Compression type packer capable of being repeatedly set

Abstract

The invention discloses a compression type packer capable of being repeatedly set, and belongs to the technical field of oil production engineering equipment. A rubber barrel shaft is arranged on the outer circumference of a center pipe, a rubber barrel is arranged on the outer circumference of the rubber barrel shaft, a first sealing ring is arranged at one end of an upper pressing ring, an upper connector is arranged at the other end of the first sealing ring, a cylinder sleeve is arranged at the other end of the rubber barrel shaft, and an anti-resistance nail is arranged on the cylinder sleeve; and a plurality of setting valve core mechanisms and unsetting valve core mechanisms are arranged on the outer circumference of the second sealing ring on the outer circumference of the central pipe. The setting compression type packer is pressed to extrude the first medium container in the packer, hydraulic oil in the first medium container flows into the second medium container through the upper one-way constant-pressure valve element, the hydraulic oil in the second medium container is increased, the pressure is increased, and the internal hydraulic pressure is reduced by increasing the size of the second medium container; the second medium container extrudes the rubber barrel through the central pipe, the rubber barrel expands, the outer diameter is increased, a pipeline is packed, setting and unsetting of the compression type packer are achieved, and the actual production requirement is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil production engineering equipment, and particularly relates to a reusable setting compression packer. Background Art

[0002] Oil is a fluid mineral buried deep underground. Initially, people called the oily liquid minerals produced in nature petroleum, the combustible gas natural gas, and the solid combustible oil-based minerals asphalt. With the in-depth study of minerals, it was recognized that they all belong to hydrocarbon compounds in composition and are interrelated in origin. Therefore, they are collectively called petroleum. Petroleum plays an important role in the national economy. Compared with coal, it has the advantages of high energy density, convenient transportation and storage, and less pollution after combustion. The fuel oil refined from petroleum is the main fuel for transportation tools, power station boilers, metallurgical industries, and various kilns in the building materials industry. The liquefied gas and pipeline gas made from petroleum are high-quality fuels for urban residents' living applications. Aircraft, tanks, and other spacecraft also consume a large amount of petroleum fuel. Therefore, many countries list petroleum as a strategic material. Oil extraction refers to the act of excavating and extracting oil in places where oil is stored. During the process of oil extraction, the driving method of oil and gas flowing from the reservoir into the bottom of the well and then rising from the bottom of the well to the wellhead is adopted. And the essential tool for exploitation and use is the packer, which refers to a downhole tool connected to the downhole string and used to seal the annular space between the tubing and the casing of the oil and gas well or the open-hole wellbore wall.

[0003] The setting compression packer is a tool and equipment used in pipelines or wellbores, and is a device for creating a temporary seal or isolation. This device is usually used in fields such as oil and gas drilling, underground water resource development, and geological exploration. The design and functions of the setting compression packer include the following aspects: Sealing function: The setting compression packer is designed to create a temporary closed area in the pipeline or wellbore for pipeline repair, downhole operations, testing, or isolating different strata.

[0004] At present, the mechanical setting packer oil production technology that is widely used in the field and has relatively mature technology can be roughly divided into two categories according to the type of string: the integral production string and the releasing production string composed of downhole tools such as Y111 packers and Y211 or Y221 packers. Among them, the integral production string is welcomed by on-site users due to its simple structure, convenient construction operation, and low cost. However, it has the following disadvantages: On the one hand, the phenomenon of setting the packer midway is common, and the rubber cylinder is damaged to a certain extent; on the other hand, when the Y111 packer and the Y221 or Y221 packer are used together for downhole layered packer completion oil production, when the Y111 packer and the Y221 or Y221 packer are combined, it is difficult to achieve that when setting is required, the Y111 packer sets after the Y221 or Y221 packer, and when releasing is required, it releases before the Y221 or Y221 packer. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a repeatable setting compression packer with low failure rate, easy operation and high working efficiency.

