考虑启动压力梯度的乇渗气藏水平裂缝井产能分析  

Productivity Analysis of Wells with Horizontal Fractures in Low Permeability Gas Reservoirs under Consideration of Starting Pressure Gradient

作　　者：熊健[1] 胡永强 陈朕[3] 李东旭[4] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]新疆油田分公司采气一厂克拉美丽采气作业区 [3]新疆油田分公司风城作业区油田地质研究所 [4]新疆油田分公司采油一厂油田地质研究所

出　　处：《低渗透油气田》2013年第1期100-103,共4页

基　　金：西南石油大学研究生创新基金项目“非线性渗流下低渗气藏产能特征研究”（编号：GIFSS0701）.

摘　　要：针对低渗气藏经压裂后形成水平裂缝，基于稳定流理论，推导出，气井压裂后产生水平裂缝条件下，考虑启动压力梯度影响下的低渗气藏有限导流水平裂缝井产能预测模型，通过实例分析了各因素对产能的影响。研究结果表明：启动压力梯度对气井产能的影响呈下降趋势，且启动压力梯度增大越大，气井产能的下降幅度也越大，在气井产能评价中，不能忽视启动压力梯度的影响；在低渗气藏压裂参数设计中，增加水平裂缝的半长比增加裂缝导流能力更重要，同时一定水平裂缝的长度下，裂缝导流能力中存在一个最佳值，且增加水平裂缝的长度比增加裂缝导流能力更易实现。Horizontal fractures will appear after the low-permeability gas reservoir has been fractured. Based on steady flow theory and with the condition that horizontal fractures will be generated after fracturing of the gas well, a model for performance prediction of infinite-conductivity horizontal fractured wells, considering the well is under the influence of the starting pressure gradient, has been derived and established. Actual cases have been studied to analyze the influence of various factors on well production performance. The results show that the influence of the starting pressure gradient on gas well performance exhibits a declining trend, and the greater the starting pressure gradient increases, the greater the gas well performance drops, indicating that in the prediction of gas well production, the influence of the starting pressure gradient cannot be neglected. In the design of fracturing parameters for low- permeability gas reservoirs, it is more important to increase the half-length of horizontal fractures than to improve the conductivity of the fractures, in the meanwhile, when the horizontal fracture is of a specific length, there is an optimal value for the fracture conductivity, and to increase the length of horizontal fractures is easier to achieve compared with improving the conductivity of the fractures

关 键 词：低渗气藏 水平裂缝 启动压力梯度 产能分析 裂缝导流能力 

分 类 号：TE312[石油与天然气工程—油气田开发工程]