抗盐聚合物钻井液在鲁迈拉油田R-504井中的应用

R-504井是中石油伊拉克分公司部署在鲁迈拉油田的第1口生产井,完钻井深3 436 m,钻井目的是开发Zubair油层。该油层段地层结构复杂,漏失现象普遍存在,在钻井过程中容易出现井壁失稳、卡钻及漏失井涌等复杂情况。经过大量的室内实验和现场试验,确定使用抗盐聚合物钻井液体系。现场应用表明,抗盐聚合物钻井液体系流变性好,抑制能力和抗温能力较强。针对鲁迈拉地区有多个压力体系特点,复杂事故处理难度大,制定了操作工艺相对较简单的堵漏预防及事故处理措施,大幅度降低了钻井周期。

Application of salinity resistant polymer drilling fluid on Well R-504 in Lumaila Oilfield

Well R-504 is the first producer in Lumaila Oilfield deployed by CNPC Iraq Branch,with completion depth of 3436m and the target layer of Zubair.The geological structure of the target formation is complicated with existing drilling fluid loss,so wellbore unstability,bit freezing,and fluid loss are tend to happen.Through a number of lab experiments and field tests,the drilling fluid is determined to be salinity resistant polymer system.The application proves that the reology of the fluid is good,and it has strong inhibition and temperature stable ability.According to the characteristics of multi pressure system in Lumaila area and large difficulty of dealing with complex accidents,the treatments of easily loss plugging and accident handling are programmed,which greatly decreases the drilling lifetime.