【摘要】 为了解决目前致密砂岩气藏井网密度优化方法可靠性较低、缺乏井网密度与采收率关系的有效论证等问题,通过建立井间干扰概率的计算方法,绘制出鄂尔多斯盆地苏里格气田目标研究区井间干扰概率曲线,进而建立了一套适用于致密砂岩气藏的井网密度优化与采收率评价新方法,并将该新方法应用于苏里格气田3个加密试验区的井网优化与采收率评价。研究结果表明:①致密砂岩气藏井间干扰概率与井网密度密切相关,随着井网密度的增加井间干扰概率呈现逐渐增加的趋势,直至井网密度达到一个相对大的值后,井间干扰概率才达到或接近于1;②苏里格气田3个加密试验区的经济最佳井网密度介于2.6～3.1口/km2,对应采收率介于36.6%～39.8%,井间干扰概率介于28%～33%,而经济极限井网密度介于5.2～6.6口/km2,对应采收率介于46.8%～49.8%,井间干扰概率介于83%～89%;③苏里格气田致密砂岩气藏经济最佳井网密度对应的井间干扰概率约为30%,经济极限井网密度对应的井间干扰概率约为85%。结论认为,采用新方法可以计算得到经济最佳、经济极限井网密度与对应的采收率,实现致密砂岩气藏的井网优化与采收率评价;该研究成果既可以为苏里格气田的经济高效开发提供理论支撑,也可以为同类型气藏的效益开发提供借鉴。更多还原

【Abstract】 For the sake of improving the reliability of the method for well pattern density optimization of tight sandstone gas reservoir and effectively demonstrate the relationship between well pattern density and recovery factor, the well interference probability curve of the target study area in the Sulige Gas Field was plotted by establishing the calculation method for well interference probability. Then,a new method suitable for well pattern density optimization and recovery factor evaluation of tight sandstone gas reservoirs was established. Finally, this new method was applied in three encryption test areas of the Sulige Gas Field. And the following research results were obtained. First, the well interference probability of tight sandstone gas reservoir is heavily dependent on the well pattern density.With the increase of the well pattern density, the well interference probability presents a gradual increasing trend. And the well interference probability doesn’t reach or approach to 1 until the well pattern density reaches a higher value. Second, in the three encryption test areas of the Sulige Gas Field, the economically optimal well pattern density is in the range of 2.6–3.1 wells/km2, and its corresponding recovery factor is 36.6%–39.8% and corresponding well interference probability is 28%–33%, while the economic limit well pattern density is in the range of 5.2–6.6 wells/km2, and its corresponding recovery factor is 46.8%–49.8% and corresponding well interference probability is 83%–89%. Third, the well interference probability corresponding to the economically optimal well pattern density of tight sandstone gas reservoir in the Sulige Gas Field is about 30%, and that corresponding to the economic limit well pattern density is about85%. In conclusion, by virtue of this new method, the economically optimal well pattern density and the economic limit well pattern density and their corresponding recovery factors can be calculated, so as to realize the well pattern optimization and recovery factor evaluation of tight sandstone gas reservoirs. The research results can provide theoretical support for the economic and efficient development of the Sulige Gas Field, and useful reference for the benefit development of the same type of gas reservoirs.更多还原