塔里木盆地深层中-高渗砂岩储层钻井完井损害评价

Evaluation of Drilling and Completion Damage in Deep Medium-to-High Permeability Sandstone Reservoir in Tarim Basin

滕学清 康毅力 张震 游利军 杨玉增 林冲

TENG Xueqing KANG Yili ZHANG Zhen YOU Lijun YANG Yuzeng LIN Chong

中国石油塔里木油田分公司油气工程研究院, 新疆库尔勒 841000; 油气藏地质及开发工程国家重点实验室(西南石油大学), 四川成都 610500

Research Institute of Petroleum Engineering, PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China

针对塔里木盆地A区块深层中孔中-高渗砂岩储层钻井完井过程中储层损害严重的问题，基于储层地质特征分析了潜在的储层损害因素，通过室内损害评价试验和钻井液侵入深度数值模拟评价了储层损害的程度，分析了储层损害的机理，探讨了储层损害控制原则。试验结果为：储层流体敏感性损害率为11%~34%，总体较弱；钻井液损害较严重，钻井液动态损害储层岩样的渗透率恢复率为35%~70%，钻井液滤液静态损害储层岩样的损害率为28%~47%；钻井周期内钻井液滤液侵入储层的深度可达几十米。研究结果表明，钻井液固相颗粒粒径偏小和深层高温下屏蔽暂堵材料的磨蚀粒度降级导致滤饼暂堵能力和承压能力不足，引发固相堵塞和钻井液与地层流体的不配伍反应，造成了A区块深层中-高渗砂岩储层损害。研究成果可为制定深层中孔中-高渗砂岩储层损害控制原则及配套技术措施提供依据。

Targeting the serious reservoir damage during drilling completion processes of deep medium porosity,medium-high permeability sandstone reservoirs in Block A of Tarim Basin,potential reservoir damage factors were analyzed based on the reservoir’s geological characteristics.By virtue of damage evaluation testsin the lab and numerical simulation of the drilling fluid invasion depth,the degree of reservoir damage was evaluated,the reservoir damage mechanism was analyzed,and the reservoir damage control principles were discussed.The results are as follows:the damage rate of reservoir fluid sensitivity overall was weak,11%-34% on average.The damage by the drilling fluid was serious,where the permeability recovery rate of rock samples with drilling fluid dynamic damage was 35%-70%,the damage rate of rock samples with drilling fluid static damage was 28%-47%.The invasion depth of drilling fluid filtrating into the reservoir could be up to tens of meters during a drilling cycle.The study results showed that drilling fluid with smallparticle size solids combined with the degradation of abrasive particle size of the shield temporary plugging material under deep layer/high temperature would lead to insufficient shield temporary plugging capacity and insufficient pressure bearing capacity of the filter cake.Under these circumstances,solid phase plugging and incompatibility between drilling fluid and formation fluid would occur,which might further damage the deep medium-high permeability sandstone reservoirs in Block A.The research results could provide references for formulating the control principles and supporting technical measures of deep medium porosity,medium-high permeability sandstone reservoirs.

国家自然科学"基于逾渗和固液两相流理论的裂缝性储层工作液漏失损害预测与控制"（编号：51604236）和非常规油气层保护四川省青年科技创新团队项目（编号：2016TD016）联合资助。

https://doi.org/10.11911/syztjs.2018007