Insertion pipe control water finding and plugging pipe column

Abstract

The utility model discloses an inserting pipe control water finding and plugging pipe column, and relates to the technical field of oil field mechanical exploitation water finding and plugging. The inserting pipe control water finding and plugging pipe column comprises a releasing pipe and an inserting pipe, the releasing pipe is provided with a central channel allowing the inserting pipe to enter, a packer is arranged on the releasing pipe, the releasing pipe is divided into at least three sections by the packer, at least three oil production layers are separated out at the same time, and the releasing pipe is provided with oil inlet channels communicated with all the oil production layers; at least two liquid inlet holes are formed in the insertion pipe and distributed front and back, and an inner cavity of the releasing pipe is communicated with the interior of the insertion pipe through the liquid inlet holes. The releasing pipe is provided with a sealer matched with the inserting pipe in a sealing mode, and the sealer and the packer are arranged in a staggered mode. The liquid inlet holes and the sealers are arranged in a staggered mode so that oil extraction can be conducted on corresponding oil extraction layers. The sealing device is arranged on the releasing pipe, it is guaranteed that the sealing structure is not in contact friction with the shaft wall in the process that the inserting pipe descends into a well, and the sealing reliability is improved; meanwhile, the water finding and plugging pipe column can achieve commingling production of the potential layer, the construction success rate is high, and the validity period is long.

Description

Technical Field

[0001] This utility model relates to the field of water plugging technology in oilfield mechanical mining, specifically to a pipe insertion control water plugging string. Background Technology

[0002] During the development of oilfields, especially in the later stages of water injection development, the overall water cut gradually increases, and the contradictions between layers become more and more prominent. In order to understand the oil layers and stabilize oil production and control water, water plugging operations are often carried out by inserting tubing strings.

[0003] In existing technologies, the tubing used for water plugging and plugging has a sealing assembly on the outer periphery of the tubing. This sealing assembly is prone to damage due to friction with the wellbore wall during the running of the inner tubing, which can lead to failure in water plugging and plugging. In addition, when performing oil production in multiple oil-producing layers, existing technologies typically use a single-layer production method. When each oil-producing layer is a potential layer, it is necessary to repeatedly pull out the downhole water plugging and plugging tubing and run it again for production. Alternatively, multiple independent tubing may be used to achieve oil production in each oil-producing layer, resulting in long operation periods, high costs, and high production losses. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a tubing string for controlling water plugging, which solves the problem that the sealing ring on the outer periphery of the tubing in existing tubing strings is easily damaged by friction with the wellbore wall during the inner tube's lowering process, leading to failure in water plugging. It also solves the problem that existing tubing strings for water plugging cannot achieve combined mining of potential layers.

[0005] The technical solution adopted by this utility model is a pipe insertion control pipe for finding blocked water pipes, including a release pipe and a pipe, wherein the release pipe is provided with a central channel for the pipe insertion to enter;

[0006] The drop pipe is equipped with a packer, which is used to divide the drop pipe into at least three sections and separate at least three oil production layers. The drop pipe is also equipped with an oil inlet channel that communicates with each of the oil production layers.

[0007] The cannula is provided with at least two liquid inlet holes, which are distributed one in front of the other. The inner cavity of the drop tube is connected to the inside of the cannula through the liquid inlet holes.

[0008] The drop tube is equipped with a sealer that seals with the insertion tube, and the sealer is offset from the packer.

[0009] The inlet hole is offset from the seal to enable oil production in the corresponding oil-producing layer.

[0010] This invention improves sealing reliability by installing a sealer on the drop pipe to ensure that the sealing structure does not come into contact with or rub against the well wall during the insertion and running of the pipe. At the same time, the water-blocking tubing string can achieve combined mining of potential layers, with a high success rate and long service life.

[0011] In a preferred embodiment of this utility model, the number of packers is consistent with the number of sealers, which can reduce the number of sealing structures and save costs.

[0012] In a preferred embodiment of this utility model, the packer includes a first packer and a second packer, and the sealer includes a first sealer and a second sealer. The first packer is located between the first sealer and the second sealer, and the second sealer is located between the first packer and the second packer.

[0013] In an optional embodiment of this utility model, the distance between the first seal and the second seal is greater than the distance between the two liquid inlet holes.

