Sand control device for oil production well

Abstract

The application discloses a gravel packing sand prevention device for oil exploitation well and relates to the field of gravel packing of exploitation well.The device comprises a center cylinder provided with an oil inlet hole on the surface and a screen pipe arranged outside the center cylinder, a filling cavity is formed between the center cylinder and the screen pipe, a bottom filter is arranged at the bottom of the screen pipe, an injection connecting pipe is arranged at the top of the screen pipe, vibration vertical grooves are symmetrically arranged on the inner wall of the center cylinder, sliding blocks are slidably connected to the inner wall of the vibration vertical grooves, a containing groove is formed in the bottom of the sliding block, a vibration block is slidably connected to the inner side of the containing groove, a fault-tolerant spring is arranged between the vibration block and the sliding block, and a driving unit is arranged outside the sliding block.The gravel packing sand prevention device for oil exploitation well can effectively drive gravel to vibrate during the gravel filling process through the cooperation between the vibration vertical grooves, the vibration block and the driving unit, the gravel filling is more compact, and the sand prevention effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gravel packing in oil production wells, in particular to a gravel packing sand control device for oil production wells. BACKGROUND

[0002] In oil production operations, especially in the production process of loose sandstone reservoirs, sand production in oil wells is extremely common and harmful. After the formation sand enters the wellbore with the crude oil, it will continuously deposit in the wellbore, causing the effective passage of the wellbore to be reduced, and in severe cases, even causing the wellbore to be completely blocked, forcing the production operation to be interrupted. At the same time, the high-speed flowing formation sand can cause severe wear to the downhole equipment such as the sucker rod and the oil pump, not only shortening the service life of the equipment, but also increasing the frequency of equipment replacement and maintenance, and also causing huge economic losses due to equipment failure downtime. According to statistics, in oil wells with serious sand production, the maintenance cost of the equipment can be 30%-50% higher than that of normal oil wells, and the production efficiency is only 60%-70% of that of normal oil wells.

[0003] Gravel packing sand control technology is one of the mainstream technologies to address the problem of sand production in oil wells, and its core is to fill gravel of a specific specification in the annular space between the wellbore and the formation to build a reliable filtering barrier. In an ideal state, this barrier can effectively block the formation sand from entering the wellbore while ensuring smooth passage of crude oil. However, the current gravel packing sand control device still has many defects that are difficult to overcome in actual operation and use.

[0004] The "vibrating gravel flushing sand control tool" published in the "Oil Production Technology Manual" published by the Petroleum Industry Press in March 1991 has a structure in which a slider is installed every interval on the flushing pipe, and when the surface rotates the downhole string, the slider hits the screen pipe to make the screen pipe vibrate, with the purpose of making the filled gravel real, dense, and having good sand control effect. However, this tool has problems such as the need for the surface to prepare the power for the slider to hit the screen pipe, complex equipment, and inconvenient operation.

[0005] The utility model patent with publication number CN2473332Y discloses a self-powered vibrating packing tool, which, in actual application, uses the reverse flow liquid separated from the gravel as driving force to drive the eccentric block inside the central pipe to rotate, so as to generate a vibrating force inside the central pipe to assist the packing of the gravel and make the packing of the gravel more compact. However, the eccentric block is wrapped by the water flow during rotation and flows out to the outside from bottom to top, so that the kinetic energy generated by the rotation of the eccentric block is easily weakened, and thus the vibrating force actually received by the central pipe is small. Although the vibrating force can play a certain vibrating role on the central pipe, the vibrating force is too small to well assist the vibration of the gravel packing. SUMMARY

[0006] The purpose of this invention is to provide a gravel-filled sand-control device for oil wells to overcome the aforementioned shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a gravel-filled sand-control device for oil wells, comprising a central cylinder with an oil inlet hole on its surface and a screen pipe disposed outside thereon, a filling cavity being formed between the central cylinder and the screen pipe, a bottom filter being disposed at the bottom of the screen pipe, an injection pipe being disposed at the top of the screen pipe, symmetrical vibration vertical grooves being formed on both sides of the inner wall of the central cylinder, a sliding block being slidably connected to the inner wall of the vibration vertical groove, a receiving groove being formed at the bottom of the sliding block, a vibration block being slidably connected to the inner side of the receiving groove, a fault-tolerant spring being installed between the vibration block and the sliding block, and a driving unit being disposed outside the sliding block.

[0008] Furthermore, the drive unit includes a mounting frame installed inside the central cylinder, a reciprocating lead screw installed at the bottom of the mounting frame, a lifting seat externally connected to the reciprocating lead screw, and connecting rods fixedly installed between the two sides of the lifting seat and the sliding block.

