抗硫化氢高强度冻胶阀试验研究

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1、第44卷第2期石油钻探技术Vo1．44No．22016年3月PETROLEUMDRILLINGTECHNIQUESMar．，2O16．一钻井完井doi~10．1l911／syztjs．201602011抗硫化氢高强度冻胶阀试验研究李志勇，陈帅，陶马攀，杨超(1_中国石油大学(北京)石油工程学院，北京102249；2．中国石油勘探开发研究院，北京100083)摘要：在新疆油田实施冻胶阀欠平衡钻井时，地层中富含的硫化氢气体会侵蚀破坏冻胶，影响冻胶阀的性能与使用寿命，针对此r-I~!，开展了抗硫化氢高强度冻胶阀研究。在模拟井温125℃条件下，依次筛选出了主聚

2、合物、有机交联剂、除硫剂三氧化二铁和处理剂，并对其加量进行了优选，配制了冻胶液。对该冻胶液的黏度、冻胶强度、最大可封隔压力及破胶性能等基本性能进行了评价，并利用抗硫化氢评价装置评价了硫化氢对冻胶性能的影响。评价结果显示，冻胶液黏度为50mPa·s，抗硫化氢高强度冻胶阀在125℃下3．5h后完全成胶，170h内保持冻胶性能不下降，成胶24h后每单位长度冻胶的封隔压力为0．08MPa，能有效抵抗10000mg／L硫化氢气体连续冶24h侵入，体积分数1O的破胶剂可使冻胶60min内完全破胶。研究表明，抗硫化氢高强度冻胶阀具有良好的抗温性、粘壁性和较高的承压强

3、度，能够满足含硫化氢地层欠平衡钻井安全的需要。关键词：欠平衡钻井；冻胶阀；抗硫化氢；实验室试验中图分类号：TE249文献标志码：A文章编号：1。0卜O89O(2O16)02—0065—05ExperimentalStudyonHighStrengthAnti-H2SGelValvesLIZhiyong，CHENShuai，TAOYe，MAPan，YANGChao(1．CollegeofPetroleumEngineering，ChinaUniversityofPetroleum(BeOing)，BeOing，102249，China；2．PetroCh

4、inaResearchInstituteofPetroleumExploration&Development，Beijing，100083，ina)Abstract：WhenunderbalanceddrillingiscarriedoutinXinjiangOilfield，thegeliserodedbyrichH，Sexistedintheformation，andge1valvesareseverelyaffectedbyitsworkingperformanceandlife．Inordertosolvethisproblem，aseries

5、ofstudieswereperformedwithhighstrengthanti—H2Sge1valves．Atthesimulatedwelltemperatureof125℃，mainpolymers，organiccrosslinkingagents，ferricoxide(sulfidescavenger)andadditiveswereselectedinorder，andoptimizeddosagestomakeupthege1．Experimentalevaluationwasperformedonthebasicperforman

6、ceofgelfluids，suchasviscosity，gelstrength，maximumsealingpressureandbreakingcapacity．Moreover，theeffectofhydrogensulfideongelperformancewase—valuatedbyusinganti—HSevaluationapparatus．Theresultsofevaluationshowedthattheviscosityofgelfluidwas50mPa·s，thehigh—strengthanti—HSgelvalvec

7、ouldbecompletelyformedintogelatthetem—peratureof125℃for3．5hours，andperformancekeptnochangefor170hours．Twentyfourhoursaftergelling，thesealingpressurepermeterofgelwas0．08MPa，whichcouldeffectivelyresist24hours’con—tinuousinvasionof10000mg／LH，S，anditmaybebrokencompletelywithin60minu

8、tesbyaddingthegelbreakerwithvolumefractionof10．