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Nonlinear Flow Characteristics and Horizontal Well Pressure Transient Analysis for Low-Permeability Offshore Reservoirs

机译：低渗透海洋油藏非线性流动特征及水平井压力瞬态分析

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摘要

Threshold pressure gradient (TPG) and stress sensitivity which cause the nonlinear flow in low permeability reservoirs were carried out by experiments. Firstly, the investigation of existing conditions of TPG for oil flow in irreducible water saturation low-permeability reservoirs was conducted and discussed, using the cores from a real offshore oilfield in China. The existence of TPG was proven. The relationship between TPG and absolute permeability was obtained by laboratory tests. TPG increases with decreasing absolute permeability. Then, stress sensitivity experiment was carried out through depressurizing experiment and step-up pressure experiment. Permeability modulus which characterizes stress sensitivity increases with decreasing absolute permeability. Consequently, a horizontal well pressure transient analysis mathematical model considering threshold pressure gradient and stress sensitivity was established on the basis of mass and momentum conservation equations. The finite element method (FEM) was presented to solve the model. Influencing factors, such as TPG, permeability modulus, skin factor, wellbore storage, horizontal length, horizontal position, and boundary effect on pressure and pressure derivative curves, were also discussed. Results analysis demonstrates that the pressure transient curves are different from Darcy's model when considering the nonlinear flow characteristics. Both TPG and permeability modulus lead to more energy consumption and the reservoir pressure decreases more than Darcy's model.
机译：通过实验研究了引起低渗透油藏非线性流动的临界压力梯度（TPG）和应力敏感性。首先，以中国某近海油田的岩心为研究对象，探讨了不可饱和水饱和度低渗透油藏中TPG的流动条件。 TPG的存在被证明。 TPG与绝对渗透率之间的关系是通过实验室测试获得的。 TPG随着绝对渗透率的降低而增加。然后，通过降压实验和升压实验进行了应力敏感性实验。表征应力敏感性的渗透模量随绝对渗透率的降低而增加。因此，在质量和动量守恒方程的基础上，建立了考虑阈值压力梯度和应力敏感性的水平井压力瞬态分析数学模型。提出了有限元方法（FEM）来求解模型。还讨论了影响因素，例如TPG，渗透率模量，表皮因素，井筒存储，水平长度，水平位置以及边界对压力和压力导数曲线的影响。结果分析表明，考虑非线性流动特性时，压力瞬变曲线与Darcy模型不同。 TPG和渗透率模量都导致更多的能源消耗，并且储层压力的下降比Darcy模型要多。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第4期|387149.1-387149.13|共13页
  • 作者

    Xu Jianchun; Jiang Ruizhong; Teng Wenchao;

  • 作者单位

    China Univ Petr East China, Qingdao 266580, Peoples R China.;

    China Univ Petr East China, Qingdao 266580, Peoples R China.;

    China Univ Petr East China, Qingdao 266580, Peoples R China.;

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