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CN-121994551-A - On-line sampling and separating device and method for gas field raw gas

CN121994551ACN 121994551 ACN121994551 ACN 121994551ACN-121994551-A

Abstract

The invention discloses an online sampling and separating device and method for gas field raw material gas, and relates to the technical field of gas sampling. The utility model provides an online sampling separator of gas field raw materials gas, it includes raw materials gas collection and transportation mechanism, raw materials gas sampling mechanism, sample collection and transportation mechanism includes the trunk line, the trunk line is connected with gets gas pipeline and return air pipeline, raw materials gas sampling mechanism includes sampling pipeline, sampling pipeline's inside has spoiler and sample inner tube, sample flow cavity is connected with sample pipeline, sample collection and transportation mechanism includes sample gas pipeline, sample gas pipeline is connected with the tee bend valve, the tee bend valve be connected with collection bottle and separator, the separator is connected with the filter, the filter is connected with the drain line. The gas field raw material gas on-line sampling and separating device is adopted by the gas field raw material gas on-line sampling and separating method. The gas field raw gas online sampling and separating device and method have the advantages of good sampling representativeness and online sampling.

Inventors

  • YANG KUN
  • DAI ZHIXIANG
  • WANG FENG
  • DAI WANNENG
  • BIE QIN
  • ZHENG SIJIA

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (10)

  1. 1. The on-line sampling and separating device for the gas field raw gas is characterized by comprising a raw gas collecting and conveying mechanism (1), a raw gas sampling mechanism (2) and a sample collecting and processing mechanism (3), The raw material gas gathering and conveying mechanism (1) comprises a main pipeline (11), the main pipeline (11) is connected with a gas taking pipeline (12) and a gas returning pipeline (13), The feed gas sampling mechanism (2) comprises a sampling pipeline (21), an inlet of the sampling pipeline (21) is connected with an outlet of the gas taking pipeline (12), a spoiler (22) and a sampling inner pipe (23) are sequentially arranged inside the sampling pipeline (21) along the flowing direction, a sample flowing cavity (24) is formed between the sampling inner pipe (23) and the sampling pipeline (21), the sample flowing cavity (24) is connected with a sample pipeline (27), an outlet of the sampling inner pipe (23) is connected with an inlet of the gas returning pipeline (13), The sample collection and treatment mechanism (3) comprises a sample gas pipeline (31) connected with the sample pipeline (27), the sample gas pipeline (31) is connected with a three-way valve (32), a collection bottle (353) and a separator (363) are connected with the three-way valve (32), the separator (363) is connected with a filter (364), and the filter (364) is connected with a vent pipeline (367).
  2. 2. The gas field raw gas on-line sampling separation device according to claim 1, wherein a main valve (112) is arranged on the main pipeline (11) between the gas taking pipeline (12) and the gas returning pipeline (13), the gas taking pipeline (12) is provided with a gas taking valve (121), and the gas returning pipeline (13) is provided with a gas returning valve (131).
  3. 3. The on-line sampling separator according to claim 2, wherein the gas extraction pipe (12) is provided with a gas extraction pressure gauge (122) on the downstream side of the gas extraction valve (121), and the gas return pipe (13) is provided with a gas return pressure gauge (132) on the upstream side of the gas return valve (131).
  4. 4. The gas field raw gas on-line sampling and separating device according to claim 1, wherein a pipeline connected between the separator (363) and the three-way valve (32) is sequentially provided with a separation gas pressure gauge (332), a separation gas thermometer (342) and a separation gas pressure reducing valve (372), and a pipeline connected between the collection bottle (353) and the three-way valve (32) is sequentially provided with a sample gas pressure reducing valve (371), a sample gas pressure gauge (331) and a sample gas thermometer (341).
  5. 5. The on-line sampling separator as claimed in claim 4, wherein a conduit connecting between the separator (363) and the three-way valve (32) is provided with a visualisation pipe (362), and an inlet of the visualisation pipe (362) is provided with a sampling valve (361).
  6. 6. The on-line sampling separator according to claim 1, wherein the inlet and outlet of the collection bottle (353) are provided with an inlet valve (351) and an outlet valve (352), respectively.
  7. 7. A gas field feed gas on-line sampling separator according to claim 1, characterized in that the blow down conduit (367) is provided with a flow meter (365) and a pressure reducing valve (366).
  8. 8. The on-line sampling separator as claimed in claim 1, wherein a plurality of the sample pipes (27) are combined and connected to one sample pipe (27), the combined sample pipe (27) is connected to the sample gas pipe (31), and the combined sample pipe (27) is provided with a pressure release valve (26).
  9. 9. A gas field feed gas on-line sampling separator according to claim 8, characterized in that the sample conduit (27) after non-combination is provided with a sample valve (25).
  10. 10. A gas field raw material gas on-line sampling and separating method is characterized in that the gas field raw material gas on-line sampling and separating device as shown in claim 1 is adopted, and the method further comprises the following steps, Confirm that all valves of the raw material gas sampling mechanism (2) and the sample collection processing mechanism (3) are in a closed state, Next, opening the air taking valve (121), observing that the reading of the air taking pressure meter (122) is stable, opening the air returning valve (131), closing the main valve (112) after the reading of the air returning pressure meter (132) is stable, opening a proper number of sample valves (25) according to the sampling requirement, controlling the three-way valve (32) to be communicated with the collecting bottle (353), enabling the raw material gas to flow into the collecting bottle (353) to realize sampling collection, Then, after the sampling is finished, the pressure release of the sample collecting and processing mechanism (3) is finished through the sample gas pressure reducing valve (371) and the separation gas pressure reducing valve (372), then the three-way valve (32) and the sample valve (25) are sequentially closed, the main valve (112) is opened, the gas taking valve (121) and the gas returning valve (131) are closed, Finally, the sample valve (25) and the pressure release valve (26) are opened, and the raw material gas sampling mechanism (2) is released to be the same as the atmospheric pressure.

