Multifunctional integrated heating, throttling and separating device

Abstract

The utility model discloses a multifunctional integrated heating, throttling and separating device, and relates to the technical field of natural gas gathering and transportation, in particular to the multifunctional integrated heating, throttling and separating device which comprises a first pipeline, a double-coil water jacket heater, a gas-liquid separator and a purifier. Gas from a well mouth of a natural gas well is heated from 30 MPa and throttled to 9 MPa through a first-stage heating furnace coil of the double-coil water jacket heating furnace, natural gas is at 20-30 DEG C, then the natural gas is heated from 9 MPa and throttled to be smaller than 5.7 MPa through a second-stage heating coil of the double-coil water jacket heating furnace and conveyed into the gas-liquid separator, mixed media such as the natural gas and the like are subjected to gas-liquid separation in the separator, and the gas-liquid separation is carried out. The separated water phase is subjected to metering throttling till the pressure is smaller than 1.6 MPa and then is conveyed to a produced water tank, the gas phase is divided into two paths, one path serves as fuel gas to enter a double-coil water jacket heating furnace, and the path of fuel gas is firstly heated by the double-coil water jacket heating furnace and then serves as fuel to be conveyed into a combustor after being dehydrated and filtered; one path enters an external conveying pipeline after being metered, and the fuel of the double-coil water jacket heating furnace is supplied by the device.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas gathering and transportation, in particular to a multi-functional integrated heating throttle separation device. Background Technique

[0002] In the initial stage of gas well exploitation in each oil and gas field, the wellhead pressure is relatively high, and the wellhead throttle is required to reduce the pressure to meet the requirements of the downstream gathering and transportation system. During the throttling process of high-pressure natural gas at the wellhead, hydrates are easily formed. To prevent the formation of hydrates, the heating throttle method is generally adopted. The construction period of heating equipment and related supporting facilities at the gas well wellhead is long and cannot be reused, resulting in waste of investment. The existing gas gathering process of the gathering and transportation system is as follows: the technical route is "downhole throttling, inter-well connection, wet gas transportation, single-well continuous metering, normal temperature separation", and in the middle and later stages, the technical route is "inter-well connection, wet gas transportation, single-well continuous metering, normal temperature separation, decentralized pressurization". The problems existing are as follows: First, the water production of natural gas wells is irregular, mostly in the form of slug water, which is easy to form slug flow in the gas transmission pipeline, resulting in an increase in back pressure. Second, the water production volume is large, reducing the effective diameter of the natural gas transmission pipeline, resulting in an increase in back pressure and the formation water cannot be carried out. Third, the pipeline fluctuates along the terrain, and the generation of liquid accumulation reduces the equivalent diameter of the pipeline, and also causes an increase in pipeline pressure drop under the same gas transmission volume. Fourth, due to the large amount of free water contained in the produced gas, the natural gas metering at the well site is inaccurate; at the same time, the real-time metering of the produced water volume cannot be achieved. In the initial stage of gas well exploitation, the pressure is relatively high, and the downhole throttler cannot be put into the wellbore, and the downhole throttling process cannot be adopted, and only the ground heating throttle separation method can be used.

[0003] In the published Chinese patent application, the publication number: CN216406797U, the patent name: unattended wellhead liquid separation device, the operation of the heating furnace is realized through the combustion controller. On the one hand, the pressure of the burner is controlled by the self-use gas pressure regulating valve, and on the other hand, the temperature of the water jacket furnace is controlled by the temperature controller to be stable; in addition, the gas-liquid separation module is independently skidded, equipped with a safety valve and a blow-off pipe to ensure the safe operation of the horizontal gas-liquid separator; the bottom produced water separated by the horizontal gas-liquid separator is discharged into the sewage storage tank for temporary storage, and when a certain tank level is reached, it is transported away by a tanker truck, thus solving a series of problems caused by the water production of natural gas wells. Although the existing technology can solve the above problems, there are certain limitations in the specific implementation process of the existing technology. The heating module, separation module, metering process supporting water jacket heating furnace, separator, flowmeter and other equipment of the existing technology often result in a long process flow, large investment in installation pipelines and equipment; and low work efficiency. Summary of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a multifunctional integrated heating throttling separation device, which solves the problems raised in the above-mentioned background art.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is realized through the following technical solutions: A multifunctional integrated heating throttling separation device, which is used for heating and separating natural gas flowing out of a natural gas wellhead, includes a first pipeline, a double-coil water jacket heating furnace, a gas-liquid separator, and a purifier. The inflow end of the first pipeline is connected to the natural gas transmission pipeline of the natural gas wellhead, and the outflow end of the first pipeline is connected to the inflow end of the first-stage heating furnace coil of the double-coil water jacket heating furnace. A second pipeline is fixedly installed at the outflow end of the first-stage heating furnace coil of the double-coil water jacket heating furnace and the two are connected. The outflow end of the second pipeline is connected to the inflow end of the second-stage heating furnace coil of the double-coil water jacket heating furnace. A third pipeline is fixedly installed at the outflow end of the second-stage heating furnace coil of the double-coil water jacket heating furnace and the two are connected. The outflow end of the third pipeline is connected to the inflow end of the gas-liquid separator; the first gas outflow end of the gas-liquid separator is fixedly installed with a first gas transmission pipeline and the two are connected; the second gas outflow end of the gas-liquid separator is fixedly installed with a second gas transmission pipeline and the two are connected. The outflow end of the second gas transmission pipeline is connected to the double-coil water jacket heating furnace. The outflow end of the double-coil water jacket heating furnace is fixedly installed with a third gas transmission pipeline and the two are connected. The outflow end of the third gas transmission pipeline is connected to one inflow end of the purifier. The gas outflow end of the purifier is fixedly installed with a fourth gas transmission pipeline and the two are connected. The outflow end of the fourth gas transmission pipeline is connected to the gas inflow port of the thermal burner on the double-coil water jacket heating furnace.

