An integrated tesla valve flow passage downhole gravel pack water control valve

Abstract

The application discloses an integrated Tesla valve flow channel downhole gravel packing water control valve, which is mainly composed of an upper valve cover, a gravel packing valve, a water control valve, a flow resistance plate, a flow resistance plate groove, a Tesla valve flow channel, a function separation plate, a valve body, an outer connecting body, a flow guide table, a funnel flow channel and the like. The Tesla flow channel of the water control valve is composed of a plurality of Tesla valve units, the number of which is at least one and at most eight. The application has two working states, namely a gravel packing state and a water control state. When in the gravel packing state, the water control channel is closed and the gravel packing channel is opened; after the gravel packing operation is completed, the gravel packing channel is closed and the water control channel is opened, thereby playing the water control function. The tool has no electronic element and spring, does not need surface pressure or cable control, and has the advantages of high reliability, low processing cost and convenient installation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field development, and particularly relates to a downhole gravel packing water control valve integrated with a Tesla valve flow channel. BACKGROUND

[0002] With the continuous development of offshore oil and gas fields, a large number of reservoirs are developed to the middle and late stages, the formation water cut increases significantly, and the development stage enters the middle and high water cut stage, the oil and gas recovery rate decreases, and the economic benefits and maintenance costs of continued production gradually cannot reach a balance. In order to continue to maintain a high recovery rate in these oil and gas wells in the middle and high water cut stage, or to prolong the water-free or low-water production period in edge and bottom water reservoirs, physical or chemical water control measures are often required. Compared with chemical water control, physical and mechanical water control has the advantages of low cost, environmental friendliness and long effective period, and therefore the physical and mechanical method is usually used for water control at present, and the self-adaptive water control valve is most widely used. The self-adaptive water control valve indeed prolongs the service life of the oil and gas well and improves the economic benefits, but the proportion of unconsolidated sandstone reservoirs in offshore oil and gas fields is large, and gravel packing sand control operations are often required. Due to the structural characteristics of the conventional self-adaptive water control valve, the difficulty of gravel packing operation is increased, which is manifested in that the wellbore pressure exceeds the formation fracture pressure during packing, thereby fracturing the formation and causing the slurry to enter the formation, polluting the reservoir and resulting in the failure of the gravel packing operation.

[0003] In summary, there are dual requirements of water control and sand control in offshore oilfields at present, but the conventional self-adaptive water control valve can meet the water control requirement but increases the difficulty of gravel packing at the current stage. Therefore, it is urgent to develop a downhole tool that can meet the dual functions of water control and gravel packing.

[0004] The downhole gravel packing water control valve integrated with a Tesla valve flow channel designed by the present application can close the water control channel, open the gravel packing channel and reduce the overpressure during gravel packing; after the gravel packing operation is completed, the gravel packing channel is closed and the channel where the water control valve is located is opened to play the water control function. SUMMARY

[0005] The present application provides a downhole gravel packing water control valve integrated with a Tesla valve flow channel for the problem ignored by the existing tool. The tool can play the water control function during the later oil and gas production and meet the requirement of low overpressure during the early gravel packing.

[0006] A downhole gravel packing water control valve integrated with a Tesla valve flow channel, characterized in that the downhole gravel packing water control valve integrated with a Tesla valve flow channel comprises an upper valve cover (14), a gravel packing valve (8), a water control valve (10), a flow resistance plate (11), a flow resistance plate groove (3), a Tesla valve flow channel (13), a function separation plate (4), a valve body (7), an outer connecting body (9), a flow guide table (15) and a funnel flow channel (16).

[0007] The valve body (7) is a regular cylindrical body; the outer body (9) is disc-shaped and connected to the outer wall of the valve body (7); the outer side of the outer body (9) is threaded; the diameter of the outer body (9) is larger than the diameter of the outer wall of the valve body (7);

[0008] The guide platform (15) is a rectangular parallelepiped and is connected to the inner wall of the valve body (7); the top surface of the guide platform (15) is the bottom surface of the gravel packing valve inlet (2); the spoiler groove (3) is provided on the upper part of the guide platform (15); the cross section of the spoiler groove (3) is rectangular; the direction in which the guide platform (15) extends toward the center of the valve body (7) is defined as the length direction, and the length of the spoiler groove (3) is less than the width of the guide platform (15);

