High-temperature-resistant and high-sealing-performance underground packer for oil exploitation

Abstract

The invention relates to the technical field of oil exploitation, and discloses a high-temperature-resistant and high-sealing-performance underground packer for oil exploitation, which comprises a shell, a central pipe is fixedly mounted in the shell, a plurality of rubber sleeves are fixedly mounted on the outer wall of the shell, and top rubber rings are fixedly mounted on the outer wall of the shell and positioned below the rubber sleeves; a plurality of second mounting grooves are formed in the outer walls of the top rubber rings, auxiliary assemblies are arranged in the second mounting grooves, a plurality of first abutting blocks and a plurality of second abutting blocks are fixedly connected to the interior of each top rubber ring, and the first abutting blocks and the second abutting blocks are distributed in the top rubber rings at equal intervals; the first abutting block is located on the upper layer of the second abutting block. According to the sealing device, the multiple first abutting blocks and the multiple second abutting blocks are expanded outwards layer by layer through the combination body of the lifting columns and the guide blocks, so that a double-layer sealing layer can be formed between the outer wall of each rubber sleeve and the inner wall of the sleeve, the sealing performance of the rubber sleeves in the using process is further enhanced, and a strong sealing layer is formed.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a downhole packer for oil extraction that is resistant to high temperatures and has strong sealing properties. Background Technology

[0002] Downhole packers are key tools in oil and gas well engineering. Their core function is to seal the annular space between the tubing and casing using an expandable sealing element (rubber sleeve), thereby enabling stratified extraction, production enhancement operations, or plugging operations. Conventional packers typically rely on a single-stage rubber sleeve that expands radially under hydraulic or mechanical action to fit against the inner wall of the casing to form a seal.

[0003] However, insufficient sealing reliability and durability are significant drawbacks of existing technologies. Firstly, a single rubber sleeve is prone to localized creep or damage under extremely high annular pressure differentials, leading to seal failure. Especially at high temperatures, the elastic modulus of the rubber sleeve material decreases, making it more susceptible to being squeezed into casing coupling gaps or undergoing permanent deformation, creating leakage channels. Secondly, the unsealing process is high-risk. After long-term operation downhole, the rubber sleeve often adheres to the inner wall of the casing, making conventional lifting for unsealing difficult and prone to damage to slips or jamming of the tubing. If unsealing is difficult, milling operations are required, which are costly and risky. Therefore, a high-temperature resistant, high-sealing downhole packer for oilfield applications is proposed. Summary of the Invention

[0004] The present invention mainly addresses the technical problems existing in the prior art and provides a downhole packer for oil well drilling with high temperature resistance and strong sealing performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-temperature resistant and highly sealing downhole packer for oil well development, comprising a housing, a central tube fixedly installed inside the housing, multiple rubber sleeves fixedly installed on the outer wall of the housing, a top rubber ring fixedly installed below each rubber sleeve on the outer wall of the housing, multiple second mounting grooves opened on the outer wall of the top rubber ring, auxiliary components being provided inside the multiple second mounting grooves, multiple first and second abutting blocks fixedly connected inside each top rubber ring, the multiple first and second abutting blocks being equidistantly distributed inside the top rubber ring, with the first abutting blocks positioned above the second abutting blocks, the ends of the first and second abutting blocks extending through the wall of the central tube into the interior of the central tube, and a liftable lifting column movably installed inside the central tube.

[0006] Preferably, the auxiliary component includes a mounting rod rotatably mounted inside the second mounting groove, a scraper fixedly mounted on the upper end of the mounting rod, a contact rod fixedly mounted on the inner wall of the mounting rod, the end of the contact rod being a downwardly curved arc, and a pressing rod for cooperating with the contact rod being fixedly mounted on the bottom surface of the top rubber ring.

[0007] Preferably, the upper outer wall of the mounting rod is provided with a first mounting groove, a mounting seat is slidably installed inside the first mounting groove, and a roller is rotatably installed in the mounting seat.

[0008] Preferably, a pressure sensor is fixedly installed at the center of the first mounting groove, and springs are fixedly installed on both sides of the inner wall of the first mounting groove on the pressure sensor, with the other end of the springs fixedly connected to the mounting base.

