An underground packer with stable support performance and its usage method

Abstract

The present invention relates to the technical field of downhole packers, and specifically to a downhole packer with stable supporting performance and a method for using the same, comprising a track center tube, one end of the track center tube being provided with a filter assembly, and upper joints and lower joints being respectively provided on opposite outer walls of the track center tube; the present invention subjects the slip block to a lateral thrust through a vertebral body, which causes the slip block to be stretched and stuck in a casing, and at the same time, the slip block is subjected to a longitudinal thrust, which causes the slip block to rotate on the inner wall of the casing, thereby causing the slip block to be stuck more tightly on the casing; the filter assembly can be used to filter crude oil, and at the same time, since the fixed round block drives the filter screen plate to rotate eccentrically, the filter holes on the filter screen plate are successively pushed out by a push rod, which can effectively solve the problem of the filter holes being blocked by impurities in the crude oil, and at the same time, the impurities in the filter hole pushed out by the push rod slide to one side along the inclined surface of the filter screen plate, thereby causing the impurities to fall into an aggregate shell for collection.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole packers, and specifically to a downhole packer with stable support performance and its usage method. Background Art

[0002] Developing horizontal wells is an effective means for the exploitation of thin-layer, low-permeability, and small marginal oil and gas reservoirs. For those oil and gas reservoirs with extremely low permeability, large seepage resistance, and poor connectivity, multi-fracture fracturing technology is usually adopted to improve the seepage capacity of oil and gas. As an advanced well completion technology, horizontal well open-hole completion staged fracturing plays a crucial role in the development of low-pressure and low-permeability oil and gas fields and has become one of the key measures to increase production. Currently, this technology has been widely applied in many onshore oil fields and achieved remarkable results;

[0003] However, current downhole packers mainly rely on the mortise and tenon structure of slips and cones to achieve fixation. However, with long-term use, the aging of the device structure may lead to an increase in the fitting gap, thereby affecting its support performance and stability.

[0004] Take the prior art represented by "Downhole Packer for Oilfield" (publication number CN112943151B) as an example. In this patented technology, the downhole packer for oilfield includes a lower joint, a follower frame, and blades. The lower joint is provided with a follower frame, and multiple blades are arranged on the follower frame. Multiple through holes are arranged on each of the multiple blades. Each of the multiple blades forms an acute angle with the end face of the lower joint. The follower frame can rotate around the axis of the lower joint. By using multiple blades to block larger original impurities, the packer is prevented from being blocked. The inclination of multiple blades can also be used to guide the crude oil and reduce the diffusion of the crude oil. The crude oil can also be filtered through the through holes on the multiple blades. The cleaning of the lower joint can also be achieved by the rotation of multiple cleaning rods, thus effectively solving the problems of the prior art. However, its structure still needs to be improved, specifically as follows:

[0005] In this solution, multiple blades are used to block larger original impurities to prevent the packer from being blocked. The inclination of multiple blades can be used to guide the crude oil and reduce the diffusion of the crude oil. Finally, the crude oil is filtered through the through holes on the multiple blades. However, the above features do not have a functional structure for cleaning the blades. When the blades are filtering, their through holes are extremely easy to be blocked by impurities, thus affecting the fluidity of the crude oil. Since downhole packers are usually deployed in the downhole environment, once blocked, it is difficult to clean them in a timely manner, resulting in a reduction in practicality. In order to improve the filtration efficiency of downhole packers for crude oil, a downhole packer with stable support performance and its usage method are needed to improve the above problems. Summary of the Invention

[0006] In order to solve the problem that as the downhole packer is used, the aging of the device structure may cause the engagement gap to increase, thereby affecting its supporting performance and stability, the present invention provides a downhole packer with stable supporting performance and a method of using the same to solve the above problem.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A downhole packer with stable supporting performance comprises a track center tube, one end of the track center tube is provided with a filter assembly, wherein the filter assembly is driven to operate by the squeezing force of crude oil, thereby cleaning the filter holes in the filter assembly, an upper joint and a lower joint are respectively provided on the opposite outer walls of the track center tube, wherein the connection mode of the upper joint and the track center tube is a threaded connection, and the connection mode of the lower joint and the track center tube is a sliding connection, a sealing ring is installed on one side of the upper joint and located on the outer wall of the track center tube, wherein the sealing ring is provided in multiple groups and is respectively located on the outer wall of the track center tube, and a rubber cylinder is sequentially provided on one side of the sealing ring and located on the outer wall of the track center tube, and a supporting assembly is provided on the outer wall of the track center tube.

