Underground water control device

Abstract

The utility model discloses an underground water control device, which belongs to the technical field of oil exploitation and comprises an inner cylinder and an outer cylinder coaxially sleeved outside the inner cylinder and fixedly connected with the inner cylinder, a strip-shaped channel is arranged between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and a first through hole penetrating through the inside and the outside of the outer cylinder is arranged on one side of the outer cylinder in the axial direction. A first through hole penetrating through the inside and the outside of the inner cylinder is formed in one side of the inner cylinder in the axis direction, a second through hole penetrating through the inside and the outside of the inner cylinder is formed in one side of the inner cylinder in the axis direction, the first through hole and the second through hole are not coaxial, and the first through hole, the long-strip-shaped channel and the second through hole form a channel for fluid circulation; the oleophylic and hydrophobic filter material is located between the first through hole and the second through hole, the oleophylic and hydrophobic filter material is arranged between the inner cylinder and the outer cylinder, the purposes of controlling water and retaining oil can be achieved, adjustment can be flexibly conducted according to the actual operation condition, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of oil extraction, in particular to a downhole water control device. Background Art

[0002] During the process of oil extraction, the sandstone oilfield for oil production will enter the extra-high water cut period in the later stage. After the oilfield enters the extra-high water cut period, the remaining oil in the oilfield will be highly dispersed, and the water content of the oil in the oilfield will also increase. Therefore, the difficulty of production will increase. How to stabilize oil production and control water is crucial for oilfield exploitation. Especially in the later stage of horizontal wells, due to factors such as "toe effect", reservoir heterogeneity, reservoir anisotropy and natural fractures, the recovery rate will be seriously affected. Currently, for this problem, an inflow control device is mostly installed on the completion section to generate an additional pressure drop to ensure the uniformity of the inflow profile along the entire horizontal section. For the currently common inflow control devices, the flow channel is fixed. Although it can delay the outflow of water / gas, due to its constant flow resistance level, once a water / gas cone occurs, the low-viscosity water / gas will occupy the entire wellbore and inhibit the flow of the oil phase, resulting in a significant decrease in the oil well production. Summary of the Utility Model

[0003] In view of the above problems, the utility model provides a downhole water control device, which has a simple structure, is convenient for adjusting the flow channel and flow rate, can effectively control the flow rate according to the actual situation, and ensures the stability of production.

[0004] The technical solution of the utility model is as follows:

[0005] A downhole water control device includes an inner cylinder and an outer cylinder coaxially sleeved outside the inner cylinder and fixedly connected. There is a long strip-shaped channel between the inner wall of the outer cylinder and the outer wall of the inner cylinder. One side in the axial direction of the outer cylinder is provided with a first through hole penetrating through the inside and outside of the outer cylinder, and one side in the axial direction of the inner cylinder is provided with a second through hole penetrating through the inside and outside of the inner cylinder. The first through hole and the second through hole are not coaxial. The first through hole, the long strip-shaped channel, and the second through hole form a channel for fluid circulation. A lipophilic and hydrophobic filter material is coaxially arranged at the long strip-shaped channel between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the lipophilic and hydrophobic filter material is located between the first through hole and the second through hole.

[0006] The outer wall of the inner cylinder sequentially includes a first inner cylinder step portion, a second inner cylinder step portion, and a third inner cylinder step portion along its axial direction. The outer diameters of the first inner cylinder step portion, the second inner cylinder step portion, and the third inner cylinder step portion decrease along the axial direction. The inner wall of the outer cylinder sequentially includes a first outer cylinder step portion, a second outer cylinder step portion, and a third outer cylinder step portion along its axial direction. The inner diameters of the first outer cylinder step portion, the second outer cylinder step portion, and the third outer cylinder step portion increase along their axial directions. The inner diameter of the first outer cylinder step portion is in interference fit with the second inner cylinder step portion. The inner diameter of the second outer cylinder step portion is larger than that of the third inner cylinder step portion. The third outer cylinder step portion is in interference fit with the third inner cylinder step portion.

[0007] The first through hole is arranged on one side of the second outer cylinder step portion close to the first outer cylinder step portion, and the second through hole is arranged on one side of the third step portion of the inner cylinder close to the third step portion of the outer cylinder.

