An inner labyrinth sand control and water control oil stabilizing device

Abstract

The application discloses an inner-labyrinth sand-preventing water-controlling oil-stabilizing device, and solves the technical problem of poor sand-preventing water-controlling and oil-stabilizing effect in the process of oil well exploitation. The device comprises an upper joint, a supporting cylinder, a lower joint and a sand-preventing assembly which are sequentially connected from top to bottom, and the supporting cylinder is provided with a resistance separation structure. The resistance separation structure is used for separating oil and water in an oil reservoir and blocking the water, so that the oil can flow upward through the resistance separation structure. The application can realize stable water-controlling, oil-stabilizing and sand-preventing effect, reduce operation difficulty and operation cost, and improve operation time efficiency and success rate.

Description

Technical Field

[0001] This invention belongs to the field of well completion tool technology, specifically relating to an internal labyrinth-type sand control, water control, and oil stabilization device. Background Technology

[0002] The development of marine oil and gas resources is a current hot topic and focus of the world's marine economy. Marine oil and gas resources are not only abundant, but modern science and technology have also given us the ability to develop them. The marine oil and gas industry has developed into a new and high-value leading industry in the marine economy.

[0003] As oil and gas well development enters the middle and late stages, the surrounding edge water and bottom water will gradually intrude into the oil layer, causing the formation water cut and sand content to rise sharply. At present, water control and sand prevention have become key technical problems restricting stable production and efficiency.

[0004] However, existing water control and sand prevention devices suffer from problems such as difficult maintenance and high operating costs in the later stages. At the same time, water control measures such as continuous sealing sand prevention and water-controlled perforation of flooded layers are costly, have short effective periods, and low success rates, and need to be improved. Summary of the Invention

[0005] In order to solve all or part of the above problems, the purpose of this invention is to provide an internal labyrinth-type sand control, water control and oil stabilization device, which can achieve stable water control, oil stabilization and sand control effects, reduce the difficulty and cost of operation, and improve the timeliness and success rate of operation.

[0006] This invention provides an internal labyrinth-type sand control, water control, and oil stabilization device, comprising:

[0007] The upper connector is used to connect to the production tubing column;

[0008] A support cylinder is connected to the bottom of the upper connector;

[0009] The lower connector is connected to the bottom of the support cylinder;

[0010] The sand-proof assembly is connected to the bottom of the lower connector;

[0011] A resistance-splitting structure is disposed inside the support cylinder;

[0012] The barrier structure is used to separate oil and water in the reservoir and to block water so that oil can flow upward through the barrier structure.

[0013] Optionally, the resistor-splitting structure includes:

[0014] Multiple support rings are coaxially arranged inside the support cylinder.

[0015] Multiple receiving rings are coaxially arranged inside the support cylinder, with the multiple receiving rings and multiple support rings arranged at intervals and abutting against each other;

[0016] Multiple diverter rings are fixed to the bottom of the corresponding support rings. Each diverter ring is conical so that the bottom of each diverter ring forms a diverter cone surface.

[0017] Multiple barrier rings are fixed to the bottom of the corresponding receiving rings. The inner diameter of each barrier ring gradually decreases from top to bottom so that the bottom of each barrier ring forms a barrier slope.

[0018] Each of the diversion rings has an oil permeable hole at its lower end and a water permeable hole at its upper end, and multiple barrier rings are located above the corresponding water permeable holes, so that multiple barrier slopes can work together to block water from flowing upward.

[0019] Optionally, each of the flow divider rings is provided with a plurality of oil perforations, which are arranged in a fan shape and at equal intervals along the circumference of the flow divider ring, and the plurality of oil perforations on two adjacent flow divider rings are aligned one by one.

[0020] Optionally, each of the barrier rings has multiple water-permeable holes, each of the multiple water-permeable holes on the barrier ring is arc-shaped and is arranged at equal intervals along the circumference of the barrier ring, and the multiple water-permeable holes on two adjacent barrier rings are aligned one by one.

[0021] Optionally, the diversion cone surface and the blocking slope surface have the same inclination angle.

