Insertion pipe sealer and insertion pipe water finding and plugging pipe column

Abstract

The utility model relates to the technical field of mechanical water finding and plugging of oil field layered oil production, in particular to an insertion pipe sealer and an insertion pipe water finding and plugging pipe column. The intubation sealer comprises a vertically-through sealing cylinder, the sealing cylinder is provided with an inner cavity allowing an inner pipe column to be inserted, an upper sealing piece and a lower sealing piece are arranged in the sealing cylinder in a vertically-spaced mode, a sealer liquid inlet hole communicated with the inner cavity is formed in the sealing cylinder, the sealer liquid inlet hole is located between the upper sealing piece and the lower sealing piece, and a sealing sleeve is further fixed in the sealing cylinder through a shear pin. The sealing sleeve and the sealing cylinder are matched in a sealing mode to seal the sealer liquid inlet hole, and after the shear pin is cut off, the sealing sleeve slides downwards to avoid the sealer liquid inlet hole. The inserting pipe sealer is located between the upper packer and the lower packer after being assembled, so that when an exploiting layer section is changed, the inserting pipe of the inner pipe column does not need to pass through a long distance and only can pass through the upper sealing piece and the lower sealing piece, and therefore the inserting pipe can meet the three-layer layering exploiting requirement without being too long. And the intubation tube is not easy to bend and deform when being inserted underground.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical water plugging and oil production in layered oilfields, and specifically relates to an inner pipe seal and an inner pipe water plugging and oil production string. Background Art

[0002] In the later stage of the development of heterogeneous thick oil layer oilfields, there are large differences between small layers and it is difficult to determine the distribution of remaining oil. It is necessary to exploit the oil-rich layers in layers and plug the high water-bearing intervals. The commonly used layered exploitation and water plugging and oil production technologies in China include stored intelligent switch water plugging and oil production, cable intelligent switch water plugging and oil production, mechanical inner pipe water plugging and oil production, etc., all of which have certain advantages and disadvantages.

[0003] Stored intelligent switch water plugging and oil production is achieved by lowering intelligent switches and packers with preset opening times. When the sucker rod pump is in production, different intelligent switches are controlled to open and close in sequence through the storage chip to separately suck the corresponding oil layers, and intelligent water finding is carried out by analyzing and testing the water content. The disadvantages are that it is difficult to judge the on-off state of the intelligent switch, and the intelligent switch is limited by the battery life, with a short validity period and high cost.

[0004] Cable intelligent switch water plugging and oil production is achieved by lowering a cable to supply power to and control the intelligent switch. The ground operation controls the intelligent switch, with high reliability. The disadvantage is that the cost is too high, which does not meet the low-cost development requirements in the later stage of the development of old oilfields.

[0005] Mechanical plugging and water shutoff tubing string for locating water producing zones, such as the tubing string for locating water producing zones disclosed in the Chinese utility model patent with the authorization publication number CN220151317U, includes a releasing outer pipe and an inner pipe string. The releasing outer pipe has a central passage for the inner pipe string to be inserted. The releasing outer pipe includes components such as a releasing tool, an upper seal, an upper packer, a lower seal, a lower packer, a screen pipe, and a bottom plug. The components are connected through connecting pipes, which are usually tubing. After the releasing outer pipe is lowered into the casing, an annulus is formed between the releasing outer pipe and the casing. The upper and lower packers are used to be seated in the annulus to divide the oil layer into upper, middle, and lower sections. The two packers divide the releasing outer pipe into upper, middle, and lower sections from the outside. The upper, middle, and lower sections of the releasing outer pipe correspond to the upper, middle, and lower sections of the oil layer respectively. Each section of the releasing outer pipe is provided with an oil inlet passage for connecting the corresponding section of the oil layer with the internal central passage. The upper and lower seals are respectively located on the upper and lower sides of the upper packer. The upper and lower seals each include a sealing cylinder, which has an inner cavity for the inner pipe string to be inserted. A sealing member for sealing cooperation with the plug of the inner pipe string is provided in the sealing cylinder. The inner pipe string has a central passage, and a sucker rod pump is provided in the central passage. The inner pipe string includes tubing, an anchor connected to the tubing, and a plug connected to the lower end of the tubing. The lower end of the plug is closed, and an inner pipe liquid inlet hole communicating with the central passage is provided on the plug. The plug has a sealing cooperation section for sealing cooperation with the upper and lower seals of the releasing outer pipe. When the inner pipe string is inserted into the releasing outer pipe, the position of the inner pipe liquid inlet hole relative to the upper and lower seals is adjusted by lifting and lowering the inner pipe string. When the inner pipe liquid inlet hole is below the sealing member of the lower seal, oil production from the lower section of the oil layer is achieved. When the inner pipe liquid inlet hole is between the sealing members of the upper seal and the lower seal, oil production from the middle section of the oil layer is achieved. When the inner pipe liquid inlet hole is above the sealing member of the upper seal, oil production from the upper section of the oil layer is achieved.

