高含硫气田湿气增压开采优化方法及其在PG气田应用

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中图分类号：TE377 文献标志码：A

Abstract：The PG gas field has been considered as thelargest high hydrogensulfide gasfield in China foritslarge proven reserves，theearliest production history，andthehighestcumulative gas production.As thegasfield enters the midleand late stagesof its development，maintaining stable production becomes aserious challenge.Pressurization or pressure enhancement isanimportant appoach tomaintainstableproductionand increasetherecoveryfactorof thegas field.However，thegas fielddevelopment hasbeenseriouslyafectedbywaterinvasionand sulfurdeposition.The productioncanbealsoaffected by theinteractionofnodes insurfacegathering process，andthegatheringcapacityofthepipelinenetwork maydecreaseafter pressurization.Conventionalmethodswere found tobedificulttoaccuratelyevaluatethepotentialof thepressurization process，withlimitations inandlingintegratedproduction，gatheringandtransportationcapacitiestojustifytechicalpolicies andpredictproduction.Inthisstudy，starting withlongcoredisplacementexperimentswithsulfurdepositionandpermeabilitydamagemeasurements，an evaluation method of abandoned presure was established considering water invasionand sulfur depositiontoclarifythepotentialforpressureenhancement.Anintegratedsimulationmodelof gasreservoir-welbore-surface gatheringand transportationconsidering sulfurdepositioninthereservoirandliquid-gasratio wasestablishedandverified with a history match accuracy of over 90% of the main production indicators. Based on the integrated simulation results，the parameters forreasonable pressure enhancement，including pressrization amplitude，timing，modeandother technical factors，are justified，andthe presure enhancementrecovery program isoptimized intermsof technology，economyandsafety. It hasbeenappliedonalargescale inthePGgas field，anditisexpected to extendthe stable production periodof the gas field by 3 years and increase the total recovery factor by 5.9% ：

Keywords：high sulfur gas field；pressurization development；abandoned pressre；optimization of technical policy

PG气田位于川东断褶带东北段，主要为构造-岩性控制的常-高压、发育边底水的特高含 ΔH2S 中含 CO2 的碳酸盐岩裂缝-孔隙型气藏。（剩余11900字）