[0006] The technical solution adopted to solve the above technical problem is: a rubber barrel shaft is arranged on the outer circumference of the central tube, a rubber barrel is arranged on the outer circumference of the rubber barrel shaft, a sealing outer sleeve is arranged at one end of the rubber barrel shaft, an upper pressing ring connected to one end of the rubber barrel is arranged on the outer circumference of the sealing outer sleeve, a first sealing ring is arranged at one end of the upper pressing ring, a sealing core shaft located inside the upper pressing ring is arranged at one end of the first sealing ring, an upper joint is arranged at the other end of the first sealing ring, a cylinder sleeve connected to the other end of the rubber barrel is arranged at the other end of the rubber barrel shaft, anti-resistance nails are arranged on the cylinder sleeve, a second sealing ring is arranged on the outer circumference of the central tube, a plurality of setting valve core mechanisms and releasing valve core mechanisms are arranged on the outer circumference of the second sealing ring, and a lower joint is arranged at one end of the cylinder sleeve; the structures of the setting valve core mechanism and the releasing valve core mechanism are the same. The setting valve core mechanism includes a first medium container, a second medium container and a valve core. The first medium container and the second medium container are arranged on the outer circumference of the second sealing ring. Cavities for storing hydraulic oil are respectively arranged inside the first medium container and the second medium container. A plurality of valve cores are arranged between the first medium container and the second medium container, and the plurality of valve cores are symmetrically located on the outer circumference of the second sealing ring respectively.

[0007] Further, the horizontal center line of the first medium container, the horizontal center line of the second medium container and the horizontal center line of the valve core are the same straight line.

[0008] Further, the end face of the first medium container is parallel to the end face of the second medium container.

[0009] Further, the horizontal center line of the first medium container, the horizontal center line of the second medium container, the horizontal center line of the valve core and the horizontal center line of the central tube are parallel to each other.

[0010] Further, the valve core of the setting valve core mechanism is an upper one-way valve core, and the valve core of the releasing valve core mechanism is a lower one-way valve core. The upper one-way valve core and the lower one-way valve core are evenly arranged on the outer circumference of the second sealing ring. There are holes on the upper one-way valve core and the lower one-way valve core respectively. The first medium container is communicated with the second medium container through the upper one-way valve core, and the second medium container is communicated with the first medium container through the lower one-way valve core.

[0011] Further, the hole diameter of the upper one-way valve core is smaller than the hole diameter of the lower one-way valve core.

[0012] Further, the upper one-way valve core is an upper one-way constant-pressure valve core, and the lower one-way valve core is a lower one-way constant-pressure valve core. Springs are respectively arranged inside the upper one-way constant-pressure valve core and the lower one-way constant-pressure valve core, and the spring force of the springs is 4 - 6 Mpa.

[0013] Further, the formula for the hole diameter of the upper one-way valve core is: R = K(V1 - V1 ′ ), the hole diameter of the upper one-way valve core is R, the volume of the first medium container is V1, and the volume of the first medium container after setting is V1 ′ , where K is the valve core coefficient.

[0014] Further, the anti-resistance nail includes a housing and an inner core. The inner core is arranged inside the housing, and one end of the inner core is located outside the housing.

[0015] Further, the material of the housing is copper, and the inner core is a soluble material inner core. The material of the soluble material inner core includes magnesium-based alloy and aluminum-based alloy.

[0016] The beneficial effects of the present invention are as follows: (1) The present invention adopts the upper joint connecting the central pipe of the press-in packer, so that the packer is extruded. The press-in compression packer is pressured to extrude the first medium container inside the packer. The hydraulic oil in the first medium container flows into the second medium container through the upper one-way constant-pressure valve core. The hydraulic oil in the second medium container increases, and the pressure becomes larger. The second medium container reduces the internal hydraulic pressure by increasing the volume. The second medium container extrudes the rubber cylinder through the central pipe, and the rubber cylinder expands, and the outer diameter becomes larger, so as to seal the pipeline. When releasing the seal, the hydraulic oil in the second medium container flows into the first medium container through the lower one-way valve core, realizing the setting and releasing of the compression packer, and meeting the actual production needs. The present invention has the advantages of being easy to operate and having high working efficiency.

