An oil production device

Abstract

This invention discloses an oil extraction device, including a packer. The packer includes a central cylinder with a first end and a second end. A first sleeve is fitted over the central cylinder. An annular piston is installed in the cavity formed between the first sleeve and the central cylinder, dividing the cavity into a first chamber and a second chamber. A second sleeve is installed in the second chamber. A rubber sleeve is fitted over the central cylinder. A water inlet hole communicating with the first chamber is provided on the side wall of the central cylinder. A third sleeve is installed outside the first sleeve. The third sleeve has a driving member that extends through the first sleeve into the first chamber. A third elastic member is installed between the driving member and the end of the first chamber facing the first end. The third elastic member pushes the third sleeve to move towards the second end. During depressurization, the third sleeve can move towards the rubber sleeve and squeeze the rubber sleeve, thereby increasing the pressure of the rubber sleeve on the first abutment member, accelerating the retraction of the second sleeve, thereby accelerating the discharge of water from the first chamber and accelerating the unsealing speed of the packer.

Description

Technical Field

[0001] This invention belongs to the field of oil production equipment technology, and particularly relates to an oil production device. Background Technology

[0002] In oil extraction, it is often necessary to perform layered fracturing of the drilled formation. After fracturing, packers are used to isolate the reservoir. Existing packers typically use hydrodynamic pressure to push the contact element to compress the rubber sleeve, causing the sleeve to expand and thus setting the packer. However, when unsealing is required, the rubber sleeve needs to recover its elasticity to expel the fluid. The recovery speed of the rubber sleeve is affected by the fluid depressurization rate; a slower depressurization rate will result in a slower unsealing speed of the packer, thereby affecting oil production efficiency. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned technical problems by providing a method for rapidly unsealing oil extraction devices.

[0004] The objective of this invention is achieved as follows: An oil production device includes a casing, an oil pipe disposed within the casing, and an annular cavity formed between the casing and the oil pipe. A packer is disposed within the annular cavity, and the packer includes a central cylinder. The central cylinder has a first end and a second end, the first end having a first connector and the second end having a second connector. A first sleeve is fitted over the central cylinder, and a cavity is formed between the first sleeve and the central cylinder. An annular piston is disposed within the cavity, dividing the cavity into a first chamber near the first end and a second chamber near the second end. A second sleeve fitted over the central cylinder is disposed within the second chamber. The second sleeve is movable along the central cylinder. A rubber tube is provided outside the central cylinder. A water inlet hole communicating with the first chamber is provided on the side wall of the central cylinder. Water pressure pushes the annular piston to move toward the second end. The annular piston drives the second sleeve to move. The second sleeve squeezes the rubber tube, causing the rubber tube to expand. A third sleeve is provided outside the first sleeve. The first sleeve is provided with an opening communicating with the first chamber. The third sleeve is provided with a driving member that extends into the first chamber through the opening. A third elastic member is provided between the driving member and the end of the first chamber facing the first end. The third elastic member pushes the third sleeve to move toward the second end.

[0005] Furthermore, in this invention, a connecting ring is provided on the side of the annular piston facing the second end, and a movable connecting member is provided on the connecting ring. A connecting groove is provided on the second sleeve for the connecting member to be inserted to fix the connecting ring to the second sleeve. A first magnet is provided on the side of the first sleeve facing the second sleeve, and a second magnet is provided on the connecting member facing the first magnet. When the annular piston drives the connecting ring to move so that the positions of the first magnet and the second magnet are aligned, the second magnet is attracted by the first magnet and disengages from the connecting groove, thereby separating the second sleeve from the connecting ring.

[0006] Furthermore, in this invention, the second sleeve includes a first segment and a second segment, the diameter of the first segment being smaller than the diameter of the second segment, the first segment and the second segment being connected by a connecting plate, the first segment being placed between the connecting ring and the central cylinder, the connecting groove being placed on the first segment, the annular piston being provided with a through hole communicating between the first chamber and the second chamber and a cover plate covering the through hole, the first sleeve including a ring body and a connecting body, the connecting body being fixed to the central cylinder, a first elastic element being provided between the connecting body and the connecting plate, when the second sleeve separates from the connecting ring, the elastic element pushes the second sleeve to open the cover plate to release pressure in the first chamber.

