A gas holdup device for oil fields and method of use thereof

Abstract

This invention relates to the field of petrochemical process enhancement technology, specifically to a gas retention device for oil fields and its usage method. A casing assembly and a gas retention mechanism are arranged on the surface containing an oil layer. The casing assembly is vertically and annularly installed inside the oil well on the surface, and the gas retention mechanism is fitted inside the casing assembly, enabling stable oil extraction within the well. The gas retention mechanism has a serrated structure, and a tooth angle offset mechanism is mounted on the serrated structure. The tooth angle offset mechanism is driven by a control cabinet to deflect the angle of the serrated structure, achieving optimal elastic stress changes for different types of oil, thereby minimizing the rising speed of air bubbles. Simultaneously, when extracting crude oil from the oil layer, large air bubbles within the crude oil are broken into smaller bubbles, reducing the incidence of blowout accidents and improving the safety of oil extraction operations.

Description

Technical Field

[0001] This invention relates to the field of petrochemical process intensification technology, specifically to a gas stagnation device for oil fields and its usage method. Background Technology

[0002] Petroleum is generally considered a pseudoplastic fluid within the power-law fluid category, exhibiting shear-thinning viscoelastic properties. For example... Figure 1 As shown, with current oil pipes, during crude oil extraction, air bubbles are affected by the shear-thinning viscoelasticity of the crude oil as it flows. This causes them to suddenly accelerate during their ascent. Furthermore, due to the high viscosity of crude oil, the bubbles are more likely to remain intact and rise as large bubbles, moving faster than smaller bubbles. This rapid bubble ascent is a significant cause of well blowouts. All of the above explains the problems and causes that current oil pipes used in crude oil extraction can cause.

[0003] Currently, the technical methods for intensifying chemical processes can generally be divided into active and passive methods. Active methods typically introduce external energy, such as electricity, magnetism, and ultrasound, while passive methods generally achieve the intensification goal by modifying and upgrading existing equipment. Most of the currently published related patents involve methods such as magnetic or spiral structures to trap gas, which are structurally complex, have high manufacturing costs, and limited application scope, making widespread adoption in this field difficult.

[0004] Therefore, how to provide a simple tubing structure that can effectively reduce bubble velocity during oil extraction is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the purpose of this invention is to provide an oilfield gas stagnation device and its usage method, so as to solve the technical problem in the prior art that large air bubbles in crude oil rise rapidly with the flow of crude oil, which can easily cause blowout accidents.

[0006] This invention is achieved through the following technical solution:

[0007] An oilfield gas retention device includes a casing assembly, a gas retention mechanism, a pump, and a control cabinet. The casing assembly is sequentially connected to form an annular cylindrical structure. The gas retention mechanism is sleeved inside the casing assembly. The pump is mounted at the outlet end of the gas retention mechanism. The inner wall of the gas retention mechanism has a serrated structure along the pipe direction, and a tooth angle offset mechanism is mounted on the serrated structure to control the angle deflection of the serrated structure. The tooth angle offset mechanism and the drive end of the pump are both connected to the control cabinet.

[0008] Preferably, the gas stagnation mechanism includes an outer ring pipe and an inner component. The outer ring pipe is sleeved inside the casing assembly, and the oil pump is assembled at the outlet end of the outer ring pipe. The inner component has an annular pipe structure, wherein the outer side of the inner component is sleeved inside the outer ring pipe, and the inner side of the inner component is provided with a serrated structure.

[0009] Furthermore, the outer ring tube and the inner component are of equal length, and the two ends of the outer ring tube and the inner component are assembled and fixed. The serrated structure is distributed along the long side of the inner component on the inner side, and the serrated structure is distributed on both sides of the inner wall of the inner component.

[0010] Furthermore, the sawtooth structure includes several sawtooth teeth, each of which is driven to shift an angle on the inner component via a tooth angle shifting mechanism.