[0017] (2) The present invention adopts a hydraulic shear of the anti-resistance nail with a relatively small pressure, so that the packer can be set quickly, reducing the setting pressure and facilitating the use of the packer.

[0018] (3) The present invention adopts a second sealing ring arranged on the outer circumference of the central pipe. The second sealing ring can make the contact area with the first medium container and the second medium container receive uniform force, prevent the second medium container from moving up and down along the axial direction of the central pipe beyond the maximum deformation range of the rubber cylinder, causing damage to the rubber cylinder and affecting the subsequent repeated use of the packer, and prevent the compression packer from shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The attached drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1It is a schematic structural diagram of an embodiment of the repeatable setting and compressible packer of the present invention.

[0021] Figure 2 It is a schematic structural diagram of a shear pin.

[0022] Figure 3 It is a schematic structural diagram of a hydraulic mechanism.

[0023] Reference numerals: 1, upper sub; 2, first sealing ring; 3, upper pressure ring; 4, sealing mandrel; 5, sealing outer sleeve; 6, rubber cylinder; 7, rubber cylinder shaft; 8, resistance nail; 9, cylinder sleeve; 10, setting spool mechanism; 11, second sealing ring; 12, lower sub; 13, releasing spool mechanism; 14, central tube; 801, outer shell; 802, inner core; 1001, first medium container; 1002, second medium container; 1003, spool. Detailed Description of the Invention

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] As Figure 1As shown in the figure, the repeatable setting and compression packer of this embodiment includes an upper sub 1, a first sealing ring 2, an upper pressing ring 3, a sealing mandrel 4, a sealing outer sleeve 5, a rubber barrel 6, a rubber barrel shaft 7, a resistance nail 8, a cylinder sleeve 9, a setting valve core mechanism 10, a second sealing ring 11, a lower sub 12, a releasing valve core mechanism 13, and a central tube 14. A rubber barrel shaft 7 is arranged on the outer circumference of the central tube 14, a rubber barrel 6 is arranged on the outer circumference of the rubber barrel shaft 7, one end of the rubber barrel shaft 7 is provided with a sealing outer sleeve 5, an upper pressing ring 3 connected to one end of the rubber barrel 6 is arranged on the outer circumference of the sealing outer sleeve 5, a first sealing ring 2 is arranged at one end of the upper pressing ring 3, a sealing mandrel 4 located inside the upper pressing ring 3 is arranged at the other end of the first sealing ring 2, an upper sub 1 is arranged at the other end of the first sealing ring 2, a cylinder sleeve 9 connected to the other end of the rubber barrel 6 is arranged at the other end of the rubber barrel shaft 7, a resistance nail 8 is arranged on the cylinder sleeve 9, a second sealing ring 11 is arranged on the outer circumference of the central tube 14. The second sealing ring 11 can make the area in contact with the first medium container 1001 and the second medium container 1002 be evenly stressed, prevent the second medium container 1002 from moving axially up and down along the central tube 14 by a distance exceeding the maximum deformation range of the rubber barrel 6, causing damage to the rubber barrel 6 and affecting the subsequent repeated use of the packer, and prevent the compression packer from shifting. A plurality of setting valve core mechanisms 10 and releasing valve core mechanisms 13 are arranged on the outer circumference of the second sealing ring 11, and a lower sub 12 is arranged at one end of the cylinder sleeve 9.