[0007] Furthermore, in this invention, the connecting ring is provided with a movable hole, the connecting member includes a connecting segment passing through the movable hole and a head that engages with the movable hole, the head is provided with an embedding groove, the second magnet is placed in the embedding groove, the connecting segment is provided with a first baffle, the movable hole is provided with a second baffle, and a second elastic member is provided between the first baffle and the second baffle, the second elastic member pushes the connecting segment into the connecting groove.

[0008] Furthermore, in this invention, the annular piston is provided with a trigger hole, and the cover plate covers both the trigger hole and the through hole. The cover plate is provided with a trigger element extending toward the trigger hole, and the first section facing the annular piston is provided with a trigger part. The trigger part is inserted into the trigger hole to lift the cover plate so that the through hole is opened.

[0009] Furthermore, in this invention, the trigger hole includes a first hole segment and a second hole segment arranged sequentially from the first end to the second end. The diameter of the second hole segment is larger than the diameter of the first hole segment. A limiting plate is provided on the part of the trigger member placed in the second hole segment, and the limiting plate is locked at the connection between the limiting plate and the first hole segment and the second hole segment.

[0010] Furthermore, in this invention, the trigger hole further includes a third hole segment extending from the second hole segment toward the connecting ring, the diameter of the third hole segment gradually increasing from the second hole segment toward the connecting ring, and the diameter of the second hole segment being larger than the diameter of the trigger portion.

[0011] Furthermore, in this invention, the connector is provided with an extension channel, the second segment extends through the extension channel to the end of the rubber tube facing the first end, the second segment is provided with a first abutting member that contacts the rubber tube, and the central tube is provided with a second abutting member that abuts against the end of the rubber tube facing the second end.

[0012] Furthermore, in this invention, the third sleeve includes a sealing section and a pressure relief section, the thickness of the pressure relief section being less than the thickness of the sealing section so that a pressure relief channel is formed between the third sleeve and the second sleeve, and a pressure relief hole is provided at the connection between the ring body and the connecting body.

[0013] The beneficial effects of this invention are:

[0014] 1. When the pressure is released, the third sleeve can move toward the rubber tube and squeeze the rubber tube, thereby increasing the pressure of the rubber tube on the first abutment, accelerating the retraction of the second sleeve, thereby accelerating the discharge of water from the first chamber and accelerating the unsealing speed of the packer.

[0015] 2. The cooperation of the first magnet and the second magnet enables the connecting ring and the second sleeve to separate from the annular piston, allowing the first sleeve to open the through hole on the annular piston for pressure relief. At the same time, the first elastic element can further push the arc-shaped piston to move through the second sleeve, further accelerating the discharge of water from the first chamber, thereby speeding up the unsealing process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the packer structure;

[0018] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0020] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0021] Figure 6 yes Figure 4 Enlarged view at point D;

[0022] Figure 7 yes Figure 4 Enlarged view at point E in the middle;