[0011] Furthermore, the tooth angle offset mechanism includes a servo motor and a connecting rod. The servo motor is mounted on the upper part of the internal component, and the drive end of the servo motor is connected to the control cabinet. The connecting rod passes through several sawtooth teeth and is connected to the servo motor. The servo motor drives the connecting rod and causes several sawtooth teeth to offset their angles.

[0012] Furthermore, there is a gap between the serrated structures distributed on the two inner sides of the internal component, which serves as a transport channel for extracting crude oil from the oil layer.

[0013] Preferably, it also includes an oil viscosity meter and an oil viscosity acquisition sensor. The oil viscosity acquisition sensor is installed inside the gas stagnation mechanism. The output end of the oil viscosity acquisition sensor is connected to the input end of the oil viscosity meter, and the output end of the oil viscosity meter is connected to the control cabinet.

[0014] Furthermore, the control cabinet is equipped with a controller. The input end of the controller is connected to a signal acquisition module, and the output end is connected to a drive module and a human-machine interaction module. The input end of the signal acquisition module is connected to an oil viscosity acquisition sensor via an oil viscosity detector, and the output end of the drive module is connected to an oil pump and a tooth angle offset mechanism.

[0015] Preferably, the casing assembly includes a plurality of conduits, a plurality of surface casings, a plurality of technical casings, and a plurality of oil layer casings; wherein, the plurality of conduits are sequentially connected and arranged in a ring-shaped outer casing, the plurality of surface casings are sequentially connected and arranged close to the inner side of the plurality of conduits, the plurality of technical casings are sequentially connected and arranged close to the inner side of the plurality of surface casings, the plurality of oil layer casings are sequentially connected and arranged close to the inner side of the plurality of technical casings, and the gas trapping mechanism is sleeved inside the plurality of oil layer casings.

[0016] A method for using a gas retention device for oil fields, based on the aforementioned gas retention device for oil fields, is as follows:

[0017] Oil wells are excavated at the oil-bearing surface, and casing assemblies are arranged sequentially from the oil well to the inner wall of the oil layer. A gas trapping mechanism is fitted inside the casing assembly and extends vertically along the oil well into the oil layer. A pump is installed at the outlet end of the gas trapping mechanism. The control cabinet drives the pump to extract crude oil from the oil layer through the gas trapping mechanism. During crude oil extraction, large air bubbles are present in the crude oil. The control cabinet controls the angle offset of the sawtooth structure of the gas trapping mechanism through a tooth angle offset mechanism to break the large air bubbles in the crude oil into smaller air bubbles, thereby reducing the incidence of blowout accidents.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] This invention provides a gas trapping device for oilfields. A casing assembly and a gas trapping mechanism are arranged on the surface containing an oil layer. The casing assembly is vertically and annularly installed inside the oil well on the surface, and the gas trapping mechanism is fitted inside the casing assembly, enabling stable oil extraction within the oil well. An oil pump is installed at the outlet end of the gas trapping mechanism, and the drive end of the oil pump is connected to a control cabinet. The control cabinet drives the oil pump to facilitate the extraction of crude oil from the oil layer through the gas trapping mechanism. The gas trapping mechanism has a serrated structure, and a tooth angle offset mechanism is installed on the serrated structure. The tooth angle offset mechanism is driven by the control cabinet to deflect the angle of the serrated structure, achieving optimal elastic stress changes for different types of oil, thus minimizing the rise speed of air bubbles. Simultaneously, during the extraction of crude oil from the oil layer, large air bubbles are broken into smaller bubbles, reducing the incidence of blowout accidents and improving the safety of oil extraction operations.

[0020] Furthermore, the gas retention mechanism includes an outer ring pipe and an inner component. The inner component is assembled inside the outer ring pipe. The inner side of the inner component has a serrated structure. Crude oil in the oil layer is extracted by the oil pump through the inner side of the inner component. Large bubbles in the crude oil will break into smaller bubbles when they come into contact with the serrated structure, thus reducing the bubble velocity. At the same time, it changes the elastic stress distribution of the fluid, weakens the phenomenon of bubble velocity jump in viscoelastic fluid, enhances the gas retention effect, reduces the incidence of blowout accidents, and improves the safety of oil pumping operations.

