CN113755220B

CN113755220B - Oil-gas separation recovery unit for natural gas field

Info

Publication number: CN113755220B
Application number: CN202111142914.8A
Authority: CN
Inventors: 海连富; 陶瑞; 母彩霞; 何伟; 宋扬; 王磊; 白金鹤; 梅超; 马治军
Original assignee: Ningxia Mineral Institute Of Geological Survey
Current assignee: Ningxia Mineral Institute Of Geological Survey
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-05-20
Anticipated expiration: 2041-09-28
Also published as: CN113755220A

Abstract

The invention relates to the field of natural gas purification, in particular to an oil-gas separation and recovery device for a natural gas field, which comprises a separation box, an oil-gas separation component, a gas recovery component and an oil recovery component, wherein the oil-gas separation component comprises a wire mesh demister and a fixed plate; the outer side wall of the fixed plate is fixedly connected with the inner wall of the gas cavity; the outer edge of the silk screen demister is fixedly connected with a frame, the top of the frame is fixedly connected with a guide rod, and the guide rod is movably inserted in the linear bearing seat. According to the invention, the frame is arranged outside the screen foam remover, the fixed plate is arranged inside the separation box, the frame is connected with the fixed plate through the guide rod and the linear bearing seat, the floating plate is arranged at the bottom of the frame through the support, and when the oil level rises, the screen foam remover can float through the floating plate, so that a certain distance exists between the screen foam remover and the liquid level, the condition that the screen foam remover is immersed due to the rising of the liquid level is avoided, and the foam removing effect of the screen foam remover is improved.

Description

Oil-gas separation recovery unit for natural gas field

Technical Field

The invention belongs to the field of natural gas purification, and particularly relates to an oil-gas separation and recovery device for a natural gas field.

Background

Natural gas is a gaseous fossil fuel mainly composed of methane, which is mainly present in oil fields and natural gas fields, and a small amount of natural gas exists in coal seams, and the natural gas is also buried in underground closed geological structures like crude oil, some natural gas and crude oil are stored in the same layer, and some natural gas and crude oil are independently stored, and the natural gas stored in the same layer with the crude oil can be produced together with the crude oil, and the natural gas is mainly used as fuel, can be used for producing carbon black, chemicals and liquefied petroleum gas, and propane and butane produced by the natural gas are important raw materials in modern industry. Pure natural gas is more thoroughly and cleanly combusted, and collected natural gas is mostly mixed with crude oil and can be used only by carrying out oil-gas separation.

A wire mesh demister is a common component in oil-gas separation equipment, and entrained mist can be removed by passing gas through a wire mat of the demister. Not only can filter out larger liquid foam suspended in the air flow, but also can filter out smaller and tiny liquid foam. However, most of the existing wire mesh defoamers are fixedly installed, the position of the existing wire mesh defoamers is not convenient to change according to the liquid level of oil, the existing wire mesh defoamers are easily immersed when the liquid level rises, and the defoaming effect is further influenced.

Disclosure of Invention

In order to solve the problems, the invention provides an oil-gas separation and recovery device for a natural gas field, which comprises a separation box, an oil-gas separation component, a gas recovery component and an oil recovery component, wherein the oil-gas separation component is positioned in the separation box and divides the upper end and the lower end of the separation box into a gas cavity and an oil cavity, and the gas cavity and the oil cavity are respectively communicated with the gas recovery component and the oil recovery component;

the oil-gas separation component comprises a wire mesh demister and a fixing plate; the outer side wall of the fixed plate is fixedly connected to the inner wall of the gas cavity, and a linear bearing seat is arranged in the fixed plate; the outer edge of the wire mesh demister is fixedly connected with a frame, the top of the frame is fixedly connected with a guide rod, and the guide rod is movably inserted into the linear bearing seat;

the bottom of the frame is provided with a bracket; the support comprises a connecting rod and a mounting plate, the top of the mounting plate is fixedly connected with one end of the connecting rod, and the other end of the connecting rod is fixedly connected to the bottom of the frame; the bottom of the mounting plate is provided with a floating plate; the floating plate and the wire mesh demister are concentrically arranged;

the outer edge of the frame is provided with an O-shaped groove, an O-shaped ring is sleeved inside the O-shaped groove, and the surface of the O-shaped ring is movably connected with the inner wall of the separation box.