[0023] The attached figures are labeled as follows: 100, sleeve; 110, oil pipe; 120, telescopic rod; 200, packer; 210, central cylinder; 211, first end; 212, second end; 213, first connector; 214, second connector; 215, water inlet; 216, first chamber; 217, second chamber; 300, rubber sleeve; 310, first abutment; 320, second abutment; 400, first sleeve; 401, first magnet; 410, ring; 411, opening; 412, pressure relief hole; 420, connector; 421, extension channel; 500, second sleeve; 510, first section; 511, trigger part; 512, connecting groove; 520, connecting... 530, Second section; 540, First elastic element; 600, Third sleeve; 601, Pressure relief channel; 602, Sealing section; 603, Pressure relief section; 610, Driving element; 620, Third elastic element; 700, Annular piston; 701, Through hole; 702, Cover plate; 703, Trigger element; 704, Limiting plate; 710, Connecting ring; 720, Movable hole; 721, Second baffle; 730, Connecting element; 731, Connecting section; 732, Head; 733, Embedded groove; 734, Second magnet; 735, First baffle; 740, Second elastic element; 750, Trigger hole; 751, First hole section; 725, Second hole section; 753, Third hole section. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0025] See Figures 1 to 7An oil production device includes a casing 100, within which an oil pipe 110 is installed. A telescopic rod 120, movable axially along the oil pipe 110, is installed within the casing. The telescopic rod 120 is driven by an external power source to move, thereby producing oil. An annular cavity is formed between the casing 100 and the oil pipe 110, and a packer 200 is installed within the annular cavity. The packer 200 includes a central cylinder 210, comprising a first end 211 and a second end 212. The first end 211 has a first connector 213, and the second end 212 has a second connector 214. The device is connected to the oil pipe 110 via the first connector 213 and the second connector 214. A first sleeve 400 is provided outside the central cylinder 210, forming a cavity between the first sleeve 400 and the central cylinder 210. An annular piston 700 is provided inside the cavity, dividing the cavity into a first chamber 216 near the first end 211 and a second chamber 217 near the second end 212. A second sleeve 500 is provided inside the second chamber 217, which is sleeved outside the central cylinder 210 and can move along the central cylinder 210. A rubber sleeve 300 is provided outside the central cylinder. A water inlet 215 communicating with the cavity is provided on the side wall of the central cylinder 210. Water is injected into the central cylinder 210 to increase the water pressure in the cavity. The water pressure pushes the annular piston 700 to move in the direction of the second end 212. The annular piston 700 drives the second sleeve 500 to move, and the second sleeve 500 squeezes the rubber sleeve 300 to expand, thereby setting the packer 200.

[0026] A connecting ring 710 is provided on the side of the annular piston 700 facing the second end 212. The connecting ring 710 is provided with a movable hole 720, and a connecting member 730 that can move axially along the movable hole 720 is provided inside the movable hole 720. The connecting member 730 includes a connecting section 731 that passes through the movable hole 720 and a head 732 that engages with the movable hole 720. The head 732 faces the first sleeve 400. The connecting section 731 is provided with a first baffle 735, and the movable hole 720 is provided with a second baffle 721. A second elastic member 740 is provided between the first baffle 735 and the second baffle 721. The second sleeve 500 is provided with a connecting groove 512 for the connecting member 730 to be inserted so that the connecting ring 710 is fixed to the second sleeve 500. The second elastic member 740 pushes the connecting section 731 into the connecting groove 512 so that the connecting ring 710 and the second sleeve 500 are kept connected. Thus, the movement of the annular piston 700 can drive the movement of the second sleeve 500, thereby changing the pressure of the second sleeve 500 on the rubber sleeve 300. A first magnet 401 is provided on the side of the first sleeve 400 facing the connecting ring 710. An embedding groove 733 is provided in the head 732, and a second magnet 734, capable of attracting the first magnet 401, is provided in the embedding groove 733. A connecting groove 512 is provided on the second sleeve 500 for the insertion of the connecting member 730 to fix the connecting ring 710 to the second sleeve 500. When the annular piston 700 pushes the connecting ring 710 to the position of the first magnet 401, the second magnet 734 is attracted by the first magnet 401 and disengages from the connecting groove 512, thereby separating the connecting ring 710 from the second sleeve 500.

