围压和轴压对液电脉冲等离子体破岩效果影响规律的计算模型

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中图分类号：TE242 文献标志码：A

Abstract：Electro-hydraulicpulseplasmaisconsideredtobeanewandeficientrockbreakingtechnology.However，thereis currentlyalackofresearchonitsrock breakingeffectunderthebottom-holeconditions inoilandgaswelldriling.Inthis study，therockbreaking effectof electro-hydraulicpulseplasmaunderdifferentconfiningandaxial pressureswas studied by experimentsand stress wave modeling.Acalculation modelforthedistributionofstresswaves insiderocksunderelectro-hydraulicpulseplasma was established，andthedistributioncharacteristicsof stresswavepeaks in graniterock samples were analyzedfortheverificationof themodel.Couplingwiththeexperimentaltestingoftheultrasonicparameterswithgranite， shale，andsandstonerocksamplesunderdiferentconfiningandaxialpressures，theinfluenceofconfiingandaxialpressures onrock breaking efectbythe electro-hydraulic pulse plasma wasobtained.Theresults showthatcompressive，shear， andtensile stressescanocur simultaneously insidetherock sample under the impact of the electro-hydraulicpulseplasma shockwave，andtheinfluenceofaxial pressureonrock breaking isgreaterthanthatoftheconfining presure.Whentheconfining pressureandaxialpressreincrease，thepeakstresswaveinsidetherockalsoincreases，indicatingthattheelectrohy draulic pulse plasma can also have good effectson rock breaking underreal downhole driling conditions.

Keywords：electro-hydraulic effect；plasma；stress wave；calculation model；rock-breaking

随着油气勘探开发逐渐向深层、超深层发展，如何提高岩石破碎效率、降低钻井周期是钻井领域面临的关键问题之一[1-4]，因此对于高效破岩新方法的研究具有重要意义。（剩余10933字）