[0009] As a preferred solution of the present invention, a slip ring block is installed on one side of the track center tube and on the outer wall of the lower joint, a mounting groove is provided in a ring shape on the outer wall of the lower joint, and a straightening block is installed on the inner wall of the mounting groove, wherein a plurality of straightening blocks are provided and are respectively located on the inner walls of the mounting groove, and the top of the straightening block extends out of the port of the mounting groove, a limiting arc groove is provided on the outer wall of the lower joint, the inner cavity of the limiting arc groove is located on the outer wall of the track center tube, wherein a slip ring pin is provided on the inner side of the limiting arc groove and on the outer wall of the track center tube, and the connection method between the slip ring pin and the limiting arc groove is a sliding connection.

[0010] As a preferred solution of the present invention, the filter assembly includes a mounting sleeve, which is installed at the port of the track center tube, an annular groove is provided on the inner wall of the mounting sleeve, a sliding shell is slidably connected to the inner wall of the annular groove, an impeller is installed on the inner wall of the sliding shell, an inner shell is provided at one end of the impeller, and an eccentric crank is installed on the outer wall of the inner shell.

[0011] As a preferred solution of the present invention, a collection shell is embedded in the outer wall of the mounting sleeve, wherein liquid outlet holes are arranged in a circular array on the outer wall of the collection shell, and one end of the collection shell extends to the inner cavity of the mounting sleeve, and fixing columns are arranged in a circular array at the port of the collection shell, and a sleeve is installed at one end of the fixing column.

[0012] As a preferred solution of the present invention, fixing rods are installed on the inner wall of the installation sleeve. There are two groups of fixing rods, which are respectively located on the opposite inner walls of the installation sleeve. A collar is rotatably connected to the outer wall of the fixing rod. Rotating rod sleeves are respectively rotatably connected to the opposite inner walls of the collar. A fixed circular block is rotatably connected to the inner wall of the rotating rod sleeve. The cross-section of the fixed circular block is in a convex structure.

[0013] As a preferred solution of the present invention, one end of the fixed circular block is connected to the outer wall of the eccentric crank, and a filter sieve plate is installed at the other end of the fixed circular block. Filter holes are arranged in a rectangular array on the outer wall of the filter sieve plate. The filter sieve plate is located directly above the aggregate housing. A connecting spring is installed on the bottom outer wall of the filter sieve plate. The connecting spring is sleeved on the outer wall of the fixed circular block. A filter bottom plate is installed at one end of the connecting spring. The filter bottom plate is located directly below the filter sieve plate. Thrust rods are arranged in a rectangular array on the base surface of the filter bottom plate, and the thrust rods are located directly above the filter holes. A bottom ring plate is installed on the inner wall of the installation sleeve directly below the filter bottom plate. The bottom ring plate is located directly below the filter bottom plate, and one end of the bottom ring plate is in contact with the filter bottom plate.

[0014] As a preferred solution of the present invention, the support assembly includes a cone and a slip seat. The cone is slidably connected to the outer wall of the track central tube, and the cone is located on one side of the rubber cylinder. Arc-shaped grooves are annularly formed on the outer wall of the cone. The slip seat is rotatably connected to the outer wall of the lower joint, and the slip seat is located on the outer wall of the track central tube. Limiting grooves are annularly formed on the outer wall of the slip seat. Slip blocks are sequentially arranged on the inner wall of the limiting groove. A limiting spring is arranged at the bottom of the slip block. One end of the limiting spring is connected to the inner wall of the slip seat. Fixed sliding grooves are sequentially formed on the outer wall of the slip block from front to back. A rubber pad is slidably connected to the inner wall of the fixed sliding groove.

[0015] As a preferred solution of the present invention, a fixed base is embedded and installed on the outer wall of the slip block on one side of the fixed sliding groove. A limiting rod is slidably connected to the inner wall of the fixed base. A fixed spring is installed on the outer wall of the limiting rod. One end of the fixed spring is connected to the outer wall of the fixed base. The limiting rod is located on one side of the arc-shaped groove, and the connection mode between the limiting rod and the arc-shaped groove is a sliding connection.