[0021] Furthermore, the outer ring pipe and the inner component are of equal length, and the two ends of the outer ring pipe and the inner component are fixed together, which improves the stability of the assembly of the outer ring pipe and the inner component. This allows large air bubbles to break into smaller air bubbles when they come into contact with the serrated structure as crude oil passes through the inner component. The smaller air bubbles slow down due to the change in the elastic stress distribution of the crude oil, which enhances the gas retention effect, reduces the incidence of blowout accidents, and improves the safety of oil pumping operations.

[0022] Furthermore, the tooth angle offset mechanism includes a servo motor and a connecting rod. The servo motor is mounted on the upper part of the internal component, and the drive end of the servo motor is connected to the control cabinet. The connecting rod passes through several serrated teeth and connects to the servo motor. The servo motor drives the connecting rod and drives several serrated teeth to offset their angles. This facilitates the breaking down of large air bubbles in contact with the serrated teeth into smaller air bubbles by adjusting the angle of the serrated teeth, thereby reducing the incidence of blowout accidents and improving the safety of oil pumping operations.

[0023] Furthermore, the present invention also includes an oil viscosity meter and an oil viscosity acquisition sensor. The oil viscosity acquisition sensor can collect the viscosity of different types of crude oil and transmit it to the oil viscosity meter. After analyzing the oil viscosity, the oil viscosity meter feeds back to the control cabinet. The control cabinet can, according to the oil viscosity, drive the tooth angle offset mechanism to deflect the angle of the sawtooth structure, thereby breaking up large air bubbles in different types of crude oil into smaller air bubbles. At the same time, it adapts to the corresponding crude oil type to achieve the optimal elastic stress distribution, enhances the gas retention effect, reduces the incidence of blowout accidents, and improves the safety of oil pumping operations.

[0024] Furthermore, the casing assembly includes several guide pipes, several surface casings, several technical casings, and several oil layer casings that are sequentially stacked in annular arrangement along the radial direction of the oil well. Finally, the gas stagnation mechanism is fitted inside the several annularly arranged oil layer casings, which improves the stability of the gas stagnation mechanism in the oil well.

[0025] A method for using a gas trapping device in an oilfield involves arranging a gas trapping mechanism inside the oil well. During crude oil extraction, large air bubbles exist within the crude oil. The control cabinet controls the angle of the sawtooth structure of the gas trapping mechanism via a tooth angle offset mechanism. Utilizing the viscoelasticity of crude oil as a non-Newtonian fluid, the sawtooth structure of the internal components alters the distribution characteristics of the viscoelastic stress in the oil fluid, suppressing the elastic modulus and preventing rebound and vibration caused by viscoelasticity, thus achieving the gas trapping effect. Simultaneously, the sawtooth structure breaks down large air bubbles in the crude oil into smaller bubbles, reducing the incidence of blowout accidents and improving the safety of oil extraction operations. Attached Figure Description

[0026] Figure 1 Characteristic diagrams for Newtonian and non-Newtonian fluids;

[0027] Figure 2 This is a schematic diagram of the structure of the oilfield gas retention device arranged in the oil well of the present invention;

[0028] Figure 3 This is a longitudinal cross-sectional schematic diagram of the air stagnation mechanism in this invention;

[0029] Figure 4 This is a three-dimensional schematic diagram of the internal structure of the gas stagnation mechanism in this invention;

[0030] Figure 5 This is a schematic diagram of the control cabinet in this invention.

[0031] In the diagram: 1-Gas retention mechanism; 2-Ground; 3-Oil pump; 4-Control cabinet; 5-Oil layer; 6-Tooth angle offset mechanism; 7-Oil viscosity meter; 8-Oil viscosity acquisition sensor; 9-Conduit; 10-Surface casing cement ring; 11-Surface casing; 12-Technical casing cement ring; 13-Technical casing; 14-Oil layer casing cement ring; 15-Oil layer casing; 16-Outer ring pipe; 17-Internal component; 18-Sawtooth structure; 19-Small bubble; 20-Large bubble; 21-Servo motor; 22-Connecting rod. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings:

[0034] The purpose of this invention is to provide an oilfield gas trapping device and its usage method to solve the technical problem in the prior art where large air bubbles in crude oil rise rapidly with the flow of crude oil, easily causing blowout accidents.

