深水钻井溢漏同存条件下温压分析及溢漏层位判别

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中图分类号：TE21 文献标志码：A

Abstract：Indeep waterdrilling，，therearechallenges toworkoutthetemperatureandpressure variation pattrns inwellboreand itisdificult todeterminethegas influx（overflow）anddrllingfluidlosspositions，especiallyunderthecomplex coexistence ofoverflowandloss conditions.Inthis study，atransient wellore temperatureand pressure modelunderthe coexistenceofoverflowandcirculationlossconditionswasestablished，basedonheat transferanalysisandaccounting for theimpactof variable massflowinwellbore annuluson temperatureandpressurechanges.Theanalysisof thegas influx andcirculation losscoexistence was conductedbydefiningandcalculating thetemperatureand pressure diferences along theanulus.Thesimulationresults indicate thatthetemperature diferenceis generall greaterunder theconditionofupper gasinfluxandlower circulationloss positions compared tothat with upper circulationlossand lowergas influx，while the pressure diference is generally greaterunder theconditionof upper circulationlossand lowergas influx compared to upper gas influxandlower circulation loss．Anabrupt changeofannular temperature diferenceinanopen hole section mostly corresponds toagas influxposition，whileatransitioninannulartemperaturediferenceinanopenholesectioncorsponds toacirculationlossposition.Alarger initial gas invasion pressurediferencecanresult inagreaterannular temperature diferenceatthewellhead.Astheinitial circulationlosspressurediffrenceincreases，theannulartemperaturedifference at thewellhead decreases.

Keywords：dep waterdrillng；coexistenceof gas influxandcirculationloss；welbore temperatureand pressure prediction; determination of gas influx and circulation loss positions

随着油气资源勘探开发进程的推进，深水区域已经成为了油气资源开发的主战场之一[1-2]。（剩余13499字）