页岩气藏“井工厂”模式下水平井裂缝分布优化

Abstract

Abstract:

Compared with the single well development mode of the conventional gas reservoirs, multi-well pad technology has several advantages such as great improvement of operating efficiency and reduction of project cost. Strong interference between the wells and between the fractures exist in small well spacing and network fracturing mode of multi-well pad for shale reservoir, which affect the overall development effect of the well group. Based on the unstructured PEBI grid technology, its simulator for fracturing horizontal wells is developed independently. According to the results of microseismic monitoring, the stimulated reservoir volume（SRV） area formed by the network fracturing of horizontal well groups are assumed to be ovals. Considering the adsorption, desorption, diffusion and nonlinear seepage mechanisms of shale gas, the numerical simulation model of the fracturing horizontal well group in the multi-well pad mode is established by the finite element method. The difference between the cumulative production of the single well and the well group is compared, and the influence of the layout mode of the fractures and the horizontal wells on the cumulative production in homogeneous shale gas reservoirs are discussed. The results show that the inter-well seepage interference makes the cumulative production of the well group lower than the sum of that of a single well. U-shape layout mode of the fractures for single well can reduce the interference to a certain extent, which make the cumulative production of the well group superior to that of the uniform mode and the inverted U-shape mode. The cumulative production of cross distribution of horizontal wells is better than that of parallel mode.

Key words: shale gas, multi-well pad, fractured horizontal well, production, optimization

CLC Number:

TE37

Yonggang DUAN,Tailai ZHANG,Mingqiang WEI, et al. Optimization of fracture layout of fractured horizontal well in multi-well pad mode of shale gas reservoirs[J]. Reservoir Evaluation and Development, 2019, 9(6): 78-84.

Figures/Tables 8

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References 20

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外区储层孔隙度（φ₂）	储层有效厚度（h）/m	各压裂水平井井底流压（P_wf）/MPa	天然气相对密度（r_g）	内区渗透率（k₁）/10^-3μm²	Langmuir压力（P_L）/MPa
0.05	16	12	0.57	0.05	10.4
裂缝半长(x_f)/m	Langmuir体积（V_L）/ （m³·m^-3）	综合扩散系数（D_k）/ （m²·s^-1）	压裂水平井间距（D_r）/m	各SRV区储层孔隙度（φ₁）	压裂水平井井数（N）/个
125	3	1×10^-9	500	0.08	3
原始地层压力（p_i）/MPa	储层温度/℃	外区渗透率（k₂）/10^-3μm²	裂缝间距（d_f）/m	裂缝数量（n_f）/条	水平井长度（L）/m
20	60	5×10^-4	100	10	1 000

Optimization of fracture layout of fractured horizontal well in multi-well pad mode of shale gas reservoirs

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