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CN-121993735-A - Natural gas gathering and transportation pipeline cooling device

CN121993735ACN 121993735 ACN121993735 ACN 121993735ACN-121993735-A

Abstract

The invention relates to the field of pipeline cooling, in particular to a natural gas gathering and transportation pipeline cooling device, which comprises a buried pipe ditch marked at a wellhead and a heating furnace marked at a transportation pipeline, wherein the buried pipe ditch is provided with a pipe ditch water circulation system to form a cooling water tank, the heating furnace is provided with a furnace body water circulation system to form a cooler, the pipe ditch water circulation system comprises a circulating water tank, a circulation pipeline is arranged between the circulating water tank and the cooling water tank, a circulation pump is arranged on the circulation pipeline, the furnace body water circulation system comprises a soft water tank marked at the heating furnace, a circulation pipeline is arranged between the soft water tank and a furnace body of the heating furnace, and the circulation pipeline is provided with a circulation pump marked at the heating furnace. The device disclosed by the invention utilizes the existing device, the water circulation system is used for cooling the gas production pipeline, the input cost is low, the process flow of the water circulation system is simple and convenient to implement, and the cooling effect is good.

Inventors

  • WANG ZENGGANG
  • PENG JUN
  • LIU HUAN
  • TIAN YUANGANG
  • HE MAOHUA
  • YANG ZHENGUO

Assignees

  • 中国石油化工股份有限公司
  • 中国石油化工股份有限公司中原油田分公司
  • 中国石油化工股份有限公司中原油田普光分公司
  • 中国石化达州天然气净化有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. The natural gas gathering and conveying pipeline cooling device is characterized by comprising a buried pipe ditch marked on a wellhead and a heating furnace marked on a conveying pipeline, wherein the buried pipe ditch is provided with a pipe ditch water circulation system to form a cooling water tank, the heating furnace is provided with a furnace body water circulation system to form a cooler, the pipe ditch water circulation system comprises a circulating water tank, a circulation pipeline is arranged between the circulating water tank and the cooling water tank, a circulation pump is arranged on the circulation pipeline, the furnace body water circulation system comprises a soft water tank marked on the heating furnace, a circulation pipeline is arranged between the soft water tank and a furnace body of the heating furnace, and the circulation pipeline is provided with a circulation pump marked on the heating furnace.
  2. 2. The natural gas gathering and transportation pipeline cooling device as recited in claim 1, wherein the circulating water pond is a fire water pond of a gas production station standard.
  3. 3. The natural gas gathering and transportation pipeline cooling device as recited in claim 1, wherein the soft water pool of the heating furnace comprises three parts of cavities which are communicated with each other, the three parts of cavities are a water inlet pool, a middle pool and a water return pool respectively, a first partition plate with an upper opening is arranged between the water inlet pool and the middle pool, and a second partition plate with a lower opening is arranged between the middle pool and the water return pool.
  4. 4. A natural gas gathering and transportation pipeline cooling device as recited in claim 1 or 3, wherein the soft water tank is provided with two soft water tanks which are arranged in parallel to form a one-standby structure.
  5. 5. The natural gas gathering and transportation pipeline cooling device as recited in claim 1, wherein two circulating pumps are respectively arranged in the circulating water tank and the soft water tank and are arranged at the bottoms of the corresponding water tanks in parallel.
  6. 6. The natural gas gathering and transportation pipeline cooling device as recited in claim 1, wherein the top of the cooling water tank, the circulating water tank and the bottom of the softening water tank are respectively provided with a liquid level monitor, and the liquid level monitor and the circulating pump are controlled in an interlocking manner.
  7. 7. The natural gas gathering and transportation pipeline cooling device as recited in claim 1, wherein the circulating pipeline comprises a water outlet pipeline and a water return pipeline, one end of the water return pipeline is of a split-flow nozzle structure, and an exhaust fan is arranged on one side of the split-flow nozzle.
  8. 8. The natural gas gathering and transportation pipeline cooling device as recited in claim 7, wherein the water outlet pipeline is provided with a gate valve and a one-way valve which are connected in series.
  9. 9. The natural gas gathering and transportation pipeline cooling device as recited in claim 7, wherein one end of a water outlet pipeline in the pipe ditch water circulation system is connected with the cooling water tank, the other end of the water outlet pipeline is connected with the circulating pump in the circulating water tank, one end of the water return pipeline is connected with the cooling water tank, a diversion nozzle at the other end of the water return pipeline is connected with the circulating water tank, and the diversion nozzle is arranged at the top of the circulating water tank and is arranged in a diagonal line with the circulating pump.
  10. 10. The natural gas gathering and transportation pipeline cooling device as recited in claim 1 or 7, wherein the upper end of the heating furnace is provided with a heating furnace water injection port, the lower end is provided with a heating furnace drain port, the heating furnace water injection port is connected with one end of a water outlet pipeline in a furnace body water circulation system, the other end of the water outlet pipeline is connected with a circulating pump in a soft water tank, the heating furnace drain port is connected with a water return pipeline, a diversion nozzle at the other end of the water return pipeline is connected with the soft water tank, and the diversion nozzle is arranged at the top of the soft water tank and is arranged diagonally to the circulating pump.

