Micro-rotation oil stabilizing and water controlling device and application method

Abstract

The invention discloses a micro-rotation oil stabilizing and water controlling device and an application method. A central pipe is sequentially sleeved with an inner sleeve and an outer sleeve, an oil flow inlet channel is formed between the central pipe and the inner sleeve, a low-water-content oil flow inlet is formed in the inner sleeve, a water blocking ring is arranged between the inner sleeve and the outer sleeve, a screen pipe is arranged on the outer sleeve, and an upper connector and a lower connector are installed at the two ends of the outer sleeve; an oil collecting chamber II, an oil collecting chamber I and a buffer chamber which are communicated in sequence are formed between the outer sleeve and the central pipe, the buffer chamber, the oil flow inlet channel and the low-water-content oil flow inlet are communicated, a valve core II is arranged between the oil collecting chamber II and the oil collecting chamber I, and a valve core I is arranged between the oil collecting chamber I and the buffer chamber. The oil stabilizing and water controlling effects can be achieved, and the development effect is improved; the high-water-content well realizes controlled extraction of sewage, reduces the water content of crude oil, and reduces the sewage treatment cost increased by invalid sewage circulation.

Description

Technical Field

[0001] This invention relates to the field of oil well production technology, and in particular to a micro-swirl oil stabilization and water control device and its application method. Background Technology

[0002] In multi-layered oil well production, high-water-cut, high-pressure layers, due to their high pressure, inhibit the production of low-water-cut, low-pressure layers, especially in the later stages of development, resulting in an alternating distribution of high and low water-cut layers. When oil and water enter the casing, they can only circulate within the system, leading to ineffective wastewater treatment and incurring significant costs. Currently, oil wells with high water cuts primarily rely on chemical profile control for water shut-off, but the results are unsatisfactory, and there are no better alternative water control technologies. Chemical profile control for water shut-off is a general approach, making it difficult to assess its effectiveness before implementation, especially in wells with large pores in the oil layer, where the chemicals are difficult to apply effectively. Dry penetration methods are ineffective, and low permeability can easily reduce permeability, compromising the water shut-off effect. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a micro-swirl oil stabilization and water control device and its application method, which can control wastewater production, control ineffective wastewater recycling and treatment, and reduce the water content of oil well produced fluid.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a micro-swirl oil stabilization and water control device, including a central tube, an inner sleeve and an outer sleeve are sequentially fitted outside the central tube, an oil flow inlet channel is formed between the central tube and the inner sleeve, a low water content oil flow inlet is provided on the inner sleeve, a water blocking ring is provided between the inner sleeve and the outer sleeve, a screen tube is provided on the outer sleeve, an upper connector and a lower connector are installed at both ends of the outer sleeve, and an oil collection chamber two, an oil collection chamber one and a buffer chamber are sequentially connected between the outer sleeve and the central tube, the buffer chamber, the oil flow inlet channel and the low water content oil flow inlet are connected, a valve core two is provided between oil collection chamber two and oil collection chamber one, and a valve core one is provided between oil collection chamber one and the buffer chamber.

[0005] Furthermore, there are two sets of water-blocking rings.

[0006] Furthermore, a retaining ring is provided between the two sets of water-blocking rings.

[0007] Furthermore, valve core two has a conical structure.

[0008] Furthermore, the top of valve core two is provided with a horizontal end face.

[0009] Furthermore, curved grooves are provided on the outer wall of valve core two, and a helical rod is provided inside valve core two.

[0010] Furthermore, the structure of valve core one is the same as that of valve core two.

[0011] Furthermore, the water-blocking ring has a plate-like spiral structure.

[0012] Furthermore, the coating material of the water-blocking ring is an organic nonpolar molecular material, which has oleophilic and hydrophobic properties.

[0013] A method for applying a micro-vortex oil stabilization and water control device includes the following steps:

[0014] Step 1: Connect to the designed depth according to the design requirements, and perform magnetic positioning and depth calibration;

[0015] Step 2: Pressurize the pump truck;

[0016] Step 3: Remove the tubing and lower the pump for production;

[0017] Step 4: Layered oil recovery;

[0018] Step 5: Establish an oil-blocking zone around the screen tube;

[0019] Step Six: High water content is prevented from entering the wellbore;

[0020] Step 7: When the bottom pressure is greater than the fluid column pressure inside the wellbore, the crude oil will be pushed into the oil stabilization and water control device, establishing a second barrier.

[0021] Further, in step one, first connect the plug, oil stabilization and water control device, packer, large-mesh screen tube, oil pump, and sucker rod to the design depth according to the design requirements, and then use magnetic positioning to check the depth to ensure that the packer is accurately positioned.

[0022] Further, in step two, the pump truck pressurizes the pump to set the packer, and pressurization continues until the packer is released.

