苏里格气田致密气藏经济极限井网密度确定方法

doi:10.7657/XJPG20250316

摘要/Abstract

摘要：

致密气藏井网优化均针对井网整体部署阶段，然而苏里格气田中区已开发至中—后期，产能建设已进入加密部署阶段，为了保障加密井的开发效果，需评价不同储集层条件、加密时机及天然气价格条件下经济极限井网密度。在苏里格气田中区分别选取不同储量丰度典型井区开展数值模拟研究，结合不同井网密度气井及气藏开发指标，评价不同井网密度气井干扰程度和老井不同生产年限地层压力分布规律，在此基础上预测加密井最终累计产气量；结合天然气价格等经济参数，确定不同加密时机经济极限井网密度，实现了加密井经济效益部署。在苏里格气田的应用显示，当天然气价格为1.119元/m³时，在未动用区可直接整体部署密度为4.5口/km²的经济极限井网；当需要进行井网加密时，在生产3年内的老井附近井网可加密到3.5口/km²；当天然气价格上涨到1.550元/m³时，在生产5年内的老井附近井网可加密到5.0口/km²。

关键词: 苏里格气田, 致密气藏, 经济极限井网密度, 累计产气量, 内部收益率, 加密时机, 采收率, 储量丰度

Abstract:

Well pattern optimization for tight gas reservoirs is generally implemented at the overall deployment stage. In the central Sulige gas field, which is now in mid-to-late development stage, the productivity construction enters the well infilling stage. To ensure the performance of infill wells, it is essential to evaluate the reasonable well pattern density under varying reservoir conditions, infill timing, and natural gas prices. In this study, typical well blocks with different reserves abundances in the central Sulige gas field were selected for numerical simulation. By analyzing development indicators of gas wells and gas reservoirs under different well pattern densities, the degree of gas well interference and formation pressure distribution of existing wells at different production stages were assessed. Based on these findings, the ultimate cumulative gas production of infill wells was predicted. By integrating economic parameters such as natural gas prices, the reasonable well pattern density for different infill timings was determined, enabling economically well infilling. The application in the Sulige gas field demonstrates that, at a natural gas price of 1.119 yuan/m3, a reasonable well pattern density of 4.5 well/km2 can be deployed in non-producing areas; for infill drilling near existing wells within 3 years of production, the well density can be increased to 3.5 well/km2; if the gas price rises to 1.550 yuan/m3, infill drilling near wells within 5 years of production can reach 5.0 well/km2.

Key words: Sulige gas field, tight gas reservoir, reasonable well pattern density, cumulative gas production, internal rate of return, infill timing, recovery factor, reserves abundance

中图分类号:

TE377

李鹏, 范倩倩, 徐文, 刘莉莉, 范继武, 白慧. 苏里格气田致密气藏经济极限井网密度确定方法[J]. 新疆石油地质, 2025, 46(3): 382-387.

LI Peng, FAN Qianqian, XU Wen, LIU Lili, FAN Jiwu, BAI Hui. Determination of Reasonable Well Pattern Density for Tight Gas Reservoirs in Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2025, 46(3): 382-387.

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