Underground packer with stable supporting performance and using method thereof

Abstract

The invention relates to the technical field of underground packers, in particular to an underground packer with stable supporting performance and a using method thereof.The underground packer comprises a rail center pipe, a filtering assembly is arranged at one end of the rail center pipe, and an upper connector and a lower connector are arranged on the opposite outer walls of the rail center pipe correspondingly; transverse thrust is applied to the slip block through the cone, so that the slip block is expanded to be clamped in the sleeve, meanwhile, longitudinal thrust is applied to the slip block, so that the slip block rotates on the inner wall of the sleeve, and the slip block is clamped on the sleeve more tightly; crude oil can be filtered and sieved through the filtering assembly, meanwhile, a fixed round block drives a filtering sieve plate to eccentrically rotate, and filtering holes in the filtering sieve plate are sequentially ejected out by ejector rods, so that the problem that the filtering holes are blocked by impurities of the crude oil can be effectively solved; meanwhile, the impurities ejected out by the ejector rod in the filtering holes slide down to one side along the inclined surface of the filtering sieve plate, so that the impurities fall into the material collecting shell to be collected.

Description

Technical Field

[0001] The present invention relates to the technical field of downhole packers, and in particular to a downhole packer with stable supporting performance and a use method thereof. Background Art

[0002] Developing horizontal wells is an effective means of exploitation for thin layers, low permeability and small marginal oil and gas reservoirs. For oil and gas reservoirs with extremely low permeability, large seepage resistance and poor connectivity, multi-fracture fracturing technology is usually used to improve the seepage capacity of oil and gas. As an advanced completion technology, horizontal well open hole completion staged fracturing plays a vital 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. At present, this technology has been widely used in many oil fields on land and has achieved remarkable results; However, the current downhole packer mainly relies on the mortise and tenon structure of the slip and the cone to achieve fixation. However, with long-term use, the aging of the device structure may cause the gap between the joints to increase, thereby affecting its support performance and stability.

[0003] For example, the prior art represented by "Oilfield Downhole Packer" (publication number CN112943151B) is a patented technology that provides an oilfield downhole packer, including a lower joint, a follower frame and blades. The lower joint is provided with a follower frame, and the follower frame is provided with multiple blades. Multiple through holes are provided on the multiple blades. The multiple blades are at an acute angle to the end face of the lower joint. The follower frame can rotate around the axis of the lower joint. The multiple blades are used to block the original larger impurities to prevent the packer from being blocked, and the inclination of the multiple blades can also be used to guide the crude oil to reduce the diffusion of the crude oil. The crude oil can also be filtered through the through holes on the multiple blades, and the lower joint can be cleaned by rotating multiple cleaning rods, thereby effectively solving the problems of the prior art. However, its structure still needs to be improved, as follows: In this scheme, multiple blades block the original larger impurities to prevent the packer from being blocked. The multiple blades can also be tilted to guide the crude oil to reduce the diffusion of 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. During the blade filtering process, the through holes are easily blocked by impurities, thereby affecting the fluidity of the crude oil. Since downhole packers are usually deployed in downhole environments, once blocked, it is difficult to clean them in time, resulting in reduced practicality. In order to improve the filtering efficiency of downhole packers for crude oil, a downhole packer with stable support performance and a method of use thereof are needed to improve the above problems. Summary of the invention

[0004] 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.

[0005] To achieve the above object, the present invention provides the following technical solutions: 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] As a preferred solution of the present invention, a fixing rod is installed on the inner wall of the mounting sleeve, wherein two groups of fixing rods are provided and are respectively located on the opposite inner walls of the mounting sleeve, a ring is rotatably connected to the outer wall of the fixing rod, and rotating rod sleeves are rotatably connected to the inner walls opposite to the rings, and a fixed round block is rotatably connected to the inner wall of the rotating rod sleeve, wherein the cross-section of the fixed round block is a convex structure.

