水相相态变化规律及气井产水成因研究  

STUDY ON THE LAW OF AQUEOUS PHASE CHANGES AND THE ORIGIN OF WATER PRODUCTION IN GAS WELL

作　　者：刘辉[1] 董俊昌[1] 崔勇 廖旭平[3] 代琤 刘扬[1] 甯波[1] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油海外勘探开发公司 [3]中国石油天然气管道局国际事业部 [4]川庆钻探工程公司地质勘探开发研究院

出　　处：《钻采工艺》2011年第3期52-54,115,共3页Drilling & Production Technology

基　　金：国家"973"重点基础研究规划项目(2003CB214602)资助

摘　　要：温度和压力是影响天然气中水相相态变化的主要因素,气体在从储层流向地面的过程中,会产生等温降压渗流和降温卸压流动两个物理过程,在这两个过程中必然会引起天然气中的水相发生蒸发或凝析现象。分析表明在等温降压渗流过程中只发生单向蒸发现象;在降温卸压流动过程中会发生蒸发与凝析的双向变化过程。通过水相相态的变化规律的分析,研究了天然气中水蒸汽含量随温度和压力的变化规律,计算了气井的凝析水量,结合气井出水特征综合判断了气井产水的来源,对于制定合理的气井工作制度具有一定的指导意义。Temperature and pressure are two main factors that affected aqueous phase change in natural gas. While gas flow from reservoir to ground, there will have two flow process. One is isothermal seepage and pressure release, the other is temperature drop and pressure release. In the both course of production, the occurrence of water evaporation and condensation would be appeared. Analysis showed that water evaporation just only happened in the isothermal process of pressure release and that water evaporation and condensation appeared in the process of temperature and pressure release. Through the analysis of the aqueous phase changes, production of condensate liquid was calculated and its change with the temperature and pressure was analyzed. Based on the amount and the features of condensate water, the source of production water could easily be determined. This study has certain significance for the development of natural gas.

关 键 词：气藏 地层水 水相相态 凝析水 

分 类 号：TE311[石油与天然气工程—油气田开发工程]