[0027] As Figure 2 shown, the resistance nail 8 includes a housing 801 and an inner core 802. The inner core 802 is arranged inside the housing 801, and one end of the inner core 802 is located outside the housing 801. The material of the housing 801 is copper, and the inner core 802 is a soluble material inner core. The soluble material inner core material includes magnesium-based alloy and aluminum-based alloy, which can prevent the packer from being set in advance. The frictional force of the wellbore on the packer finally acts on the resistance nail 8 instead of on the setting valve core mechanism 10, effectively preventing the packer from being set in advance during the running-in process and improving the operability of the packer when it is difficult to run in. Before the packer is set, the resistance nail 8 can withstand a large pressure and smoothly enter the designated position. At the same time, when the packer is placed in the well, since at least one end face of the inner core 802 of the soluble material inner core is exposed outside the housing 801, the end face can contact the well fluid, and the soluble material inner core will be corroded into powder under the action of factors such as well fluid and temperature in the well. As the packer is gradually lowered, the soluble material inner core gradually dissolves. When it reaches the designated position or after a certain period of time, the soluble material inner core is completely dissolved, and only the housing 801 structure of the resistance nail 8 remains. By shearing the resistance nail 8 with a hydraulic pressure of a relatively small pressure, the packer can be quickly set, reducing the setting pressure and facilitating the use of the packer.

[0028] As Figure 3As shown, the setting pack-off spool mechanism 10 includes a first medium container 1001, a second medium container 1002, and a spool 1003. The first medium container 1001 and the second medium container 1002 are arranged on the outer circumference of the second sealing ring 11. Cavities for storing hydraulic oil are respectively arranged inside the first medium container 1001 and the second medium container 1002. A plurality of spools 1003 are arranged between the first medium container 1001 and the second medium container 1002, and the plurality of spools 1003 are symmetrically located on the outer circumference of the central tube 14 respectively.

[0029] The horizontal center line of the first medium container 1001, the horizontal center line of the second medium container 1002, and the horizontal center line of the spool 1003 are the same straight line. The horizontal center line of the first medium container 1001, the horizontal center line of the second medium container 1002, the horizontal center line of the spool 1003, and the horizontal center line of the central tube 14 are parallel to each other. When the horizontal center line of the first medium container 1001, the horizontal center line of the second medium container 1002, and the horizontal center line of the central tube 14 are not on the same straight line, when the first medium container 1001 and the second medium container 1002 change in volume, the central tube 14 will be subjected to transverse stress, and the transverse stress will cause the central tube 14 to be stressed unevenly, resulting in internal damage to the central tube 14. At the same time, when the central tube 14 is subjected to transverse stress for a long time, multiple times, and in large amounts, the central tube 14 will break, endangering the operation.

[0030] The end face of the first medium container 1001 is parallel to the end face of the second medium container 1002, further eliminating the transverse stress of the central tube 14 and keeping the central tube 14 in horizontal stress balance.

[0031] The spool 1003 of the setting pack-off spool mechanism 10 is an upper one-way spool, and the spool of the releasing spool mechanism 13 is a lower one-way spool. The upper one-way spool and the lower one-way spool are evenly arranged on the outer circumference of the second sealing ring 11 to prevent the transverse stress on the central tube 14 caused by uneven quantity and position of the spools 1003 when the volumes of the first medium container 1001 and the second medium container 1002 change, resulting in damage to the central tube 14. The first medium container 1001 is communicated with the second medium container 1002 through the upper one-way spool, and the second medium container 1002 is communicated with the first medium container 1001 through the lower one-way spool. The hydraulic oil in the first medium container 1001 flows into the second medium container 1002 through the upper one-way spool, and the hydraulic oil in the second medium container 1002 flows into the first medium container 1001 through the lower one-way spool.

[0032] The upper one-way valve core is an upper one-way constant-pressure valve core, and the lower one-way valve core is a lower one-way constant-pressure valve core. Springs are respectively arranged inside the upper one-way constant-pressure valve core and the lower one-way constant-pressure valve core. The spring force of the spring is 4-6 Mpa. By relying on the balance between the spring force and the hydraulic oil pressure to control the opening and closing of the hydraulic oil passage on the upper one-way constant-pressure valve core. When the hydraulic oil pressure is greater than the spring force of the spring, the oil passage is opened, and the hydraulic oil enters from the first medium container 1001 into the second medium container 1002, and the packer performs the setting operation. When the hydraulic oil pressure is less than or equal to the spring force of the spring, the oil passage is closed to prevent the packer from setting in advance. The spring force of the spring is the valve opening force of the upper one-way constant-pressure valve core and is related to the working environment of the packer. When the packer is being lowered into a well with a lot of cuttings, or during operations in deep wells, ultra-deep wells, horizontal wells, and extended-reach wells, increasing the spring force of the spring can ensure the safety during the operation and effectively prevent the rubber cylinder 6 from opening in advance.

