低伤害低腐蚀的无固相修井液体系研制与性能评价
发布时间：2019-02-11 13:13
【摘要】：在南海西部油田修井作业过程中,修井液滤失进入地层造成储层伤害。为解决现场修井液对管材腐蚀严重、易引发黏土水化膨胀、降低储层渗透率等问题,研制了一种低伤害低腐蚀的新型无固相修井液,对黏土防膨剂、助排剂和弱酸MHA进行了筛选,确定了修井液体系的最佳配方,研究了修井液的缓蚀性和对岩心渗透率的影响。结果表明,修井液体系组成为过滤海水、5%有机盐黏土防膨剂TFB-2、0.5%黏土防膨剂HAS、1%MHA、0.5%助排剂FC310时可有效抑制黏土水化膨胀,其黏土防膨率(约90%)大于现场修井液(70%);对管材的腐蚀速率低,70℃下对钢片的腐蚀速率为1.2361 g/(m~2·h),仅为现场修井液的43.8%;新型修井液可提高岩心渗透率,处理岩心后的岩心渗透率恢复率约为110%,大于现场修井液的70%。新型修井液油水界面张力低、易于返排,可有效提高近井地带的储层渗透率,性能优于现场修井液。
[Abstract]:During workover operation in the western South China Sea oil field, reservoir damage is caused by fluid filtration into the formation. In order to solve the problems such as serious corrosion of workover fluid to pipe material, easy to cause clay hydration expansion and reduce reservoir permeability, a new type of workover fluid without solid phase with low damage and low corrosion was developed to prevent clay from swelling. The optimum formulation of workover fluid system was determined and the corrosion inhibition of workover fluid and its influence on core permeability were studied. The results show that the liquid system of workover well consists of filtered seawater, 5% organic salt clay anti-swelling agent TFB-2,0.5% clay anti-swelling agent HAS,1%MHA,0.5% drainage aid FC310 can effectively inhibit the hydration expansion of clay. The anti-swelling rate of clay (about 90%) is higher than that of workover fluid (70%). The corrosion rate of steel sheet at 70 鈩，
本文编号：2419761
[Abstract]:During workover operation in the western South China Sea oil field, reservoir damage is caused by fluid filtration into the formation. In order to solve the problems such as serious corrosion of workover fluid to pipe material, easy to cause clay hydration expansion and reduce reservoir permeability, a new type of workover fluid without solid phase with low damage and low corrosion was developed to prevent clay from swelling. The optimum formulation of workover fluid system was determined and the corrosion inhibition of workover fluid and its influence on core permeability were studied. The results show that the liquid system of workover well consists of filtered seawater, 5% organic salt clay anti-swelling agent TFB-2,0.5% clay anti-swelling agent HAS,1%MHA,0.5% drainage aid FC310 can effectively inhibit the hydration expansion of clay. The anti-swelling rate of clay (about 90%) is higher than that of workover fluid (70%). The corrosion rate of steel sheet at 70 鈩，
本文编号：2419761
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