[0009] Furthermore, a drive block is coaxially mounted on the bottom of the reciprocating screw, and the drive block has multiple sets of vertically penetrating spiral grooves equidistantly arranged in a circular shape inside. The bottom of the filling cavity has a connecting groove that connects to the bottom end of the central cylinder.

[0010] Furthermore, the drive block is rotatably connected to the inner wall of the central cylinder, and the dimensions of the drive block are adapted to the inner wall of the central cylinder.

[0011] Furthermore, a guide tube is rotatably connected to the outside of the central cylinder, and the guide tube has an adapter hole that matches the oil inlet hole. A drive gear is installed on the outside of the guide tube.

[0012] Furthermore, the outer surface of the central cylinder is provided with an annular groove, the inner wall of the annular groove is provided with a stop block, the inner wall of the guide cylinder is provided with a guide ring adapted to the annular groove, and the guide ring is provided with a limiting groove corresponding to the stop block.

[0013] Furthermore, the outer side of the central cylinder is provided with a convex ring that is adapted to the guide cylinder. The top of the guide cylinder is provided with two threaded grooves corresponding to the position of the limiting groove. The top of the convex ring is provided with a through hole corresponding to the position of the stop block. A locking screw is threadedly connected inside one of the threaded grooves.

[0014] Furthermore, when the stop block abuts against the inner wall of one side of the limiting groove, the through hole corresponds to the position of the threaded groove on the same side, and the adapter hole is connected to the oil inlet hole. When the stop block abuts against the inner wall of the other side of the limiting groove, the through hole corresponds to the position of the threaded groove on the same side, and the adapter hole is offset from the position of the oil inlet hole.

[0015] Furthermore, the upper and lower ends of the inner wall of the vibrating vertical groove are symmetrically provided with receiving grooves, the width of the receiving grooves is greater than the width of the vibrating vertical groove, and the upper and lower ends of the sliding block are symmetrically installed with sealing plates, the sealing plates are slidably connected to the inner side of the receiving grooves, and the shape and size of the sealing plates are adapted to the receiving grooves.

[0016] Compared with the prior art, the gravel packing sand control device for oil wells provided by the present invention has the following beneficial effects:

[0017] 1. This gravel filling and sand control device for oil wells, through the cooperation between the vibrating vertical groove, the vibrating block and the drive unit, can effectively drive the gravel to vibrate during the gravel filling process, making the gravel filling more compact and thus improving its sand control effect.

[0018] 2. This gravel filling and sand control device for oil wells, through the cooperation between the guide tube and the adapter hole, can effectively guide the direction of the liquid during the gravel filling process, thereby ensuring the effective rotation of the drive block and making the vibration of the vibrating block stable.

[0019] 3. This gravel filling and sand control device for oil wells can effectively separate the vibrating block from the liquid during operation through the cooperation between the receiving tank and the sealing plate. This ensures that the flow of the liquid does not hinder the transmission of the vibration force of the vibrating block, so that the gravel can withstand greater vibration force and can be filled more compactly during the filling process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall longitudinal sectional structure provided in an embodiment of the present invention;

[0023] Figure 3 This is a partial cross-sectional view of the guide tube and central tube provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the center cylinder and the guide cylinder in a separated state according to an embodiment of the present invention;

[0025] Figure 5This is a schematic diagram of the transverse cross-sectional structure of the central cylinder and the guide cylinder provided in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Central cylinder; 101. Screen tube; 102. Filling chamber; 103. Bottom filter; 104. Injection pipe; 105. Oil inlet; 2. Vibration vertical groove; 21. Sliding block; 22. Vibration block; 23. Fault-tolerant spring; 3. Mounting bracket; 31. Reciprocating screw; 32. Lifting seat; 33. Connecting rod; 34. Drive block; 35. Spiral groove; 36. Connecting groove; 4. Guide tube; 41. Adaptor hole; 42. Drive gear; 5. Ring groove; 51. Stop block; 52. Guide ring; 53. Restriction groove; 54. Convex ring; 55. Threaded groove; 56. Through hole; 57. Locking screw; 6. Receiving groove; 61. Sealing plate. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Please see Figures 1-5 A gravel-filled sand-control device for oil wells includes a central cylinder 1 with an oil inlet hole 105 on its surface and a screen pipe 101 disposed outside it. A filling cavity 102 is formed between the central cylinder 1 and the screen pipe 101. A bottom filter 103 is disposed at the bottom of the screen pipe 101 and an injection pipe 104 is disposed at the top of the screen pipe 101. Vibration vertical grooves 2 are symmetrically opened on both sides of the inner wall of the central cylinder 1. A sliding block 21 is slidably connected to the inner wall of the vibration vertical groove 2. A receiving groove is opened at the bottom of the sliding block 21. A vibration block 22 is slidably connected to the inner side of the receiving groove. A fault-tolerant spring 23 is installed between the vibration block 22 and the sliding block 21. A drive unit is disposed outside the sliding block 21.

