裂缝型储层酸液滤失可视化研究与应用  

Research on the visualization of acidizing fluid filtration in fractured reservoirs and its application

作　　者：王洋[1] WANG Yang(Research Institute of Petroleum Engineering,SINOPEC Northwest Oilfield Company,Urumqi 830011,Xinjiang,China)

机构地区：[1]中国石化西北油田分公司石油工程技术研究院

出　　处：《石油钻采工艺》2018年第1期107-110,117,共5页Oil Drilling & Production Technology

基　　金：国家科技重大专项"西北超深井高效钻完井工艺技术"(编号:2017ZX05005-005-009)

摘　　要：为了研究酸液在塔河裂缝型储层中的滤失机理,提高酸压过程中液体效率,利用自主研制的酸蚀裂缝可视化滤失模拟评价仪,基于网状裂缝模型,对酸液类型、交替注入级数、前置液比例和注酸排量这4种酸液滤失关键因素进行评价。试验结果表明,胶凝酸入口端效应明显,入口端裂缝宽度明显大于远端裂缝,地面交联酸酸蚀缝宽较平均,深部刻蚀效果好;交替注入级数越多,酸液滤失越小,塔河多级交替注入酸压最优级数为3~5级;前置液比例的增加,远端裂缝酸蚀宽度和深度明显增加。YJX井现场应用采用3级交替注入酸压工艺,提高注酸排量至7 m^3/min,酸压液体效率和酸蚀缝长较邻井大幅增加,酸液滤失明显降低,压后累产油1.5×10~4 t,增油效果显著。To investigate the filtration mechanism of acidizing fluid in the fractured reservoirs in Tahe and increase the fluid efficiency in the process of acid fracturing,four key factors of acidizing fluid filtration(i.e.,acidizing fluid type,alternative injection stage,prepad fluid proportion and acid injection displacement)were evaluated based on fracture network model by using the independently developed visual filtration simulation and evaluation unit of acid etched fracture.It is indicated that the effect is apparent at the inlet end of gelling acid,the fracture width at the inlet end is much larger than that at the distal end,the width of fractures etched by surface crosslinked acid is uniform and the erosion effect in deep part is good.Besides,the acidizing fluid filtration decreases with the increase of alternative injection stages,and the optimal stage number of multistage alternative injection acid fracturing in Tahe is 3-5.The etched width and depth of distal fractures increase with the increase of prepad fluid proportion.In Well YJX,3-stage alternative injection acid fracturing technology is adopted and the acid injection displacement is increased to 7 m3/min.Its acid fracturing fluid efficiency and acid etched fracture length are much greater than its neighboring well,acidizing fluid filtration is decreased significantly and the stimulation effect is remarkable with postfrac cumulative oil production of 1.5×104 t.

关 键 词：碳酸盐岩 裂缝型储层 酸液 滤失 可视化 塔河油田 

分 类 号：TE355[石油与天然气工程—油气田开发工程]