[0016] As a preferred solution of the present invention, there are two groups of limiting arc grooves, which are respectively located on the opposite outer walls of the lower joint. There are two groups of slip ring pins, which are respectively located on the opposite outer walls of the track central tube. The eccentric crank includes a cylindrical base and a crank rod. The axis angle between the cylindrical base and the crank rod is 45 degrees, and the axes of the crank rod and the fixed circular block overlap. The included angle between the bottom ring plate and the filter bottom plate is 45 degrees.

[0017] A method for using a downhole packer with stable support performance, the specific steps are as follows:

[0018] Adjust the height of the track center tube so that the straightening block moves along its track groove, driving the slip ring pin to move to the setting position. When the vertebral body moves to one side, the slip block is stretched open and stuck on the installation sleeve. At the same time, the rubber pad is forced to move out of the fixed slide groove and is fixed on the inner wall of the installation sleeve.

[0019] When the vertebral body contacts the limiting rod, the limiting rod moves along the arc groove, driving the slip block to move and rotate in an arc shape, and clamped more tightly on the installation casing. The upper joint and the track center pipe move downward to compress the rubber cylinder, sealing the annular space of the oil casing. The crude oil flows through the track center pipe, and the impurities are filtered through the filter screen plate. The impeller rotates under the thrust of the crude oil, driving the sliding shell and the inner shell to rotate, and then driving the eccentric crank to rotate. The rotation of the eccentric crank causes the filter screen plate to rotate eccentrically, keeping one side surface tilted downward, and the impurities slide along the inclined surface to the aggregate shell for collection;

[0020] At the same time, the liquid outlet discharges crude oil. When the filter screen plate rotates eccentrically, the bottom ring plate applies extrusion force to the filter bottom plate, and the push rod is inserted into the inner cavity of the filter hole to clean impurities. As the filter screen plate rotates, the filter holes are pushed out by the push rod in turn, and the impurities slide along the inclined surface to the aggregate shell for collection.

[0021] Compared with the prior art, the present invention can filter crude oil by arranging a filter assembly in a downhole sealer with stable supporting performance. At the same time, since the fixed round block drives the filter screen plate to rotate eccentrically, the filter holes on the filter screen plate are pushed out by the push rod in turn, which can effectively solve the problem of the filter holes being blocked by impurities in the crude oil. At the same time, the impurities in the filter holes pushed out by the push rod slide to one side along the inclined surface of the filter screen plate, and then the impurities fall into the aggregate shell for collection. At the same time, the liquid outlet above the aggregate shell will discharge the crude oil, thereby solving the problem that during the blade filtering process, the through hole is easily blocked by impurities, thereby affecting the fluidity of the crude oil.

[0022] The present invention can achieve the goal of arranging a support component in a downhole sealer with stable supporting performance, so that when the vertebral body applies a thrust to the slip block toward the outside, the vertebral body will also apply a thrust to the rubber pad, and the rubber pad will slide toward the outside on the inner wall of the fixed slide groove under the force, thereby moving the rubber pad out of the fixed slide groove and fixing the rubber pad on the inner wall of the casing, which will make the device more stable.

[0023] The present invention provides a supporting assembly in a downhole sealer with stable supporting performance, so that when the vertebral body applies a thrust to the cava block toward the outside, the limit rod moves along the inner cavity of the arc groove, causing the limit rod to move in an arc shape, and then the limit rod drives the cava block to move in an arc shape through the fixed base. Since the vertebral body applies a lateral thrust to the cava block, the cava block will be stretched and stuck in the casing. At the same time, the cava block is subjected to a longitudinal thrust, which will cause the cava block to rotate on the inner wall of the casing, and then the cava block is more tightly stuck on the casing, thereby solving the problem that as the use time increases, the aging of the device structure may cause the engagement gap to increase, thereby affecting its supporting performance and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a side view structural schematic diagram of the present invention;

[0026] Figure 3 for Figure 2 A schematic diagram of the enlarged structure in the middle;

[0027] Figure 4 for Figure 2 Middle B is an enlarged schematic diagram of the structure;

[0028] Figure 5 It is a schematic diagram of the structure of the installation sleeve of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the filter assembly of the present invention;

[0030] Figure 7 For the present invention Figure 5 A side view structural schematic diagram of;

[0031] Figure 8 for Figure 7 A magnified schematic diagram of the C structure;

[0032] Figure 9 for Figure 7 A magnified schematic diagram of the D structure.

