CB3-3井低产分析及对策  

ANALYSIS AND COUNTERMEASURES OF CB3-3 WELL LOW PRODUCTION CAUSES

作　　者：董宏伟[1,2] 吴满祥[1,2] 崔贵涛[1,2] 董海东[1,2] 蒋振伟[1,2] 陈龙[1,2] 许建生 

机构地区：[1]低渗透油气田勘探开发国家工程实验室 [2]川庆钻探公司钻采工程技术研究院 [3]中石油长庆油田分公司第二采油厂

出　　处：《钻采工艺》2015年第5期38-40,8,共3页Drilling & Production Technology

基　　金：中国石油天然气集团公司科研项目"解除长庆上古低渗砂岩气层钻井液伤害的洗井液研究"(编号:CQ2013B-12-1-3)

摘　　要：长北气田本着安全环保的理念,近年来不断重复使用低伤害钻完井液(DIF),使得一些不易清除的黏土颗粒不断在钻井液中积累,导致钻井液中分散黏土含量(MBT)不断升高,在液柱的高压差下,使钻井液中分散很细的黏土微粒进入储层,使储层孔隙进一步缩小,水锁加剧,导致产量降低。针对这一难题,主要从改变储层表面性质着手,研制出了洗井液NDF-1,该洗井液使低渗砂岩气藏由强亲水变为弱亲水,消除储层毛管力,溶解进入部分固相,拆散堵塞,从而提高气驱水效率,消除固相伤害。室内试验表明,洗井液NDF-1可以使现场DIF伤害后岩心渗透率恢复率得到明显提高,效果优于酸液,并且可以完全克服室内配制DIF钻井液给岩心造成的伤害。The producibility of CB3-3 Well in Changbei gas field was lower.The reasons resulted in low production were analyzed,i.e.the DIF drilling fluid was always reused in recent years,that caused clay particles accumulation and dispersive clay content(MBT) increase in the drilling fluid,some small bentonite particles were easy into the reservoir in high pressure difference of the drilling fluid column,which caused the reservoir pore further reduced and serious water lock.In order to solve the problem,flush fluid NDF-1 was developed.The flushing fluid could make low permeability gas reservoir change from the strong hydrophilicity to weak hydrophilicity,eliminate reservoir capillary force and remove some solids from the reservoir.Therefore,the gas water flooding efficiency was enhanced.The experimental results showed that NDF-1 flushing fluid could enhance permeability recovery rate of the core obviously that was damaged by reusing DIF drilling fluids,and the effect was better than that of acid liquid,and still completely remove the damage of core that caused by the new DIF drilling fluid.

关 键 词：长北气田 水平井 储层钻井液 储层伤害 洗井液 

分 类 号：TE258.3[石油与天然气工程—油气井工程] TE32