[0033] The hole diameter of the upper one-way valve core is smaller than that of the lower one-way valve core. On the one hand, in order to make the setting valve core mechanism 10 have hydraulic damping. After the setting valve core mechanism 10 is compressed by extrusion, the rubber cylinder 6 is slowly and evenly compressed. The rubber cylinder 6 expands and its outer diameter becomes larger, sealing the pipeline to prevent the rubber cylinder 6 from deforming too much in a short time, resulting in the rubber cylinder 6 being broken and losing its elasticity, affecting the setting effect of the packer. On the other hand, the hole diameter of the valve core of the lower one-way valve core is larger. When the packer is released, the hydraulic oil can quickly make the second medium container 1002 enter the first medium container 1001 through the lower one-way valve core, reducing the release operation time and increasing the operation efficiency. At the same time, since the setting time of the packer is relatively long, there are often impurities and debris in the hydraulic oil. The larger hole diameter of the valve core of the lower one-way valve core can also prevent blockage and reduce the probability of failure during release.

[0034] The formula for the hole diameter of the upper one-way valve core is: R = K(V1 - V1'), where R is the hole diameter of the upper one-way valve core, V1 is the volume of the first medium container 1001, V1' is the volume of the first medium container 1001 after setting, and K is the valve core coefficient. The hole diameter R of the valve core is related to the volume change of the first medium container 1001. When the volume change of the first medium container 1001 is large, more hydraulic oil needs to flow through, and the hole diameter R of the valve core also increases. This formula is an accurate calculation of the hole diameter of the valve core 1003 and can better control the stable operation of the packer. The hole diameter of the upper one-way valve core increases as more hydraulic oil needs to flow through, but the increase in the hole diameter of the upper one-way valve core will also cause the spring of the upper one-way constant pressure valve core to close, increasing the difficulty of the hydraulic oil passage, resulting in problems such as incomplete closing of the oil passage, oil leakage, and oil spillage, leading to the failure of the upper one-way constant pressure valve core. Therefore, the hole diameter of the valve core needs to be maintained within a certain range. However, the sizes of the operation pipelines of different packers are different, and the operation requirements are different. Therefore, the K valve core coefficient is used to limit the hole diameter of the valve core.

