Impact-buffering sand control screen pipe for oil field exploitation

Abstract

The invention relates to the technical field of sand control screens, in particular to an impact buffering sand control screen for oilfield exploitation. Comprising a screen pipe base pipe, connecting screen pipes are arranged on the two sides of the screen pipe base pipe correspondingly, screen holes are formed in the screen pipe base pipe and the connecting screen pipes correspondingly, the connecting screen pipes are fixedly connected with ball heads, fixing units are arranged at the two ends of the screen pipe base pipe correspondingly, and each fixing unit comprises four supporting plates evenly distributed in the circumferential direction; the supporting plates are connected to the screen pipe base pipe in a sliding mode, and first springs are fixedly connected between the supporting plates and the screen pipe base pipe. The connecting screen pipe is supported and limited by the multiple supporting plates, so that the connecting screen pipe actively swings relative to the screen pipe base pipe after the extrusion force of protrusions on the inner wall of an oil well on the device reaches the limit, the purpose of reducing the extrusion force borne by the device is achieved, and the possibility of deformation of the device due to extrusion is reduced; and stable transportation of crude oil in the device is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of sand control screen pipes, in particular to an impact-buffered sand control screen pipe for oil field development. Background Art

[0002] The sand screen is an important device used in oil field exploitation. It is mainly used in the wellbore of the oil well to prevent sand from entering the pumping device and ensure the smooth flow of crude oil. In the process of oil field exploitation, drilling equipment is usually used to send the connected sand screen into the predetermined position inside the oil well. After that, the sand screen starts to work and filters the sand to ensure that only crude oil passes through. However, when exploiting broken block oil fields, due to the complexity of geological conditions, directional well technology is usually required to drill holes so that the state of the sand screen in the oil well gradually changes from vertical to horizontal. After placement, the sand screen is placed horizontally in the oil well. Due to the irregular protrusions on the inner wall of the oil well, in the subsequent mining process, the rock and sand layer of the oil field will gradually settle, and the rock and sand layer will drive the protrusions on the inner wall of the oil well to gradually increase the squeezing pressure on the sand screen, causing the sand screen to deform, bend or break. The deformation and bending of the sand screen will hinder the transportation of crude oil and affect the efficiency of crude oil extraction. If the sand screen is damaged, sand and gravel will enter the sand screen and be discharged with the crude oil. The sand and gravel will cause wear on the pumping equipment and reduce the service life of the pumping equipment. Summary of the invention

[0003] Aiming at the problem that the sand control screen pipe in the oil well is easily deformed, bent or damaged due to extrusion, the present invention provides an impact-buffered sand control screen pipe for oil field development.

[0004] The technical implementation scheme of the present invention is: a sand control screen pipe for oil field development with impact buffering, comprising: A sieve tube base pipe, connecting sieve tubes are arranged on both sides of the sieve tube base pipe, sieve holes are arranged on the sieve tube base pipe and the connecting sieve tube, a ball head is fixedly connected to one end of the connecting sieve tube close to the sieve tube base pipe, the ball head is rotatably connected to the sieve tube base pipe, and fixing units are arranged on both ends of the sieve tube base pipe, the fixing units are used to prevent the connecting sieve tube and the sieve tube base pipe from swinging relative to each other, and the fixing units include: Four support plates evenly distributed in the circumferential direction are all slidably connected to the screen tube base pipe, the support plates are used to support the adjacent connected screen tubes, and a first spring is fixedly connected between the support plates and the screen tube base pipe; Four limiting mechanisms are all arranged in the screen tube base pipe and are used to control the movement resistance of the corresponding support plates; The buffer mechanism is arranged in the adjacent connecting screen pipes and is used to reduce the pressure fluctuations occurring in the screen pipe base pipe and the adjacent connecting screen pipes.

