A water control tool assembly used for oil well segmented filling layers

Abstract

The present invention discloses a water control tool assembly used between segmented filling layers of oil wells, which solves the technical problem of difficulty in achieving fine water control production between layers during oil well production. The water control tool assembly is used to be arranged between two adjacent double-layer screen tubes. The water control assembly includes a supporting outer tube and an inner tube assembly. The inner tube assembly is coaxially arranged inside the supporting outer tube. The two ends of the supporting outer tube are respectively used to connect with the outer layer of the double-layer screen tube, and the two ends of the inner tube assembly are respectively used to connect with the inner layer of the double-layer screen tube, and an annular flow channel is formed between the inner tube assembly and the supporting outer tube; the inner tube assembly includes a rubber tube base tube, an AICD water control short section and a circulating sleeve. The rubber tube base tube is connected to the supporting outer tube through a supporting portion. A sealing rubber tube is provided on the rubber tube base tube, and the sealing rubber tube is used to be sealed between the rubber tube base tube and the supporting outer tube. The present invention can ensure fine water control production between layers during normal production of oil wells.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas well production and development, and in particular relates to a water control tool assembly used between segmented filling layers of an oil well. Background Art

[0002] The development of marine oil and gas resources is a hot topic and focus of the current development of the world's marine economy. Marine oil and gas resources are not only abundant, but modern science and technology have also enabled them to be developed with great capabilities. The marine oil and gas industry has developed into an emerging and high-value-added leading industry in the marine economy.

[0003] Currently, offshore oil wells, especially openhole horizontal wells, suffer from high water cuts, making them challenging to manage. Existing technologies typically use bypass isolation packers to pack the openhole in sections, with double-layer screens and AICD valves placed between the sections to control water production.

[0004] However, after the oil well is segmented, the layers between the layers have uneven liquid production positions and different water contents. Liquids with different positions and different water contents between the layers all enter the annulus between the screen jacket and the base pipe, and after being generally mixed, enter the AICD valve. This loses the objective condition for the AICD valve to sensitively respond to liquids with different water contents, making it impossible to achieve fine water control in this layer, which needs to be improved. Summary of the Invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a water control tool assembly for use in segmented filling layers of oil wells, which can realize refined water control production between layers.

[0006] The present invention provides a water control tool assembly for use between segmented filling layers of an oil well. The water control tool assembly is used to be arranged between two adjacent double-layer screen pipes. The water control assembly includes a vertically arranged supporting outer cylinder and an inner tube assembly. The inner tube assembly is coaxially arranged inside the supporting outer cylinder. The two ends of the supporting outer cylinder are respectively used to connect to the outer layer of the double-layer screen pipe, and the two ends of the inner tube assembly are respectively used to connect to the inner layer of the double-layer screen pipe, and an annular flow channel is formed between the inner tube assembly and the supporting outer cylinder.

[0007] The inner tube assembly includes a rubber tube base tube, an AICD water control short joint and a circulating sleeve connected in sequence from top to bottom. The rubber tube base tube is connected to the supporting outer tube through a supporting part. A sealing rubber tube is provided on the rubber tube base tube, and the sealing rubber tube is used to seal between the rubber tube base tube and the supporting outer tube.

[0008] Optionally, the setting rubber cylinder is a self-expanding rubber cylinder, and is fixed to the middle position of the rubber cylinder base tube by vulcanization, and there is a flow gap between the outer side wall of the setting rubber cylinder and the inner side wall of the supporting outer cylinder.

[0009] Optionally, a circulation hole is provided on the circulation sleeve, and the circulation hole connects the annular flow channel and the interior of the circulation sleeve, and a control unit for controlling the opening and closing of the circulation hole is provided in the circulation sleeve.

[0010] Optionally, the control unit includes:

[0011] A control sleeve is vertically slidably connected to the interior of the circulation sleeve;

[0012] A limiting clamping ring is provided on the control sleeve;

[0013] An opening groove is provided on the inner side wall of the circulating sleeve;

[0014] A closing groove is provided on the inner side wall of the circulating sleeve and is located below the opening groove;

[0015] The vertical movement of the limit snap ring is controlled by an external operating tool. When the limit snap ring is engaged with the opening groove, the circulation hole is exposed to open the circulation hole. When the limit snap ring is engaged with the closing groove, the control sleeve blocks the circulation hole to close the circulation hole.