[0027] The second sleeve 500 includes a first section 510 and a second section 530. The diameter of the first section 510 is smaller than the diameter of the second section 530. The first section 510 and the second section 530 are connected by a connecting plate 520. The first section 510 is placed between the connecting ring 710 and the central cylinder 210. The connecting groove 512 is placed on the first section 510. The annular piston 700 is provided with a through hole 701 connecting the first chamber 216 and the second chamber 217 and a cover plate 702 covering the through hole 701. The first sleeve 400 includes a ring body 410 and a connecting body 420. The connecting body 420 is fixed to the central cylinder 210. A first elastic element 540 is provided between the connecting body 420 and the connecting plate 520. The first elastic element 540 is a spring. When the second sleeve 500 is separated from the connecting ring 710, the first elastic element 540 pushes the second sleeve 500 to open the cover plate 702 so that the first chamber 216 is depressurized. Specifically, a trigger hole 750 is provided in the annular piston 700, and a cover plate 702 covers both the trigger hole 750 and the through hole 701. The cover plate 702 is provided with a trigger element 703 extending into the trigger hole 750, and a trigger part 511 is provided at one end of the first section 510 facing the annular piston 700. When the connecting ring 710 separates from the second sleeve 500, the first elastic element 540 pushes the second sleeve 500 to move towards the first end 211, thereby causing the trigger part 511 to insert into the trigger hole 750 and push the trigger element 703 and the cover plate 702 together, thereby opening the through hole 701 and connecting the first chamber 216 and the second chamber 217 to each other, thereby depressurizing the first chamber 216.

[0028] The trigger hole 750 includes a first hole segment 751 and a second hole segment 725 arranged sequentially from the first end 211 to the second end 212. The diameter of the second hole segment 725 is larger than the diameter of the first hole segment 751. A limiting plate 704 is provided on the part of the trigger member 703 that is placed in the second hole segment 725. The limiting plate 704 is locked at the connection between the first hole segment 751 and the second hole segment 725, thereby preventing the trigger member 703 from being completely pushed out of the trigger hole 750, so that the trigger member 703 and the cover plate 702 can be reset. The trigger hole 750 also includes a third hole segment 753 extending from the second hole segment 725 toward the connecting ring 710. The diameter of the third hole segment 753 gradually increases from the second hole segment 725 toward the connecting ring 710. The diameter of the second hole segment 725 is larger than the diameter of the trigger part 511, so that the third hole segment 753 is a trumpet-shaped structure with the opening 411 facing the trigger part 511. This can guide the trigger part 511 into the trigger hole 750 and prevent the trigger hole 750 from shifting, causing the through hole 701 to fail to open.

[0029] The connecting body 420 is provided with an extension channel 421. The second segment 530 extends through the extension channel 421 to the end of the rubber tube 300 facing the first end 211. The second segment 530 is provided with a first abutting member 310 that contacts the rubber tube 300. The central cylinder 210 is provided with a second abutting member 320 that abuts against the end of the rubber tube 300 facing the second end 212. When the second sleeve 500 moves, the first abutting member 310 moves with the second sleeve 500 to apply pressure to the rubber tube 300.

[0030] A third sleeve 600 is provided outside the first sleeve 400. The first sleeve 400 has an opening 411 communicating with the first chamber 216. The third sleeve 600 has a driving member 610 extending into the first chamber 216 through the opening 411. A third elastic member 620 is provided between the driving member 610 and the end of the first chamber 216 facing the first end 211. The third elastic member 620 pushes the third sleeve 600 to move towards the second end 212. When pressure is applied inside the first chamber 216, the driving member 610 is squeezed and moves towards the first end 211, which also drives the third sleeve 600 to move towards the first end 211, thereby moving the third sleeve 600 away from the rubber tube 300. When the first chamber 216 is depressurized, the third elastic element 620 pushes the third sleeve 600 toward the rubber tube 300. Since the rubber tube 300 has expanded at this time, the end of the third sleeve 600 toward the rubber tube 300 will squeeze the expanded rubber tube 300, thereby accelerating the recovery of the rubber tube 300 and thus accelerating the unsealing speed of the packer 200.