[0033] In the figure: 1. Orbital central tube; 2. Filter assembly; 201. Mounting sleeve; 202. Annular chute; 203. Sliding housing; 204. Impeller; 205. Inner housing; 206. Eccentric crank; 207. Aggregate housing; 208. Liquid outlet hole; 209. Fixed column; 210. Sleeve; 211. Fixed rod; 212. Collar; 213. Rotating rod sleeve; 214. Fixed round block; 215. Filter sieve plate; 216. Filter hole; 217. Connecting spring; 218. Filter bottom plate; 219. Thrust rod; 220. Bottom ring plate; 3. Upper joint; 4. Lower joint; 5. Sealing ring; 6. Rubber cylinder; 7. Support assembly; 701. Cone; 702. Slip seat; 703. Arc groove; 704. Limit groove; 705. Slip block; 706. Limit spring; 707. Fixed chute; 708. Rubber pad; 709. Fixed base; 710. Limit rod; 711. Fixed spring; 8. Slip ring block; 9. Mounting groove; 10. Centralizing block; 11. Limit arc groove; 12. Slip ring pin. Detailed implementation mode

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Embodiment: Please refer to Figures 1-9 A downhole packer with stable support performance as shown, including an orbital central tube 1. One end of the orbital central tube 1 is provided with a filter assembly 2. The filter assembly 2 is driven to operate by the extrusion force of crude oil, thereby cleaning the filter holes 216 in the filter assembly 2. Upper joints 3 and lower joints 4 are respectively arranged on the outer walls of the opposite sides of the orbital central tube 1. The connection mode between the upper joint 3 and the orbital central tube 1 is threaded connection, and the connection mode between the lower joint 4 and the orbital central tube 1 is sliding connection. A sealing ring 5 is installed on one side of the upper joint 3 and on the outer wall of the orbital central tube 1. A plurality of groups of sealing rings 5 are provided and are respectively located on the outer wall of the orbital central tube 1. A rubber cylinder 6 is sequentially arranged on one side of the sealing ring 5 and on the outer wall of the orbital central tube 1. A support assembly 7 is arranged on the outer wall of the orbital central tube 1;

[0036] On one side of the track center tube 1 and on the outer wall of the lower joint 4, a slip ring block 8 is installed. An installation groove 9 is annularly formed on the outer wall of the lower joint 4. A centralizing block 10 is installed on the inner wall of the installation groove 9. Multiple groups of the centralizing blocks 10 are provided and are respectively located on the inner wall of the installation groove 9. And the top end of the centralizing block 10 extends out of the port of the installation groove 9. A limiting arc groove 11 is formed on the outer wall of the lower joint 4. The inner cavity of the limiting arc groove 11 is on the outer wall of the track center tube 1. A slip ring pin 12 is arranged on the inner side of the limiting arc groove 11 and on the outer wall of the track center tube 1. And the connection mode between the slip ring pin 12 and the limiting arc groove 11 is a sliding connection.

[0037] In this embodiment, specifically refer to Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9, the filtering component 2 includes an installation sleeve 201 which is installed at the port of the track central tube 1. An annular chute 202 is formed on the inner wall of the installation sleeve 201. A sliding housing 203 is slidably connected to the inner wall of the annular chute 202. An impeller 204 is installed on the inner wall of the sliding housing 203. One end of the impeller 204 is provided with an inner housing 205. An eccentric crank 206 is installed on the outer wall of the inner housing 205. An aggregate housing 207 is embedded and installed on the outer wall of the installation sleeve 201. Liquid outlet holes 208 are arranged in a circular array on the outer wall of the aggregate housing 207. One end of the aggregate housing 207 extends into the inner cavity of the installation sleeve 201. Fixed columns 209 are arranged in a circular array at the port of the aggregate housing 207. A sleeve 210 is installed at one end of the fixed column 209. Fixed rods 211 are installed on the inner wall of the installation sleeve 201. There are two groups of fixed rods 211 which are respectively located on the opposite inner walls of the installation sleeve 201. Collar 212 is rotatably connected to the outer wall of the fixed rod 211. Rotating rod sleeves 213 are respectively rotatably connected to the opposite inner walls of the collar 212. A fixed round block 214 is rotatably connected to the inner wall of the rotating rod sleeve 213. The cross-section of the fixed round block 214 is in a convex structure. One end of the fixed round block 214 is connected to the outer wall of the eccentric crank 206. A filter screen plate 215 is installed at the other end of the fixed round block 214. Filter holes 216 are arranged in a rectangular array on the outer wall of the filter screen plate 215. The filter screen plate 215 is located directly above the aggregate housing 207. A connecting spring 217 is installed on the bottom outer wall of the filter screen plate 215. The connecting spring 217 is sleeved on the outer wall of the fixed round block 214. A filter bottom plate 218 is installed at one end of the connecting spring 217. The filter bottom plate 218 is located directly below the filter screen plate 215. Thumb rods 219 are arranged in a rectangular array on the base surface of the filter bottom plate 218. The thumb rods 219 are located directly above the filter holes 216. A bottom ring plate 220 is installed on the inner wall of the installation sleeve 201 directly below the filter bottom plate 218. The bottom ring plate 220 is located directly below the filter bottom plate 218. One end of the bottom ring plate 220 is in contact with the filter bottom plate 218.

