Underground oil reservoir decompression active suction oil extraction separation device and technological process
Through the underground reservoir pressure reduction and active suction and production separation device, the oil sleeve unidirectional separator and oil pump are used to reduce the pressure difference of the liquid column, which solves the problem of pressure obstacles in the upper oil layer in the oil well on the lower oil reservoir layer, and improves the reservoir oil output efficiency and recovery rate.
Patent Information
- Application Number
- CN202510751774.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-07-08
AI Technical Summary
In the prior art, the pressure of the upper oil layer in the oil well on the lower reservoir layer hinders the smooth flow of crude oil, resulting in low oil output efficiency and low recovery rate, making it difficult to meet energy demand.
The underground oil reservoir is equipped with an active suction and oil production separation device to reduce the pressure difference of the liquid column in the casing through the cooperation of the oil sleeve unidirectional divider and the oil pump, and the oil flow direction is controlled by an annular sealing locker and sealing assembly to establish a reduced pressure environment.
It improves the recovery rate of the reservoir, enhances the oil output speed and efficiency of the oil well, reduces the mining costs, and meets the growing energy demand.
Smart Images
Figure CN120273654A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of oil production, and in particular to an active suction oil production separation device and a process flow for decompressing an underground oil reservoir. Background Art
[0002] In the field of oil production, reservoir pumping technology is a key means to achieve crude oil production. At present, the reservoir pumping oil production process in the relevant technology mainly relies on the natural pressure difference in the oil well or simple mechanical pumping equipment to produce crude oil. However, with the continuous development of the oil extraction industry and the gradual deepening of oil reservoir development, this technology faces significant problems. In the process of pumping the oil reservoir through the use of casing, the upper oil layer in the oil well will exert a large pressure on the lower reservoir layer. The existence of this pressure seriously hinders the smooth flow of crude oil in the reservoir, making it difficult to move crude oil from the reservoir layer to the wellbore of the oil well, which in turn leads to a significant reduction in the oil production efficiency of the reservoir. The low oil well recovery rate not only prolongs the production cycle of a single well and increases the production cost, but also greatly affects the overall oil production efficiency of the oil well, limits the increase in oil production, and makes it difficult to meet the growing energy demand. Therefore, how to effectively reduce the pressure of the upper oil layer on the reservoir layer and improve the oil production efficiency of the reservoir and the oil well recovery rate has become a key technical problem that needs to be solved urgently in this field. Summary of the invention
[0003] In order to reduce the pressure of the upper oil layer on the reservoir layer and improve the oil production efficiency of the reservoir and the oil well recovery rate, the present application provides an underground reservoir decompression active suction oil production separation device and a process flow.
[0004] First aspect To achieve the above-mentioned purpose, the present invention provides an underground oil reservoir decompression active suction oil production separation device, comprising: An active suction oil production separation device for decompression of a downhole oil reservoir comprises an oil pipe placed in a drilling casing, a sucker rod is arranged in the oil pipe, an oil pump is installed at the bottom of the oil pipe, the oil pump is connected to the sucker rod, a side wall valve for supplying oil to flow into the oil pipe and a drainer for lifting the oil in the oil pipe are installed on the oil pipe, the side wall valve is placed above the oil pump, an oil casing one-way separator arranged around the oil pipe is installed on the outer wall of the oil pipe, the oil casing one-way separator is located between the side wall valve and the oil casing one-way separator, and under the action of the oil casing one-way separator, the oil in the casing can only move from the lower part of the oil casing one-way separator to the upper part of the oil casing one-way separator.
