【摘要】：在南海西部油田修井作業(yè)過程中,修井液濾失進入地層造成儲層傷害。為解決現(xiàn)場修井液對管材腐蝕嚴(yán)重、易引發(fā)黏土水化膨脹、降低儲層滲透率等問題,研制了一種低傷害低腐蝕的新型無固相修井液,對黏土防膨劑、助排劑和弱酸MHA進行了篩選,確定了修井液體系的最佳配方,研究了修井液的緩蝕性和對巖心滲透率的影響。結(jié)果表明,修井液體系組成為過濾海水、5%有機鹽黏土防膨劑TFB-2、0.5%黏土防膨劑HAS、1%MHA、0.5%助排劑FC310時可有效抑制黏土水化膨脹,其黏土防膨率(約90%)大于現(xiàn)場修井液(70%);對管材的腐蝕速率低,70℃下對鋼片的腐蝕速率為1.2361 g/(m~2·h),僅為現(xiàn)場修井液的43.8%;新型修井液可提高巖心滲透率,處理巖心后的巖心滲透率恢復(fù)率約為110%,大于現(xiàn)場修井液的70%。新型修井液油水界面張力低、易于返排,可有效提高近井地帶的儲層滲透率,性能優(yōu)于現(xiàn)場修井液。
[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，

本文編號：2419761