CN106555570B - Wellhead hydraulic lifting device - Google Patents
Wellhead hydraulic lifting device Download PDFInfo
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- CN106555570B CN106555570B CN201510622879.8A CN201510622879A CN106555570B CN 106555570 B CN106555570 B CN 106555570B CN 201510622879 A CN201510622879 A CN 201510622879A CN 106555570 B CN106555570 B CN 106555570B
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Abstract
The invention relates to an oil gas exploitation device for an oil field, in particular to a wellhead hydraulic lifting device. The invention relates to a wellhead hydraulic lifting device, which comprises an oil cylinder and a well fluid sealing cylinder, wherein the oil cylinder comprises a cylinder body, a piston and a piston rod, the well fluid sealing cylinder comprises an isolation pipe and a sealing rod, the lower part of the oil cylinder is provided with a first sealing element, and the first sealing element, the piston and the piston rod form a hydraulic oil inner cavity; and a second sealing element is arranged in the inner cavity of the well fluid sealing cylinder, and the second sealing element is tightly attached and sealed with the inner wall of the isolation pipe and the sealing rod respectively. By adopting a double-sealing structure of the oil cylinder and the well fluid sealing cylinder and independently working, the hydraulic oil for driving the oil cylinder to work is isolated from the well fluid produced by the oil well, so that the oil cylinder is prevented from being damaged by the well fluid and a hydraulic system of the pumping unit is prevented from being polluted; an energy accumulator is arranged between the oil cylinder and the hydraulic system, so that the damage of the vibration of the underground oil pumping system to the hydraulic system of the oil pumping machine is eliminated, and the long-life and reliable work of the hydraulic oil pumping system is ensured.
Description
Technical Field
The invention relates to an oil gas exploitation device for an oil field, in particular to a wellhead hydraulic lifting device.
Background
A hydraulic pumping unit in ground power equipment for oil exploitation is one of main modes for providing oil well lifting power, and a wellhead lifting oil cylinder is an important component of the hydraulic pumping unit. When the conventional lifting oil cylinder seat is installed at a well head, a piston rod is connected with an oil pumping rod and directly contacts well liquid, and the well liquid is easy to damage the oil cylinder and invade and pollute a hydraulic system, so that system faults are caused, the situations of stopping a pump and the like are caused, and the oil and gas exploitation efficiency is influenced; meanwhile, for oil wells with complex working conditions such as heavy oil wells, insufficient liquid supply wells and the like, the underground oil pumping system often generates large vibration loads, and when a conventional lifting oil cylinder is used, vibration is directly transmitted to the hydraulic system through the oil cylinder and hydraulic oil, so that the service life of the hydraulic system is influenced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the wellhead hydraulic lifting device which is reliable in sealing and capable of reducing the vibration of a hydraulic system, so that an oil cylinder and a well fluid sealing cylinder are sealed and isolated to work independently, and the influence of the vibration of a rod column on the hydraulic system in the oil and gas exploitation process can be effectively reduced.
In order to solve the technical problems, the wellhead hydraulic lifting device comprises an oil cylinder and a well fluid sealing cylinder, wherein the oil cylinder is mechanically connected with the well fluid sealing cylinder, the oil cylinder comprises a cylinder body, a piston arranged in an inner cavity of the oil cylinder and a piston rod tightly connected with the piston, the well fluid sealing cylinder comprises an isolation pipe and a sealing rod, the piston rod is connected with the sealing rod, an oil inlet and an oil outlet are formed in the lower end part of the cylinder body of the oil cylinder, the oil inlet and the oil outlet are connected with a hydraulic system through a hydraulic pipeline, a first sealing element is arranged at the lower part of the inner cavity of the oil cylinder, the first sealing element is tightly attached and sealed with the surface of the inner hole of the cylinder body and the piston rod respectively, and the first sealing element, the cylinder body, the piston and the piston rod form an inner cavity of hydraulic oil of the oil cylinder together; and a second sealing element is arranged in the inner cavity of the well fluid sealing cylinder and is tightly attached to the inner wall of the isolation pipe and the sealing rod respectively.
As an improvement of the invention, an energy accumulator is arranged between the oil inlet and the oil outlet of the oil cylinder and the hydraulic system.
As a further improvement of the invention, a hydraulically controlled check valve is arranged between the accumulator and the hydraulic system.
The accumulator may be a gas-liquid isolated or spring loaded shock absorbing accumulator.
The upper end part of the oil cylinder is also provided with an air filter, and the lower end part of the oil cylinder is provided with an injection port.
As a further improvement of the present invention, a displacement velocity acceleration sensor is arranged on the top end surface of the oil cylinder 1.
As a further improvement of the invention, the first sealing element and the second sealing element are both a combined structure of an elastic sealing element and a rigid sealing element.
