摘要
针对低压易漏油藏修井作业的需要,研究出一套新型的低密度微泡沫修井液,体系由新型发泡剂、活性剂、复合稳泡剂等处理剂配制而成,其中的微泡具有一核、两膜、三层的结构,稳定性较高。性能评价结果表明,该微泡沫防漏修井液抗温达130℃,抗压达10 MPa,API滤失量仅为10.3 mL,高温高压滤失量仅为15.6 mL,抗盐可达10%,抗钙可达3%,抗油污在15%以上,岩心渗透率恢复率在89%以上,该修井液不仅可以降低液柱压力,减小压差,而且形成的微泡在漏失区域大小分布广泛,具有一定的强度和韧性及可变形性,能够自匹配漏失通道,从而达到防漏的目的。该技术在现场应用5井次,有效率为100%,平均每口井恢复率为133.8%,平均每口井恢复期缩短1.6 d,油层保护效果明显,可用于易发生严重漏失的低压油藏的修井作业。
Akind of novellow-density micro-foam workover fluidis developed for low pressu rereservoirs,which is composed of foaming agent,active agent and compound foam stabilizing agent,and the micro-foam is formed by one core two films and three layers that is very stable.The experimental evaluation results show that this kind of workover fluid can work in conditions of 130 ℃ and 10 MPa,and has good performances of API filtrate loss 10.3 mL,HTHP filtrate loss 15.6 mL,salt tolerance 10%,calcium tolerance 3%,oil tolerance over 15% and core permeability recovery rate over 89%,as well as the micro-foam can match the leakage ways automatically to prevent lost circulation.The applications of 5 wells are succeeded in 100%,the average recovery rate is 133.8%,and the average recovery time is shorten by 1.6 d,which can protect reservoirs effectively.
出处
《钻井液与完井液》
CAS
北大核心
2013年第1期22-25,90-91,共4页
Drilling Fluid & Completion Fluid
基金
大港油田公司课题"保护油气层修井液技术研究与应用"(75k000041)
关键词
低密度修井液
微泡沫修井液
防漏
发泡剂
稳泡剂
Low-density workover fluid
Micro-foam wordover fluid
Preventing lost circulation
Foaming agent
Foam stabilizing agent