[0035] Specifically, according to Figure 2 As shown, the gas trapping device for the oilfield is located at the ground 2 containing the oil layer 5, and includes a casing assembly, a gas trapping mechanism 1, a pumping unit 3, and a control cabinet 4. An oil well is excavated from the ground 2 to the oil layer 5. The casing assembly is vertically arranged in a ring inside the oil well. The gas trapping mechanism 1 is fitted inside the casing assembly and extends vertically along the oil well into the oil layer 5. The pumping unit 4 is on the ground 2 and is mounted at the outlet end of the gas trapping mechanism 1. The control cabinet 4 is placed on the ground 2. The gas trapping mechanism 1 has a serrated structure 18 along its inner wall, and a tooth angle offset mechanism 6 is mounted on the serrated structure 19 to control the angle deflection of the serrated structure 18, so that when extracting crude oil from the oil layer, large air bubbles 20 in the crude oil are broken into small air bubbles 19. The input end of the tooth angle offset mechanism 6 and the drive end of the pumping unit 3 are both connected to the control cabinet 4.

[0036] Specifically, according to Figure 3 and Figure 4As shown, the gas stagnation mechanism 1 includes an outer ring pipe 16 and an inner component 17. The outer ring pipe 16 is sleeved inside the casing assembly and extends vertically along the oil production hole into the oil layer 5. The oil pump 4 is assembled at the outlet end of the outer ring pipe 16. The inner component 17 has an annular pipe structure, wherein the outer side of the inner component 17 is sleeved inside the outer ring pipe 16, and the inner side of the inner component 17 is provided with a serrated structure 18. In this invention, the inner component 17 is made of a malleable material.

[0037] The outer ring tube 16 and the inner component 17 are of equal length, and the two ends of the outer ring tube 16 and the inner component 17 are assembled and fixed. The sawtooth structure 18 is distributed along the long side of the inner component 17 on the inner side of the inner component 17, and is distributed on both sides of the inner wall of the inner component 17.

[0038] The sawtooth structure 18 includes several sawtooth teeth. Each sawtooth tooth is driven to shift an angle on the inner component 17 by a tooth angle shifting mechanism 6. There is no gap between the sawtooth teeth.

[0039] The tooth angle offset mechanism 6 includes a servo motor 21 and a connecting rod 22. The servo motor 21 is mounted on the upper part of the inner component 17, and the drive end of the servo motor 21 is connected to the control cabinet 4. The connecting rod 22 passes through several saw teeth and is connected to the servo motor 21. The servo motor 21 drives the connecting rod 22 and drives several saw teeth to offset their angles.

[0040] Among them, there is a gap between the serrated structures 18 distributed on the two inner sides of the inner component 17, and the gap is a transportation channel for extracting crude oil from the oil layer 5.

[0041] Specifically, the present invention also includes an oil viscosity meter 7 and an oil viscosity acquisition sensor 8. The oil viscosity meter 7 is placed on the ground 2, and the oil viscosity acquisition sensor 8 is installed in the gas stagnation mechanism 1. The output end of the oil viscosity acquisition sensor 8 is connected to the input end of the oil viscosity meter 7, and the output end of the oil viscosity meter 7 is connected to the control cabinet 4.

[0042] Specifically, according to Figure 5 As shown, the control cabinet 4 is equipped with a controller. The input end of the controller is connected to the signal acquisition module, and the output end is connected to the drive module and the human-machine interaction module. The input end of the signal acquisition module is connected to the oil viscosity acquisition sensor 8 via the oil viscosity detector 7. The output end of the drive module is connected to the oil pump 3 and the tooth angle offset mechanism 6. The human-machine interaction module is used to display the detection data.

[0043] Among them, the oil viscosity meter 7 is model KM-VC; the oil viscosity acquisition sensor is model SXB6-FWS-2.