[0038] In this embodiment, specifically refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, the support assembly 7 includes a vertebral body 701 and a slip seat 702. The vertebral body 701 is slidably connected to the outer wall of the track central tube 1, and the vertebral body 701 is located on one side of the rubber cylinder 6. An arc-shaped groove 703 is annularly formed on the outer wall of the vertebral body 701. The slip seat 702 is rotatably connected to the outer wall of the lower sub 4, and the slip seat 702 is located on the outer wall of the track central tube 1. A limiting groove 704 is annularly formed on the outer wall of the slip seat 702. Slip blocks 705 are sequentially arranged on the inner wall of the limiting groove 704. A limiting spring 706 is arranged at the bottom of the slip block 705. One end of the limiting spring 706 is connected to the inner wall of the slip seat 702. Fixed sliding grooves 707 are sequentially formed on the outer wall of the slip block 705 from front to back. A rubber pad 708 is slidably connected to the inner wall of the fixed sliding groove 707. A fixed base 709 is embedded and installed on one side of the fixed sliding groove 707 and on the outer wall of the slip block 705. A limiting rod 710 is slidably connected to the inner wall of the fixed base 709. A fixed spring 711 is installed on the outer wall of the limiting rod 710. One end of the fixed spring 711 is connected to the outer wall of the fixed base 709. The limiting rod 710 is located on one side of the arc-shaped groove 703, and the connection mode between the limiting rod 710 and the arc-shaped groove 703 is a sliding connection.

[0039] Under the action of the above structural features and connection relationships, the limiting arc groove 11 includes a short groove and a long groove. Two groups of fixing rods 211 are provided and are respectively located on the opposite inner walls of the installation sleeve 201. A collar 212 is rotatably connected to the outer wall of the fixing rod 211. Rotating rod sleeves 213 are respectively rotatably connected to the opposite inner walls of the collar 212. The axes of the fixing rod 211 and the rotating rod sleeve 213 are crosswise to each other. The rotating rod sleeve 213 rotates along the Y-axis on the inner wall of the collar 212, and at the same time, the collar 212 rotates along the Z-axis on the outer wall of the fixing rod 211. Since a V-shaped cavity that becomes narrower from wide is formed between the filter screen plate 215 and the bottom ring plate 220, when the filter screen plate 215 rotates to the tip of the V-shaped cavity, the filter bottom plate 218 is continuously subjected to extrusion pressure, so that the ejector rod 219 is always inserted into the inner cavity of the filter hole 216. The ejector rod 219 also plays a guiding role at the same time, so that the ejector rod 219 is always located directly below the filter hole 216, and the practicability of the device is better;

[0040] Among them, two groups of limiting arc grooves 11 are provided and are respectively located on the opposite outer walls of the lower sub 4. Two groups of sliding ring pins 12 are provided and are respectively located on the opposite outer walls of the track central tube 1. The eccentric crank 206 includes a cylindrical base and a crank rod. The axis angle between the cylindrical base and the crank rod is a 45-degree structure, and the axes of the crank rod and the fixed round block 214 overlap. Under the action of the 45-degree structure of the included angle between the bottom ring plate 220 and the filter bottom plate 218, the filter bottom plate 218 rotates eccentrically.