[0006] The existing tubing string for locating water producing zones adjusts the position of the inner pipe liquid inlet hole relative to the upper and lower seals by lifting and lowering the inner pipe string, so that three-layer stratified production can be achieved. However, the following problems exist in the use process: The releasing outer pipe is equipped with two seals, and the two seals are respectively located on the upper and lower sides of the upper packer. The structures of the two seals are different. When connecting the releasing outer pipe, the two seals need to be connected to different positions of the connecting pipe respectively, and the upper and lower positions of the two connectors cannot be wrong, which results in a relatively complex overall structure of the releasing outer pipe and inconvenient connection. Moreover, since the two seals must be respectively located on the upper and lower sides of the upper packer, when changing the production layer section, the plug needs to pass through the upper seal, the packer, and the lower seal. Therefore, the length of the plug must be very long to meet the requirements of three-layer stratified production. And the slender plug is more likely to bend and deform during downhole insertion, resulting in process failure. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide an intubation seal to solve the problems in the prior art that the releasing outer pipe of the intubation plugging water pipe string requires two seals to be configured simultaneously, resulting in inconvenient connection of the releasing pipe string, and the intubation length is very long, which is prone to bending and deformation during downhole insertion, leading to process failure. Another purpose of the present utility model is to provide an intubation plugging water pipe string to solve the problems in the prior art that the connection of the releasing pipe string of the intubation plugging water pipe string is inconvenient, and the intubation length is very long, which is prone to bending and deformation during downhole insertion, leading to process failure.

[0008] To achieve the above purposes, the intubation seal of the present utility model adopts the following technical solutions:

[0009] The intubation seal includes a sealing cylinder that penetrates up and down. The sealing cylinder has an inner cavity for the inner pipe string to be inserted. Upper and lower seals are arranged at intervals up and down in the sealing cylinder. A seal inlet hole communicating with the inner cavity is provided on the sealing cylinder, and the seal inlet hole is located between the upper and lower seals. A sealing sleeve is also fixed in the sealing cylinder by a shear pin. The sealing sleeve is in sealing cooperation with the sealing cylinder to close the seal inlet hole, and after the shear pin is cut off, the sealing sleeve slides down to open the seal inlet hole.

[0010] Further, the sealing cylinder is of a segmented structure, including an upper sealing cylinder, a middle sealing cylinder, and a lower sealing cylinder arranged in sequence from top to bottom. The upper seal is installed in the upper sealing cylinder, the lower seal is installed in the lower sealing cylinder, and the seal inlet hole is provided on the middle sealing cylinder.

[0011] Further, the adjacent two segments of the sealing cylinder can be directly detachably connected or detachably connected through an adapter.

[0012] Further, an upper seal groove is provided on the inner wall surface at the lower end of the upper sealing cylinder. The upper seal is installed in the upper seal groove. An upper stop is provided in the upper sealing cylinder. The upper stop is in stop cooperation with the lower part of the upper seal to limit the upper seal. A lower seal groove is provided on the inner wall surface at the upper end of the lower sealing cylinder. The lower seal is installed in the lower seal groove. A lower stop is provided in the lower sealing cylinder. The lower stop is in stop cooperation with the upper part of the lower seal to limit the lower seal. Making the upper and lower seals closer can further shorten the intubation length.

[0013] Further, the upper stop is detachably connected to the upper sealing cylinder, and the lower stop is detachably connected to the lower sealing cylinder.

[0014] Further, the upper stop is an upper stop ring, and the lower stop is a lower stop ring.

[0015] Further, the middle sealing cylinder is a screen pipe, and the screen holes on the screen pipe form the seal inlet hole.

[0016] Furthermore, a guiding conical surface for guiding the insertion of the inner pipe string is provided on the inner wall surface at the upper end of the sealing cylinder.

[0017] Beneficial effects: The plugging and sealing device of the present utility model is improved on the basis of the existing plugging and sealing device. The plugging and sealing device as a whole is a component, which is used to connect to the releasing outer pipe and is located between the upper and lower packers. By arranging an upper sealing member and a lower sealing member at intervals up and down in the sealing cylinder, a sealing device liquid inlet hole communicating with the inner cavity of the sealing cylinder is arranged on the sealing cylinder, and the sealing device liquid inlet hole is located between the upper and lower sealing members. A sealing sleeve is also fixed in the sealing cylinder by shear pins. When the shear pins are not cut, the sealing sleeve is in sealing cooperation with the sealing cylinder to close the sealing device liquid inlet hole, which will not affect the setting of the packer. After the shear pins are cut, the sealing sleeve slides down to open the sealing device liquid inlet hole. During application, only by changing the position of the inner pipe liquid inlet hole on the inner pipe string relative to the upper and lower sealing members, the layered exploitation of three oil layers can be realized. Since the plugging and sealing device of the present utility model is a whole component, compared with the structure that two plugging and sealing devices need to be configured and connected in the prior art, the connection operation of the releasing pipe string can be made more convenient. Moreover, the plugging and sealing device of the present utility model is located between the upper and lower packers after being assembled. In this way, when changing the exploited layer section, the insertion of the inner pipe string does not need to pass through a long distance, as long as it can pass through the upper sealing member and the lower sealing member. Therefore, the insertion length does not need to be very long to meet the requirement of three-layer layered exploitation, and the insertion length can be significantly shortened. The shortened insertion pipe is not easy to bend and deform when inserted underground, so as to ensure the smooth implementation of the mechanical plugging and water finding process.