[0044] Specifically, the casing assembly includes several conduits 9, several surface casings 11, several technical casings 12, and several oil layer casings 15. A surface casing cement ring 10, a technical casing cement ring 12, and an oil layer casing cement ring 14 are sequentially arranged along the direction from the production borehole to the oil layer 5. Several conduits 9 are arranged in a ring on the inner wall of the production borehole and are located above the surface casing cement ring 10. Several surface casings 11 are arranged in a ring on the inner wall of the surface casing cement ring 10 and are tightly fitted to the several conduits 9. Several technical casings 12 are arranged in a ring on the inner wall of the technical casing cement ring 12 and are tightly fitted to the several surface casings 11. Several oil layer casings 15 are arranged in a ring inside the oil layer casing cement ring 14 and are tightly fitted to the several technical casings 12. The gas trapping mechanism 1 is fitted inside the ring-arranged oil layer casings 15.

[0045] This invention also provides a method for using a gas retention device for oil fields. Based on the above-described gas retention device for oil fields, the specific process is as follows:

[0046] An oil well is excavated at the ground 2 containing the oil layer 5, and a casing assembly is arranged sequentially from the oil well to the inner wall of the oil layer 5. The gas trapping mechanism 1 is fitted inside the casing assembly and extends vertically along the oil well into the oil layer 5. The oil pump 3 is installed at the outlet end of the gas trapping mechanism 1. The control cabinet 4 drives the oil pump 3 to extract crude oil from the oil layer 5 through the gas trapping mechanism 1. During the extraction of crude oil, there are large air bubbles 20 in the crude oil. The control cabinet 4 controls the angle offset of the sawtooth structure 18 of the gas trapping mechanism 1 through the tooth angle offset mechanism 6 to break the large air bubbles 20 in the crude oil into small air bubbles 19.

[0047] The device of the present invention is adapted to different optimal serration densities for different types of crude oil, such as paraffinic crude oil, naphthenic crude oil and intermediate crude oil. Paraffinic crude oil has a denser serration, naphthenic crude oil has a sparser serration, and intermediate crude oil is in between the two.

[0048] In summary, this invention provides a gas trapping device and its usage method for oilfields. A casing assembly and a gas trapping mechanism are arranged on a surface containing an oil layer. The casing assembly is vertically and annularly installed inside the oil well on the surface, and the gas trapping mechanism is fitted inside the casing assembly, enabling stable oil extraction within the well. An oil pump is installed at the outlet end of the gas trapping mechanism, and the drive end of the oil pump is connected to a control cabinet. The control cabinet drives the oil pump, facilitating the extraction of crude oil from the oil layer through the gas trapping mechanism. The gas trapping mechanism has a serrated structure, and a tooth angle offset mechanism is installed on the serrated structure. The control cabinet drives the tooth angle offset mechanism, causing the angle of the serrated structure to deflect. This breaks large air bubbles in the crude oil into smaller bubbles during extraction, and is applicable to different types of crude oil. It alters the elastic stress distribution around the bubbles to achieve optimal gas trapping effect, reducing the incidence of blowout accidents and improving the safety of oil extraction operations.

[0049] 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 gas holding device for use in an oil field, characterized by, It includes a casing assembly, a gas stagnation mechanism (1), an oil pump (3), and a control cabinet (4); the casing assembly is connected in sequence to form an annular cylindrical structure, the gas stagnation mechanism (1) is sleeved inside the casing assembly, the oil pump (3) is assembled at the outlet end of the gas stagnation mechanism (1), the inner wall of the gas stagnation mechanism (1) is provided with a serrated structure (18) along the pipe body direction, and a tooth angle offset mechanism is assembled on the serrated structure (18) to control the angle deflection of the serrated structure (18), and the tooth angle offset mechanism and the drive end of the oil pump (3) are both connected to the control cabinet (4).

