克拉2气田储层岩石的应力敏感性及其对生产动态的影响

克拉2气田是一个异常高压气藏，压力系数在2．0以上。在衰竭式开采条件下，其地层压力降幅可为普通气藏地层压力降幅的3倍以上，因此研究储层岩石应力敏感性及其对生产动态的影响意义重大。研究得出，岩石的应力敏感性特征主要有：岩石物性对应力的敏感性总体上不大，其中以孔隙度最小，渗透率次之，压缩系数最大；岩石物性随地层压力的下降而下降；在同一地层压降下．岩石物性下降幅度不是渗透率的连续函数，而是与渗透率分布范围有关，高渗透率范围，岩石物性下降幅度小，低渗透率范围，岩石物性下降幅度大。研究得出，克拉2气田岩石的应力敏感性对其生产动态的影响较小。

Stress sensitivity of the reservoir rock in Kela 2 Gas field and its effect on the production performance

Kela 2 Gas Field is an abnormal pressure gas reservoir with the pressure coefficient of more than 2.0.In the condition of depletion development,its formation pressure decrease,amplitude can be 3 times of the common gas reservoirs,so the study of stress sensitivity of the reservoir rock and its effect on production performance has a great significance.The study shows that rock stress sensitivity has the following characteristics:rock property has little sensitivity to stress,of which porosity has the least,permeability less,and compression coefficient most;the rock property decreases with formation pressure decrease;in the same formation pressure drop, decrease amplitude of the rock property is not a continuous function of permeability but related to distribution scope of permeability.The result shows that stress sensitivity of the rock in Kela 2 Gas Field has little effect on production performance.