[0014] In a further embodiment of this invention, when both inlet holes are located at the front end of the first seal, the insertion tube can extract oil from the first oil-producing layer; when the two inlet holes are located on both sides of the first seal, the insertion tube can extract oil from both the first and second oil-producing layers; when the two inlet holes are located between the first and second seals, the insertion tube can extract oil from the second oil-producing layer; when the two inlet holes are located on both sides of the second seal, the insertion tube can extract oil from both the second and third oil-producing layers; and when both inlet holes are located at the rear end of the second seal, the insertion tube can extract oil from the third oil-producing layer.

[0015] In an optional embodiment of this utility model, the distance between the first seal and the second seal is less than the distance between the two liquid inlet holes.

[0016] In a preferred embodiment of this utility model, the cannula includes at least a first cannula unit and a second cannula unit detachably connected to the first cannula unit. The first cannula unit and the second cannula unit have the same diameter, and the two liquid inlet holes are provided on the first cannula unit.

[0017] In a preferred embodiment of this utility model, the sealer includes an annular seal, which is disposed in the inner hole of the sealer; a guide sleeve is provided in the inner hole, and a front guide section, a guide cone surface, and a rear guide section are provided on the inner circumferential surface of the guide sleeve. The inner diameter of the front guide section is larger than the inner diameter of the rear guide section, and the inner diameter of the rear guide section is larger than the inner diameter of the annular seal.

[0018] In a further embodiment of this utility model, the annular seal includes an annular bracket and a rubber sealing ring, the rubber sealing ring being disposed on the inner circumferential surface of the annular bracket; the rubber sealing ring is bonded to the annular groove on the inner circumferential surface of the annular bracket by vulcanization, the annular bracket being a vulcanized steel component, and the rubber sealing ring being a vulcanized rubber component.

[0019] In a preferred embodiment of this utility model, a lateral flow valve is provided on the oil inlet channel between the first packer and the second packer.

[0020] Beneficial effects: By installing a sealer on the drop pipe, this utility model ensures that the sealing structure does not come into contact with or rub against the well wall during the insertion and lowering of the inner pipe, thus improving the reliability of the seal. At the same time, the water-blocking tubing string can achieve combined mining of potential layers, with a high success rate and long effective period.

[0021] Other beneficial effects are described in detail in the specific implementation methods. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a pipe column for controlling the insertion of a tube to locate and block the water pipe, according to an embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the cannula structure in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the sealer in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the oil extraction state when the distance between the first and second sealers in this utility model is greater than the distance between the two inlet holes;

[0026] Figure 5 This is a schematic diagram of the oil production state when the distance between the first sealer and the second sealer is less than the distance between the two inlet holes in this utility model.

[0027] exist Figures 1-5In the diagram, 1. Oil pump; 2. Anchor; 3. Pipe; 31. Cone; 32. First pipe unit; 33. Connecting joint; 34. Second pipe unit; 35. First inlet port; 36. Second inlet port; 4. Release device; 5. First sealer; 51. Upper connector; 511. Inner flange; 52. Guide sleeve; 521. Upper guide section; 522. Lower guide section; 523. Guide cone surface; 524. Outer flange; 53. Annular support; 531. Outer sealing ring groove; 54. Rubber sealing ring; 55. Lower connector; 6. First packer; 7. Lateral check valve; 8. Second sealer; 9. Second packer; 10. Sealing ball seat; 100. Casing; 101. First oil production layer; 102. Second oil production layer; 103. Third oil production layer. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "front and back", "front end" and "rear end" of the first feature and the second feature include the first feature being directly in front of and diagonally in front of the second feature, or the first feature being directly behind and diagonally behind the second feature, or simply indicating the relative positional relationship between the first feature and the second feature. It can be a horizontal positional relationship or a vertical positional relationship, rather than a front-back relationship.

[0030] In addition, unless otherwise expressly specified and limited, the terms "first", "second" and "third" in this utility model are used only to distinguish the same feature in order to facilitate understanding of the solution adopted in this utility model.