Further, the inside of the oil liquid cavity is communicated with a liquid injection pipe, a liquid outlet of the liquid injection pipe is communicated with a dispersion box, and a dispersion assembly is installed inside the dispersion box;

the dispersion assembly comprises an impact head and a dispersion plate; the impact head is positioned at the inner side of the dispersion plate, and the dispersion plate is positioned at a liquid outlet close to the dispersion box.

Furthermore, a fixed rod is fixedly connected to the outside of the impact head, and the end part of the fixed rod is fixedly connected to the inner wall of the dispersion box; the impact head and the dispersion box are coaxially arranged; the impact head is set to be in a conical structure, and the conical end of the impact head faces the dispersion box.

Further, the dispersion plate is fixedly connected to the outer part of the rotating shaft; the two ends of the rotating shaft are rotatably arranged in the sleeve through bearings, and the end part of the sleeve is fixedly connected to the inner wall of the dispersion box; and the axis of the rotating shaft is vertical to the axis of the dispersion box.

Further, the gas recovery assembly comprises a coil pipe, an air suction pump and a cooling piece; two ends of the coil are respectively communicated with the gas cavity and the air pump, and the cooling piece is arranged on the coil; the cooling piece comprises a refrigeration plate and fins, the fins are embedded in the coil, and the refrigeration plate is mounted at the end parts of the fins.

Furthermore, the oil liquid recovery assembly comprises an oil liquid recovery box and a filtering assembly, the filtering assembly is positioned inside the oil liquid recovery box, and the filtering assembly divides the inner side of the oil liquid recovery box into an oil storage cavity and an oil filtering cavity; the oil filter is characterized in that the inside of the oil storage cavity is communicated with the oil cavity through an oil return pipe, and the oil filter cavity is communicated with an oil pump through an oil pipe.

Further, the filter assembly comprises a filter screen and a scrubbing brush; the filter screen is vertically installed in the oil recovery box, and the scrubbing brush is movably connected to the surface of the filter screen.

Furthermore, the scrubbing brush is arranged at the end part of the rotating rod through an elastic component, and one end of the rotating rod is rotatably arranged on the inner wall of the oil storage cavity through a bearing seat; the outside fixedly connected with impeller of bull stick, the impeller is located the below of returning oil pipe.

Further, the elastic component comprises a clamping plate, a ball head rod and a compression spring; the clamping plate is fixedly connected to one end of the rotating rod, a through hole matched with the ball head rod is formed in the clamping plate, the scrubbing brush is installed at the end portion of the ball head rod, the compression spring is sleeved outside the ball head rod, and the compression spring is located between the clamping plate and the scrubbing brush.

The invention has the beneficial effects that:

1. according to the invention, the frame is arranged outside the screen foam remover, the fixed plate is arranged inside the separation box, the frame is connected with the fixed plate through the guide rod and the linear bearing seat, the floating plate is arranged at the bottom of the frame through the bracket, and when the oil level rises, the screen foam remover can float through the floating plate, so that a certain distance exists between the screen foam remover and the liquid level, the condition that the screen foam remover is immersed due to the rise of the liquid level is avoided, and the foam removing effect of the screen foam remover is improved;

2. the oil-gas separation and recovery device provided by the invention mainly comprises a separation box, an oil-gas separation component, a gas recovery component and an oil recovery component, wherein raw oil is subjected to oil-gas separation in the separation box, and gas and oil are respectively collected through the gas recovery component and the oil recovery component, so that the separation work can be continuously carried out, and the gas and oil collection efficiency is improved;

