Although the fracturing techniques are used, the reservoir permeability increase is still very limited in some situations, and the support effect of the proppant tends to weaken over time [15]. Proppant plays an important role in the reservoir stimulation and permeability enhancement [16]. How to improve the reservoir permeability from the perspective of proppant is the key research direction. In the past decades, quartz sand and ceramicsite were mostly used as proppants [17]. The shapes of proppants were round, oval, cylindrical, and so on [18; 19]. The shape of the proppants had a certain impact on fracture permeability, but the impact was limited. The size of the proppant has an obvious influence on the crack permeability. According to the traditional permeability evaluation theory, for example, [PERSON]'s model \(k/R^{2}=0.2049^{4.58}\)[20], the larger the proppant particle size, the greater the fracture permeability under the premise of constant porosity. This conclusion can also be confirmed by the other permeability models [21; 22]. At present, the commonly used proppant type is mainly between 8 and 140 mesh, and the corresponding particle size range is 2.36-0.106 mm [17; 23; 24]. Usually, these small-sized proppants exist between the fractures in the form of continuous packet, as shown in the left part of Figure 1.  
[PERSON]'s research shows that the use of discontinuous proppant distribution can significantly improve the fracture permeability [25]. The discontinuous proppant mentioned by [PERSON] means that the proppant is stacked into discrete packets, and there are channels of a large size between the proppant packets, as shown in the right part of Figure 1. [PERSON] et al. verified [PERSON]'s view with the indoor experiments [26]. [PERSON] et al. found that the proppant in the form of discrete packages can significantly improve the fracture conductivity [26]. Similar conclusions were given by [PERSON] et al. (2013) [27]. [PERSON] et al. (2013) [27] found that the permeability of a fracture containing large-sized proppant was much higher than that of proppant packs. [PERSON] et al. [13] drew on [PERSON]'s research idea and proposed a layout scheme of large-sized proppant, as shown in Figure 2. [PERSON]'s research shows that the large-sized proppant can significantly improve fracture permeability. Essentially, the discrete proppant package mentioned by [PERSON] is equivalent to the large cylindrical proppant mentioned by [PERSON] et al. [13]. Figure 1: Comparison of the continuous and discontinuous proppant distribution. The left part is the proppant pack consisting of small-size proppant, which has a continue distribution characteristic. The right part is the proppant pillar, which can be regarded as the discrete large-size proppant [25]. Although [PERSON] and [PERSON] pointed out that the large-sized proppant can improve the fracture permeability, the improvement level has not been quantitatively evaluated yet. Furthermore, the research on the reservoir pressure field and production efficiency is still lacking after using the large-sized proppant. Compared with the traditional scheme of the continuous small-sized proppant package, the dynamic change characteristics of the reservoir pressure and gas production rate under the large-sized proppant scheme still lack understanding, which needs further research. This paper focuses on this topic.