[0031] The existing technology of insertion tubing for finding and plugging water can be seen in the "Three-Layer Oil Production Water Pluging Tubing" disclosed in patent document CN210919029U. This water plugging tubing includes a drop-out outer tube and an inner tube. The drop-out outer tube has a central channel for inserting the inner tube. The drop-out outer tube includes two packers distributed vertically: an upper packer and a lower packer. The two packers are used to divide the drop-out outer tube into an upper section, a middle section, and a lower section, and simultaneously separate three oil production layers: an upper oil production layer, a middle oil production layer, and a lower oil production layer. Each section of the drop-out outer tube has an oil inlet channel connecting each oil production layer to the central channel. The inner tube includes four sealed tubes distributed vertically: No. 1 to No. 4. A central channel is located within the inner tube, housing an oil pump. The inner tube also includes a screen tube positioned between No. 2 and No. 3. The screen tube's through-hole forms an inner tube inlet port communicating with the central channel. The outer tube contains two outer sealing cylinders located within the central channel, designed to mate with the sealed tubes: an upper outer sealing cylinder and a lower outer sealing cylinder. Specifically, a sealing assembly including a sealing ring is located on the outer circumference of the sealed tube, while the outer sealing cylinder has an inner circumferential surface for sealing with the sealing ring. In use, raising and lowering the inner tube changes the position of the screen tube within the central channel and the corresponding sealing fit between the sealed tube and the outer sealing cylinder. This allows for the extraction of designated oil layers from the upper, middle, and lower oil layers, as well as the sealing of designated oil layers from the upper, middle, and lower oil layers. In practice, it has been found that the sealing rings around the four sealing pipes are easily damaged by friction against the wellbore wall during the well running process, leading to the failure of water plugging. Furthermore, the "insertion pipe water plugging string" disclosed in patent document CN220151317U cannot achieve combined production of upper and middle layers, or middle and lower layers. After the single-layer identification is completed, if both the upper and middle layers are potential layers, or both the middle and lower layers are potential layers, or both the upper and lower layers are potential layers, the downhole water plugging string must be retrieved and re-inserted for production, resulting in long operation periods, high costs, and significant production losses.

[0032] To address this, the present invention provides a water-blocking tubing string for insertion control, comprising a drop tube and an insertion tube 3. The drop tube has a central channel for the insertion tube 3 to enter, and two packers are provided on the drop tube to divide it into upper, middle, and lower sections, simultaneously separating three oil-producing layers. The drop tube also has an oil inlet channel communicating with each oil-producing layer. The insertion tube 3 has at least two inlet holes, distributed front and rear, with the inner cavity of the drop tube communicating with the interior of the insertion tube 3 through the inlet holes. The drop tube has a sealer that seals with the insertion tube 3, and the sealer is offset from the packers. The offset arrangement of the inlet holes and the sealer allows for oil production from the corresponding oil-producing layer. By providing a sealer on the drop tube, the present invention ensures that the sealing structure does not come into contact with or rub against the wellbore wall during the insertion tube 3's insertion into the well, thus improving sealing reliability. Simultaneously, the water-blocking tubing string enables combined production of potential layers, with a high success rate and long effective period.

[0033] It is worth noting that the two liquid inlet holes provided on the cannula 3 are liquid inlet holes in a broad sense. Each liquid inlet hole can be an elongated hole or a set of holes composed of multiple holes.

[0034] In a preferred embodiment of this utility model, the number of packers is consistent with the number of sealers. For example, two packers and sealers are used simultaneously to separate the oil-producing layer into three oil-producing layers corresponding to each section of the drop pipe: the first oil-producing layer 101, the second oil-producing layer 102, and the third oil-producing layer 103. Alternatively, three packers and sealers are used simultaneously to separate the oil-producing layer into four oil-producing layers corresponding to each section of the drop pipe: the first oil-producing layer, the second oil-producing layer, the third oil-producing layer, and the fourth oil-producing layer. The number of packers and sealers is selected and set according to the reservoir characteristics, and this utility model does not impose a specific limitation on this.

[0035] In a preferred embodiment of this utility model, the packer includes a first packer 6 and a second packer 9, and the sealer includes a first sealer 5 and a second sealer 8. The first packer 6 is located between the first sealer 5 and the second sealer 8, and the second sealer 8 is located between the first packer 6 and the second packer 9. Thus, after the insertion tube 3 enters the central channel, the first oil-producing layer 101, the second oil-producing layer 102, and the third oil-producing layer 103 are respectively formed into three independent oil-gathering spaces in the central channel. Combined with the two liquid inlet holes provided on the insertion tube 3, it is possible to individually extract oil from the first oil-producing layer 101, the second oil-producing layer 102, and the third oil-producing layer 103, or to jointly extract oil from the first oil-producing layer 101 and the second oil-producing layer 102, the second oil-producing layer 102 and the third oil-producing layer 103, or the first oil-producing layer 101 and the third oil-producing layer 103.