[0008] Optionally, it further includes a dryer, and the dryer is arranged on the bypass pipeline of the fourth gas transmission pipeline.

[0009] Optionally, it further includes a fifth gas transmission pipeline. The fifth gas transmission pipeline has two inflow end ports and two outflow end ports. One inflow end of the fifth gas transmission pipeline is connected to the third gas outflow end of the gas-liquid separator, and the other inflow end of the fifth gas transmission pipeline is connected to the second pipeline; one outflow end of the fifth gas transmission pipeline is connected to the other inflow end of the purifier.

[0010] Optionally, the liquid outflow end of the gas-liquid separator is fixedly installed with a water transmission pipeline. A first electric control valve is arranged on the water transmission pipeline. A liquid level control component is arranged on the gas-liquid separator. The liquid level control component is electrically connected to the first electric control valve through a first wire, and the liquid level control component controls the opening degree of the first electric control valve.

[0011] Optionally, a flow meter is arranged on the water transmission pipeline.

[0012] Optionally, an emergency cut-off valve is provided at the inflow end of the primary heating furnace coil of the double-coil water jacket heating furnace, a pressure detection component is provided at the inflow end of the secondary heating furnace coil of the double-coil water jacket heating furnace, and the emergency cut-off valve is electrically connected to the pressure detection component.

[0013] (III) Beneficial effects

[0014] The utility model provides a multifunctional integrated heating throttling and separating device, which has the following beneficial effects:

[0015] The multifunctional integrated heating throttling and separating device adopts integrated technologies such as secondary heating, throttling, separation, and metering. The gas coming from the wellhead of the natural gas well (mixed medium such as natural gas) is heated and throttled from 30 MPa to 9 MPa through the primary heating furnace coil of the double-coil water jacket heating furnace, and the natural gas is at 20 - 30 °C. Then, it is heated and throttled from 9 MPa to <5.7 MPa again through the secondary heating coil of the double-coil water jacket heating furnace and is transported into the gas-liquid separator, where the gas-liquid separation of the natural gas and other mixed media is carried out in the separator. The separated water phase is metered and throttled to <1.6 MPa and then transported to the produced water tank. The gas phase is divided into two paths. One path enters the double-coil water jacket heating furnace as fuel gas. This path of fuel gas is first heated by the double-coil water jacket heating furnace and then sent to the burner as fuel after dehydration and filtration. One path enters the external transmission pipeline after metering. In this multifunctional integrated heating throttling and separating device, the fuel of the double-coil water jacket heating furnace is self-supplied by this device. Compared with the prior art, the overall process flow is short, the pipeline and equipment investment is relatively small, and the working efficiency is high. Description of the drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the pipeline connection structure of the multifunctional integrated heating throttling and separating device of the present utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the third pipeline in the multifunctional integrated heating throttling and separating device of the present utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the first gas transmission pipeline in the multifunctional integrated heating throttling and separating device of the present utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the water transmission pipeline in the multifunctional integrated heating throttling and separating device of the present utility model.

