阅读说明：本技术 一种天然气井高压集气站的节流加热系统及方法 (Throttling heating system and method for high-pressure gas gathering station of natural gas well ) 是由 程世东 李永清 李永长 陈荣环 李珍 张彬 李丽 操红梅 李曙华 于 2020-11-25 设计创作，主要内容包括：本发明提供一种天然气井高压集气站的节流加热系统及方法,该系统包括进站总机关、供电设备和叶轮膨胀机,所述进站总机关的一端通过进气管线连接有一个或至少两个并联设置的天然气单井,进站总机关的另一端通过出气管线与叶轮膨胀机连通,所述出气管线上设置有电加热装置。叶轮膨胀机与供电设备相连,供电设备为电伴热带供电,电伴热带通过出气管线与天然气进行热交换,完成气体的压力能转换为气体的热能。本发明原理简单、配件少、成本低、维护工作量低、占地面积小,特别适合多井高压常温集气工艺,可实现集气站内对天然气进行节流降压及加热功能,满足高压集气工艺要求,降低集气过程中能量消耗及运行成本。(The invention provides a throttling heating system and a throttling heating method for a high-pressure gas gathering station of a natural gas well. The impeller expander is connected with power supply equipment, the power supply equipment supplies power to the electric tracing band, and the electric tracing band exchanges heat with natural gas through the gas outlet pipeline to convert pressure energy of the gas into heat energy of the gas. The invention has simple principle, few accessories, low cost, low maintenance workload and small occupied area, is particularly suitable for a multi-well high-pressure normal-temperature gas collection process, can realize the functions of throttling, depressurizing and heating natural gas in a gas collection station, meets the requirements of the high-pressure gas collection process, and reduces the energy consumption and the operation cost in the gas collection process.)

1. A throttle heating system of natural gas well high pressure gas gathering station which characterized in that: comprises a station entry master (1), a power supply device (3) and an impeller expander (4);

one end of the station entry main engine (1) is connected with one or at least two natural gas single wells (5) which are arranged in parallel through an air inlet pipeline, the other end of the station entry main engine (1) is communicated with the impeller expander (4) through an air outlet pipeline, and an electric heating device (2) is arranged on the air outlet pipeline;

the electric heating device (2) and the impeller expander (4) are respectively connected with a power supply device (3).

2. The throttling heating system for the high-pressure gas gathering station of the natural gas well as the claim 1 is characterized in that: the power supply equipment (3) comprises a generator and a storage battery pack, the impeller expander (4) is connected with the generator, the generator generates electricity and stores the electricity into the storage battery pack, and the storage battery pack is electrically connected with the electric heating device (2).

3. The throttling heating system of the high-pressure gas gathering station of the natural gas well as the claim 2 is characterized in that: the generator is coaxially connected with the impeller expander (4).

4. The throttling heating system for the high-pressure gas gathering station of the natural gas well as the claim 1 is characterized in that: the electric heating device (2) is an electric tracing band.

5. The throttling heating system of the high-pressure gas gathering station of the natural gas well as the claim 4 is characterized in that: the electric tracing band is wound on the outer wall of the gas outlet pipeline along the length direction of the gas outlet pipeline.

6. The throttling heating system of the high-pressure gas gathering station of the natural gas well as the claim 4 is characterized in that: the electric tracing band is made of conductive plastic materials, and after the conductive plastic is connected with a power supply, current flows from one wire core to the other wire core through the conductive plastic to form a loop.

7. A throttling heating method for a natural gas well high-pressure gas gathering station, which at least comprises the throttling heating system for the natural gas well high-pressure gas gathering station as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:

s1, high-pressure gas enters an entry main organ (1) of the gas gathering station from the natural gas single well (5) through a gas inlet pipeline, and enters a gas outlet pipeline after being collected by the entry main organ (1);

s2, turning on the power supply equipment (3) to supply power to the electric heating device (2), and heating the air outlet pipeline after the electric heating device (2) is electrified;

s3, the heated gas enters the impeller expander (4) to drive the impeller expander (4) to rotate;

and S4, treating the gas flowing out of the nozzle of the impeller expander (4) by a gas treatment process and finishing output.

8. The throttling heating method of the multi-well high-pressure gas gathering station as claimed in claim 1, wherein: the high-pressure gas in the S1 has the pressure of more than 6.4 MPa.