[0010] As a preferred scheme of the present invention, one end of the fixed round block is connected to the outer wall of the eccentric crank, and a filter screen plate is installed at the other end of the fixed round block, and filter holes are arranged on the outer wall of the filter screen plate in a rectangular array, and the filter screen plate is located directly above the aggregate shell, and a connecting spring is installed on the bottom outer wall of the filter screen plate, wherein the connecting spring is sleeved on the outer wall of the fixed round block, and a filter bottom plate is installed at one end of the connecting spring, and the filter bottom plate is located directly below the filter screen plate, and top rods are arranged in a rectangular array on the base surface of the filter bottom plate, and the top rods are located directly above the filter holes, and a bottom ring plate is installed directly below the filter bottom plate and on the inner wall of the mounting sleeve, wherein 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.

[0011] As a preferred solution of the present invention, the support assembly includes a vertebral body and a cava seat, the vertebral body is slidably connected to the outer wall of the center tube of the track, and the vertebral body is located on one side of the rubber cylinder, an arc groove is provided in a ring shape on the outer wall of the vertebral body, the cava seat is rotatably connected to the outer wall of the lower joint, and the cava seat is located on the outer wall of the center tube of the track, a limiting groove is provided in a ring shape on the outer wall of the cava seat, cava blocks are arranged on the inner wall of the limiting groove in sequence, a limiting spring is arranged at the bottom of the cava block, one end of the limiting spring is connected to the inner wall of the cava seat, fixed sliding grooves are provided on the outer wall of the cava block in sequence from front to back, and a rubber pad is slidably connected to the inner wall of the fixed sliding groove.

[0012] As a preferred solution of the present invention, a fixed base is embedded in one side of the fixed slide groove and located on the outer wall of the cava block, 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, wherein the limiting rod is located on one side of the arc groove, and the connection between the limiting rod and the arc groove is a sliding connection.

[0013] As a preferred solution of the present invention, the limiting arc grooves are provided in two groups and are respectively located on the opposite outer walls of the lower joint, the slip ring pins are provided in two groups and are respectively located on the opposite outer walls of the track center tube, the eccentric crank includes 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 overlap with each other, and the bottom ring plate and the filter bottom plate form an angle of 45 degrees.

[0014] A method for using a downhole packer with stable support performance, the specific steps are as follows: 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. 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; 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.

[0015] 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.

[0016] 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.

[0017] 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

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side view structural schematic diagram of the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure in the middle; Figure 4 for Figure 2 A magnified schematic diagram of the structure B in the middle; Figure 5 It is a schematic diagram of the structure of the installation sleeve of the present invention; Figure 6 It is a schematic diagram of the structure of the filter assembly of the present invention; Figure 7 For the present invention Figure 5 A side view structural schematic diagram of; Figure 8 for Figure 7 A magnified schematic diagram of the C structure; Fig. 9 for Figure 7 A magnified schematic diagram of the D structure.

[0019] In the figure: 1, track center tube; 2, filter assembly; 201, mounting sleeve; 202, annular slide; 203, sliding housing; 204, impeller; 205, inner housing; 206, eccentric crank; 207, aggregate housing; 208, liquid outlet; 209, fixed column; 210, sleeve; 211, fixed rod; 212, collar; 213, rotating rod sleeve; 214, fixed round block; 215, filter screen; 216, filter hole; 217, connecting spring; 218, filter bottom plate; 2 19. Push rod; 220. Bottom ring plate; 3. Upper joint; 4. Lower joint; 5. Sealing ring; 6. Rubber cylinder; 7. Support assembly; 701. Cone; 702. Cava seat; 703. Arc groove; 704. Limit groove; 705. Cava block; 706. Limit spring; 707. Fixed slide groove; 708. Rubber pad; 709. Fixed base; 710. Limit rod; 711. Fixed spring; 8. Slip ring block; 9. Mounting groove; 10. Straightening block; 11. Limit arc groove; 12. Slip ring pin. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Example: See Figure 1-9 A downhole packer with stable support performance is shown, comprising a track center pipe 1, a filter assembly 2 is arranged at one end of the track center pipe 1, wherein the filter assembly 2 is driven to operate by the squeezing force of crude oil, thereby cleaning the filter holes 216 in the filter assembly 2, an upper joint 3 and a lower joint 4 are arranged on opposite outer walls of the track center pipe 1, wherein the connection mode of the upper joint 3 and the track center pipe 1 is threaded connection, and the connection mode of the lower joint 4 and the track center pipe 1 is sliding connection, a sealing ring 5 is installed on one side of the upper joint 3 and located on the outer wall of the track center pipe 1, wherein the sealing ring 5 is provided in multiple groups and is respectively located on the outer wall of the track center pipe 1, and a rubber cylinder 6 is sequentially arranged on one side of the sealing ring 5 and located on the outer wall of the track center pipe 1, and a support assembly 7 is arranged on the outer wall of the track center pipe 1; 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 a ring 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, wherein the straightening blocks 10 are provided in multiple groups and are respectively located on the inner walls of the mounting groove 9, and the top of the straightening block 10 extends out of the port 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, wherein 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 method between the slip ring pin 12 and the limiting arc groove 11 is a sliding connection.

