现场水分析技术及其在东方气田高温高压气井中的应用

An on-site technique of water analysis and its application in gas wells with high temperature and pressure in DF gasfield

在高温高压气井钻井作业中,钻井液体系调整较频繁且调整范围大、侵入地层较深,导致电缆测试样品的流体性质和侵入地层的钻井液滤液组成比例难以准确判断,为此探索了一种新的现场水分析技术,并在莺歌海盆地东方气田高温高压气井中取得了良好的应用效果。应用本文提出的现场水分析技术,可以快速准确地定量分析电缆测试储层流体中的钻井液滤液和地层水的组成比例,计算储层中流体的总矿化度,进而有助于定性识别流体性质,指导现场测试取样作业,为作业者提供快捷的决策依据。

During drilling operation in gas wellswith high temperature and pressure,it is difficultto accurately identify the fluid properties of wire-line test samples and the fluid proportion occupiedby mud filtrated into the formation,due to fre-quently and widely adjusting the drilling mud sys-tem and deeper mud invasion.Therefore,a newon-site technique of water analysis was developed,and its application has resulted in good effects inthe gas wells with high temperature and pressurein DF gasfield,Yinggehai basin.This on-site tech-nique can rapidly and accurately quantify the pro-portion of mud-filtrate to formation water in thereservoir fluid from wireline test,calculate the to-tal salinity in reservoir fluid,be helpful to qualita-tively identify the fluid properties,guide the on-site test sampling,and provide timely the decisionevidences for operators.