CO2井试采压力变化及其原因分析  

ANALYSIS ON TEST PRESSURE CHANGES AND CAUSES FOR CARBON DIOXIDE GAS WELLS

作　　者：邱必兰[1] 张伟菊[2] 邱成[3] 

机构地区：[1]大庆油田有限责任公司油藏评价部,黑龙江大庆163453 [2]大庆油田有限责任公司试油试采分公司,黑龙江大庆163412 [3]大庆油田有限责任公司井下作业分公司,黑龙江大庆163453

出　　处：《大庆石油地质与开发》2010年第3期133-136,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：为研究CO2气井井筒中压力的分布规律，根据CO2气体的物理性质、相态特征，分析了CO2气体开井、关井期间在垂直井筒内的相态变化；根据井口压力与井底压力之间的关系，分析了CO2气体在试采期间井口压力发生异常变化的原因。得出了CO2气体在垂直井筒内的相态变化规律，井口压力与井底压力呈非线性变化关系，井口压力不能准确地反映井底压力变化的认识。研究结果有利于CO2气井试采方法的改进。According to properties and phase state characteristics of CO2 , this paper analyzes the variation of CO2 in vertical wellbores during flow and shut in periods so as to study the wellbore pressure distribution laws in CO2 gas wells. The cause of abnormal pressure change of CO2 during early production test is analyzed based on the relation- ship of pressure between wellhead and well bottom. Phase state change of CO2 in vertical wellbore is obtained, that is the pressure relationship of wellhead and bottom is non-linear and wellhead pressure does not accurately reflect the change of bottom-hole pressure. The results arc beneficial for the improvement of production test method for CO2 gas well.

关 键 词：CO2气井 压力温度变化 相态变化 井口压力 井底压力 

分 类 号：TE373[石油与天然气工程—油气田开发工程]