[0005] As a preferred embodiment of the present invention, the limiting mechanism includes: An adjusting bolt, threadedly connected in the screen tube base pipe; A limit block is slidably connected in the screen base pipe, a second spring is fixedly connected between the limit block and the adjusting bolt, a blind hole is arranged on the support plate, and the limit block limits the support plate through the blind hole on the support plate.

[0006] As a preferred embodiment of the present invention, there are multiple blind holes on the support plate, and the blind holes on the support plate are provided with inclined surfaces.

[0007] As a preferred embodiment of the present invention, the support plate is fixedly connected with a support bent plate, and the support bent plate is used to auxiliary support the connecting screen pipe. The support bent plate is slidably connected to the screen pipe base pipe, and the maximum diameter of the circle where the four edges of the support bent plates on one side of the screen pipe base pipe are located is greater than the outer diameter of the connecting screen pipe.

[0008] As a preferred embodiment of the present invention, the buffer mechanism comprises: A fixed frame is fixedly connected in the adjacent connecting screen tube, a sliding ring is provided between the fixed frame and the connecting screen tube for sealing sliding connection, the fixed frame, the sliding ring and the inner wall of the connecting screen tube together form an annular cavity, and a third spring is fixedly connected between the sliding ring and the fixed frame.

[0009] As a preferred embodiment of the present invention, the gas in the annular cavity formed by the inner wall of the fixing frame, the sliding ring and the connecting screen tube is an inert gas.

[0010] As a preferred embodiment of the present invention, the fixed frame is slidably connected with a plurality of limit pins, a fourth spring is fixedly connected between the limit pins and the fixed frame, a plurality of blind holes are arranged on the sliding ring, and the limit pins limit the sliding ring through the corresponding blind holes on the sliding ring.

[0011] As the preferred embodiment of the present invention, it also includes: Two flow guiding mechanisms are respectively arranged on both sides of the screen tube base pipe, and are used to pre-guide the crude oil flowing in the screen tube base pipe. The flow guiding mechanism includes: A plurality of first rotating plates are rotatably connected to the screen tube base pipe; A plurality of second rotating plates are rotatably connected to the screen tube base pipe; Two straight plates are both slidably connected to the screen tube base pipe, the projections of the two straight plates on the horizontal plane are cross-shaped, the lower part of the first rotating plate and the lower part of the second rotating plate are both slidably connected to a connecting plate, and the connecting plate is hinged to the adjacent straight plates; Two control components are both arranged in the screen tube base pipe, and are used to respectively control all the first rotating plates to swing in the same direction and all the second rotating plates to swing in the same direction.

[0012] As a preferred embodiment of the present invention, the control component comprises: Four sliding plates are all slidably connected in the screen tube base pipe, the sliding plates are slidably connected to the adjacent support plates, a tension spring is fixedly connected between the sliding plates and the screen tube base pipe, both ends of the straight plate are fixedly connected to fixed blocks, the fixed blocks are provided with inclined surfaces, and the sliding plates are used to squeeze the inclined surfaces corresponding to the fixed blocks.

[0013] As a preferred embodiment of the present invention, the contact surfaces of the sliding plate, the support plate and the support bent plate with the adjacent connecting screen pipes are all arc surfaces with the same curvature, and the radius of the circle where the arc surface lies is the same as the radius of the circle where the center of the connection between the connecting screen pipe and the ball head follows the swing trajectory of the ball head.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The present invention supports and limits the connecting screen pipe through multiple support plates, so that the connecting screen pipe actively swings relative to the screen pipe base pipe after the extrusion force of the protrusion on the inner wall of the oil well on the device reaches the limit, thereby achieving the purpose of reducing the extrusion force on the device, reducing the possibility of deformation of the device due to extrusion, and ensuring the stable transportation of crude oil in the device.

[0015] 2. The present invention can control the resistance of the limit block and the limit support plate by rotating the adjustment bolt, so that the device can adaptively adjust the maximum value of the extrusion force when the device is actively bent according to different geological conditions, thereby improving the applicability of the device.

