孔隙压力对砂岩岩石力学特性影响试验
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摘要
揭示低渗透油气藏长期注水过程中动态裂缝的成因机理,首先要搞清孔隙压力对储层岩石力学性质的影响规律。利用美国GCTS公司RTR-1500高温高压岩石力学测试综合系统进行试验,研究灰褐色油斑细砂岩、细砂岩、钙质细砂岩3种岩样在不同孔隙压力条件下岩石力学性质的变化规律,分析不同岩性的抗压强度、弹性模量、泊松比、声波变化等参数的变化趋势。研究表明:这3种岩样的抗压强度、弹性模量和纵波速度均随孔隙压力增大而减少,泊松比变化无明显规律;随着孔隙压力的增大,岩样弹性阶段减短,塑性阶段增长;二项式可以很好地拟合孔隙压力与抗压强度的关系。
In order to explore the genetic mechanism of the dynamic fracture in the low-permeability oil-gas reservoirs under the prolonged water injection development, first of all, the influencing law of the pore pressure on the mechanical properties of the rock must be ensured. With the help of RTR-1500 comprehensive system of the rock mechanics test with high temperature and high pressure from America GCTS Company, the test was conducted to research the changed laws of the mechanical properties of the following three rock samples: grayish-brown oil-speckle fine sand, fine sand and calcareous fine sand under different pore pressures, and moreover analyze the varied trends of the parameters including the compressive strength, elasticity modulus, Poisson's ratio, sonic change and so forth for different lithologies. The study shows that for the three rock sample stated above, with the rise of the pore pressure, the compressive strength, elasticity modulus and longitudinal wave velocity reduce, while Poisson's ratio has no obvious change; with the increase of the pore pressure, the rocks become a little shorter in the elasticity stage, while in the stage it prolongs; the binomial equation can well match the relationship between the pore pressure and the compressive strength.
In order to explore the genetic mechanism of the dynamic fracture in the low-permeability oil-gas reservoirs under the prolonged water injection development, first of all, the influencing law of the pore pressure on the mechanical properties of the rock must be ensured. With the help of RTR-1500 comprehensive system of the rock mechanics test with high temperature and high pressure from America GCTS Company, the test was conducted to research the changed laws of the mechanical properties of the following three rock samples: grayish-brown oil-speckle fine sand, fine sand and calcareous fine sand under different pore pressures, and moreover analyze the varied trends of the parameters including the compressive strength, elasticity modulus, Poisson's ratio, sonic change and so forth for different lithologies. The study shows that for the three rock sample stated above, with the rise of the pore pressure, the compressive strength, elasticity modulus and longitudinal wave velocity reduce, while Poisson's ratio has no obvious change; with the increase of the pore pressure, the rocks become a little shorter in the elasticity stage, while in the stage it prolongs; the binomial equation can well match the relationship between the pore pressure and the compressive strength.
引文
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[11]韩林, 刘向君, 孟英峰, 等.高压油气藏对砂岩力学特性影响的试验研究[J].岩石力学与工程学报, 2009,28(5):968-972.HAN Lin, LIU Xiangjun, MENG Yingfeng, et al. Experimental study of mechanical behaviors of sandstone under high-pressure oil and gas reservoir[J].Chinese Journal of Rock Mechanics and Engineering, 2009, 28(5):968-972.
[12]许江, 杨红伟, 彭守建, 等.孔隙水压力-围压作用下砂岩力学特性的试验研究[J].岩石力学与工程学报, 2010,29(8):1618-1623. XU Jiang, YANG Hongwei, PENG Shoujian, et al. Experimental study of mechanical property of sandstone under pore water pressure and confining pressure[J].Chinese Journal of Rock Mechanics and Engineering, 2010,29(8):1618-1623.
[13]刘向君, 申剑坤, 梁利喜, 等.孔隙压力变化对岩石强度特性的影响[J].岩石力学与工程学报, 2011,30(增刊2):3457-3463.LIU Xiangjun, SHEN Jiankun, LIANG Lixi, et al. Effects of pore pressure on rock strength properties[J].Chinese Journal of Rock Mechanics and Engineering, 2011,30(S2):3457-3463.