[0016] Optionally, a support ring groove is provided on the control sleeve, and the limiting clamping ring is C-shaped and partially embedded in the support ring groove.

[0017] Optionally, a plurality of sealing rings are provided between the control sleeve and the circulation sleeve. When the control sleeve blocks the circulation hole and closes the circulation hole, the circulation hole is located between any two adjacent groups of sealing rings.

[0018] Optionally, the support portion includes:

[0019] A connecting ring, fixedly sleeved on the rubber sleeve base tube;

[0020] A support ring is fixedly connected to the inner side wall of the supporting outer cylinder, and the support ring is threadedly matched with the connecting ring;

[0021] There are multiple flow holes, which are respectively arranged through the connecting ring.

[0022] Optionally, plug-in grooves are respectively provided at the two ends of the supporting outer cylinder, and the outer layer of the double-layer screen tube can be plugged into and matched with the supporting outer cylinder.

[0023] Optionally, a conical guide surface is provided at the top end of the rubber-coated base pipe, and a connecting thread is provided on the conical guide surface, so that the rubber-coated base pipe can be connected to the inner thread of the double-layer screen pipe.

[0024] Optionally, a connecting groove is provided at the bottom port of the circulation sleeve, and the outer layer of the double-layer screen pipe can be plugged into and matched with the circulation sleeve.

[0025] As can be seen from the above technical solution, the water control tool assembly provided by the present invention for use between segmented filling layers in oil wells has the following advantages:

[0026] This water control tool assembly can be installed between two adjacent double-layer screens. Multiple double-layer screens and multiple water control tool assemblies can be used to further segment the packing layer, allowing oil from different interlayer locations to pass through the corresponding double-layer screens and enter the water control tool assembly, preventing interlayer oil from mixing, thereby achieving precise interlayer water control production. Simultaneously, this water control tool assembly can improve packing efficiency and effectively increase oil production during the final stage of oil well production. Furthermore, this water control tool assembly has a simple structure, low cost, easy production, and reliable switching, providing excellent guarantees for improving gravel packing efficiency, precise interlayer water control production, and final stage of production liquid extraction.

[0027] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0029] Figure 1 is a cross-sectional view of a water control tool assembly according to an embodiment of the present invention;

[0030] Figure 2 is a cross-sectional view of an inner tube assembly in an embodiment of the present invention;

[0031] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle.

[0032] Description of reference numerals:

[0033] 1. Support outer tube; 2. Inner tube assembly; 21. Rubber tube base tube; 22. AICD water control short joint; 23. Circulation sleeve; 24. Setting rubber tube; 25. Circulation hole; 3. Annular flow channel; 4. Support part; 41. Connecting ring; 42. Support ring; 43. Flow hole; 5. Control part; 51. Control sleeve; 52. Support ring groove; 53. Limiting clamp; 54. Opening groove; 55. Closing groove; 6. Flow gap; 7. Sealing ring; 8. Mounting groove; 9. Plug-in groove; 10. Conical guide surface; 11. Connecting groove. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other in any manner.

[0035] like Figure 1 、 Figure 2 、 Figure 3 The figure shows an embodiment of the present invention, which discloses a water control tool assembly used for segmented filling layers in oil wells. The water control tool assembly is used to be arranged between two adjacent double-layer screen pipes. The water control tool assembly includes a vertically arranged supporting outer cylinder 1, and an inner tube assembly 2 is coaxially arranged inside the supporting outer cylinder 1. The upper and lower ends of the supporting outer cylinder 1 are respectively used to connect with the outer layer of the double-layer screen pipe, and the upper and lower ends of the inner tube assembly 2 are respectively used to connect with the inner layer of the double-layer screen pipe, and an annular flow channel 3 is formed between the inner tube assembly 2 and the supporting outer cylinder 1.