[0021] In the figure: 1. Double-coil water jacket heating furnace; 2. Gas-liquid separator; 3. Purifier; 4. Dryer; 5. First pipeline; 6. Second pipeline; 7. Third pipeline; 8. Water delivery pipeline; 9. First gas transmission pipeline; 10. Second gas transmission pipeline; 11. Third gas transmission pipeline; 12. Fourth gas transmission pipeline; 13. Fifth gas transmission pipeline; 14. Liquid level control component; 15. First electric control valve; 16. Air pressure control component; 17. Second electric control valve; 18. First wire; 19. Second wire. Specific embodiments

[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] Please refer to Figures 1 to 4 , the present utility model provides a technical solution: a multi-functional integrated heating and throttling separation device, which is used for heating and separating the natural gas flowing out of the natural gas wellhead, and includes a first pipeline 5, a double-coil water jacket heating furnace 1, a gas-liquid separator 2, and a purifier 3.

[0025] Among them, the double-coil water jacket heating furnace 1 is used to heat media such as natural gas. The gas-liquid separator 2 is used to separate gas and liquid from media such as natural gas.

[0026] The inlet end of the first pipeline 5 is connected to the natural gas transmission pipeline of the natural gas wellhead, and the outlet end of the first pipeline 5 is connected to the inlet end of the primary heating furnace coil of the double-coil water jacket heating furnace 1. A second pipeline 6 is fixedly installed at the outlet end of the primary heating furnace coil of the double-coil water jacket heating furnace 1 and the two are connected. The outlet end of the second pipeline 6 is connected to the inlet end of the secondary heating furnace coil of the double-coil water jacket heating furnace 1. A third pipeline 7 is fixedly installed at the outlet end of the secondary heating furnace coil of the double-coil water jacket heating furnace 1 and the two are connected. The outlet end of the third pipeline 7 is connected to the inlet end of the gas-liquid separator 2.

[0027] Among them, natural gas and other media flowing out of the natural gas well enter the primary heating furnace coil of the double-coil water jacket heating furnace 1 through the first pipeline 5. The primary heating furnace coil of the double-coil water jacket heating furnace 1 conducts primary heating on the natural gas and other media, so that the natural gas and other media are heated from 30 MPa and throttled to 9 MPa, and the temperature range is between 20 - 30 °C. Subsequently, the natural gas after primary heating flows into the secondary heating furnace coil of the double-coil water jacket heating furnace 1 through the second pipeline 6. The secondary heating furnace coil of the double-coil water jacket heating furnace 1 conducts secondary heating on the natural gas and other media, and the natural gas and other media are heated from 9 MPa and throttled to < 5.7 MPa. The natural gas and other media after secondary heating flow into the gas-liquid separator 2 through the third pipeline 7. The gas-liquid separator 2 conducts gas-liquid separation on the natural gas and other media, and natural gas and water are produced after separation.

[0028] A pressure gauge (PG0101), a thermometer (TG0101), a thermometer (TG0102), and a second electric control valve 17 are respectively arranged on the first pipeline 5. A throttle valve, a thermometer (TG0103), and a pressure gauge (PG0102) are respectively arranged on the second pipeline 6. A throttle valve, a thermometer (TG0105), a pressure gauge (PG0103), and a pressure transmitter (PIT0101) are respectively arranged on the third pipeline 7. A pressure indicating device (PI0101) is arranged on the pressure transmitter (PIT0101). The pressure transmitter (PIT0101) and the pressure indicating device (PI0101) together constitute a pneumatic control component 16. The pneumatic control component 16 is electrically connected to the second electric control valve 17 through a second wire 19. The pneumatic control component 16 controls the opening degree of the second electric control valve 17. The pneumatic control component 16 can also adopt a pressure sensor. The pneumatic control component 16 detects the air pressure in the third pipeline 7 and controls the opening degree of the second electric control valve 17 according to the air pressure intensity, so as to adjust the input flow rate of the first pipeline 5.

[0029] A first gas transmission pipeline 9 is fixedly installed at the first gas outlet end of the gas-liquid separator 2 and the two are connected.

[0030] Among them, the natural gas separated by the gas-liquid separator 2 flows out from the first gas outlet end and is output through the first gas transmission pipeline 9 to the external transmission pipeline. A flowmeter (FIT0101) for measuring the flow rate of natural gas, a pressure gauge (PG0104) for measuring the pipeline pressure, and a thermometer (TG0106) for measuring the temperature of natural gas are respectively arranged on the first gas transmission pipeline 9. A bypass pipe is arranged on the first gas transmission pipeline 9 and in the section where the flowmeter (FIT0101) is located.

