特低渗砂岩储层敏感性实验研究

Experimental study of sensitivity of extra low permeability sandstone reservoir

通过分析长庆某区块的岩性特征、物性特征、孔隙孔喉结构、裂缝及储层温度压力系统等进行系统研究,得到长庆某区块的潜在损害因素,在此基础上进行储层敏感性实验分析,进一步得到储层的损害机理。分析结果表明,储层整体敏感性较弱,速敏、水敏、盐敏、碱敏弱,酸敏强,应力敏感性强。在该区块作业中需要控制合理的钻井完井液密度,钻井完井液体系宜尽量采取高矿化度体系,在采取增产措施过程中需采取预防措施应对酸化压裂带来的额外损害。

Through the analysis of Changqing a block of lithological characteristics, physical properties, pore throat structure of pore, fracture and reservoir temperature and pressure system were systematically studied, potential damage factors obtained Changqing certain blocks of experimental analysis of reservoir sensitivity, on this basis, further mechanism of reservoir damage. The analysis results show that, the overall weak sensitivity of reservoir velocity sensitivity, water sensitivity, alkali sensitivity, Yan Min, weak, strong acid sensitivity, strong stress sensitivity. The need to control drilling fluid density and reasonable in the block operations, drilling and completion fluid system should be adopted in high salinity system, take measures to increase production in the process to take additional damage prevention measures to deal with the acid fracturing brought.