[0009] Preferably, both ends of the first and second abutting blocks are arc-shaped, and the two ends of the first and second abutting blocks are of different sizes.

[0010] Preferably, the volume of the second abutting block is 1.2 times larger than that of the first abutting block, and the larger end of the first and second abutting blocks is embedded inside the rubber tube, while the smaller end is located inside the central tube.

[0011] Preferably, the scraper is arc-shaped, and the arc of the scraper is the same as the arc of the outer circle of the rubber tube.

[0012] Preferably, a guide block is fixedly installed at the lower end of the lifting column, and the guide block has a frustum-shaped structure that is wider at the top and narrower at the bottom.

[0013] Preferably, there are three sets of lifting columns and guide blocks, and the upper ends of the three sets of lifting columns are all fixedly installed with connecting rods. The upper end of the connecting rod located at the top is fixedly installed with a piston plate, and the upper ends of the other connecting rods are fixedly connected to the bottom surface of the guide block. Beneficial effects

[0014] This invention provides a high-temperature resistant and highly sealing downhole packer for oil well operations. It offers the following advantages: (1) The high temperature resistant and strong sealing oil well packer uses a downhole packer, which uses a combination of lifting column and guide block to push multiple first and second abutment blocks outward layer by layer, so that a double sealing layer can be formed between the outer wall of each rubber tube and the inner wall of the casing, thereby enhancing the sealing performance of the rubber tube during use and forming a strong sealing layer.

[0015] (2) The high-temperature resistant and highly sealing oil well uses a downhole packer. By lifting the housing, the installation rod and scraper are inserted upward between the outer wall of the rubber sleeve and the inner wall of the casing. When the installation rod moves upward, it generates relative displacement with the extrusion rod at the bottom of the rubber sleeve. The extrusion rod and the contact rod work together. When the end of the contact rod is subjected to the downward pressure of the extrusion rod, it can drive the installation rod to tilt and pry the gap between the rubber sleeve and the inner wall of the casing to become larger. The arc-shaped structure at the end of the contact rod makes its end elastic. When the extrusion rod and the contact rod separate, the installation rod can be reset and restored to open outward under the action of the contact rod. The arc-shaped end of the contact rod hooks upward and interacts with the lower end of the extrusion rod, which can prevent the installation rod from opening outward too much. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sealed state of the rubber sleeve of the present invention; Figure 3 This is a schematic diagram of another sealing state of the rubber tube of the present invention; Figure 4 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 5 This is another cross-sectional view of the overall structure of the present invention; Figure 6 This is a schematic diagram of the mounting rod structure of the present invention; Figure 7 This is a schematic diagram showing the use of the extrusion rod and the contact rod in this invention. Figure 8 For the present invention Figure 7 A magnified view of a portion of point A in the middle.