[0036] In one embodiment, Figure 1 、 Figure 2 As shown, the inner tube assembly 2 comprises, from top to bottom, a rubber base tube 21, an AICD water control nipple 22, and a circulation sleeve 23, which are threadedly connected. The rubber base tube 21 is connected to the supporting outer tube 1 via a support portion 4. The top end of the rubber base tube 21 is connected to the inner layer of the double-layer screen tube, while the bottom end of the circulation sleeve 23 is connected to the inner layer of the double-layer screen tube. A setting rubber tube 24 is sleeved on the rubber base tube 21 and is set between the rubber base tube 21 and the supporting outer tube 1 to seal the annulus flow channel 3.

[0037] In one embodiment, Figure 1 、 Figure 2 As shown, a circulation hole 25 is provided on the circulation sleeve 23 , which connects the annular flow channel 3 with the interior of the circulation sleeve 23 , and a control unit 5 for controlling the opening and closing of the circulation hole 25 is provided in the circulation sleeve 23 .

[0038] When the open hole is filled in sections, the control unit 5 controls the circulation hole 25 to open so that the liquid after filling can quickly return, thereby improving the filling efficiency. After the filling is completed, the sealing rubber cylinder 24 is controlled to be sealed between the rubber cylinder base pipe 21 and the supporting outer cylinder 1 to achieve the internal isolation of the tool assembly and finely isolate the filling layer. Subsequently, the control unit 5 controls the circulation hole 25 to close, and then the AICD water control short joint 22 of the layer is used to achieve fine water control production. When the oil well needs to be pumped in the later stage, the control unit 5 can control the circulation hole 25 to open so that the oil can directly enter the inner pipe assembly 2 from the circulation hole 25 to achieve rapid liquid extraction.

[0039] The water control tool assembly in this embodiment can be set between two adjacent double-layer screens, that is, the staff can connect the water control tool assembly between the two adjacent double-layer screens respectively. Since the sealing rubber tube 24 can achieve the blockage of one side of the annular flow channel 3 inside the tool assembly, the cooperation of multiple double-layer screens and multiple water control tool assemblies can achieve the re-segmentation of the filling layer. The oil at different positions between the layers can enter the water control tool assembly through the corresponding double-layer screen and enter the pipeline through the corresponding AICD water control short section 22 to prevent the interlayer oil from mixing, thereby achieving fine water control production between the layers. In addition, by setting the circulation hole 25, the liquid inlet volume is increased, which not only improves the filling efficiency, but also effectively increases the oil production when the oil well is extracted at the end of production.

[0040] In one embodiment, Figure 1 、 Figure 2 As shown, the setting rubber cylinder 24 is a self-expanding rubber cylinder, vulcanized and fixed to the center of the rubber cylinder base tube 21. A flow gap 6 exists between the outer wall of the setting rubber cylinder 24 and the inner wall of the supporting outer cylinder 1. After a period of time following the filling operation, the self-expanding rubber cylinder automatically expands when exposed to oil, water, oil-water, hydrocarbons, and other conditions, achieving automatic sealing within the water control tool assembly. This eliminates the need for manual control of the setting rubber cylinder 24's expansion, improving both operational convenience and efficiency. Since self-expanding rubber cylinders are conventional technology, they will not be described in detail here.

[0041] In one embodiment, Figure 2 、 Figure 3 As shown, the control part 5 includes a control sleeve 51 vertically slidably connected to the inside of the circulating sleeve 23. The side wall of the control sleeve 51 is provided with a support ring 42 groove along its circumference. A C-shaped limiting snap ring 53 is embedded in the groove of the support ring 42. The limiting snap ring 53 can be made of elastic metal material, and the outer edge of the limiting snap ring 53 is exposed outside the groove of the support ring 42.

[0042] In one embodiment, Figure 2 、 Figure 3 As shown, the inner sidewall of the circulation sleeve 23 is provided with an opening slot 54 and a closing slot 55 along its circumference, with the closing slot 55 located below the opening slot 54. By controlling the vertical upward movement of the limiting snap ring 53 using an external operating tool, when the limiting snap ring 53 engages with the opening slot 54, the circulation hole 25 is exposed, thereby opening the circulation hole 25. Similarly, by controlling the vertical downward movement of the limiting snap ring 53 using an external operating tool, when the limiting snap ring 53 engages with the closing slot 55, the control sleeve 51 blocks the circulation hole 25, thereby closing the circulation hole 25.