3. according to the gas recovery assembly provided by the invention, the recovered natural gas can be cooled in the recovery process, so that the water content in the natural gas is reduced, and the cleanness of the natural gas is improved; the oil recovery assembly can filter and remove impurities from the separated oil, so that the cleanness of the oil is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an oil-gas separation and recovery device according to an embodiment of the invention;

FIG. 2 is a schematic sectional view showing a separation tank according to an embodiment of the present invention;

FIG. 3 shows a schematic structural view of a stent according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a dispersion box according to an embodiment of the present invention;

FIG. 5 shows a schematic structural view of a gas recovery assembly in accordance with an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating a structure of an oil recovery assembly according to an embodiment of the present invention;

fig. 7 shows a schematic structural view of a spring assembly according to an embodiment of the present invention.

In the figure: 1. a separation box; 2. an oil-gas separation assembly; 3. a gas recovery assembly; 4. an oil liquid recovery assembly; 5. a wire mesh demister; 6. a fixing plate; 7. a frame; 8. a guide bar; 9. a linear bearing seat; 10. a support; 11. a connecting rod; 12. mounting a plate; 13. a floating plate; 14. an O-shaped groove; 15. an O-shaped ring; 16. a liquid injection pipe; 17. a dispersion box; 18. an impact head; 19. a dispersion plate; 20. fixing the rod; 21. a rotating shaft; 22. a coil pipe; 23. an air pump; 24. a refrigeration plate; 25. a fin; 26. an oil recovery tank; 27. an oil storage chamber; 28. an oil filtering cavity; 29. an oil pump; 30. a filter screen; 31. scrubbing and brushing; 32. a rotating rod; 33. an impeller; 34. a splint; 35. a ball-head rod; 36. a compression spring; 37. a through hole; 38. a sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides an oil-gas separation and recovery device for a natural gas field, which comprises a separation tank 1, an oil-gas separation component 2, a gas recovery component 3 and an oil recovery component 4. The separation box 1 is of a cylindrical structure, and cylinder covers are arranged at the upper end and the lower end of the separation box; the oil return pipe is communicated with the lower cylinder cover, and the coil pipe 22 is communicated with the upper cylinder cover, so that the device is convenient to open for equipment maintenance. The oil-gas separation component 2 is located inside the separation box 1, the upper end and the lower end of the separation box 1 are separated into a gas cavity and an oil cavity by the oil-gas separation component 2, the gas cavity and the oil cavity are respectively communicated with a gas recovery component 3 and an oil recovery component 4, and the gas cavity is used for storing natural gas and oil and is used for storing oil in the oil cavity.

As shown in fig. 2, the oil-gas separation module 2 includes a wire mesh demister 5 and a fixed plate 6. The outer side wall of the fixing plate 6 is fixedly connected to the inner wall of the gas cavity, and a linear bearing seat 9 is installed inside the fixing plate 6. The outer edge of the wire mesh demister 5 is fixedly connected with a frame 7, and the frame 7 is arranged into a circular ring structure matched with the separation box 1; the top of the frame 7 is fixedly connected with a guide rod 8, and the guide rod 8 is movably inserted into a linear bearing seat 9. The guide rod 8 can be moved up and down in the linear bearing block 9 so that the wire mesh demister 5 can be moved up and down in the separation tank 1. The upper end of the guide rod 8 is provided with a limiting block to prevent the guide rod from falling off.