[0005] By adopting the above technical solution, through the cooperation of the oil pump and the sucker rod, oil in the reservoir area of the oil well is pumped, and at the same time, the oil sleeve one-way separator blocks the movement of the oil above the oil sleeve one-way separator to the lower part of the oil sleeve one-way separator, so that the oil pressure above the one-way separator presses on the oil sleeve one-way separator. The liquid column pressure difference in the casing is reduced, and part of the hydraulic pressure is reduced. Coupled with the self-priming and decompression of the oil pump, the resistance during oil production from the reservoir is reduced, making it easier for the oil in the reservoir area to enter the casing and increasing its oil production speed, thereby improving the recovery rate of the reservoir. And when the oil above the oil sleeve one-way separator reaches a certain height, by opening the side wall valve, the oil above the oil sleeve one-way separator enters the tubing through the drainer and is transported upward, so that the liquid level height above the oil sleeve one-way separator is maintained within a certain range, and a decompression environment in the casing is established and maintained.
[0006] Optionally, the oil sleeve one-way separator includes an annular sealing seat fixedly connected to the outer wall of the tubing. The outer wall of the annular sealing seat abuts against the inner wall of the casing and seals the area between the outer wall of the casing and the tubing. An oil inlet hole is provided on the annular sealing seat, and a blocking assembly for restricting the flow direction of the oil in the oil inlet hole is provided at the oil inlet hole.
[0007] By adopting the above technical solution, the area between the outer wall of the tubing and the inner wall of the casing can be blocked by the annular sealing seat. At the same time, the oil can flow from the lower part of the oil sleeve one-way separator to the upper part of the oil sleeve one-way separator through the oil inlet hole, and the flow direction of the oil inlet hole is restricted by the blocking assembly.
[0008] Optionally, the blocking assembly includes a ball seat fixedly connected to the oil inlet hole. A through hole is provided on the ball seat, and a sealing ball for blocking the through hole is provided above the through hole. An elastic member for pressing the sealing ball against the upper end of the through hole is provided in the oil inlet hole.
[0009] By adopting the above technical solution, the sealing ball can be pressed against the upper part of the through hole by the elastic member. Thus, under the abutment of the sealing ball and the elastic member, the oil can only flow from bottom to top.
[0010] Optionally, the elastic member is set as a spring. The spring is fixedly connected between the inner wall of the through hole and the sealing ball and presses the sealing ball against the oil inlet hole.
[0011] By adopting the above technical solution, the spring has good telescopic performance. When the oil is about to pass through the oil inlet hole from bottom to top, the spring can be compressed, so that the sealing ball temporarily stops blocking the oil inlet hole.
[0012] Optionally, the oil-casing one-way separator further includes a sealing soft rubber fixedly connected to the upper end of the ball seat. The sealing soft rubber plugs the connection between the tubing and the casing. Above the sealing soft rubber is connected a sealing limit cover, and a one-way hole is opened on the sealing limit cover, and the one-way hole communicates with the oil inlet hole.
[0013] By adopting the above technical solution, the petroleum on the sealing limit cover can exert pressure on the sealing limit cover, thereby causing the sealing soft rubber to be compressed, so that it tightly fills the gap between the tubing and the casing, and thus plays a role in isolating the petroleum.
[0014] Optionally, a deviation-proof sealing ring for supporting the sealing soft rubber is fixedly connected to the upper end of the ball seat.
[0015] By adopting the above technical solution, the deviation-proof sealing ring can support the sealing soft rubber and guide the compression direction of the sealing soft rubber, ensuring the sealing effect of the sealing soft rubber.
[0016] In the second aspect The downhole oil reservoir pressure reduction active pumping oil production separation process flow, according to the above-mentioned downhole oil reservoir pressure reduction active pumping oil production separation device, includes the following steps: S1: Through the cooperation of the oil pump and the sucker rod, the oil reservoir area in the oil well is initially pumped. S2: The oil-casing one-way separator is used to block the movement of the oil above the oil-casing one-way separator to the lower part of the oil-casing one-way separator, so that the oil pressure above the one-way separator acts on the upper end of the oil-casing one-way separator, and the oil below the oil-casing one-way separator can move through the oil-casing one-way separator to its upper part. S3: When the oil level of the oil above the oil-casing one-way separator reaches a certain level, the oil above the oil-casing one-way separator enters the tubing through the drainer and is transported upward, so that the liquid level height above the oil-casing one-way separator is maintained within a certain range, maintaining the pressure reduction environment in the casing.
