高压含蜡凝析气析蜡点实验测试方法及应用  

Experimental Test Method and Application of High-Pressure Wax-Bearing Condensate Gas Wax Precipitation Point

作　　者：谢泱 刘建仪[2,3] 汪春浦 Xie Yang;Liu Jianyi;Wang Chunpu(CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610051,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油川庆钻探工程公司,四川成都610051 [2]西南石油大学,四川成都610500 [3]油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《特种油气藏》2022年第5期132-138,共7页Special Oil & Gas Reservoirs

基　　金：中国石油川庆钻探工程有限公司科技项目“苏里格致密砂岩气藏剩余气刻画及挖潜技术研究”(CQ2021B-36-Z3-1)。

摘　　要：针对高压含蜡凝析气在气相状态下析蜡点测试准确率低的问题,在优选黏温曲线法、差示扫描量热法、偏光显微镜法的基础上,研制了一套基于偏光显微镜法的高压可视化流体相变观测装置,对不同压力下含蜡凝析气井流物与含气油的析蜡点规律进行实验研究。结果表明:偏光显微镜法测得的析蜡点较黏温曲线法与差示扫描量热法更准确;新研制的高压可视化流体相变观测装置可准确测试含蜡凝析气井流物与含气油的析蜡点;含蜡凝析气井流物的析蜡点随压力增加,先降低再升高,经过露点后又降低,且析蜡线将井流物析蜡相图分为单一气相、气-液两相、气-固两相以及气-液-固三相4个部分;含气油的析蜡点随压力增加先降低,当压力增加至饱和压力后析蜡点开始呈线性上升趋势。该研究结果为高压含蜡凝析气析蜡点准确测试提供了新方法。To address the problem of low accuracy of wax precipitation point testing of high-pressure wax-bearing condensate gas in the gas phase,a set of high-pressure visualized fluid phase change observation device based on polarized light microscopy method was developed with reference to the preferred viscosity-temperature curve method,differential scanning calorimetry method and polarized light microscopy method to experimentally study on the wax precipitation point law of the wax-bearing condensate gas well fluid and gas-bearing oil under different pressures.The result shows:The wax precipitation point measured by polarized light microscopy method is more accurate than that by the viscosity-temperature curve method and differential scanning calorimetry method.The newly developed high-pressure visualized fluid phase change observation device can accurately test the wax precipitation point of wax-bearing condensate gas well fluid and gas-bearing oil.The wax precipitation point of the wax-bearing condensate gas well fluid first decreases and then increases with the increase of pressure,and then decreases after passing the dew point,and the wax precipitation line divides the well fluid wax precipitation phase diagram into such four parts as the single gas phase,gas-liquid phase,gas-solid phase and gas-liquid-solid phase;the wax precipitation point of gas-bearing oil first decreases with the increase of pressure,and begins to increase linearly when the pressure increases to the saturation pressure.The research results provide a new method for accurate test of the wax precipitation point of high-pressure wax-bearing condensate gas.

关 键 词：含蜡凝析气 相态 析蜡点 偏光显微镜 高压气藏 

分 类 号：TE135[石油与天然气工程—油气勘探]