A flip-type density-sensitive flow control valve

Abstract

The application discloses a turnover density-sensitive flow control valve, which comprises a shell, flow-through nuts are embedded at two ends of the shell, a rotating shaft is arranged between the two flow-through nuts, and a positioning block and a turnover block are arranged on the rotating shaft; the turnover block rotates around the rotating shaft, and the density of the turnover block is between the densities of two fluids to be identified; the turnover density-sensitive flow control valve is sensitive to the density of a flow-through liquid, the density of the turnover block is preset, the relative positions of the turnover block and the positioning block can be used to control the size of a liquid flow channel, thereby realizing flow control and achieving the purpose of controlling water and increasing oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploitation, and particularly relates to a turnover density-sensitive flow control valve. BACKGROUND

[0002] In the process of oil and gas development, horizontal wells are often used to increase the drainage area of the production layer. However, due to the heterogeneity of the reservoir and the difference in fluid properties, the horizontal well is prone to water breakthrough early, which seriously affects the development benefit of the oilfield. At present, there is a self-adaptive flow control valve based on fluid viscosity for water control in horizontal wells, which has certain pertinence for high-viscosity crude oil oilfield exploitation, but is limited in use for low-viscosity crude oil oilfield. Therefore, in order to effectively control the production of water or gas in the oil well and improve the production of crude oil, it is urgent to take effective water control measures during the completion operation. SUMMARY

[0003] The present application provides a turnover density-sensitive flow control valve to solve the problem that the self-adaptive flow control valve based on fluid viscosity is limited in use in low-viscosity crude oil oilfield.

[0004] The present application is achieved by using the following technical solutions.

[0005] A turnover density-sensitive flow control valve comprises an outer shell, two flow-through nuts are embedded at both ends of the outer shell, a rotating shaft is arranged between the two flow-through nuts, and a positioning block and a turnover block are arranged on the rotating shaft; the turnover block rotates around the rotating shaft, and the density of the turnover block is between the densities of two fluids to be identified.

[0006] Further, the flow-through nut is connected with the outer shell through threads.

[0007] Further, the inner middle part of the flow-through nut is connected with a rotating shaft positioning seat, the middle part of the rotating shaft positioning seat forms a rotating shaft positioning hole, and the two ends of the rotating shaft are arranged in the rotating shaft positioning holes of the two flow-through nuts, respectively.

[0008] Further, a plurality of flow-through holes are arranged on the flow-through nut, and the flow-through holes are centrally symmetrically distributed around the rotating shaft positioning hole.

[0009] Further, the turnover block and the positioning block are both semi-cylindrical eccentric structures.

[0010] Further, the density of the positioning block is greater than the densities of the two fluids to be identified.

[0011] The present application has the following beneficial effects.

[0012] The flip-type density-sensitive flow control valve of this invention can adjust the flow rate according to the different densities of the liquids passing through. Taking oil and water as examples, when water, which has a relatively higher density, flows through, the flow rate through the valve body is small; when oil, which has a relatively lower density, flows through, the flow rate through the valve body is large, thereby achieving flow control and achieving the purpose of controlling water and increasing oil production. This invention has an ingenious structure, is highly practical, and is suitable for flow control production operations in horizontal wells. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the flow-through nut of the present invention;

[0015] Figure 3 This is a schematic diagram showing the relative positions of the flipping block and the positioning block in the current-limited state of the present invention;

[0016] Figure 4 This is a schematic diagram showing the relative positions of the flipping block and the positioning block when the present invention is in the open state.

[0017] Among them, 1. Flow nut; 11. Flow hole; 12. Rotary shaft positioning hole; 13. Rotary shaft positioning seat; 2. Outer shell; 21. Inner flow channel; 3. Flip block; 4. Positioning block; 5. Rotary shaft. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figures 1-4 As shown, a flip-type density-sensitive flow control valve includes a flow nut 1, a housing 2, a flip block 3, a positioning block 4, and a rotating shaft 5.

[0020] The two ends of the outer shell 2 are embedded with flow-through nuts 1, which are fixedly connected to the outer shell 2 by threads. The inner middle part of the flow-through nut 1 is connected to the rotating shaft positioning seat 13, and the middle part of the rotating shaft positioning seat 13 forms a rotating shaft positioning hole 12. The flow-through nut 1 of this application is also provided with a plurality of flow-through holes 11, which are centrally symmetrically distributed with the rotating shaft positioning hole 12 as the center. The flow-through holes 11 can provide inlet and outlet channels for fluid.