[0031] The second gas outlet end of the gas-liquid separator 2 is fixedly installed with and communicated with a second gas transmission pipeline 10. The outlet end of the second gas transmission pipeline 10 is communicated with the double-coil water jacket heating furnace 1. The outlet end of the double-coil water jacket heating furnace 1 is fixedly installed with and communicated with a third gas transmission pipeline 11. The outlet end of the third gas transmission pipeline 11 is communicated with an inlet end of the purifier 3. The gas outlet end of the purifier 3 is fixedly installed with and communicated with a fourth gas transmission pipeline 12. The outlet end of the fourth gas transmission pipeline 12 is communicated with the gas inlet port of the burner on the double-coil water jacket heating furnace 1.

[0032] Among them, the natural gas separated by the gas-liquid separator 2 flows out from the second gas outlet end and is output through the second gas transmission pipeline 10 to the double-coil water jacket heating furnace 1. The natural gas flowing into the double-coil water jacket heating furnace 1 is heated and the temperature rises. The heated natural gas flows into the purifier 3 through the third gas transmission pipeline 11. The purifier 3 is mainly used to remove impurities and harmful substances in the natural gas to ensure the purity and safety of the natural gas. The natural gas flowing out of the purifier 3 flows into the burner of the double-coil water jacket heating furnace 1 through the fourth gas transmission pipeline 12 to provide fuel for the burner of the double-coil water jacket heating furnace 1.

[0033] A control valve for controlling the opening and closing degree of the pipeline is arranged on the second gas transmission pipeline 10. A pressure gauge (PG0105) and a thermometer (TG0107) are respectively arranged on the third gas transmission pipeline 11. A safety valve (PSV0103) and a control valve are respectively arranged on the fourth gas transmission pipeline 12.

[0034] Specifically, the multifunctional integrated heating throttling and separation device further includes a dryer 4, and the dryer 4 is arranged on the bypass pipeline of the fourth gas transmission pipeline 12.

[0035] Among them, a bypass pipeline is arranged on the fourth gas transmission pipeline 12, and the dryer 4 is arranged on the bypass pipeline of the fourth gas transmission pipeline 12. The dryer 4 dehydrates the natural gas to ensure the dryness of the natural gas.

[0036] Specifically, the multifunctional integrated heating throttle separation device further includes a fifth gas transmission pipeline 13. The fifth gas transmission pipeline 13 has two inlet ports and two outlet ports. One inlet of the fifth gas transmission pipeline 13 is communicated with the third gas outlet of the gas-liquid separator 2, and the other inlet of the fifth gas transmission pipeline 13 is communicated with the second pipeline 6. One outlet of the fifth gas transmission pipeline 13 is communicated with the other inlet of the purifier 3.

[0037] Among them, a safety valve (PSV0101) is provided on the pipe wall of one inlet of the fifth gas transmission pipeline 13 close to the gas-liquid separator 2, and a safety valve (PSV0102) is provided on the pipe wall of one inlet of the fifth gas transmission pipeline 13 close to the second pipeline 6. A safety valve (PSV0103) is provided on the pipe wall of one outlet of the fifth gas transmission pipeline 13 close to the purifier 3. The other outlet of the fifth gas transmission pipeline 13 is communicated with the external transmission pipeline. The functions of the fifth gas transmission pipeline 13 are as follows: First, the natural gas produced by the gas-liquid separator 2 flows through the fifth gas transmission pipeline 13 to the external transmission pipeline; Second, the natural gas produced by the gas-liquid separator 2 flows through the fifth gas transmission pipeline 13 to the purifier 3; Third, the natural gas flowing out of the second pipeline 6 flows through the fifth gas transmission pipeline 13 to the external transmission pipeline; The natural gas flowing out of the second pipeline 6 flows through the fifth gas transmission pipeline 13 to the purifier 3. Among them, the natural gas flowing through the fifth gas transmission pipeline 13 to the purifier 3 is used as fuel supply.

[0038] Specifically, a water transmission pipeline 8 is fixedly installed at the liquid outlet of the gas-liquid separator 2. A first electric control valve 15 is provided on the water transmission pipeline 8. A liquid level control component 14 is provided on the gas-liquid separator 2. The liquid level control component 14 is electrically connected to the first electric control valve 15 through a first wire 18. The liquid level control component 14 controls the opening degree of the first electric control valve 15. A flowmeter is provided on the water transmission pipeline 8.

[0039] Among them, the water transmission pipeline 8 is used to discharge the water separated in the gas-liquid separator 2. The liquid level control component 14 is used to detect the water level in the gas-liquid separator 2 and control the opening degree of the first electric control valve 15 according to the water level to meet the drainage needs. The liquid level control component 14 includes a liquid level gauge (LG0101), a liquid level remote transmission instrument (LT0101), and a liquid level regulating instrument (LICA0101). The liquid level gauge (LG0101), the liquid level remote transmission instrument (LT0101), and the liquid level regulating instrument (LICA0101) are electrically connected through wires. A ball valve and a flowmeter (FIT0102) are respectively provided on the water transmission pipeline 8.

