Tight sandstone gas reservoirs differ greatly in physical properties, and this kind of uncertainties severely set a limit to the steady production and efficient development of gas reservoirs. In order to effectively develop untapped reserves of tight sandstone gas reservoirs and improve their production and recovery, it is important to optimize the well pattern density for the ones with complex reservoir conditions. In this paper, a new index parameter is proposed for the optimization of well pattern density and recovery of tight sandstone gas reservoirs with complex reservoir conditions: the dynamic single-well control area (DSWCA). And the fuzzy synthetic evaluation method is used to establish the relationship between DSWCA and 7 reservoir physical parameters when there is no inter-well interference. The seven parameters are permeability, porosity, effective thickness, water saturation, threshold pressure gradient, productivity coefficient and storage coefficient. Besides, the calculated fuzzy prediction value of the DSWCA is compared with the geological well control area to determine whether there will be inter-well interference due to well pattern infilling under different physical reservoir conditions, and the variation curve of the interference probability with well pattern density is obtained. Finally, a gas recovery evaluation model is constructed combined with inter-well interference probability. The new evaluation method and model derivation comprehensively evaluate the influence of multiple reservoir physical parameters on the DSWCA and the quantitative relationship among them, thus capable of effectively calculating the DSWCA and predicting the production and recovery of the gas field beforehand from a very early stage using the related parameters. The new method, combined with a large number of physical parameter data of fractured vertical wells, was applied in the Su-6 block of the Sulige gas field and compared with the results of actual gas well production dynamics, revealing the consistency of the two results. This method is verified to be reasonable and reliable under certain conditions, and the new method for gas recovery evaluation provides new ideas for the well pattern optimization in tight sandstone gas reservoirs.

致密砂岩气藏的物性差异很大，这种不确定性严重限制了气藏的稳定生产和有效开发。为了有效开发未开发的致密砂岩气藏，提高产量和采收率，对于复杂储层条件，优化井网密度至关重要。本文提出了一种新的指标参数：动态单井控制区（DSWCA），用于优化复杂储层条件下致密砂岩气藏的井网密度和采收率。在井间无干扰的情况下，采用模糊综合评价方法建立DSWCA与7个油藏物理参数之间的关系。七个参数是磁导率 孔隙率，有效厚度，水饱和度，阈值压力梯度，生产率系数和储能系数。此外，将计算得到的DSWCA的模糊预测值与地质井控区进行比较，确定在不同物理储层条件下是否存在因井网填充引起的井间干扰，以及井网干扰概率的变化曲线。获得密度。最后，结合井间干扰概率，建立了天然气采收率评价模型。新的评估方法和模型推导综合评估了多个储层物理参数对DSWCA的影响及其之间的定量关系，因此，能够使用相关参数从很早的阶段就有效地计算出DSWCA并预先预测气田的生产和采收率。将该新方法与大量裂缝性垂直井的物理参数数据相结合，应用于苏里格气田的Su-6区块，并与实际气井生产动态的结果进行了比较，揭示了两个结果的一致性。 。该方法在一定条件下被证明是合理可靠的，新的气藏评价方法为致密砂岩气藏的井网优化提供了新思路。该方法在苏里格气田的Su-6区块中得到了应用，并与实际气井生产动态的结果进行了比较，揭示了这两个结果的一致性。该方法在一定条件下被证明是合理可靠的，新的气藏评价方法为致密砂岩气藏的井网优化提供了新思路。该方法在苏里格气田的Su-6区块中得到了应用，并与实际气井生产动态的结果进行了比较，揭示了这两个结果的一致性。该方法在一定条件下被证明是合理可靠的，新的气藏评价方法为致密砂岩气藏的井网优化提供了新思路。