[0036] In one optional embodiment of this utility model, the distance between the first seal 5 and the second seal 8 is greater than the distance between the two liquid inlet holes.

[0037] At this point, the position of the insertion tube 3 is adjusted. When both inlet holes are located at the front end of the first sealer 5, the insertion tube 3 can extract oil from the first oil-producing layer 101. When the two inlet holes are located on both sides of the first sealer 5, the insertion tube 3 can extract oil from both the first oil-producing layer 101 and the second oil-producing layer 102. When the two inlet holes are located between the first sealer 5 and the second sealer 8, the insertion tube 3 can extract oil from the second oil-producing layer 102. When the two inlet holes are located on both sides of the second sealer 8, the insertion tube 3 can extract oil from both the second oil-producing layer 102 and the third oil-producing layer 103. When both inlet holes are located at the rear end of the second sealer 8, the insertion tube 3 can extract oil from the third oil-producing layer 103.

[0038] In another optional embodiment of this utility model, the distance between the first seal 5 and the second seal 8 is less than the distance between the two liquid inlet holes.

[0039] At this time, the position of the insertion tube 3 is adjusted. When both inlet holes are located at the front end of the first sealer 5, the insertion tube 3 can extract oil from the first oil-producing layer 101. When the first sealer 5 and the second sealer 8 are located between the two inlet holes, the insertion tube 3 can extract oil from the first oil-producing layer 101 and the third oil-producing layer 103 together. When both inlet holes are located at the rear end of the second sealer 8, the insertion tube 3 can extract oil from the third oil-producing layer 103.

[0040] In a preferred embodiment of this utility model, the insertion tube 3 includes at least a first insertion tube unit 32 and a second insertion tube unit 34 detachably connected to the first insertion tube unit 32. The first insertion tube unit 32 and the second insertion tube unit 34 have the same diameter, and two liquid inlet holes are provided on the first insertion tube unit 32.

[0041] In a preferred embodiment of this utility model, the sealer includes an annular seal element disposed within the inner hole of the sealer. A guide sleeve 52 is provided within the inner hole. The inner circumferential surface of the guide sleeve 52 has a front guide section, a guide cone surface 523, and a rear guide section. The inner diameter of the front guide section is larger than the inner diameter of the rear guide section, and the inner diameter of the rear guide section is larger than the inner diameter of the annular seal element. Thus, when the insertion tube 3 is inserted, the guide cone surface 523, being larger at the top and smaller at the bottom, guides the insertion tube 3 entering the guide sleeve 52 towards the center, thus protecting the annular seal element.

[0042] In a further embodiment of this invention, the annular seal includes an annular bracket 53 and a rubber sealing ring 54, with the rubber sealing ring 54 disposed on the inner circumferential surface of the annular bracket 53. The rubber sealing ring 54 is bonded to the annular groove on the inner circumferential surface of the annular bracket 53 by vulcanization. The annular bracket 53 is made of vulcanized steel, and the rubber sealing ring 54 is made of vulcanized rubber. When the insertion tube 3 is raised or lowered, under the condition of a pressure difference between the upper and lower sides of the rubber sealing ring 54, the rubber sealing ring 54 is less likely to fall off and be damaged, thus extending its service life.

[0043] In a preferred embodiment of this utility model, a lateral flow valve 7 is provided on the oil inlet channel between the first packer 6 and the second packer 9.

[0044] Example

[0045] For ease of understanding, the following is a description of the use of a tubing string for controlling water plugging in a reservoir, provided by this utility model. Based on the characteristics of the reservoir, the reservoir is divided into three oil-producing layers, upper and lower.

[0046] In this embodiment, the tubing string for controlling water plugging includes a drop tube, which is used to fix the casing 100 of the oil well. The drop tube has a central channel for inserting the inner tube, and the insertion tube 3 is used to be inserted into the drop tube.

[0047] The drop pipe includes two packers distributed vertically: a first packer 6 and a second packer 9. The first packer 6 and the second packer 9 are connected in series via a connecting pipe. The two packers are sealed to the casing 100, thus dividing the drop pipe into upper, middle, and lower sections from the outside, and simultaneously separating the oil-producing layers into three corresponding oil-producing layers: a first oil-producing layer 101, a second oil-producing layer 102, and a third oil-producing layer 103. Each section of the drop pipe is provided with an oil inlet channel: a first oil inlet channel, a second oil inlet channel, and a third oil inlet channel. Each oil inlet channel is used to connect the corresponding oil-producing layer of each section of the drop pipe to the central channel. The drop pipe also includes a drop device 4, a side-flow valve 7, and a seated ball seat 10. The drop device 4, the side-flow valve 7, and the seated ball seat 10 are all existing technologies, and their specific structures will not be described in detail in this utility model.

