靖边气田废弃钻井液评价及处理方法研究
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2020-03-07 10:34:20
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第51卷2015年第1期Vo1.512O15No.1西北师范Journa1ofNorthwest大学学报NormalUniversity(自然科学版)(Natura1Science)91靖边气田废弃钻井液评价及处理方法研究张明,李天太。,晏宁平。(1.中国石油大学石油工程学院,北京102249;2.西安石油大学石油工程学院,陕西西安710065;3.长庆油田公司第一采气厂,陕西西安718500)摘要:针对靖边气田聚磺体系废弃钻井液的污染特点,通过室内实验分析评价了废弃钻井液的稳定性、可混凝性及析出水水质,研究了废弃钻井液复合固化处理的工艺,确定了废弃钻井液的处理方法.结果表明,靖边气田废弃钻井液具有较好的稳定性和可混凝性,处理时可加入带正电性絮凝剂以实现固液分离;不同舍固率的废弃钻井液需对破胶剂的加量进行优化;含固率越高,破胶时间越长,开始出水时间均在10h以上;析出水主要污染指标为C0D,去除COD最优加药量为l_2g·L;采用无机复合固化剂处理效果较好,加药处理后浸出液各项指标均达到GB8978—1996的二级排放标准.关键词:废钻井液;COD去除;破胶剂;固化处理;靖边气田中图分类号:TE992.2文献标志码:A文章编号:1001—988X(2015)01—0091一O6Evaluationandtreatmentofwastedrillingfluidtreatment‘JingbiangfieldiuidtreatmentinlngbiangasfieldZHANGMing,LITian—tai。,YANNing—ping。(1.InstituteofPetroleumEngineering,ChinaUniversityofPetroleum,Beijing102249,China:2.InstituteofPetroleumEngineering,Xi’anShiyouUniversity,Xi’an710065,Shaanxi,China;3.TheNo.1GasProductionPlant,ChangqingOilFieldCompany,Xi’an718500,Shaanxi,China)Abstract:InresponsetothepollutioncharacteristicsofthewastepolysulfidedrillingfluidsofJingbiangasfield,thestabilityandcoagulationofwastedrillingfluidwareevaluated,andthequalityofprecipitationwaterwasanalysed.Thecompositecuringprocessingtechnologyofwastedrillingfluidwasstudied.Themethodofdealingwiththewastedrillingfluidwasdetermined.TheexperimentalresultsshowthatthewastedrillingfluidofJingbiangasfieldhasgoodstabilityandcoagulation,SOinordertorealizethesolid—liquidseparation,thepositivelychargedflocculatingagentcanbeaddedintodrillingfluids.Differentsolidcontentofwastedrillingfluidneedstooptimizebyaddingthdamountofgelbreaker.Thehighersolidcontent,thelongertimetogelbreakingneed,thetimeofwaterprecipitateismorethan10h.ThekeypollutionindicatorofprecipitationwaterisCOD,andtheoptimaldosageis1.2g·L~ofCODremova1.Theeffectisgoodwhenusinginorganiccompositecuringagenttreatment,alltheindexesoflixiviumafterthetransactionofaddingmedicinecanmeetthenationalstandard(GB8978-1996).Keywords:wastedrillingfluid;CODremoval;breakers;solidificationtreatment;Jingbiangasfield收稿日期:2014—03—20;修改
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