[0022] Optionally, the upper connector, the support cylinder, and the lower connector are connected by threads in sequence, and the bottom of the upper connector and the top of the lower connector are respectively provided with a first stepped surface, and the pressure limit of the resistance structure is located between the two first stepped surfaces.

[0023] Optionally, the sand-proof assembly includes:

[0024] A sand-proof cylinder is coaxially connected to the bottom of the lower connector, and the surface of the sand-proof cylinder is evenly provided with a number of sand-proof screen holes;

[0025] The upper sand-proof screen plate is installed at the upper end of the sand-proof cylinder;

[0026] The lower sand screen plate is located at the lower end of the sand-proof cylinder.

[0027] Optionally, the bottom of the lower connector is provided with a second stepped surface, the sand-proof cylinder is threadedly connected to the lower connector, and the sand-proof cylinder presses and limits the upper sand-proof screen plate to the second stepped surface.

[0028] Optionally, the bottom of the sand-proof cylinder is provided with a third stepped surface, and the bottom of the sand-proof cylinder is threadedly connected to a limiting cylinder, which presses and limits the lower sand-proof screen plate to the third stepped surface.

[0029] As can be seen from the above technical solution, the internal labyrinth-type sand control, water control, and oil stabilization device provided by the present invention has the following advantages:

[0030] This device can achieve stable water control, oil stabilization and sand prevention. Compared with existing water control and sand prevention devices, this device is simpler to operate, which can reduce the difficulty and cost of operation, and improve the timeliness and success rate of operation.

[0031] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0032] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0033] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0034] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the support ring and the diversion ring in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the receiving ring and the blocking ring in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the oil and water flow direction in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the oil-water two-phase flow field in an embodiment of the present invention;

[0039] Figure 7 This is an exploded view of an embodiment of the present invention;

[0040] Figure 8 This is an exploded view of the sand-proof assembly in an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Upper connector; 2. Support cylinder; 3. Lower connector; 4. Sandproof assembly; 41. Sandproof cylinder; 42. Sandproof screen hole; 43. Upper sandproof screen plate; 44. Lower sandproof screen plate; 45. Limiting cylinder; 5. Dividing structure; 51. Support ring; 52. Receiving ring; 53. Dividing ring; 54. Dividing cone surface; 55. Barrier ring; 56. Barrier inclined surface; 57. Oil permeable hole; 58. Water permeable hole; 6. First step surface; 7. Second step surface; 8. Third step surface. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0044] like Figures 1-8 The illustration shows an embodiment of the present invention, which discloses an internal labyrinth-type sand control, water control, and oil stabilization device. The device includes an upper connector 1, a support cylinder 2, a lower connector 3, and a sand control assembly 4 connected sequentially from top to bottom. The upper connector 1 is used to connect to the production tubing. A barrier structure 5 is provided inside the support cylinder 2. The barrier structure 5 is used to separate oil and water in the reservoir and to block water, allowing oil to flow upwards through the barrier structure 5.

[0045] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, the resistance structure 5 includes multiple support rings 51 and multiple receiving rings 52, which are spaced apart and abut against each other. Simultaneously, the multiple support rings 51 and multiple receiving rings 52 are coaxially arranged inside the support cylinder 2, and the outer walls of the multiple support rings 51 and multiple receiving rings 52 are tightly fitted to the inner wall of the support cylinder 2.

[0046] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, a conical diverter ring 53 is integrally formed and connected to the bottom of each support ring 51, and a diverter cone surface 54 is formed at the bottom of each diverter ring 53. A barrier ring 55 is integrally formed and connected to the bottom of each receiving ring 52, and the inner diameter of each barrier ring 55 gradually decreases from top to bottom, and a barrier slope 56 is formed at the bottom of each barrier ring 55. At the same time, the diverter cone surface 54 and the barrier slope 56 have the same inclination angle.

[0047] In one embodiment, such as Figure 2 , Figure 3 , Figure 4As shown, each diversion ring 53 has an oil permeable hole 57 at its lower end and a water permeable hole 58 at its upper end, and multiple barrier rings 55 are located above the corresponding water permeable holes 58, so that multiple barrier slopes 56 can jointly block water from flowing upward.