[0030] During operation, liquid mixed with gravel is transported from injection pipe 104 to filling cavity 102. During this process, the sliding block 21 is driven up and down by the drive unit, causing the vibrating block 22 to collide with the bottom of the vibrating vertical groove 2, thereby vibrating the central cylinder 1 and driving the gravel inside the filling cavity 102 to vibrate, so that the gravel can be filled more compactly in the filling cavity 102.

[0031] The specific structure of the drive unit is described below. The drive unit includes a mounting frame 3 installed inside the central cylinder 1. A reciprocating screw 31 is installed at the bottom of the mounting frame 3. A lifting seat 32 is externally connected to the reciprocating screw 31. Connecting rods 33 are fixedly installed between the two sides of the lifting seat 32 and the sliding block 21. A drive block 34 is coaxially installed at the bottom of the reciprocating screw 31. The drive block 34 has multiple sets of vertically penetrating spiral grooves 35 equidistantly arranged in a circular shape inside. A connecting groove 36 connecting the bottom end of the central cylinder 1 is opened at the bottom of the filling cavity 102.

[0032] It should be noted that the drive block 34 is rotatably connected to the inner wall of the central cylinder 1, and the size and specifications of the drive block 34 are adapted to the inner wall of the central cylinder 1, so that the liquid flowing from the bottom upward can only pass through the spiral groove 35, thereby driving the drive block 34 to rotate effectively.

[0033] It should be further explained that the travel distance of the reciprocating screw 31 driving the drive block 34 to move vertically is sufficient to allow the drive block 34 to impact the bottom of the inner wall of the vibrating vertical groove 2. Furthermore, the fault-tolerant spring 23 has a large elastic coefficient, which allows it to compensate for the distance difference between the lifting seat 32 and the vibrating block 22 during the movement of the lifting seat 32. However, it will not significantly affect the impact force between the vibrating block 22 and the inner wall of the vibrating vertical groove 2, resulting in a larger vibration force generated when the vibrating block 22 impacts.

[0034] During operation, the liquid entering the filling cavity 102 enters the interior of the central cylinder 1 through the bottom connecting groove 36 and flows upward from the bottom. The upward-flowing liquid passes through the spiral groove 35, and during the passage, it exerts a continuous thrust on the inner wall of the spiral groove 35, causing the drive block 34 to rotate. The rotation of the drive block 34 drives the reciprocating screw 31 to rotate, so that the lifting seat 32 can continuously move up and down. During its downward movement, it can drive the vibrating block 22 to collide with the bottom of the inner wall of the vibrating vertical groove 2, causing the central cylinder 1 to vibrate and transmitting the vibration force to the gravel in the filling cavity 102.

[0035] Furthermore: a guide cylinder 4 is rotatably connected to the outside of the central cylinder 1, a screen tube 101 is connected to the outside of the guide cylinder 4, an adapter hole 41 is provided on the guide cylinder 4 to match the oil inlet hole 105, and a drive gear 42 is installed on the outside of the guide cylinder 4.

[0036] It should be noted that the drive gear 42 is driven by an external drive source, which can be the transmission source between an external motor and the transmission gear. This transmission method can be selected according to actual needs.

[0037] With the cooperation of the guide tube 4, the oil inlet 105 can be sealed during the gravel filling process, so that the liquid entering the filling cavity 102 can only enter from the bottom of the central cylinder 1 and exit from the top, thereby ensuring that the flow of liquid can drive the drive block 34 to rotate stably.

[0038] Furthermore: an annular groove 5 is formed on the outer surface of the central cylinder 1, a stop block 51 is provided on the inner wall of the annular groove 5, a guide ring 52 adapted to the annular groove 5 is formed on the inner wall of the guide cylinder 4, a limiting groove 53 corresponding to the stop block 51 is formed on the guide ring 52, a convex ring 54 adapted to the guide cylinder 4 is provided on the outside of the central cylinder 1, two threaded grooves 55 corresponding to the position of the limiting groove 53 are formed on the top of the guide cylinder 4, a through hole 56 corresponding to the position of the stop block 51 is formed on the top of the convex ring 54, and a locking screw 57 is threadedly connected inside one of the threaded grooves 55.

[0039] It should be noted that when the stop block 51 abuts against the inner wall of one side of the limiting groove 53, the through hole 56 corresponds to the threaded groove 55 on the same side, and the adapter hole 41 is connected to the oil inlet hole 105. When the stop block 51 abuts against the inner wall of the other side of the limiting groove 53, the through hole 56 corresponds to the threaded groove 55 on the same side, and the adapter hole 41 is offset from the oil inlet hole 105.