[0016] 3. The present invention temporarily increases the space in the connecting screen pipe by relative sliding of the sliding ring and the fixed frame, reduces the range of pressure fluctuation in the connecting screen pipe, and reduces the possibility of damage to the connecting screen pipe.

[0017] 4. The present invention guides the crude oil entering the ball head from the screen tube base pipe by deflecting the first rotating plate or the second rotating plate in the flow guide mechanism, so as to pre-deflect the flow direction of the crude oil, reduce the impact force of the crude oil on the ball head, reduce the wear rate of the ball head, and extend the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the internal mechanism of the screen tube base pipe of the present invention; Figure 3 It is a cross-sectional view of the parts connecting the screen tube and the ball head of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the parts at the adjusting bolt and the limit block of the present invention; Figure 5 It is a cross-sectional view of the parts of the fixed frame and the sliding ring of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the parts at the straight plate and the connecting plate of the present invention.

[0019] The accompanying drawings are marked as: 1-screen base pipe, 2-connecting screen pipe, 3-ball head, 4-support plate, 21-adjusting bolt, 22-limiting block, 31-supporting bent plate, 41-fixing frame, 42-sliding ring, 51-limiting pin, 61-first rotating plate, 62-second rotating plate, 63-straight plate, 64-connecting plate, 71-sliding plate, 72-fixing block. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1 -Attached Figure 6 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] Example 1: When the existing oil field exploitation equipment is used to exploit the broken block oil field, irregular protrusions appear on the inner wall of the oil well during the oil field exploitation process. In the subsequent exploitation process, the rock sand layer of the oil field will gradually settle. The rock sand layer will drive the protrusions on the inner wall of the oil well to gradually increase the squeezing pressure on the sand screen, causing the sand screen to deform and bend, hindering the flow of crude oil in the sand screen, and reducing the crude oil extraction efficiency.

[0022] A shock-absorbing oilfield exploitation sand-proof screen pipe, please refer to the attached Figure 1 -Attached Figure 4As shown, it comprises: a sieve tube base pipe 1, connecting sieve tubes 2 are arranged on both sides of the sieve tube base pipe 1, sieve holes are arranged on the sieve tube base pipe 1 and the connecting sieve tube 2, a ball head 3 is fixedly connected to one end of the connecting sieve tube 2 close to the sieve tube base pipe 1, the ball head 3 is rotatably connected to the sieve tube base pipe 1, and fixing units are arranged at both ends of the sieve tube base pipe 1, and the fixing units are used to prevent the connecting sieve tube 2 from swinging relative to the sieve tube base pipe 1, and the fixing units comprise: four supporting plates 4 evenly distributed in the circumferential direction, all of which are slidably connected to the sieve tube base pipe 1, the supporting plates 4 are used to support adjacent connecting sieve tubes 2, and a first spring is fixedly connected between the supporting plates 4 and the sieve tube base pipe 1; four limiting mechanisms are all arranged in the sieve tube base pipe 1, and are used to control the movement resistance of the corresponding supporting plates 4; a buffer mechanism is arranged at the adjacent connecting sieve The pipe 2 is used to reduce the pressure fluctuations in the screen pipe base pipe 1 and the adjacent connected screen pipe 2. The limiting mechanism includes: an adjusting bolt 21, which is threadedly connected to the screen pipe base pipe 1; a limiting block 22, which is slidably connected to the screen pipe base pipe 1, and a second spring is fixedly connected between the limiting block 22 and the adjusting bolt 21. A blind hole is provided on the support plate 4, and the limiting block 22 limits the support plate 4 through the blind holes on the support plate 4. The number of blind holes on the support plate 4 is multiple, and an inclined surface is provided at the blind holes on the support plate 4. The support plate 4 is fixedly connected with a supporting bent plate 31, and the supporting bent plate 31 is used to assist in supporting the connected screen pipe 2. The supporting bent plate 31 is slidably connected to the screen pipe base pipe 1, and the maximum diameter of the circle where the edges of the four supporting bent plates 31 on one side of the screen pipe base pipe 1 are located is greater than the outer diameter of the connected screen pipe 2.