[0009] The gravel filling valve (8) is composed of a functional partition plate (4) and an area surrounded by a valve body (7); the gravel filling valve (8) has a gravel filling valve inlet (2) and a gravel filling valve outlet (5); the cross section of the gravel filling valve inlet (2) is rectangular, and the cross section of the gravel filling valve outlet (5) is annular, and the outer diameter of the annular ring is the same as the diameter of the circle on which the inner wall surface of the valve body (7) is located;

[0010] The water control valve (10) comprises an area surrounded by two structures, namely a functional separation plate (4) and an upper valve cover (14); the water control valve (10) comprises a water control valve inlet (1) and a water control valve outlet (6); the water control valve inlet (1) has a rectangular cross-section; the area enclosed by the rear end of the functional separation plate (4) constitutes the water control valve outlet (6);

[0011] The length of the water control valve inlet (1) is equal to the length of the gravel filling valve inlet (2); the width of the water control valve inlet (1) is equal to the width of the gravel filling valve inlet (2); the water control valve inlet (1) is parallel to the gravel filling valve inlet (2) and separated by a functional separation plate (4); the water control valve inlet (1) extends inward to a position directly above the spoiler groove (3); a through hole is provided on the functional separation plate (4) for placing a spoiler (11); the height of the spoiler (11) is greater than the height of the gravel filling valve inlet (2); when lowered, the bottom end of the spoiler (11) is lower than the top of the spoiler groove (3);

[0012] The water control valve (10) is composed of a water control valve inlet (1), a Tesla valve flow channel (13), a funnel flow channel (16) and a water control valve outlet (6); the Tesla valve flow channel (13) is composed of a plurality of Tesla valve units (12); the number of Tesla valve units (12) is at least 1 and at most 8; the Tesla valve units (12) are distributed at equal distances along the circumference of the valve body (7); the tail end of the Tesla valve flow channel (13) is connected to the upper part of the funnel flow channel (16); the funnel flow channel (16) is composed of a conical cone at the upper part and a cylinder at the lower part; the water control valve outlet (6) is located at the tail end of the funnel flow channel (16);

[0013] The downhole gravel-filled water control valve with an integrated Tesla valve flow channel has two working states: a gravel-filled state and a water control state; the gravel-filled state and the water control state cannot exist at the same time; when in the gravel-filled state, the upper end of the baffle (11) contacts the top end of the water control valve inlet (1); when in the water control state, the upper end of the baffle (11) contacts the bottom end of the water control valve inlet (1);

[0014] The surfaces of the valve body (7), the outer body (9), the baffle (11), the upper valve cover (14) and the guide platform (15) are coated with anti-corrosion materials; the valve body (7) and the upper valve cover (14) are connected and matched by threads.

[0015] In summary, the present invention has the following beneficial effects: during gravel packing, the water control channel is closed and the gravel filling channel is opened, reducing the pressure passing through the valve during gravel packing. After the gravel packing operation is completed, the gravel filling channel is closed and the channel containing the water control valve is opened to perform the water control function. This tool has no electronic components, no springs, and does not require ground pressure or cable control. It has the advantages of high reliability, low processing cost, and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front cross-sectional view of the present invention in a gravel packing working state;

[0017] Figure 2 It is a front cross-sectional view of the present invention in the water control working state;

[0018] Figure 3 It is a top view of the present invention.

[0019] Description of the symbols in the above drawings:

[0020] 1. Water control valve inlet; 2. Gravel packing valve inlet; 3. Baffle groove; 4. Functional separator; 5. Gravel packing valve outlet; 6. Water control valve outlet; 7. Valve body; 8. Gravel packing valve; 9. External connection body; 10. Water control valve; 11. Baffle; 12. Tesla valve unit; 13. Tesla valve flow channel; 14. Upper valve cover; 15. Guide platform; 16. Funnel flow channel. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a front cross-sectional view of the present invention in the gravel packing working state, from Figure 1 As can be seen, the present invention comprises, from top to bottom, an upper valve cover (14) and a valve body (7), wherein the valve body (7) and the upper valve cover (14) are connected by a threaded connection. The valve body (7) is a regular cylindrical body, and an outer connecting body (9) is connected to the outer wall of the valve body (7). The outer connecting body (9) is disc-shaped and has threads on the outside, so the diameter of the outer connecting body (9) is larger than the diameter of the outer wall of the valve body (7). A guide platform (15) is connected to the inner wall of the valve body (7), and the guide platform (15) is a rectangular parallelepiped. The top surface of the guide platform (15) is the bottom surface of the gravel packing valve inlet (2).