Compared with the prior art, the double-sealing structure of the oil cylinder and the well fluid sealing cylinder is adopted, and the oil cylinder and the well fluid sealing cylinder work independently, so that the hydraulic oil for driving the oil cylinder to work is isolated from the well fluid produced by an oil well, and the oil cylinder is prevented from being damaged by the well fluid and a hydraulic system of a pumping unit is prevented from being polluted; the energy accumulator is arranged between the oil cylinder and the hydraulic system, so that vibration energy generated by the underground oil pumping system can be effectively absorbed, vibration damage to the hydraulic system caused by vibration is eliminated, system faults are avoided, and long-life and reliable work of the hydraulic oil pumping system is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a wellhead hydraulic lifting device of the present invention;
FIG. 2 is a schematic diagram of the operation of the lift system.
Detailed Description
The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings, which are provided for reference and illustration purposes only and are not intended to limit the present invention.
As shown in fig. 1, the wellhead hydraulic lifting device comprises an oil cylinder 1 and a well fluid sealing cylinder 2, wherein the oil cylinder 1 is mechanically connected with the well fluid sealing cylinder 2, the oil cylinder 1 comprises a cylinder body 11, a piston 12 arranged in an inner cavity of the oil cylinder 1 and a piston rod 13 tightly connected with the piston 12, the well fluid sealing cylinder 2 comprises an isolation tube 21 and a sealing rod 22, the piston rod 13 is connected with the sealing rod 22, an oil inlet and outlet 16 is arranged at the lower end part of the cylinder body of the oil cylinder 1, the oil inlet and outlet 16 is connected with a hydraulic system 18 through a hydraulic pipeline 19, a first sealing element 14 is arranged at the lower part of the inner cavity of the oil cylinder 1, the first sealing element 14, the cylinder body 11, the piston 12 and the piston rod 13 jointly form a hydraulic oil inner cavity to contain hydraulic oil for driving the oil cylinder to work, and the first sealing element 14 is tightly attached to the inner wall of the cylinder body 11 and the piston rod 13 respectively to ensure sealing; and a second sealing element 23 is arranged in the inner cavity of the well fluid sealing cylinder 2, and the second sealing element 23 is tightly attached and sealed with the inner wall of the isolation pipe 21 and the sealing rod 22 respectively. Through the double-seal cooperation of first sealing member 14 and second sealing member 23, keep apart the hydraulic oil of drive hydro-cylinder 1 work and the well fluid of oil well output completely, ensure the two and do not influence each other, prevent effectively that well fluid from damaging hydro-cylinder 1 and polluting beam-pumping unit hydraulic system 18. In a preferred embodiment, an injection port 17 is further provided at the lower end of the oil cylinder 1, a sealed cavity formed by the first sealing element 14, the isolation pipe 21, the sealing rod 22 and the second sealing element 23 can be communicated with the atmosphere through the injection port 17, and isolation liquid or hydraulic oil can be injected into the sealed cavity formed by the first sealing element 14, the isolation pipe 21, the sealing rod 22 and the second sealing element 23 through the injection port 17, so as to achieve the effect of further isolation, effectively avoid invasion of well liquid and pollution to a hydraulic system of the pumping unit due to sealing failure of the oil cylinder 1, and ensure normal operation of the system. An energy accumulator 3 is arranged between the oil inlet/outlet 16 and the hydraulic system 18, the energy accumulator 3 is preferably a gas-liquid isolation type or spring loading type vibration reduction energy accumulator, and the energy accumulator 3 can effectively absorb vibration energy generated by the underground oil pumping system, eliminate vibration damage of vibration to the hydraulic system 18, avoid system faults and ensure long-life and reliable operation of the hydraulic oil pumping system. Meanwhile, a hydraulic control check valve 5 is arranged between the energy accumulator 3 and the hydraulic system 18, and the oil cylinder 1 can be effectively positioned and braked accurately through the control of the hydraulic control check valve 5. An air filter 15 can be arranged at the upper end of the oil cylinder 1, so that dust and impurities are prevented from entering the oil cylinder 1 to cause damage to the oil cylinder 1. The speed displacement acceleration displacement sensor 4 is arranged on the top end face of the oil cylinder 1, the running position and the abnormal condition of the piston can be monitored in real time, and once the abnormal condition occurs, the hydraulic system can be automatically and rapidly closed to stop the pump, so that technicians can check the abnormal condition in time, and the complex condition is further avoided.
In the preferred embodiment, the first seal 14 and the second seal 23 are both made of a combination of elastic sealing elements and rigid sealing elements, which can satisfy both the requirements of sealing performance and abrasion resistance.