[0023] In the above scheme, the problem that the screen pipe at the large-scale bend of the oil well is easily squeezed and deformed and bent is solved; when the device reaches the end of its service life, it can be directly taken out of the oil well and replaced with a new one and put into the oil well (the old device replaced is scrapped). During the operation of the device in the oil well, the device is placed horizontally as a whole, and the rock sand layer squeezes the device from top to bottom. The subsequent description of the device is as follows Figure 1The direction is based on (that is, the rock sand layer squeezes the device from right to left), and the four support plates 4 are evenly distributed in the circumferential direction on one side of the screen tube base pipe 1. Taking the connection between the upper side connecting screen tube 2 and the screen tube base pipe 1 as an example, the support plate 4 keeps its upper end in contact with the connecting screen tube 2 under the elastic force of the first spring connected thereto, and the four support plates 4 support the connecting screen tube 2 at the same time, so that the connecting screen tube 2 will not drive the ball head 3 to swing relative to the screen tube base pipe 1. Initially, the screen tube base pipe 1 and the two connecting screen tubes 2 are a straight cylinder as a whole, which is convenient for operators to connect multiple devices in sequence and put them into the oil well. A through hole is provided in the ball head 3, and the through hole in the ball head 3 keeps the screen tube base pipe 1 and the connecting screen tube 2 always connected. The screen tube base pipe 1 is a spliced ​​part. When the connecting screen tube 2 swings with the ball head 3, the connecting screen tube 2 and the support plate 3 squeezed by it are connected. The contact point of the support plate 4 gradually shifts from the outer side of the connecting screen tube 2 to the inner side thereof, and an angle is formed between the direction of the extrusion force of the connecting screen tube 2 on the support plate 4 and the moving direction of the support plate 4. The support bent plate 31 is used to assist in supporting the support plate 4 to prevent the support plate 4 from being bent and damaged when the connecting screen tube 2 swings and squeezes the corresponding support plate 4. By rotating the adjusting bolt 21, the resistance of the limit block 22 to limit the movement of the support plate 4 is changed, thereby adjusting the maximum extrusion force borne by the screen tube base pipe 1 and the connecting screen tube 2 when the screen tube base pipe 1 and the connecting screen tube 2 swing relative to each other. The side of the limit block 22 close to the adjacent support plate 4 is hemispherical, and the limit block 22 is inserted into the blind hole of the support plate 4 only through the hemispherical part for limiting. The blind hole of the support plate 4 is hemispherical, and the depth of the blind hole on the support plate 4 is less than the radius of the hemispherical part of the limit block 22.

[0024] Workflow: After the operator completes the directional drilling of the oil field, the operator first turns all the adjusting bolts 21 according to the soil conditions of the oil field, adjusts the compression degree of the second spring connected to the limit block 22, and sets the maximum extrusion pressure (this value is the set value) that the screen base pipe 1 or the connecting screen pipe 2 bears when the screen base pipe 1 and the connecting screen pipe 2 swing relative to each other. After that, the operator assembles the device with other necessary equipment and puts it into the oil well. Then, the operator extracts crude oil at the wellhead through the pumping device. The crude oil flows from bottom to top in the device, and then the oil is continuously pumped. During the crude oil extraction operation in the field, with the change of geology and the movement of soil, the irregular protrusions on the inner wall of the oil well will contact and gradually squeeze the device. The following description will be taken as an example of the screen base pipe 1 being squeezed. The screen base pipe 1 deviates to the left. When the squeezing force on the screen base pipe 1 reaches the set value, taking the ball head 3 on the upper side as an example, the connected screen 2 drives the ball head 3 to swing clockwise (from front to back) relative to the screen base pipe 1, and the connected screen 2 squeezes the support plate 4 on the right side. The support plate 4 moves downward and compresses the first spring connected to it, and the support plate 4 on the left side loses contact with the connected screen 2.