As shown in fig. 3, a bracket 10 is arranged at the bottom of the frame 7; the bracket 10 includes a connecting rod 11 and a mounting plate 12. The top of mounting panel 12 and the one end fixed connection of connecting rod 11, connecting rod 11 sets up the multiunit, and it inclines to the center department slope installation of silk screen demister 5. The size of the mounting plate 12 is one third of that of the wire mesh demister 5, so that the phenomenon that the defoaming is influenced due to the overlarge size of the mounting plate can be avoided. The other end of the connecting rod 11 is fixedly connected to the bottom of the frame 7; the bottom of the mounting plate 12 is provided with a floating plate 13; and the floating plate 13 is concentrically arranged with the wire mesh demister 5. After the stock solution enters the separation tank 1, the oil falls into the oil chamber, and the natural gas enters the gas chamber through the wire mesh demister 5. When the oil liquid level rises in the separation box 1, the wire mesh demister 5 can float upwards through the floating plate 13, so that a certain distance exists between the wire mesh demister 5 and the liquid level, the condition that the wire mesh demister 5 is immersed due to the rise of the liquid level is avoided, and the defoaming effect of the wire mesh demister 5 is improved. When the liquid level descends, the wire mesh demister 5 naturally falls under the action of gravity.

As shown in fig. 3, an O-shaped groove 14 is formed in an outer edge of the frame 7, an O-shaped ring 15 is sleeved inside the O-shaped groove 14, and a surface of the O-shaped ring 15 is movably connected with an inner wall of the separation tank 1. Through the setting of O type circle 15, can avoid fluid to pass through the clearance splash between frame 7 and the separator box 1, O type circle 15 can the separation clearance, receives the lubricated effect of oil simultaneously, can reduce the frictional force between O type circle 15 and the separator box 1.

As shown in fig. 4, the inside of the oil liquid chamber is communicated with a liquid injection pipe 16, the liquid outlet of the liquid injection pipe 16 is communicated with a dispersion box 17, a dispersion component is installed inside the dispersion box 17, the raw liquid enters the separation box 1 through the liquid injection pipe 16 and the dispersion box 17, and the raw liquid is dispersed through the dispersion box 17 in the conveying process, so that the oil-gas separation efficiency can be improved.

As shown in fig. 4, the dispersing assembly includes an impact head 18 and a dispersing plate 19. The impact head 18 is located at the inner side of the dispersion plate 19, and the dispersion plate 19 is located at the liquid outlet close to the dispersion tank 17. The outside of the impact head 18 is fixedly connected with a fixing rod 20, the end part of the fixing rod 20 is fixedly connected with the inner wall of the dispersion box 17, and the diameter of the impact head 18 is one half of that of the dispersion box 17. The impact head 18 and the dispersion box 17 are coaxially arranged; the impact head 18 is provided in a conical configuration with the conical end of the impact head 18 facing the dispersion box 17. When the stock solution is transported, the impact head 18 is impacted to perform the first dispersion, and the dispersed oil is impacted on the dispersion plate 19 to perform the second dispersion.

As shown in fig. 4, the dispersing plates 19 are fixedly connected to the outside of the rotating shaft 21, and at least four groups of dispersing plates 19 are provided and uniformly distributed on the outside of the rotating shaft 21. Both ends of the rotating shaft 21 are rotatably mounted inside a sleeve 38 through bearings, and the end part of the sleeve 38 is fixedly connected to the inner wall of the dispersion box 17; and the axis of the rotating shaft 21 is perpendicular to the axis of the dispersion box 17. Stock solution strikes dispersion board 19, drives dispersion board 19 and rotates for stock solution further disperses, can improve oil-gas separation efficiency greatly.

As shown in fig. 5, the gas recovery module 3 includes a coil 22, a pump 23 and a cooling member. The two ends of the coil 22 are respectively communicated with the gas cavity and the air suction pump 23, the cooling part is arranged on the coil 22, the bottom of the coil 22 is provided with a drain pipe with a valve, and the valve is opened to drain water according to actual needs. The cooling piece comprises a refrigeration plate 24 and fins 25, the fins 25 are embedded in the coil 22, and the refrigeration plate 24 is mounted at the end parts of the fins 25. Refrigeration board 24 cools down fin 25, and when the natural gas of isolating was taken out via aspiration pump 23, the contact of fin 25 after natural gas and the cooling can cool off the natural gas, separates the moisture in the natural gas, reduces the moisture content in the natural gas, improves the clean nature of natural gas.

