延长气田碳酸盐岩气藏压裂工艺优化研究

Optimization of Fracturing Technology for Carbonate Gas Reservoir in Yanchang Gas Field

延长气田马家沟组碳酸盐岩气藏具有较大的勘探开发前景,酸化压裂将有效地提高单井产量,对气藏的有效开发具有重要作用。从马家沟组储层基本特征着手,开展了酸化压裂工艺的酸蚀裂缝导流能力评价及复杂压裂裂缝的可行性研究,从稠化剂浓度、液氮用量、闭合酸用量、顶替液量等方面优化了酸化压裂设计,形成一套适合马家沟组储层的酸化压裂工艺体系。

Majiagou formation carbonate gas reservoir in Yanchang gas field has a great prospect of exploration and development.Acid fracturing will effectively improve the well production and play an important role in the effective development of gas reservoirs.Based on the basic characteristics of the Majiagou formation reservoir,the evaluation of acid fracture conductivity and the feasibility study of complex fracture were carried out.The acid fracturing design was optimized from the concentration of thickener,the amount of liquid nitrogen,the amount of closed acid and displacement fluid.A set of acid fracturing process system suitable for the Majiagou formation reservoir was formed.