[0025] When the right support plate 4 moves downward, the blind hole on the right support plate 4 squeezes the limit block 22, the limit block 22 moves to the right, the limit block 22 compresses the second spring connected to it, the support plate 4 loses its limit and moves downward, then the limit block 22 contacts the inclined surface of the blind hole adjacent to its upper side, the limit block 22 squeezes the inclined surface on the support plate 4 under the elastic force of the second spring connected to it, the support plate 4 moves downward, the support plate 4 loses contact with the connected screen pipe 2, the limit block 22 is reinserted into the blind hole adjacent to the support plate 4 under the elastic force of the second spring connected to it, and the support plate 4 The plate 4 is re-limited. During the swinging process of the connecting screen pipe 2, the connecting screen pipe 2 contacts the supporting plate 4 again, and the swinging angle of the connecting screen pipe 2 is fixed. The multiple blind holes on the supporting plate 4 are limited in sequence by the limiting block 22, so as to fix the position of the supporting plate 4 in stages, thereby ensuring the stability of the connecting screen pipe 2 in transporting crude oil. By releasing the limit of the connecting screen pipe 2, the connecting screen pipe 2 and the screen pipe base pipe 1 are allowed to swing relative to each other, thereby adapting to and reducing the squeezing of the device by the inner wall of the oil well, ensuring the integrity of the shape of the device, and facilitating the smooth removal of the device from the oil well when the device is subsequently replaced.

[0026] When the device is working, if the crude oil in the oil field fluctuates, resulting in a temporary increase in the crude oil flow entering the screen base pipe 1 and the connecting screen 2, the buffer mechanism will temporarily expand the space in the connecting screen 2, thereby achieving the purpose of reducing the fluctuation of crude oil in the oil field and protecting the safety of the device. When the device is replaced, it can be directly taken out of the oil well.

[0027] Please refer to the attached Figure 2 , Attachment Figure 3 and attached Figure 5 As shown, the buffer mechanism includes: a fixed frame 41, which is fixedly connected in the adjacent connecting screen tube 2, a sliding ring 42 is sealed and slidably connected between the fixed frame 41 and the connecting screen tube 2, the fixed frame 41, the sliding ring 42 and the inner wall of the connecting screen tube 2 together form an annular cavity, a third spring is fixedly connected between the sliding ring 42 and the fixed frame 41, the gas in the annular cavity together formed by the fixed frame 41, the sliding ring 42 and the inner wall of the connecting screen tube 2 is an inert gas, the fixed frame 41 is slidably connected with a plurality of limit pins 51, a fourth spring is fixedly connected between the limit pins 51 and the fixed frame 41, a plurality of blind holes are arranged on the sliding ring 42, and the limit pins 51 limit the sliding ring 42 through the corresponding blind holes on the sliding ring 42.

[0028] In the above scheme, it is intended to solve the problem that if pressure fluctuations occur in the oil field, the crude oil flow entering the sand screen will temporarily increase, and the crude oil in the sand screen will not be discharged in time, which may easily lead to damage to the sand screen; the inert gas in the annular cavity composed of the fixed frame 41, the sliding ring 42 and the inner wall of the connecting screen 2 is used to weaken the influence of high temperature and high pressure in the oil field, and ensure that the inert gas can stably buffer the pressure fluctuations in the device, and the limit pin 51 limits the sliding ring 42, thereby reducing the sensitivity of the sliding ring 42 to buffer the oil pressure fluctuations in the connecting screen 2, and only buffers large changes in oil pressure, thereby reducing the number of compressions of the third spring connected to the sliding ring 42 and extending the service life of related parts at the sliding ring 42.

