An adjustable packer for oil production wells and a method of using the same

Abstract

The present application relates to a kind of adjustable packer of oil extraction oil well and its using method, including center tube, the bottom end of the center tube is equipped with joint, the outside of the center tube is rotatably installed with auxiliary mechanism, the outside of the center tube is sequentially installed with adjusting ring, several rubber cylinders, setting seat, cone and slip seat, several the rubber cylinder is separated by spacer ring, several slips are rotatably installed on the slip seat, and one end of slip is matched with cone, and the other end of slip is connected by first spring with slip seat;Motor work drives gear rotation, cooperates with the external gear of meshing, simultaneously through roller cooperation, drives the overall rotation of auxiliary mechanism, and the inner wall is cleaned in the process of continuously rotating cleaning scraper, and the impurities cleaned along the inclined cleaning scraper move downward, when auxiliary mechanism moves downward, push impurities to move downward, clean out the well wall area matched with rubber cylinder, avoid the influence damage of the impurities on well wall to compressed expansion rubber cylinder.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to an adjustable packer for oil wells and its usage method. Background Technology

[0002] Downhole tools are connected to the downhole tubing string and used to seal the annular space between the tubing and the oil / gas well casing or open hole.

[0003] Packers achieve sealing by compressing and expanding a rubber sleeve to contact the inner wall of the oil well. However, the inner wall of the oil well often has a large amount of sand and gravel adhering to it. When the compressed rubber sleeve comes into direct contact with sand and gravel, it is very easy to cause scratches and cracks on the outside of the rubber sleeve, which will lead to the failure of the rubber sleeve and the inability to achieve the sealing function. Once the rubber sleeve fails, it needs to be replaced, which increases costs. Summary of the Invention

[0004] The problem solved by this invention is to provide an adjustable packer for oil wells and its usage method. It solves the technical problem that the packer achieves sealing by compressing and expanding the rubber sleeve to contact the inner wall of the oil well. However, the inner wall of the oil well is often covered with a large amount of sand and gravel and other impurities. When the compressed rubber sleeve comes into direct contact with the sand and gravel and other impurities, it is very easy to cause scratches and cracks on the outside of the rubber sleeve, which will lead to the failure of the rubber sleeve and the inability to achieve the sealing function. Moreover, once the rubber sleeve fails, it needs to be replaced, which increases the cost.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An adjustable packer for oil wells includes a central tube with a connector at its bottom end. An auxiliary mechanism is rotatably mounted on the outside of the central tube. An adjusting ring, several rubber sleeves, a setting seat, a cone, and a slip seat are sequentially mounted on the outside of the central tube. The rubber sleeves are separated by spacer rings. Several slips are rotatably mounted on the slip seat, with one end of each slip engaging with the cone and the other end connected to the slip seat via a first spring. A protective cap is mounted on the slip seat, and a sliding ring, which is slidably fitted onto the outside of the central tube, is installed inside the protective cap. Several sliding pins are mounted on the sliding ring, and these pins move along a track groove formed on the outer wall of the central tube.

[0007] Preferably, the auxiliary mechanism includes a ring seat fitted on the outside of the central tube, and the inner diameter of the ring seat is adapted to the outer diameter of the central tube. The bottom side of the ring seat is provided with a plurality of arc-shaped rails and straight rails at equal angles, and the arc-shaped rails and straight rails are arranged alternately.

[0008] Preferably, an arc-shaped slider is slidably mounted on the arc-shaped rail, and several arc-shaped sliders are connected to the rotating ring, and several arc-shaped grooves are opened at equal angles on the rotating ring.

[0009] Preferably, a linear slider is slidably mounted on the linear rail, a guide rod is mounted on the linear slider, and a roller is rotatably mounted at the bottom end of the guide rod, with the roller rolling along an annular groove on the central tube.

[0010] Preferably, a plurality of plate sleeves are installed at equal angles on the outer side of the ring seat, and the inclination angle of the plate sleeves is 30°-45°. A cleaning scraper is elastically installed inside each plate sleeve, and an arc-shaped scraper is installed on the outer side of the cleaning scraper.