[0041] The downhole packer with stable supporting performance and the method for using the same are provided in this scheme. When working, the track center pipe 1 is lifted up according to the required setting height and then lowered, so that the straightening block 10 moves along the track groove of the track center pipe 1. At the same time, the track center pipe 1 drives the slip ring pin 12 to move, so that the slip ring pin 12 moves from the short groove upper dead point of the limiting arc groove 11 to the long groove upper dead point of the setting position limiting arc groove 11. When the vertebral body 701 moves to one side, the vertebral body 701 and the slip block 705 are in contact. , so that the slip block 705 is pushed outward, and then the slip block 705 moves outward on the inner wall of the limiting groove 704, and the slip block 705 is stretched open by the vertebral body 701 and stuck on the sleeve. At the same time, when the slip block 705 is subjected to force, the vertebral body 701 will also apply a thrust to the rubber pad 708, and the rubber pad 708 will slide outward on the inner wall of the fixed slide groove 707, so that the rubber pad 708 moves out of the fixed slide groove 707, and the rubber pad 708 is fixed on the inner wall of the sleeve, which will make the stability of the device better;

[0042] At the same time, when the vertebral body 701 and the limiting rod 710 come into contact, the limiting rod 710 moves on the inner wall of the arc groove 703. Since the limiting rod 710 moves along the inner cavity of the arc groove 703, the limiting rod 710 moves in an arc shape, and then the limiting rod 710 drives the cava block 705 to move in an arc shape through the fixed base 709. When the cava block 705 is subjected to a lateral thrust, the cava block 705 applies a thrust to the cava seat 702, causing the cava seat 702 to rotate on the outer wall of the lower joint 4. Since the vertebral body 701 exerts a lateral thrust on the slip block 705, the slip block 705 will be stretched open and stuck in the casing. At the same time, the slip block 705 is subjected to a longitudinal thrust, which will cause the slip block 705 to rotate on the inner wall of the casing, thereby making the slip block 705 more tightly stuck on the casing. At the same time, the upper joint 3 and the track center pipe 1 move downward together to compress the rubber cylinder 6 to seal the annular space of the oil casing, thereby solving the problem that the aging of the device structure may cause the chimeric gap to increase as the service time increases, thereby affecting its support performance and stability;

[0043] When used through a downhole packer, the crude oil flows through the central pipe 1 of the track. When the crude oil flows through the filter sieve plate 215, the impurities in the crude oil will be filtered and blocked by the filter sieve plate 215. At the same time, when the crude oil flows through the filter assembly 2 and through the impeller 204, the impeller 204 is subjected to the thrust of the crude oil, causing the impeller 204 to drive the sliding housing 203 to rotate on the inner wall of the annular chute 202. When the impeller 204 drives the sliding housing 203 to rotate, the impeller 204 drives the inner housing 205 to rotate. When the inner housing 205 rotates, the inner housing 205 drives the eccentric crank 206 to rotate. When the eccentric crank 206 rotates, the eccentric crank 206 eccentrically rotates through the fixed circular block 214. At this time, the fixed circular block 214 drives the filter sieve plate 215 to eccentrically rotate, so that the surface on one side of the filter sieve plate 215 always maintains an inclined downward surface. When there are blocked impurities on the surface of the filter sieve plate 215, the flowing crude oil will drive the impurities on the surface of the filter sieve plate 215 to slide down along the inclined surface to one side, so that the impurities fall into the aggregate housing 207 for collection. At the same time, the liquid outlet hole 208 above the aggregate housing 207 will discharge the crude oil;

[0044] When the filter sieve plate 215 eccentrically rotates, since there is a bottom ring plate 220 directly below the filter sieve plate 215, a V-shaped cavity that becomes narrower from wide is formed between the filter sieve plate 215 and the bottom ring plate 220. When the filter sieve plate 215 and the bottom ring plate 220 on one side are at the tip of the V-shaped cavity, the bottom ring plate 220 will apply an upward extrusion force to the filter bottom plate 218 on one side. Since the filter bottom plate 218 and the filter sieve plate 215 are flexibly connected through the connecting spring 217, when the filter bottom plate 218 moves upward, the filter bottom plate 218 drives the ejector rod 219 to move upward, causing the ejector rod 219 to insert into the inner cavity of the filter hole 216 of the filter sieve plate 215. The ejector rod 219 will eject the impurities in the filter hole 216 for cleaning. At the same time, when the filter sieve plate 215 on the other side rotates to the open end of the V-shaped cavity, the bottom ring plate 220 disconnects from the filter bottom plate 218 on the other side, and the ejector rod 219 moves out of the inner cavity of the filter hole 216 of the filter sieve plate 215;