[0048] The drop tube also includes a seal for sealing with the insertion tube 3: a first seal 5 and a second seal 8. The seals are provided with annular seals: an upper annular seal installed in the first seal 5 and a lower annular seal installed in the second seal 8. The first seal 5 and the second seal 8 are respectively located on the upper and lower sides of the first packer 6 (this is the optimal solution, but they can also be located between the first packer 6 and the second packer 9). The first oil inlet channel is located above the first seal 5, and the third oil inlet channel is located below the second seal 8. In this embodiment, the second oil inlet channel is a lateral check valve 7 located between the first packer 6 and the second seal 8. At the same time, the lateral check valve 7 must be located between the first packer 6 and the second seal 8.

[0049] The distance between the first sealer 5 and the second sealer 8 shall not be less than the distance between the first liquid inlet hole 35 of the insertion tube 3 and the second liquid inlet hole 36 of the insertion tube 3 + 2 meters, and the distance between the second sealer 8 and the seat ball seat 10 shall not be less than the distance between the first liquid inlet hole 35 of the insertion tube 3 and the cone head 31 + 2 meters.

[0050] The inner tube has a central channel, which serves as an oil extraction channel. An oil pump 1 is installed in the central channel. The inner tube includes an anchor 2 and an insert 3 located at the lower end of the inner tube. The bottom end of the insert 3 is closed. The insert 3 has a first liquid inlet 35 and a second liquid inlet 36 that communicate with the central channel.

[0051] The insertion tube 3 is a hollow tube. The insertion tube 3 has sealing sections formed by smooth outer walls of equal outer diameter on the upper and lower sides of the first liquid inlet hole 35 and the second liquid inlet hole 36. The sealing sections include an upper sealing section and a lower sealing section. The sealing sections of the insertion tube 3 are sealed with the annular seals in the first sealer 5 and the second sealer 8 through circumferential sealing. When the inner tube is lifted and lowered, the sealing sections are used to cooperate with the annular seals in the first sealer 5 and the second sealer 8 (the annular seals are divided into a first annular seal installed in the first sealer 5 and a second annular seal installed in the second sealer 8) to seal and separate the oil production layers on both sides of the packer of the corresponding release tube. In this embodiment, the insertion tube 3 is formed by connecting the second insertion tube unit 34, the connecting section 33, and the first insertion tube unit 32 from bottom to top. The lower end of the second insertion tube unit 34 is provided with a cone head 31. The first liquid inlet hole 35 and the second liquid inlet hole 36 are opened on the first insertion tube unit 32, and are arranged vertically at intervals. The distance between the first liquid inlet hole 35 and the second liquid inlet hole 36 is 2 meters, and the distance is not less than 2 meters, so that the first liquid inlet hole 35 is on the upper part of the seal and the second liquid inlet hole 36 is on the lower part of the seal. The length from the second liquid inlet hole 36 to the lower end of the second insertion tube unit 34 is not less than the distance between the first seal 5 and the second seal 8. The length from the first liquid inlet hole 35 to the upper end of the first insertion tube unit 32 is not less than the distance from the release device 4 to the lower boundary of the second seal 8 + 1 meter.

[0052] The seal includes an upper connector 51 and a lower connector 55, both of which are hollow tubular and form an inner bore within the seal. This inner bore serves as part of the central channel in the outer tube and can be penetrated by the insert tube 3. The upper end of the upper connector 51 has an internal thread for connection with the connecting tube, and the lower end of the lower connector 55 has an external thread for connection with the connecting tube. The lower end of the upper connector 51 and the upper end of the lower connector 55 are connected by threads. The lower end of the upper connector 51 has an internal thread, and the upper end of the lower connector 55 has an external thread. The upper end of the lower connector 55 is inserted into the lower end of the upper connector 51 to achieve a threaded fit. A guide sleeve 52 is provided in the inner bore of the seal, and an annular seal is disposed in the inner bore of the seal, with the guide sleeve 52 positioned above the annular seal.

