深层页岩气产液与井筒流态特征分析

Analysis of fluid production and wellbore flow characteristics of deep shale gas

深层页岩气产液与井筒流态特征分析显示,深层页岩气井产液量先上升后下降,呈现快速上升、快速递减、缓慢递减、稳定产水及措施排液五个阶段。产液量峰值出现在2~3周,随后快速递减,高产液阶段持续3~4个月。井筒流态特征则包括直线型、折曲线型及全井筒不稳定型,全周期井筒流压梯度呈双“U”型变化。初期压力梯度高,产液量大,随后迅速下降,进入稳定生产期后压力梯度变小,生产稳定。后期产气量下降,排液困难,井底存在积液风险。

Fracturing and transformation of deep shale gas reservoirs are difficult and have complex fluid production characteristics.Currently,there is insufficient research on thefluid production and backflow characteristics under different blocks and transformation methods,which affects development efficiency.This article delves into the characteristics offluid production and wellboreflow in deep shale gas wells.Through tracking and analyzing thefluid production and wellboreflow,the research results show that the changes in gas wellfluid production can be divided intofive stages:rapid increase,rapid decrease,slow decrease,stable water production,and measure drainage.The wellboreflow characteristics can be divided into three types:straight line,curved line,and full wellbore unstable.The full cycle wellboreflow pressure gradient shows a double"U"shape change,thereby clarifying the timing of measure process intervention and providing technical support for thefine management and development of deep shale gas.