[0019] Legend: 1. Housing; 2. Glue sleeve; 3. Top rubber ring; 4. Auxiliary components; 401. Mounting rod; 402. Contact rod; 403. Scraper; 404. First mounting groove; 405. Pressure sensor; 406. Spring; 407. Roller; 5. Central tube; 6. First abutment block; 7. Second abutment block; 8. Lifting column; 9. Guide block; 10. Connecting rod; 11. Piston plate; 12. Second mounting groove; 13. Extrusion rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 - Figure 8 As shown, a high-temperature resistant and highly sealing downhole packer for oil wells includes a housing 1. A central tube 5 is fixedly installed inside the housing 1. Multiple rubber cylinders 2 are fixedly installed on the outer wall of the housing 1. A top rubber ring 3 is fixedly installed below each rubber cylinder 2 on the outer wall of the housing 1. Multiple second mounting grooves 12 are opened on the outer wall of the top rubber ring 3. Auxiliary components 4 are arranged inside the multiple second mounting grooves 12. Multiple first abutting blocks 6 and second abutting blocks 7 are fixedly connected inside each top rubber ring 3. The multiple first abutting blocks 6 and second abutting blocks 7 are equidistantly distributed inside the top rubber ring 3, and the first abutting blocks 6 are arranged above the second abutting blocks 7. The ends of the first abutting blocks 6 and the second abutting blocks 7 extend through the pipe wall of the central tube 5 into the interior of the central tube 5. A liftable lifting column 8 is movably installed inside the central tube 5. By applying pressure to the upper surface of the piston plate 11 using existing technology, the assemblies of multiple sets of lifting columns 8 and guide blocks 9 move downwards simultaneously. When the assemblies of lifting columns 8 and guide blocks 9 simultaneously press against multiple first abutment blocks 6 located inside the rubber cylinder 2, the multiple first abutment blocks 6 can be pushed outwards simultaneously. The strength of the rubber cylinder 2 is enhanced by the multiple first abutment blocks 6, and the sealing performance between the outer wall of the rubber cylinder 2 and the inner wall of the sleeve is improved during setting by the compression of the multiple first abutment blocks 6. If the sealing performance of the rubber cylinder 2 is still insufficient at this time, or if a stronger sealing performance is required in actual use, The combination of the lifting column 8 and the guide block 9 can be continuously pressed downwards. The lifting column 8 and the guide block 9 simultaneously squeeze multiple second abutting blocks 7 located below the first abutting block 6 outwards. Similarly, by simultaneously squeezing multiple second abutting blocks 7, the lower outer wall of the rubber tube 2 can be simultaneously pushed outwards, enhancing the sealing between the lower outer wall of the rubber tube 2 and the inner wall of the sleeve. At this time, multiple first abutting blocks 6 and multiple second abutting blocks 7 simultaneously push the rubber tube 2 outwards, so that a double seal can be formed between the outer wall of each rubber tube 2 and the inner wall of the sleeve, enhancing the sealing performance of the device during use.

[0022] As a technical optimization of the present invention, the auxiliary component 4 includes a mounting rod 401 rotatably mounted inside the second mounting groove 12. A scraper 403 is fixedly mounted on the upper end of the mounting rod 401, and a contact rod 402 is fixedly mounted on the inner wall of the mounting rod 401. The end of the contact rod 402 is curved downwards. A pressing rod 13 that cooperates with the contact rod 402 is fixedly mounted on the bottom surface of the top rubber ring 3. During the continuous upward movement of the housing 1, the upper end of the scraper 403 is squeezed into the gap between the outer wall of the rubber cylinder 2 and the inner wall of the sleeve, and the pressing rod 13 fixedly mounted on the bottom surface of the rubber cylinder 2 scrapes... As the blade 403 continues to penetrate between the rubber tube 2 and the sleeve, it presses the contact rod 402 downward. The end of the contact rod 402 is arc-shaped. When the end of the contact rod 402 is subjected to downward pressure, the mounting rod 401 rotates around the connection between its lower end and the inner wall of the second mounting groove 12. This allows the scraper 403 and the mounting rod 401 to pry open a larger gap between the outer wall of the rubber tube 2 and the inner wall of the sleeve, thus separating the rubber tube 2 from the sleeve and assisting the rubber tube 2 to retract normally. The scraper 403 moves upward along the inner wall of the sleeve, which can scrape and clean the rubber tube 2 remaining on the inner wall of the sleeve.

[0023] As a technical optimization of the present invention, a first mounting groove 404 is provided on the upper outer wall of the mounting rod 401. A mounting seat is slidably installed inside the first mounting groove 404, and a roller 407 is rotatably installed in the mounting seat. When the inner wall of the sleeve is concave or protrudes outward, the mounting seat will generate a small displacement inside the first mounting groove 404, which will cause the pressure at the output end of the pressure sensor 405 to change. The pressure sensor 405 transmits the signal to the controller. With the help of the display panel, the operator can detect the inner wall of the sleeve before setting.

[0024] As a technical optimization of the present invention, a pressure sensor 405 is fixedly installed at the center of the first mounting groove 404, and springs 406 are fixedly installed on both sides of the inner wall of the first mounting groove 404 on both sides of the pressure sensor 405. The other end of the springs 406 is fixedly connected to the mounting base. The roller 407 rotates inside the mounting base. The springs 406 are arranged between the mounting base and the inner wall of the first mounting groove 404, and the pressure sensor 405 is also arranged inside the first mounting groove 404. The pressure sensor 405 is constantly squeezed. The arrangement of the springs 406 makes the outer wall of the roller 407 always in contact with the inner wall of the sleeve.

