Inner labyrinth type sand prevention, water control and oil stabilization device

Abstract

The invention discloses an inner labyrinth type sand control, water control and oil stabilization device. The technical problem that the water control, oil stabilization and sand control effects are poor in the oil well exploitation process is solved. The device comprises an upper connector, a supporting cylinder, a lower connector and a sand prevention assembly which are sequentially connected from top to bottom, a resistance dividing structure is arranged in the supporting cylinder, and the resistance dividing structure is used for separating oil and water in an oil reservoir and blocking the water so that the oil can flow upwards through the resistance dividing structure. Stable water control, oil stabilization and sand prevention effects can be realized, the operation difficulty and the operation cost are reduced, and the operation time efficiency and the success rate can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of well completion tools, and particularly relates to an inner labyrinth type sand control, water control and oil stabilization device. 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] As oil and gas well development enters the middle and late stages, the surrounding edge water and bottom water will gradually invade the oil layer, causing the water content and sand content of the formation to rise sharply. Currently, water control and sand prevention have become key technical problems restricting stable production and efficiency improvement.

[0004] However, the water control and sand prevention devices in the existing technology have problems such as difficult maintenance and high subsequent operation costs. At the same time, water control measures such as continuous sealing body sand control and water-flooded layer water control perforation are costly, short-lived and have a low success rate, 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 an internal labyrinth sand control, water control and oil stabilization device, which can achieve stable water control, oil stabilization and sand control effects, reduce operation difficulty and operation cost, and improve operation timeliness and success rate.

[0006] The present invention provides an inner labyrinth type sand control, water control and oil stabilization device, comprising:

[0007] Upper joint, used to connect to the production tubing string;

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

[0009] A lower joint connected to the bottom of the support tube;

[0010] a sand control assembly connected to the bottom of the lower joint;

[0011] A resistance-dividing structure is provided in the supporting tube;

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

[0013] Optionally, the resistance-dividing structure includes:

[0014] There are multiple support rings, each of which is coaxially arranged in the support tube;

[0015] There are multiple receiving rings, which are coaxially arranged in the support tube respectively, and the multiple receiving rings and the multiple supporting rings are arranged at intervals and abut against each other;

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

[0017] There are multiple barrier rings, each of which is fixed to the bottom of the corresponding receiving ring. 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] Among them, each diverter ring is respectively provided with an oil hole at the lower end and a water hole at the upper end, and multiple barrier rings are respectively located above the corresponding water holes, so that multiple barrier slopes can jointly block water from flowing upward.

[0019] Optionally, there are multiple oil-permeable holes on each diverter ring, and the multiple oil-permeable holes on each diverter ring are fan-shaped and arranged at equal intervals along the circumference of the diverter ring, and the multiple oil-permeable holes on two adjacent diverter rings are aligned one by one.

[0020] Optionally, there are multiple water-permeable holes on each barrier ring, and the multiple water-permeable holes on each barrier ring are arc-shaped and 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 have the same inclination angle.

[0022] Optionally, the upper joint, the support tube and the lower joint are threadedly connected in sequence, the bottom of the upper joint and the top of the lower joint are respectively provided with a first step surface, and the resistance separation structure is compressed and limited between the two first step surfaces.

[0023] Optionally, the sand control assembly includes:

[0024] A sand control cylinder is coaxially connected to the bottom of the lower joint, and a plurality of sand control sieve holes are evenly arranged on the surface of the sand control cylinder;

[0025] an upper sand control screen plate, arranged at the upper end of the sand control cylinder;

[0026] The lower sand control screen plate is arranged at the lower end position in the sand control cylinder.

[0027] Optionally, a second step surface is provided at the bottom of the lower joint, the sand control cylinder is threadedly connected to the lower joint, and the sand control cylinder presses the upper sand control screen plate to be limited on the second step surface.

[0028] Optionally, a third step surface is provided at the bottom of the sand control cylinder, the bottom of the sand control cylinder is threadedly connected to a limiting cylinder, and the limiting cylinder presses the lower sand control screen plate to be limited on the third step surface.

[0029] From the above technical solution, it can be seen that the inner 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 control effects. Compared with existing water control and sand control devices, this device is simpler to operate, which can not only reduce operation difficulty and operation costs, but also improve operation timeliness and success rate.

[0031] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

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

[0035] Figure 3 Schematic diagram of the structure of the support ring and the diverter ring in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the structure of the receiving ring and the barrier ring in an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of oil and water flow in an embodiment of the present invention;

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

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

[0040] Figure 8 1 is an exploded view of the sand control assembly in an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1. Upper joint; 2. Support tube; 3. Lower joint; 4. Sand control assembly; 41. Sand control tube; 42. Sand control sieve hole; 43. Upper sand control sieve plate; 44. Lower sand control sieve plate; 45. Limiting tube; 5. Resistance separation structure; 51. Support ring; 52. Receiver ring; 53. Diverter ring; 54. Diverter cone surface; 55. Blocking ring; 56. Blocking slope; 57. Oil hole; 58. Water hole; 6. First step surface; 7. Second step surface; 8. Third step surface. DETAILED DESCRIPTION

[0043] 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.

