一种W/O乳化液在海上高温砂岩储层分流酸化中的评价与应用  

Application of An Invert Emulsion in Diverted Acidizing of High Temperature Offshore Sandstone Reservoirs

作　　者：吴广 荣新明[1] 周泓宇 白冰 张博[1] 王春林[1] WU Guang;RONG Xinming;ZHOU Hongyu;BAI Bing;ZHANG Bo;WANG Chunlin(China Offshore Service Limited Co., Tianjin 300459;CNOOC (China) Co., Ltd. ZhanjiangBranch, Zhanjiang,Guangdong 524057;CNOOC (China) Co., Ltd. Tianjin Branch, Tianjin 300459)

机构地区：[1]中海油田服务股份有限公司,天津300459 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057 [3]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《钻井液与完井液》2018年第5期109-114,120,共7页Drilling Fluid & Completion Fluid

摘　　要：针对目前酸化常用分流剂无法简便有效地应用于海上高温砂岩储层油田酸化作业的现状,研制了一种由活性柴油与地层采出水配制的W/O乳化液分流体系。实验优选出的活性柴油与地层采出水比例为3∶7的乳化液在130℃和170 s^(-1)剪切速率下仍然具有40 mPa·s的黏度,单管岩心封堵实验表明,其对模拟水层与油层岩心的封堵率分别为大于80%和小于21.6%,并联双管岩心封堵分流实验表明其对低渗油层的分流率均能达到80%以上,分流酸化物理模拟实验表明,乳状液分流酸化后低渗油层岩心的渗透率增大170%左右,高渗水层岩心的渗透降低60%左右。该技术在南海西部油田矿场应用中取得了日增油103.3 m^3/d、含水率降低18.8%的显著增油降水效果,具有较大推广价值。Diversion agents conmonly used in present acidizing operations are unable to be easily and effectively used in acidizing high temperature offshore sandstone reservoirs.An invert emulsion diverting system has been developed with an active diesel oil and formation water to overcome this deficiency.The volumetric ratio of the active diesel oil and formation water is3:7in the emulsion which has viscosity of 40mPa·s even shearing at170s^-1 under130℃.Single barrel core test results showed that the permeability of simulated cores of water zones was reduced by more than80%,and the permeability of simulated cores of oil zones reduced by less than21.6%.Parallel dual-barrel core test results showed that the rate of diversion of the emulsion to low permeability pay zones was greater than80%.Diverted acidizing physical simulation experimental results showed that after diverted acidizing with the emulsion,the permeability of low permeability pay zones was increased by about170%,and the permeability of high permeability water zones reduced by about60%.This technology has been applied in Nanhai West Oilfield,the oil production rate was increased by103.3m^3/d,and the water cut was reduced by18.8%,indicating that the technology is worth spreading.

关 键 词：高温储层 砂岩酸化 分流工艺 W/O乳化液 海上油田 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]