[0025] As a technical optimization of the present invention, both ends of the first pressing block 6 and the second pressing block 7 are arc-shaped, and the two ends of the first pressing block 6 and the second pressing block 7 have different volumes. The arc-shaped ends of the first pressing block 6 and the second pressing block 7 facilitate the lifting column 8 to squeeze the first pressing block 6 and the second pressing block 7. On the other hand, the large volume of the ends of the first pressing block 6 and the second pressing block 7 located inside the rubber cylinder 2 can increase the force application area when squeezing the rubber cylinder 2.

[0026] As a technical optimization of the present invention, the volume of the second pressing block 7 is proportionally enlarged by 1.2 times that of the first pressing block 6. The larger end of the first pressing block 6 and the second pressing block 7 is embedded inside the rubber tube 2, and the smaller end is located inside the central tube 5. The shape of the second pressing block 7 is the same as that of the first pressing block 6, and the length of the second pressing block 7 is greater than that of the first pressing block 6. When the ends of multiple second pressing blocks 7 are simultaneously squeezed, the degree to which the rubber tube 2 is stretched outward is greater than the degree to which the rubber tube 2 is stretched outward when the ends of multiple first pressing blocks 6 are squeezed.

[0027] As a technical optimization of the present invention, the scraper 403 is arc-shaped, and the arc of the scraper 403 is the same as the outer arc of the rubber tube 2; the scraper 403 is thin and strong, and when the scraper 403 moves upward, it is squeezed upward along the inner wall of the sleeve and between the rubber tube 2 and the inner wall of the sleeve.

[0028] As a technical optimization of the present invention, a guide block 9 is fixedly installed at the lower end of the lifting column 8. The guide block 9 has a frustum-shaped structure that is wider at the top and narrower at the bottom. The setting of the guide block 9 makes it easier for the combination of the lifting column 8 and the guide block 9 to simultaneously and evenly push the multiple first abutting blocks 6 and the second abutting blocks 7 outward when moving downward.

[0029] As a technical optimization of the present invention, there are three sets of lifting columns 8 and guide blocks 9, and the upper ends of the three sets of lifting columns 8 are all fixedly installed with connecting rods 10. The upper end of the connecting rod 10 located at the top is fixedly installed with a piston plate 11, and the upper ends of the other connecting rods 10 are fixedly connected to the bottom surface of the guide blocks 9. The three sets of lifting columns 8 and guide blocks 9 are connected by the connecting rods 10. When the piston plate 11 is subjected to external pressure, the lifting columns 8 can squeeze the first pressing block 6 and the second pressing block 7, thereby causing the multiple rubber cylinders 2 to be simultaneously pushed outward.

