Compression type electric push rod packer

Abstract

The utility model discloses a compression type electric push rod packer which is provided with an electric push rod motor and a rubber sleeve, and the electric push rod motor is installed on the upper portion of a central pipe through a motor assembling cover and a piston cover which are connected with the central pipe. A spacer ring is installed between the rubber sleeves, an electric push rod of an electric push rod motor can abut against the upper end face of the piston, and the electric push rod motor is electrically connected with a ground control cabinet through an underground cable and a cable threading hole. Setting and unsealing processes of the packer are completed through the electric push rod motor, operation is easy and convenient, control is flexible, and repeated use can be achieved. Under the condition that large oil well operation equipment such as a workover truck, a pump truck and a tank truck is not used, the setting and unsetting processes of the packer are completed, control is easy and convenient, the construction operation cost is remarkably reduced, the labor intensity of workers is reduced, the construction efficiency is effectively improved, and the using effect is remarkable.

Description

Technical Field

[0001] The utility model belongs to the technical field of downhole tools for oil and gas field development and production in the petroleum industry, and particularly relates to a compression type electric push rod packer. Background Art

[0002] A packer is a downhole tool that utilizes elastic sealing elements, such as rubber, plastic, or metal, to seal the annular space between the central pipe and casing, isolating different strata and thus achieving inter-layer isolation and casing protection. It is widely used in oil production processes such as completion, water injection, fracturing, acidizing, sand control, mechanical oil recovery, and gas lift. Therefore, the development of packers is closely linked to the development of the oil industry.

[0003] There are many types of downhole packers currently used at home and abroad with diverse structures, but they mainly rely on mechanical force and water pressure difference as power. The setting and unsealing processes of the packers often require the assistance of large oil well operation equipment such as well repair vehicles, pump trucks, and tank trucks. At the same time, the structure of the packers is complex and difficult to manufacture. The labor intensity of employees on the production site is high, the flexibility is poor, the operating cost is high, and the production cost is high.

[0004] In order to solve the above problems, on-site technicians have made many improvements and developed the following related patented technologies:

[0005] Chinese Patent Authorization Publication No. CN113236176B discloses an electric push rod packer, which relates to the technical field of downhole drilling and production tools for oil and gas field development. The packer comprises a central tube, with an upper limit ring provided on the outer side of the central tube, a limit sleeve sleeved on the outer side of the central tube, a lower joint threadedly connected to the outer side of the lower end of the central tube, an electric push rod provided on the upper side of the limit sleeve, a push ring sleeved on the outer side of the limit sleeve, a lower limit ring provided on the outer side of the lower end of the limit sleeve, and several compression rubber sleeves sleeved on the outer side of the limit sleeve. The piston rod of the electric push rod contacts the push ring, which contacts the compression rubber sleeve, which contacts the lower limit ring.

[0006] The above invention is easy to use. It uses an electric push rod to drive a push ring to squeeze the compressed rubber cylinder, thereby deforming the compressed rubber cylinder to seal it. To release the seal, it only needs to control the electric push rod to retract, which is simple to operate. However, its complex structure and cumbersome operation not only increase the manufacturing cost but also easily lead to operational failures.

[0007] Chinese patent authorization announcement number CN212479162U discloses a horizontal well electric packer rubber cartridge device. The rubber cartridge device is equipped with a filtering device, which can allow rubber debris peeled off from the rubber cartridge assembly to enter the equipment pipe string to the right of the rubber cartridge in the electric packer along with the oil, thereby improving the reliability of the device.

[0008] The expansion of the rubber cylinder in the above patented technology is achieved through hydraulic pressure. It is not an electric packer device and cannot independently complete setting and unsealing. It is only used as a partial accessory of the electric packer.

[0009] Chinese patent authorization announcement number CN208024325U discloses an electric packer that is controlled by a solenoid valve in a complex oil circuit integrated within the packer, switching between different working oil circuits to achieve the purpose of setting and unsealing. The electric motor and plunger pump used are both hollow annular.

