高温高压气井酸性气体溢流运移规律

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中图分类号：TE28 文献标志码：A 文章编号：1000-7393（2025）-02-0168-11

Abstract： Mostof teultradepgas wels inChinaarehightemperature，highpressureandhighsulfur.Theproblemssuchasunclear blowoutmechanismofacidgaswellsanddificult wellore presure inversionlead to geatchallngesinwellcontrol.Inoderto revealthecauses of acid gas wellblowout and clarifytheinfluenceof diferentacidgascontent on annulus fluidflow，this paper considers the influenceof solubilityand phase state changeonthe physical properties ofacid gas，uses the methodofquasicritical parameters insteadofcrticalparameterstoanalyzethevariationlawsofgasdnsityandsolubilityalong welldepthandetablishes an acid gas anulus flow model with dissolution phasechange effct.Four point diference was usedtoconstruct agrid solution modeltoexploreteflowcharacteristicsofanulargasafteroverflow，andthedistributionlawsofphysicalpropertiesofacidgas， wellbore pressre，tmperatureandotherparameterswithwelldepthwerediscussedTheresultsshowthathephysical propertiesof acidgaschangesignificantlywith welldepth： themoreacidgas inthe welbore，thesmalerthedeviation factor，the greaterthe density and viscosity， and the parameter changes near the pseudo critical point are more than 40% ; Compared with pure methane， the volume expansion of mixed fluid containing acid gas near the wellhead exceeds 20% ，and the flow rate increasesbymore than 10% resultinginincreasedwellcontrolrisk.Thestudyclarifiedthemigrationlawofacidgasoverflowinightemperatureandhigh presure gas wels，whichhas guiding significanceforoptimizingwellcontrol design，improving wellcontrolemergencyplan，nd formulating well killing measures.

Keywords：exploationdevelopnt;eeuitgegtecoloydrilln;setyepleoid

0 引言

酸性气体含量较高的天然气资源在我国分布广泛、资源量巨大，主要集中在四川盆地和塔里木盆地，如四川的普光气田和龙岗气田［1]，塔里木油田的塔中、轮古作业区等［2]。（剩余16330字）