[0021] An inner flow channel 21 is formed inside the outer shell 2. A rotating shaft 5 is provided inside the inner flow channel 21. The two ends of the rotating shaft 5 are respectively set in the rotating shaft positioning holes 12 of the two flow nuts 1. The flow nuts 1 suspend and support the rotating shaft 5 through the rotating shaft positioning holes 12.

[0022] The rotating shaft 5 is provided with a positioning block 4 and a turnover block 3, and the rotating shaft 5 suspends the turnover block 3 and the positioning block 4. Specifically, the turnover block 3 and the positioning block 4 are both semicylindrical, and a positioning hole is arranged beside a straight line where the center of the semicylindrical is located, and the rotating shaft 5 passes through the positioning holes of the turnover block 3 and the positioning block 4, so as to form an eccentric structure, and the turnover block 3 and the positioning block 4 can rotate freely with the rotating shaft 5 as the center.

[0023] The turnover block 3 of the application is made of a composite material, and the density is between the densities of the required identification fluids. Taking oil and water as an example, the density of the turnover block 3 is less than the density of water and greater than the density of oil. The positioning block 4 is made of a metal material, and the density is greater than the density of the required identification fluid, and the positioning block 4 is always located at the bottom of the valve body.

[0024] The working principle of the application is as follows:

[0025] When the turnover density-sensitive flow control valve is placed downhole, the liquid flows into the valve body through the flow-through nut 1 at one end, flows through the turnover block 3 and the positioning block 4, and then flows out through the flow-through nut 1 at the other end. The positioning block 4 is made of a metal material and is a semicylindrical eccentric structure, and because the density is greater than that of the liquid, the positioning block 4 is always located at the bottom of the valve body. The turnover block 3 is made of a composite material, and the density is between the densities of the two fluids. When the densities of the flow-through liquids are different, the relative positions of the turnover block 3 and the positioning block 4 are changed to change the structure of the inner flow passage 21 and control the flow rate through the valve body. Taking oil and water as an example, the density of the preset turnover block 3 is between the densities of oil and water. When the flow-through liquid is water, the turnover block 3 is turned up and located at the top of the valve body, the semicylindrical structures of the turnover block 3 and the positioning block 4 are combined into a complete cylinder, and a certain plugging is formed on the inner flow passage 21, the flow resistance is increased, and the flow rate is reduced. When the flow-through liquid is oil, the turnover block 3 is turned down and located at the bottom of the valve body, the semicylindrical structures of the turnover block 3 and the positioning block 4 are coincided, a semicircular flow-through channel is formed on the upper part of the inner flow passage 21, the flow resistance is reduced, the flow rate is increased, and the flow rate is controlled by identifying the density of the flow-through liquid, so as to achieve the purpose of controlling water and increasing oil.

[0026] The embodiments of the specific embodiment are the preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, any equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A flip-type density-sensitive flow control valve comprising a housing (2), characterized in that: The both ends of the shell (2) are embedded with flow-through nuts (1), the rotating shaft (5) is arranged between the two flow-through nuts (1), the rotating shaft (5) is provided with a positioning block (4) and a turnover block (3); the turnover block (3) rotates around the rotating shaft (5), and the density of the turnover block (3) is between the densities of the two fluids to be identified; The middle part of the inner side of the flow-through nut (1) is connected with the rotating shaft positioning seat (13), the middle part of the rotating shaft positioning seat (13) forms a rotating shaft positioning hole (12), and the both ends of the rotating shaft (5) are arranged in the rotating shaft positioning holes (12) of the two flow-through nuts (1) respectively; A plurality of flow-through holes (11) are arranged on the flow-through nut (1), and the flow-through holes (11) are centrally symmetrically distributed around the rotating shaft positioning hole (12); The turnover block (3) and the positioning block (4) are both semi-cylindrical eccentric structures. The density of the positioning block (4) is greater than the densities of the two fluids to be identified.

2. The reversing density-sensitive flow control valve of claim 1, wherein: The flow-through nut (1) is connected with the shell (2) through threads.

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