凝析氣藏注入干氣滲流規(guī)律、超覆評(píng)價(jià)方法及優(yōu)化調(diào)控技術(shù)研究

凝析氣藏注入干氣滲流規(guī)律、超覆評(píng)價(jià)方法及優(yōu)化調(diào)控技術(shù)研究凝析氣藏注入干氣滲流規(guī)律、超覆評(píng)價(jià)方法及優(yōu)化調(diào)控技術(shù)研究

摘要：

凝析氣藏儲(chǔ)層不穩(wěn)定性強(qiáng)，會(huì)出現(xiàn)相態(tài)變化和滯留現(xiàn)象，導(dǎo)致開(kāi)采難度大，氣藏滲透率下降，生產(chǎn)率降低。本文針對(duì)凝析氣藏開(kāi)采中存在的問(wèn)題，進(jìn)行了注入干氣滲流規(guī)律、超覆評(píng)價(jià)方法及優(yōu)化調(diào)控技術(shù)的研究。首先，分析了凝析氣藏儲(chǔ)層特性及水-氣-油三相滲流規(guī)律，建立了干氣注入凝析氣藏儲(chǔ)層數(shù)學(xué)模型，并通過(guò)仿真分析，得出了干氣注入對(duì)凝析氣藏儲(chǔ)層壓力、相態(tài)、滲透率等的影響規(guī)律；其次，提出了基于壓力衰減及產(chǎn)氣動(dòng)態(tài)分析的超覆評(píng)價(jià)方法，有效評(píng)估了凝析氣藏的超覆特征及儲(chǔ)層性質(zhì)；最后，從長(zhǎng)周期產(chǎn)量穩(wěn)定及增產(chǎn)兩方面優(yōu)化調(diào)控了凝析氣藏開(kāi)發(fā)方案，實(shí)現(xiàn)了凝析氣藏高效開(kāi)采。

關(guān)鍵詞：凝析氣藏；注入干氣；滲流規(guī)律；超覆評(píng)價(jià)；優(yōu)化調(diào)控技術(shù)

Abstract:

Theinstabilityofthereservoirinthecondensategasreservoirwillcausephasechangeandretentionphenomenon,resultingindifficultiesindevelopment,adecreaseingasreservoirpermeability,andareductioninproductivity.Inviewoftheproblemsexistinginthedevelopmentofcondensategasreservoirs,thispaperstudiestheinjectionofdrygas,thesuperimposedevaluationmethod,andtheoptimizationandcontroltechnology.Firstly,thecharacteristicsofthecondensategasreservoirandthethree-phaseflowlawofwater-gas-oilareanalyzed.Amathematicalmodelofdrygasinjectionintothecondensategasreservoirisestablished,andthroughsimulationanalysis,theinfluenceofdrygasinjectiononthepressure,phasestate,andpermeabilityofthecondensategasreservoirisobtained.Secondly,asuperimposedevaluationmethodbasedonpressureattenuationandgasproductiondynamicanalysisisproposed,whicheffectivelyevaluatesthesuperimposedcharacteristicsandreservoirpropertiesofthecondensategasreservoir.Finally,thedevelopmentplanofthecondensategasreservoirisoptimizedandcontrolledfromthestabilityoflong-termproductionandtheincreaseinproduction,achievingtheefficientdevelopmentofthecondensategasreservoir.

Keywords:condensategasreservoir;drygasinjection;seepagelaw;superimposedevaluation;optimizationandcontroltechnologyInrecentyears,thedevelopmentofcondensategasreservoirshasgainedincreasingattentionduetotheirhighvalueandpotential.However,duetothecomplexityofthereservoirpropertiesandtheproductionmechanisms,theefficientdevelopmentofcondensategasreservoirsisstillachallengefortheoilandgasindustry.

Toaddressthischallenge,theuseofdrygasinjectionhasbeenproposedasaneffectivewaytomaintainreservoirpressureandimproveproductionperformance.Drygasinjectioncanpreventcondensateblockageandenhancetherecoveryofcondensategas,whichisbeneficialfortheefficientdevelopmentofthereservoir.

Moreover,theseepagelawofthecondensategasreservoirneedstobethoroughlyunderstoodtoaccuratelyevaluateitssuperimposedcharacteristicsandreservoirproperties.Thesuperimposedevaluationcanhelpoptimizeandcontrolthedevelopmentplanofthecondensategasreservoirforstablelong-termproductionandincreasedproduction.

Insummary,theoptimizationandcontroltechnologyofcondensategasreservoirsinvolvesdrygasinjection,theunderstandingofseepagelaws,andthesuperimposedevaluationofreservoirproperties.TheseeffortscanleadtoefficientandsustainabledevelopmentofcondensategasreservoirsApartfromtheaforementionedtechnologies,thereareseveralotherapproachesthatcanbeimplementedtooptimizeandcontrolthedevelopmentofcondensategasreservoirs.Theseincludetheuseofhorizontaldrilling,artificiallift,selectivecompletion,andhydraulicfracturing.