[0011] Preferably, the inner top wall of the ring seat is circular and has several balls installed thereon, and the balls are in contact with the outer tooth top side of the outer side of the central tube of the sleeve.

[0012] Preferably, the ring seat has a toothed groove, a motor is installed on the ring seat, and the motor output end is located in the toothed groove with a rotating tooth that meshes with the external tooth.

[0013] Preferably, the rotating ring has a plurality of threaded holes corresponding to the arc-shaped slider, and the threaded holes penetrate the rotating ring and the arc-shaped slider. A limit bolt is installed in the threaded hole, and the end of the limit bolt contacts the arc-shaped rail.

[0014] Preferably, the cleaning scraper has several guide grooves, the plate sleeve has several guide posts installed inside, and the guide posts are slidably installed with the guide grooves. The plate sleeve has several second springs installed inside, and the second springs are connected to the cleaning scraper.

[0015] A method for using an adjustable packer in an oil well, the specific operating steps of which are as follows:

[0016] Step 1: Assemble the auxiliary mechanism with the central tube. Move the auxiliary mechanism along the central tube to the annular groove position. At this time, the rotating teeth and the outer teeth mesh, and the outer teeth contact the ball bearings. Loosen the limit bolts and rotate the rotating ring. The rotating ring rotates along the arc-shaped rail through the arc-shaped slider. At this time, the arc-shaped groove on the rotating ring acts on the guide rod. The guide rod drives the linear slider to move along the linear rail. Adjust the position of the roller until the roller contacts the annular groove. At this time, tighten the limit bolts to complete the installation and fixation of the auxiliary mechanism.

[0017] Step 2: When the packer is placed into the oil well, the cleaning scraper and the plate sleeve are elastically connected by the second spring. The cleaning scraper extends and retracts within the plate sleeve to ensure that the outer end of the cleaning scraper contacts the inner wall of the oil well. After the central tube is lowered into place, the central tube continues to move downward. During the movement, the motor drives the rotating teeth to rotate, which engages with the meshing external teeth. At the same time, through the cooperation of the rollers, the auxiliary mechanism rotates as a whole. As the cleaning scraper rotates continuously, it cleans the inner wall, and the cleaned impurities move downward along the inclined cleaning scraper. When the auxiliary mechanism moves downward, it pushes the impurities downward to ensure that the length of the cleaned well wall matches the length of the rubber sleeve.

[0018] Step 3: During the well run, the sliding pin is at the dead point of the short track of the trajectory groove, and the slips are locked on the central tube to ensure smooth well run. When the packer reaches the designed position, the central tube is lifted, and the sliding pin slides into the dead point of the long track of the trajectory groove. The cone pushes the slips open, so that the slips bite into the outer wall of the central tube to form support. At the same time, the tubing string continues to be lowered, and the seat compresses the rubber sleeve, so that the diameter of the rubber sleeve increases and contacts the inner wall of the oil well, thereby sealing the annular space of the casing and tubing.

[0019] The beneficial effects of this invention are as follows: the auxiliary mechanism is fitted onto the outside of the central tube, the rotating ring is rotated, and the rotating ring rotates along the arc-shaped rail through the arc-shaped slider. At this time, the arc-shaped groove on the rotating ring acts on the guide rod, and the guide rod drives the linear slider to move along the linear rail. The position of the roller is adjusted until the roller contacts the ring groove. At this time, the limiting bolt is tightened to complete the installation and fixation of the auxiliary mechanism, realize the centered installation of the auxiliary mechanism, and facilitate the use of the auxiliary mechanism with central tubes of different outer diameters.