Description

On-line sampling and separating device and method for gas field raw gas Technical Field The invention relates to the technical field of gas sampling, in particular to an on-line sampling and separating device and method for gas field raw material gas. Background Natural gas is a high-quality, efficient, green and clean low-carbon energy source, accelerates the utilization of the propelling natural gas, improves the specific gravity of the natural gas in primary energy consumption, is a revolution for steadily propelling energy consumption, and constructs a modern energy system with low carbon, safety and high efficiency. The separation efficiency of the gathering and conveying system has great influence on downstream equipment, the separation efficiency needs to be evaluated, and the solid-liquid two phases of which the raw material gas is not completely separated influence the safe and efficient operation of the ground system. At present, the shutdown accident of the running compressor of part of the gas gathering stations frequently occurs, and the shutdown is mainly caused by the damage of sealing equipment such as piston rings, gas valves and the like caused by upstream water and sand. Therefore, it is necessary to evaluate the separation effect of the feed gas collection and transportation process system, so as to propose an optimization suggestion of the separation process. The sampling difficulty of the raw gas gathering and conveying system is high, the sample representativeness needs to be further improved, and the sampling equipment is yet to be developed. In the evaluation of the effect of a separator, in order to achieve the purpose of accurately evaluating the separation efficiency, it is a critical step in measuring the solid-liquid phase content, and therefore, it is necessary to take out a representative sample in the separation system. At present, the device for sampling the natural gas gathering and transporting system is mainly aimed at the gas quality, the multiphase medium sampling technology of the raw gas gathering and transporting system is adopted, and the sampling and separating of solid-liquid impurities are less considered. For example, CN117740479a discloses a device for sampling and detecting natural gas, which comprises a steel cylinder provided with an air inlet and an air outlet, the two ends of the inner cavity of the steel cylinder are both provided with ventilation pipes for air inlet and air exhaust, and a push-pull mechanism for extracting or discharging natural gas is further provided in the steel cylinder, so that the sampling of natural gas can be realized, but the sample cannot be separated on line. Therefore, the existing natural gas sampling technology has a certain limitation, solid-liquid phase mixed natural gas is not considered, and the extracted sample is not representative. Therefore, the prior art needs to be improved. Disclosure of Invention The technical problem to be solved by the invention is that the natural gas sampling technology has larger limitation, the taken sample is not representative, the invention aims to provide the gas field raw material gas on-line sampling separation device and method, and the device and the method have the beneficial effects of good sampling representativeness and on-line sampling by adopting the corresponding technical scheme. The invention is realized by the following technical scheme: an on-line sampling and separating device for gas field raw gas, which comprises a raw gas collecting and conveying mechanism, a raw gas sampling mechanism and a sample collecting and processing mechanism, The raw material gas gathering and conveying mechanism comprises a main pipeline which is connected with a gas taking pipeline and a gas returning pipeline, The feed gas sampling mechanism comprises a sampling pipeline, an inlet of the sampling pipeline is connected with an outlet of the gas taking pipeline, a spoiler and a sampling inner pipe are sequentially arranged in the sampling pipeline along the flowing direction, a sample flowing cavity is formed between the sampling inner pipe and the sampling pipeline, the sample flowing cavity is connected with the sampling pipeline, an outlet of the sampling inner pipe is connected with an inlet of the gas returning pipeline, The sample collection and treatment mechanism comprises a sample gas pipeline connected with the sample pipeline, the sample gas pipeline is connected with a three-way valve, the three-way valve is connected with a collection bottle and a separator, the separator is connected with a filter, and the filter is connected with an emptying pipeline. Further, in the present invention, a main valve is disposed on the main pipe between the air intake pipe and the air return pipe, the air intake pipe is provided with an air intake valve, and the air return pipe is provided with an air return valve. In the present invention, the air intake pipe is provided with an air intake pr