低渗油藏纳米粉体堵剂性能评价及应用  

Evaluation on performance of nano-powder plugging agent and its application in low-permeability reservoirs

作　　者：龚险峰[1] 祝明华[1] 吴广涛[1] 王成军[1] 张巧玲[1] 

机构地区：[1]中国石化中原油田分公司采油三厂,山东莘县252429

出　　处：《石油钻采工艺》2015年第5期104-108,共5页Oil Drilling & Production Technology

摘　　要：针对常规无机颗粒堵剂不适合特低渗砂岩油藏卫360 块挤堵的问题,对纳米粉体堵剂的性能进行了室内综合评价.密度1.4-1.8 g/cm3 堵剂浆体的黏度小于35 mPa·s,注入性好,能进入地层深部孔隙;悬浮性好,密度大于1.6 g/cm^3 时,浆体基本不分层;固化时间可调,施工安全,初凝时间2.7-18.5 h,终凝时间3.1-28.1 h;固化后体积不收缩,抗压强度大于25 MPa,封堵率达到99.9%;具有一定的溶解性,渗透率恢复率大于50%.介绍了现场挤堵工艺,掌握挤堵关键环节和精细施工能提高挤堵一次成功率.在低渗油藏卫360 块应用27 井次,工艺成功率100%,增油有效率100%.纳米堵剂是一种高效新型堵剂,施工安全性好,措施成功率高,对低孔低渗地层具有较好的封堵作用.In view of the problem of conventional particulated inorganic plugging agent being not suitable for Wei 360 Block whichis a low permeability reservoir, an indoor comprehensive evaluation was conducted on the performance of nano-powder plugging agent.The viscosity of plugging agent fluid with density of 1.4-1.8 g/cm^3 is less than 35 mPa·s, so it has good injectivity and can enter deeppores in the formation. It also has favorable suspension property, when its density is greater than 1.6 g/cm3, the fluid does not delaminate.Its curing time can be adjusted and it can be used safely. Its initial setting time is 2.7 h to 18.5 h, and final setting time is 3.1 h to 28.1 h.After being set, its volume will not shrink, its compressive strength is over 25 MPa, and the rate of plugging is up to 99.9%. It has certainsolution property, and the recovery rate of permeability is over 50%. This paper introduces the field plugging technology, and knowledgeof key plugging points and fine operation can increase the one-time success rate of plugging. This plugging agent has been used in 27wells in Wei 360 Block of low permeability reservoir, and the technological success rate is 100%, and the effective rate of increase in oilproduction is 100%. Nano-powder plugging agent is a highly effective new plugging agent with good job safety and high success rateand can effectively seal and plug the low porosity and low-permeability formations.

关 键 词：低渗透油藏 超细油井水泥 纳米堵水剂 性能评价 

分 类 号：TE358[石油与天然气工程—油气田开发工程]