A repeatable set packer

Abstract

The application discloses a repeatable setting compression packer, belongs to the technical field of oil production engineering equipment, and is characterized in that a rubber cylinder shaft is arranged on the outer circumference of a central pipe, a rubber cylinder is arranged on the outer circumference of the rubber cylinder shaft, a first sealing ring is arranged at one end of an upper pressing ring, an upper joint is arranged at the other end of the first sealing ring, a cylinder sleeve is arranged at the other end of the rubber cylinder shaft, a 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 a second sealing ring of the central pipe. The compression packer is extruded by pressure to extrude a first medium container in the compression packer, hydraulic oil in the first medium container flows into a second medium container through an upper one-way constant pressure valve core, the hydraulic oil in the second medium container increases, the pressure increases, the second medium container increases in volume, the internal hydraulic pressure decreases, the second medium container extrudes the rubber cylinder through the central pipe, the rubber cylinder expands and the outer diameter increases, the pipeline is sealed, the setting and unsetting of the compression packer are realized, and the actual production needs are met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil production engineering equipment, and particularly relates to a compressible packer capable of repeated setting. BACKGROUND

[0002] Petroleum is a fluid mineral buried deep in the ground. Initially, people called the oil-like liquid mineral produced in nature petroleum, called natural gas for combustible gas, and called asphalt for solid combustible oil mineral. With the in-depth study of minerals, it is realized that they are all hydrocarbon compounds in composition and are related in origin, so they are collectively referred to as 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. Fuel oil refined from petroleum is the main fuel for transportation tools, power station boilers, metallurgical industry and various kilns in building material industry. Liquefied gas and pipeline gas using petroleum as raw material are high-quality fuels for urban residents. Aircraft, tanks and other spacecraft also consume a large amount of petroleum fuel. Therefore, many countries have listed petroleum as a strategic material. Petroleum exploitation refers to the act of excavating and extracting petroleum in places where petroleum is stored. In the process of exploiting petroleum, oil and gas flow from the reservoir to the bottom of the well, and then rise to the wellhead. The essential tool for exploitation is a packer. The packer refers to a downhole tool connected to the upper part of the well string, which is used to seal the annular space of the oil pipe and the casing or open hole wall.

[0003] The setting compression packer is a tool used in pipelines or wellbores, which is used to create a temporary closure or isolation device. This device is commonly used in the fields of oil and gas drilling, groundwater development, geological exploration, etc. The design and function of the setting compression packer include the following aspects: sealing function: the setting compression packer aims to create a temporary closed area in the pipeline or wellbore, so as to carry out pipeline repair, downhole operation, testing or isolation of different strata.

[0004] At present, the mechanical setting packer oil production technology widely used in the field and relatively mature can be divided into two categories according to the type of pipe string: the whole production pipe string composed of Y111 packer and Y211 or Y221 downhole tools, and the release production pipe string. The whole production pipe string is welcomed by field users due to its simple structure, easy operation and low cost. However, it has the following disadvantages: on the one hand, the mechanical packer is commonly used for setting in the middle, and the rubber tube is damaged to a certain extent; on the other hand, Y111 packer and Y221 or Y221 packer are used together for downhole layering and sealing oil production. When Y111 packer and Y221 or Y221 packer are used together, it is difficult to realize that Y111 packer is set behind Y221 or Y221 packer when setting is needed, and Y221 or Y221 packer is released first when releasing is needed. SUMMARY

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

[0006] The technical solution adopted to solve the above-mentioned technical problem is that a rubber tube shaft is arranged on the outer circumference of the central tube, a rubber tube is arranged on the outer circumference of the rubber tube shaft, a sealing sleeve is arranged at one end of the rubber tube shaft, an upper compression ring connected with one end of the rubber tube is arranged on the outer circumference of the sealing sleeve, a first sealing ring is arranged at one end of the upper compression ring, a sealing mandrel located inside the upper compression 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 with the other end of the rubber tube is arranged at the other end of the rubber tube shaft, a resistance nail is 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 unsetting 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 structure of the setting valve core mechanism is the same as that of the unsetting valve core mechanism, the setting valve core mechanism comprises 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 arranged in the first medium container and the second medium container respectively, 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 arranged on the outer circumference of the second sealing ring.

[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 surface of the first medium container and the end surface of the second medium container are parallel to each other.

[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, the valve core of the unsetting valve core mechanism is a lower one-way valve core, the upper one-way valve core and the lower one-way valve core are uniformly arranged on the outer circumference of the second sealing ring, the upper one-way valve core and the lower one-way valve core have holes respectively, the first medium container and the second medium container are in communication with each other through the upper one-way valve core, and the second medium container and the first medium container are in communication with each other 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 arranged in the upper one-way constant pressure valve core and the lower one-way constant pressure valve core respectively, and the spring force of the spring is 4-6 Mpa.

