深部砂岩力学实验及储层开采出砂影响规律

为研究深部储层砂岩在高温、高压、高应力状态下的开采出砂规律及主控因素，以克深区块为研究对象，开展了相应的岩石力学实验和数值模拟分析。实验岩心取自该区块致密砂岩储层，通过实验获得了高温高压下岩石的弹性模量、内聚力和内摩擦角等参数及其变化规律。结合实验结果和该地区地质特征，建立了深部砂岩储层直井开采热流固耦合模型，并利用有限元软件进行求解；通过分析储层Mises应力、等效塑性应变等参数变化特征，结合出砂判别标准，得到了不同开采条件下的出砂影响规律。采用正交试验设计方法进行了出砂敏感性因素分析，获得了其出砂的主控因素。研究结果表明：水平地应力的非均匀程度对储层开采出砂的影响最大，岩石胶结强度和生产压差的影响次之，地层温度变化影响相对较小。

The Rock Mechanics Experiments of Deep Sandstone and Influence Rules of Sand Production in Reservoir Exploitation

To research the sand production law and main controlling factors of deep reservoir sandstone under high temperature, high pressure, and high-stress state, the rock mechanics experiments and numerical simulations were carried out using the Keshen block as the object. The experimental cores were taken from the tight sandstone reservoirs in this block, and the elastic modulus, cohesion, and internal friction angle of rocks under high temperature and high pressure were obtained through experiments and their changing rules. By analyzing the variation characteristics of parameters such as 22Mises stress and equivalent plastic strain in the reservoir, combined with the criteria for sand production discrimination, the influence of sand production under different mining conditions was obtained. The factors of sand production sensitivity are analyzed by using the orthogonal design of experiments method, and the main control factors of sand production are obtained. The research results show that the inhomogeneous degree of horizontal stress has the most significant influence on the sand production of the reservoir, followed by the power of rock cement strength and production pressure difference, and the influence of formation temperature change is relatively smaller.