碳酸盐岩气层水力压裂支撑缝几何尺寸计算新方法

方法对于具有均质性的气藏，依据气藏气井已测得的并温解释成果，对引进的经验公式进行修改，建立本气藏压裂后的支撑缝缝高计算公式；依据压力分布原理，利用措施前后的测试成果，反算支撑缝缝长；结合实际施工规模和实验参数，确定支撑缝缝宽。目的研究出一种直接求取水力压裂支撑缝长、宽及高的综合方法。结果该方法避免了多解性的出现，且不考虑裂缝模型，不必假设缝高，因此可信度高。结论该方法计算简便，易于掌握，开辟了支撑缝几何尺寸计算的新途径，对于加砂压裂增产效果明显的气井，具有推广应用价值。

New calculation method for the propped fracture geometry size of hydraulic fracturing in carbonate gas reservoir

Method For homogeneous gas reservoir, modification of imported empirical equationavailable is done according to the wellbore temperature interpretation result of gas reservoirto establish the calculating equation of the height of the supporting fracture after hydraulicfracturing. The length of the fracture is calculated according to pressure distribution principle and by way of testing result before and after fracturing. The width of the propped fracture is determined based upon actual operation size and experimental parameter. PurposeTo study an integrated method to calculate length, width is and height of the propped fracture directly. Result This method avoids the situation of multi result. It has high credibility with no consideration of the size of the fracture and no necessity to suppose the height ofthe fracture. Conclusion This method is easy in calculation, convenient to master and itopens up a new method in the calculation of the geometry size of the propped fracture. It hasthe value of widely application in those gas wells which have significant production increasingeffect by fracturing.