Description

Natural gas gathering and transportation pipeline cooling device Technical Field The invention relates to the field of pipeline cooling, in particular to a natural gas gathering and transportation pipeline cooling device. Background In some existing gas fields, a natural gas reservoir has the characteristics of high temperature, high pressure, high sulfur content and deep burial depth, and because the reservoir is deep and is influenced by geothermal heat and geology, the natural gas generates higher temperature, water vapor or other liquids form hydrates in the exploitation process, the water vapor or other liquids adhere to pipelines to form blockage, and the stability of transportation is influenced by the overhigh temperature, so that the exploited natural gas needs to be cooled. The existing gas production station utilizes throttling effect to reduce pressure and temperature of a gas production pipeline, a three-stage throttle valve is arranged in the gas production station, the temperature of natural gas can be greatly reduced after throttling and pressure reduction, but hydrate formation can occur when the temperature is too low, so that the temperature of the conveyed natural gas is improved in a heating furnace water bath heating mode during two-stage and three-stage throttling to prevent the formation of the hydrate, and the problem that the hydrate is precipitated before a dehydration link in advance of the natural gas can be avoided. The prior process flow of the gas production station is shown in figure 1, the underground high-temperature high-pressure high-sulfur natural gas firstly enters a gas production tree 22, a first-stage throttle valve 23 is arranged on the gas production tree, the temperature of the natural gas is primarily reduced along with the pressure after the first-stage throttle, then the natural gas passes through a buried pipe ditch 1 under the ground 28 through a gas production pipe 6, fine sand is filled in the buried pipe ditch 1 to protect the laid gas production pipe 6, the natural gas enters a second-stage throttle valve 24 at the inlet of a heating furnace 2, the temperature of the natural gas is further reduced along with the pressure, then the natural gas enters a heating furnace coil 26, the heating furnace coil 26 is soaked in high-temperature softened water which is fed into the heating furnace through a water injection port 20 at the upper end and discharged from a drain 21 at the heating furnace at the lower end, the heating furnace coil 26 heats the natural gas flowing through the heating furnace coil in a water bath, the natural gas enters a third-stage throttle valve 25 of the heating furnace for further reducing the pressure of the natural gas, the natural gas enters the heating furnace coil 26 for secondary water bath heating after the third-stage throttle valve 26, and finally the natural gas enters a metering separator for metering and enters a gas collecting trunk. But in the middle and later stages of gas field exploitation, the stratum pressure is reduced, the wellhead pressure is reduced along with the reduction, the wellhead oil temperature is unchanged, the throttling temperature reduction is reduced, even the throttling pressure reduction is not needed, and the heating furnace is in a stop state. Because the throttling and cooling effects are greatly reduced, the temperature of a conveying medium in a pipeline is gradually increased, and the pipeline displacement can occur to generate stress concentration along with the temperature increase, so that the pipeline detection and maintenance cost is increased, the service life is shortened, and even the risk of pipeline failure exists. The patent document of the utility model with the grant number of CN210506241U and the grant date of 2020/05/12 discloses a natural gas cooling device, which comprises a freezing host and a heat exchanger, wherein the freezing host is connected with the heat exchanger through a pipeline, condensate in the pipeline circularly flows between the freezing host and the heat exchanger, the inlet end of the heat exchanger is communicated with a high-temperature natural gas end, and the outlet end of the heat exchanger is communicated with a low-temperature natural gas end. When the natural gas cooling device is used, the freezing host machine carries out freezing cooling on condensate, cooled condensate flows to the heat exchanger, and the high-temperature natural gas is cooled at the heat exchanger. The device has simple flow and small limited condition, but needs to add a set of new freezing and cooling equipment in the existing gas collecting station, has large production investment, and the condensed liquid has loss in the subsequent use process, so that the condensed liquid needs to be checked and supplied, and has higher energy consumption and poor economy. Disclosure of Invention The invention aims to provide a natural gas gathering and transportation pipeline cooling de