[0045] When the filter sieve plate 215 eccentrically rotates, the filter holes 216 on the filter sieve plate 215 will be successively ejected by the ejector rod 219, which can effectively solve the problem that the filter holes 216 are blocked by the impurities in the crude oil. At the same time, the impurities ejected by the ejector rod 219 in the filter holes 216 slide down along the inclined surface of the filter sieve plate 215 to one side, and the impurities fall into the aggregate housing 207 for collection, thus solving the problem that downhole packers are usually deployed in downhole environments. Once blocked, it is difficult to clean in time, resulting in reduced practicality.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A downhole packer with stable support performance, comprising a track center pipe (1), characterized in that: A filter assembly (2) is provided at one end of the track center tube (1), wherein the filter assembly (2) is driven to operate by the squeezing force of the crude oil, thereby cleaning the filter holes (216) in the filter assembly (2), and an upper joint (3) and a lower joint (4) are respectively provided on opposite outer walls of the track center tube (1), wherein the upper joint (3) and the track center tube (1) are connected in a threaded manner, and the lower joint (4) and the track center tube (1) are connected in a sliding manner, and a sealing ring (5) is installed on one side of the upper joint (3) and located on the outer wall of the track center tube (1), wherein a plurality of sealing rings (5) are provided and are respectively located on the outer wall of the track center tube (1), and rubber cylinders (6) are sequentially provided on one side of the sealing ring (5) and located on the outer wall of the track center tube (1), and a support assembly (7) is provided on the outer wall of the track center tube (1); The support assembly (7) comprises a vertebral body (701) and a slip seat (702), wherein the vertebral body (701) is slidably connected to the outer wall of the track center tube (1), and the vertebral body (701) is located on one side of the rubber cylinder (6), and an arc groove (703) is formed in an annular shape on the outer wall of the vertebral body (701), and the slip seat (702) is rotatably connected to the outer wall of the lower joint (4), and the slip seat (702) is located on the outer wall of the track center tube (1), and the slip seat (702) A limiting groove (704) is provided in an annular shape on the outer wall of the limiting groove (704), a slip block (705) is provided on the inner wall of the limiting groove (704), a limiting spring (706) is provided at the bottom of the slip block (705), one end of the limiting spring (706) is connected to the inner wall of the slip seat (702), and fixed sliding grooves (707) are provided on the outer wall of the slip block (705) from front to back, and a rubber pad (708) is slidably connected to the inner wall of the fixed sliding groove (707); A fixed base (709) is embedded and installed on one side of the fixed slide groove (707) and on the outer wall of the slip block (705); a limit rod (710) is slidably connected to the inner wall of the fixed base (709); a fixed spring (711) is installed on the outer wall of the limit rod (710); one end of the fixed spring (711) is connected to the outer wall of the fixed base (709); the limit rod (710) is located on one side of the arc groove (703); and the limit rod (710) and the arc groove (703) are connected in a sliding manner.

2. A downhole packer with stable support performance according to claim 1, characterized in that: A slip ring block (8) is installed on one side of the track center tube (1) and on the outer wall of the lower joint (4); a mounting groove (9) is provided in an annular shape on the outer wall of the lower joint (4); a straightening block (10) is installed on the inner wall of the mounting groove (9); a plurality of straightening blocks (10) are provided and are respectively located on the inner wall of the mounting groove (9); and the top end of the straightening block (10) extends out of the end of the mounting groove (9); a limiting arc groove (11) is provided on the outer wall of the lower joint (4); the inner cavity of the limiting arc groove (11) is located on the outer wall of the track center tube (1); a slip ring pin (12) is provided on the inner side of the limiting arc groove (11) and on the outer wall of the track center tube (1); and the connection between the slip ring pin (12) and the limiting arc groove (11) is a sliding connection.

3. A downhole packer with stable support performance according to claim 2, characterized in that: The filter assembly (2) comprises a mounting sleeve (201), the mounting sleeve (201) being mounted at the port of the track center tube (1), an annular slide groove (202) being provided on the inner wall of the mounting sleeve (201), a sliding housing (203) being slidably connected to the inner wall of the annular slide groove (202), an impeller (204) being mounted on the inner wall of the sliding housing (203), an inner housing (205) being provided at one end of the impeller (204), and an eccentric crank (206) being mounted on the outer wall of the inner housing (205).

