sleeve 24 is internally provided with a conical ring groove, a plurality of conical clamping blocks 25 are uniformly arranged in the conical ring groove, the clamping claws of the clamping block 25 are tightly abutted against the outer edge of the inner rod 27, the taper surface of the clamping block 25 is in contact with the taper surface of the conical ring groove, the outer side of the clamp sleeve 24 is sleeved with a fixed sleeve 23, the fixed sleeve 23 is provided with a ring groove, the inside of the ring groove is sleeved with a fixed ring 21, the outer side of the fixed ring 21 is uniformly fixed with a plurality of stop blocks 20, the upper part of the stop block 20 is between the fixed sleeve 23 and the driving cylinder 19, the lower part of the stop block 20 blocks the lower end of the driving cylinder 19, an annular spring 22 is sleeved on the outer side of the plurality of stop blocks 20, the inner rod 27 below the clamp sleeve 24 is sleeved with a stop sleeve 26, the lower end of the stop sleeve 26 is provided with an outwardly protruding flange, the clamp sleeve 24 forms the unlocking structure.

[0050] In one embodiment, the method comprises the steps of Figures 1-6 The stopper 20 is provided with a groove, and the annular spring 22 is arranged in the groove.

[0051] The outer sides of the upper compression body and the lower compression body are coated with an adhesive.

[0052] During operation, the oil pipe string is pressurized, and the high-pressure liquid in the oil pipe string and the upper pipe 2 enters the annular cavity between the convex ring 5 and the lower ring 4 through the inner hole 6, and the upper pipe 2 drives the pull rod 7 and the inner rod 27 to move upward.

[0053] When the inner rod 27 moves upward, the clamping sleeve 24, the fixed sleeve 23, the plurality of stoppers 20, the driving cylinder 19, the slip sleeve 28, and the slips 31 move upward due to the engagement of the clamping block 25 with the inner rod 27. At the same time, the lower top cylinder 18, the lower top ring 17, the lower copper sleeve 16, the lower inner sleeve 15, the spacer pipe 14, and the upper inner sleeve 13 move upward. Since the upper top ring 11 is blocked by the upper top cylinder 10, the upper copper sleeve 12 and the lower copper sleeve 16 are compressed and expanded during the upward movement of the lower top cylinder 18, the lower top ring 17, the lower copper sleeve 16, the lower inner sleeve 15, the spacer pipe 14, and the upper inner sleeve 13. After the upper copper sleeve 12 and the lower copper sleeve 16 are in sealing contact with the inner wall of the casing 33, the lower top cylinder 18, the lower top ring 17, the lower copper sleeve 16, the lower inner sleeve 15, the spacer pipe 14, the upper inner sleeve 13, and the driving cylinder 19 cannot continue to move upward. As the inner rod 27 continues to move upward, the fixed connection between the fixed ring 21 and the stopper 20 breaks, and the fixed sleeve 23 and the stopper 20 move relative to each other. Since the plurality of stoppers 20 are provided with annular springs 22, the stoppers 20 will not fall off.

[0054] During the subsequent upward movement of the inner rod 27, the slips 31 expand as the slip sleeve 28 moves upward driven by the clamping sleeve 24. When the shear pin connecting the slips 31 and the slip sleeve 28 is sheared off, the driving cylinder 19 is anchored in the casing 33.

[0055] Then, the oil pipe string is rotated to separate the upper top cylinder 10 from the connecting inner cylinder 9, and then the hydraulic assembly, the adjusting combined sleeve, the pull rod 7, the inner rod 27, the slip sleeve 28, the fixed sleeve 23, the clamping sleeve 24, and the stop sleeve 26 are pulled out from the spacer assembly.

[0056] When the stopper 20 corresponds to the stop sleeve 26, the plurality of stoppers 20 are sleeved on the stop sleeve 26 and are blocked by the flange at the lower end of the stop sleeve 26 under the elastic force of the annular spring 22, and then the plurality of stoppers 20 are pulled out as the stop sleeve 26 moves upward. The structure of the spacer device after spacers are applied to the casing 33 is shown in Figure 6

[0057] ​The upper snap ring 29 and the lower snap ring 29 can prevent the upper inner sleeve 13 and the lower top cylinder 18 from descending, can ensure the extrusion force on the upper copper sleeve 12 and the lower copper sleeve 16, and further ensure the pressure of the upper copper sleeve 12 and the lower copper sleeve 16 on the inner wall of the casing 33, thereby improving the patching effect on the casing 33. At the same time, the driving cylinder 19 is anchored in the casing 33 by the driving cylinder 19 provided with the slip 31, which can prevent the patching assembly from displacing in the casing 33, and the patching assembly has good stability.

[0058] The patching device can realize patching on the casing 33 to be patched in one trip, and the plurality of stop blocks 20 can be taken out from the well, without causing fish falling in the well.