[0044] like Figures 1-8 The figure shows an embodiment of the present invention, which discloses an internal labyrinth-type sand control, water control, and oil stabilization device. The device comprises, sequentially connected from top to bottom, an upper joint 1, a support tube 2, a lower joint 3, and a sand control assembly 4. The upper joint 1 is used to connect to the production tubing string. A resistance structure 5 is disposed within the support tube 2. This structure is used to separate oil and water in the reservoir, blocking the water and allowing the oil to flow upward through the resistance structure 5.

[0045] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 As shown, the resistance dividing structure 5 includes a plurality of support rings 51 and a plurality of receiving rings 52, and the plurality of support rings 51 and the plurality of receiving rings 52 are arranged at intervals and abut against each other. At the same time, the plurality of support rings 51 and the plurality of receiving rings 52 are coaxially arranged in the support tube 2, and the outer side walls of the plurality of support rings 51 and the plurality of receiving rings 52 are respectively tightly fitted with the inner side wall of the support tube 2.

[0046] In one embodiment, 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 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. 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 54 and the barrier slope 56 have the same inclination angle.

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

[0048] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 As shown, each diverter ring 53 is provided with a plurality of oil-permeable holes 57 , and the plurality of oil-permeable holes 57 on each diverter ring 53 are fan-shaped and arranged at equal intervals along the circumference of the diverter ring 53 . At the same time, the plurality of oil-permeable holes 57 on two adjacent diverter rings 53 are aligned one by one.

[0049] In one embodiment, Figure 2 、 Figure 3 、 Figure 4 As shown, each barrier ring 55 is provided with a plurality of water-permeable holes 58 , and the plurality of water-permeable holes 58 on each barrier ring 55 are arc-shaped and arranged at equal intervals along the circumference of the barrier ring 55 . At the same time, the plurality of 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, including multiple diverter rings 53 and barrier rings 55, forms a three-dimensional annular Tesla flow channel structure. This utilizes the differences in fluid viscosity under varying water content conditions to create differentiated flow resistance. This means that low-density, high-viscosity, low-water-content reservoir fluids flow more easily, while high-density, low-viscosity, high-water-content reservoir fluids have a harder time passing through. This reduces the water content of the output and achieves water control and oil stabilization. Furthermore, the sand control assembly 4 effectively blocks formation sand, ultimately achieving a synergistic, combined effect of stable water control, oil stabilization, and sand control.

[0051] like Figure 5 、 Figure 6 As shown, after the oil-water mixture enters the tubing string, it is initially split by the diverter ring 53 and then enters the Tesla flow channel formed between the diverter ring 53 and the barrier ring 55. At this time, due to the different densities and viscosities of oil and water, the water encounters greater resistance in the Tesla flow channel, allowing the oil to pass smoothly, thus achieving oil-water separation and oil isolation.

[0052] In one embodiment, Figure 2 、 Figure 7As shown, the upper joint 1, support tube 2, and lower joint 3 are sequentially threadedly connected. In this embodiment, the top of the support tube 2 is inserted into the bottom of the upper joint 1 and threadedly connected thereto, while the bottom of the support tube 2 is inserted into the top of the lower joint 3 and threadedly connected thereto. Furthermore, a first stepped surface 6 is provided at the bottom of the upper joint 1 and the top of the lower joint 3, respectively. The two ends of the resistance dividing structure 5 abut against the corresponding first stepped surfaces 6, respectively. In other words, the resistance dividing structure 5 is compressed and confined between the two first stepped surfaces 6.

[0053] In one embodiment, 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 joint 3. The surface of the sand control cylinder 41 is evenly distributed with a plurality of sand control screen holes 42. An upper sand control screen plate 43 is installed at the upper end of the sand control cylinder 41, and a lower sand control screen plate 44 is installed at the lower end, thereby improving the sand control effect.

[0054] In one embodiment, Figure 8 As shown, the top of the sand control tube 41 is inserted into the bottom of the lower joint 3 and is threadedly connected to the lower joint 3. At the same time, a second step surface 7 is provided at the bottom of the lower joint 3, and the sand control tube 41 can press the upper sand control screen plate 43 to be limited on the second step surface 7, thereby realizing the limitation of the upper sand control screen plate 43.

[0055] In one embodiment, Figure 8 As shown, a third step surface 8 is provided at the bottom of the sand control tube 41, and the bottom of the sand control tube 41 is threadedly connected to a limiting tube 45, that is, the top of the limiting tube 45 is inserted into the bottom of the sand control tube 41 and is threadedly connected to the sand control tube 41. At the same time, the limiting tube 45 can press the lower sand control screen plate 44 to be limited on the third step surface 8, thereby realizing the limitation of the lower sand control screen plate 44.