[0018] The plugging and water finding pipe string of the present utility model adopts the following technical solution:

[0019] The plugging and water finding pipe string includes a releasing outer pipe and an inner pipe string. The releasing outer pipe has a central channel. The releasing outer pipe includes a connecting pipe, an upper packer, a lower packer and a plugging and sealing device. The two packers divide the releasing outer pipe into upper, middle and lower sections. Oil inlet channels communicating with the central channel are respectively arranged on each section of the releasing outer pipe. The inner pipe string has a central channel inside. The inner pipe string includes a plugging pipe with a closed lower end. An inner pipe liquid inlet hole communicating with the central channel is arranged on the plugging pipe. The plugging and sealing device is located between the upper and lower packers. The plugging and sealing device includes a sealing cylinder that penetrates up and down. The sealing cylinder has an inner cavity for the inner pipe string to be inserted. Upper and lower sealing members are arranged at intervals up and down in the sealing cylinder. A sealing device liquid inlet hole communicating with the inner cavity is arranged on the sealing cylinder. The sealing device liquid inlet hole is located between the upper and lower sealing members. A sealing sleeve is also fixed in the sealing cylinder by shear pins. The sealing sleeve is in sealing cooperation with the sealing cylinder to close the sealing device liquid inlet hole. After the shear pins are cut, the sealing sleeve slides down to open the sealing device liquid inlet hole. The sealing device liquid inlet hole forms the middle section oil inlet channel of the releasing outer pipe. Sealing cooperation sections for forming sealing cooperation with the upper and lower sealing members are arranged on both sides of the inner pipe liquid inlet hole on the plugging pipe.

[0020] Furthermore, the sealing cylinder is of a segmented structure, including an upper sealing cylinder, a middle sealing cylinder and a lower sealing cylinder arranged in sequence from top to bottom. The upper seal is installed in the upper sealing cylinder, the lower seal is installed in the lower sealing cylinder, and the liquid inlet hole of the seal is arranged on the middle sealing cylinder.

[0021] Furthermore, the adjacent two segments of the sealing cylinder are directly detachably connected or detachably connected through an adapter.

[0022] Furthermore, an upper sealing groove is provided on the inner wall surface of the lower end of the upper sealing cylinder, and the upper seal is installed in the upper sealing groove. An upper stop is arranged in the upper sealing cylinder, and the upper stop and the lower part of the upper seal are in stop cooperation to limit the upper seal; a lower sealing groove is provided on the inner wall surface of the upper end of the lower sealing cylinder, and the lower seal is installed in the lower sealing groove. A lower stop is arranged in the lower sealing cylinder, and the lower stop and the upper part of the lower seal are in stop cooperation to limit the lower seal. The upper and lower seals are close to each other, which can further shorten the length of the intubation tube.

[0023] Furthermore, the upper stop is detachably connected to the upper sealing cylinder, and the lower stop is detachably connected to the lower sealing cylinder.

[0024] Furthermore, the upper stop is an upper stop ring, and the lower stop is a lower stop ring.

[0025] Furthermore, the middle sealing cylinder is a screen pipe, and the screen holes on the screen pipe constitute the liquid inlet hole of the seal.

[0026] Furthermore, a guiding conical surface for guiding the insertion of the inner pipe string is provided on the inner wall surface of the upper end of the sealing cylinder.

[0027] Furthermore, the bottom of the releasing outer pipe is blocked. A connector is connected to the lower section of the releasing outer pipe. The connector includes a connector body. There is a pressure transmission channel inside the connector body. A pressure transmission hole communicating with the pressure transmission channel is provided on the connector body. A sliding sleeve is fixed to the outside of the connector body through a pin. The sliding sleeve is in sealing cooperation with the connector body to block the pressure transmission hole. After the pin is cut off, the sliding sleeve slides down to open the pressure transmission hole. The pressure transmission hole constitutes the oil inlet channel of the lower section of the releasing outer pipe.

[0028] Beneficial effects: The plugging and unplugging water pipe string of the present utility model is improved on the basis of the existing plugging and unplugging water pipe string. A new plugging and unplugging device is adopted. The plugging and unplugging device is an integral part, connected to the releasing outer pipe and located between the upper and lower packers. By arranging an upper sealing member and a lower sealing member at intervals up and down in the sealing cylinder, a liquid inlet hole communicating with the inner cavity of the sealing cylinder is arranged on the sealing cylinder, and the liquid inlet hole of the sealing device is located between the upper and lower sealing members. A sealing sleeve is also fixed in the sealing cylinder by shear pins. When the shear pins are not cut, the sealing sleeve is in sealing cooperation with the sealing cylinder to close the liquid inlet hole of the sealing device, which will not affect the setting of the packer. After the shear pins are cut, the sealing sleeve slides down to open the liquid inlet hole of the sealing device. During application, only by changing the position of the inner pipe liquid inlet hole on the inner pipe string relative to the upper and lower sealing members, the layered exploitation of three oil layers can be realized. Since the plugging and unplugging device is an integral part, compared with the structure that requires configuring and connecting two plugging and unplugging devices in the prior art, the connection operation of the releasing pipe string can be made more convenient. Moreover, the plugging and unplugging device is located between the upper and lower packers. In this way, when changing the exploited layer section, the plugging of the inner pipe string does not need to pass through a long distance, as long as it can pass through the upper sealing member and the lower sealing member. Therefore, the plugging length does not need to be very long to meet the requirements of three-layer layered exploitation, and the plugging length can be significantly shortened. The shortened plugging is not easily bent and deformed when inserted into the well, so as to ensure the smooth implementation of the mechanical plugging and unplugging water process. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the plugging and unplugging water pipe string of the present utility model when exploiting the lower oil layer;