[0017] To sum up, the present application includes at least one of the following beneficial technical effects: 1. It can reduce the liquid column pressure difference in the casing, reduce part of the hydraulic pressure, thereby reducing the resistance when the oil reservoir produces liquid, making it easier for the petroleum in the oil reservoir area to enter the casing and increasing its oil production speed, and thus improving the recovery rate of the oil reservoir. 2. It can make the oil above the oil-casing one-way separator enter the tubing through the drainer and be transported upward, so that the liquid level height above the oil-casing one-way separator is maintained within a certain range, establishing and maintaining the pressure reduction environment in the casing. 3. The area between the outer wall of the tubing and the inner wall of the casing is sealed by an annular sealing chuck. Meanwhile, petroleum can flow from the lower part to the upper part of the tubing-casing one-way separator through the oil inlet hole, and the flow direction of the oil inlet hole is restricted by the sealing assembly. Description of the Drawings
[0018] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is Figure 1 a partial enlarged schematic diagram of part A in
[0019] In the figure, 1 is the tubing, 2 is the sucker rod, 3 is the submersible pump, 4 is the sidewall valve, 5 is the liquid discharger, 6 is the one-way separator, 61 is the annular sealing chuck, 611 is the oil inlet hole, 62 is the sealing assembly, 621 is the ball seat, 6211 is the through hole, 622 is the elastic member, 623 is the sealing ball, 63 is the sealing soft rubber, 64 is the sealing limit cover, 641 is the one-way hole, 65 is the anti-deviation sealing ring, and 7 is the casing. Detailed Embodiment
[0020] The following further elaborates on the present application in conjunction with the attached Figure 1 - attached Figure 2 drawings for a more detailed description.
[0021] First aspect An underground oil reservoir pressure reduction and active pumping oil production separation device. Referring to Figure 1 , it includes a tubing 1 placed inside a drilling casing 7, and the tubing 1 is coaxially arranged with the casing 7. A sucker rod 2 is provided inside the tubing 1, and on the ground where the drilling is located, there is an oil production machine for driving the operation of the sucker rod 2. The oil production machine is an oil production device in the prior art and is not shown in the figure.
[0022] A submersible pump 3 is installed at the bottom of the tubing 1. The submersible pump 3 is connected to the sucker rod 2. A sidewall valve 4 is installed on the tubing 1. In this embodiment, the sidewall valve 4 is set as a one-way valve, and the sidewall valve 4 is used to allow petroleum to flow into the tubing 1. A liquid discharger 5 for lifting the petroleum in the tubing 1 is provided on the tubing 1. The liquid discharger 5 is a liquid discharger 5 for lifting petroleum in the prior art. Then, when the oil level in the upper part of the tubing-casing one-way separator 6 reaches a certain height, by opening the sidewall valve 4, the oil in the upper part of the tubing-casing one-way separator 6 enters the tubing 1 through the liquid discharger 5 and is transported upward, so that the liquid level height in the upper part of the tubing-casing one-way separator 6 is maintained within a certain range Referring to Figure 1 and Figure 2 , the sidewall valve 4 is placed above the submersible pump 3, and an annular tubing-casing one-way separator 6 surrounding the tubing 1 is installed on the outer wall of the tubing 1. The tubing-casing one-way separator 6 is located between the sidewall valve 4 and the submersible pump 3.
[0023] The oil-casing one-way separator 6 includes an annular sealing seat 61 fixedly connected to the outer wall of the tubing 1. The outer wall of the annular sealing seat 61 abuts against the inner wall of the casing 7 and seals the area between the outer wall of the casing 7 and the tubing 1. An oil inlet hole 611 is formed in the annular sealing seat 61. In this embodiment, the oil inlet holes 611 are provided in six numbers and are arranged equidistantly around the axis of the annular sealing seat 61. A plugging assembly 62 is provided at the oil inlet hole 611 for restricting the flow direction of the petroleum in the oil inlet hole 611.
