适用于稠油热采井的激活型完井液体系  

Activated Completion Fluid for Thermal Heavy Oil Recovery

作　　者：邢希金 刘书杰 罗刚 谢仁军 

机构地区：[1]中海油研究总院,北京100028 [2]荆州市汉科新技术研究所,湖北荆州434000

出　　处：《钻井液与完井液》2016年第3期112-116,共5页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项"海上稠油热采井注汽过程储层保护实验(试验)研究"(2011ZX05024-005)项目资助

摘　　要：稠油热采井在注蒸汽过程中及关井后,进入油层的完井液滤液和蒸汽中的水在高温下将与地层岩石矿物及地层流体发生反应,产生储层伤害。为此,提出使用激活型完井液体系。引入激活酸HJS,使残留在地层中的完井液在一定温度下激活,释放出[H＋],降低pH值,减小矿物在高pH条件下溶解和转化而对储层产生的伤害;并优选出了高温防膨剂HTW、高温减阻剂HUL、高温溶蚀剂HDB、高温缓蚀剂HJP以及最优加量,构建了激活型完井液体系。室内评价表明,该体系激活温度为80℃,激活时间为60 min,激活酸HJS的加入可以大幅度提高完井液对钻屑的溶蚀能力;体系在220℃高温下老化8 h的膨胀率仅为1.11%,与地层水配伍,混合液的浊度在3.6~6.9 NTU之间,蒸汽（270℃）驱替后渗透率恢复值大于90%（测温为80℃）,表明该激活型完井液体系具有很好的储层保护效果。In thermal recovery of heavy oils, after well shut-in, the filtrates of the completion fluids entering the reservoir formations and water from the injected steam will react with rock minerals and formation fluids at high temperature. This reaction will inevitably damage the reservoir formations in contact. To avoid this damage, an activating completion fluid has been introduced. The activating acid, HJS, is used to activate the residue completion fluid in reservoir formations at certain temperature, and hydrogen ions are released to reduce the pH of the reaction system. This will mitigate the dissolution of formation minerals at high pH which is a cause of formation damage. Several additives such as high temperature swelling inhibitor HTW, high temperature friction reducer HUL, high temperature erosion agent HDB and high temperature corrosion inhibitor HJP were chosen and their optimum concentrations determined. With these additives, an activating completion fluid has been formulated. In laboratory experiments, the activating temperature of the completion fluid is 80 ℃, and the activating time, 60 rain. The use of HJS greatly enhances the dissolution of drilled cuttings by the completion fluid. The ratio of swelling of the completion fluid after aging at 220 ℃ for 8 h is only 1.11%. The completion fluid is compatible with formation waters, and the turbidity of the mixed fluid is between 3.6 NTU and 6.9 NTU. The recovery of permeability after steam （270 ℃） flooding is greater than 90% （measured at 80℃）. These data demonstrate that the activating completion fluid plays a positive role in protecting reservoir formations.

关 键 词：稠油热采 完井液 激活型 减阻 蒸汽驱替 防止地层损害 

分 类 号：TE257.6[石油与天然气工程—油气井工程]