[0030] Figure 2 It is a schematic structural diagram of the plugging and unplugging water pipe string of the present utility model when exploiting the middle oil layer;

[0031] Figure 3 It is a schematic structural diagram of the plugging and unplugging water pipe string of the present utility model when exploiting the upper oil layer;

[0032] Figure 4 It is a schematic structural diagram of the plugging and unplugging device in the embodiment of the plugging and unplugging water pipe string of the present utility model;

[0033] Figure 5 It is a schematic structural diagram of the connector in the embodiment of the plugging and unplugging water pipe string of the present utility model;

[0034] In the figure: 11, tubing; 12, sucker rod; 13, sucker rod pump; 14, inserting pipe; 15, inner pipe liquid inlet hole; 16, inserting pipe guide cone; 17, central channel; 21, releasing tool; 22, connecting pipe; 23, upper packer; 24, inserting pipe seal; 25, lower packer; 26, connector; 27, plug; 28, central channel; 301, tubing collar; 302, upper sealing cylinder; 303, upper seal; 304, upper stop piece; 305, screen pipe; 3050, seal liquid inlet hole; 306, sealing sleeve; 307, lower stop piece; 308, lower seal; 309, lower sealing cylinder; 310, shear pin; 311, guiding conical surface; 401, connector body; 402, pressure transmission channel; 403, pressure transmission hole; 404, groove; 405, sliding sleeve; 406, pin; 51, upper oil layer; 52, middle oil layer; 53, lower oil layer. Specific implementation mode

[0035] Aiming at the problems existing in the existing inserting pipe water finding and plugging string, the basic technical concept of the inserting pipe water finding and plugging string of the present utility model is as follows: the releasing outer pipe is divided into upper, middle and lower sections by the upper and lower packers connected to the releasing outer pipe, oil inlet channels communicating with the central channel of the releasing outer pipe are respectively arranged on each section of the releasing outer pipe, inner pipe liquid inlet holes are arranged on the inserting pipe of the inner pipe string, the inserting pipe seal is integrally a component and is located between the upper and lower packers, upper and lower seals are arranged at intervals up and down in the sealing cylinder of the inserting pipe seal, a seal liquid inlet hole communicating with the inner cavity of the sealing cylinder is arranged on the sealing cylinder, and the seal liquid inlet hole is located between the upper and lower seals. The seal liquid inlet hole constitutes the middle section oil inlet channel of the releasing outer pipe. By lifting and lowering the inner pipe string to change the position of the inner pipe liquid inlet hole relative to the upper and lower seals, the layered exploitation of the three oil layers can be realized. The inserting pipe seal is integrally a component. Compared with the structure that two seals need to be configured and connected in the prior art, the connection operation of the releasing string can be made more convenient. Moreover, the inserting pipe seal is located between the upper and lower packers. In this way, when changing the exploited layer section, the inserting pipe of the inner pipe string does not need to pass through a long distance, as long as it can pass through the upper seal and the lower seal. Therefore, the length of the inserting pipe does not need to be very long to meet the requirement of three-layer layered exploitation, the length of the inserting pipe can be significantly shortened, and it is not easy to bend and deform when inserted into the well, so as to ensure the smooth implementation of the mechanical inserting pipe water finding and plugging process.

[0036] The features and performance of the present utility model will be further described in detail below in conjunction with embodiments.

[0037] Embodiment of the inserting pipe water finding and plugging string of the present utility model:

[0038] As Figures 1-3As shown in the figure, the plugging and unplugging water pipe string for intubation includes a releasing outer pipe and an inner pipe string. The releasing outer pipe has a central channel 28 into which the inner pipe string can be inserted. The releasing outer pipe includes a releasing tool 21, an upper packer 23, an intubation seal 24, a lower packer 25, a connector 26, and a nipple 27 arranged in sequence from top to bottom. Each component is connected by a connecting pipe 22, and the connecting pipe 22 can be an oil pipe 11. The upper and lower packers are arranged at intervals to divide the releasing outer pipe into upper, middle, and lower sections from the outside. Each section of the releasing outer pipe is provided with an oil inlet channel communicating with the central channel 28. During use, the releasing outer pipe is lowered into the casing to form an oil-casing annulus between the releasing outer pipe and the casing. The upper and lower packers are used to seat in the oil-casing annulus to divide the oil layer into upper, middle, and lower sections, and the upper, middle, and lower sections of the oil layer respectively correspond to the upper, middle, and lower sections of the releasing outer pipe.