[0022] In this embodiment, specific reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9The filter assembly 2 includes a mounting sleeve 201, which is mounted at the port of the track center pipe 1. An annular groove 202 is provided on the inner wall of the mounting sleeve 201. A sliding housing 203 is slidably connected to the inner wall of the annular groove 202. An impeller 204 is mounted on the inner wall of the sliding housing 203. An inner housing 205 is provided at one end of the impeller 204. An eccentric crank 206 is mounted on the outer wall of the inner housing 205. A collection housing 207 is embedded in the outer wall of the mounting sleeve 201, wherein the outer wall of the collection housing 207 The liquid outlet holes 208 are arranged in an annular array on the upper surface, and one end of the aggregate shell 207 extends to the inner cavity of the mounting sleeve 201. The fixed columns 209 are arranged in an annular array at the port of the aggregate shell 207. A sleeve 210 is installed at one end of the fixed column 209. A fixed rod 211 is installed on the inner wall of the mounting sleeve 201, wherein two groups of fixed rods 211 are arranged and are respectively located on the opposite inner walls of the mounting sleeve 201. A collar 212 is rotatably connected to the outer wall of the fixed rod 211, and a rotating ring 212 is rotatably connected to the inner walls opposite to the collar 212. The rod sleeve 213 is rotatably connected to the inner wall of the rotating rod sleeve 213 with a fixed round block 214, wherein the cross section of the fixed round block 214 is a convex structure, one end of the fixed round block 214 is connected to the outer wall of the eccentric crank 206, and the other end of the fixed round block 214 is installed with a filter screen plate 215, and the outer wall of the filter screen plate 215 is provided with filter holes 216 in a rectangular array, and the filter screen plate 215 is located directly above the aggregate shell 207, and 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 filter screen plate 215. A filter bottom plate 218 is installed on the outer wall of the fixed round block 214 and one end of the connecting spring 217. 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. A bottom ring plate 220 is installed directly below the filter bottom plate 218 and on the inner wall of the mounting 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.

[0023] In this embodiment, specific reference Figure 1 , Figure 2 , Figure 3 and Figure 4The 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 center tube 1, and the vertebral body 701 is located on one side of the rubber cylinder 6. An arc groove 703 is formed in an annular manner on the outer wall of the vertebral body 701. 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. A limiting groove 704 is formed in an annular manner 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 slip seat 702. On the inner wall, fixed slide grooves 707 are opened on the outer wall of the cava block 705 from front to back, and a rubber pad 708 is slidably connected to the inner wall of the fixed slide groove 707. A fixed base 709 is embedded in one side of the fixed slide groove 707 and located on the outer wall of the cava block 705. A limiting rod 710 is slidably connected to the inner wall of the fixed base 709, and 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, wherein the limiting rod 710 is located on one side of the arc groove 703, and the connection method of the limiting rod 710 and the arc groove 703 is a sliding connection.