[14]杜文娟. 长期注水对井周储层物性影响试验[J].大庆石油地质与开发, 2016, 35(6):148-154.DU Wenjuan. Influences test of the long-term water injection on the reservoir physical properties around the well[J].Petroleum Geology & Oilfield Development in Daqing, 2016, 35(6):148-154.
[15]郑爱玲, 刘德华. 应力敏感对低渗致密气藏水平井压裂开采的影响[J].大庆石油地质与开发, 2016, 35(1):53-57.ZHENG Ailing, LIU Dehua. Influences of the stress sensitivity on the production of the fractured horizontal well in low-permeability tight gas reservoirs[J].Petroleum Geology & Oilfield Development in Daqing,2016,35(1):53-57.
[16]卓仁燕, 张烈辉, 郭晶晶, 等. 含气页岩渗透率实验[J].大庆石油地质与开发, 2016, 35(1):155-157.ZHUO Renyan, ZHANG Liehui, GUO Jingjing, et al. Experiment on gas-bearing shale permeability[J].Petroleum Geology & Oilfield Development in Daqing, 2016, 35(1):155-157.
[17]刘书会, 王长江, 罗红梅, 等. 泥页岩岩石物理参数测试与分析[J].油气地质与采收率, 2016, 23(6):16-21.LIU Shuhui, WANG Changjiang, LUO Hongmei, et al. Research on measurement and analysis of shale rock physical parameters[J].Petroleum Geology and Recovery Efficiency, 2016, 23(6):16-21.
[18]孙可明, 王婷婷, 翟诚,等. 天然气水合物加热分解储层变形破坏规律研究[J].特种油气藏, 2017, 24(5):91-96.SUN Keming, WANG Tingting, ZHAI Cheng, et al. Patterns of reservoir deformation due to thermal decomposition of natural gas hydrates[J].Special Oil & Gas Reservoirs, 2017, 24(5):91-96.
[19]HOU Bing,DIAO Ce, LI Dandan. An experimental investigation of geomechanical properties of deep tight gas reservoirs[J].Journal of Natural Gas Science & Engineering, 2017, 47(11):22-33.
[2]GEERTSMA J. Land subsidence above compacting oil and gas reservoirs[J].Journal of Petroleum Technology, 1973, 25(6):734-744.
[3]BRUNO M S, NAKAGAWA F M. Pore pressure influence on tensile fracture propagation in sedimentary rock[J].International Journal of Rock Mechanics & Mining Sciences,1991, 28(4):261-273.
[4]LAURENT J, BOUTECA M J, SARDA J P, et al. Pore-pressure influence in the poroelastic behavior of rocks:Experimental studies and results[J].SPE Formation Evaluation, 1993, 8(2):117-122.
[5]WARPINSKI N R, TEUFEL L W. Determination of the effective-stress law for permeability and deformation in low-permeability rocks[J].SPE Formation Evaluation, 1992, 7(2):123-131.
[6]KLIMENTOS T, HAROUAKA A, MTAWAA B, et al. Experimental determination of the biot elastic constant:Applications in formation evaluation (sonic porosity, rock strength, earth stresses,and sanding predictions)[J].SPE Reservoir Evaluation & Engineering, 1998, 1(1):57-63.
[7]FABRE D, GUSTKIEWICZ J. Poroelastic properties of limestones and sandstones under hydrostatic conditions[J].International Journal of Rock Mechanics & Mining Sciences, 1997, 34(1):127-134.
[8]路保平, 张传进, 鲍洪志.油气开发过程中岩石力学性质变化规律实验研究[J].岩石力学与工程学报, 2000,19(增刊1):878-881.LU Baoping, ZHANG Chuanjin, BAO Hongzhi. Testing study on changing law of rock mechanics properties during development of oil and gas[J].Chinese Journal of Rock Mechanics and Engineering, 2000,19(S1):878-881.