[0031] The third sleeve 600 includes a sealing section 602 and a pressure relief section 603. The thickness of the pressure relief section 603 is less than the thickness of the sealing section 602 so that a pressure relief channel 601 is formed between the third sleeve 600 and the second sleeve 500. A pressure relief hole 412 is provided at the connection between the ring body 410 and the connecting body 420. When the first chamber 216 is depressurized, the water in the first chamber 216 flows into the second chamber 217 through the through hole 701, and then flows into the pressure relief channel 601 through the pressure relief hole 412 before being discharged.

[0032] When the packer 200 needs to be set, water is injected into the central cylinder 210. The water flows into the first chamber 216 through the inlet hole 215, increasing the pressure in the first chamber 216. The water pressure pushes the annular piston 700 towards the direction of the second end 212. The movement of the annular piston 700 drives the second sleeve 500 to move, thereby moving the first abutment 310 and squeezing the rubber tube 300, causing the rubber tube 300 to expand and the packer 200 to be set. At the same time, the water pressure also pushes the drive member 610 towards the direction of the first end 211, thereby moving the third sleeve 600 away from the rubber tube 300, thus preventing obstruction of the expansion of the rubber tube 300.

[0033] When unsealing, the water injection pressure is increased to raise the pressure in the first chamber 216, causing the annular piston 700 to drive the connecting ring 710 to continue moving. When the second magnet 734 on the connecting ring 710 corresponds to the first magnet 401 on the first sleeve 400, the second magnet 734 disengages from the connecting groove 512, causing the connecting ring 710 to separate from the second sleeve 500. Under the push of the first elastic member 540, the second sleeve 500 pushes open the cover plate 702, opening the through hole 701, thereby connecting the first chamber 216 and the second chamber 217. The water in the first chamber 216 enters the second chamber 217 through the through hole 701 and then flows into the pressure relief channel 601 through the pressure relief hole 412 before being discharged, thereby relieving the pressure in the first chamber 216. At this time, the second sleeve 500 abuts against the annular piston 700 and pushes the annular piston 700 to move in the direction of the first end 211, reducing the pressure of the first abutting member 310 on the rubber sleeve 300. The sleeve begins to recover under its own elasticity. Simultaneously, due to the depressurization of the first chamber 216, the third elastic element 620 pushes the driving element 610 to move in the direction of the second end 212, causing the third sleeve 600 to contact the rubber tube 300 and squeeze the rubber tube 300, accelerating the recovery of the rubber tube 300, thereby speeding up the unsealing speed.

[0034] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An oil extraction device, characterized in that, The device includes a casing (100) and an oil pipe (110) inside the casing (100). An annular cavity is formed between the casing (100) and the oil pipe (110). The oil pipe (110) is connected to a packer (200) capable of sealing the annular cavity. The packer (200) includes a central cylinder (210), which includes a first end (211) and a second end (212). A first sleeve (400) is fitted over the central cylinder (210). A cavity is formed between the first sleeve (400) and the central cylinder (210). An annular piston (700) is provided inside the cavity. The annular piston (700) divides the cavity into a first chamber (216) near the first end (211) and a second chamber (217) near the second end (212). A sleeve fitted over the central cylinder (211) is provided inside the second chamber (217). A second sleeve (500) is provided outside the first sleeve (400). The second sleeve (500) is movable along the central cylinder (210). A rubber sleeve (300) is provided on the outside of the central cylinder. A water inlet (215) communicating with the first chamber (216) is provided on the side wall of the central cylinder (210). A third sleeve (600) is provided outside the first sleeve (400). The first sleeve (400) is provided with an opening (411) communicating with the first chamber (216). The third sleeve (600) is provided with a driving member (610) that extends into the first chamber (216) through the opening (411). A third elastic member (620) is provided between the driving member (610) and the end of the first chamber (216) facing the first end (211). The third elastic member (620) pushes the third sleeve (600) to move towards the second end (212). The annular piston (700) has a connecting ring (710) on the side facing the second end (212). The connecting ring (710) has a movable connector (730). The second sleeve (500) has a connecting groove (512) for the connector (730) to be inserted into so that the connecting ring (710) is fixed to the second sleeve (500). The first sleeve (400) has a first magnet (401) on the side facing the second sleeve (500). The connector (730) has a second magnet (734) facing the first magnet (401). When the annular piston (700) drives the connecting ring (710) to move so that the first magnet (401) and the second magnet (734) are aligned, the second magnet (734) is attracted by the first magnet (401) and disengages from the connecting groove (512), thus separating the second sleeve (500) from the connecting ring (710). The second sleeve (500) includes a first section (510) and a second section (530). The diameter of the first section (510) is smaller than the diameter of the second section (530). The first section (510) and the second section (530) are connected by a connecting plate (520). The first section (510) is placed between the connecting ring (710) and the central cylinder (210). The connecting groove (512) is placed on the first section (510). The annular piston (700) is provided with a connection between the first chamber (216) and the second chamber (217). The first sleeve (400) includes a through hole (701) and a cover plate (702) covering the through hole (701). The first sleeve (400) includes a ring (410) and a connecting body (420). The connecting body (420) is fixed to the central cylinder (210). A first elastic element (540) is provided between the connecting body (420) and the connecting plate (520). When the second sleeve (500) is separated from the connecting ring (710), the elastic element pushes the second sleeve (500) to open the cover plate (702) so that the first chamber (216) is depressurized.

