DF13高温高压气藏天然气含水率实验测试研究

Experimental Investigation on Water Content of Natural Gas in DF13 High-temperature and High-pressure Gas Reservoir

气藏在形成过程中始终伴随地层水共存,在高温高压的环境下,烃-水互溶能力较强,天然气中水组分含量也比普通气藏高,且对气藏开发影响较大。本文提出了一套适合高温高压气藏的天然气含水率测试新方法,成功测试出DF13气藏天然气含水率随温压的变化规律。结果表明:天然气水组分含量随压力的升高而降低,低压阶段降幅较快,高压阶段变化较平缓,且与压力呈指数关系;天然气水组分含量随温度的升高而升高,受压力的影响较明显。

The formation of gas reservoirs is always accompanied by water.In the environment of high temperature and high pressure,the hydrocarbon-water miscibility is strong,and the water component content of natural gas is higher than that of ordinary gas reservoirs.A new method to test the natural gas moisture content suitable for high temperature and high pressure gas reservoir was proposed,and the variation law of natural gas water content with temperature and pressure in DF13 gas reservoir was successfully tested.The result showed that the content of water components in natural gas decreased with the increase of pressure,especially in low pressure stage and changes gently in high pressure stage.The relationship between water component content and pressure was exponential.The water component content of natural gas increased with temperature,and was affected by the pressure obviously.