Water control tool assembly applied to subsection filling interlayer of oil well

Abstract

The invention discloses a water control tool assembly applied to an oil well subsection filling interlayer. The technical problem that interlayer refined water control production is difficult to achieve during oil well production is solved. The water control tool assembly is used for being arranged between two adjacent double-layer screen pipes and comprises a supporting outer cylinder and an inner pipe assembly, the inner pipe assembly is coaxially arranged in the supporting outer cylinder, the two ends of the supporting outer cylinder are used for being connected with the outer layers of the double-layer screen pipes respectively, and the two ends of the inner pipe assembly are used for being connected with the inner layers of the double-layer screen pipes respectively. An annular flow channel is formed between the inner pipe assembly and the supporting outer cylinder; the inner pipe assembly comprises a rubber cylinder base pipe, an AICD water control short section and a circulating sliding sleeve, the rubber cylinder base pipe is connected with the supporting outer cylinder through a supporting part, the rubber cylinder base pipe is sleeved with a setting rubber cylinder, and the setting rubber cylinder is used for being set between the rubber cylinder base pipe and the supporting outer cylinder. According to the invention, interlayer refined water control production during normal production of the oil well can be ensured.

Description

Technical Field

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

[0002] The development of marine oil and gas resources is the hot spot and focus of the current development of the world's marine economy. Marine oil and gas resources not only have large reserves, but modern science and technology have already possessed tremendous capabilities for their development. The marine oil and gas industry has developed into an emerging, high-value-added leading industry in the marine economy.

[0003] At present, offshore oil wells, especially open hole horizontal wells, have high water content, which is difficult to treat. The existing technology usually uses bypass isolation packers to fill the open hole in sections, and uses double-layer screens and AICD valves between the section filling layers to achieve water control production.

[0004] However, after the oil well is segmented, the layers have different water contents due to uneven formation fluid production positions. Liquids with different water contents at different positions between layers all enter the annulus between the screen jacket and the base pipe, and enter the AICD valve after being generally mixed. The objective condition for the AICD valve to sensitively respond to liquids with different water contents is lost, and fine water control of this layer cannot be achieved, 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 used for 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 used between segmented filling layers of an oil well, wherein the water control tool assembly is used to be arranged between two adjacent double-layer screen tubes, and the water control assembly comprises a vertically arranged supporting outer tube and an inner tube assembly, wherein the inner tube assembly is coaxially arranged inside the supporting outer tube, and the two ends of the supporting outer tube are respectively used to be connected to the outer layer of the double-layer screen tube, and the two ends of the inner tube assembly are respectively used to be connected to 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;

[0007] The inner tube assembly includes a rubber tube base tube, an AICD water control short joint and a circulating sleeve which are connected in sequence from top to bottom. The rubber tube base tube is connected to the supporting outer tube through a supporting portion. A sealing rubber tube is sleeved on the rubber tube base tube, and the sealing rubber tube is used for sealing 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 vulcanized and fixed to the middle position of the rubber cylinder base tube, 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, 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, vertically slidably connected to the inside of the circulation sleeve;

[0012] A limit clamp ring, arranged 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 supporting ring groove is provided on the control sleeve, and the limiting clamp ring is C-shaped and partially embedded in the supporting ring groove.

[0017] Optionally, a plurality of groups of sealing rings are arranged 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, fixedly connected to the inner 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 two ends of the supporting outer cylinder, and the outer layer of the double-layer screen tube can be plugged 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 with 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 tube can be plugged and matched with the circulation sleeve.

[0025] It can be seen from the above technical solution that the water control tool assembly applied to the segmented filling layers of an oil well provided by the present invention has the following advantages:

[0026] The water control tool assembly can be set between two adjacent double-layer screens, and multiple double-layer screens and multiple water control tool assemblies can be used to segment the filling layer again, so that the oil at different positions between the layers can enter the water control tool assembly through the corresponding double-layer screens nearby to prevent the interlayer oil from being mixed, thereby achieving fine water control production between layers. At the same time, the water control tool assembly can also improve the filling efficiency, and can effectively increase the oil production when the oil well is extracted at the end of production. Not only that, the water control tool assembly has a simple structure, low cost, easy production, and reliable switching, which provides a good guarantee for improving gravel filling efficiency, fine water control production between layers, and extraction of liquid at the end of production.

