Associated gas condensate recovery device

Abstract

The utility model discloses an associated gas condensate recovery device and aims to solve the technical problem that the associated gas condensate recovery process in the prior art is insufficient in capability of removing liquid carried by associated gas. According to the device, the primary gas-liquid separation unit, the associated gas condensation unit and the secondary gas-liquid separation unit are integrated, the recovery efficiency of associated gas condensate is improved and the energy consumption is reduced through an optimized gas-liquid separation process and an automatic liquid discharge system, and the risk of freezing and blocking of an air cooler is reduced through an optimized design; the amount of liquid carried in the treated associated gas is remarkably reduced, and an innovative solution is provided for the field of recycling of the oilfield associated gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to the oilfield associated gas recovery field, concretely relates to a kind of associated gas condensate recovery device. BACKGROUND

[0002] Oil and gas gathering and transportation is an important part of oilfield surface engineering, and oil and gas separation is one of the key processes in the oil and gas gathering and transportation process. The high gas-oil ratio and high light component content of crude oil in some blocks of oilfields result in a large amount of associated gas production. The gas entrained in the oil needs to be separated before entering the export pump. The associated gas separated from the buffer tank is partly supplied as fuel to the heating furnace and partly exported. By using the gas-liquid separation integrated device, the horizontal oil and gas separation buffer tank, the vertical gas-liquid separator and the air cooler are combined. The associated gas is not completely separated after passing through the buffer tank, is condensed after passing through the air cooler, and is subjected to secondary separation after passing through the gas-liquid separator. The condensed liquid separated finally is deposited at the bottom of the vertical associated gas separator.

[0003] The current commonly used associated gas condensate recovery process is as follows: the condensed liquid is deposited at the bottom of the associated gas separator, the condensed liquid is recovered through a liquid discharge pipe, the upper end of the liquid discharge pipe is connected with the liquid collection plate at the bottom of the associated gas separator, and the lower end is communicated with the drain valve arranged outside the separation buffer tank. The condensed liquid produced is finally discharged into the waste oil tank. However, since the amount of waste discharged from the associated gas separator accounts for 30% to 50% of the total waste discharge in the station, the current condensed liquid recovery process has the problems of long waste discharge process, high energy consumption, frequent start and stop of the waste oil recovery device, the need for heat tracing, frequent freezing and blocking of the air cooler, high associated gas liquid carrying rate, and potential safety and environmental protection risks.

[0004] In view of the current associated gas condensate recovery process, a kind of associated gas condensate recovery device is needed to reduce the associated gas liquid carrying rate and realize the cyclic recovery and utilization of associated gas condensate. The problems of long process and high energy consumption of the existing associated gas condensate recovery process are solved, and the associated gas liquid carrying rate is effectively reduced. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of associated gas condensate recovery device to overcome the technical problem that the associated gas condensate recovery process of prior art has insufficient liquid removal capacity for associated gas.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] An associated gas condensate recovery device is provided in an embodiment of the present application, characterized by comprising a primary gas-liquid separation unit, an associated gas condensation unit and a secondary gas-liquid separation unit.

[0008] The primary gas-liquid separation unit comprises a separation buffer tank for carrying out the first gas-liquid separation of the oil-gas mixture. The separation buffer tank is provided with an oil-gas inlet and a buffer tank gas outlet. The oil-gas inlet is connected to the oil-gas mixture source as the inlet of the oil-gas mixture, allowing the oil-gas mixture to flow into the separation buffer tank for the first gas-liquid separation. The buffer tank gas outlet is connected to the associated gas condensing unit.

[0009] The associated gas condensing unit comprises an air cooler for condensing the separated gas, reducing the gas temperature, and promoting the coalescence of small droplets in the gas into larger droplets to create conditions for subsequent sedimentation. The cooling temperature can be adjusted by adjusting the angle of the louvers. The air cooler is connected to the gas outlet and the secondary gas-liquid separation unit through pipelines.

[0010] The secondary gas-liquid separation unit comprises a vertical associated gas separator for secondary separation of the associated gas to further separate the gas and liquid. The vertical associated gas separator is provided with an associated gas separator inlet connected to the air cooler through a pipeline. The associated gas separator inlet serves as the inlet of the gas condensed in the air cooler into the secondary gas-liquid separation unit. The lower part of the vertical associated gas separator is a condensate collection area that collects the separated droplets and is connected to the separation buffer tank through a liquid discharge pipe. The associated gas separator inlet is a tangential inlet that facilitates the escape of gas from the oil film and the separation of droplets from the gas stream to collect liquid at the bottom of the condensate collection area.

[0011] Further, the liquid discharge pipe is also provided with a liquid discharge control unit to control the flow of condensate in the liquid discharge pipe.

[0012] Further, the liquid discharge pipe is also connected to the bottom of the air cooler.

[0013] Further, the liquid discharge control unit is arranged on the pipeline of the liquid discharge pipe close to the condensate collection area.

[0014] Further, the liquid discharge control unit is an electric valve that controls the discharge of condensate in the condensate collection area.

