聚铝胺盐防塌钻井液研究与应用

Research and Application of Anti-Sloughing Drilling Fluid of Poly Aluminum-Amine Salt

为解决吉林油田伊通、大安等区块软泥岩和硬脆性泥岩地层坍塌的问题,从聚胺盐与聚铝盐的抑制防塌机理出发,将两者复配,以发挥两者的协同效应提高钻井液的抑制防塌性能,结合吉林油田软泥岩和硬脆性泥岩地层钻井工程实际情况,通过试验优选其他添加剂及加量,优选出了具有强抑制性的聚铝胺盐防塌钻井液配方,其配方为2.0%钠基膨润土+2.0%封堵剂聚铝盐PAC-1+3.0%抑制剂聚胺盐HPA+1.0%降滤失剂SMP-1+1.5%降滤失剂APC-026+2.0%抑制剂磺化沥青+pH值调节剂NaOH。性能评价结果表明:强水敏泥岩在聚铝胺盐防塌钻井液中的一次回收率为75%、膨胀率为17.4%;聚铝胺盐防塌钻井液能抗15%NaCl和1%CaCl2污染,耐150℃高温。14口井的现场应用表明:聚铝胺盐防塌钻井液的抑制性和封堵能力强,能有效防止泥岩坍塌,解决了吉林油田伊通、大安等区块泥岩地层钻井过程中因井壁坍塌和缩径造成的掉块、起下钻遇阻等问题。

To solve the problem of soft mudstone and hard brittle shale formation collapse in Yitong , Da’an blocks ,Jilin Oilfield ,polyamine salt and poly aluminum salt were compounded to give full play to their synergy effect in enhancing the inhibition anti-collapse performance of drilling fluid .According to the practice of soft rock and hard brittle shale formations drilling in Jilin Oilfield ,the other additives and their dosage were optimized through experiments ,ultimately the poly aluminum amine salt drilling fluid formula with strong inhibition was obtained ：2.0% sodium base bentonite＋ 2.0% blocking agent poly aluminum salt PAC 1＋3.0% HPA inhibitors poly amine salt＋1.0% fluid loss agent SMP 1＋1.5% fluid loss agent APC 026＋2.0% inhibitors sulfonated asphalt＋ the pH regulator NaOH .Performance evaluation showed that ：strong water-sensitive shale recovery was 75% ,and swelling rate was 17.4% in poly aluminum amine salt anti-collapse drilling fluid ;and the drilling fluid could tolerate 15% NaCl and 1% CaCl2 ,temperature up to 150 ℃ .Field application results showed that ：the poly aluminum amine salts drilling fluid had strong inhibition and blocking ability and could effectively prevent the wellbore collapse when drilling through shale formation ,which solve sloughing ,drill string sticking ,and slacking due to wellbore collapse in shale formation drilling in the region .