[0043] In one embodiment, Figure 2 、 Figure 3As shown, multiple groups of sealing rings 7 are arranged between the control sleeve 51 and the circulation sleeve 23. When the control sleeve 51 blocks the circulation hole 25 and closes the circulation hole 25, the circulation hole 25 is located between any two adjacent groups of sealing rings 7 to improve the sealing effect between the control sleeve 51 and the circulation sleeve 23, thereby ensuring the stable sealing of the circulation hole 25.

[0044] In this embodiment, two groups of sealing rings 7 are provided, and each group is provided with two sealing rings. The side wall of the control sleeve 51 is provided with four mounting grooves 8 along its circumference. The four sealing rings 7 are respectively inserted into the corresponding mounting grooves 8, and the sealing rings 7 are tightly abutted against the inner side wall of the circulation sleeve 23 to achieve stable sealing between the control sleeve 51 and the circulation sleeve 23.

[0045] In one embodiment, Figure 1 、 Figure 2 As shown, the support portion 4 includes a connecting ring 41 integrally formed and sleeved onto the rubber sleeve base tube 21. A supporting ring 42 is integrally formed along the inner sidewall of the supporting outer tube 1 along its circumference. The supporting ring 42 is threadedly engaged with the connecting ring 41, thereby achieving a quick and stable connection between the rubber sleeve base tube 21 and the supporting outer tube 1. Furthermore, the connecting ring 41 is provided with multiple flow holes 43, which are evenly spaced along the circumference of the connecting ring 41 to allow liquid to flow through the flow holes 43, ensuring connectivity of the annulus flow channel 3.

[0046] In one embodiment, Figure 1 、 Figure 2 As shown, plug-in grooves 9 are respectively provided at the two ends of the supporting outer tube 1, and the outer layer of the double-layer sieve tube can be inserted into the plug-in grooves 9, that is, the outer layer of the double-layer sieve tube can be plugged into the supporting outer tube 1, thereby realizing quick connection.

[0047] In one embodiment, Figure 1 、 Figure 2 As shown, the top end of the rubber sleeve base tube 21 is integrally formed with a tapered guide surface 10, and the tapered guide surface 10 is provided with a connecting thread, that is, the top end of the rubber sleeve base tube 21 can be inserted into the inner layer of the double-layer screen tube and connected with the inner layer thread of the double-layer screen tube, thereby realizing a stable connection between the rubber sleeve base tube 21 and the double-layer screen tube.

[0048] In one embodiment, Figure 1 、 Figure 2 As shown, a connecting groove 11 is provided at the bottom port of the circulation sleeve 23, and the outer layer of the double-layer screen tube can be inserted into the connecting groove 11, that is, the outer layer of the double-layer screen tube can be plugged into and matched with the circulation sleeve 23, thereby achieving quick connection.

[0049] The water control tool assembly in this embodiment is used as follows:

[0050] One or more water control tool assemblies are installed between two adjacent bypass packers and connected with a double-layer screen. During initial filling, the setting rubber cylinder 24 has not expanded, and a flow gap 6 exists between the outer wall of the setting rubber cylinder 24 and the inner wall of the supporting outer cylinder 1. At this time, the circulation sleeve 23 in this layer is controlled by an external tool to move upward and open the circulation hole 25 to facilitate the rapid return of the filled liquid.

[0051] Some time after the filling operation is complete, the self-expanding rubber cartridge automatically expands when exposed to oil, water, oil-water, or hydrocarbons, effectively isolating the interior of the water control tool assembly. This finely isolates the filling layer into several small segments. Subsequently, the circulation holes 25 in these layers are closed, and precise water control production can be achieved through the AICD water control sub 22 in these segments. When fluid extraction is required later in the well, the circulation holes 25 can be opened to allow the oil to flow directly into the inner tube assembly 2, achieving rapid fluid extraction.

[0052] As can be seen from the above, this device improves filling efficiency, enables precise interlayer water control during normal oil well production, and effectively increases oil production during late-stage fluid extraction. Compared to the original operation process, this water control tool assembly has a simple structure, low cost, easy production, and reliable switching, providing excellent guarantees for improving gravel packing efficiency, precise interlayer water control, and late-stage fluid extraction.

