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柱状支撑裂缝内流体流动规律
卢聪,卢云霄,李芝力,陈滔,郭建春,蒋宝云
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(1.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500;2.中国石化胜利石油工程公司井下作业公司,山东东营257000;3.中国石化西南油气分公司采气四厂,重庆402160;4.中国石化胜利油田鲁明油气勘探开发有限公司,山东东营257000)
摘要:
通道压裂通过脉冲交替泵入含支撑剂的携砂液和不含支撑剂的中顶液,在人工裂缝中形成非均匀柱状支撑结构的不连续铺置,从而在裂缝中形成流体流动的高速通道。目前对于支撑剂团在地层闭合压力作用下的变形规律尚认识不清,导致对支撑裂缝宽度的变化规律认识不明,从而难以准确计算支撑裂缝导流能力。根据大型可视化平板支撑剂运移铺置实验结果,统计分析支撑剂团铺置形态及尺寸,将支撑剂团分为3类。通过实验模拟支撑剂团柱的压缩变形过程,得到不同闭合压力下支撑剂团柱高度变化规律和支撑剂团杨氏模量。采用光滑粒子法,将支撑剂团柱离散成具有实际质量与体积的颗粒;采用有限元法将地层进行离散;通过两者耦合接触算法,对支撑剂团柱与地层的接触进行耦合计算;根据平板实验抽提的支撑剂团柱尺寸,建立3种类型的支撑剂团柱与地层接触模型;继而获取不同地层闭合压力与岩石杨氏模量下的支撑剂团柱压后形态、法向应力以及支撑剂团柱高度等参数,研究支撑剂团柱变形规律。采用计算流体动力学方法,建立支撑剂团柱-裂缝的缝内流动模型,计算得到不同施工参数下的压力场和速度场。
关键词:  通道压裂  支撑剂团柱  光滑粒子法  流动特征  压力分布  支撑剂铺置
DOI:10.13673/j.cnki.cn37-1359/te.2019.04.017
基金项目:国家科技重大专项“低渗砂岩储层提高压裂裂缝复杂程度工艺技术研究”(2016ZX05006-002),国家自然科学基金项目“深层高应力下页岩缝网压裂裂缝流动机制及导流能力预测模型”(51704251)。
Fluid flow pattern in fractures supported by proppant pillars
LU Cong,LU Yunxiao,LI Zhili,CHEN Tao,GUO Jianchun,JIANG Baoyun
(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China;2.Downhole Company,SINOPEC Shengli Petroleum Engineering Company,Dongying City,Shandong Province,257000,China;3.No.4 Gas Production Plant,SINOPEC Southwest Oil & Gas Company,Chongqing City,402160,China;4.Luming Oil-Gas Exploration & Development Co.,Ltd.,SINOPEC Shengli Oilfield,Dongying City,Shandong Province,257000,China)
Abstract:
Proppant slurry and the clean fluid are alternately pumped through pulses during channel fracturing to form a discontinuous placement of non-uniform support structures in the artificial fractures,and high-speed channels of fluid flowing could be formed in the fractures. However,the understanding of the deformation law of the proppant pillar under the formation closure pressure is unclear,resulting in an indefinite understanding of the variation rule of the fracture width,and therefore it is difficult to accurately calculate the flow conductivity of the fracture with proppant. According to the results of large-scale visualized plate proppant migration and placement experiment,placement pattern and size of the proppant pillar were analyzed,and the proppant pillars were divided into three types. The compression deformation process of the proppant pillars was simulated,and the thickness variation law and Young’s modulus of the proppant pillars under different closure pressure were obtained. The proppant pillar was dispersed into particles with actual mass and volume by the smoothed-particle hydrodynamics(SPH). The formations are dispersed by finite element method,and their contact with the proppant pillar was calculated based on the coupling contact algorithm. Based on the size of proppant pillar extracted by plate experiment,three types of formation fracture-proppant pillar contact models were proposed. Deformed state,normal stress and height of the proppant pillar under different formation closure pressure and Young’s modulus were obtained to study the deformation law of proppant pillar. Finally,the fracture-proppant pillar flow model was proposed to study the pressure and velocity field under different construction parameters by CFD.
Key words:  channel fracturing  proppant pillar  smoothed-particle hydrodynamics  flow characteristics  pressure distribution  proppant placement pattern

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