9. The throttling heating method of the multi-well high-pressure gas gathering station as claimed in claim 1, wherein: in the step S3, the heated gas enters the impeller expander (4) to drive the impeller expander (4) to rotate, a generator coaxial with the impeller expander (4) is driven to rotate to generate power and store the electric energy into a storage battery pack, one part of the electric energy of the storage battery pack is used for heating an air outlet pipeline by the electric heating device (2) in front of the impeller expander (4), and the other part of the electric energy is supplied to other electric power equipment in the station.

Technical Field

The invention relates to the field of natural gas gathering and transportation, in particular to a throttling heating system and method for a high-pressure gas gathering station of a natural gas well.

Background

In the production process of natural gas, the wellhead pressure is very high and can generally reach 20 MPa-70 MPa, and the wellhead pressure of individual gas wells is even up to more than 100 MPa. The temperature of the natural gas is greatly reduced in the production process, the natural gas is close to normal temperature, and the pressure is reduced to a certain degree. However, the reduction range of the saturated water content caused by the temperature reduction is far larger than the increase range of the water content caused by the pressure reduction, and the final result of the temperature reduction and the pressure reduction is that condensed water is separated out of the natural gas in the production process and is brought out of the ground by the airflow flowing at high speed. The presence of liquid phase water provides conditions for corrosion to occur. In the process of reducing the temperature, the natural gas and water can form ice-snow-shaped hydrate at normal temperature, so that a gas flow channel is blocked, and the continuous operation of gathering and transportation production is influenced.

Generally, the pressure of a gas field gathering and transportation pipe network can be divided into a high pressure, a medium pressure and a low pressure.

In a certain gas field of the Changqing gas area, the well mouth natural gas is not heated and throttled, the high-pressure natural gas directly enters the gas collecting station, the highest operating pressure of a gas production line is 25MPa, and the highest operating pressure of a gas collecting branch line is 6.0 MPa. Therefore, a gas collecting station (which is a place for collecting, regulating, separating, metering and other operations on gas well natural gas) is adopted to perform multi-well heating throttling, the pressure is reduced to 6.2MPa, a 'Jingbian mode' which takes 'high-pressure gas collection, centralized alcohol injection, multi-well heating, intermittent metering, small-station dehydration and centralized purification' as main technologies is formed, and the mode process is successful and remarkable in effect from the application condition; but from an energy utilization point of view, this approach is clearly unreasonable: firstly, after the high-pressure natural gas is depressurized by a throttle valve in the gas gathering station, high-pressure energy is not fully utilized but wasted on the throttle valve; secondly, in order to keep the gas flowing temperature above the generation temperature of the hydrate, the natural gas in front of the throttle valve needs to be heated, and extra energy needs to be consumed.

In recent years, the natural gas pipeline transportation pressure is getting higher and higher from the world. The pressure of the natural gas pipe network is far higher than the pressure required by users, and a large amount of pressure energy is stored in the natural gas pipe network. Therefore, a station internal throttling heating production process capable of utilizing the self energy of high-pressure gas to realize high-pressure natural gas is needed to reduce the operation cost and achieve the purposes of energy conservation and consumption reduction.

Disclosure of Invention

In order to solve the problems and the defects in the prior art, the invention provides a throttling heating system and a throttling heating method for a high-pressure gas gathering station of a natural gas well.

The technical scheme adopted by the invention is as follows:

a throttling heating system of a high-pressure gas gathering station of a natural gas well comprises a station entering main mechanism, power supply equipment and an impeller expansion machine;

one end of the station entering main mechanism is connected with one or at least two natural gas single wells which are arranged in parallel through an air inlet pipeline, the other end of the station entering main mechanism is communicated with the impeller expansion machine through an air outlet pipeline, and an electric heating device is arranged on the air outlet pipeline;

the electric heating device and the impeller expander are respectively connected with power supply equipment.

The power supply equipment comprises a generator and a storage battery pack, the impeller expander is connected with the generator, the generator generates electricity and stores the electricity into the storage battery pack, and the storage battery pack is electrically connected with the electric heating device.

Further, the generator is coaxially connected with the impeller expander.

Further, the electric heating device is an electric tracing band.

Specifically, the electric tracing band is wound on the outer wall of the air outlet pipeline along the length direction of the air outlet pipeline.

Furthermore, the electric tracing band is made of conductive plastic materials, and after the conductive plastic is connected with a power supply, current flows from one wire core to the other wire core through the conductive plastic to form a loop.