[0029] Working process: When the crude oil pressure fluctuation in the oil field causes a sudden increase in flow, excess crude oil flows into the screen base pipe 1 and the connecting screen pipe 2. If the crude oil is not discharged from the device in time, taking the sliding ring 42 on the upper side as an example, when the thrust of the crude oil on the sliding ring 42 is greater than the sum of the resistance of the limiting pin 51 limiting the sliding ring 42 and the initial elastic force of the third spring connected to the sliding ring 42, the crude oil will push the sliding ring 42 to move downward, and the sliding ring 42 compresses the third spring connected to it. At the same time, the sliding ring 42 compresses the inert gas in the annular cavity below it to buffer the pressure fluctuation in the device. The blind hole of the sliding ring 42 squeezes the limiting pin 51, and the limiting pin 51 moves and compresses the fourth spring connected to it. The movement of the sliding ring 42 temporarily increases the space in the connecting screen pipe 2, thereby achieving the purpose of reducing the pressure fluctuation in the connecting screen pipe 2 and reducing the probability of damage to the connecting screen pipe 2. When the pressure fluctuation in the connecting screen pipe 2 disappears, when the oil pumping device at the wellhead extracts the crude oil in the device, the pressure in the connecting screen pipe 2 decreases, and the sliding ring 42 moves upward and resets under the elastic force of the inert gas and the third spring connected to it. The limit pin 51 moves and resets under the elastic force of the fourth spring connected to it and is reinserted into the blind hole of the sliding ring 42. The sliding ring 42 is re-limited. At this point, all parts in the device are restored to their initial positions, so that the sliding ring 42 can continuously buffer the pressure fluctuation in the oil field.

[0030] Example 2: Based on Example 1, please refer to the attached Figure 3 , Attachment Figure 4 and attached Figure 6As shown, it also includes: two flow guiding mechanisms, which are respectively arranged on both sides of the screen tube base pipe 1, for pre-guiding the crude oil flowing in the screen tube base pipe 1, and the flow guiding mechanisms include: a plurality of first rotating plates 61, which are all rotatably connected to the screen tube base pipe 1; a plurality of second rotating plates 62, which are all rotatably connected to the screen tube base pipe 1; two straight plates 63, which are both slidably connected to the screen tube base pipe 1, and the projections of the two straight plates 63 on the horizontal plane are cross-shaped, and the lower part of the first rotating plate 61 and the lower part of the second rotating plate 62 are both slidably connected to the connecting plate 64, and the connecting plate 64 is hinged to the adjacent straight plate 63; two control components, which are both arranged in the screen tube base pipe 1, for respectively controlling all the first rotating plates 61 swings in the same direction as all the second rotating plates 62, the control component includes: four sliding plates 71, all of which are slidably connected in the screen tube base pipe 1, the sliding plate 71 is slidably connected to the adjacent support plate 4, a tension spring is fixedly connected between the sliding plate 71 and the screen tube base pipe 1, both ends of the straight plate 63 are fixedly connected to fixed blocks 72, the fixed blocks 72 are provided with inclined surfaces, the sliding plates 71 are used to squeeze the inclined surfaces corresponding to the fixed blocks 72, the contact surfaces of the sliding plates 71, the support plates 4 and the supporting bent plates 31 with the adjacent connected screen tubes 2 are all arc surfaces with the same curvature, and the radius of the circle where the arc surface is located is the same as the radius of the circle where the center of the connection between the screen tube 2 and the ball head 3 follows the swing trajectory of the ball head 3.