Horizontaldrillingisaneffectivetechniquethatcanincreasetheexposureofthewellboretothereservoir,therebyenhancingproductionrates.Thismethodinvolvesdrillingawellborethatdeviatesfromtheverticalaxisandextendshorizontallythroughthereservoir.Bydoingso,thewellborecanintersectmorefracturesandchannelsinthereservoir,therebyincreasingthecontactareaforgascondensationandproduction.Horizontaldrillingcanbecoupledwithotherreservoirstimulationtechniquessuchashydraulicfracturingtoenhancetherecoveryofgascondensate.

Artificialliftisanothertechniquethatcanbeemployedtoincreasetheflowrateofcondensategaswells.Thismethodinvolvesintroducingenergyintothewellboretopushthefluidstowardsthesurface.Commonartificialliftmethodsusedincondensategasreservoirsincludegaslift,electricsubmersiblepumps,andbeampumps.Applyingartificialliftcanmitigatethedeclineinreservoirpressureandmaintainlong-term,stableproduction.

Selectivecompletionisanimportanttechniquethatcanoptimizewellperformanceinmultiple-layeredcondensategasreservoirs.Thismethodinvolvesorganizingtheperforationsandplacementofsandscreensinthecompletiondesigntocontroltheflowoffluidsfromdifferentlayers.Throughproperengineeringanddesign,selectivecompletioncanhelppreventprematurewaterbreakthroughandenhancetherecoveryofcondensategas.

Finally,hydraulicfracturingisacommontechniquethatisappliedtoincreasetheproductivityofcondensategasreservoirs.Thismethodinvolvesinjectinghigh-pressurefluidintothereservoirtocreateartificialfracturesandchannelsintherock.Thesefracturesandchannelscanenhancethepermeabilityoftherockandincreasetheflowofcondensategastothesurface.

Inconclusion,optimizingandcontrollingthedevelopmentofcondensategasreservoirsrequiresaholisticapproachthatinvolvesacombinationofadvancedtechnologiesandtechniques.Asreservoirconditionsvaryamongdifferentfields,thechoiceandapplicationofthesemethodsshouldbetailoredtothespecificreservoircharacteristicsandproductionconditions.Byimplementinganoptimalandcontrolleddevelopmentplan,wecanmaximizethepotentialofcondensategasreservoirsandachievesustainable,long-termproductionOnekeyfactorinthedevelopmentofcondensategasreservoirsisthedeterminationofreservoirpropertiesandcharacteristics.Thisinvolvescomprehensivereservoiranalysisandmodeling,whichcanhelpinidentifyingtheoptimalwelllocations,wellspacing,andcompletionstrategies.Theinformationderivedfromreservoirmodelingcanalsohelpinpredictingthewellperformanceandproductionpotential.

Drillingandcompletionstrategiesplayacrucialroleinthedevelopmentofcondensategasreservoirs.Horizontaldrillingcoupledwithmulti-stagehydraulicfracturinghasprovedtobeaneffectivetechniqueinenhancingproductionfromthesereservoirs.Theapplicationofthesetechniquesalsorequiresefficientproductionfacilities,includinghigh-pressureseparators,compressors,andcondensatestabilizationunits.Theproductionfacilitiesshouldbedesignedtohandlelargevolumesofcondensategas,sothatitcanbetransportedviapipelinestodownstreamprocessingunits.

Inadditiontodrillingandcompletionstrategies,productionmanagementisalsocrucialforthesuccessfuldevelopmentofcondensategasreservoirs.Thisinvolveseffectivereservoirmonitoring,whichcanhelpinidentifyinganychangesinreservoirperformance,recoveryefficiency,andwaterbreakthrough.Advancedmonitoringtechniquessuchasdownholepressureandtemperaturesensors,distributedtemperaturesensing,andpermanentdownholegaugescanprovidevaluableinsightsintoreservoirbehaviorandperformance.

Environmentalconsiderationsarealsoimportantinthedevelopmentofcondensategasreservoirs.Asthesereservoirsareoftenlocatedinsensitiveecosystems,itisessentialtoimplementproperenvironmentalmanagementpracticestominimizetheimpactofdrillingandproductionactivities.Measuressuchassurfacewatermanagement,erosioncontrol,andwastemanagementshouldbecloselymonitoredandmanagedtoensurecompliancewithregulatoryrequirements.

Finally,itisimportanttonotethatthedevelopmentofcondensategasreservoirsrequiresacollaborativeapproachthatinvolvesallstakehol