[0059] The casing patching device is also provided.

[0060] S1, comprehensively detecting the casing 33 by using ultrasonic detection and downhole camera detection, accurately positioning the damaged area and evaluating the damage degree: using an ultrasonic detector to comprehensively scan the casing 33, finding the damaged area of the casing 33 and marking the specific position and size, and then observing the details of the casing 33 damage through downhole camera, evaluating the damage type and severity, providing basis for the design of the subsequent patching device;

[0061] S2, designing and customizing the patching device according to the shape, size of the damaged area and the parameters of the casing 33 material: according to the shape, size of the damaged area of the casing 33 and the casing 33 material, using CAD software to design the three-dimensional patching device, ensuring that the patching pipe 14 of the patching assembly in the patching device can tightly fit the inner surface of the casing 33, and selecting a material matching the casing 33 material to prepare the patching pipe 14;

[0062] S3, cleaning the damaged area of the casing 33, and then polishing the damaged area of the casing 33;

[0063] S4, lowering the patching device into the casing 33, and making the patching assembly of the patching device correspond to the damaged area of the casing 33, and then starting the patching device to extrude the upper compression body and the lower compression body of the patching assembly, the upper compression body and the lower compression body are extruded and expanded to seal with the inner wall of the casing 33, then the driving cylinder 19 is anchored on the inner wall of the casing 33, and then the driving structure pulls out the inner rod 27 from the patching assembly;

[0064] S5, detecting and evaluating the repair effect of the damaged area of the casing 33 by using ultrasonic detection and pressure test: after the repair is completed, the patching area of the casing 33 is detected again by using an ultrasonic detector to confirm that there is no defect between the patching assembly and the casing 33, and then a pressure test is performed to simulate the pressure environment under the working condition of the oil and gas well, and to detect the pressure bearing capacity and sealing performance of the patching area.

[0065] The step S3 comprises: using a high-pressure water jet and a cleaning agent to clean the damaged area of the sleeve 33, then performing a scraping treatment on the cleaned damaged area of the sleeve 33, and performing a secondary cleaning on the treated damaged area of the sleeve 33 by using anhydrous ethanol or acetone solvent.

[0066] The above technical effects are achieved.

[0067] The technical features of the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0068] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A cannula bolster device, characterized by, The subsidy assembly comprises an upper top cylinder, a subsidy pipe and a lower top cylinder arranged in sequence in the upstream and downstream directions and both ends of which are open, the size of the subsidy pipe matches the size of the damaged area of the sleeve pipe, the subsidy assembly further comprises an upper compression body arranged between the upper top cylinder and the subsidy pipe and both ends of which are open, the upper compression body can be expanded outward and tightly attached to the inner side wall of the sleeve pipe after being compressed in the upstream and downstream directions, the subsidy assembly further comprises a lower compression body arranged between the lower top cylinder and the subsidy pipe and both ends of which are open, the lower compression body can be expanded outward and tightly attached to the inner side wall of the sleeve pipe after being compressed in the upstream and downstream directions, the downstream of the subsidy assembly is fixed with a driving cylinder which both ends are open, and further comprises an inner rod arranged in the upstream and downstream directions and penetrating the interiors of the subsidy assembly and the driving cylinder, the upstream end of the inner rod extends out of the subsidy assembly and is connected with a driving structure, the downstream end of the inner rod extends out of the driving cylinder, the inner rod is provided with a slip structure corresponding to the position of the driving cylinder, and the position of the inner rod downstream of the slip structure is provided with an unlocking structure capable of unlocking the slip structure. In operation, the driving structure drives the inner rod to rise, and initially the inner rod and the driving cylinder rise synchronously so that the upper compression body and the lower compression body are compressed and then tightly attached to the inner side wall of the sleeve pipe, at this time the driving cylinder is in a fixed state, the inner rod continues to rise so that the unlocking structure unlocks the slip structure so that the slip structure can anchor the driving cylinder to the inner wall of the sleeve pipe, and then the driving structure lifts the inner rod to pull it out of the subsidy assembly.

2. The cannula bolster device of claim 1, wherein, The driving structure comprises: a hollow upper joint, the downstream of the upper joint is provided with a hydraulic assembly, the upper joint is connected with a telescopic part of the hydraulic assembly, the upstream of the upper joint is used for communicating with the oil pipe string so that the oil pipe string can be injected with high-pressure liquid; the hydraulic assembly comprises an outer cylinder sleeve, the lower end of the outer cylinder sleeve is fixedly and sealingly connected with a lower ring, and the lower end of the outer cylinder sleeve is fixedly and sealingly connected with a lower cylinder sleeve, and the telescopic part is located inside the outer cylinder sleeve and the lower cylinder sleeve; the telescopic part comprises an upper pipe, the upper pipe penetrates the outer cylinder sleeve and the lower ring, the upper end of the upper pipe is fixedly and sealingly connected with the upper joint, the lower ring is slidingly and sealingly connected with the upper pipe, the outer side wall of the upper pipe is provided with a convex ring which is slidingly and sealingly connected with the inner wall of the outer cylinder sleeve, an inner hole is formed in the upper pipe and communicates with the annular cavity between the convex ring and the lower ring, and the lower end of the upper pipe is used for directly or indirectly connecting the inner rod.