[0053] Both the guide sleeve 52 and the annular seal are located within the lower connector 55. The outer circumferential surface of the guide sleeve 52 is provided with an outer retaining edge 524, and the interior of the upper connector 51 is provided with an inwardly protruding inner retaining edge 511. The outer retaining edge 524 is clamped between the lower end face of the inner retaining edge 511 of the upper connector 51 and the upper end face of the lower connector 55, thus fixing the guide sleeve 52. The inner circumferential surface of the inner retaining edge 511 of the upper connector 51 is provided with a chamfer that slopes from top to bottom and from the outside inward. The chamfer is located above the inner circumferential surface of the guide sleeve 52. The chamfer is used to guide and straighten the inner tube before it enters the guide sleeve 52, facilitating the entry of the inner tube into the guide sleeve 52.

[0054] The inner circumferential surface of the guide sleeve 52 is provided with an upper guide section 521, a guide cone surface 523, and a lower guide section 522 distributed vertically. The inner diameter of the upper guide section 521 is larger than that of the lower guide section 522, and the inner diameter of the lower guide section 522 is larger than that of the upper annular seal. The guide cone surface 523 is larger at the top and smaller at the bottom, and is used to straighten and guide the inner tube entering the guide sleeve 52 towards the center, which is beneficial for the inner tube to enter the upper annular seal.

[0055] The annular seal includes an annular bracket 53 and a rubber sealing ring 54. The rubber sealing ring 54 is disposed on the inner circumferential surface of the annular bracket 53. In this embodiment, the rubber sealing ring 54 is bonded to the annular groove on the inner circumferential surface of the annular bracket 53 by vulcanization. Thus, the annular bracket 53 is a vulcanized steel part, and the rubber sealing ring 54 is a vulcanized rubber. The rubber sealing ring 54 is tightly adhered to the inner circumferential surface of the annular bracket 53. When the insertion tube 3 is lifted or lowered, under the condition of a pressure difference between the upper and lower sides of the rubber sealing ring 54, the rubber sealing ring 54 is not easily detached or damaged, thus extending its service life. The outer circumferential surface of the annular bracket 53 is provided with an outer sealing ring groove 531, in which a sealing ring that seals with the inner circumferential surface of the lower connector 55 is installed.

[0056] The working principle of the sealer is as follows: When the insert tube 3 is inserted into the sealer, the insert tube 3 passes through the upper connector 51 and the guide sleeve 52 and enters the annular seal. After the sealing mating section of the insert tube 3 contacts the rubber sealing ring 54 of the annular seal, a seal is achieved, which separates the upper and lower sides of the annular seal inside the sealer into two sealing pressure systems. When the insert tube 3 is pulled out of the sealer, the sealer becomes a single pressure system.

[0057] When the above-described embodiment of the tube-controlled water blockage-finding pipe string of this utility model is used, after the tube 3 is inserted into the first seal 5 and the second seal 8, it has the following working modes:

[0058] (a) When the first inlet hole 35 and the second inlet hole 36 are both located below the second sealer 8, the sealing section above the first inlet hole 35 is sealed and fitted with the second sealer 8 to produce oil from the third oil production layer 103.

[0059] (b) The first inlet hole 35 is located above the second seal 8 (at this time, the first inlet hole 35 is located below the first seal 5), the second inlet hole 36 is located below the second seal 8, and the sealing section above the first inlet hole 35 is sealed and fitted with the first seal 5 to simultaneously produce oil from the second oil production layer 102 and the third oil production layer 103.

[0060] (c) When the first inlet hole 35 and the second inlet hole 36 are simultaneously located between the first sealer 5 and the second sealer 8, the sealing section above the first inlet hole 35 of the insertion tube 3 is sealed with the first sealer 5, and the sealing section below the second inlet hole 36 is sealed with the second sealer 8, thereby producing oil for the second oil production layer 102.

[0061] (d) When the first inlet hole 35 and the second inlet hole 36 are both above the first sealer 5, the sealing section above the second inlet hole 36 is sealed and fitted with the first sealer 5, and oil is extracted from the first oil production layer 101.

[0062] (e) The first inlet hole 35 is located above the first sealer 5, and the second inlet hole 36 is located below the first sealer 5. The sealing section below the second inlet hole 36 is sealed and fitted with the second sealer 8, so that oil can be extracted from the second oil production layer 102 and the first oil production layer 101 at the same time.