2. The gas retention device for oil fields according to claim 1, characterized in that, The gas stagnation mechanism (1) includes an outer ring pipe (16) and an inner component (17). The outer ring pipe (16) is sleeved inside the casing assembly. The oil pump (3) is assembled at the outlet end of the outer ring pipe (16). The inner component (17) has an annular pipe structure, wherein the outer side of the inner component (17) is sleeved inside the outer ring pipe (16), and the inner side of the inner component (17) is provided with a serrated structure (18).

3. The gas stagnation device for oil fields according to claim 2, characterized in that, The outer ring tube (16) and the inner component (17) are of equal length, and the two ends of the outer ring tube (16) and the inner component (17) are assembled and fixed. The serrated structure (18) is distributed along the long side of the inner component (17) on the inner side, and the serrated structure (18) is distributed on both sides of the inner wall of the inner component (17).

4. The gas stagnation device for oil fields according to claim 3, characterized in that, The sawtooth structure (18) includes a number of sawtooth teeth, each of which is driven to offset an angle on the inner component (17) by a tooth angle offset mechanism.

5. The gas stagnation device for oil fields according to claim 4, characterized in that, The tooth angle offset mechanism (6) includes a servo motor (21) and a connecting rod (22). The servo motor (21) is mounted on the upper part of the inner component (17), and the drive end of the servo motor (21) is connected to the control cabinet (4). The connecting rod (22) passes through several saw teeth and is connected to the servo motor (21). The servo motor (21) drives the connecting rod (22) and drives several saw teeth to offset the angle.

6. The gas stagnation device for oil fields according to claim 4, characterized in that, The serrated structures (18) distributed on the inner two sides of the internal component (17) have gaps between them, and the gaps are transportation channels for extracting crude oil from the oil layer (5).

7. The gas stagnation device for oil fields according to claim 1, characterized in that, It also includes an oil viscosity meter (7) and an oil viscosity acquisition sensor (8). The oil viscosity acquisition sensor (8) is installed in the gas stagnation mechanism (1). The output end of the oil viscosity acquisition sensor (8) is connected to the input end of the oil viscosity meter (7). The output end of the oil viscosity meter (7) is connected to the control cabinet (4).

8. A gas stagnation device for oil fields according to claim 7, characterized in that, The control cabinet (4) is equipped with a controller. The input end of the controller is connected to the signal acquisition module, and the output end is connected to the drive module and the human-machine interaction module. The input end of the signal acquisition module is connected to the oil viscosity acquisition sensor (8) via the oil viscosity detector (7). The output end of the drive module is connected to the oil pump (3) and the tooth angle offset mechanism (6).

9. A gas stagnation device for oil fields according to claim 1, characterized in that, The casing assembly includes several conduits (9), several surface casings (11), several technical casings (12), and several oil layer casings (15); wherein, several conduits (9) are connected in sequence around an outer tube body forming an annular cylindrical structure, several surface casings (11) are connected in sequence around and tightly attached to the inner side of several conduits (9), several technical casings (12) are connected in sequence around and tightly attached to the inner side of several surface casings (11), several oil layer casings (15) are connected in sequence around and tightly attached to the inner side of several technical casings (12), and the gas stagnation mechanism (1) is sleeved inside several oil layer casings (15).

10. A method of using a gas retention device for oil fields, based on the gas retention device for oil fields according to any one of claims 1-9, characterized in that, The specific process is as follows: An oil well is excavated at the ground (2) containing the oil layer (5), and a casing assembly is arranged sequentially from the oil well to the inner wall of the oil layer (5). The gas stagnation mechanism (1) is fitted inside the casing assembly and extends vertically along the oil well into the oil layer (5). The oil pump (3) is installed at the outlet end of the gas stagnation mechanism (1). The control cabinet (4) drives the oil pump (3) to extract crude oil from the oil layer (5) through the gas stagnation mechanism (1). When extracting crude oil, there are large air bubbles (20) in the crude oil. The control cabinet (4) controls the angle offset of the sawtooth structure (18) of the gas stagnation mechanism (1) through the tooth angle offset mechanism (6) to break the large air bubbles (20) in the crude oil into small air bubbles (19), thereby reducing the incidence of blowout accidents.

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