[0020] The motor drives the rotating gear to rotate, which engages with the meshing external gear. Simultaneously, through the rollers, it drives the auxiliary mechanism to rotate as a whole. As the cleaning scraper rotates continuously, it cleans the inner wall, and the cleaned impurities move down along the inclined cleaning scraper. When the auxiliary mechanism moves down, it pushes the impurities downward, cleaning out the well wall area that matches the rubber cartridge, thus preventing impurities on the well wall from affecting and damaging the compressed and expanding rubber cartridge. Attached Figure Description

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

[0022] Figure 2 This is a schematic diagram of the auxiliary mechanism and central tube structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the first structure of the auxiliary mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the second structure of the auxiliary mechanism of the present invention;

[0025] Figure 5 This is a bottom view of the auxiliary mechanism of the present invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged view of a portion of region A in the middle.

[0027] Legend:

[0028] 1. Central tube; 2. Track groove; 3. Ring groove; 4. External tooth; 5. Connector; 6. Adjusting ring; 7. Rubber sleeve; 8. Spacer ring; 9. Sealing seat; 10. Cone; 11. Slip seat; 12. Slip; 13. First spring; 14. Protective cap; 15. Slip ring; 16. Sliding pin; 17. Auxiliary mechanism; 18. Ring seat; 19. Arc rail; 20. Arc slider; 21. Rotary ring; 22. Arc groove; 23. Linear rail; 24. Linear slider; 25. Guide rod; 26. Roller; 27. Plate sleeve; 28. Cleaning scraper; 29. ​​Scraper blade; 30. Ball bearing; 31. Tooth groove; 32. Motor; 33. Rotating tooth; 34. Threaded hole; 35. Limit bolt; 36. Guide groove; 37. Guide post; 38. Second spring. Detailed Implementation

[0029] 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.

[0030] Specific implementation examples are given below.

[0031] See Figures 1-6 An adjustable packer for oil wells includes a central tube 1, a connector 5 installed at the bottom end of the central tube 1, an auxiliary mechanism 17 rotatably installed on the outside of the central tube 1, an adjusting ring 6, several rubber sleeves 7, a setting seat 9, a cone 10 and a slip seat 11 sequentially installed on the outside of the central tube 1, the several rubber sleeves 7 being separated by a spacer ring 8, several slips 12 being rotatably installed on the slip seat 11, one end of the slip 12 engaging with the cone 10, and the other end of the slip 12 being connected to the slip seat 11 by a first spring 13, a protective cap 14 being installed on the slip seat 11, a sliding ring 15 being slidably fitted on the outside of the central tube 1 inside the protective cap 14, several sliding pins 16 being installed on the sliding ring 15, and the sliding pins 16 moving along a track groove 2 opened on the outer wall of the central tube 1.

[0032] The auxiliary mechanism 17 includes a ring seat 18 fitted around the outside of the central tube 1, with the inner diameter of the ring seat 18 matching the outer diameter of the central tube 1. Several arc-shaped rails 19 and straight rails 23 are arranged at equal angles on the bottom side of the ring seat 18, and the arc-shaped rails 19 and straight rails 23 are staggered. Arc-shaped sliders 20 are slidably mounted on the arc-shaped rails 19, and several arc-shaped sliders 20 are connected to a rotating ring 21. Several arc-shaped grooves 22 are formed at equal angles on the rotating ring 21. The cooperation between the arc-shaped sliders 20 and the arc-shaped rails 19 facilitates the rotation of the rotating ring 21 on the ring seat 18. The linear guide 24 is slidably mounted on the linear rail 23, and a guide rod 25 is mounted on the linear rail 24. A roller 26 is rotatably mounted on the bottom end of the guide rod 25, and the roller 26 rolls along the annular groove 3 on the central tube 1. When the rotating ring 21 rotates, the arc groove 22 on the rotating ring 21 acts on the guide rod 25, and the guide rod 25 drives the linear rail 24 to move along the linear rail 23. The position of the roller 26 is adjusted to realize the raising and lowering of the roller 26, which facilitates the assembly and disassembly of the auxiliary mechanism 17 and the central tube 1.