A throttling heating method for a high-pressure gas gathering station of a natural gas well comprises the following steps:

s1, high-pressure gas enters an entry master station of the gas gathering station from the single natural gas well through a gas inlet pipeline, and enters a gas outlet pipeline after being collected by the entry master station;

s2, turning on a power supply device to supply power to the electric heating device, and heating the air outlet pipeline after the electric heating device is electrified;

s3, the heated gas enters an impeller expander to drive the impeller expander to rotate;

and S4, treating the gas flowing out of the nozzle of the impeller expander by a gas treatment process and finishing output.

Further, the high-pressure gas in the S1 has a pressure of more than 6.4 MPa.

Further, in S3, the heated gas enters the impeller expander to drive the impeller expander to rotate, so as to drive the generator on the same shaft as the impeller expander to rotate to generate power and store the power in the storage battery pack, a part of the power in the storage battery pack is used by the electric heating device to heat the air outlet pipeline in front of the impeller expander, and the other part of the power is supplied to other power equipment in the station.

The invention has the beneficial effects that:

1. the invention has the advantages of simple principle, few accessories, low cost, low maintenance workload and small occupied area, is particularly suitable for a multi-well high-pressure normal-temperature gas collection process, and can realize the functions of saving energy, reducing consumption and heating natural gas in a gas collection station.

2. The invention can replace the process system of throttling and depressurizing of the throttle valve in the station and heating of the heating furnace, convert the pressure potential energy of the high-pressure natural gas of the gathering and transportation pipe network into the heat energy required by medium heating, fully utilize the energy of the gathering and transportation system, avoid the waste and the investment of the energy and have good application prospect.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

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

Fig. 1 is a schematic structural diagram of a throttling heating system of the high-pressure gas gathering station of the natural gas well.

Description of reference numerals:

1. a station-entering master office; 2. an electric heating device; 3. a power supply device; 4. an impeller expander; 5. and (4) natural gas single well.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions.

Example 1:

the embodiment provides a throttling heating system of a high-pressure gas gathering station of a natural gas well, as shown in fig. 1, comprising a station entering main unit 1, power supply equipment 3 and an impeller expansion machine 4; one end of the station entering main engine 1 is connected with one or at least two natural gas single wells 5 which are arranged in parallel through an air inlet pipeline, the other end of the station entering main engine 1 is communicated with an impeller expander 4 through an air outlet pipeline, and an electric heating device 2 is arranged on the air outlet pipeline; the electric heating device 2 and the impeller expander 4 are respectively connected with a power supply device 3.

The working process of the throttling heating system of the high-pressure gas gathering station of the natural gas well is as follows:

high-pressure gas enters an entrance main engine 1 of a gas gathering station from a single natural gas well through a gas inlet pipeline, is collected by the entrance main engine 1, then sequentially enters an electric heating device 2 and an impeller expander 4, and is subjected to a gas treatment process to complete outward output. The impeller expander 4 is connected with a generator of the power supply device 3, the generator generates electricity and stores the electricity into a storage battery pack of the power supply device 3, the storage battery pack supplies power to the electric heating device 2, and the electric heating device 2 exchanges heat with natural gas through an air outlet pipeline to convert pressure energy of the gas into heat energy of the gas. The electric heating device 2 can supplement the gas heat energy lost by the downstream impeller expander 4 due to throttling, and meet the normal working requirements required in the station for heating, heat preservation or freezing prevention of the natural gas medium in the gas outlet pipeline.

The throttling heating system of the high-pressure gas collecting station of the natural gas well is a process system utilizing the energy of a high-pressure gathering and transportation pipe network of a gas field, realizes the functions of throttling and pressure reduction and medium heating of the gas collecting station, meets the technical requirements of high-pressure gas collection, and reduces the energy consumption and the operation cost in the gas collecting process.

Example 2:

on the basis of the above embodiment, further, the power supply device 3 includes a generator and a storage battery, the impeller expander 4 is connected with the generator, the generator generates electricity and stores the electricity into the storage battery, and the storage battery is electrically connected with the electric heating device 2.

It is further noted that the generator is coaxially connected to the impeller expander 4. After being collected by a main switch in the station, the high-pressure natural gas is conveyed to an impeller expander through a gas outlet pipeline and drives an impeller of the impeller expander to rotate at a high speed, so that a generator is driven to generate electricity and the electric energy is stored in a storage battery pack, one part of the electric energy of the storage battery pack is used for an electric heating device 2 (an electric tracing band) to heat a gas pipeline in front of the impeller expander, and the other part of the electric energy is supplied to other electric power equipment in the station.