As shown in fig. 6, the oil recovery unit 4 includes an oil recovery tank 26 and a filter unit. The filter assembly is located inside the oil recovery tank 26, the filter assembly separates the inner side of the oil recovery tank 26 into an oil storage chamber 27 and an oil filtering chamber 28, and oil separated from the oil storage chamber flows into the oil storage chamber 27 through an oil return pipe. The inside of the oil storage cavity 27 is communicated with the oil cavity through an oil return pipe, and a drain pipe of the valve is connected to the oil storage cavity 27, so that crude oil can be conveniently discharged. The oil filtering chamber 28 is communicated with an oil pump 29 through an oil pipe, and the oil pump can pump the filtered essential oil out of the oil recovery tank 26.

As shown in fig. 6, the filter assembly includes a filter screen 30 and a scrubber 31; the filter screen 30 is vertically installed inside the oil recovery tank 26, and the scrubbing brush 31 is movably connected to the surface of the filter screen 30. The filter screen 30 filters impurities in the crude oil. The scrubbing brush 31 is arranged at the end part of the rotating rod 32 through an elastic component, and one end of the rotating rod 32 is rotatably arranged on the inner wall of the oil storage cavity 27 through a bearing seat; an impeller 33 is fixedly connected to the outside of the rotating rod 32, and the impeller 33 is located below the oil return pipe. When fluid flows into in the oil storage chamber 27 via returning oil pipe, fluid strikes impeller 33 to drive bull stick 32, scrubbing brush 31 and rotate, make scrubbing brush 31 can be continuous go on clearing up filter screen 30, reduce filter screen 30's jam.

As shown in fig. 7, the elastic assembly includes a clamp plate 34, a ball bar 35, and a compression spring 36. The clamping plate 34 is fixedly connected to one end of the rotating rod 32, a through hole 37 matched with the ball head rod 35 is formed in the clamping plate 34, the end portion of the ball head rod 35, where the scrubbing brush 31 is installed, is sleeved on the outer portion of the ball head rod 35, and the compression spring 36 is located between the clamping plate 34 and the scrubbing brush 31. In a normal state, the scrubbing brush 31 is tightly attached to the surface of the filter screen 30 under the pressure of the compression spring 36, so that the cleaning efficiency of the scrubbing brush 31 on the filter screen 30 can be improved, separated oil can be filtered and purified, and the cleanliness of the oil is improved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The oil-gas separation and recovery device for the natural gas field is characterized by comprising a separation box (1), an oil-gas separation component (2), a gas recovery component (3) and an oil recovery component (4), wherein the oil-gas separation component (2) is located inside the separation box (1), the upper end and the lower end of the separation box (1) are divided into a gas cavity and an oil cavity by the oil-gas separation component (2), and the gas cavity and the oil cavity are respectively communicated with the gas recovery component (3) and the oil recovery component (4);

the oil-gas separation assembly (2) comprises a wire mesh demister (5) and a fixing plate (6); the outer side wall of the fixed plate (6) is fixedly connected to the inner wall of the gas cavity, and a linear bearing seat (9) is installed inside the fixed plate (6); the outer edge of the wire mesh demister (5) is fixedly connected with a frame (7), the top of the frame (7) is fixedly connected with a guide rod (8), and the guide rod (8) is movably inserted into a linear bearing seat (9);

a bracket (10) is arranged at the bottom of the frame (7); the support (10) comprises a connecting rod (11) and a mounting plate (12), the top of the mounting plate (12) is fixedly connected with one end of the connecting rod (11), and the other end of the connecting rod (11) is fixedly connected to the bottom of the frame (7); the bottom of the mounting plate (12) is provided with a floating plate (13); the floating plate (13) and the wire mesh demister (5) are concentrically arranged;