[0053] It should be noted that, unless otherwise specified, the technical or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0054] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A water control tool assembly used in oil well segmented filling layers, characterized by: The water control tool assembly is used to be arranged between two adjacent double-layer screen tubes, and the water control tool assembly comprises a vertically arranged supporting outer cylinder (1) and an inner tube assembly (2). The inner tube assembly (2) is coaxially arranged inside the supporting outer cylinder (1). The two ends of the supporting outer cylinder (1) are respectively used to connect with the outer layer of the double-layer screen tube, and the two ends of the inner tube assembly (2) are respectively used to connect with the inner layer of the double-layer screen tube, and an annular flow channel (3) is formed between the inner tube assembly (2) and the supporting outer cylinder (1). The inner tube assembly (2) comprises a rubber tube base tube (21), an AICD water control nipple (22) and a circulation sleeve (23) connected in sequence from top to bottom. The rubber tube base tube (21) is connected to the supporting outer tube (1) via a supporting portion (4). A sealing rubber tube (24) is sleeved on the rubber tube base tube (21), and the sealing rubber tube (24) is used for sealing between the rubber tube base tube (21) and the supporting outer tube (1).

2. The water control tool assembly according to claim 1, characterized in that: The sealing rubber cylinder (24) is a self-expanding rubber cylinder and is fixed to the middle position of the rubber cylinder base tube (21) by vulcanization, and a flow gap (6) exists between the outer side wall of the sealing rubber cylinder (24) and the inner side wall of the supporting outer cylinder (1).

3. The water control tool assembly according to claim 1, characterized in that: A circulation hole (25) is provided on the circulation sleeve (23), and the circulation hole (25) connects the annular flow channel (3) and the interior of the circulation sleeve (23), and a control unit (5) for controlling the opening and closing of the circulation hole (25) is provided in the circulation sleeve (23).

4. The water control tool assembly according to claim 3, characterized in that: The control unit (5) includes: A control sleeve (51) is vertically slidably connected to the interior of the circulation sleeve (23); A limiting snap ring (53) is provided on the control sleeve (51); An opening groove (54) is provided on the inner side wall of the circulating sleeve (23); A closing groove (55) is provided on the inner side wall of the circulating sleeve (23) and is located below the opening groove (54); The vertical movement of the limiting snap ring (53) is controlled by an external operating tool. When the limiting snap ring (53) is engaged with the opening groove (54), the circulation hole (25) is exposed to open the circulation hole (25). When the limiting snap ring (53) is engaged with the closing groove (55), the control sleeve (51) blocks the circulation hole (25) to close the circulation hole (25).

5. The water control tool assembly according to claim 4, characterized in that: A supporting ring groove (52) is provided on the control sliding sleeve (51), and the limiting clamping ring (53) is C-shaped and partially embedded in the supporting ring groove (52).

6. The water control tool assembly according to claim 4, characterized in that: A plurality of sealing rings (7) are provided between the control sleeve (51) and the circulation sleeve (23). When the control sleeve (51) blocks the circulation hole (25) and closes the circulation hole (25), the circulation hole (25) is located between any two adjacent groups of sealing rings (7).

7. The water control tool assembly according to claim 1, characterized in that: The support portion (4) comprises: A connecting ring (41) is fixedly sleeved on the rubber sleeve base tube (21); A support ring (42) is fixedly connected to the inner side wall of the supporting outer cylinder (1), and the support ring (42) is threadedly engaged with the connecting ring (41); There are a plurality of flow holes (43) which are respectively arranged through the connecting ring (41).

8. The water control tool assembly according to claim 1, characterized in that: Insertion grooves (9) are respectively provided at the two ends of the supporting outer cylinder (1), and the outer layer of the double-layer screen tube can be inserted and matched with the supporting outer cylinder (1).

9. The water control tool assembly according to claim 1, characterized in that: The top end of the rubber tube base pipe (21) is provided with a tapered guide surface (10), and the tapered guide surface (10) is provided with a connecting thread, and the rubber tube base pipe (21) can be connected to the inner layer thread of the double-layer screen pipe.

10. The water control tool assembly according to claim 1, characterized in that: A connecting groove (11) is provided at the bottom port of the circulation sleeve (23), and the outer layer of the double-layer screen tube can be plugged into and matched with the circulation sleeve (23).

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