[0039] The inner pipe string has a central channel 17 inside, and the central channel 17 serves as an oil production channel. A sucker rod 12 is arranged in the central channel 17. The inner pipe string includes an oil pipe 11, a submersible pump 13 connected to the oil pipe 11, and an intubation 14 connected to the lower end of the oil pipe 11. The lower end of the intubation 14 is closed, and the intubation 14 is provided with an inner pipe liquid inlet hole 15 communicating with the central channel 17. On both the upper and lower sides of the inner pipe liquid inlet hole 15 on the intubation 14, there are sealing cooperation sections for forming a sealing cooperation with the seal of the intubation seal 24. In this embodiment, the outer wall surfaces of the intubation 14 on both the upper and lower sides of the inner pipe liquid inlet hole 15 constitute the sealing cooperation sections for forming a sealing cooperation with the seal of the intubation seal 24. The bottom of the intubation 14 is provided with an intubation guide cone 16 to guide the insertion of the intubation 14 into the intubation seal 24.

[0040] The intubation seal 24 is located between the upper and lower packers. The structure of the intubation seal is as Figure 4As shown in the figure, it includes a sealing cylinder that penetrates up and down. Connection structures for connecting with the connecting pipe 22 are respectively provided at the upper and lower ends of the sealing cylinder. Among them, an oil pipe coupling 301 is connected to the upper end of the sealing cylinder, and the oil pipe coupling 301 constitutes the upper connection structure. The lower end of the sealing cylinder is provided with an external thread, and the external thread constitutes the lower connection structure. Of course, according to actual needs, an oil pipe coupling can also be provided at the lower end of the sealing cylinder to connect with the connecting pipe through the oil pipe coupling, or the oil pipe coupling may not be provided at the upper end of the sealing cylinder, and it can be directly connected to the connecting pipe through the external thread section. The sealing cylinder has an inner cavity into which the inner pipe string can be inserted. Upper and lower sealing members are arranged at intervals up and down in the sealing cylinder, and the upper and lower sealing members are used for forming a sealing fit with the insertion pipe 14 of the inner pipe string. A sealing device liquid inlet hole 3050 communicating with the inner cavity is provided on the sealing cylinder, and the sealing device liquid inlet hole 3050 is located between the upper and lower sealing members. A sealing sleeve 306 is also fixed in the sealing cylinder by shear pins 310. The sealing sleeve 306 is in sealing cooperation with the sealing cylinder to close the sealing device liquid inlet hole 3050. After the shear pins 310 are cut off, the sealing sleeve 306 can slide down to open the sealing device liquid inlet hole 3050, and the sealing device liquid inlet hole 3050 constitutes the middle oil inlet channel for releasing the outer pipe. As Figure 4 shown in the figure, a shear pin perforation is provided at a position near the lower end of the sealing cylinder. A shear pin installation hole is provided on the sealing sleeve 306. The shear pin 310 is fixed in the shear pin installation hole after passing through the shear pin perforation. The shear pin 310 is fixed and installed from the outside to the inside, which is more convenient for assembly.

[0041] The sealing cylinder is of a segmented structure, including an upper sealing cylinder 302, a middle sealing cylinder, and a lower sealing cylinder 309 arranged in sequence from top to bottom. The upper sealing cylinder 302 and the middle sealing cylinder, as well as the middle sealing cylinder and the lower sealing cylinder 309, are respectively detachably connected through a swivel joint. The swivel joint can specifically adopt an oil pipe coupling, and the oil pipe coupling is threadedly connected to the sealing cylinder. The upper sealing member 303 is installed in the upper sealing cylinder 302, the lower sealing member 308 is installed in the lower sealing cylinder 309, and the sealing device liquid inlet hole 3050 is provided on the middle sealing cylinder. By respectively arranging the upper sealing member 303, the lower sealing member 308, and the sealing device liquid inlet hole 3050 on different segments of the sealing cylinder, it is convenient for the installation of the upper and lower sealing members and the setting of the sealing device liquid inlet hole 3050, and it can make the overall assembly operation of the insertion pipe sealing device more convenient. Enabling the adjacent two segments of the sealing cylinder to be detachably connected through a swivel joint can facilitate the installation and replacement of the upper and lower sealing members. Of course, in other embodiments, the adjacent two segments of the sealing cylinder can also be directly threadedly connected.

[0042] Specifically, an upper sealing groove is provided on the inner wall surface at the lower end of the upper sealing cylinder 302, and the upper seal 303 is installed in the upper sealing groove. An upper stop 304 is provided in the upper sealing cylinder 302, and the upper stop 304 is in lower stop cooperation with the lower part of the upper seal 303 to limit the upper seal 303. A lower sealing groove is provided on the inner wall surface at the upper end of the lower sealing cylinder 309, and the lower seal 308 is installed in the lower sealing groove. A lower stop 307 is provided in the lower sealing cylinder 309, and the lower stop 307 is in upper stop cooperation with the upper part of the lower seal 308 to limit the lower seal 308. The key to realizing the layered exploitation of the three oil layers is to raise and lower the inner pipe string to adjust the position of the inner pipe liquid inlet hole 15 on the inner pipe 14 relative to the upper and lower seals. The distance between the upper and lower seals directly affects the length of the inner pipe 14. Installing the upper seal 303 at a lower position in the upper sealing cylinder 302 and the lower seal 308 at an upper position in the lower sealing cylinder 309 can make the distance between the upper and lower seals as close as possible, thereby further shortening the length of the inner pipe and avoiding bending deformation of the inner pipe.