[0013] Further, the formula of 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, the volume of the first medium container after setting is V1 ′ , and K is a valve core coefficient.

[0014] Further, the anti-resistance nail comprises a shell and an inner core, the inner core is arranged in the shell, one end of the inner core is located outside the shell,

[0015] Further, the shell is made of copper, and the inner core is a soluble material inner core, the material of the soluble material inner core comprises a magnesium-based alloy and an aluminum-based alloy.

[0016] The beneficial effects of the present application are as follows: (1) the present application adopts the upper joint of the connection center pipe of the pressing packer, so that the packer is pressed, the setting compression type packer is pressed to press the first medium container in the packer, the hydraulic oil of 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, the pressure becomes larger, the second medium container increases in volume, the internal hydraulic pressure decreases, the second medium container is pressed through the center pipe, the rubber sleeve expands, the outer diameter becomes larger, the pipeline is sealed, when the packer is unsealed, the hydraulic oil in the second medium container flows into the first medium container through the lower one-way valve core, the setting and unsetting of the compression type packer are realized, and the actual production needs are met. The present application has the advantages of convenient operation and high working efficiency.

[0017] (2) the present application adopts the hydraulic shearing anti-resistance nail through small pressure, the packer can be quickly set, the setting pressure is reduced, and the use of the packer is facilitated.

[0018] (3) the present application adopts the second sealing ring arranged on the outer circumference of the center pipe, the second sealing ring can make the force of the area in contact with the first medium container and the second medium container uniform, prevent the distance of the second medium container moving up and down along the center pipe from exceeding the maximum deformation range of the rubber sleeve, cause damage to the rubber sleeve, affect the subsequent reuse of the packer, and prevent the compression type packer from deviating. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0020] Figure 1is a structural schematic diagram of an embodiment of the repeatable setting compression packer of the present application.

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

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

[0023] Reference signs: 1, upper joint; 2, first sealing ring; 3, upper compression ring; 4, sealing mandrel; 5, sealing outer sleeve; 6, rubber tube; 7, rubber tube shaft; 8, resistance pin; 9, cylinder sleeve; 10, setting valve core mechanism; 11, second sealing ring; 12, lower joint; 13, unsetting valve core mechanism; 14, central tube; 801, outer shell; 802, inner core; 1001, first medium container; 1002, second medium container; 1003, valve core. DETAILED DESCRIPTION

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

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

[0026] As Figure 1As shown, the resetting compression packer of this embodiment includes an upper connector 1, a first sealing ring 2, an upper pressure ring 3, a sealing mandrel 4, a sealing outer sleeve 5, a rubber sleeve 6, a rubber sleeve shaft 7, an anti-blocking pin 8, a cylinder liner 9, a setting valve core mechanism 10, a second sealing ring 11, a lower connector 12, a release valve core mechanism 13, and a central tube 14. A rubber sleeve shaft 7 is arranged on the outer circumference of the central tube 14, and a rubber sleeve 6 is arranged on the outer circumference of the rubber sleeve shaft 7. A sealing outer sleeve 5 is arranged at one end of the rubber sleeve shaft 7, and an upper pressure ring 3 connected to one end of the rubber sleeve 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 pressure ring 3, and a first sealing ring 2 is arranged at one end of the first sealing ring 2. A sealing mandrel 4 is located inside the upper pressure ring 3. An upper connector 1 is provided at the other end of the first sealing ring 2. A cylinder liner 9, connected to the other end of the rubber sleeve 6, is provided at the other end of the rubber sleeve 7. Anti-blocking pins 8 are provided on the cylinder liner 9. A second sealing ring 11 is provided on the outer circumference of the central tube 14. The second sealing ring 11 ensures that the contact area with the first medium container 1001 and the second medium container 1002 is evenly stressed, preventing the second medium container 1002 from moving up and down along the central tube 14 axially beyond the maximum deformation range of the rubber sleeve 6, thus preventing damage to the rubber sleeve 6 and affecting the subsequent reuse of the packer, and preventing displacement of the compression packer. Multiple setting valve core mechanisms 10 and unsealing valve core mechanisms 13 are provided on the outer circumference of the second sealing ring 11. A lower connector 12 is provided at one end of the cylinder liner 9.

