为了认识驱替压差对不同类型储层气相渗流能力的影响,明确不同类型储层的合理开采压力,以丹风场气田须家河组主力储层Ⅱ类和Ⅲ类致密砂岩为研究对象,借助核磁共振技术开展两类储层致密岩样在不同驱替压差下的气驱水实验,分析了驱替压差对两类储层气相流动能力的影响。结果表明：驱替压差对Ⅱ类和Ⅲ类储层岩样中气相流动特征的影响程度不同。Ⅱ类储层岩样中气相流动特征主要受驱替压差的影响,驱替压差越大,气相流动能力越强,且主要影响小孔喉中的流动能力;Ⅲ类储层岩样中气相流动特征不仅受驱替压差影响,而且还受储层的孔隙结构约束,当驱替压差与储层毛管压力相接近时气相流动能力最强。因此,对于丹凤场气田不同类型致密砂岩储层,在开采时应采用最佳生产压力使气相流动处于最佳状态。

In order to understand the influence of displacement pressure on the gas flow capacity for different types of reservoirs and clarify the reasonable production pressures of different types of reservoirs, the tight sandstones of the main reservoir type Ⅱ and Ⅲ in the Xujiahe Formation of Danfengchang Gas Field are taken as the research object. And with the help of the NMR technology, the gas-flooding experiments of the tight rock samples of the two types of reservoirs under different displacement pressures are carried out to analyze the effect of displacement pressure on the gas flow capacity. The results show that the the pore structure and the displacement pressure difference have different effects on the gas flow characteristics of the rock samples in type Ⅱ and type Ⅲ reservoir. The gas flow characteristics of the rock samples in type Ⅱ reservoir are mainly affected by the displacement pressure difference. The greater the displacement pressure difference, the stronger the gas flow ability. And it mainly affects the flow ability in the small pore throat. While the pore structure and displacement pressure difference of type Ⅲ reservoir rock samples affect the gas flow characteristics together. When the capillary pressures of the layers are close to each other, the gas flow capacity is the best. Therefore, for tight sandstones in different types of reservoirs in Danfengchang Gas Field, the best production pressure should be used to achieve the best gas flow capacity during production.