[0056] Since the sides and bottom of the sand control assembly 4 have filtering functions, the flow efficiency of the fluid is ensured while effectively filtering. At the same time, if the diameter of the sand particles is small, sand control particles of a size matching the diameter of the sand particles can be filled in the sand control cylinder 41.

[0057] As can be seen from the above process, this device utilizes differences in fluid density and viscosity to selectively divert reservoir fluids with different characteristics. This allows low-density, high-viscosity, and low-water content output to flow more easily into the tubing, while making it more difficult for high-density, low-viscosity, and high-water content output to enter the tubing. This effectively reduces the water content of the reservoir's output fluid, 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 also improving timeliness and success rates.

[0058] 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.

[0059] 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.

[0060] 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. An inner labyrinth type sand control, water control and oil stabilization device, characterized in that: include: An upper joint (1) for connecting to a production tubing string; A support cylinder (2) connected to the bottom of the upper joint (1); A lower joint (3) connected to the bottom of the support tube (2); a sand control assembly (4), connected to the bottom of the lower joint (3); A resistance dividing structure (5) is arranged in the supporting tube (2); The resistance separation structure (5) is used to separate oil and water in the oil reservoir and to block the water so that the oil can flow upward through the resistance separation structure (5).

2. The inner labyrinth type sand control, water control and oil stabilization device according to claim 1 is characterized in that: The resistance dividing structure (5) comprises: A plurality of support rings (51) are coaxially arranged in the support tube (2); There are multiple receiving rings (52) which are coaxially arranged in the support tube (2). The receiving rings (52) and the supporting rings (51) are spaced apart and abut against each other. There are multiple diverter rings (53) fixed to the bottom of the corresponding support ring (51), and each diverter ring (53) is conical, so that the bottom of each diverter ring (53) forms a diverter cone surface (54); There are multiple barrier rings (55) fixed to the bottom of the corresponding receiving ring (52), and the inner diameter of each barrier ring (55) is gradually reduced from top to bottom, so that the bottom of each barrier ring (55) forms a barrier slope (56); The lower end of each diverter ring (53) is respectively penetrated by an oil hole (57), and the upper end is respectively penetrated by a water hole (58), and the plurality of barrier rings (55) are respectively located above the corresponding water holes (58), so that the plurality of barrier slopes (56) can jointly block the upward flow of water.

3. The inner labyrinth type sand control, water control and oil stabilization device according to claim 2 is characterized in that: A plurality of oil-permeable holes (57) are provided on each diverter ring (53), and the plurality of oil-permeable holes (57) on each diverter ring (53) are fan-shaped and arranged at equal intervals along the circumference of the diverter ring (53), and the plurality of oil-permeable holes (57) on two adjacent diverter rings (53) are aligned one by one.

4. The inner labyrinth type sand control, water control and oil stabilization device according to claim 2 is characterized in that: A plurality of water-permeable holes (58) are respectively provided on each of the barrier rings (55); the plurality of water-permeable holes (58) on each of the barrier rings (55) are respectively arc-shaped and arranged at equal intervals along the circumference of the barrier ring (55); and the plurality of water-permeable holes (58) on two adjacent barrier rings (55) are aligned one by one.

5. The inner labyrinth type sand control, water control and oil stabilization device according to claim 2 is characterized in that: The diversion cone surface (54) and the blocking slope (56) have the same inclination angle.

6. The inner labyrinth type sand control, water control and oil stabilization device according to claim 1 is characterized in that: The upper joint (1), the support tube (2) and the lower joint (3) are threadedly connected in sequence; the bottom of the upper joint (1) and the top of the lower joint (3) are respectively provided with a first step surface (6), and the resistance dividing structure (5) is compressed and limited between the two first step surfaces (6).

7. The inner labyrinth type sand control, water control and oil stabilization device according to claim 1 is characterized in that: The sand control assembly (4) comprises: A sand control cylinder (41) is coaxially connected to the bottom of the lower joint (3), and a plurality of sand control sieve holes (42) are evenly arranged on the surface of the sand control cylinder (41); an upper sand control screen plate (43) disposed at an upper end of the sand control cylinder (41); The lower sand control screen plate (44) is arranged at the lower end position in the sand control cylinder (41).

8. The inner labyrinth type sand control, water control and oil stabilization device according to claim 7 is characterized in that: A second step surface (7) is provided at the bottom of the lower joint (3), the sand control cylinder (41) is threadedly connected to the lower joint (3), and the sand control cylinder (41) presses the upper sand control screen plate (43) to be positioned on the second step surface (7).

9. The inner labyrinth type sand control, water control and oil stabilization device according to claim 7, characterized in that: The bottom of the sand control cylinder (41) is provided with a third step surface (8), the bottom of the sand control cylinder (41) is threadedly connected to a limiting cylinder (45), and the limiting cylinder (45) presses the lower sand control screen plate (44) to be limited on the third step surface (8).

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