[0048] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, each diversion ring 53 has multiple oil perforations 57. The multiple oil perforations 57 on each diversion ring 53 are fan-shaped and arranged at equal intervals along the circumference of the diversion ring 53. At the same time, the multiple oil perforations 57 on two adjacent diversion rings 53 are aligned one by one.

[0049] In one embodiment, such as Figure 2 , Figure 3 , Figure 4 As shown, each barrier ring 55 has multiple water-permeable holes 58. The multiple water-permeable holes 58 on each barrier ring 55 are arc-shaped and are arranged at equal intervals along the circumference of the barrier ring 55. At the same time, the multiple water-permeable holes 58 on two adjacent barrier rings 55 are aligned one by one.

[0050] In this embodiment, the internal labyrinth-type sand control, water control, and oil stabilization device utilizes multiple diversion rings 53 and barrier rings 55 to form a three-dimensional annular Tesla flow channel structure. This structure leverages the differences in fluid viscosity under varying water-cut conditions to create differentiated flow resistance. Specifically, low-density, high-viscosity fluids from low-water-cut reservoirs pass through more easily, while high-density, low-viscosity fluids from high-water-cut reservoirs pass through more difficultly. This reduces the water content of the produced product, achieving water control and oil stabilization. Simultaneously, the sand control assembly 4 effectively blocks formation sand, ultimately achieving a synergistic effect of stable water control, oil stabilization, and sand control.

[0051] like Figure 5 , Figure 6 As shown, when the oil-water mixture enters the tubing, it is initially separated by the flow divider ring 53, and then enters the Tesla flow channel formed between the flow divider ring 53 and the barrier ring 55. At this time, due to the difference in density and viscosity between oil and water, water experiences greater resistance in the Tesla flow channel, while oil can pass through smoothly, thereby achieving oil-water separation and oil isolation.

[0052] In one embodiment, such as Figure 2 , Figure 7As shown, the upper connector 1, support cylinder 2, and lower connector 3 are sequentially threaded together. In this embodiment, the top of the support cylinder 2 is inserted into the bottom of the upper connector 1 and threadedly connected to the upper connector 1, while the bottom of the support cylinder 2 is inserted into the top of the lower connector 3 and threadedly connected to the lower connector 3. Simultaneously, the bottom of the upper connector 1 and the top of the lower connector 3 are respectively provided with a first stepped surface 6. The two ends of the resistance-splitting structure 5 abut against the corresponding first stepped surface 6, meaning the resistance-splitting structure 5 is pressed between the two first stepped surfaces 6.

[0053] In one embodiment, such as Figure 2 , Figure 8 As shown, the sand control assembly 4 includes a sand control cylinder 41 coaxially connected to the bottom of the lower connector 3, and the surface of the sand control cylinder 41 is evenly provided with a plurality of sand control screen holes 42. An upper sand control screen plate 43 is provided at the upper end and a lower sand control screen plate 44 is provided at the lower end inside the sand control cylinder 41, thereby improving the sand control effect.

[0054] In one embodiment, such as Figure 8 As shown, the top of the sand-proof cylinder 41 is inserted into the bottom of the lower connector 3 and is threadedly connected to the lower connector 3. At the same time, the bottom of the lower connector 3 is provided with a second step surface 7, and the sand-proof cylinder 41 can press and limit the upper sand-proof screen plate 43 on the second step surface 7, thereby achieving the limiting of the upper sand-proof screen plate 43.

[0055] In one embodiment, such as Figure 8 As shown, the bottom of the sand-proof cylinder 41 is provided with a third step surface 8. The bottom of the sand-proof cylinder 41 is threadedly connected to a limiting cylinder 45. That is, the top of the limiting cylinder 45 is inserted into the bottom of the sand-proof cylinder 41 and threadedly connected to the sand-proof cylinder 41. At the same time, the limiting cylinder 45 can press and limit the lower sand-proof screen plate 44 on the third step surface 8, thereby realizing the limiting of the lower sand-proof screen plate 44.

[0056] Since the sand control assembly 4 has filtration functions on both the sides and bottom, it ensures the flow efficiency of the fluid while effectively filtering. At the same time, if the sand particle diameter is small, sand control particles of the same size as the sand particle diameter can be filled into the sand control cylinder 41.

