SF气田水平井分段压裂关键参数优化设计

Key parameter optimization design of staged fracturing for horizontal well in SF Gas Field

钟森

Zhong Sen

中国石化西南油气分公司工程技术研究院，四川 德阳 618000

Research Institute of Engineering and Technology, Southwest Oil and Gas Company, SINOPEC, Deyang 618000, China

裂缝间距、加砂量等是水平井分段压裂设计的关键参数，直接影响着压后的增产与稳产效果。川西SF气田J3P气藏河道平面展布窄，砂体呈透镜体状，砂泥岩互层现象严重，储层非均质性强，采用常规设计方法实施压裂后，压后效果较差。为此，应用复位势及势叠加原理等基本渗流理论，结合气相拟压力函数和气体状态方程，建立了致密气藏压裂水平井在多条裂缝相互干扰下的产能计算模型，实现了水平井分段压裂的数值模拟优化。应用“一井一策”单井设计方法，根据单井钻遇显示、砂泥岩分布及砂体平面展布宽度等数据，对理论优化设计结果进行修正，提高了设计的针对性与有效性，对后续压裂施工设计具有一定的指导意义。

Fracture spacing and proppant volume are key parameters of staged fracturing for horizontal well, which directly affect the effect of production increasing or maintaining after fracturing. In J3P gas reservoir of SF Gas Field, the plane distribution of river course is narrow. The sand bodies are in lens shape. Sands are interbeded with shales and the reservoir heterogeneity is serious. The fracturing effect is poor when the conventional design method is adopted. Therefore, applying the basic filtration theories such as complex potential function and principle of potential superposition, and combining with the pseudo pressure function of gas phase and gas state equation, the production computational model is established for horizontal wells in tight gas reservoir, which considers the mutual interference among multi fractures. The establishment of model makes the numerical simulation come true for the optimization of staged fracturing for horizontal well. This paper applies with "one well, one policy" design method to further adjust the theory optimization result according to the data displaying of encountered formations, the data distributing of sands and shales and the width of sand plane distribution. This method improves the pertinence and effectiveness of design, which can guide for following fracturing design.

10.6056/dkyqt201304030