[0027] like Figure 2 As shown, the anti-locking pin 8 includes an outer shell 801 and an inner core 802. The inner core 802 is disposed inside the outer shell 801, with one end of the inner core 802 located outside the outer shell 801. The outer shell 801 is made of copper, and the inner core 802 is made of a soluble material, including magnesium-based alloys and aluminum-based alloys, to prevent the packer from setting prematurely. The frictional force of the well wall on the packer ultimately acts on the anti-locking pin 8, not on the setting valve core mechanism 10, effectively preventing the packer from setting prematurely during the installation process and improving the operability of the packer when installation is difficult. Before the packer sets, the anti-locking pin 8 can withstand greater pressure and smoothly enter the designated position. At the same time, when the packer is placed into the well, the soluble material inner core, because at least one end face of the inner core 802 is exposed outside the outer shell 801, can contact the well fluid. The soluble material inner core will dissolve into powder under the influence of the well medium, temperature, and other factors. As the packer is lowered, the soluble core material gradually dissolves. Once it reaches the designated position or after a certain period of time, the soluble core material completely dissolves, leaving only the outer shell 801 structure of the anti-resistance nail 8. By hydraulically shearing the anti-resistance nail 8 with relatively low pressure, the packer can be quickly set, reducing the setting pressure and making the packer easier to use.

[0028] like Figure 3As shown, 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. The first medium container 1001 and the second medium container 1002 are respectively provided with cavities for storing hydraulic oil. Multiple valve cores 1003 are arranged between the first medium container 1001 and the second medium container 1002. The multiple valve cores 1003 are symmetrically located on the outer circumference of the central tube 14.

[0029] The horizontal centerlines of the first medium container 1001, the second medium container 1002, and the valve core 1003 are all aligned on the same straight line. These lines are parallel to the horizontal centerline of the central tube 14. When the horizontal centerlines of the first medium container 1001, the second medium container 1002, and the central tube 14 are not aligned on the same straight line, the central tube 14 will be subjected to lateral stress when the volumes of the first and second medium containers 1001 and 1002 change. This lateral stress will cause an imbalance in the stress on the central tube 14, resulting in internal damage. Furthermore, prolonged, repeated, and excessive lateral stress on the central tube 14 can cause it to break, jeopardizing operations.

[0030] The end face of the first medium container 1001 is parallel to the end face of the second medium container 1002, which further eliminates the lateral stress of the central tube 14 and keeps the central tube 14 in horizontal force balance.

[0031] The valve core 1003 of the setting valve core mechanism 10 is an upper one-way valve core, and the valve core of the unsealing valve core mechanism 13 is a lower one-way valve core. The upper and lower one-way valve cores are evenly arranged on the outer circumference of the second sealing ring 11 to prevent uneven distribution of the number and position of valve cores 1003 when the volumes of the first medium container 1001 and the second medium container 1002 change, which could cause lateral stress on the central tube 14 and damage to the central tube 14. The first medium container 1001 is interconnected with the second medium container 1002 through the upper one-way valve core, and the second medium container 1002 is interconnected with the first medium container 1001 through the lower one-way valve core. The hydraulic oil in the first medium container 1001 flows into the second medium container 1002 through the upper one-way valve core, and the hydraulic oil in the second medium container 1002 flows into the first medium container 1001 through the lower one-way valve core.

[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 directional constant pressure valve core. Both the upper and lower one-way constant pressure valve cores are equipped with springs, with a spring force of 4-6 MPa. The opening and closing of the hydraulic oil passage on the upper one-way constant pressure valve core is controlled by the balance between the spring force and the hydraulic oil pressure. When the hydraulic oil pressure is greater than the spring force, the oil passage opens, and hydraulic oil enters the second medium container 1002 from the first medium container 1001, allowing the packer to set. When the hydraulic oil pressure is less than or equal to the spring force, the oil passage closes, preventing premature setting of the packer. The spring force 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 inserted into a well with a lot of cuttings, or during operations in deep wells, ultra-deep wells, horizontal wells, and wells with large reach, increasing the spring force can ensure safety during operation and effectively prevent premature opening of the packer sleeve 6.

[0033] The orifice diameter of the upper one-way valve core is smaller than that of the lower one-way valve core. On the one hand, this is to enable the setting valve core mechanism 10 to have hydraulic damping. After the setting valve core mechanism 10 is compressed, the rubber sleeve 6 is slowly and evenly compressed, causing the rubber sleeve 6 to expand and its outer diameter to increase, thus sealing the pipeline and preventing the rubber sleeve 6 from deforming too much in a short time, causing it to break and lose its elasticity, which would affect the setting effect of the packer. On the other hand, the valve core orifice diameter of the lower one-way valve core is larger so that when the packer is unsealed, the hydraulic oil can quickly allow the second medium container 1002 to enter the first medium container 1001 through the lower one-way valve core, reducing the unsealing operation time and increasing the operation efficiency. At the same time, since the packer setting time is relatively long, there are often impurities and debris in the hydraulic oil. The larger valve core orifice diameter of the lower one-way valve core can also prevent blockage and reduce the probability of failure during unsealing.