As shown in figure 2, when the wellhead hydraulic lifting device is applied on site, the sealing rod 22 is connected with an oil well pump 20 and an oil pumping rod 7 in a downhole oil pipe 8 through the adapter 9, the flange 6 is connected with a special oil outlet tee 10, and the hydraulic control one-way valve 5 is connected with a hydraulic system 18 of the oil pumping unit through a hydraulic power pipeline and a hydraulic control pipeline. In the normal oil and gas exploitation process, the hydraulic system 18 pumps high-pressure hydraulic oil into the hydraulic lifting device through the hydraulic pipeline 19 and the hydraulic control one-way valve 5, the hydraulic oil enters the oil cylinder 1 through the hydraulic pipeline 19 and the oil inlet/outlet 16, the piston 12 is pushed to move upwards, and the piston rod 13, the sealing rod 22, the oil pumping rod 7 and the downhole oil well pump 20 are driven to move upwards. After the end of the upward stroke is reached, the wellhead hydraulic lifting device is reversed under the control of the hydraulic system 18, the piston 12, the piston rod 13, the sealing rod 22, the sucker rod 7 and the oil well pump 20 run downwards, and hydraulic oil in the inner cavity of the oil cylinder returns to the hydraulic system 18 through the oil inlet/outlet 16, the hydraulic pipeline 19 and the hydraulic control one-way valve 5. During the up-and-down stroke of the piston 12, well fluid of an oil well ascends in an annular space between the oil pipe 8 and the sucker rod 7 and finally enters a ground oil pipeline through an outlet of the special oil outlet tee 10 to complete a production stroke. The wellhead hydraulic lifting device is driven by hydraulic oil to drive the underground oil well pump 20 to reciprocate in cycles through the sucker rod 7 so as to achieve the purpose of oil gas exploitation. In the lifting process, hydraulic oil can enter the energy accumulator 3 through the hydraulic pipeline 19, and when the underground oil pumping system vibrates, the energy accumulator 3 can stabilize pressure oil fluctuation in the oil cylinder by absorbing or releasing the hydraulic oil, so that the vibration of the underground oil pumping system is effectively prevented from being transmitted to the hydraulic system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, but all equivalent variations using the spirit of the present invention should fall within the scope of the present invention.
Claims (3)
1. Well head hydraulic pressure lifting device, including hydro-cylinder and well liquid seal jar, its characterized in that: the well fluid sealing cylinder comprises an isolation pipe and a sealing rod, the piston rod is connected with the sealing rod, an oil inlet and an oil outlet are formed in the lower end of the cylinder body of the oil cylinder, the oil inlet and the oil outlet are connected with a hydraulic system through a hydraulic pipeline, a first sealing element is arranged on the lower portion of the oil cylinder, the first sealing element is tightly attached and sealed with the surface of an inner hole of the cylinder body and the piston rod respectively, and the first sealing element, the cylinder body, the piston and the piston rod jointly form an inner cavity of the hydraulic oil cylinder; a second sealing element is arranged in the inner cavity of the well fluid sealing cylinder and is tightly attached and sealed with the inner wall of the isolation pipe and the sealing rod respectively;
an energy accumulator is arranged between the oil inlet and the oil outlet and the hydraulic system, a hydraulic control check valve is arranged between the energy accumulator and the hydraulic system, a displacement speed acceleration sensor is arranged on the top end face of the oil cylinder, and the first sealing element and the second sealing element are both structures combining an elastic sealing element and a rigid sealing element; the upper end part of the oil cylinder is also provided with an air filter.
2. A wellhead hydraulic lifting device as claimed in claim 1, wherein: the energy accumulator is a gas-liquid isolation type or spring loading type vibration reduction energy accumulator.
3. A wellhead hydraulic lifting device as claimed in claim 1, characterized by: and the lower end part of the oil cylinder is provided with an injection port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510622879.8A CN106555570B (en) | 2015-09-25 | 2015-09-25 | Wellhead hydraulic lifting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510622879.8A CN106555570B (en) | 2015-09-25 | 2015-09-25 | Wellhead hydraulic lifting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106555570A CN106555570A (en) | 2017-04-05 |
| CN106555570B true CN106555570B (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510622879.8A Active CN106555570B (en) | 2015-09-25 | 2015-09-25 | Wellhead hydraulic lifting device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106555570B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026896B (en) * | 2017-06-09 | 2024-05-24 | 中国石油化工股份有限公司 | Movable rod type telescopic isolation type oil well lifting device |
| CN108301810A (en) * | 2018-03-20 | 2018-07-20 | 阜新市石油工具厂 | Direct-connected well head support hydraulic pressure petroleum lifting device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4262742A (en) * | 1979-08-15 | 1981-04-21 | James Robert G | Downhole seal for low profile oil well pumping installations |
| CN2866805Y (en) * | 2006-01-24 | 2007-02-07 | 中国石油化工股份有限公司江苏油田分公司石油工程技术研究院 | Drilling well leakage plugging simulating experimental instrument |
| CN201225263Y (en) * | 2008-05-09 | 2009-04-22 | 北京迪威尔石油天然气技术开发有限公司 | Water-based non-rod oil pumping device |
| CN202140371U (en) * | 2011-08-02 | 2012-02-08 | 肇庆市志成气动有限公司 | Hydraulic oil cylinder |
| CN102536953A (en) * | 2012-04-11 | 2012-07-04 | 海卓泰克液压技术（苏州）有限公司 | Dual-sealing device of oil cylinder |
| CN104019019B (en) * | 2014-05-27 | 2016-12-07 | 许一星 | Energy storage type linear electric motors capsule pump |
| CN205154107U (en) * | 2015-09-25 | 2016-04-13 | 中国石油化工股份有限公司 | Well head hydraulic pressure lifting devices |
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2015
- 2015-09-25 CN CN201510622879.8A patent/CN106555570B/en active Active
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