[0043] To facilitate the installation and replacement of the upper and lower seals, the upper stop 304 is detachably connected to the upper sealing cylinder 302, and the lower stop 307 is detachably connected to the lower sealing cylinder 309. In this embodiment, both the upper stop 304 and the upper sealing cylinder 302 and the lower stop 307 and the lower sealing cylinder 309 are threadedly connected. Of course, in other embodiments, detachable connection can also be achieved by screws or bolts. During installation, the upper seal 303 is placed in the upper sealing groove of the upper sealing cylinder 302, and then the upper stop 304 is fixedly connected to the upper sealing cylinder 302. The upper stop 304 is in lower stop cooperation with the lower part of the upper seal 303 to limit the upper seal 303. Similarly, the lower seal 308 is placed in the lower sealing groove of the lower sealing cylinder 309, and then the lower stop 307 is fixedly connected to the lower sealing cylinder 309. The lower stop 307 is in upper stop cooperation with the upper part of the lower seal 308 to limit the lower seal 308.

[0044] The upper stopper 304 is specifically an upper retaining ring, and the lower stopper 307 is specifically a lower retaining ring. The upper retaining ring is of an annular structure and has a sufficiently large retaining and mating area with the upper seal 303, capable of providing uniform and reliable support and retaining and limiting for each part of the upper seal 303 in the circumferential direction. Similarly, the lower retaining ring is of an annular structure and has a sufficiently large retaining and mating area with the lower seal 308, capable of providing uniform and reliable retaining and limiting for each part of the lower seal 308 in the circumferential direction. Of course, in other embodiments, the upper stopper may also adopt other structures. For example, the upper stopper includes a plurality of retaining bumps arranged at intervals on the same circumference, and each retaining bump is fixedly connected to the inner wall surface of the upper sealing cylinder, and the upper seal is retained and limited by the common action of each retaining bump; the lower stopper may also adopt other structures. For example, the lower stopper includes a plurality of retaining bumps arranged at intervals on the same circumference, and each retaining bump is fixedly connected to the inner wall surface of the lower sealing cylinder, and the lower seal is retained and limited by the common action of each retaining bump.

[0045] The middle sealing cylinder is specifically a screen pipe 305, and the screen holes on the screen pipe 305 form the liquid inlet holes 3050 of the seal. In addition, in other embodiments, the middle sealing cylinder may also be an ordinary oil pipe, and a number of through holes are opened on the ordinary oil pipe, and the through holes form the liquid inlet holes of the seal.

[0046] To facilitate the insertion of the insertion pipe 14, a guiding conical surface 311 is further provided on the inner wall surface of the upper end of the upper sealing cylinder 302. The guiding conical surface 311 is inclined gradually from outside to inside and from top to bottom, and is used to guide the insertion of the insertion pipe 14.

[0047] A connector 26 is connected to the lower section of the releasing outer pipe. The structure of the connector is as Figure 5 shown, including a connector body 401 that penetrates up and down. The connector body 401 has a pressure transmission channel 402 inside. A pressure transmission hole 403 communicating with the pressure transmission channel 402 is provided on the connector body 401. A sliding sleeve 405 is fixedly installed outside the connector body 401 through a pin 406. A plurality of sealing rings are provided between the sliding sleeve 405 and the connector body 401 to achieve sealing cooperation between the two, thereby closing the pressure transmission hole 403. A groove 404 is provided on the inner wall surface of the sliding sleeve 405, and the groove 404 communicates with the pressure transmission hole 403. The pressure in the pressure transmission channel 402 is transmitted to the groove 404 of the sliding sleeve 405 through the pressure transmission hole 403, and then transmitted to the pin 406. When the pressure in the pressure transmission channel 402 is greater than the force limit value of the pin 406, the pin 406 is cut off, the sliding sleeve 405 slides down to open the pressure transmission hole 403, the connector 26 is opened, and the pressure transmission hole 403 forms the oil inlet channel for the lower section of the releasing outer pipe. As Figure 5 shown, a pin hole is provided on the outer wall of the connector body 401, a pin perforation is provided on the sliding sleeve 405, and the pin 406 is fixed in the pin hole after passing through the pin perforation. The pin 406 is fixedly installed from outside to inside, and the assembly is more convenient.

[0048] The plugging and locating water pipe string of the utility model can be implemented with reference to the following steps when in use:

[0049] (1) Lower the releasing outer pipe into the oil well casing, so that the upper packer 23 is between the upper oil layer 51 and the middle oil layer 52, and the lower packer 25 is between the middle oil layer 52 and the lower oil layer 53, and three - level stratification of the oil well is carried out through two - stage packers.

[0050] (2) Connect the pump truck pipeline, press - ure the tubing connected above the releasing pipe string, set the upper and lower packers. After the setting is completed, continue to press - ure to open the connector 26.