[0030] Working principle of the invention: In operation, the packer is lowered to the preset position downhole via the tubing string. During setting, a sealing ball seat is inserted into the tubing from the wellhead to seal the flow channel of the central tube 5. Subsequently, the surface pump truck applies hydraulic pressure to the tubing string. This pressure acts on the setting piston inside the packer, generating a large downward thrust, which pushes the lower cone downward. Simultaneously, the friction between the friction block outside the packer and the casing wall provides a reaction fulcrum, causing the central tube 5 and the upper cone connected to the piston to move upward relative to each other. The upper and lower cones move towards each other under hydraulic drive, first wedge-like opening the slips with carbide teeth, allowing them to extend radially and anchor against the inner wall of the casing, forming a mechanical lock. Subsequently, the cones continuously compress the elastic sleeve 2 located between the slips, causing it to expand radially until it fits tightly against the inner wall of the casing, forming a high-pressure seal. After the packer is set, the locking mechanism inside the packer automatically engages, permanently maintaining this anchoring and sealing state. Even if the ground hydraulic pressure is removed, the packer can still work effectively. The rubber sleeve 2 must use a special rubber formula, such as hydrogenated nitrile rubber (HNBR), fluororubber (FKM), or perfluoroether rubber (FFKM). These materials have stable molecular structures and can resist thermal and oxidative aging and hardening at high temperatures, ensuring long-lasting elastic sealing performance. Before the packer is set, multiple sets of auxiliary components 4 located inside the second mounting groove 12 on the top rubber ring 3 can detect the smoothness of the inner wall of the sleeve. During the movement of the packer inside the sleeve, the roller 407 located at the upper end of the mounting rod 401 contacts and rolls with the inner wall of the sleeve. The roller 407 rotates inside the mounting seat. A spring 406 is provided between the mounting seat and the inner wall of the first mounting groove 404, and a pressure sensor 405 is also provided inside the first mounting groove 404. The pressure sensor 405 is constantly squeezed. The setting of the spring 406 makes the outer wall of the roller 407 always in contact with the inner wall of the sleeve. When the inner wall of the sleeve is concave or protrudes outward, the mounting seat produces a small displacement inside the first mounting groove 404, which causes the pressure at the output end of the pressure sensor 405 to change. The pressure sensor 405 transmits the signal to the controller (CPM1A PLC controller). With the help of the display panel, the operator can detect the inner wall of the sleeve before setting. During the setting process, multiple rubber cylinders 2 located on the outer wall of the central tube 5 are compressed and deformed. If the elasticity of the rubber cylinders 2 decreases, resulting in insufficient sealing during setting, the operator can apply pressure to the upper surface of the piston plate 11 using existing technology. This causes the assembly of multiple sets of lifting columns 8 and guide blocks 9 to move downwards simultaneously. When the assembly of lifting columns 8 and guide blocks 9 simultaneously presses against multiple first abutting blocks 6 located inside the rubber cylinders 2, the multiple first abutting blocks 6 can be pushed outwards simultaneously. The strength of the rubber cylinders 2 is enhanced by the multiple first abutting blocks 6, and the sealing performance between the outer wall of the rubber cylinders 2 and the inner wall of the sleeve is improved during setting through the compression of the multiple first abutting blocks 6. If the sealing performance of the rubber sleeve 2 is still insufficient, or if a stronger sealing performance is required in actual use, the combination of the lifting column 8 and the guide block 9 can be continuously pressed downwards. The lifting column 8 and the guide block 9 will simultaneously squeeze the multiple second abutting blocks 7 located below the first abutting block 6 outwards. Similarly, by simultaneously squeezing the multiple second abutting blocks 7, the lower outer wall of the rubber sleeve 2 can be simultaneously pushed outwards, enhancing the sealing performance between the lower outer wall of the rubber sleeve 2 and the inner wall of the sleeve. At this time, the multiple first abutting blocks 6 and the multiple second abutting blocks 7 simultaneously push the rubber sleeve 2 outwards, which can form a double seal between the outer wall of each rubber sleeve 2 and the inner wall of the sleeve, enhancing the sealing performance of the device during use. When the packer is used and needs to be released, the tubing string is pulled up. This pulling force first shears the release pin, thereby releasing the locking mechanism. Subsequently, under the continued pulling force, the slips slide off the cone and retract, releasing its radial constraint. At the same time, the compressed rubber sleeve 2 elastically retracts due to the loss of external pressure, returning to its original shape. Finally, the packer as a whole detaches from the casing wall and can be pulled out of the wellbore. If physical jamming or chemical adhesion occurs between the rubber sleeve 2 and the casing wall, it will cause the rubber sleeve 2 to become stuck between the rubber sleeve 2 and the casing wall. At this time, lifting the tubing string will cause the housing 1 to move upward as a whole. If the rubber sleeve 2 is stuck, the rubber sleeve 2 cannot retract normally. During the lifting process of the housing 1, the rubber sleeve 2 is continuously compressed and deformed. Multiple sets of auxiliary components 4 are movably installed on the top rubber ring 3 located below the rubber sleeve 2. The upper end of the scraper 403 included in the auxiliary component 4 is squeezed between the outer wall of the rubber sleeve 2 and the inner wall of the casing during the continuous lifting of the housing 1. The extrusion rod 13, which is fixedly installed on the bottom surface of the rubber sleeve 2, extrudes the contact rod 402 downward as the scraper 403 continues to penetrate between the rubber sleeve 2 and the casing. The end of the contact rod 402 is arc-shaped. When the end of the contact rod 402 is subjected to downward pressure, When pressure is applied, the mounting rod 401 rotates around the connection between its lower end and the inner wall of the second mounting groove 12. This allows the scraper 403 and the mounting rod 401 to pry open a larger gap between the outer wall of the rubber tube 2 and the inner wall of the sleeve, thus separating the rubber tube 2 from the sleeve and assisting the rubber tube 2 to retract normally. The arc-shaped structure at the end of the contact rod 402 makes its end elastic. After the extrusion rod 13 separates from the contact rod 402, the mounting rod 401 can be reset and return to its outward opening under the action of the contact rod 402. The arc-shaped end of the contact rod 402 hooks upward and interacts with the lower end of the extrusion rod 13, which can prevent the mounting rod 401 from opening excessively outward. The scraper 403 moves upward along the inner wall of the sleeve, which can scrape and clean the rubber tube 2 remaining on the inner wall of the sleeve.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant, strong sealing, downhole packer for oil exploration, comprising a shell (1), characterized in that: The inside of the shell (1) is fixedly installed with a central pipe (5), the outer wall of the shell (1) is fixedly installed with a plurality of rubber cylinders (2), the outer wall of the shell (1) is fixedly installed with a plurality of top rubber rings (3) below each rubber cylinder (2), a plurality of second installation grooves (12) are formed in the outer wall of the top rubber ring (3), and an auxiliary assembly (4) is arranged in each second installation groove (12). The inside of each top rubber ring (3) is fixedly connected with a plurality of first abutting blocks (6) and second abutting blocks (7), the plurality of first abutting blocks (6) and second abutting blocks (7) are equidistantly distributed in the inside of the top rubber ring (3), the first abutting block (6) is arranged above the second abutting block (7), the ends of the first abutting block (6) and the second abutting block (7) penetrate the pipe wall of the central pipe (5) and extend into the inside of the central pipe (5), and a liftable lifting column (8) is movably installed in the inside of the central pipe (5).