3. The cannula bolster device of claim 2, wherein, Further comprising an adjusting combined sleeve, the adjusting combined sleeve comprises a connecting outer cylinder, a connecting inner cylinder and a pull rod, the upper end of the connecting outer cylinder is fixedly connected with the lower end of the lower cylinder sleeve, the connecting outer cylinder has an inner thread and the inner thread connects the connecting inner cylinder, the lower end of the connecting inner cylinder is threadedly connected with the upper end of the upper top cylinder, the pull rod is located in the cavities of the connecting outer cylinder and the connecting inner cylinder, the lower end of the upper pipe is fixedly and sealingly connected with the upper end of the pull rod, the upper end of the inner rod is fixedly connected with the lower end of the pull rod, and the thread rotation direction of the connection between the upper top cylinder and the connecting inner cylinder is opposite to the thread rotation direction of the connection between the connecting outer cylinder and the connecting inner cylinder.

4. The cannula bolster device of claim 3, wherein, The inside of the upper top cylinder is slidably provided with an upper inner sleeve, the lower end of the upper inner sleeve is below the upper top cylinder, the lower part of the upper inner sleeve is provided with an upper boss, the part of the upper inner sleeve between the upper boss and the upper top cylinder is sleeved with an upper top ring, the part of the upper inner sleeve between the upper top ring and the upper boss is sleeved with the upper compression body which is an upper copper sleeve, the lower end of the upper inner sleeve is fixedly connected with the subsidy pipe, the lower end of the subsidy pipe is fixedly connected with a lower inner sleeve, the upper end of the lower inner sleeve is provided with a lower boss, the lower inner sleeve is slidably inserted into the lower top cylinder, the part of the lower inner sleeve between the lower boss and the lower top cylinder is sleeved with the lower compression body which is a lower copper sleeve, the part of the lower inner sleeve between the lower copper sleeve and the lower top cylinder is sleeved with a lower top ring.

5. The cannula bolster device of claim 4, wherein, The outer edge of the upper end of the upper inner sleeve is provided with a plurality of upper conical ring grooves, the upper conical ring grooves are sleeved with conical clamping rings, the clamping teeth of the outer edge of the clamping ring are in contact with the inner edge of the upper top cylinder, the outer edge of the lower end of the lower inner sleeve is provided with a plurality of lower conical ring grooves, the lower conical ring grooves are sleeved with conical clamping rings, the clamping teeth of the outer edge of the clamping ring are in contact with the inner edge of the lower top cylinder.

6. The cannula bolster device of claim 5, wherein, A slip sleeve is sleeved on the inner rod in the inside of the driving cylinder, the outer side of the slip sleeve is fixedly connected with a slipper through a shear pin, the driving cylinder is provided with an opening corresponding to the slipper, the driving cylinder above the opening is provided with a guide slope, the slipper is located in the opening and the upper end of the slipper is in contact with the guide slope, forming the slipper structure; The inner side of the slip sleeve is provided with a clamp sleeve, the inner rod penetrates through the clamp sleeve, the lower end of the clamp sleeve is internally provided with a conical ring groove, a plurality of conical clamping blocks are uniformly arranged on the inner circumference of the conical ring groove, the clamping teeth of the clamping blocks are tightly abutted against the outer edge of the inner rod, the taper surface of the clamping blocks is in contact with the taper surface of the conical ring groove, the outer side of the clamp sleeve is sleeved and fixedly provided with a fixing sleeve, the fixing sleeve is provided with a ring groove, the inside of the ring groove is sleeved with a fixing ring, a plurality of stop blocks are uniformly arranged on the outer circumference of the outer side of the fixing ring, the upper part of the stop blocks is between the fixing sleeve and the driving cylinder, the lower part of the stop blocks blocks the lower end of the driving cylinder, an annular spring is sleeved on the outer side of the plurality of stop blocks, a stop sleeve is fixedly sleeved on the inner rod below the clamp sleeve, the lower end of the stop sleeve is provided with an outwardly protruding flange, the clamp sleeve forms the unlocking structure.

7. The cannula bolster device of claim 6, wherein, The stop blocks are provided with grooves, and the annular spring is located in the grooves.

8. The cannula bolster device of claim 1, wherein, The outer sides of the upper compression body and the lower compression body are coated with an adhesive.

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