江陵凹陷新沟嘴组钻井油层伤害机理与保护对策研究  

On Damage Mechanism of and Protection Measures for Drilling Reservoir in Xingouzui Formation of Jiangling Depression

作　　者：桑利 SANG Li(Exploration & Development Research Institute of Jianghan Oilfield Company, SINOPEC, Wuhan, Hubei, 430223, China)

机构地区：[1]中石化江汉油田分公司勘探开发研究院,湖北武汉430223

出　　处：《江汉石油职工大学学报》2020年第3期18-20,共3页Journal of Jianghan Petroleum University of Staff and Workers

摘　　要：江陵凹陷新沟嘴组是一套含膏盐地层,其油层伤害问题一直处于争议之中。从该区钻遇地层岩性入手,分析钻井泥浆滤液成分变化,发现钻遇咸化期沉积的无水芒硝层时,钻井液硫酸根含量大幅度增加,泥浆滤液侵入油层会形成硫酸钙沉淀,降低油层物性;进一步开展泥浆滤液浸入深度研究,发现泥浆滤液侵入深度超过了射孔深度,存在油层伤害。为避免钻井液伤害油层,建议采用更换泥浆或采取近平衡、屏蔽暂堵、快速完井和深穿透射孔技术。Xingouzui Formation in Jiangling Depression is a set of salt-bearing formation.How its reservoir is damaged is always in dispute.Based on drilling strata lithology in this area,this paper analyzes composition changes of drilling mud filtrate,and finds that when drilling anhydrous mirabilite layer deposited during the salinization period,the sulfate content of drilling fluid increases greatly and the mud filtrate invades the oil layer and forms calcium sulfate precipitation,which reduces the physical properties of the oil layer.Further research is carried out on the depth of mud filtrate immersion,and it is found that the penetration depth of mud filtrate exceeded the perforation depth,resulting in oil layer damage.In order to avoid drilling fluid damage to the reservoir,it is recommended to replace the mud or adopt technologies including near-balance,shielding and temporary plugging,quick completion and deep penetration perforation.

关 键 词：江陵凹陷新沟嘴组 钻井液伤害 油层保护 泥浆滤液 

分 类 号：TE122.2[石油与天然气工程—油气勘探]