异常高压凝析气藏早期产水水源分析与识别

ANALYSIS AND IDENTIFICATION OF THE SOURCE OF EARLY WATER PRODUCTION IN ABNORMAL HIGH PRESSURE CONDENSATE GAS RESERVOIRS

M气田为一异常高压湿气凝析气藏,具有高温、高压、低渗高导流等特点。由于气藏具有高含凝析水特征以及复杂的边底水系统,在开发初期伴随着气井的高产,气井产水特点也呈现复杂多样性。根据气井产水指标特点、生产动态分析以及产水水性资料对比,结合气田开发过程中的工程事件技术分析,基于多种方法对M气田气井早期产水来源进行综合分析与判断。研究结果表明:当气井处于高压、高产状态下,气井少量的产水也有可能预示着地层水的过早水侵或突破,应采取有效的方法及早识别产出水来源.同时气田开发过程中的工程事件也可能对气井产水带来一定影响,在采用常规方法进行识别产水来源时,应结合气田或气井的实际开发情况合理分析,才能得出准确可靠的认识。

M gas field as a moisture condensate gas reservoir with abnormal high pressure has the characteristics of high temperature,high pressure,low permeability and high conductivity.Due to high water feature and complex system of edge and bottom water,The characteristics of water production of gas wells has complicated along with the high-yielding in the early development stage of the condensate gas reservoirs.Based on water production characteristics,production performance analysis,water data of gas wells in M gas field and technical analysis of engineering accident in gas field development process,a variety of methods of identifying water source were used for comprehensive analysis and judgment.The study results show that:When the gas reservoir is under high pressure status,a small amount of water production of gas well with high-yield may also indicate early water influx or break.So effective methods should be adopted to identify source of water production earlier.At the same time engineering events during the development stage of gas fields can also affect water production of gas well.Therefore,when using conventional methods to identify sources of water production,it is necessary to analyze problem rationally combined with actual development conditions of gas field or gas well in order to obtain accurate and reliable conclusion.