摘要
西湖凹陷各气田产出水以多种形态存在,其产水量直接影响气井的产能及开发效果。选取西湖凹陷不同构造带的3口代表井,应用高温高压流体相态技术和低温冷凝分离装置精确测定天然气中的凝析水含量,探讨温度、压力、矿化度及流体组成对天然气中凝析水含量的影响。研究结果表明:天然气溶解作用会造成低矿化度样品比高矿化度样品的凝析水含量更高;西湖凹陷天然气中凝析水含量随温度的升高及压力的下降而升高,在低压和高温区间凝析水含量的增速显著加快;CO 2含量的升高会使天然气溶解地层水的能力增强,进而使凝析水含量升高;气油比越低,凝析水含量就越高,但与压力和温度等因素相比,气油比对凝析水含量的影响相对较小。
The output water of production wells in Xihu Depression exists in many forms and water production seriously affects gas well productivity and development effect.In this paper,three representative wells in different structural zones of Xihu Depression are selected to accurately determine the content of condensate in natural gas by means of high temperature and high pressure fluid phase technology and low temperature condensation separation unit.The effects of temperature,pressure,salinity and fluid composition on the condensate content of natural gas are also discussed.Research shows that:the dissolution of natural gas can result in a higher content of condensate water in low-salinity samples than in high-salinity samples;the contents of condensate water in natural gas increase with the increase of temperature and the decrease of pressure in Xihu Depression.At low pressure and high temperature,the increase rate of condensate content is accelerated significantly.The increase of CO 2 content also increases the ability of natural gas to dissolve formation water.The lower GOR is,the higher the condensate content will be.However,compared with the influence factors such as pressure and temperature,GOR has relatively little influence on the condensate content.
作者
徐波
胡碧瑶
王宁
XU Bo;HU Biyao;WANG Ning(CNOOC Central Laboratory(Shanghai),CNOOC EnerTech-Drilling&Production Co.,Shanghai 200941,China;CNOOC Central Laboratory(Shenzhen),CNOOC EnerTech-Drilling and Production Co.,Huizhou Guangdong 516000,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2021年第2期50-54,共5页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
“十三五”国家科技重大专项“东海深层低渗-致密天然气勘探开发技术”(2016ZX05027-004)。
关键词
西湖凹陷
凝析水
温度
压力
矿化度
流体组成
溶解作用
Xihu Depression
condensate water
temperature
pressure
salinity
fluid composition
dissolution