[0027] Other features and advantages of the present invention will be set forth in the description which 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 on 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. Sealing 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. Installation groove; 9. Plug-in groove; 10. Conical guide surface; 11. Connecting groove. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other arbitrarily without conflict.

[0035] like Figure 1 , Figure 2 , Figure 3 An embodiment of the present invention is shown, in which a water control tool assembly used between segmented filling layers of an oil well is disclosed. 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 includes a rubber tube base tube 21, an AICD water control nipple 22 and a circulation sleeve 23 which are connected by threads from top to bottom. The rubber tube base tube 21 is connected to the supporting outer tube 1 through the supporting portion 4. The top end of the rubber tube base tube 21 is used to connect to the inner layer of the double-layer screen tube, and the bottom end of the circulation sleeve 23 is used to connect to the inner layer of the double-layer screen tube. At the same time, a sealing rubber tube 24 is sleeved on the rubber tube base tube 21, and the sealing rubber tube 24 is used to seal between the rubber tube base tube 21 and the supporting outer tube 1 to achieve the plugging of the annular flow channel 3.

[0037] In one embodiment, Figure 1 , Figure 2 As shown, 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 inside 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 flow back, thereby improving the filling efficiency. After the filling is completed, the sealing rubber tube 24 is controlled to be sealed between the rubber tube base pipe 21 and the supporting outer tube 1 to achieve the isolation inside the tool assembly and finely isolate the filling layer. Subsequently, the circulation hole 25 is controlled to be closed by the control unit 5, 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 circulation hole 25 can be controlled to open by the control unit 5 so that the oil can directly enter the inner tube 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 two adjacent double-layer screens. Since the sealing rubber tube 24 can achieve the blocking 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 nearby, and enter the pipeline through the corresponding AICD water control short section 22 to prevent the general mixing of the oil between the layers, thereby realizing fine water control production between the layers. In addition, by setting the circulation hole 25 and increasing the liquid intake, not only the filling efficiency can be improved, but also the oil production can be efficiently increased when the oil well is extracted at the end of production.

[0040] In one embodiment, Figure 1 , Figure 2 As shown, the sealing rubber cylinder 24 adopts a self-expanding rubber cylinder, and is vulcanized and fixed in the middle position of the rubber cylinder base tube 21, and there is a flow gap 6 between the outer wall of the sealing rubber cylinder 24 and the inner wall of the supporting outer cylinder 1. After a period of time after the filling operation is completed, the self-expanding rubber cylinder can automatically expand when it encounters oil, water, oil and water, hydrocarbons, etc., so as to realize automatic isolation inside the water control tool assembly, without the need for manual control of the expansion of the sealing rubber cylinder 24, which can improve the convenience of operation and improve the work efficiency. Since the self-expanding rubber cylinder is a prior art, it 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 which is 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 clamp ring 53 is embedded in the groove of the support ring 42. The limiting clamp ring 53 can be made of elastic metal material, and the outer edge position of the limiting clamp ring 53 is exposed outside the groove of the support ring 42.

[0042] In one embodiment, Figure 2 , Figure 3 As shown, the inner side wall of the circulation sleeve 23 is provided with an opening groove 54 and a closing groove 55 along its circumference, and the closing groove 55 is located below the opening groove 54. The limiting snap ring 53 is controlled to move vertically upward by an external operating tool, and 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. Similarly, the limiting snap ring 53 is controlled to move vertically downward by an external operating tool, and when the limiting snap ring 53 is engaged with the closing groove 55, the control sleeve 51 blocks the circulation hole 25, so that the circulation hole 25 is closed.

[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 circulating sleeve 23 to achieve stable sealing between the control sleeve 51 and the circulating sleeve 23.

