合理井距选择的多方法研究与论证——以S区为例

Multi-method Research and Demonstration of Feasible Well Spacing Selection—— A Case Study of Block S

为了提高气藏采收率,实现低投入高回报的经济效益,本文以S区为例,根据该区砂岩岩性气藏特征,在长方形井网的基础上,研究该区合理的井距选择方法;分别采用经济评价法、合理采气速度法、渗透率与泄流半径法和数值模拟论证法4种方法进行论证,并对上述论证结果进行对比分析。研究结果表明:采用不规则布井方式,井网形式选择800 m排距,储渗性能差的部位采用500 m^600 m井距,储渗性能好的部位采用600 m^800 m井距为佳。该研究对气藏天然气富集区的高效开采提供了理论指导。

In order to improve the gas reservoir recovery efficiency, as to achieve the economic benefits of low investment and high profit, this paper takes block S as an example to investigate a feasible well spacing selection method according to its sandstone characteristics and on the basis of rectangle well pattern. Four methods, namely, methods based on economic evaluation, reasonable gas extraction velocity, permeability & discharge radius, and numerical simulation evaluation, are adopted respectively for comparison and analysis. Results from these methods show that, an 800 m well spacing should be chosen for irregular well pattern. Well spacings of 500 m ~ 600 m, and 600 m ~ 800 m are appropriate for positions of bad and good reservoir properties, respectively. This study provides theoretical guidance to the high efficiency production in the gas enrichment region.