[0010] The motor and plunger pump in the above patented technology are both hollow ring-shaped and not conventional models. They need to be specially customized and are difficult to process. In addition, many solenoid valves are required in this oil circuit, and the space in the packer is small. Problems such as the distribution, fixation and power supply of the solenoid valves are difficult to solve.

[0011] In summary, the current downhole packer still needs to be improved. Summary of the Invention

[0012] The purpose of this utility model is to provide a compression-type electric push rod packer that addresses the current situation where the setting and release of downhole packers often require the use of large oil well operation equipment such as workover vehicles, pump trucks, and tank trucks. The utility model also improves the internal structure of the packer, facilitating its manufacture and enhancing operational flexibility. This reduces downhole operation costs, lowers employee labor intensity, improves construction efficiency, and lowers production costs.

[0013] The technical solution of the utility model is: a compression type electric push rod packer, provided with an electric push rod motor and a rubber cylinder, wherein: the electric push rod motor is installed on the upper part of the central tube through a motor assembly cover and a piston cover connected to the central tube, and a cable threading hole is provided in the motor assembly cover; the upper part of the piston and the spring are installed in the piston cover, and the lower part of the piston is installed in the guide sleeve, and the rubber cylinder and the lower joint are sequentially installed below the guide sleeve that is sleeved on the outside of the central tube; a spacer ring is installed between the rubber cylinders, and the electric push rod of the electric push rod motor can be pressed against the upper end face of the piston, and the electric push rod motor is electrically connected to the ground control cabinet through the downhole cable and the cable threading hole.

[0014] Preferably, the rubber cylinder includes but is not limited to an upper rubber cylinder and a lower rubber cylinder, and the number of the rubber cylinders used is determined according to the sealing pressure required in the well where the compression electric push rod packer is used and the well wall working conditions.

[0015] Preferably, the spacer ring is a rigid spacer ring.

[0016] Preferably, the outer circle of the center tube is a non-uniform outer circle and is provided with four sections of connecting threads and two connecting steps; the two connecting steps are respectively the motor assembly cover connecting step and the piston cover connecting step; the four sections of connecting threads are all external threads and are respectively provided at both ends of the center tube, the outer circle of the motor assembly cover connecting step and the outer circle of the piston cover connecting step.

[0017] Preferably, the external thread on the upper end of the center tube is an oil pipe thread and can be connected to an oil pipe coupling or an oil pipe; the external thread on the outside of the motor assembly cover connecting step can be connected to the motor assembly cover, and a sealing ring can also be installed between the motor assembly cover connecting step and the motor assembly cover; the external thread on the outside of the piston cover connecting step can be connected to the piston cover; the external thread on the lower end of the center tube can be connected to the lower joint thread.

[0018] Preferably, a push rod motor mounting groove is formed between the motor assembly cover connecting step and the piston cover connecting step outside the central tube.

[0019] Preferably, a cable threading hole is provided in the upper body of the motor assembly cover and the lower body is the motor assembly cavity. The cable threading hole is a through hole axially and evenly arranged in the upper body of the motor assembly cover. The upper end of the cable threading hole is connected with the oil casing annulus and the lower end is connected with the motor assembly cavity. The inner diameter of the cable threading hole is larger than the outer diameter of the downhole cable used by the electric push rod motor; a sealing sleeve is installed between the downhole cable and the cable threading hole, and the number of cable threading holes arranged in the motor assembly cover is consistent with the number of electric push rod motors.

[0020] Preferably, the upper outer circle of the piston is provided with a spring compression step, the lower inner cavity of the piston cover is provided with a spring assembly platform, and the spring is installed between the spring compression step in the piston and the spring assembly platform in the piston cover.

[0021] Preferably, the driving motor in the electric push rod motor is an AC motor; the number of electric push rod motors installed is determined according to the setting force required by the compression electric push rod packer in the well; the compression distance of the spring is greater than the outward tension distance of the rubber cylinder.

[0022] Preferably, the inner cavity of the lower joint is provided with a center pipe limiting step and the internal thread in the lower inner cavity is an oil pipe thread, and the compression electric push rod packer is connected to the construction pipe string through the center pipe and the lower joint.