[0024] Based on the above structural features and the connection relationship, the limiting arc groove 11 includes a short groove and a long groove, wherein the fixing rod 211 is provided with two groups and is respectively located on the opposite inner walls of the mounting sleeve 201, the outer wall of the fixing rod 211 is rotatably connected with a collar 212, and the inner walls opposite to the collar 212 are respectively rotatably connected with a rotating rod sleeve 213, and the axes of the fixing rod 211 and the rotating rod sleeve 213 form a cross-staggered structure with each other, and the rotating rod sleeve 213 is rotated along the Y axis on the inner wall of the collar 212. The ring 212 rotates along the Z axis on the outer wall of the fixing rod 211. Since a V-shaped cavity from wide to narrow 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 the extrusion force, so that the top rod 219 is always inserted in the inner cavity of the filter hole 216. The top rod 219 also plays a guiding role, so that the top rod 219 is always located directly below the filter hole 216, and the practicability of the device is better. Among them, two groups of limiting arc grooves 11 are provided and are respectively located on the opposite outer walls of the lower joint 4, two groups of slip ring pins 12 are provided and are respectively located on the opposite outer walls of the track center tube 1, the eccentric crank 206 includes a cylindrical base and a crank rod, wherein the axis angle between the cylindrical base and the crank rod is a 45-degree structure, and the axis of the crank rod and the fixed round block 214 overlap with each other, and under the action of the 45-degree structure between the bottom ring plate 220 and the filter bottom plate 218, the filter bottom plate 218 rotates eccentrically.

[0025] 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; 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. As the vertebral body 701 exerts a lateral thrust on the slip block 705, the slip block 705 is stretched open and stuck in the casing. At the same time, the slip block 705 is subjected to a longitudinal thrust, which causes 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; When the downhole packer is used, the crude oil flows through the track center pipe 1. When the crude oil flows through the filter screen 215, the impurities in the crude oil will be filtered and blocked by the filter screen 215. At the same time, when the crude oil flows through the filter assembly 2, the impeller 204 is thrust by the crude oil, so that the impeller 204 drives the sliding housing 203 to rotate on the inner wall of the annular groove 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 sliding housing 203 to rotate. The movable eccentric crank 206 rotates. When the eccentric crank 206 rotates, the eccentric crank 206 rotates eccentrically through the fixed round block 214. At this time, the fixed round block 214 drives the filter screen plate 215 to rotate eccentrically, so that the surface of one side of the filter screen plate 215 always maintains a downwardly inclined surface. When there are impurities blocking the surface of the filter screen plate 215, the flowing crude oil will drive the impurities on the surface of the filter screen plate 215 to slide to one side along the inclined surface, so that the impurities fall into the aggregate shell 207 for collection, and at the same time, the liquid outlet 208 above the aggregate shell 207 will discharge the crude oil; When the filter screen plate 215 is eccentrically rotated, a V-shaped cavity from wide to narrow is formed between the filter screen plate 215 and the bottom ring plate 220 because a bottom ring plate 220 is arranged directly below the filter screen plate 215. When the filter screen plate 215 and the bottom ring plate 220 on one side are located at the tip of the V-shaped cavity, the bottom ring plate 220 will exert an upward extrusion force on the filter bottom plate 218 on one side. Since the filter bottom plate 218 and the filter screen plate 215 are flexibly connected through the connecting spring 217, the filter bottom plate 218 and the filter screen plate 215 are flexibly connected. When the filter bottom plate 218 moves upward, the filter bottom plate 218 drives the push rod 219 to move upward, so that the push rod 219 is inserted into the inner cavity of the filter hole 216 of the filter screen plate 215, and the push rod 219 pushes out the impurities in the filter hole 216 to clean it. At the same time, when the filter screen 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 push rod 219 moves out of the inner cavity of the filter hole 216 of the filter screen plate 215; When the filter screen plate 215 rotates eccentrically, the filter holes 216 on the filter screen plate 215 will be pushed out by the push rod 219 in turn, which can effectively solve the problem of the filter holes 216 being blocked by impurities in the crude oil. At the same time, the impurities in the filter holes 216 pushed out by the push rod 219 slide to one side along the inclined surface of the filter screen plate 215, and the impurities fall into the aggregate shell 207 for collection, thereby solving the problem that the downhole packer is usually deployed in the downhole environment. Once blocked, it is difficult to clean it in time, resulting in reduced practicality.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 by the squeezing force of the crude oil to operate the filter assembly (2), thereby cleaning the filter holes (216) in the filter assembly (2); 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; 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 sleeves (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).

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 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) in sequence, 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) in sequence from front to back, and a rubber pad (708) is slidably connected to the inner wall of the fixed sliding groove (707).

8. A downhole packer with stable support performance according to claim 7, characterized in that: 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.

9. A downhole packer with stable support performance according to claim 8, 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.

10. The method for using a downhole packer with stable support performance according to claim 9, 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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