[0057] As can be seen from the above process, this device utilizes the difference in fluid density and viscosity to selectively guide reservoir fluids with different characteristics. This allows low-density, high-viscosity products with low water content to flow more easily into the tubing, while making it more difficult for high-density, low-viscosity products with high water content to enter the tubing. This effectively reduces the water content of the reservoir's produced fluids, achieving the goal of water control and oil stabilization. Compared to existing sand and water control devices, this device is simpler to operate, reducing operational difficulty and costs while improving operational efficiency and success rate.

[0058] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0059] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within 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 the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A labyrinth-type sand control, water control, and oil stabilization device, characterized in that, include: The upper connector (1) is used to connect to the production tubing; Support cylinder (2) is connected to the bottom of the upper connector (1); The lower connector (3) is connected to the bottom of the support cylinder (2); The sand-proof assembly (4) is connected to the bottom of the lower connector (3); A resistance-splitting structure (5) is disposed inside the support cylinder (2); The barrier structure (5) is used to separate oil and water in the reservoir and to block water so that oil can flow upward through the barrier structure (5). The resistor-splitting structure (5) includes: Multiple support rings (51) are coaxially arranged inside the support cylinder (2); Multiple receiving rings (52) are coaxially arranged in the support cylinder (2), and the multiple receiving rings (52) and multiple support rings (51) are spaced apart and abut against each other; Multiple diversion rings (53) are fixed to the bottom of the corresponding support rings (51). Each diversion ring (53) is conical, so that the bottom of each diversion ring (53) forms a diversion cone surface (54). There are multiple barrier rings (55) and they are fixed to the bottom of the corresponding receiving rings (52). The inner diameter of each barrier ring (55) gradually decreases from top to bottom so that the bottom of each barrier ring (55) forms a barrier slope (56). Each of the diversion rings (53) has an oil permeable hole (57) at its lower end and a water permeable hole (58) at its upper end. Multiple barrier rings (55) are located above the corresponding water permeable holes (58) so that multiple barrier slopes (56) can jointly block water from flowing upward.

2. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 1, characterized in that, Each of the diversion rings (53) has multiple oil perforations (57). The multiple oil perforations (57) on each diversion ring (53) are fan-shaped and are arranged at equal intervals along the circumference of the diversion ring (53). The multiple oil perforations (57) on two adjacent diversion rings (53) are aligned one by one.

3. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 1, characterized in that, Each of the barrier rings (55) has multiple water-permeable holes (58). The multiple water-permeable holes (58) on each barrier ring (55) are arc-shaped and are arranged at equal intervals along the circumference of the barrier ring (55). The multiple water-permeable holes (58) on two adjacent barrier rings (55) are aligned one by one.

4. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 1, characterized in that, The diversion cone (54) has the same inclination angle as the blocking slope (56).

5. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 1, characterized in that, The upper connector (1), the support cylinder (2) and the lower connector (3) are connected by threads in sequence. The bottom of the upper connector (1) and the top of the lower connector (3) are respectively provided with a first step surface (6), and the pressure limit of the resistance structure (5) is located between the two first step surfaces (6).

6. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 1, characterized in that, The sand-proof assembly (4) includes: A sand-proof cylinder (41) is coaxially connected to the bottom of the lower connector (3), and the surface of the sand-proof cylinder (41) is uniformly provided with a number of sand-proof screen holes (42); The upper sand screen plate (43) is located at the upper end of the sand screen cylinder (41); The lower sand screen plate (44) is located at the lower end of the sand-proof cylinder (41).

7. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 6, characterized in that, The bottom of the lower connector (3) is provided with a second step surface (7), the sand-proof cylinder (41) is threadedly connected to the lower connector (3), and the sand-proof cylinder (41) presses the upper sand-proof screen plate (43) tightly onto the second step surface (7).

8. The internal labyrinth-type sand control, water control, and oil stabilization device according to claim 6, characterized in that, The bottom of the sand-proof cylinder (41) is provided with a third step surface (8), and the bottom of the sand-proof cylinder (41) is threadedly connected to a limiting cylinder (45), and the limiting cylinder (45) presses and limits the lower sand-proof screen plate (44) on the third step surface (8).

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