[0023] A spoiler groove (3) is provided on the upper portion of the guide platform (15), and the cross section of the spoiler groove (3) is rectangular. If the direction in which the guide platform (15) extends toward the center of the valve body (7) is defined as the length direction, the length of the spoiler groove (3) is smaller than the width of the guide platform (15).

[0024] The present invention comprises, from the outside to the inside, an outer connecting body (9), a valve body (7), a gravel filling valve (8) and a water control valve (10).

[0025] The gravel filling valve (8) is composed of a functional partition plate (4) and an area surrounded by a valve body (7). The gravel filling valve (8) has a gravel filling valve inlet (2) and a gravel filling valve outlet (5). The cross section of the gravel filling valve inlet (2) is rectangular, and the cross section of the gravel filling valve outlet (5) is annular. The outer diameter of the annular ring is the same as the diameter of the circle on which the inner wall surface of the valve body (7) is located.

[0026] The water control valve (10) includes an area surrounded by two structures: a functional separation plate (4) and an upper valve cover (14); the water control valve (10) has a water control valve inlet (1) and a water control valve outlet (6); the cross section of the water control valve inlet (1) is rectangular; and the area surrounded by the rear end of the functional separation plate (4) constitutes the water control valve outlet (6).

[0027] The length of the water control valve inlet (1) is equal to the length of the gravel filling valve inlet (2); the width of the water control valve inlet (1) is equal to the width of the gravel filling valve inlet (2); the water control valve inlet (1) is parallel to the gravel filling valve inlet (2) and is separated by a functional separation plate (4); the water control valve inlet (1) extends inward to a position directly above the spoiler groove (3); a through hole is provided on the functional separation plate (4) for placing the spoiler (11); the height of the spoiler (11) is greater than the height of the gravel filling valve inlet (2); when lowered, the bottom end of the spoiler (11) is lower than the top of the spoiler groove (3).

[0028] Figure 3 It is a top view of the present invention, from which it can be seen that the water control valve (10) consists of a water control valve inlet (1), a Tesla valve flow channel (13), a funnel flow channel (16) and a water control valve outlet (6); the Tesla valve flow channel (13) consists of a plurality of Tesla valve units (12); the number of Tesla valve units (12) is at least 1 and at most 8; the Tesla valve units (12) are distributed at equal distances along the circumferential direction of the valve body (7); the tail end of the Tesla valve flow channel (13) is connected to the upper part of the funnel flow channel (16); the funnel flow channel (16) consists of an upper conical cone and a lower cylinder; the water control valve outlet (6) is located at the tail end of the funnel flow channel (16); and the outer side of the valve body (7) is an external connection body (9).

[0029] The present invention has two working states, namely gravel filling state and water control state, but the gravel filling state and the water control state cannot exist at the same time.

[0030] Figure 1 This is a front cross-sectional view of the present invention in the gravel packing working state. It can be seen that when the present invention is in the gravel packing state, the upper end of the baffle (11) contacts the top of the water control valve inlet (1), the water control valve inlet (1) is closed, and the gravel packing valve inlet (2) is in an open state. At this time, the fluid enters from the gravel packing valve inlet (2), passes through the guide platform (15), enters the gravel packing valve (8), and then flows out from the annular gravel packing valve outlet (5).

[0031] Figure 2 This is a front cross-sectional view of the present invention in the water control working state. It can be seen that when the present invention is in the water control state, the upper end of the baffle (11) contacts the bottom end of the water control valve inlet (1), the gravel packing valve inlet (2) is closed, and the water control valve inlet (1) is in an open state. At this time, the fluid enters from the water control valve inlet (1), passes through the Tesla valve flow channel (13) and the funnel flow channel (16) in sequence, and finally flows out from the circular water control valve outlet (6).