an O-shaped groove (14) is formed in the outer edge of the frame (7), an O-shaped ring (15) is sleeved inside the O-shaped groove (14), and the surface of the O-shaped ring (15) is movably connected with the inner wall of the separation box (1);

the oil-water separator is characterized in that a liquid injection pipe (16) is communicated with the inside of the oil liquid cavity, a liquid outlet of the liquid injection pipe (16) is communicated with a dispersion box (17), and a dispersion assembly is arranged inside the dispersion box (17);

the dispersion assembly comprises an impact head (18) and a dispersion plate (19); the impact head (18) is positioned at the inner side of the dispersion plate (19), and the dispersion plate (19) is positioned at a liquid outlet close to the dispersion box (17).

2. The oil-gas separation and recovery device for the natural gas field as claimed in claim 1, wherein a fixing rod (20) is fixedly connected to the outside of the impact head (18), and the end of the fixing rod (20) is fixedly connected to the inner wall of the dispersion tank (17); the impact head (18) and the dispersion box (17) are coaxially arranged; the impact head (18) is arranged in a conical structure, and the conical end of the impact head (18) faces the dispersion box (17).

3. The oil-gas separation and recovery device for a natural gas field according to claim 2, wherein the dispersion plate (19) is fixedly connected to the outside of the rotating shaft (21); both ends of the rotating shaft (21) are rotatably arranged in the sleeve (38) through bearings, and the end part of the sleeve (38) is fixedly connected to the inner wall of the dispersion box (17); and the axis of the rotating shaft (21) is vertical to the axis of the dispersion box (17).

4. The oil-gas separation and recovery device for the natural gas field according to claim 1, wherein the gas recovery assembly (3) comprises a coil pipe (22), an air pump (23) and a cooling piece; two ends of the coil pipe (22) are respectively communicated with the gas cavity and the air suction pump (23), and the cooling part is arranged on the coil pipe (22); the cooling piece comprises a refrigeration plate (24) and fins (25), the fins (25) are embedded in the coil (22), and the refrigeration plate (24) is installed at the end parts of the fins (25).

5. The oil-gas separation and recovery device for the natural gas field as defined in claim 1, wherein the oil recovery unit (4) comprises an oil recovery tank (26) and a filter unit, the filter unit is located inside the oil recovery tank (26), and the filter unit divides the inside of the oil recovery tank (26) into an oil storage chamber (27) and an oil filter chamber (28); the oil filter is characterized in that the interior of the oil storage cavity (27) is communicated with the oil cavity through an oil return pipe, and the oil filter cavity (28) is communicated with an oil pump (29) through an oil pipe.

6. The oil-gas separation and recovery device for the natural gas field according to claim 5, wherein the filter assembly comprises a filter screen (30) and a scrubber (31); the filter screen (30) is vertically arranged in the oil liquid recovery box (26), and the scrubbing brush (31) is movably connected to the surface of the filter screen (30).

7. The oil-gas separation and recovery device for the natural gas field as defined in claim 6, wherein the scrubbing brush (31) is mounted at the end of a rotating rod (32) through an elastic component, and one end of the rotating rod (32) is rotatably mounted on the inner wall of the oil storage cavity (27) through a bearing seat; the outside fixedly connected with impeller (33) of bull stick (32), impeller (33) are located the below of returning oil pipe.

8. The oil-gas separation and recovery device for natural gas fields according to claim 7, wherein the elastic assembly comprises a clamping plate (34), a ball head rod (35) and a compression spring (36); splint (34) fixed connection is in the one end of bull stick (32), offer on splint (34) with bulb pole (35) assorted through-hole (37), bulb pole (35) tip that scrubbing brush (31) were installed, compression spring (36) cup joint in the outside of bulb pole (35), compression spring (36) are located between splint (34) and scrubbing brush (31).