2. The oil extraction device according to claim 1, characterized in that, The connecting ring (710) is provided with a movable hole (720). The connector (730) includes a connecting section (731) passing through the movable hole (720) and a head (732) that engages with the movable hole (720). The head (732) is provided with an embedding groove (733). The second magnet (734) is placed in the embedding groove (733). The connecting section (731) is provided with a first baffle (735). The movable hole (720) is provided with a second baffle (721). A second elastic member (740) is provided between the first baffle (735) and the second baffle (721). The second elastic member (740) pushes the connecting section (731) into the connecting groove (512).

3. An oil extraction device according to claim 1, characterized in that, The annular piston (700) is provided with a trigger hole (750), and the cover plate (702) covers both the trigger hole (750) and the through hole (701). The cover plate (702) is provided with a trigger element (703) extending toward the trigger hole (750). The first segment (510) is provided with a trigger part (511) at one end toward the annular piston (700). The trigger part (511) is inserted into the trigger hole (750) to lift the cover plate (702) so that the through hole (701) is opened.

4. An oil extraction device according to claim 3, characterized in that, The trigger hole (750) includes a first hole segment (751) and a second hole segment (725) arranged sequentially from the first end (211) to the second end (212). The diameter of the second hole segment (725) is larger than the diameter of the first hole segment (751). A limiting plate (704) is provided on the part of the trigger member (703) placed in the second hole segment (725). The limiting plate (704) is locked at the connection between the first hole segment (751) and the second hole segment (725).

5. An oil extraction device according to claim 4, characterized in that, The trigger hole (750) further includes a third hole segment (753) extending from the second hole segment (725) toward the connecting ring (710). The diameter of the third hole segment (753) gradually increases from the second hole segment (725) toward the connecting ring (710), and the diameter of the second hole segment (725) is larger than the diameter of the trigger part (511).

6. An oil extraction device according to claim 1, characterized in that, The connector (420) is provided with an extension channel (421), the second segment (530) extends through the extension channel (421) to the end of the rubber tube (300) facing the first end (211), the second segment (530) is provided with a first abutting member (310) that contacts the rubber tube (300), and the central tube (210) is provided with a second abutting member (320) that abuts against the end of the rubber tube (300) facing the second end (212).

7. An oil extraction device according to claim 1, characterized in that, The third sleeve (600) includes a sealing section (602) and a pressure relief section (603). The thickness of the pressure relief section (603) is less than the thickness of the sealing section (602) so that a pressure relief channel (601) is formed between the third sleeve (600) and the second sleeve (500). A pressure relief hole (412) is provided at the connection between the ring body (410) and the connecting body (420).

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