[0040] This allows the guide cylinder 4 to be fixedly connected to the central cylinder 1 by the cooperation between the locking screw 57 and the threaded groove 55 after the position of the guide cylinder 4 is adjusted during the gravel filling process or subsequent formal work, thus making the guide cylinder 4 more stable in actual work.

[0041] Furthermore: The upper and lower ends of the inner wall of the vibrating vertical groove 2 are symmetrically provided with receiving grooves 6. The width of the receiving grooves 6 is greater than the width of the vibrating vertical groove 2. The upper and lower ends of the sliding block 21 are symmetrically installed with sealing plates 61. The sealing plates 61 are slidably connected to the inner side of the receiving grooves 6, and the shape and size of the sealing plates 61 are adapted to the receiving grooves 6.

[0042] In actual operation, the vibration vertical groove 2 is effectively sealed by the sealing plate 61, so that the vibration block 22 will not come into direct contact with the liquid, thereby effectively reducing the impact of the liquid flow on the transmission of vibration force of the vibration block 22.

[0043] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A gravel-filled sand-control device for oil wells, comprising a central cylinder (1) with an oil inlet hole (105) on its surface and a screen pipe (101) disposed outside thereon, wherein a filling cavity (102) is formed between the central cylinder (1) and the screen pipe (101), a bottom filter (103) is disposed at the bottom of the screen pipe (101), and an injection connector (104) is disposed at the top of the screen pipe (101), characterized in that, The inner wall of the central cylinder (1) is symmetrically provided with vibration vertical grooves (2) on both sides. A sliding block (21) is slidably connected to the inner wall of the vibration vertical groove (2). A receiving groove is provided at the bottom of the sliding block (21). A vibration block (22) is slidably connected to the inner side of the receiving groove. A fault-tolerant spring (23) is installed between the vibration block (22) and the sliding block (21). A driving unit is provided on the outside of the sliding block (21). The drive unit includes a mounting bracket (3) installed inside the central cylinder (1). A reciprocating screw (31) is installed at the bottom of the mounting bracket (3). A lifting seat (32) is connected to the outside of the reciprocating screw (31). A connecting rod (33) is fixedly installed between the two sides of the lifting seat (32) and the sliding block (21). A drive block (34) is coaxially installed at the bottom of the reciprocating screw (31). The drive block (34) has multiple sets of spiral grooves (35) that are equidistantly arranged in a circular shape inside. A connecting groove (36) that connects to the bottom end of the central cylinder (1) is opened at the bottom of the filling cavity (102).

2. The gravel-filled sand-control device for oil wells according to claim 1, characterized in that, The drive block (34) is rotatably connected to the inner wall of the central cylinder (1), and the size and specifications of the drive block (34) are adapted to the inner wall of the central cylinder (1).

3. The gravel-filled sand-control device for oil wells according to claim 2, characterized in that, The center cylinder (1) is rotatably connected to the outside of the guide cylinder (4), the guide cylinder (4) is provided with an adapter hole (41) that matches the oil inlet hole (105), and a drive gear (42) is installed on the outside of the guide cylinder (4).

4. The gravel-filled sand-control device for oil wells according to claim 3, characterized in that, The outer surface of the central cylinder (1) is provided with an annular groove (5), the inner wall of the annular groove (5) is provided with a stop block (51), the inner wall of the guide cylinder (4) is provided with a guide ring (52) that is compatible with the annular groove (5), and the guide ring (52) is provided with a limiting groove (53) corresponding to the stop block (51).

5. The gravel-filled sand-control device for oil wells according to claim 4, characterized in that, The outer side of the central cylinder (1) is provided with a convex ring (54) that is compatible with the guide cylinder (4). The top of the guide cylinder (4) is provided with two threaded grooves (55) corresponding to the position of the limiting groove (53). The top of the convex ring (54) is provided with a through hole (56) corresponding to the position of the stop block (51). One of the threaded grooves (55) is threaded with a locking screw (57).

6. The gravel-filled sand-control device for oil wells according to claim 5, characterized in that, When the stop (51) abuts against the inner wall of one side of the limiting groove (53), the through hole (56) corresponds to the threaded groove (55) on the same side, and the adapter hole (41) is connected to the oil inlet hole (105). When the stop (51) abuts against the inner wall of the other side of the limiting groove (53), the through hole (56) corresponds to the threaded groove (55) on the same side, and the adapter hole (41) is offset from the oil inlet hole (105).

7. The gravel-filled sand-control device for oil wells according to claim 6, characterized in that, The upper and lower ends of the inner wall of the vibration vertical groove (2) are symmetrically provided with receiving grooves (6). The width of the receiving groove (6) is greater than the width of the vibration vertical groove (2). The upper and lower ends of the sliding block (21) are symmetrically installed with sealing plates (61). The sealing plates (61) are slidably connected to the inner side of the receiving groove (6), and the shape and size of the sealing plates (61) are adapted to the receiving groove (6).

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