[0023] Compared with existing technologies, this new device boasts significant advantages: it utilizes electric push rods and motors to set and release the packer, offering simple operation, flexible control, and reusability. This significantly simplifies the downhole packer setting and release process, reducing operating costs and employee workload. Specifically, the packer's setting force is provided by evenly spaced electric push rods and motors, ensuring stable and uniform application of sufficient pressure to the rubber cartridge to complete the setting process.

[0024] Secondly, the unsealing force during the unsealing process is not only provided by the electric push rod motor, but also cooperates with the compression and recovery tension of the spring, making the unsealing process more convenient and effective.

[0025] Third, the movement of the electric push rod motor is completed by relying on the downhole cable and through the control system in the ground control cabinet. The control is convenient and flexible, and the stroke of the electric push rod can be precisely controlled, making the setting and unsealing process of the packer more accurate and reliable.

[0026] Fourth, the number of electric push rod motors used is determined according to the required seating force of the compression electric push rod packer in the well, and has strong applicability.

[0027] Fifth, the packer can be reused, which can effectively reduce production costs.

[0028] The utility model can power the electric push rod motor through the downhole cable, and complete the sealing and unsealing process of the packer without using large oil well operation equipment such as well-repair vehicles, pump vehicles, and tank trucks. The control is simple, which significantly reduces the construction operation cost and the labor intensity of employees, effectively improves the construction efficiency, and has a significant use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a structural diagram of the present utility model.

[0031] In the figure: center tube 1, push rod motor mounting groove 101; motor assembly cover 2, cable threading hole 21; electric push rod motor 3, push rod working hole 31; piston 4, spring 5, piston cover 6, guide sleeve 7, upper rubber cylinder 8, spacer ring 9, lower rubber cylinder 10, lower joint 11. DETAILED DESCRIPTION

[0032] The accompanying drawings are for reference and illustration purposes only and are not intended to limit the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 intended to limit the present invention.

[0034] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0035] See also Figure 1 A compression type electric push rod packer is provided with an electric push rod motor 3 and a rubber cylinder, wherein: the electric push rod motor 3 is installed on the upper part of the central pipe 1 through a motor assembly cover 2 and a piston cover 6 connected to the central pipe 1, and a cable threading hole 21 is provided in the motor assembly cover 2; the upper part of the piston 4 and the spring 5 are installed in the piston cover 6, and the lower part of the piston 4 is installed in the guide sleeve 7, and the rubber cylinder and the lower joint 11 are sequentially installed below the guide sleeve 7 which is sleeved on the outside of the central pipe 1; a spacer ring 9 is installed between the rubber cylinders, and the electric push rod of the electric push rod motor 3 can be against the upper end surface of the piston 4, and the electric push rod motor 3 is electrically connected to the ground control cabinet through the downhole cable and the cable threading hole 21.

[0036] The electric push rod motor 3 in this utility model is a mature existing technology, mainly composed of a drive motor, a push rod, and a reduction gear. It can convert the rotational motion of the push rod of the drive motor into linear reciprocating motion of the push rod. The utility model uses the forward and reverse rotation of the drive motor in the electric push rod motor 3 to achieve reciprocating motion within the compression range of the spring 5.

[0037] Since the upper part of the piston 4 and the spring 5 are installed in the piston cover 6, the lower part of the piston 4 is installed in the guide sleeve 7, the guide sleeve 7 is sleeved on the outside of the central tube 1 and the rubber cylinder and the lower joint 11 are sleeved on the bottom in sequence, making the setting and unsealing operations of the device simple, flexible and reliable.

[0038] When the packer is lowered to the designed position underground along the construction pipe string and needs to be set: the electric push rod motor 3 is started on the ground through the ground control cabinet, so that the electric push rod moves downward in a straight line; in the process of the electric push rod leaning against the upper end surface of the piston 4 and moving downward, the spring 5 is compressed by the piston 4, and then the rubber cylinder between the guide sleeve 7 and the lower joint 11 is compressed through the guide sleeve 7 to expand outward, and its radial size also increases accordingly, and it is tightened in the inner wall of the casing, completing the setting of the packer.