[0034] The formula for the orifice diameter of the upper one-way valve core is: R = K(V1 - V1′), where R is the orifice 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 orifice 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 orifice diameter R of the valve core also increases accordingly. This formula is a precise calculation of the orifice diameter of the valve core 1003, which can better control the stable operation of the packer. As the amount of hydraulic oil flowing through the upper check valve core increases, the orifice diameter of the upper check valve core also increases. However, this larger orifice diameter can also cause the spring of the upper check constant pressure valve core to close, making it more difficult for the hydraulic oil passage to close properly. This can lead to problems such as incomplete closure of the oil passage, oil leakage, and ultimately, failure of the upper check constant pressure valve core. Therefore, the orifice diameter needs to be kept within a certain range. However, different packers have different operating pipe sizes and different operational requirements, so the K valve core coefficient is used to limit the orifice diameter.

[0035] The working principle of this embodiment is as follows: The compression packer is placed in the pipeline and lowered to the designed depth. The bottom of the compression packer is pressed against the bottom surface of the well or other supporting structure, pressing the upper connector 1 of the connecting center pipe 14 of the packer, so that the packer is squeezed and the compression packer is set. The pressure squeezes the first medium container 1001 inside the packer. 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 increases. The second medium container 1002 increases in volume, reducing the internal hydraulic pressure. The second medium container 1002 squeezes the rubber cylinder 6 through the center pipe 14. The rubber cylinder 6 expands and the outer diameter increases, sealing the pipeline. When unsealing, 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 not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A re-setting compression packer, characterized in that: A rubber tube shaft (7) is provided on the outer circumference of the central tube (14), a rubber tube (6) is provided on the outer circumference of the rubber tube shaft (7), a sealing sleeve (5) is provided at one end of the rubber tube shaft (7), an upper pressure ring (3) connected to one end of the rubber tube (6) is provided on the outer circumference of the sealing sleeve (5), a first sealing ring (2) is provided at one end of the upper pressure ring (3), a sealing core shaft (4) located inside the upper pressure ring (3) is provided at one end of the first sealing ring (2), an upper connector (1) is provided at the other end of the first sealing ring (2), a cylinder sleeve (9) connected to the other end of the rubber tube shaft (7) is provided at the other end of the rubber tube shaft (7), an anti-blocking nail (8) is provided on the cylinder sleeve (9), a second sealing ring (11) is provided on the outer circumference of the central tube (14), a plurality of setting valve core mechanisms (10) and unsealing valve core mechanisms (13) are provided on the outer circumference of the second sealing ring (11), and a lower connector (12) is provided at one end of the cylinder sleeve (9). The structure of the setting valve core mechanism (10) is the same as that of the unsealing 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). The first medium container (1001) and the second medium container (1002) are respectively provided with cavities for storing hydraulic oil. Multiple valve cores (1003) are arranged between the first medium container (1001) and the second medium container (1002). The multiple valve cores (1003) are symmetrically located on the outer circumference of the second sealing ring (11).

2. The reconfigurable compression packer according to claim 1, characterized in that: 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 reconfigurable 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 reconfigurable compression packer according to claim 1, characterized in that: The horizontal center lines of the first medium container (1001), the second medium container (1002), the valve core (1003), and the central tube (14) are parallel to each other.

5. The reconfigurable compression packer according to claim 1, characterized in that: The valve core (1003) of the setting valve core mechanism (10) is an upper one-way valve core, and the valve core of the unsealing 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). The upper one-way valve core and the lower one-way valve core have holes respectively. The first medium container (1001) is connected to the second medium container (1002) through the upper one-way valve core, and the second medium container (1002) is connected to the first medium container (1001) through the lower one-way valve core.

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

7. The reconfigurable 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 directional constant pressure valve core. Springs are respectively installed inside the upper one-way constant pressure valve core and the lower directional constant pressure valve core, and the spring force is 4-6 MPa.

8. The reconfigurable compression packer according to claim 6, characterized in that: The formula for the orifice diameter of the upper one-way valve core is: R = K(V1 - V1) ′ The orifice 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. ′ K is the valve core coefficient.

9. The reconfigurable compression packer according to claim 1, characterized in that: The anti-drag nail (8) includes an outer shell (801) and an inner core (802). The inner core (802) is disposed inside the outer shell (801), and one end of the inner core (802) is located outside the outer shell (801).

10. The reconfigurable compression packer according to claim 9, characterized in that: The outer shell (801) is made of copper, and the inner core (802) is made of a soluble material, which includes magnesium-based alloys and aluminum-based alloys.

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