[0033] The rotating ring 21 has several threaded holes 34 corresponding to the arc-shaped slider 20, and the threaded holes 34 pass through the rotating ring 21 and the arc-shaped slider 20. The threaded holes 34 are fitted with limit bolts 35. The end of the limit bolts 35 contacts the arc-shaped rail 19. When the limit bolts 35 are loosened, the arc-shaped slider 20 and the arc-shaped rail 19 are in a sliding connection state. When the limit bolts 35 are tightened, the arc-shaped slider 20 and the arc-shaped rail 19 are in a fixed state, ensuring the fixation of the rotating ring 21, and thus ensuring the installation limit of the auxiliary mechanism 17 and the central tube 1.

[0034] Several plate sleeves 27 are installed at equal angles on the outer side of the ring seat 18, with the inclination angle of the plate sleeves 27 being 30°-45°. The inclined plate sleeves 27 and cleaning scrapers 28 facilitate the movement of impurities along the cleaning scrapers 28 when the cleaning scrapers 28 rotate. Each plate sleeve 27 is elastically installed with a cleaning scraper 28, and an arc-shaped scraper strip 29 is installed on the outer side of the cleaning scraper 28. Several guide grooves 36 are opened inside the cleaning scraper 28. Several guide posts 37 are installed inside the plate sleeve 27, and the guide posts 37 are slidably installed with the guide grooves 36. Several second springs 38 are installed inside the plate sleeve 27, and the second springs 38 are connected to the cleaning scrapers 28. The cleaning scrapers 28 and the plate sleeves 27 are elastically connected through the second springs 38. The cleaning scrapers 28 can be extended and retracted within the plate sleeves 27 to ensure that the outer end of the cleaning scrapers 28 is always in contact with the inner wall of the oil well.

[0035] The ring seat 18 has a toothed groove 31. A motor 32 is installed on the ring seat 18, and the output end of the motor 32 is located in the toothed groove 31 with a rotating tooth 33 installed. The rotating tooth 33 meshes with the external tooth 4. After the auxiliary mechanism 17 is installed, the rotating tooth 33 meshes with the external tooth 4. When the motor 32 works, it drives the rotating tooth 33 to rotate and cooperate with the meshing external tooth 4. At the same time, through the cooperation of the roller 26, it drives the auxiliary mechanism 17 to rotate as a whole. During the continuous rotation of the cleaning scraper 28, the inner wall is cleaned, and the cleaned impurities move down along the inclined cleaning scraper 28. When the auxiliary mechanism 17 moves down, it pushes the impurities downward.

[0036] The inner top wall of the ring seat 18 is circular and has several balls 30 installed. The balls 30 are in contact with the top side of the outer teeth 4 on the outer side of the central tube 1 of the set, so as to realize the rotational connection between the balls 30 and the outer teeth 4, and avoid direct contact between the ring seat 18 and the top side of the outer teeth 4, which would affect the rotation of the ring seat 18.

[0037] A method for using an adjustable packer in an oil well, the specific operating steps of which are as follows:

[0038] Step 1: Assemble the auxiliary mechanism 17 with the central tube 1. Move the auxiliary mechanism 17 along the central tube 1 to the position of the annular groove 3. At this time, the rotating tooth 33 meshes with the external tooth 4, and the external tooth 4 contacts the ball 30. Loosen the limiting bolt 35 and rotate the rotating ring 21. The rotating ring 21 rotates along the arc-shaped rail 19 through the arc-shaped slider 20. At this time, the arc-shaped groove 22 on the rotating ring 21 acts on the guide rod 25. The guide rod 25 drives the linear slider 24 to move along the linear rail 23. Adjust the position of the roller 26 until the roller 26 contacts the annular groove 3. Tighten the limiting bolt 35 to complete the installation and fixation of the auxiliary mechanism 17.

[0039] Step 2: When the packer is placed into the oil well, the cleaning scraper 28 and the sleeve 27 are elastically connected by the second spring 38. The cleaning scraper 28 is extended and retracted within the sleeve 27 to ensure that the outer end of the cleaning scraper 28 contacts the inner wall of the oil well. After the central tube 1 is lowered into place, the central tube 1 continues to move downward. During the movement, the motor 32 drives the rotating gear 33 to rotate, which engages with the meshing external gear 4. At the same time, through the roller 26, the auxiliary mechanism 17 is rotated as a whole. As the cleaning scraper 28 rotates continuously, it cleans the inner wall, and the cleaned impurities move downward along the inclined cleaning scraper 28. When the auxiliary mechanism 17 moves downward, it pushes the impurities downward to ensure that the length of the cleaned well wall matches the length of the rubber sleeve 7.