[0008] A sealing ring is arranged between the third outer cylinder step portion and the third inner cylinder step portion.

[0009] A socket is coaxially arranged on the inner wall of the first step portion of the inner cylinder.

[0010] The first through holes are a plurality of through holes uniformly distributed in a ring on the outer cylinder. The second through holes are a plurality of through holes uniformly distributed in a ring on the inner cylinder corresponding to the number of the first through holes. The strip-shaped channels are a plurality of strip-shaped channels uniformly distributed in a ring between the inner cylinder and the outer cylinder corresponding to the number of the first through holes.

[0011] The beneficial effects of the present utility model are as follows:

[0012] The opening degree of the flow channel is adjusted by rotating the inner cylinder and the outer cylinder. At the same time, an oil-wetting and water-repellent filter material is arranged, so as to achieve the purpose of controlling water and retaining oil. It can be flexibly adjusted according to the actual operation conditions, and has a simple structure and convenient operation. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the overall structure of a downhole water control device according to an embodiment of the present utility model;

[0014] Figure 2 is a schematic diagram of the inner cylinder structure of a downhole water control device according to an embodiment of the present utility model;

[0015] Figure 3 is a schematic diagram of the outer cylinder structure of a downhole water control device according to an embodiment of the present utility model.

[0016] Description of the Reference Numerals:

[0017] 1 is the inner cylinder, 2 is the outer cylinder, 3 is the long strip-shaped channel, 4 is the oil-loving and water-repellent filter material, 5 is the sealing ring, 11 is the second through hole, 21 is the first through hole, 111 is the first step portion of the inner cylinder, 112 is the second step portion of the inner cylinder, 113 is the third step portion of the inner cylinder, 211 is the first step portion of the outer cylinder, 212 is the second step portion of the outer cylinder, and 213 is the third step portion of the outer cylinder. Specific embodiments

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

[0019] Embodiment:

[0020] As Figures 1-3 As shown, a downhole water control device includes an inner cylinder 1 and an outer cylinder 2 coaxially sleeved outside the inner cylinder 1 and fixedly connected. There is a long strip-shaped channel 3 between the inner wall of the outer cylinder 2 and the outer wall of the inner cylinder 1. A first through hole 21 penetrating through the inside and outside of the outer cylinder 2 is provided on one side of the outer cylinder 2 in the axial direction. A second through hole 11 penetrating through the inside and outside of the inner cylinder 1 is provided on one side of the inner cylinder 1 in the axial direction. The first through hole 21 and the second through hole 11 are not coaxial. The first through hole 21, the long strip-shaped channel 3, and the second through hole 11 form a channel for fluid circulation. An oil-loving and water-repellent filter material 4 is coaxially arranged at the long strip-shaped channel 3 between the inner wall of the outer cylinder 2 and the outer wall of the inner cylinder 1. The oil-loving and water-repellent filter material 4 is located between the first through hole 21 and the second through hole 11.

[0021] The working principle of the above technical solution is as follows:

[0022] Through the oil-loving and water-repellent filter material 4 between the inner wall of the outer cylinder 2 and the long strip-shaped through hole 3 between the outer walls of the inner cylinder 1, the purpose of water control and oil preservation can be achieved. The size of the filter material can be adjusted according to needs. The structure is simple and the operation is convenient.

[0023] The outer wall of the inner cylinder 1 sequentially includes a first inner cylinder step portion 111, a second inner cylinder step portion 112, and a third inner cylinder step portion 113 along its axial direction. The outer diameters of the first inner cylinder step portion 111, the second inner cylinder step portion 112, and the third inner cylinder step portion 113 decrease along the axial direction. The inner wall of the outer cylinder 2 sequentially includes a first outer cylinder step portion 211, a second outer cylinder step portion 212, and a third outer cylinder step portion 213 along its axial direction. The inner diameters of the first outer cylinder step 211 portion, the second outer cylinder step portion 212, and the third outer cylinder step portion 213 increase along their axial directions. The inner diameter of the first outer cylinder step portion 211 is in interference fit with the second inner cylinder step portion 112. The inner diameter of the second outer cylinder step portion 212 is larger than that of the third inner cylinder step portion 113. The third outer cylinder step portion 213 is in interference fit with the third inner cylinder step portion 113. The first through hole 21 is provided on one side of the second outer cylinder step portion 212 close to the first outer cylinder step portion 111. The second through hole 11 is provided on one side of the third inner cylinder step portion 113 of the inner cylinder close to the third outer cylinder step portion 213.

