Shao Mingren, Yang Qi, Zhou Bo, Dai Shuhui, Li Ting, Ahmad Faraj
China United Coalbed Methane Corporation, Ltd., Beijing 100011, China.
Downhole Technology Operation Company, CNPC Chuanqing Drilling Engineering Company Limited, Xi'an 710021, Shanxi, China.
ACS Omega. 2021 Feb 8;6(7):5009-5018. doi: 10.1021/acsomega.0c06143. eCollection 2021 Feb 23.
A semianalytical coupled reservoir/wellbore model based on the volumetric source for horizontal wells of sulfur gas reservoirs is presented, which considers sulfur deposition and permeability heterogeneity. Compared to the results without considering the sulfur deposition effect, the results of this paper model is better fitted to field production data and average relative errors of two simulated results are 8.37% (considering sulfur deposition) and 23.38% (not considering sulfur deposition). Based on the model, we perform sensitivity in terms of various sulfur depositions, producing pressure drop, and permeability contrast. Results show that the production decreases with increased sulfur deposition, and the flow rate along the wellbore in the horizontal well decreases because of sulfur deposition. The production without and with sulfur deposition increases with increased producing pressure drop, while the production without sulfur deposition is higher. Also, higher producing pressure drop causes a higher nonuniform inflow profile along the horizontal well. Sulfur deposition can reduce a nonuniform biased inflow profile along the horizontal well in heterogeneous sulfur gas reservoirs, but the horizontal well production is reduced. Therefore, sulfur deposition is crucial for the production prediction and inflow profile along the horizontal well in heterogeneous sulfur gas reservoirs.
提出了一种基于含硫气藏水平井体积源的半解析油藏/井筒耦合模型，该模型考虑了硫沉积和渗透率非均质性。与不考虑硫沉积效应的结果相比，本文模型的结果与现场生产数据拟合得更好，两种模拟结果的平均相对误差分别为8.37%（考虑硫沉积）和23.38%（不考虑硫沉积）。基于该模型，我们对各种硫沉积、生产压降和渗透率对比度进行了敏感性分析。结果表明，产量随着硫沉积的增加而降低，水平井井筒内的流量由于硫沉积而减少。有硫沉积和无硫沉积时的产量均随着生产压降的增加而增加，但无硫沉积时的产量更高。此外，更高的生产压降会导致水平井沿程流入剖面的不均匀性更高。硫沉积可以减少非均质含硫气藏水平井沿程不均匀的偏向流入剖面，但水平井产量会降低。因此，硫沉积对于非均质含硫气藏水平井的产量预测和流入剖面至关重要。