[0024] The plugging assembly 62 includes a ball seat 621 fixedly connected to the oil inlet hole 611. A through hole 6211 is formed in the ball seat 621, and the through hole 6211 communicates with the oil inlet hole 611. Above the through hole 6211, there is a sealing ball 623 for plugging the through hole 6211, and an elastic member 622 is provided in the oil inlet hole 611 for pressing the sealing ball 623 against the upper end of the through hole 6211. In this embodiment, the elastic member 622 is provided as a spring, and the spring is fixedly connected between the inner wall of the through hole 6211 and the sealing ball 623 and presses the sealing ball 623 against the oil inlet hole 611.
[0025] Thus, the petroleum below the sealing ball 623 can apply an upward force to the sealing ball 623, causing the spring to compress, and further causing the sealing ball 623 to move upward, so that the sealing ball 623 cancels the plugging of the oil inlet hole 611. Further, under the action of the oil-casing one-way separator 6, the petroleum in the casing 7 can only move from the lower part of the oil-casing one-way separator 6 to the upper part of the oil-casing one-way separator 6. The oil-casing one-way separator 6 further includes a sealing soft rubber 63 fixedly connected to the upper end of the ball seat 621. The sealing soft rubber 63 plugs the connection between the tubing 1 and the casing 7, and an anti-deviation sealing ring 65 for supporting the sealing soft rubber 63 is fixedly connected to the upper end of the ball seat 621. The sealing soft rubber 63 is arranged around the anti-deviation sealing ring 65. A sealing limit cover 64 is connected above the sealing soft rubber 63. The sealing limit cover 64 is provided with one-way holes 641. The one-way holes 641 are provided in six groups, and each group of one-way holes 641 is provided with two. Each group of one-way holes 641 corresponds to and communicates with the oil inlet hole 611.
[0026] The petroleum on the sealing limit cover 64 can apply pressure to the sealing limit cover 64, and further cause the sealing soft rubber 63 to be compressed, so that it more tightly fills the gap between the tubing 1 and the casing 7, improving the sealing performance of the oil-casing one-way separator 6.
[0027] Thus, through the cooperation of the oil pump 3 and the sucker rod 2, the oil reservoir area in the oil well can be pumped, and at the same time, the oil-casing one-way separator 6 blocks the movement of the oil above the oil-casing one-way separator 6 to the lower part of the oil-casing one-way separator 6, so that the oil pressure above the one-way separator 6 presses on the oil-casing one-way separator 6. The liquid column pressure difference in the casing 7 is reduced, making the petroleum in the oil reservoir area easier to enter the casing 7 and increasing its oil production speed.
[0028] The second aspect The present invention provides a downhole reservoir pressure reduction active pumping oil separation process flow, which uses the downhole reservoir pressure reduction active pumping oil separation device in the first aspect, and includes the following steps: S1: Through the cooperation of the oil pump 3 and the sucker rod 2, the reservoir area in the oil well is preliminarily pumped for oil; S2: The oil sleeve one-way separator 6 blocks the movement of the oil above the oil sleeve one-way separator 6 to the lower part of the oil sleeve one-way separator 6, so that the oil pressure above the one-way separator acts on the upper end of the oil sleeve one-way separator 6, and the oil below the oil sleeve one-way separator 6 can move to its upper part through the oil sleeve one-way separator 6; S3: When the oil level of the oil above the oil sleeve one-way separator 6 reaches a certain level, the oil above the oil sleeve one-way separator 6 enters the tubing 1 through the drainer 5 and is transported upward, so that the liquid level height above the oil sleeve one-way separator 6 is maintained within a certain range, and the pressure reduction environment in the casing 7 is maintained.
