致密油藏水平井组井间地应力场时空演化特征

doi:10.11885/j.issn.1674-5086.2021.11.13.01

摘要/Abstract

摘要： 水平井组开发致密油藏时，孔隙压力大幅下降会显著改变井间地应力的大小与方向，迫使加密井压裂裂缝朝向老井压力衰竭区扩展，导致加密井产量受限。因此，掌握致密油藏井间地应力场时空演化特征是加密井布井与压裂时机优选的重要基础。针对新疆油田金龙2井区致密油藏，基于岩石多孔弹性理论，建立了双水平井组应力–渗流耦合模型，数值模拟得到随孔隙压力下降，井间地应力场的动态变化规律。以水平主应力方向发生反转时的孔隙压力变化值为评价指标，开展了储层物性和压裂完井参数对地应力时空演化特征的影响规律。结果表明，随孔隙压力下降，井间最大水平主应力方向发生反转；储层基质渗透率、井间距减小，单井单位储层厚度日产量及压裂缝间距增加会加快主应力反转，而初始储层孔隙压力对水平主应力变化趋势无影响，其中主要影响因素为井间距。

关键词: 致密油藏, 水力压裂, 渗流, 孔隙压力, 地应力场

Abstract: When horizontal well group develop tight oil reservoirs, the decrease of pore pressure will significantly change the distribution of interwell geostress. So the fractures in infill wells tend to propagate toward the depleted region, and the production of infill wells is limited. Therefore, the spatio-temporal evolution characteristics of interwell stress field in tight oil reservoirs is an important basis for well layout and fracturing optimization. Based on the porous elastic theory and the development parameters of typical tight oil reservoirs, a stress-seepage coupling model was built to find out the dynamic variation of the geostress field between horizontal wells with the decrease of pore pressure. Taking the change of pore pressure as the evaluation index when the horizontal principal stress direction inverse, carry out the effect of reservoir physical property and fracturing completion parameters on the spatial-temporal evolution of geostress. Results show that the direction of the maximum horizontal principal stress between wells changes with the decrease of pore pressure; the horizontal principal stress inversion is accelerated by the decrease of reservoir matrix permeability or well spacing or the increase of daily production per well or pressure fracture spacing. The initial pore pressure has no influence on the variation trend of horizontal principal stress, and the main factor is well spacing.

Key words: tight oil reservoir, hydraulic fracturing, fluid flow, pore pressure, geostress field

中图分类号:

TE348

张羽鹏, 吕振虎, 李嘉成, 陈小璐, 盛茂. 致密油藏水平井组井间地应力场时空演化特征[J]. 西南石油大学学报(自然科学版), 2024, 46(2): 77-86.

ZHANG Yupeng, Lü Zhenhu, LI Jiacheng, CHEN Xiaolu, SHENG Mao. Interwell Geostress Field Evolution of Horizontal Well Group in Tight Oil Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(2): 77-86.

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