[0040] Step 3: During the well run, the sliding pin 16 is at the dead point on the short track of the trajectory groove 2, and the slip 12 is locked on the central tube 1 to ensure smooth well run. When the packer reaches the designed position, the central tube 1 is lifted, and the sliding pin 16 slides into the dead point of the long track of the trajectory groove 2. The cone 10 pushes the slip 12 to open, so that the slip 12 bites into the outer wall of the central tube 1 to form support. At the same time, the tubing string continues to be lowered, and the seat 9 compresses the rubber sleeve 7, so that the diameter of the rubber sleeve 7 increases and contacts the inner wall of the oil well, thereby sealing the annular space of the casing.

[0041] The auxiliary mechanism 17 is fitted onto the outside of the central tube 1. The rotating ring 21 is rotated, and the rotating ring 21 rotates along the arc-shaped rail 19 via the arc-shaped slider 20. At this time, the arc-shaped groove 22 on the rotating ring 21 acts on the guide rod 25. The guide rod 25 drives the linear slider 24 to move along the linear rail 23. The position of the roller 26 is adjusted until the roller 26 contacts the ring groove 3. At this time, the limit bolt 35 is tightened to complete the installation and fixation of the auxiliary mechanism 17, realize the centered installation of the auxiliary mechanism 17, and facilitate the use of the auxiliary mechanism 17 with central tubes 1 of different outer diameters.

[0042] The motor 32 drives the rotating gear 33 to rotate, which engages with the meshing external gear 4. Simultaneously, through the roller 26, it drives the auxiliary mechanism 17 to rotate as a whole. As the cleaning scraper 28 rotates continuously, it cleans the inner wall, and the cleaned impurities move down along the inclined cleaning scraper 28. When the auxiliary mechanism 17 moves down, it pushes the impurities downward, cleaning out the well wall area that matches the rubber cylinder 7, thus avoiding the impurities on the well wall from affecting and damaging the compressed and expanding rubber cylinder 7.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adjustable packer for oil production wells, characterized in that, The device includes a central tube (1), a connector (5) installed at the bottom end of the central tube (1), an auxiliary mechanism (17) rotatably installed on the outside of the central tube (1), an adjusting ring (6), several rubber cylinders (7), a seat (9), a cone (10) and a slip seat (11) are installed sequentially on the outside of the central tube (1), several rubber cylinders (7) are separated by a partition ring (8), several slips (12) are rotatably installed on the slip seat (11), one end of the slip (12) is engaged with the cone (10), and the other end of the slip (12) is connected to the slip seat (11) by a first spring (13), a protective cap (14) is installed on the slip seat (11), a sliding ring (15) is installed inside the protective cap (14) and is slidably fitted on the outside of the central tube (1), several sliding pins (16) are installed on the sliding ring (15), and the sliding pins (16) move along the track groove (2) opened on the outer wall of the central tube (1); The auxiliary mechanism (17) includes a ring seat (18) fitted on the outside of the central tube (1), and the inner diameter of the ring seat (18) is adapted to the outer diameter of the central tube (1). Several arc-shaped rails (19) and straight rails (23) are provided at equal angles on the bottom side of the ring seat (18), and the arc-shaped rails (19) and straight rails (23) are arranged alternately. Arc-shaped sliders (20) are slidably installed on the arc-shaped rail (19), and several arc-shaped sliders (20) are connected to the rotating ring (21). Several arc-shaped grooves (22) are opened at equal angles on the rotating ring (21). A linear slider (24) is slidably mounted on the linear rail (23), a guide rod (25) is mounted on the linear slider (24), and a roller (26) is rotatably mounted on the bottom end of the guide rod (25), and the roller (26) rolls along the annular groove (3) on the central tube (1); Several plate sleeves (27) are installed at equal angles on the outer side of the ring seat (18), and the inclination angle of the plate sleeves (27) is 30°-45°. A cleaning scraper (28) is elastically installed inside each plate sleeve (27), and an arc-shaped scraper (29) is installed on the outer side of the cleaning scraper (28).