[0029] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. Downhole reservoir pressure reduction active suction oil production separation device, including a tubing string (1) placed inside a drilling casing (7), wherein a sucker rod (2) is arranged inside the tubing string (1), characterized in that, A submersible pump (3) is installed at the bottom of the tubing (1). The submersible pump (3) is communicated with the sucker rod (2). A sidewall valve (4) for allowing oil to flow into the tubing (1) and a liquid discharger (5) for lifting the oil in the tubing (1) are installed on the tubing (1). The sidewall valve (4) is located above the submersible pump (3). An oil-casing one-way separator (6) surrounding the tubing (1) is installed on the outer wall of the tubing (1). The oil-casing one-way separator (6) is located between the sidewall valve (4) and the submersible pump (3). Under the action of the oil-casing one-way separator (6), the oil in the casing (7) can only move from the lower part of the oil-casing one-way separator (6) to the upper part of the oil-casing one-way separator (6).
2. The downhole reservoir pressure reduction and active suction oil production separation device according to claim 1, wherein, The oil-casing one-way separator (6) includes an annular sealing seat (61) fixedly connected to the outer wall of the tubing (1). The outer wall of the annular sealing seat (61) abuts against the inner wall of the casing (7) and seals the area between the outer wall of the casing (7) and the tubing (1). An oil inlet hole (611) is formed in the annular sealing seat (61). A plugging assembly (62) for restricting the flow direction of the oil in the oil inlet hole (611) is arranged at the oil inlet hole (611).
3. The downhole reservoir pressure reduction active suction oil production separation device according to claim 2, wherein The plugging assembly (62) includes a ball seat (621) fixedly connected to the oil inlet hole (611). A through hole (6211) is formed in the ball seat (621). A sealing ball (623) for plugging the through hole (6211) is arranged above the through hole (6211). An elastic member (622) for pressing the sealing ball (623) against the upper end of the through hole (6211) is arranged in the oil inlet hole (611).
4. The downhole reservoir pressure reduction and active suction oil production separation device according to claim 3, characterized in that The elastic member (622) is arranged as a spring. The spring is fixedly connected between the inner wall of the through hole (6211) and the sealing ball (623) and presses the sealing ball (623) against the oil inlet hole (611).
5. The downhole reservoir pressure reduction active suction oil production separation device according to claim 4, characterized in that, The oil-casing one-way separator (6) further includes a sealing soft rubber (63) fixedly connected to the upper end of the ball seat (621). The sealing soft rubber (63) plugs the connection between the tubing (1) and the casing (7). A sealing limit cover (64) is connected above the sealing soft rubber (63). A one-way hole (641) is formed in the sealing limit cover (64). The one-way hole (641) is communicated with the oil inlet hole (611).
6. The downhole reservoir pressure reduction and active suction oil production separation device according to claim 5, wherein A deviation-proof sealing ring (65) for supporting the sealing soft rubber (63) is fixedly connected to the upper end of the ball seat (621).
7. The downhole reservoir pressure reduction and active suction oil production separation process flow is characterized in that, The downhole oil reservoir pressure reduction active pumping and separating device according to claim 1 includes the following steps: S1: Through the cooperation of the submersible pump (3) and the sucker rod (2), the oil reservoir area in the oil well is initially pumped for oil extraction; S2: The oil in the upper part of the oil-casing one-way separator (6) is blocked from moving to the lower part of the oil-casing one-way separator (6) by the oil-casing one-way separator (6), so that the oil pressure in the upper part of the one-way separator acts on the upper end of the oil-casing one-way separator (6), and the oil in the lower part of the oil-casing one-way separator (6) can move through the oil-casing one-way separator (6) to its upper part; S3: When the oil in the upper part of the oil-casing one-way separator (6) reaches a certain liquid level, the oil in the upper part of the oil-casing one-way separator (6) enters the tubing (1) through the liquid drainer (5) and is transported upward, so that the liquid level height in the upper part of the oil-casing one-way separator (6) is maintained within a certain range, maintaining a reduced-pressure environment in the casing (7).