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盐井定向施工中固井问题处理及分析
Title:WellCementingProblemResolutionandAnalysisinSaltCavernDirectionalDrilling
Abstract:
Oilandgasextractionfromsaltcavernsrequiresuniquedrillingandwellboreconstructiontechniquesduetothechallenginggeologicalconditions.Oneofthecriticalstepsinthisprocessiswellcementing.Thispaperaimstoanalyzetheproblemsencounteredduringwellcementinginsaltcaverndirectionaldrillingandprovidesolutionstoensurewellboreintegrityandlong-termproduction.
Introduction:
Saltcaverndirectionaldrillinginvolvesdrillingandcompletingwellsinsaltformations,whichposeseveralchallengesduetotheirhighporosity,permeability,andwater-solublenature.Wellcementingplaysacrucialroleinmaintainingwellboreintegrity,preventingfluidmigration,andsecuringtheproductionzone.However,thecomplexgeologicconditionsandthespecificchallengesassociatedwithsaltcaverndrillingcanleadtocementingproblems.
CementingProblems:
1.SaltCreep:Saltcreepisaphenomenonwheresaltformationsexertpressureonthecementsheathovertime.Thiscanleadtocementsheathfailure,lossofzonalisolation,andpotentialfluidmigration.Inextremecases,itcancausecasingcollapse.Thehightemperatureandpressureconditionsinsaltcavernsexacerbatethisproblem.
2.FluidMigration:Duetothewater-solublenatureofsaltformations,thereisariskoffluidmigrationthroughthesaltstrata,compromisingwellintegrityandcontaminatingtheproductionzone.Poorcementjoborimpropercasingdesigncancontributetofluidmigration.
3.ThermalStress:Saltcavernsexperiencesignificanttemperaturechangesduringproductionandinjectioncycles.Thesethermalchangescaninducestressonthewellboreandthecementsheath,leadingtocracks,leaks,andlossofzonalisolation.
4.MechanicalFactors:Thehighporosityandpermeabilityofsaltformationscanmakepropermudremovalchallengingduringdrilling,leadingtopoorcementbondquality.Additionally,theabrasivenatureofsaltcancausecasingwearanddamage,furthercompromisingcementintegrity.
SolutionsandAnalysis:
1.SaltCreepManagement:Tomitigatesaltcreep,itisessentialtodesignthecementsheathwithappropriatecasingcentralizationan