无固相低密度油基泡沫修井液性能评价与应用  

Application and Performance Evaluation of Solid-free and Low-density Oil-based Foam Workover Fluid

作　　者：王广财 钱峰 高利民 方卫荣 张云达 王小龙 刘万成 WANG Guangcai;QIAN Feng;GAO Limin;FANG Weirong;ZHANG Yunda;WANG Xiaolong;LIU Wancheng(Research Institute of Engineering and Technology, Tuha Oilfield Branch Company, PetroChina, Shanshan, Xinjiang 838202, P R of China;Exploration Company of Tuba Oilfield Branch Company, PetroChina , Shanshan , Xiajiang 838202, P R of China)

机构地区：[1]中国石油吐哈油田分公司工程技术研究院,新疆鄯善838202 [2]中国石油吐哈油田分公司勘探公司,新疆鄯善838202

出　　处：《油田化学》2017年第4期711-716,共6页Oilfield Chemistry

摘　　要：为减少清水、地层水、水基泡沫等常规水基修井液对吐哈盆地胜北油气田喀拉扎组油气藏储层的伤害,研制了一种无固相低密度油基泡沫修井液,考察了该修井液的性能并在喀拉扎组5口井进行了现场应用。结果表明,由30%地层水+70%原油+0.25%油基泡沫转化剂+0.20%油基泡沫稳泡剂+0.45%油基发泡剂组成的无固相低密度油基泡沫修井液密度在0.34~0.90 g/cm^3之间可调、泡沫强度高、泡沫稳定时间大于24 h、防漏封堵能力良好、污染岩心后的渗透率恢复率大于94%、抗温达120℃、抗压达10~11 MPa。根据油基泡沫流体特点,配套了修井工艺技术措施,该技术现场应用有效率为100%,平均每口井恢复期缩短3 d,对产层污染伤害较小,漏失量较少,修井液性能稳定,现场施工方便,成本较油基修井液低,可有效解决水敏和水锁严重的低压油气藏修井作业。In order to reduce the damages from conventional water-based workover fluids,such as water,formation water,water based foam in Kalaza group reservoir of Shengbei oil and gas field,Tuha basin,a kind of solid-free and low-density oil-based foam workover fluid was developed. The properties of workover fluid were analyzed and the workover fluid was applied on 5 wells in Kalaza group reservoir. The results showed that the density of solid-free and low-density oil-based foam workover fluid composed of 30% formation water,70% crude oil,0.25% oil-based foaming converting agent DRzh-3,0.20% oil-based foam stabilizer DRxc-2,0.45% oil-based foaming agent DRfoam-2,was 0.34—0.90 g/cm3. The foam of workover fluid had high intensity,over 24 hrs stable time and strong anti-leakage blocking ability. The permeability recovery ratio of core after polluted by workover fluid was greater than 94%. The workover fluid had good resistance of high temperature（120℃）and compressive strength（10—11MPa）. According to the characteristics of oil-based foam fluid,the complete set of workover technology measure was improved.After this technology applied in 5 Wells on site,the effective rate was 100%,and the average recovery time of each well shortened 3 days. The pollution to reservoir damage was reduced,the leakage was less,and the performance of workover fluid was stable. Furthermore,the construction on site was convenient with low cost. It could effectively solve the water sensitivity and water locking during workover operations in low pressure reservoirs.

关 键 词：无固相 低密度 油基泡沫修井液 低压油气藏 储层保护 

分 类 号：TE358[石油与天然气工程—油气田开发工程] O648.24[理学—物理化学]