[0023] Further, in step four, stratified oil production, when the oil flow enters the inner wellbore, the oil flow first enters the plate-shaped spiral water-blocking ring channel through the screen pipe. Because the plate-shaped spiral water-blocking ring has an oil-loving and hydrophobic effect, it will first adsorb oil onto the body, forming the first barrier against water.

[0024] Furthermore, in step five, the flow rate of the oil is restricted, and oil and water flow through simultaneously. The oil droplets quickly adsorb each other, the channel fills up, and an oil zone that blocks water is gradually established around the screen tube.

[0025] Furthermore, in step six, as the area of ​​water blockage accumulates and expands, it will extend to the area near the well, preventing high water content from entering the wellbore.

[0026] Furthermore, in step seven, when the bottom pressure is greater than the fluid column pressure inside the wellbore, the crude oil will be propelled into the oil stabilization and water control device. At this time, the oil collection chamber also plays a role in oil flow aggregation. Through the function of the water control valve, a second barrier is established to control the rapid flow of sewage.

[0027] The beneficial effects of this invention are: it can achieve oil stabilization and water control, thereby improving development efficiency; it enables high water-cut wells to control wastewater production, reduce the water content of crude oil, and reduce ineffective wastewater circulation, thus increasing wastewater treatment costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is the main view of the valve core;

[0031] Figure 3 This is a top view of the valve core;

[0032] Figure 4 This invention provides a partially magnified view. Figure 1 ;

[0033] Figure 5 This invention provides a partially magnified view. Figure 2 ;

[0034] Figure 6 This is a schematic diagram illustrating the application of the present invention.

[0035] The components are as follows: 1. Upper connector; 2. Oil collection chamber two; 3. Valve core two; 4. Oil collection chamber one; 5. Valve core one; 6. Buffer chamber; 7. Oil flow inlet channel; 8. Outer sleeve; 9. Water-blocking ring; 10. Inner sleeve; 11. Screen tube; 12. Baffle ring; 13. Low water content oil flow inlet; 14. Central tube; 15. Lower connector; 16. Sucker rod; 17. Oil pump; 18. Large-aperture screen tube; 19. Packer; 20. Oil stabilization and water control device; 21. Plug. Detailed Implementation

[0036] The following will be combined with the appendix Figure 1-6 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.

[0038] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only for distinction and should not be construed as indicating or implying relative importance.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] A micro-swirl oil stabilization and water control device includes a central tube 14, with an inner sleeve 10 and an outer sleeve 8 sequentially fitted around the central tube 14. The central tube 14 and the inner sleeve 10 form an oil flow inlet channel 7. The inner sleeve 10 has a low water content oil flow inlet 13. Two sets of water-blocking rings 9 are provided between the inner sleeve 10 and the outer sleeve 8. The water-blocking rings 9 have a plate-shaped spiral structure. A retaining ring 12 is provided between the two sets of water-blocking rings 9. A screen tube 11 is provided on the outer sleeve 8. An upper connector 1 and a lower connector 15 are installed at both ends of the outer sleeve 8. The outer sleeve 8 and the central tube 14 form an oil collection chamber 2, an oil collection chamber 4, and a buffer chamber 6 that are sequentially connected. The buffer chamber 6, the oil flow inlet channel 7, and the low water content oil flow inlet 13 are connected. A valve core 2 3 is provided between the oil collection chamber 2 and the oil collection chamber 4, and a valve core 5 is provided between the oil collection chamber 4 and the buffer chamber 6. Valve core 2 (3) has a conical structure with a horizontal end face at the top and curved grooves on its outer wall. A helical rod is located inside valve core 2 (3). Valve core 1 (5) has the same structure as valve core 2 (3). The coating material of the water-blocking ring 9 is an organic non-polar molecular material with oleophilic and hydrophobic properties. The organic non-polar molecular material can be polyoxypropylene-based, long-chain perfluoroalkyl, or polysiloxane-based.

[0041] A method for applying a micro-vortex oil stabilization and water control device includes the following steps:

[0042] Step 1: First, connect the plug 21, oil stabilizing and water controlling device 20, packer 19, large-mesh screen tube 18, oil pump 17, and sucker rod 16 to the design depth according to the design requirements, and then use magnetic positioning to check the depth to ensure that the packer is accurately positioned.

[0043] Step 2: Pressurize the pump truck to set the packer 19, continue pressurizing, and the upper packer 19 will be released;

[0044] Step 3: Remove the tubing and lower the pump for production;

[0045] Step 4: Layered oil production. When the oil flows into the inner wellbore, it first enters the channel of the plate-shaped spiral water-blocking ring 9 through the screen pipe 11. Since the plate-shaped spiral water-blocking ring 9 has an oil-loving and hydrophobic effect, it will first adsorb the oil onto the body, forming the first barrier against water.

