Sandstone Stress Sensitivity Experiment and Stress Sensitivity Evaluation

Abstract:

Change confining pressure experiment or pore pressure experiment is one of the commonly used method to evaluate the reservoir core stress sensitivity. However, a large number of studies have shown that core net stress is not equal to the effective stress,the drawdown pore pressure experiment are consistent with the characteristics of oil and gas field real development process. The pressure stability of drawdown pore pressure experiment is bad, so, a reliable modified method of change confining pressure stress sensitivity experiment is eagerly expected. On the basis of the differential method principle, effective stress coefficient can be determined through core experiments,and with the use of effective stress coefficient , change confining pressure experiment is modified. Main conclusions are as follows:For sandstone core,at reservoir original stress condition with the pore pressure from 15MPa to 11MPa effective stress coefficient from 0.436 to 0.415;Based on Terzaghi effective stress exaggerate stress sensitivity, ontology effective stress can weaken the stress sensitive; Based on effective stress coefficient in this paper correction stress sensitivity is medium weak,impacts on production results almost coincident with the drawdown pore pressure test results.

• Periodical: Advanced Materials Research (Volumes 962-965)
• Pages: 526-530
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.962-965.526
• Online since: June 2014
• Authors: Tao Gao, Xiao Guo, Hong Mei Yang, Hai Tao Li, Zheng Zhu
• Keywords: Capacity Influence, Effective Stress Coefficient, Sandstone Core, Stress Sensitivity Experiment

References

[1] Lorenz J C. Stress-sensitive reservoirs[J]. Journal of Petroleum Technology, 1999, 51(01): 61-63.

[2] Sayers C M. Sensitivity of time‐lapse seismic to reservoir stress-path [J]. Geophysical Prospecting, 2006, 54(3): 369-380.

DOI: 10.1111/j.1365-2478.2006.00539.x

[3] Ruistuen H, Teufel L W, Rhett D. Influence of reservoir stress path on deformation and permeability of weakly cemented sandstone reservoirs [J]. SPE Reservoir Evaluation & Engineering, 1999, 2(03): 266-272.

DOI: 10.2118/56989-pa

[4] Gland N, Dautriat J, Dimanov A, et al. Stress path dependent hydro mechanical behaviour of heterogeneous carbonate rock[C]/EPJ Web of Conferences. EDP Sciences, 2010, 6: 22006.

DOI: 10.1051/epjconf/20100622006

[5] Xiangfang Li , wang Yang, et al. Considering the effect of pressure arch computate the overlying pressure of Sulige gas field [J]. Gas field in daqing petroleum geology and development, 2013, 32(5): 61-66.

[6] Heai Ren, ShixuLi Zhao, Fu Cheng , etc. Confining pressure stress sensitivity experiment evaluation of low permeability sandstone [J]. Marine geology frontier, 2012, 28(6): 60-64.

[7] Terzaghi K., Theoretical Soil Mechanics. Wiley, New York, (1943).

[8] Kranzz R L, Frankel A D, Engelder T, et al. The permeability of whole and jointed Barre granite[C]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Pergamon, 1979, 16(4): 225-234.

DOI: 10.1016/0148-9062(79)91197-5

[9] Walsh J B. Effect of pore pressure and confining pressure on fracture permeability[C]/International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Pergamon, 1981, 18(5): 429-435.

DOI: 10.1016/0148-9062(81)90006-1

[10] Li M, Bernabé Y, Xiao W I, et al. Effective pressure law for permeability of E‐bei sandstones[J]. Journal of Geophysical Research: Solid Earth (1978–2012), 2009, 114(B7).

DOI: 10.1029/2009jb006373

[11] Wenlian Xiao, Jinzhou Zhao , Min Li , etc. Sandstone of the rich clay minerals deformation response characteristics research in low permeability [J]. Rock and Soil Mechanics, 2012, 33(8).

[12] BERNABE Y. The effective pressure law for permeability during pore pressure and confining pressure cycling of several crystalline rocks [J]. Journal of Geophysical Research, 1987, 92(B1): 649－657.

DOI: 10.1029/jb092ib01p00649

[13] 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.

DOI: 10.2118/20572-pa