自适应屏蔽暂堵钻井液技术.pdf

2008年第32卷 中国石油大学学报(自然科学版) V01．32No．2 of JournalChina ofPetroleum 第2期 University Apr．2008 文章编号：1673-5005(2008)02-0068-04 自适应屏蔽暂堵钻井液技术 吕开河，邱正松，王在明 (中国石油大学石油工程学院，山东东营257061) 摘要：针对油层非均质性强及油层孔径难以准确预知等特点，采用自适应屏蔽暂堵剂ZPJ配制成自适应屏蔽暂堵钻 井液，该钻井液能在无须明确预知孔喉直径的情况下，自适应封堵岩石表面较大范围的孔喉，对较宽孔径分布的油 层具有很好的暂堵作用。室内评价结果表明，该钻井液的渗透率堵塞率接近100％，暂堵带强度大于9MPa；反排渗 透率恢复率超过90％，油层保护效果较好。 关键词：自适应；屏蔽暂堵；钻井液；油层保护；渗透率恢复率 254 中图分类号：TE 文献标识码：A of and fluid Techniquesauto-adaptingshieldingtemporarypluggingdrilling LU Kai—he，QIUZheng—song，WANGZai—ming inChina (CollegeofPetroleumEngineeringUniversityofPetroleum，Dongying257061，ShandongProvince，China) atthe distribution radiusof Abstract：Aimedsevere radius and heterogeneity，widepore unpredictablepore reservoir，the and fluidwas ZPJ．This fluidcan reservoir auto—adaptingshieldingtemporarypluggingdrilling developedusing drilling plug for underconditionofunknownradiusandhas effectreservoirwithwide radiusdistil— pore pore goodtemporaryplugging pore bution．Thelabevaluationresultsshowthatthe ratioofthe fluidisnear100％andthe permeabilityplugging drilling strength above9 flowforthe fluid isa- of heltis MPa．Theratioof restoredback temporaryplugging permeabilityby drillingsystem bore90％．and reservoir effectisobtained． good