[0045] In one embodiment, Figure 1 , Figure 2 As shown, the support part 4 includes a connecting ring 41 integrally formed and sleeved on the rubber tube base tube 21, and the inner side wall of the supporting outer tube 1 is integrally formed with a supporting ring 42 along its circumference, and the supporting ring 42 is threadedly matched with the connecting ring 41, so as to realize a quick and stable connection between the rubber tube base tube 21 and the supporting outer tube 1. At the same time, a plurality of flow holes 43 are penetrated and arranged at equal intervals along the circumference of the connecting ring 41, so that the liquid can flow through the flow holes 43, ensuring the connection of the annular 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 groove 9, that is, the outer layer of the double-layer sieve tube can be plugged into the supporting outer tube 1 to achieve 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 conical guide surface 10, and the conical 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 connection 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 connection groove 11, that is, the outer layer of the double-layer screen tube can be plugged and matched with the circulation sleeve 23, thereby realizing quick connection.

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

[0050] One or more water control tool assemblies are placed between two adjacent bypass packers and connected with each other using double-layer screen pipes. During initial filling, the setting rubber tube 24 does not expand, and there is a flow gap 6 between the outer wall of the setting rubber tube 24 and the inner wall of the supporting outer tube 1. At this time, the circulation sleeve 23 of the layer is controlled to move upward through an external tool, and the circulation hole 25 is opened to facilitate the rapid reflux of the filled liquid.

[0051] After a period of time after the filling operation is completed, the self-expanding rubber cylinder can automatically expand when it encounters oil, water, oil and water, hydrocarbons, etc., to achieve isolation inside the water control tool assembly, thereby finely isolating the filling layer into several small sections. Then, the circulation hole 25 of the layer is closed, and fine water control production can be achieved through the AICD water control short joint 22 of the small section. When the oil well needs to be pumped in the later stage, the circulation hole 25 can be opened to allow the oil to directly enter the inner tube assembly 2 from the circulation hole 25, thereby achieving rapid liquid extraction.

[0052] From the above, it can be seen that the device can improve the filling efficiency. At the same time, it can realize fine water control production between layers during normal production of oil wells, and can effectively increase the oil production when extracting liquid at the end of oil well production. Compared with the original operation process, the water control tool assembly has a simple structure, low cost, easy production, and reliable switch, which provides a good guarantee for improving gravel filling efficiency, fine water control production between layers, and extracting liquid at the end of production.

[0053] It should be noted that, unless otherwise specified, the technical terms 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 technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment 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 for oil well segmented filling layers, characterized in that: The water control tool assembly is used to be arranged between two adjacent double-layer screen tubes. The water control assembly comprises a vertically arranged supporting outer tube (1) and an inner tube assembly (2). The inner tube assembly (2) is coaxially arranged inside the supporting outer tube (1). The two ends of the supporting outer tube (1) are respectively used to be connected to the outer layer of the double-layer screen tube, and the two ends of the inner tube assembly (2) are respectively used to be connected to 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 tube (1). The inner tube assembly (2) comprises a rubber tube base tube (21), an AICD water control nipple (22) and a circulation sleeve (23) which are 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: The circulation sleeve (23) is provided with a circulation hole (25), the circulation hole (25) connects the annular flow channel (3) and the interior of the circulation sleeve (23), and the circulation sleeve (23) is provided with a control unit (5) for controlling the opening and closing of the circulation hole (25).

4. The water control tool assembly according to claim 3, characterized in that: The control unit (5) comprises: A control sleeve (51) vertically slidably connected to the inside of the circulation sleeve (23); A limiting snap ring (53) is arranged 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 limit snap ring (53) is controlled by an external operating tool. When the limit snap ring (53) is engaged with the opening groove (54), the circulation hole (25) is exposed to open the circulation hole (25). When the limit 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 support ring (42) groove is provided on the control sliding sleeve (51), and the limiting clamping ring (53) is C-shaped and partially embedded in the support ring (42) groove.

6. The water control tool assembly according to claim 4, characterized in that: A plurality of 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).

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 wall of the supporting outer cylinder (1), and the support ring (42) is threadedly matched 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 sleeve base pipe (21) is provided with a conical guide surface (10), and the conical guide surface (10) is provided with a connecting thread, so that the rubber sleeve base pipe (21) can be connected with the inner 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 and matched with the circulation sleeve (23).

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