Study on Distribution of Low Density Proppants in Hydraulic Fracturing Operations and the Application Thereof
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摘要: 水力压裂过程中支撑剂在裂缝中铺置情况对增产效果的影响很大。研究低密度支撑剂在清水、0.08% HPG基液、0.3% HPG基液3种不同黏度的流体介质在不同排量(分别为1、2、4、6 m3/h)、不同砂比(5%、10%、15%、20%)条件下的砂堤铺置形态。通过线性拟合计算发现,随着排量增大,支撑剂的水平运移速度增大,垂直运移速度减小,支撑剂在沉降过程中出现“波动”状态;当缝口流速较小时(不大于0.5 m/s),支撑剂水平运移速度增长量较快;缝口流速较大时(大于0.5 m/s),支撑剂水平运移速度增长量减缓。目前已完成3口井低密度支撑剂现场应用试验,平均无阻流量为28.015×104 m3/d,是常规井的1.91倍,对现场施工具有良好的指导作用。Abstract: In hydraulic fracturing operations, the distribution of proppants in the fractures play an important role to the results of the stimulation job. Laboratory experiments have been conducted to study the distribution of settled sand bank of low density proppants in fresh water, in 0.08% HPG solution and 0.3% HPG solution, three solutions with different viscosity, at different flowrates (1, 2, 4 and 6 m3/h, respectively) and different sand/liquid ratios (5%, 10%, 15% and 20%, respectively). Calculating of the experimental data with linear fitting showed that the horizontal migration velocity of the proppants increases with flowrate of the liquid, contrary to the vertical migration speed of the proppants. A "fluctuation" phenomenon was observed during the settling of proppant. At low flowrate (less than or equal to 0.5 m/s) of the liquid at the opening of a fracture, the horizontal migration velocity of proppants is increasing fast. At high flowrate (greater than 0.5 m/s) of the liquid at the opening of a fracture, the increase of horizontal migration velocity of proppants is slow down. Field test have been done on three wells using low density proppants, the average open-flow capacity was 28.015×104 m3/d, 1.91 times of the flowrate of offset wells. The test results provide good guidance to hydraulic fracturing operations.
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[1] CLARK P E.Transport of proppant in hydraulic Fractures[C]. SPE 103167,2006. [2] SY/T 5108-2014,压裂支撑剂性能指标及测试推荐作法[S]. SY/T 5108-2014,Performance evaluation and recommended test methods for proppants used infracturing[S]. [3] 李树良.ULW-1.05超低密度支撑剂评价及应用[J]. 油气田地面工程,2013,32(9):66-67.LI Shuliang.Evaluation and application of ULW-1.05ultralow density proppant[J].Oil-Gasfield SurfaceEngineering, 2013, 32(9):66-67. [4] ENGELS J N, MARTINEZ E, FREDD C N,et al. A mechanical methodology of improved proppant transport in low-viscosity fluids:application of a fiber-assisted transport technique in east texas[C].SPE 91434,2004. [5] BABATUNDE AJAYI,KIRBY WALKER,KEVIN WUTHERICH,et al.Channel hydraulic fracturing and its applicability in the Marcellus Shale[C].SPE 149426, 2011. [6] 黄禹忠,何红梅,孙光权. 压裂支撑剂导流能力影响因素新研究[J]. 天然气技术与经济,2012,6(5):59-61.HUANG Yuzhong,HE Hongmei,SUN Guangquan. Influencing factors of flow conductivity for fracturing proppant[J]. Natural Gas Technology and Economy, 2012,6(5):59-61. [7] 金智荣,郭建春,赵金洲,等. 复杂条件下支撑裂缝导流能力试验研究与分析[J]. 石油与天然气学报, 2007,29(3):284-287.JIN Zhirong,GUO Jianchun,ZHAO Jinzhou,et al. Experi-mental study and analyses on flow conductivity of fracture proppant under extreme conditions[J]. Journal of Oil and Gas Technology,2007,29(3):284-287. [8] CIPOLLA C L,WARPINSKI N R,MAYERHOFER M J. Hydraulic fracture complexity:diagnosis,remediation and exploitation[C]. SPE115771,2008. [9] 温庆志,罗明良,李加娜,等.压裂支撑剂在裂缝中的沉降规律[J]. 油气地质与采收率,2009,16(3):100-103.WEN Qingzhi,LUO Mingliang,LI Jiana,et al. Principle of proppant settlementin fracture[J].Petroleum Geology and Recovery Efficiency,2009,16(3):100-103. [10] 曲占庆,黄德胜,杨阳,等.气藏压裂裂缝导流能力影响因素实验研究[J]. 断块油气田,2014,21(3):390-393.QU Zhanqing,HUANG Desheng,YANG Yang,et al. Experimental research on influencefactors of fracture conductivity in gas reservoir[J].Fault-block Oil and Gas Field,2014,21(3):390-393. [11] WARPINSKI N R,MAYERHOFER M J,VINCENT M C,et al.Stimulating unconventional reservoirs:maximizing network growth while optimizing fracture conductivity[J].Journal of Canadian Petroleum Technology,2009,48(10):1-19. [12] 蒋建方,张智勇,胥云,等.液测和气测支撑裂缝导流能力室内实验研究[J]. 石油钻采工艺,2008,30(1):67-70.JIANG Jianfang, ZHANG Zhiyong, XU Yun, et al. Laboratory researchon propping fracture conductivity based on gas loggingand liquid logging[J].Oil Drilling & Production Technology,2008,30(1):67-70. [13] CIPOLLA C L,WARPINSKI N R,MAYERHOFER M J.Hydraulic fracture complexity:diagnosis,remediation and exploitation[C]. SPE 115771,2008.
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