[0031] In the above scheme, it is intended to solve the problem that after the connecting screen tube 2 and the ball head 3 swing relative to the screen tube base pipe 1, the flow path of the crude oil in the screen tube base pipe 1, the connecting screen tube 2 and the ball head 3 will be bent, resulting in the inner wall of the ball head 3 being continuously impacted by the crude oil, thereby increasing the wear of the ball head 3; when the connecting screen tube 2 swings due to the squeezing of the inner wall of the oil well, the displacement of the support plate 4 is transmitted to the straight plate 63 through the sliding plate 71, driving the connecting plate 64 to deflect. For example, if the connecting screen tube 2 swings clockwise (from front to back), the right sliding plate 71 moves downward, pushing the straight plate 63 to move left, and the connecting plate 64 causes the first rotating plate 61 to deflect clockwise at a preset angle. The swing angle of the first rotating plate 61 is the same as the swing angle of the connecting screen tube 2, ensuring that the crude oil flows stably into the through hole of the ball head 3, reducing the impact on the ball head 3, so as to attach Figure 1 For example, when the upper connecting screen tube 2 swings left and right, the multiple first rotating plates 61 swing; when the upper connecting screen tube 2 swings forward and backward, the multiple second rotating plates 62 swing, thereby reducing the impact force of crude oil on the inside of the through hole in the ball head 3 and ensuring the service life of the ball head 3.

[0032] Working process: when the rock sand layer naturally settles and squeezes the screen base pipe 1 through the protrusion on the inner wall of the oil well, the connecting screen 2 swings relative to the screen base pipe 1. Taking the clockwise (viewed from front to back) swinging of the connecting screen 2 as an example, the connecting screen 2 squeezes the support plate 4 on the right, and the support plate 4 drives the right sliding plate 71 to move downward. The right sliding plate 71 stretches the tension spring connected to it, and the left support plate 4 loses contact with the connecting screen 2. The left sliding plate 71 moves upward under the tension of the tension spring connected to it (the left sliding plate 71 slides relative to the left support plate 4), and the left sliding plate 71 maintains contact with the connecting screen 2.

[0033] During the downward movement of the right sliding plate 71, the right sliding plate 71 squeezes the inclined surface of the right fixing block 72, and the fixing block 72 drives the upper straight plate 63 to move leftward. The upper straight plate 63 drives all the first rotating plates 61 to swing clockwise (from front to back) through the multiple connecting plates 64 thereon, and the first rotating plates 61 become inclined to the left from top to bottom. The first rotating plates 61 pre-guide the crude oil flowing from the screen base pipe 1 into the through hole of the ball head 3, thereby reducing the speed at which the ball head 3 is worn due to impact.

[0034] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. As long as they do not deviate from the structure of the invention or exceed the protection scope of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A sand control screen for oil field development with impact buffering, characterized in that: include: A sieve tube base pipe (1), wherein connecting sieve tubes (2) are arranged on both sides of the sieve tube base pipe (1), sieve holes are arranged on the sieve tube base pipe (1) and the connecting sieve tube (2), a ball head (3) is fixedly connected to one end of the connecting sieve tube (2) close to the sieve tube base pipe (1), the ball head (3) is rotatably connected to the sieve tube base pipe (1), and fixing units are arranged on both ends of the sieve tube base pipe (1), the fixing units are used to prevent the connecting sieve tube (2) and the sieve tube base pipe (1) from swinging relative to each other, and the fixing units include: Four support plates (4) evenly distributed in the circumferential direction are all slidably connected to the screen tube base pipe (1), the support plates (4) are used to support the adjacent connecting screen tubes (2), and a first spring is fixedly connected between the support plates (4) and the screen tube base pipe (1); Four limiting mechanisms are all arranged in the screen tube base pipe (1) and are used to control the movement resistance of the corresponding support plates (4); A buffer mechanism is arranged in the adjacent connecting screen pipe (2) and is used to reduce pressure fluctuations occurring in the screen pipe base pipe (1) and the adjacent connecting screen pipe (2).

2. The impact-buffered sand control screen for oil field development according to claim 1, characterized in that: The limiting mechanism comprises: An adjusting bolt (21) threadedly connected to the screen tube base pipe (1); A limit block (22) is slidably connected in the screen tube base pipe (1); a second spring is fixedly connected between the limit block (22) and the adjusting bolt (21); a blind hole is provided on the support plate (4); and the limit block (22) limits the support plate (4) through the blind hole on the support plate (4).

