致密储集层岩石应力敏感性测试与评价方法

发布时间：2018-01-11 20:31

  本文关键词：致密储集层岩石应力敏感性测试与评价方法　出处：《石油勘探与开发》2016年06期 　论文类型：期刊论文

  更多相关文章： 致密储集层 岩石上覆压力 孔隙压力 Terzaghi有效应力 应力敏感性 应力敏感系数

【摘要】：针对行业标准SY/T 5358—2010中储集层岩石应力敏感性测试方法、评价方法和判定标准存在的诸多问题,从5个方面提出了该标准需要修订的具体内容;根据班恩和马克西莫夫的岩石应力方程,推导出了Terzaghi有效应力公式,说明了Terzaghi公式不仅适合土壤力学而且也适合岩石力学。根据前人由渗透率模量公式导出的Terzaghi有效应力与岩石渗透率的指数关系式,拟合定外压变内压和定内压变外压两种不同的实验条件所测得的实验数据,都具有较高的拟合精度,由于定外压变内压测试与油藏开发实际相符,建议采用定外压变内压操作。研究认为:岩石应力敏感性强弱可用应力敏感系数(α)来评价,推荐标准:0.005 MPa~(-1)α≤0.025 MPa~(-1)为弱敏感;0.025 MPa~(-1)α≤0.035 MPa~(-1)为中等偏弱敏感;0.035 MPa~(-1)α≤0.045 MPa~(-1)为中等偏强敏感;0.045 MPa~(-1)α≤0.100 MPa~(-1)为强敏感;α0.100 MPa~(-1)为极强敏感。同时,根据多个文献的实验数据证实了砂岩储集层渗透率越低应力敏感性越强。
[Abstract]:According to the test method of reservoir rock stress sensitivity in SY/T 5358-2010, there are many problems in evaluation method and judgment standard. The concrete contents of the standard need to be revised from five aspects; According to the rock stress equations of Bann and Maximov, the Terzaghi effective stress formula is derived. The Terzaghi formula is not only suitable for soil mechanics, but also suitable for rock mechanics. The exponential relationship between Terzaghi effective stress and rock permeability derived from the permeability modulus formula is presented in this paper. . The experimental data obtained by fitting two different experimental conditions of constant external pressure variable internal pressure and constant internal pressure variation have higher fitting accuracy, because the measurement of constant external pressure variation internal pressure is in accordance with the actual reservoir development. It is suggested that the stress sensitivity of rock can be evaluated by stress sensitivity coefficient (伪). The recommended standard is: 0. 005 MPA (1) 伪 鈮，

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