[0015] Further, the outer side of the vertical associated gas separator is also provided with a liquid level detection unit.

[0016] Further, the liquid level detection unit comprises a liquid level gauge arranged on the outer side of the pipeline wall of the condensate collection area to facilitate monitoring of the liquid level of the condensate collection area.

[0017] Further, the lower end of the liquid discharge pipe extends into the separation buffer tank and is connected to the liquid phase area at the lower part of the separation buffer tank to transport the condensate from the condensate collection area back to the separation buffer tank, avoiding secondary carrying of gas, realizing internal circulation of the condensate, and improving separation efficiency.

[0018] Further, the vertical associated gas separator is provided with a gas outlet above the vertical associated gas separator, and the separated gas is discharged from the vertical associated gas separator into an external pipeline through the gas outlet.

[0019] Further, the oil and gas inlet is arranged on the side of the separation buffer tank, and the buffer tank gas outlet is arranged on the top of the separation buffer tank.

[0020] Compared with the prior art, the present application has the following beneficial technical effects:

[0021] The associated gas condensate recovery device integrates a primary gas-liquid separation unit, an associated gas condensation unit and a secondary gas-liquid separation unit in a compact device, reduces intermediate links and external connections, shortens the recovery process, realizes efficient separation of the oil and gas mixture and recovery of the associated gas condensate, and improves the utilization rate of the associated gas.

[0022] Further, the associated gas condensate recovery device utilizes the linkage of the liquid level meter and the electric valve to realize liquid discharge, reduces oil and gas volatilization and optimizes the pollution discharge process. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a schematic diagram of the overall structure of an associated gas condensate recovery device according to an embodiment of the present application.

[0024] In the figure, 1 is a separation buffer tank, 2 is an oil and gas inlet, 3 is a buffer tank gas outlet, 4 is an air cooler, 5 is a vertical associated gas separator, 6 is an electric valve, 7 is a liquid discharge pipe, 8 is a liquid level meter, 9 is an associated gas separator inlet, 10 is a condensate collection area, and 11 is a gas outlet. DETAILED DESCRIPTION

[0025] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0026] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood in a broad sense, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" is two or more than two, unless otherwise explicitly specified and limited.

[0029] Embodiment 1:

[0030] The embodiment of the present application provides a kind of associated gas condensate recovery device, it is characterized in that, including primary gas-liquid separation unit, associated gas condensing unit, secondary gas-liquid separation unit;

[0031] The primary gas-liquid separation unit comprises a separation buffer tank 1 for primary gas-liquid separation of the oil-gas mixture. The separation buffer tank 1 is provided with an oil-gas inlet 2 and a buffer tank gas outlet 3. The oil-gas inlet 2 is connected to the source of the oil-gas mixture as an inlet for the oil-gas mixture to flow into the separation buffer tank 1 for primary gas-liquid separation. The buffer tank gas outlet 3 is connected to the associated gas condensing unit.

[0032] The associated gas condensing unit comprises an air cooler 4 for condensing the separated gas to reduce the temperature of the gas and promote the coalescence of small droplets in the gas into larger droplets to create conditions for subsequent settling. The cooling temperature can be adjusted by adjusting the angle of the louvers. The air cooler 4 is connected to the gas outlet 3 and the secondary gas-liquid separation unit via pipes.

[0033] The secondary gas-liquid separation unit comprises a vertical associated gas separator 5 for secondary separation of the associated gas to further separate the gas and liquid. The vertical associated gas separator 5 is provided with an associated gas separator inlet 9 connected to the air cooler 4 via a pipe. The associated gas separator inlet 9 is an inlet for the gas condensed in the air cooler 4 to enter the secondary gas-liquid separation unit. The lower part of the vertical associated gas separator 5 is a condensate collection area 10 for collecting the separated droplets. The condensate collection area 10 is connected to the separation buffer tank 1 via a condensate discharge pipe 7. The associated gas separator inlet 9 is a tangential inlet to facilitate the escape of gas from the oil film and the separation of droplets from the gas stream to collect the liquid in the bottom condensate collection area 10.

[0034] Preferably, the condensate discharge pipe 7 in the embodiment is further provided with a condensate discharge control unit to control the flow of condensate in the condensate discharge pipe 7.

[0035] Preferably, the condensate discharge pipe 7 in the embodiment is further connected to the bottom of the air cooler 4.

[0036] Preferably, the condensate discharge control unit in the embodiment is arranged on the pipe of the condensate discharge pipe 7 close to the condensate collection area 10.

[0037] Preferably, the condensate discharge control unit in the embodiment is an electric valve 6 to control the discharge of condensate in the condensate collection area 10.

[0038] Preferably, the outer side of the vertical associated gas separator 5 in the embodiment is further provided with a liquid level detection unit.

[0039] Preferably, the liquid level detection unit in the embodiment comprises a liquid level gauge 8 arranged on the outer side of the pipe wall of the condensate collection area 10 to facilitate monitoring of the liquid level of the condensate collection area 10.