[0040] In the specific implementation process, the liquid level control component 14 can also adopt a liquid level sensor.

[0041] Specifically, an emergency cut-off valve is provided at the inflow end of the primary heating furnace coil of the double-coil water jacket heating furnace 1, and a pressure detector is provided at the inflow end of the secondary heating furnace coil of the double-coil water jacket heating furnace 1. The emergency cut-off valve is electrically connected to the pressure detector.

[0042] Among them, the pressure detector adopts an extreme temperature (pressure) safety controller, and the pressure detector is used to detect the pressure of the fluid in the secondary heating furnace coil. When the pressure detector detects that the natural gas pressure downstream of the double-coil water jacket heating furnace 1 (the pipe section where the secondary heating furnace coil is located) exceeds the preset pressure value, the pressure detector controls the emergency cut-off valve to close, and the emergency cut-off valve automatically cuts off the upstream gas supply to ensure the safe operation of the equipment.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A multi-functional integrated heating throttling separation device for heating and separating natural gas flowing out of a natural gas wellhead, characterized in that: It includes a first pipeline (5), a double-coil water jacket heating furnace (1), a gas-liquid separator (2), and a purifier (3); The inflow end of the first pipeline (5) is connected to the natural gas transmission pipeline at the natural gas wellhead. The outflow end of the first pipeline (5) is connected to the inflow end of the first-stage heating furnace coil of the double-coil water jacket heating furnace (1). A second pipeline (6) is fixedly installed and connected to the outflow end of the first-stage heating furnace coil of the double-coil water jacket heating furnace (1). The outflow end of the second pipeline (6) is connected to the inflow end of the second-stage heating furnace coil of the double-coil water jacket heating furnace (1). A third pipeline (7) is fixedly installed and connected to the outflow end of the second-stage heating furnace coil of the double-coil water jacket heating furnace (1). The outflow end of the third pipeline (7) is connected to the inflow end of the gas-liquid separator (2); A first gas transmission pipeline (9) is fixedly installed and connected to the first gas outflow end of the gas-liquid separator (2); A second gas transmission pipeline (10) is fixedly installed and connected to the second gas outflow end of the gas-liquid separator (2). The outflow end of the second gas transmission pipeline (10) is connected to the double-coil water jacket heating furnace (1). A third gas transmission pipeline (11) is fixedly installed and connected to the outflow end of the double-coil water jacket heating furnace (1). The outflow end of the third gas transmission pipeline (11) is connected to one inflow end of the purifier (3). A fourth gas transmission pipeline (12) is fixedly installed and connected to the gas outflow end of the purifier (3). The outflow end of the fourth gas transmission pipeline (12) is connected to the gas inflow port of the hot burner on the double-coil water jacket heating furnace (1).

2. The multi-functional integrated heating throttling separation device according to claim 1, wherein: It further includes a dryer (4), and the dryer (4) is arranged on the bypass pipeline of the fourth gas transmission pipeline (12).

3. The multifunctional integrated heating throttling separation device according to claim 1, characterized in that: It further includes a fifth gas transmission pipeline (13). The fifth gas transmission pipeline (13) has two inflow end ports and two outflow end ports. One inflow end of the fifth gas transmission pipeline (13) is connected to the third gas outflow end of the gas-liquid separator (2), and the other inflow end of the fifth gas transmission pipeline (13) is connected to the second pipeline (6). One outflow end of the fifth gas transmission pipeline (13) is connected to the other inflow end of the purifier (3).

4. The multi-functional integrated heating throttling separation device according to claim 1, characterized in that: A water transmission pipeline (8) is fixedly installed at the liquid outflow end of the gas-liquid separator (2). A first electric control valve (15) is arranged on the water transmission pipeline (8). A liquid level control assembly (14) is arranged on the gas-liquid separator (2). The liquid level control assembly (14) is electrically connected to the first electric control valve (15) through a first wire (18), and the liquid level control assembly (14) controls the opening degree of the first electric control valve (15).

5. The multi-functional integrated heating throttling and separation device according to claim 4, characterized in that: A flowmeter is arranged on the water transmission pipeline (8).

6. The multifunctional integrated heating throttling separation device according to claim 1, characterized in that: An emergency cut-off valve is arranged at the inflow end of the first-stage heating furnace coil of the double-coil water jacket heating furnace (1). A pressure detection component is arranged at the inflow end of the second-stage heating furnace coil of the double-coil water jacket heating furnace (1). The emergency cut-off valve is electrically connected to the pressure detection component.

Images