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In the field of analysis and measurement of natural gas, China has established a series of technologies acting on international convention. The article summarizes the detection technologies including sampling of natural gas, composition analysis, detection of sulfide content, determination of water/hydrocarbon dew point, solid particulate matter, other hazardous and noxious substances, property parameter calculation, and preparation of reference material. Quality assurance to analysis result was also put forward from the aspects of proficiency test in laboratory as well as analysis comparison. With rapid development of natural gas industry and increasing international trade of natural gas, new demand was raised in analyzing and measuring natural gas. The paper also outlooks the development direction of natural gas analysis and measurement technology. [ABSTRACT FROM AUTHOR]

Aimed at the application situation of light hydrocarbon plant of northwestern Sichuan Gas District of PetoChina Southwest Oil & Gasfield Company, this paper deeply analyzed the factors affecting the light hydrocarbon yield. hen, a series of reform measures to improve the light hydrocarbon yield were proposed, which included expander amelioration, expansion rate adjustment, pressure of the seal gas control and opening degree of nozzle adjustment. The result showed hat the obvious effect can be obtained after taking above measures. [ABSTRACT FROM AUTHOR]