2. An adjustable packer for oil production wells according to claim 1, characterized in that, The inner top wall of the ring seat (18) is circular and has several balls (30) installed thereon, and the balls (30) are in contact with the top side of the outer teeth (4) on the outside of the central tube (1) of the set.

3. An adjustable packer for oil production wells according to claim 2, characterized in that, The ring seat (18) has a toothed groove (31) inside, and a motor (32) is installed on the ring seat (18). The output end of the motor (32) is located in the toothed groove (31) and a rotating tooth (33) is installed therein. The rotating tooth (33) meshes with the external tooth (4).

4. An adjustable packer for oil production wells according to claim 3, characterized in that, The rotating ring (21) has several threaded holes (34) corresponding to the arc-shaped slider (20), and the threaded holes (34) pass through the rotating ring (21) and the arc-shaped slider (20). The threaded holes (34) are fitted with limit bolts (35) with internal threads, and the end of the limit bolts (35) contacts the arc-shaped rail (19).

5. An adjustable packer for oil production wells according to claim 4, characterized in that, The cleaning scraper (28) has several guide grooves (36) inside, and the plate sleeve (27) is equipped with several guide posts (37), and the guide posts (37) are slidably installed with the guide grooves (36). The plate sleeve (27) is equipped with several second springs (38), and the second springs (38) are connected to the cleaning scraper (28).

6. The method of using an adjustable packer for oil wells according to claim 5, characterized in that, The specific steps for using this method are as follows: Step 1: Assemble the auxiliary mechanism (17) with the central tube (1). Move the auxiliary mechanism (17) along the central tube (1) to the position of the ring groove (3). At this time, the rotating tooth (33) meshes with the external tooth (4), and the external tooth (4) contacts the ball (30). At this time, loosen the limit bolt (35), rotate the rotating ring (21), and the rotating ring (21) rotates along the arc track (19) through the arc slider (20). At this time, the arc groove (22) on the rotating ring (21) acts on the guide rod (25), and the guide rod (25) drives the linear slider (24) to move along the linear track (23). Adjust the position of the roller (26) until the roller (26) contacts the ring groove (3). At this time, tighten the limit bolt (35) to complete the installation and fixation of the auxiliary mechanism (17). Step 2: When the packer is placed into the oil well, the cleaning scraper (28) and the plate sleeve (27) are elastically connected by the second spring (38). The cleaning scraper (28) is extended and retracted within the plate sleeve (27) to ensure that the outer end of the cleaning scraper (28) contacts the inner wall of the oil well. When the central tube (1) is lowered into the well, the central tube (1) continues to move downward. During the movement, the motor (32) drives the rotating teeth (33) to rotate and engage with the meshing external teeth (4). At the same time, through the roller (26), the auxiliary mechanism (17) is driven to rotate as a whole. During the continuous rotation of the cleaning scraper (28), the inner wall is cleaned, and the cleaned impurities move down along the inclined cleaning scraper (28). When the auxiliary mechanism (17) moves down, it pushes the impurities downward to ensure that the length of the cleaned well wall matches the length of the rubber sleeve (7). Step 3: During the well run, the sliding pin (16) is at the dead point on the short track of the trajectory groove (2), and the slip (12) is locked on the central tube (1) to ensure smooth well run. When the packer is lowered to the designed position, the central tube (1) is lifted, and the sliding pin (16) slides into the dead point of the long track of the trajectory groove (2). The cone (10) pushes the slip (12) to open, so that the slip (12) bites into the outer wall of the central tube (1) to form support. At the same time, the tubing string is lowered, and the seat (9) compresses the rubber sleeve (7) so that the diameter of the rubber sleeve (7) increases and contacts the inner wall of the well, thereby sealing the annular space of the casing.

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