[0040] Preferably, the lower end of the drain pipe 7 in the embodiment extends into the separation buffer tank 1 and communicates with the liquid phase area at the lower part of the separation buffer tank 1, so that the condensate is transported from the condensate collection area 10 back to the separation buffer tank 1, avoiding secondary carrying of gas, realizing internal circulation of the condensate, and improving separation efficiency.

[0041] Preferably, the vertical associated gas separator 5 in the embodiment is arranged above a gas outlet 11, and the separated gas is discharged from the vertical associated gas separator 5 into an external pipeline through the gas outlet 11.

[0042] Preferably, the oil and gas inlet 2 in the embodiment is arranged at the side of the separation buffer tank 1, and the buffer tank gas outlet 3 is arranged at the top of the separation buffer tank 1.

[0043] Embodiment 2:

[0044] The embodiment provides a use scenario of the associated gas condensate recovery device in Embodiment 1.

[0045] The oil and gas mixture first enters the separation buffer tank 1 through the oil and gas inlet 2 to perform preliminary oil and gas separation, wherein the gas is discharged from the buffer tank gas outlet 3 and enters the air cooler 4 to be condensed, so that the temperature of the gas is reduced from 25-30℃ to 5-10℃, and small liquid droplets in the gas are coalesced into larger liquid droplets. Subsequently, the condensed gas enters the vertical associated gas separator 5 to perform secondary gas-liquid separation, and the dry gas after separation is discharged from the vertical associated gas separator 5 through the gas outlet 11 arranged above the vertical associated gas separator 5, while the liquid droplets are accumulated in the condensate collection area 10 at the lower part of the vertical associated gas separator 5. Through the drain pipe 7, the condensate flows back from the condensate collection area 10 to the liquid phase area of the separation buffer tank 1, realizing recycling of the condensate. The liquid level meter 8 continuously monitors the liquid level of the condensate collection area 10, and when the liquid level reaches a set height, the air pressure inside the vertical associated gas separator 5 is greater than the air pressure in the separation buffer tank, at which time the electric valve 6 is automatically opened, so that the condensate flows into the separation buffer tank 1, realizing automatic drainage. The associated gas condensate recovery device has the advantages of simplifying the drainage process, reducing energy consumption, saving electric energy, improving production safety and oilfield benefits, and realizing efficient recovery and recycling of associated gas condensate.

[0046] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the utility model and are not intended to limit the utility model. Without departing from the spirit and scope of the utility model, various changes and improvements can be made to the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A condensate recovery unit for associated gas, characterized in that, The primary gas-liquid separation unit, the associated gas condensing unit and the secondary gas-liquid separation unit are included. The primary gas-liquid separation unit includes a separation buffer tank (1), and an oil-gas inlet (2) and a buffer tank gas outlet (3) are arranged on the separation buffer tank (1), and the buffer tank gas outlet (3) is connected with the associated gas condensing unit. The associated gas condensing unit includes an air cooler (4), and the air cooler (4) is connected with the gas outlet (3) and the secondary gas-liquid separation unit through pipelines. The secondary gas-liquid separation unit includes a vertical associated gas separator (5), and an associated gas separator inlet (9) connected with the air cooler (4) through a pipeline is arranged on the vertical associated gas separator (5), and a condensate collection area (10) is arranged at the lower part of the vertical associated gas separator (5), and the condensate collection area (10) is connected with the separation buffer tank (1) through a liquid discharge pipeline (7).

2. A condensate recovery unit for associated gas according to claim 1, characterized in that, A liquid discharge control unit is further arranged on the liquid discharge pipeline (7).

3. A condensate recovery unit for associated gas according to claim 2, characterised in that, The liquid discharge pipeline (7) is further connected with the bottom of the air cooler (4).

4. A condensate recovery unit for associated gas according to claim 3, characterised in that, The liquid discharge control unit is arranged on the pipeline of the liquid discharge pipeline (7) close to the condensate collection area (10).

5. An associated gas liquid recovery unit as claimed in claim 2, wherein, The liquid discharge control unit is an electric valve (6).

6. An associated gas liquid recovery unit as claimed in claim 1, wherein, A liquid level detection unit is further arranged on the outer side of the vertical associated gas separator (5).

7. A condensate recovery unit for associated gas according to claim 6, characterised in that, The liquid level detection unit includes a liquid level meter (8), and the liquid level meter (8) is arranged on the outer side wall of the condensate collection area (10).

8. A condensate recovery unit for associated gas according to claim 1, characterized in that, The lower end of the liquid discharge pipeline (7) extends into the separation buffer tank (1) and is connected with the liquid phase area at the lower part of the separation buffer tank (1).

9. A condensate recovery unit for associated gas according to claim 1, characterized in that, A gas outlet (11) is arranged above the vertical associated gas separator (5), and gas enters an external pipeline through the gas outlet (11).

10. A non-associated gas condensate recovery unit as claimed in claim 1, wherein, The oil-gas inlet (2) is arranged on the side of the separation buffer tank (1), and the buffer tank gas outlet (3) is arranged on the top of the separation buffer tank (1).

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