Filter Cake Removal Technology in the Palouge Oilfield in South Sudan
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摘要: 南苏丹Palouge油田水平井采用筛管完井，无法彻底清除筛管和井壁上的钻井液滤饼，致使油井产量达不到预期产量。为此，针对Palouge油田储层具有弱盐敏性、中度水敏性，酸敏性和碱敏性不明显的特性及该油田所用Drill-in钻井液主要由可降解的有机处理剂、碳酸钙和聚合醇组成的情况，选用酸性滤饼清除剂HBK-Lb，并优选缓蚀剂及加量，形成了酸性滤饼清除完井液。室内性能评价结果：酸性滤饼清除剂HBK-Lb对Drill-in钻井液API滤饼和筛网滤饼的清除率达到90%以上；酸性滤饼清除完井液可以清除岩心内外的滤饼；酸性滤饼清除完井液静态污染岩心的渗透率恢复率≥ 97.0%，动态污染岩心的渗透率恢复率≥ 102.3%。Palouge油田的6口油井完井时应用了酸性滤饼清除完井液，完井液漏失速度随浸泡时间增长增快，说明滤饼被清除掉，完井后单井产能与未应用酸性滤饼清除完井液的邻井相比平均增加了12.4%。研究表明，酸性滤饼清除完井液不但能解除Plalouge油田储层井壁周围的内外滤饼，而且能提高储层的渗透率。Abstract: In horizontal wells in the Palouge Oilfield,South Sudan,the filter cake of drilling fluid on the screen tube and borehole wall cannot be completely removed with screen pipes during the well completion,resulting in the inability of the well to achieve target production levels.Taking into consideration the weak salt sensitivity,moderate water sensitivity,acid sensitivity,alkali sensitivity of the Palouge Oilfield reservoir,the drill-in drilling fluids used in the oil field mainly consisted of degradable organic treating agent,calcium carbonate and polyol,the acidic remover HBK-Lb was selected,the corrosion inhibitor and its dosage were optimized to form the acidic completion fluid for removing filter cake.Indoor performance evaluation results showed that the acid remover HBK-Lb could remove API filter cake and screen cake of Drill-in drilling fluid,with a removal rate up to 90.0%.The acid completion fluid could remove filter cakes inside and outside the core.The permeability recovery rate of the core that static polluted by filter cake is higher than 97.0%,and the permeability recovery rate of the core that dynamic polluted is higher than 102.3%.The acid completion fluid for removing filter cake was applied in the six wells,the completion fluid loss rate increased with the increasing immersion time,indicating that the filter cake was removed.After completion,the well production capacity increased by 12.4% on average compared with the neighboring wells which did not use completion fluid for removing filter cake.The study demonstrated that the acid completion fluid could remove the inner and outer filter cakes around the borehole wall,and improve the permeability of reservoir in the Plalouge Oilfield.
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