复杂断块气藏采收率的确定方法研究

METHODS OF DETERMINING COMPLEX FAULT BLOCK GAS RESERVOIR RECOVERY

复杂断块气藏具有构造复杂、储层物性差、埋藏深、异常高压等特点 ,因而确定气藏采收率的难度很大。目前气藏采收率测算方法比较多 ,国内外广泛采用的方法主要有物质平衡法、产量递减法、数值模拟法、经验取值法、类比法等 8种方法 ,文章针对复杂断块气藏埋藏深而对采气工艺要求高、构造复杂增加布井方式难度、单井生产层数多而使压裂改造难度增大等问题 ,进行了综合研究 ,从而确定了适合该类气藏特点的一种或几种提高气藏采收率的方法 ,使其更反映气藏实际生产情况 。

Complex fault block gas reservoirs are of these characteristics, such as complicated structural conditions, poor petrophysical properties, deep burials and abnormal high pressures, etc., so it is very difficult to determine their recoveries. There are many methods of predicting and calculating gas reservoir recovery and the following methods are widely adopted at home and abroad, i.e. material balance method, production decline method, numerical simulation method, empirical judgement method and analogy method, etc. Through comprehensively analyzing these problems, such as high demand for gas-production techniques because of deep burial of gas reservoir and in crease in difficulties in well spacing pattern owing to complicated structural condition and in fracturing transformation because of multiple-zone production in single well, one or several methods of raising gas reservoir recovery, which are suitable for the characteristics and practical production circumstances of this kind of gas reservoirs, are proposed in the paper, which is possessed of guiding significance for studying the recovery of the same kind of gas reservoirs.