[0032] Therefore, it should be understood that the above embodiments are only for a clearer understanding of the present invention and are only used to explain the present invention, and are not limited to any details of the embodiments. Those skilled in the art may conceive of any possible embodiments based on the present invention, which should all fall within the scope of protection of the present invention.

Claims

1. A downhole gravel pack water control valve with integrated Tesla valve flow channel, characterized in that: include: Upper valve cover (14), gravel filling valve (8), water control valve (10), baffle (11), baffle groove (3), Tesla valve flow channel (13), functional separation plate (4), valve body (7), external connection body (9), guide platform (15), funnel flow channel (16); The valve body (7) is a regular cylinder; The outer body (9) is disc-shaped and connected to the outer wall of the valve body (7); the outer side of the outer body (9) is threaded; the diameter of the outer body (9) is larger than the diameter of the outer wall of the valve body (7); The guide platform (15) is a rectangular parallelepiped and is connected to the inner wall of the valve body (7); the top surface of the guide platform (15) is the bottom surface of the gravel filling valve inlet (2); The spoiler groove (3) is provided with an upper portion of the guide platform (15); the cross section of the spoiler groove (3) is rectangular; the direction in which the guide platform (15) extends toward the center of the valve body (7) is defined as the length direction, and the length of the spoiler groove (3) is smaller than the width of the guide platform (15); The gravel filling valve (8) is composed of a functional partition plate (4) and an area surrounded by a valve body (7); the gravel filling valve (8) has a gravel filling valve inlet (2) and a gravel filling valve outlet (5); the cross section of the gravel filling valve inlet (2) is rectangular, and the cross section of the gravel filling valve outlet (5) is annular, and the outer diameter of the annular ring is the same as the diameter of the circle on which the inner wall surface of the valve body (7) is located; The water control valve (10) comprises an area surrounded by two structures, namely a functional separation plate (4) and an upper valve cover (14); the water control valve (10) comprises a water control valve inlet (1) and a water control valve outlet (6); the water control valve inlet (1) has a rectangular cross-section; the area enclosed by the rear end of the functional separation plate (4) constitutes the water control valve outlet (6); The length of the water control valve inlet (1) is equal to the length of the gravel filling valve inlet (2); the width of the water control valve inlet (1) is equal to the width of the gravel filling valve inlet (2); the water control valve inlet (1) is parallel to the gravel filling valve inlet (2) and is separated by a functional separation plate (4); The water control valve inlet (1) extends inwardly to a position directly above the spoiler groove (3); a through hole is provided on the functional partition plate (4) for placing a spoiler (11); the spoiler (11) is higher than the gravel filling valve inlet (2); and when lowered, the bottom end of the spoiler (11) is lower than the top of the spoiler groove (3).

2. A downhole gravel pack water control valve with integrated Tesla valve flow channel according to claim 1, characterized in that: The water control valve (10) is composed of a water control valve inlet (1), a Tesla valve flow channel (13), a funnel flow channel (16) and a water control valve outlet (6); the Tesla valve flow channel (13) is composed of a plurality of Tesla valve units (12); the number of Tesla valve units (12) is at least 1 and at most 8; the Tesla valve units (12) are distributed at equal distances along the circumference of the valve body (7); the tail end of the Tesla valve flow channel (13) is connected to the upper part of the funnel flow channel (16); the funnel flow channel (16) is composed of an upper conical cone and a lower cylinder; the water control valve outlet (6) is located at the tail end of the funnel flow channel (16).

3. The downhole gravel pack water control valve with integrated Tesla valve flow channel according to claim 1, characterized in that: The working states are divided into a gravel filling state and a water control state; the gravel filling state and the water control state cannot exist at the same time; when in the gravel filling state, the upper end of the baffle (11) contacts the top end of the water control valve inlet (1); when in the water control state, the upper end of the baffle (11) contacts the bottom end of the water control valve inlet (1).

4. The downhole gravel pack water control valve with integrated Tesla valve flow channel according to claim 1, characterized in that: The surfaces of the valve body (7), the outer body (9), the baffle (11), the upper valve cover (14) and the guide platform (15) are coated with anti-corrosion materials; the valve body (7) and the upper valve cover (14) are connected and matched by threads.

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