[0035] The working principle of this embodiment is as follows: The compression packer is placed into the pipeline. After being lowered to the designed depth, the bottom of the compression packer contacts the bottom surface of the well or other supporting structures. Press the upper joint 1 of the connecting central pipe 14 of the packer, so that the packer is squeezed. The first medium container 1001 inside the set compression packer is pressured, and the hydraulic oil in the first medium container 1001 flows into the second medium container 1002 through the upper one-way constant pressure valve core. The hydraulic oil in the second medium container 1002 increases, and the pressure becomes larger. The second medium container 1002 reduces the internal hydraulic pressure by increasing its volume, and the second medium container 1002 squeezes the rubber cylinder 6 through the central pipe 14. The rubber cylinder 6 expands, and its outer diameter becomes larger, sealing the pipeline. When releasing the seal, the hydraulic oil in the second medium container 1002 flows into the first medium container 1001 through the lower one-way valve core.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A repeatable setting compression packer, characterized in that: A rubber barrel shaft (7) is arranged on the outer circumference of the central pipe (14), a rubber barrel (6) is arranged on the outer circumference of the rubber barrel shaft (7), a sealing outer sleeve (5) is arranged at one end of the rubber barrel shaft (7), an upper pressing ring (3) connected to one end of the rubber barrel (6) is arranged on the outer circumference of the sealing outer sleeve (5), a first sealing ring (2) is arranged at one end of the upper pressing ring (3), a sealing core shaft (4) located inside the upper pressing ring (3) is arranged at one end of the first sealing ring (2), an upper joint (1) is arranged at the other end of the first sealing ring (2), a cylinder sleeve (9) connected to the other end of the rubber barrel (6) is arranged at the other end of the rubber barrel shaft (7), a resistance nail (8) is arranged on the cylinder sleeve (9), a second sealing ring (11) is arranged on the outer circumference of the central pipe (14), a plurality of setting valve core mechanisms (10) and releasing valve core mechanisms (13) are arranged on the outer circumference of the second sealing ring (11), and a lower joint (12) is arranged at one end of the cylinder sleeve (9). The structure of the setting valve core mechanism (10) is the same as that of the releasing valve core mechanism (13). The setting valve core mechanism (10) includes a first medium container (1001), a second medium container (1002), and a valve core (1003). The first medium container (1001) and the second medium container (1002) are arranged on the outer circumference of the second sealing ring (11). Cavities for storing hydraulic oil are respectively arranged inside the first medium container (1001) and the second medium container (1002). A plurality of valve cores (1003) are arranged between the first medium container (1001) and the second medium container (1002), and the plurality of valve cores (1003) are symmetrically located on the outer circumference of the second sealing ring (11) respectively.

2. The retrievable setting compression packer according to claim 1, wherein: The horizontal center line of the first medium container (1001), the horizontal center line of the second medium container (1002), and the horizontal center line of the valve core (1003) are the same straight line.

3. The retrievable set compression packer according to claim 1 or 2, characterized in that: The end face of the first medium container (1001) is parallel to the end face of the second medium container (1002).

4. The repeatable setting compression packer according to claim 1, wherein: The horizontal center line of the first medium container (1001), the horizontal center line of the second medium container (1002), the horizontal center line of the valve core (1003), and the horizontal center line of the central pipe (14) are parallel to each other.

5. The retrievable set compression packer according to claim 1, wherein: The valve core (1003) of the setting valve core mechanism (10) is an upper one-way valve core, and the valve core of the releasing valve core mechanism (13) is a lower one-way valve core. The upper one-way valve core and the lower one-way valve core are evenly arranged on the outer circumference of the second sealing ring (11). There are holes on the upper one-way valve core and the lower one-way valve core respectively. The first medium container (1001) communicates with the second medium container (1002) through the upper one-way valve core, and the second medium container (1002) communicates with the first medium container (1001) through the lower one-way valve core.

6. The retrievable setting compression packer according to claim 5, characterized in that: The hole diameter of the upper one-way valve core is smaller than the hole diameter of the lower one-way valve core.

7. The retrievable set compression packer according to claim 5 or 6, characterized in that: The upper one-way valve core is an upper one-way constant pressure valve core, and the lower one-way valve core is a lower one-way constant pressure valve core. Springs are respectively arranged inside the upper one-way constant pressure valve core and the lower one-way constant pressure valve core, and the spring force of the spring is 4 - 6 Mpa.

8. The retrievable set compression packer according to claim 6, characterized in that: The formula for the hole diameter of the upper one-way valve core is: R = K(V1 - V1 ′ ), the hole diameter of the upper one-way valve core is R, the volume of the first medium container (1001) is V1, and the volume of the first medium container (1001) after setting is V1 ′ , and K is the valve core coefficient.

9. The retrievable setting compression packer according to claim 1, wherein: The described anti-resistance nail (8) includes a housing (801) and an inner core (802). The inner core (802) is arranged inside the housing (801), and one end of the inner core (802) is located outside the housing (801).

10. The retrievable set-to-pressure packer according to claim 9, characterized in that: The material of the described housing (801) is copper, and the inner core (802) is a soluble material inner core. The material of the soluble material inner core includes magnesium-based alloy and aluminum-based alloy.

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