[0051] (3) Put steel balls of appropriate size into the tubing connected above the releasing pipe string. The steel balls fall to the top of the sealing sleeve 306 in the plugging and sealing device 24. Press - ure the tubing, cut off the shear pins 310 of the plugging and sealing device 24, knock the sealing sleeve 306 to the upper part of the nipple 27, then reverse - thread and release the hand, and lift out the pipe string above the releasing device 21.

[0052] (4) Put the inner pipe string into the oil well casing, insert the inner pipe string into the central channel 28 of the releasing pipe string, and finally lower the sucker rod 12 to complete the trial pumping of the well. When lowering the inner pipe string, the position of the inner pipe liquid inlet hole 15 needs to be adjusted by lifting or lowering according to the required production formation.

[0053] ① If it is necessary to produce the lower oil layer 53, as Figure 1 shown, adjust the position of the inner pipe liquid inlet hole 15 below the lower sealing member 308 of the plugging and sealing device 24. At this time, the oil in the upper oil layer 51 and the middle oil layer 52 cannot enter the plugging pipe 14, and the oil in the lower oil layer 53 enters the plugging pipe 14 through the connector 26 and the inner pipe liquid inlet hole 15 on the plugging pipe 14, and is connected with the oil pump 133 to realize the production of the lower oil layer 53.

[0054] ② If it is necessary to produce the middle oil layer 52, as Figure 2 shown, lift the inner pipe string, adjust the position of the inner pipe liquid inlet hole 15 between the upper sealing member 303 and the lower sealing member 308 of the plugging and sealing device 24. At this time, the oil in the upper oil layer 51 and the lower oil layer 53 cannot enter the plugging pipe 14, and the oil in the middle oil layer enters the plugging pipe 14 through the sealing device liquid inlet hole 3050 on the plugging and sealing device 24 and the inner pipe liquid inlet hole 15 on the plugging pipe 14, and is connected with the oil pump 13 to realize the production of the middle oil layer 52.

[0055] ③ If it is necessary to produce the upper oil layer, as Figure 3As shown in the figure, lift the inner pipe string to adjust the position of the inner pipe liquid inlet hole 15 above the upper seal 303 of the plugging device 24. At this time, the oil in the middle oil layer 52 and the lower oil layer 53 cannot enter the plug 14. The oil in the upper oil layer 51 enters the plug 14 through the upper end opening of the releasing tool 21 and the inner pipe liquid inlet hole 15 on the plug 14, and is connected to the oil pump 13 to realize the exploitation of the upper oil layer 51.

[0056] ④ Pull out the plug 14 completely to realize the combined exploitation of the upper oil layer 51, the middle oil layer 52, and the lower oil layer 53.

[0057] When the plugging and water finding pipe string of the present utility model is applied, only by lifting and lowering the inner pipe string to adjust the position of the inner pipe liquid inlet hole relative to the upper and lower seals in the plugging device, the layered exploitation of the three oil layers can be realized. The plugging device is an integral part. Compared with the structure of the releasing pipe string in the prior art that requires the configuration and connection of two sealing devices, the structure of the releasing pipe string can be made more compact, and the connection operation is more convenient. Moreover, after the plugging device is assembled, it is located between the upper and lower packers. In this way, when changing the exploited layer section, the plug of the inner pipe string does not need to pass through a long distance, as long as it can pass through the upper seal and the lower seal. Therefore, the length of the plug does not need to be very long to meet the requirements of three-layer layered exploitation, and the length of the plug is significantly shortened. The shortened plug is not prone to bending deformation when inserted into the well, thus ensuring the smooth implementation of the mechanical plugging and water finding process.

[0058] In addition, the tool outer diameter of the plugging and water finding pipe string of the present utility model is small. The packer used is a small-diameter high-expansion ratio packer, and the expansion ratio can reach 1.3 - 1.5. The connector used is a small-diameter connector. The small tool outer diameter makes the plugging and water finding pipe string of the present utility model applicable not only to conventional wells, but also to casing deformation and diameter reduction wells, and casing partial patch and diameter reduction wells. It can pass through the casing deformation and diameter reduction section to find and plug water for the lower large casing. Compared with the existing plugging and water finding pipe string, the applicable range is wider.

[0059] In other embodiments of the plugging and water finding pipe string, the sealing cylinder of the plugging device can also be of other structures. For example, the sealing cylinder is divided into two sections. The upper section of the sealing cylinder is provided with an upper seal, the lower section of the sealing cylinder is provided with a lower seal, and a sealing device liquid inlet hole is provided on the lower section of the sealing cylinder, and the sealing device liquid inlet hole is located above the lower seal; or, the upper section of the sealing cylinder is provided with an upper seal, a sealing device liquid inlet hole is provided on the upper section of the sealing cylinder, the sealing device liquid inlet hole is located below the upper seal, and the lower section of the sealing cylinder is provided with a lower seal.

[0060] In other embodiments of the plugging and water finding pipe string, the adjacent two sections of the sealing cylinder can also be welded or connected by other fixed connection methods, which can be detachable connection or non-detachable connection.