2. The high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 1, characterized in that: The auxiliary assembly (4) comprises an installation rod (401) rotatably installed in the second installation groove (12), a scraper (403) fixedly installed on the upper end of the installation rod (401), and a contact rod (402) fixedly installed on the inner wall of the installation rod (401). The end of the contact rod (402) is arranged in an arc shape downwardly bent, and the bottom surface of the top rubber ring (3) is fixedly installed with an extrusion rod (13) used in cooperation with the contact rod (402).

3. A high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 2, characterized in that: A first installation groove (404) is formed in the outer wall of the upper end of the installation rod (401), and an installation seat is slidably installed in the first installation groove (404). A roller (407) is rotatably installed in the installation seat.

4. The high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 3, characterized in that: A pressure sensor (405) is fixedly installed at the central position in the first installation groove (404), and springs (406) are fixedly installed on the inner wall of the first installation groove (404) on both sides of the pressure sensor (405). The other end of the spring (406) is fixedly connected with the installation seat.

5. A high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 4, characterized in that: The two ends of the first abutting block (6) and the second abutting block (7) are arranged in an arc shape, and the sizes of the two ends of the first abutting block (6) and the second abutting block (7) are different.

6. A high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 5, characterized in that: The volume of the second abutting block (7) is slightly larger than that of the first abutting block (6), the larger end of the first abutting block (6) and the second abutting block (7) is embedded in the inside of the rubber cylinder (2), and the smaller end is arranged in the inside of the central pipe (5).

7. A high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 6, characterized in that: The scraper (403) is arranged in an arc shape, and the curvature of the scraper (403) is the same as the outer curvature of the rubber cylinder (2).

8. The high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 7, characterized in that: The lower end of the lifting column (8) is fixedly installed with a guide block (9) in a circular table shape with the upper part being wide and the lower part being narrow.

9. The high temperature resistant and high sealing performance downhole packer for oil exploitation according to claim 8, characterized in that: The number of the lifting column (8) and the guide block (9) is three groups, the upper end of each of the three groups of lifting columns (8) is fixedly installed with a connecting rod (10), the upper end of the uppermost connecting rod (10) is fixedly installed with a piston plate (11), and the upper end of the remaining connecting rods (10) is fixedly connected with the bottom surface of the guide block (9).

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