不同物性储层砂岩出砂力学响应研究

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1、不同物性储层砂岩出砂力学响应研究摘要：储层砂岩是由砂岩颗粒胶结而成的沉积岩，同一区域的物性特征不尽相同，油藏开采时的地层响应和出砂也会有差异。以2种不同的储层砂岩为研究对象，基于柱坐标系的三维颗粒流数值模型，模拟射孔围压和油藏流速一定时的砂岩宏细观力学响应，分析出砂的发生和发展过程。砂岩的宏观应力曲线表明砂岩颗粒间的弱胶结性越弱，胶结物质含量越少，砂岩越容易屈服破坏，出砂越容易。砂岩的黏结应力分布同样说明储层的砂岩颗粒越小、胶结含量和胶结程度越小，离散的颗粒越多，颗粒接触上的受力越大，砂岩破坏越严重，出砂的几率越大；同时，颗粒的位移和旋转也说明胶结物质对储层砂岩力学特性和出砂

2、的影响较大，与上述研究成果一致。储层开采中，不同物性的储层砂岩力学响应不同，出砂特性有差异，需要针对实际的储层物性和赋存环境，采用适宜的出砂预测方法和防砂手段。关键词：储层砂岩；出砂；三维颗粒流程序；力学响应;不同物性中图分类号：TU45文献标志码：A文章编号：16744764(2014)02002807Abstract:Thereservoirsandstoneisthesedimentaryrockwithmanycementedsandparticles・Thedifferentphysicalpropertyofthereservoireveninthesameare

3、aresultsindifferentmechanicalresponseandsandproductionofthesandstone・Takingtwotypesofthereservoirsandstonesasresearchsubjects,anumericalmodelbasedon3DimensionalPartidebasedDistinctElement(PFC3D)undercylindricalcoordina.tesystemwasusedtoSimulatethemicromicroresponseofthesandstoneconsideringt

4、hegivenconfiningpressureandtheoilflowrate.Meanwhile,thesandinginitiationandtheprocessofthedevelopmentwereanalyzed.Themacrostressindicatedthatthereservoirsandstoneswithweakercementedsandparticlesandlesspercentofthecementedmaterialswouldyieldandfailmoreeasily,thesandproductionwasinitiatedmore

5、easilyaswelLMeanwhile,thestressoftheparallelbondsindicatedthatthereservoirsandstoneswithgranuleandlesscementedmaterialsdislodgedfromthesandstonemoreeasily,andtheforceontheparticlecontactwaslargerandthesandstonefailurewasmoreserious.Hence,theprobabilityofthedislodgedparticlesflowingintothewe

6、llborewasalsomuchmore・Inaddition,theparticledisplacementandrotationindicatedthatthephysicalpropertyofthesandstoneplayedasignificantinfluenceonthemechanicalresponseandthesandproduction,theresultsalsoagreedwiththeaboveresuIts.Therefore,thesandmechanicalresponseandsandproductionofreservoirsand

7、stonearebothdifferentduetodifferentphysicalpropertyofthereservoir.Asaresult,thereliablemeasuresofthesandpredictionandsandcontrolwillbeadoptedbasedonthereservoirphysicalpropertyandconditions・Keywords：reservoirsandstone；sandproduction；3Dimensionalpartideba