[0061] In other embodiments of the plugging water pipe string with an inserted pipe, the upper seal can also be installed at a position close to the upper end on the inner wall surface of the upper seal cylinder. Of course, the lower seal can also be installed at a position close to the lower end on the inner wall surface of the lower seal cylinder. The position of the stopper is adjusted according to the position of the seal to ensure its stopping and limiting of the seal. At this time, compared with the above-mentioned Embodiment 1, the distance between the upper and lower seals will be relatively farther.

[0062] In other embodiments of the plugging water pipe string with an inserted pipe, the upper stopper and the upper seal cylinder can also be non-detachably connected. For example, they can be welded. Similarly, the lower stopper and the lower seal cylinder can also be non-detachably connected. For example, they can be welded.

[0063] The present utility model also provides an embodiment of an inserted pipe seal. Its specific structure is the same as that of the inserted pipe seal in the above-mentioned embodiment of the plugging water pipe string with an inserted pipe, and will not be elaborated here.

[0064] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. The patent protection scope of the present utility model is subject to the claims. All equivalent structural changes made by using the description and drawings of the present utility model should, by the same token, be included in the protection scope of the present utility model.

Claims

1. A cannula sealer, comprising a sealing cylinder which is passed through from top to bottom, and the sealing cylinder has an inner cavity into which an inner tube column can be inserted, characterized in that: Upper and lower sealing members are arranged at intervals in the sealing cylinder, a sealing device liquid inlet hole connected to the inner cavity is arranged on the sealing cylinder, the sealing device liquid inlet hole is located between the upper and lower sealing members, a sealing sleeve is also fixed in the sealing cylinder by shear nails, the sealing sleeve and the sealing cylinder are sealed to close the sealing device liquid inlet hole, and the sealing sleeve slides down to make way for the sealing device liquid inlet hole after the shear nails are cut.

2. The cannula sealer according to claim 1, characterized in that: The sealing cylinder is a segmented structure, including an upper sealing cylinder, a middle sealing cylinder and a lower sealing cylinder arranged in sequence from top to bottom. The upper sealing member is installed in the upper sealing cylinder, the lower sealing member is installed in the lower sealing cylinder, and the sealer liquid inlet hole is arranged on the middle sealing cylinder.

3. The cannula sealer according to claim 2, characterized in that: The two adjacent sections of the sealing cylinder are detachably connected directly or through an adapter.

4. The cannula sealer according to claim 2, characterized in that: An upper sealing groove is provided on the inner wall surface of the lower end of the upper sealing cylinder, and the upper sealing member is installed in the upper sealing groove. An upper stopper is provided in the upper sealing cylinder, and the upper stopper cooperates with the lower stopper of the upper sealing member to limit the upper sealing member; a lower sealing groove is provided on the inner wall surface of the upper end of the lower sealing cylinder, and the lower sealing member is installed in the lower sealing groove. A lower stopper is provided in the lower sealing cylinder, and the lower stopper cooperates with the upper stopper of the lower sealing member to limit the lower sealing member.

5. The cannula sealer according to claim 4, characterized in that: The upper stopper is detachably connected to the upper sealing cylinder, and the lower stopper is detachably connected to the lower sealing cylinder.

6. The cannula sealer according to claim 5, characterized in that: The upper stopper is an upper stop ring, and the lower stopper is a lower stop ring.

7. The cannula sealer according to claim 2, characterized in that: The middle sealing cylinder is a screen tube, and the screen holes on the screen tube constitute the liquid inlet hole of the sealer.

8. The cannula sealer according to any one of claims 1 to 7, characterized in that: The inner wall surface of the upper end of the sealing cylinder is provided with a guiding cone surface for guiding the insertion of the inner tube column.

9. A pipe string for plugging water, comprising an outer pipe and an inner pipe string, wherein the outer pipe has a central channel, the outer pipe comprises a connecting pipe, upper and lower packers and a pipe sealer, the two packers divide the outer pipe into three sections: upper, middle and lower, each section of the outer pipe is provided with an oil inlet channel connected to the central channel, the inner pipe string has a central channel inside, the inner pipe string comprises a pipe with a closed lower end, the pipe is provided with an inner pipe liquid inlet hole connected to the central channel, and the characteristics are as follows: The cannula sealer is the cannula sealer as described in any one of claims 1 to 8. The cannula sealer is located between the upper and lower sealers. The sealer liquid inlet hole constitutes the middle oil inlet channel of the outer tube. The cannula is provided with sealing fitting sections on the upper and lower sides of the inner tube liquid inlet hole for forming a sealing fit with the upper and lower seals.

10. The pipe column for finding water blocking by inserting pipe according to claim 9, characterized in that: The bottom of the outer tube of the hand release is blocked, and a communicating vessel is connected to the lower section of the outer tube of the hand release, the communicating vessel includes a communicating vessel body, the inside of the communicating vessel body is provided with a pressure transmission channel, the communicating vessel body is provided with a pressure transmission hole connected to the pressure transmission channel, a sliding sleeve is fixed to the outside of the communicating vessel body by a pin, the sliding sleeve and the communicating vessel body are sealed to close the pressure transmission hole, and after the pin is cut off, the sliding sleeve slides down to make way for the pressure transmission hole, and the pressure transmission hole constitutes the lower section of the oil inlet channel of the outer tube of the hand release.

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