[0046] Step 5: The flow rate of the oil is restricted, and the oil and water flow through at the same time. The oil droplets are quickly adsorbed, the channel is filled, and an oil area will be built around the screen tube 11 to block water.

[0047] Step Six: As the area of ​​water blockage accumulates and expands, it will extend to the area near the well, preventing high water content from entering the wellbore;

[0048] Step 7: When the bottom pressure is greater than the fluid column pressure in the wellbore, the crude oil will be pushed into the oil stabilization and water control device 20. At this time, the oil collection chamber also plays the role of oil flow aggregation. Through the function of the water control valve, a second barrier is established to control the rapid flow of sewage.

[0049] Upper connector 1: Connects to the oil pipe.

[0050] Oil collecting chamber 2: Secondary low-water-content oil accumulation, which inhibits the rapid flow of water.

[0051] Valve Core 2, Part 3: The oil inlet is tangentially aligned with Valve Core 2, Part 3. When subjected to water impact, the 45-degree water impact force is divided into upward and horizontal forces. These forces act simultaneously and rapidly on Valve Core 2, Part 3, causing it to move upward in a micro-spiral motion. This reduces the size of the outlet of Oil Collection Chamber 2, controlling the rapid passage of high-water-content oil. When low-water-content crude oil passes through, its higher viscosity and slower flow rate prevent it from exerting significant thrust on Valve Core 2, Part 3. The outlet of Oil Collection Chamber 2, Part 2, enlarges, allowing for faster oil flow and thus controlling water flow.

[0052] Oil collecting chamber 4: Low water content oil accumulates in one stage, which inhibits the rapid flow of water.

[0053] Valve Core 5: The oil inlet is tangentially designed to the valve core. When subjected to water impact, the impact force at the 45-degree inlet is divided into upward and horizontal forces. These forces act simultaneously on the valve core, causing it to move upward in a micro-spiral motion. This reduces the size of the outlet of the oil collecting chamber 4, controlling the rapid passage of high-water-content oil. When low-water-content crude oil passes through, its higher viscosity and slower flow rate result in less thrust on the valve core, leading to a larger outlet of the oil collecting chamber 4 and a faster oil flow, thus controlling water flow.

[0054] Buffer chamber 6: Low-water-content oil enters and accumulates, preventing high-water-content oil from passing through rapidly.

[0055] Outer layer 8: Establish oil flow channels.

[0056] Water-blocking ring 9: It has an oleophilic and hydrophobic effect and is wrapped between the inner sleeve 10 and the outer sleeve 8. When high water-content oil passes through, the oil chain is quickly adsorbed on the spiral water-blocking ring 9, which plays a role in controlling the rapid passage of high water-content oil.

[0057] Inner sleeve 10: Establishes an oil flow channel.

[0058] Screen tube 11: Sand blocking, oil inlet.

[0059] 12-ring barrier: for channel isolation.

[0060] Central pipe 14: Establish a channel.

[0061] Lower connector 15: Connects to the oil pipe.

[0062] Sucker rod 16: Connects to the oil pump.

[0063] Oil pump 17: Lifts liquid.

[0064] Large-mesh screen tube 18: connects the oil pipe and casing annulus to monitor the dynamic liquid level.

[0065] Packer 19: Seals the annulus between the tubing and casing, separating the oil layer.

[0066] Oil stabilization and water control device 20: Used for water control during oil production.

[0067] Plug 21: Used to seal oil pipes.

[0068] The oil stabilization and water control device 20 has an oil-loving and hydrophobic effect. Oil is extracted through the oil stabilization and water control device 20, and the oil entering the oil stabilization and water control device 20 is accumulated, creating an oil gathering area around the oil stabilization and water control device 20. When the oil-water mixture of the formation enters the area around the oil stabilization and water control device 20, the oil is quickly adsorbed into the oil gathering area. Under the bottom hole pressure, the low water content oil is first pushed into the oil stabilization and water control device 20, and the water is controlled to the periphery, thus achieving the water control effect.

[0069] The 20-channel design of the oil-water stabilization and control device serves to control water flow. Multiple nodes within the 20-channel design act as oleophiles and hydrophobes. Oil flows through quickly, while water flow is blocked, reducing wastewater production and ineffective circulation. The valve core automatically identifies and controls the flow of oil and water based on their differences in viscosity, density, and other physical properties. Low-viscosity formation water does not easily pass through, resulting in a large throttling pressure differential, while high-viscosity oil passes through easily; the higher the viscosity, the smaller the throttling pressure differential.

[0070] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims. Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the features in the embodiments disclosed in the present invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, 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 micro-swirl oil stabilization and water control device, characterized in that, It includes a central tube (14), an inner sleeve (10), and an outer sleeve (8) that are connected in sequence. The central tube (14) and the inner sleeve (10) form an oil flow inlet channel (7). The inner sleeve (10) has a low water content oil flow inlet (13). The two ends of the outer sleeve (8) are equipped with an upper connector (1) and a lower connector (15). The outer sleeve (8) and the central tube (14) form an oil collection chamber two (2), an oil collection chamber one (4), and a buffer chamber (6) that are connected in sequence. A valve core two (3) and a valve core one (5) are provided.