[0039] When the packer needs to be unsealed due to operational needs or following the construction pipe string, the electric push rod motor 3 is started and rotated in the opposite direction through the ground control cabinet. The electric push rod moves upward and releases the piston 4. Under the action of the spring 5 and the contraction of the rubber cylinder itself, the rubber cylinder retracts, completing the unsealing of the device.

[0040] The utility model has a simple structure and is easy to manufacture, which can significantly reduce the manufacturing cost. It can effectively solve the current situation where the setting and unsealing process of the downhole packer requires the cooperation and investment of large oil well operation equipment such as well repair vehicles, pump trucks, tank trucks, etc., which leads to high operating costs.

[0041] At the same time, the utility model improves the internal structure of the packer, making it simple and easy to manufacture. While effectively improving operational flexibility, it significantly reduces the failure rate of the packer during the setting and release process. This in turn reduces downhole operation costs, reduces employee labor intensity, improves construction efficiency, and significantly reduces production costs.

[0042] On the basis of the above-mentioned embodiment 1, the present invention also has the following embodiments: A preferred embodiment: the rubber cylinder includes but is not limited to an upper rubber cylinder 8 and a lower rubber cylinder 10, and the number of the rubber cylinders used is determined according to the sealing pressure required in the well where the compression electric push rod packer is used and the well wall working conditions.

[0043] A preferred embodiment: the spacer ring 9 is a rigid spacer ring, which can ensure the compression and expansion effects of the rubber cylinder. The spacer ring 9 can be made of materials such as 35CrMo, 42CrMo or 42# steel.

[0044] A preferred embodiment: the outer circle of the central tube 1 is a non-uniform outer circle and is provided with four sections of connecting threads and two connecting steps; the two connecting steps are respectively the motor assembly cover connecting step and the piston cover connecting step; the four sections of connecting threads are all external threads and are respectively provided at both ends of the central tube 1, the outer circle of the motor assembly cover connecting step and the outer circle of the piston cover connecting step.

[0045] In a preferred embodiment, the external threads at the upper end of the central pipe 1 are tubing threads and can be connected to a tubing coupling or tubing; the external threads on the outer side of the motor assembly cover connecting step can be connected to the motor assembly cover 2, and a sealing ring can be installed between the motor assembly cover connecting step and the motor assembly cover 2; the external threads on the outer side of the piston cover connecting step can be connected to the piston cover 6; and the external threads at the lower end of the central pipe 1 can be threadedly connected to the lower joint 11. If excessive liquid in the well is used, it can seep into the annulus formed by the central pipe 1 and the motor assembly cover 2, causing the electric push rod motor 3 to fail. In this case, a sealing ring can be added between the motor assembly cover connecting step and the motor assembly cover 2 in the central pipe 1 to protect the electric push rod motor 3.

[0046] A preferred embodiment: a push rod motor mounting groove 101 is formed between the motor assembly cover connecting step and the piston cover connecting step on the outside of the central tube 1.

[0047] A preferred embodiment: a cable threading hole 21 is set in the upper body of the motor assembly cover 2 and the lower body is the motor assembly cavity. The cable threading hole 21 is a through hole axially and evenly arranged in the upper body of the motor assembly cover 2. The upper end of the cable threading hole 21 is connected to the oil casing annulus and the lower end is connected to the motor assembly cavity. The inner diameter of the cable threading hole 21 is larger than the outer diameter of the downhole cable used by the electric push rod motor 3; a sealing sleeve is installed between the downhole cable and the cable threading hole 21, and the number of cable threading holes 21 set in the motor assembly cover 2 is consistent with the number of electric push rod motors 3.

[0048] A preferred embodiment: the upper outer circle of the piston 4 is provided with a spring compression step, the lower inner cavity of the piston cover 6 is provided with a spring assembly platform, and the spring 5 is installed between the spring compression step in the piston 4 and the spring assembly platform in the piston cover 6.

[0049] A preferred embodiment: the driving motor in the electric push rod motor 3 is an AC motor; the number of electric push rod motors 3 installed is determined according to the setting force required for the compression electric push rod packer in the well; the compression distance of the spring 5 is greater than the outward tensioning distance of the rubber cylinder, which can better ensure the sealing effect of the packer.