[0024] By setting the stepped structure, the assembly positioning of the inner cylinder 1 and the outer cylinder 2 can be ensured to be accurate, the installation and disassembly are convenient, the connection stability is high, and the water control reliability is high.

[0025] A sealing ring 5 is arranged between the third outer cylinder step portion 213 and the third inner cylinder step portion 113, which can ensure the reliability of the operation and the safety of use.

[0026] A socket is coaxially arranged on the inner wall of the first step portion 111 of the inner cylinder 1, which can ensure the reliability of the connection between the device and the overall pipeline. The connection is made in the form of socket insertion, and the connection stability is high.

[0027] The first through holes 21 are a plurality of through holes evenly distributed in a ring on the outer cylinder, the second through holes 11 are a plurality of through holes evenly distributed in a ring on the inner cylinder 1 corresponding to the number of the first through holes 21, and the strip-shaped channels 3 are a plurality of strip-shaped channels evenly distributed in a ring between the inner cylinder 1 and the outer cylinder 2 corresponding to the number of the first through holes 21. The multi-hole passage has a wide adjustment range and can ensure the uniformity of water control and oil preservation.

[0028] The above embodiments only represent the specific implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A downhole water control device, characterized in that: It comprises an inner cylinder and an outer cylinder coaxially sleeved on the outside of the inner cylinder and fixedly connected, wherein an elongated channel exists between the inner wall of the outer cylinder and the outer wall of the inner cylinder, a first through hole penetrating inside and outside of the outer cylinder is arranged on one side of the axial direction of the outer cylinder, and a second through hole penetrating inside and outside of the inner cylinder is arranged on one side of the axial direction of the inner cylinder, the first through hole and the second through hole are not coaxial, the first through hole, the elongated channel and the second through hole form a channel for fluid circulation, an oleophilic and hydrophobic filter material is coaxially arranged at the elongated channel between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the oleophilic and hydrophobic filter material is located between the first through hole and the second through hole.

2. A downhole water control device according to claim 1, characterized in that: The outer wall of the inner cylinder includes a first inner cylinder step portion, a second inner cylinder step portion and a third inner cylinder step portion in sequence along its axial direction, and the outer diameters of the first inner cylinder step portion, the second inner cylinder step portion and the third inner cylinder step portion decrease along the axial direction; the inner wall of the outer cylinder includes a first outer cylinder step portion, a second outer cylinder step portion and a third outer cylinder step portion in sequence along its axial direction, and the inner diameters of the first outer cylinder step portion, the second outer cylinder step portion and the third outer cylinder step portion increase along the axial direction; the inner diameter of the first outer cylinder step portion of the first outer cylinder is excessively matched with the second inner cylinder step portion, the inner diameter of the second outer cylinder step portion is larger than that of the third inner cylinder step portion, and the third outer cylinder step portion is excessively matched with the third inner cylinder step portion.

3. A downhole water control device according to claim 1 or 2, characterized in that: The first through hole is arranged on a side of the second outer tube step portion close to the first outer tube step portion, and the second through hole is arranged on a side of the inner tube third step portion close to the outer tube third step portion.

4. A downhole water control device according to claim 2, characterized in that: A sealing ring is arranged between the third outer tube step portion and the third inner tube step portion.

5. A downhole water control device according to claim 1 or 2, characterized in that: The inner cylinder is coaxially provided with a socket on the inner wall of the first step portion.

6. A downhole water control device according to claim 1, characterized in that: The first through holes are multiple through holes evenly distributed in an annular shape on the outer cylinder, the second through holes are multiple through holes evenly distributed in an annular shape on the inner cylinder corresponding to the number of the first through holes, and the elongated channels are multiple elongated channels evenly distributed in annular shape between the inner cylinder and the outer cylinder corresponding to the number of the first through holes.

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