2. The micro-vortex oil stabilization and water control device according to claim 1, characterized in that, Two sets of water-blocking rings (9) are provided between the inner sleeve (10) and the outer sleeve (8).

3. The micro-vortex oil stabilization and water control device according to claim 2, characterized in that, A retaining ring (12) is provided between the two sets of water-blocking rings (9).

4. The micro-vortex oil stabilization and water control device according to claim 1, characterized in that, The valve core 2 (3) is a cone structure.

5. The micro-vortex oil stabilization and water control device according to claim 4, characterized in that, The valve core 2 (3) has a horizontal end face at its top.

6. The micro-vortex oil stabilization and water control device according to claim 4, characterized in that, The outer wall of the valve core 2 (3) is provided with a curved groove, and the inside of the valve core 2 (3) is provided with a spiral rod.

7. The micro-vortex oil stabilization and water control device according to claim 1, characterized in that, The structure of valve core one (5) is the same as that of valve core two (3).

8. The micro-vortex oil stabilization and water control device according to claim 2, characterized in that, The water-blocking ring (9) has a sheet-like spiral structure.

9. The micro-vortex oil stabilization and water control device according to claim 2, characterized in that, The coating material of the water-blocking ring (9) is an organic nonpolar molecular material, which has oleophilic and hydrophobic properties.

10. The micro-vortex oil stabilization and water control device according to claim 1, characterized in that, The outer casing (8) is provided with a sieve tube (11).

11. The micro-vortex oil stabilization and water control device according to claim 1, characterized in that, The buffer chamber (6), the oil flow inlet channel (7), and the low water content oil flow inlet (13) are connected.

12. The micro-vortex oil stabilization and water control device according to claim 1, characterized in that, A valve core 2 (3) is provided between the oil collection chamber 2 (2) and the oil collection chamber 1 (4), and a valve core 1 (5) is provided between the oil collection chamber 1 (4) and the buffer chamber (6).

13. An application method of a micro-vortex oil stabilization and water control device, characterized in that, The micro-vortex oil-stabilizing and water-controlling device according to any one of claims 1-12 comprises the following steps: Step 1: Connect to the designed depth according to the design requirements, and perform magnetic positioning and depth calibration; Step 2: Pressurize the pump truck; Step 3: Remove the tubing and lower the pump for production; Step 4: Layered oil recovery; Step 5: Establish an oil-blocking zone around the screen tube (11); Step Six: High water content is prevented from entering the wellbore; Step 7: When the bottom pressure is greater than the liquid column pressure in the wellbore, the crude oil will be pushed into the oil stabilization and water control device (20) to establish a second barrier.

14. The application method of the micro-vortex oil stabilization and water control device according to claim 13, characterized in that, In step one, the plug (21), oil stabilizing and water controlling device (20), packer (19), large-mesh screen tube (18), oil pump (17), and sucker rod (16) are connected and lowered to the design depth according to the design requirements. Then, magnetic positioning is used to check the depth to ensure that the packer is accurately positioned.

15. The application method of the micro-vortex oil stabilization and water control device according to claim 13, characterized in that, In step two, the pump truck pressurizes the pump to set the packer (19), and pressurization continues until the packer (19) is released.

16. The application method of the micro-vortex oil stabilization and water control device according to claim 13, characterized in that, In step four, layered oil production, when the oil flow enters the inner wellbore, the oil flow first enters the channel of the plate-shaped spiral water-blocking ring (9) through the screen pipe (11). Since the plate-shaped spiral water-blocking ring (9) has oleophilic and hydrophobic effects, it will first adsorb oil onto the body, forming the first barrier against water.

17. The application method of the micro-vortex oil stabilization and water control device according to claim 13, characterized in that, In step five, the flow rate of the oil is restricted, and the oil and water flow through at the same time. The oil droplets are quickly adsorbed, the channel is filled, and an oil area will be established around the screen tube (11) to block water.

18. The application method of the micro-vortex oil stabilization and water control device according to claim 13, characterized in that, As described in step six, the area of ​​water blockage accumulates and expands, eventually reaching the area near the well, where high water content will be prevented from entering the wellbore.

19. The application method of the micro-vortex oil stabilization and water control device according to claim 13, characterized in that, In step seven, when the bottom pressure is greater than the liquid column pressure in the wellbore, the crude oil will be pushed into the oil stabilization and water control device (20). At this time, the oil collection chamber also plays the role of oil flow aggregation. Through the function of the water control valve, a second barrier is established to control the rapid flow of sewage.

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