4. A downhole packer with stable support performance according to claim 3, characterized in that: An aggregate shell (207) is embedded in the outer wall of the installation sleeve (201), wherein liquid outlet holes (208) are arranged in a ring array on the outer wall of the aggregate shell (207), and one end of the aggregate shell (207) extends to the inner cavity of the installation sleeve (201), and fixing columns (209) are arranged in a ring array at the port of the aggregate shell (207), and a sleeve (210) is installed at one end of the fixing column (209).

5. A downhole packer with stable support performance according to claim 4, characterized in that: A fixing rod (211) is installed on the inner wall of the installation sleeve (201), wherein two groups of fixing rods (211) are provided and are respectively located on opposite inner walls of the installation sleeve (201), a collar (212) is rotatably connected to the outer wall of the fixing rod (211), and a rotating rod sleeve (213) is rotatably connected to the inner walls opposite to the collar (212), and a fixing round block (214) is rotatably connected to the inner wall of the rotating rod sleeve (213), wherein the cross section of the fixing round block (214) is a convex structure.

6. A downhole packer with stable support performance according to claim 5, characterized in that: One end of the fixed round block (214) is connected to the outer wall of the eccentric crank (206), and a filter screen plate (215) is installed at the other end of the fixed round block (214). The outer wall of the filter screen plate (215) is provided with filter holes (216) in a rectangular array. The filter screen plate (215) is located directly above the aggregate shell (207). A connecting spring (217) is installed on the bottom outer wall of the filter screen plate (215), wherein the connecting spring (217) is sleeved on the outer wall of the fixed round block (214). One end of the connecting spring (217) A filter bottom plate (218) is installed, the filter bottom plate (218) is located directly below the filter screen plate (215), top rods (219) are arranged in a rectangular array on the base surface of the filter bottom plate (218), and the top rods (219) are located directly above the filter holes (216), and a bottom ring plate (220) is installed directly below the filter bottom plate (218) and on the inner wall of the installation sleeve (201), wherein the bottom ring plate (220) is located directly below the filter bottom plate (218), and one end of the bottom ring plate (220) is in contact with the filter bottom plate (218).

7. A downhole packer with stable support performance according to claim 6, characterized in that: The limiting arc grooves (11) are provided in two groups and are respectively located on the opposite outer walls of the lower joint (4); the slip ring pins (12) are provided in two groups and are respectively located on the opposite outer walls of the track center tube (1); the eccentric crank (206) comprises a cylindrical base and a crank rod, wherein the axis of the cylindrical base and the crank rod form an angle of 45 degrees, and the axis of the crank rod and the fixed round block (214) overlap each other; and the bottom ring plate (220) and the filter bottom plate (218) form an angle of 45 degrees.

8. The method for using a downhole packer with stable support performance according to claim 7, characterized in that: The steps are as follows: The height of the track center tube (1) is adjusted so that the straightening block (10) moves along its track groove, driving the slip ring pin (12) to move to the sealing position. When the vertebral body (701) moves to one side, the slip block (705) is stretched open and stuck on the installation sleeve (201), and at the same time, the rubber pad (708) is forced to move out of the fixed slide groove (707) and is fixed on the inner wall of the installation sleeve (201); When the vertebral body (701) contacts the limiting rod (710), the limiting rod (710) moves along the arc groove (703), driving the slip block (705) to move and rotate in an arc shape, and to be more tightly clamped on the installation sleeve (201). The upper joint (3) and the track center pipe (1) move downward to compress the rubber cylinder (6), thereby sealing the annular space of the oil casing. The crude oil flows through the track center pipe (1), and impurities are filtered through the filter screen plate (215). The impeller (204) rotates under the thrust of the crude oil, driving the sliding shell (203) and the inner shell (205) to rotate, thereby driving the eccentric crank (206) to rotate. The rotation of the eccentric crank (206) causes the filter screen plate (215) to rotate eccentrically, keeping one side surface inclined downward, and impurities slide along the inclined surface to the aggregate shell (207) for collection; At the same time, the liquid outlet (208) discharges crude oil, and when the filter screen plate (215) rotates eccentrically, the bottom ring plate (220) applies a squeezing force to the filter bottom plate (218), and the push rod (219) is inserted into the inner cavity of the filter hole (216) to clean impurities. As the filter screen plate (215) rotates, the filter holes (216) are pushed out by the push rod (219) in turn, and the impurities slide along the inclined surface to the aggregate shell (207) for collection.

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