3. The impact-buffered sand control screen for oil field development according to claim 2, characterized in that: There are a plurality of blind holes on the support plate (4), and the blind holes on the support plate (4) are provided with inclined surfaces.

4. The impact-buffered sand control screen for oil field development according to claim 3, characterized in that: The support plate (4) is fixedly connected with a support bent plate (31), the support bent plate (31) is used to assist in supporting the connecting screen tube (2), the support bent plate (31) is slidably connected to the screen tube base tube (1), and the maximum diameter of the circle where the edges of the four support bent plates (31) on one side of the screen tube base tube (1) are located is greater than the outer diameter of the connecting screen tube (2).

5. The impact-buffered sand control screen for oil field development according to claim 4, characterized in that: The buffer mechanism comprises: A fixed frame (41) is fixedly connected in the adjacent connecting screen tube (2); a sliding ring (42) is sealed and slidably connected between the fixed frame (41) and the connecting screen tube (2); the fixed frame (41), the sliding ring (42) and the inner wall of the connecting screen tube (2) together form an annular cavity; and a third spring is fixedly connected between the sliding ring (42) and the fixed frame (41).

6. The impact-buffered sand control screen for oil field development according to claim 5, characterized in that: The gas in the annular cavity formed by the inner wall of the fixing frame (41), the sliding ring (42) and the connecting screen tube (2) is an inert gas.

7. The impact-buffered sand control screen for oil field development according to claim 6, characterized in that: The fixed frame (41) is slidably connected to a plurality of limit pins (51), a fourth spring is fixedly connected between the limit pins (51) and the fixed frame (41), a plurality of blind holes are provided on the sliding ring (42), and the limit pins (51) limit the sliding ring (42) through the corresponding blind holes on the sliding ring (42).

8. The impact-buffered sand control screen for oil field development according to claim 7, characterized in that: Also includes: Two flow guiding mechanisms are respectively arranged on both sides of the screen tube base pipe (1) and are used to pre-guide the crude oil flowing in the screen tube base pipe (1). The flow guiding mechanism comprises: A plurality of first rotating plates (61) are all rotatably connected to the screen tube base pipe (1); A plurality of second rotating plates (62) are all rotatably connected to the screen tube base pipe (1); Two straight plates (63) are both slidably connected to the screen tube base pipe (1), the projections of the two straight plates (63) on the horizontal plane are in the shape of a cross, the lower part of the first rotating plate (61) and the lower part of the second rotating plate (62) are both slidably connected to a connecting plate (64), and the connecting plate (64) is hinged to the adjacent straight plate (63); Two control components are both arranged in the screen tube base pipe (1) and are used to respectively control all the first rotating plates (61) to swing in the same direction and all the second rotating plates (62) to swing in the same direction.

9. The impact-buffered sand control screen for oil field development according to claim 8, characterized in that: The control component comprises: Four sliding plates (71) are all slidably connected in the screen tube base pipe (1); the sliding plates (71) are slidably connected to the adjacent support plates (4); a tension spring is fixedly connected between the sliding plates (71) and the screen tube base pipe (1); both ends of the straight plate (63) are fixedly connected to fixed blocks (72); an inclined surface is provided on the fixed block (72); and the sliding plates (71) are used to press the inclined surface corresponding to the fixed block (72).

10. The impact-buffered sand control screen for oil field development according to claim 9, characterized in that: The contact surfaces of the sliding plate (71), the supporting plate (4) and the supporting bent plate (31) with the adjacent connecting screen tube (2) are all arc surfaces with the same curvature, and the radius of the circle where the arc surface is located is the same as the radius of the circle where the center of the connection between the connecting screen tube (2) and the ball head (3) is located along the swing trajectory of the ball head (3).

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