[9]王学滨, 潘一山. 考虑围压及孔隙压力的岩石试件应力与应变关系解析[J].地质力学学报, 2001, 7(3):265-270.WANG Xuebin, PAN Yishan. Theoretical analysis of relationship between stress and strain in consideration of confining pressure and pore pressure of rock sample[J].Journal of Geomechanics, 2001, 7(3):265-270.
[10]王学滨.孔隙压力对岩样全部变形特征的影响[J].沈阳建筑大学学报(自然科学版), 2005,21(6):625-629.WANG Xuebing. Effect of pore pressure on entire deformational characteristics of rock specimen[J].Journal of Shenyang Jianzhu University (Natural Science), 2005,21(6):625-629.
[11]韩林, 刘向君, 孟英峰, 等.高压油气藏对砂岩力学特性影响的试验研究[J].岩石力学与工程学报, 2009,28(5):968-972.HAN Lin, LIU Xiangjun, MENG Yingfeng, et al. Experimental study of mechanical behaviors of sandstone under high-pressure oil and gas reservoir[J].Chinese Journal of Rock Mechanics and Engineering, 2009, 28(5):968-972.
[12]许江, 杨红伟, 彭守建, 等.孔隙水压力-围压作用下砂岩力学特性的试验研究[J].岩石力学与工程学报, 2010,29(8):1618-1623. XU Jiang, YANG Hongwei, PENG Shoujian, et al. Experimental study of mechanical property of sandstone under pore water pressure and confining pressure[J].Chinese Journal of Rock Mechanics and Engineering, 2010,29(8):1618-1623.
[13]刘向君, 申剑坤, 梁利喜, 等.孔隙压力变化对岩石强度特性的影响[J].岩石力学与工程学报, 2011,30(增刊2):3457-3463.LIU Xiangjun, SHEN Jiankun, LIANG Lixi, et al. Effects of pore pressure on rock strength properties[J].Chinese Journal of Rock Mechanics and Engineering, 2011,30(S2):3457-3463.
[14]杜文娟. 长期注水对井周储层物性影响试验[J].大庆石油地质与开发, 2016, 35(6):148-154.DU Wenjuan. Influences test of the long-term water injection on the reservoir physical properties around the well[J].Petroleum Geology & Oilfield Development in Daqing, 2016, 35(6):148-154.
[15]郑爱玲, 刘德华. 应力敏感对低渗致密气藏水平井压裂开采的影响[J].大庆石油地质与开发, 2016, 35(1):53-57.ZHENG Ailing, LIU Dehua. Influences of the stress sensitivity on the production of the fractured horizontal well in low-permeability tight gas reservoirs[J].Petroleum Geology & Oilfield Development in Daqing,2016,35(1):53-57.
[16]卓仁燕, 张烈辉, 郭晶晶, 等. 含气页岩渗透率实验[J].大庆石油地质与开发, 2016, 35(1):155-157.ZHUO Renyan, ZHANG Liehui, GUO Jingjing, et al. Experiment on gas-bearing shale permeability[J].Petroleum Geology & Oilfield Development in Daqing, 2016, 35(1):155-157.
[17]刘书会, 王长江, 罗红梅, 等. 泥页岩岩石物理参数测试与分析[J].油气地质与采收率, 2016, 23(6):16-21.LIU Shuhui, WANG Changjiang, LUO Hongmei, et al. Research on measurement and analysis of shale rock physical parameters[J].Petroleum Geology and Recovery Efficiency, 2016, 23(6):16-21.
[18]孙可明, 王婷婷, 翟诚,等. 天然气水合物加热分解储层变形破坏规律研究[J].特种油气藏, 2017, 24(5):91-96.SUN Keming, WANG Tingting, ZHAI Cheng, et al. Patterns of reservoir deformation due to thermal decomposition of natural gas hydrates[J].Special Oil & Gas Reservoirs, 2017, 24(5):91-96.
[19]HOU Bing,DIAO Ce, LI Dandan. An experimental investigation of geomechanical properties of deep tight gas reservoirs[J].Journal of Natural Gas Science & Engineering, 2017, 47(11):22-33.
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