[0063] In addition, in the above embodiment, the first packer 6 on the drop pipe is a Y445 water-blocking packer, and the second packer 9 is a Y341 water-blocking packer. In other embodiments of this utility model, the two packers can also be replaced with other common combinations according to actual needs.

[0064] In addition, in other embodiments of this utility model, the three-segment cannula 3 in the above embodiments can also be a two-segment structure. Embodiments formed by simple substitutions or obvious modifications listed above or similarly also belong to embodiments of the technical solution of this utility model.

Claims

1. A pipe-controlled water blockage locating column, comprising a release pipe and a pipe (3), wherein the release pipe is provided with a central channel for the pipe (3) to enter, characterized in that, The drop pipe is equipped with a packer, which is used to divide the drop pipe into at least three sections and separate at least three oil production layers. The drop pipe is also equipped with an oil inlet channel that communicates with each of the oil production layers. The insertion tube (3) is provided with at least two liquid inlet holes, which are distributed one in front of the other. The inner cavity of the drop tube is connected to the inside of the insertion tube (3) through the liquid inlet holes. The drop tube is provided with a sealer that seals with the insertion tube (3), and the sealer is offset from the packer; The inlet hole is offset from the seal to enable oil production in the corresponding oil-producing layer.

2. The tube insertion control water blockage finding string according to claim 1, characterized in that, The number of packers is consistent with the number of sealers.

3. The tube insertion control water blockage finding string according to claim 2, characterized in that, The packer includes a first packer (6) and a second packer (9), and the sealer includes a first sealer (5) and a second sealer (8). The first packer (6) is located between the first sealer (5) and the second sealer (8), and the second sealer (8) is located between the first packer (6) and the second packer (9).

4. The tube insertion control water blockage finding string according to claim 3, characterized in that, The distance between the first seal (5) and the second seal (8) is greater than the distance between the two liquid inlet holes.

5. The tube insertion control pipe string for locating and blocking water as described in claim 4, characterized in that, When both inlet holes are located at the front end of the first seal (5), the insertion tube (3) can extract oil from the first oil-producing layer (101); when the two inlet holes are located on both sides of the first seal (5), the insertion tube (3) can extract oil from both the first oil-producing layer (101) and the second oil-producing layer (102); when the two inlet holes are located between the first seal (5) and the second seal (8), the insertion tube (3) can extract oil from the second oil-producing layer (102); when the two inlet holes are located on both sides of the second seal (8), the insertion tube (3) can extract oil from both the second oil-producing layer (102) and the third oil-producing layer (103); when both inlet holes are located at the rear end of the second seal (8), the insertion tube (3) can extract oil from the third oil-producing layer (103).

6. The tube insertion control water blockage finding string according to claim 3, characterized in that, The distance between the first seal (5) and the second seal (8) is less than the distance between the two liquid inlet holes.

7. The tube insertion control pipe string for locating and blocking water as described in claim 1, characterized in that, The cannula (3) includes at least a first cannula unit (32) and a second cannula unit (34) detachably connected to the first cannula unit (32). The first cannula unit (32) and the second cannula unit (34) have the same diameter, and the two liquid inlet holes are provided on the first cannula unit (32).

8. The tube insertion control pipe string for locating and blocking water pipes according to claim 1, characterized in that, The sealer includes an annular seal, which is disposed in the inner hole of the sealer; a guide sleeve (52) is provided in the inner hole, and a front guide section, a guide cone surface (523), and a rear guide section are provided on the inner circumferential surface of the guide sleeve (52). The inner diameter of the front guide section is larger than the inner diameter of the rear guide section, and the inner diameter of the rear guide section is larger than the inner diameter of the annular seal.

9. The tube insertion control pipe string for locating and blocking water pipes according to claim 8, characterized in that, The annular seal includes an annular bracket (53) and a rubber sealing ring (54). The rubber sealing ring (54) is disposed on the inner circumferential surface of the annular bracket (53). The rubber sealing ring (54) is joined to the annular groove on the inner circumferential surface of the annular bracket (53) by vulcanization. The annular bracket (53) is a vulcanized steel part, and the rubber sealing ring (54) is a vulcanized rubber.

10. The tube insertion control water blockage finding string according to claim 3, characterized in that, A lateral check valve (7) is provided on the oil inlet channel between the first packer (6) and the second packer (9).

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