The impeller expander is a machine which obtains energy by utilizing the principle that high-pressure gas is expanded and depressurized and mechanical work is output outwards to reduce the temperature of the gas. The main work of the impeller expander is completed in the nozzle and the impeller, and when high-speed gas passes through the impeller channel, the gas speed is reduced rapidly due to the high-speed rotation of the impeller. Meanwhile, when the gas flows in a continuously enlarged channel, the internal energy of the gas is reduced due to the reduction of pressure and speed, and the temperature of the gas is further reduced. Due to the rapid rotation of the impeller of the expansion machine, the generator at the other end of the same shaft with the impeller of the expansion machine is driven to rotate to generate electricity. The impeller expander can be used as a power source for power generation, and can also be used for regulating the flow by regulating the angle and the quantity of the impellers, so that the pressure reduction effect is achieved.

Example 3:

on the basis of the embodiment 1, further, the electric heating device 2 is an electric tracing band.

Furthermore, the electric tracing band is made of conductive plastic materials (PTC materials), and after the conductive plastic is connected with a power supply, current flows from one wire core to the other wire core through the conductive plastic to form a loop. The electric energy heats the electric tracing band, the resistance of the electric tracing band is increased immediately, when the temperature of the electric tracing band is increased to a certain value, the temperature of the conductive material is increased immediately, when the temperature of the core band is increased to a certain value, the resistance is large to the extent of almost blocking the current, the temperature of the core band is not increased any more, and meanwhile, the electric tracing band transfers heat to a heated system with lower temperature.

In this embodiment, specifically, the electric heat tracing band is wound on the outer wall of the gas outlet pipeline along the length direction of the gas outlet pipeline, so that the heat energy of the gas lost by throttling of the downstream impeller expander can be supplemented, and the normal working requirements for the natural gas medium in the pipeline in the stations such as temperature rise, heat preservation or freeze prevention can be met.

Example 4:

the embodiment provides a throttling heating method for a high-pressure gas gathering station of a natural gas well, which comprises the following steps:

s1, high-pressure gas enters the station entering main engine 1 of the gas gathering station from the natural gas single well 5 through the gas inlet pipeline, and enters the gas outlet pipeline after being collected by the station entering main engine 1;

s2, turning on the power supply device 3 to supply power to the electric heating device 2, and heating the air outlet pipeline after the electric heating device 2 is electrified;

s3, the heated gas enters the impeller expander 4 to drive the impeller expander 4 to rotate;

and S4, treating the gas flowing out of the nozzle of the impeller expander 4 by a gas treatment process and finishing output.

Further, the high-pressure gas in the S1 has a pressure of more than 6.4 MPa.

Further, in S3, the heated gas enters the impeller expander 4 to drive the impeller expander 4 to rotate, so as to drive the generator coaxial with the impeller expander 4 to rotate to generate power and store the power in the storage battery pack, a part of the power in the storage battery pack is used by the electric heating device 2 to heat the air outlet pipeline in front of the impeller expander 4, and the other part of the power is supplied to other power equipment in the station.

The process principle of the invention is as follows: high-pressure gas enters an entrance main organ 1 of a gas gathering station from a natural gas single well through a gas inlet pipeline, is collected by the entrance main organ 1, then sequentially enters an electric tracing band and an impeller expander 4, and is subjected to a gas treatment process to complete output. The impeller expander 4 is connected with a generator of the power supply device 3, the generator generates electricity and stores the electricity into a storage battery pack of the power supply device 3, the storage battery pack supplies power to the electric tracing band, and the electric tracing band exchanges heat with natural gas through an air outlet pipeline to convert pressure energy of the gas into heat energy of the gas.

In conclusion, the process disclosed by the invention has the advantages of simple principle, few accessories, low cost, low maintenance workload and small occupied area, is particularly suitable for a multi-well high-pressure normal-temperature gas collection process, and can realize the functions of saving energy, reducing consumption and heating natural gas in a gas collection station.

The throttling heating system of the natural gas well high-pressure gas gathering station can replace a process system of throttling, pressure reduction and heating of a heating furnace of a throttling valve in the station, the pressure potential energy of high-pressure natural gas of a gathering and transporting pipe network is converted into heat energy required by medium heating, the energy of the gathering and transporting system is fully utilized, meanwhile, the waste and the investment of the energy are avoided, and the throttling heating system has a good application prospect.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.