[0050] A preferred embodiment: the inner cavity of the lower joint 11 is provided with a central pipe limiting step and the internal thread in the lower inner cavity is a tubing thread, and the compression electric push rod packer is connected to the construction pipe string through the central pipe 1 and the lower joint 11.

[0051] The embodiments described above are merely typical embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection is not limited to the above description.

Claims

1. A compression type electric push rod packer, provided with an electric push rod motor and a rubber cylinder, characterized by: The electric push rod motor is installed on the upper part of the central tube through the motor assembly cover and the piston cover connected to the central tube, and the motor assembly cover is provided with a cable threading hole; the upper part of the piston and the spring are installed in the piston cover, and the lower part of the piston is installed in the guide sleeve, and the rubber cylinder and the lower joint are sequentially installed under the guide sleeve which is mounted on the outside of the central tube; a spacer ring is installed between the rubber cylinders, and the electric push rod of the electric push rod motor can be pressed against the upper end face of the piston. The electric push rod motor is electrically connected to the ground control cabinet through the downhole cable and the cable threading hole.

2. A compression type electric push rod packer as claimed in claim 1, characterized in that: The rubber cylinder includes but is not limited to an upper rubber cylinder and a lower rubber cylinder. The number of the rubber cylinders used is determined according to the sealing pressure required in the well where the compression electric push rod packer is used and the well wall working conditions.

3. A compression type electric push rod packer as claimed in claim 1, characterized in that: The spacer ring is a rigid spacer ring.

4. A compression type electric push rod packer as claimed in claim 1, characterized in that: The outer circle of the central tube is a non-uniform outer circle and is provided with four sections of connecting threads and two connecting steps; the two connecting steps are respectively the motor assembly cover connecting step and the piston cover connecting step; the four sections of connecting threads are all external threads and are respectively provided at both ends of the central tube, the outer circle of the motor assembly cover connecting step and the outer circle of the piston cover connecting step.

5. A compression type electric push rod packer as claimed in claim 4, characterized in that: The external thread on the upper end of the center tube is an oil pipe thread and can be connected to an oil pipe coupling or an oil pipe; the external thread on the outside of the motor assembly cover connecting step can be connected to the motor assembly cover, and a sealing ring can also be installed between the motor assembly cover connecting step and the motor assembly cover; the external thread on the outside of the piston cover connecting step can be connected to the piston cover; the external thread on the lower end of the center tube can be connected to the lower joint thread.

6. A compression type electric push rod packer as claimed in claim 5, characterized in that: A push rod motor mounting groove is formed between the motor assembly cover connecting step and the piston cover connecting step outside the central tube.

7. A compression type electric push rod packer as claimed in claim 5, characterized in that A cable threading hole is provided in the upper body of the motor assembly cover and the lower body is the motor assembly cavity. The cable threading holes are through holes axially and evenly arranged in the upper body of the motor assembly cover. The upper end of the cable threading hole is connected to the oil casing annulus and the lower end is connected to the motor assembly cavity. The inner diameter of the cable threading hole is larger than the outer diameter of the downhole cable used by the electric push rod motor; a sealing sleeve is installed between the downhole cable and the cable threading hole. The number of cable threading holes provided in the motor assembly cover matches the number of electric push rod motors.

8. The compression type electric push rod packer according to claim 1, characterized in that: The upper outer circle of the piston is provided with a spring compression step, the lower inner cavity of the piston cover is provided with a spring assembly platform, and the spring is installed between the spring compression step in the piston and the spring assembly platform in the piston cover.

9. A compression type electric push rod packer as claimed in claim 2, characterized in that: The driving motor in the electric push rod motor is an AC motor; the number of electric push rod motors installed is determined according to the setting force required by the compression electric push rod packer in the well; the compression distance of the spring is greater than the outward tension distance of the rubber cylinder.

10. The compression type electric push rod packer according to claim 5, characterized in that: The inner cavity of the lower joint is provided with a center pipe limiting step and the internal thread in the lower inner cavity is an oil pipe thread. The compression electric push rod packer is connected to the construction pipe string through the center pipe and the lower joint.

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