| 崔明月.高含硫气藏非稳态水平井产量预测模型研究[J].地质与勘探,2021,57(5):1173-1181 |
| 高含硫气藏非稳态水平井产量预测模型研究 |
| Unsteady state production prediction model of horizontal wells in high-sulfur gas reservoirs |
| 投稿时间：2020-09-06 修订日期：2020-12-22 |
| DOI：10.12134/j.dzykt.2021.05.022 |
| 中文关键词: 水平井 硫沉积 缝间干扰 非稳态 产量预测 |
| 英文关键词: horizontal well, sulfur deposition, crack interference, unsteady state, production prediction |
| 基金项目:“十三五”国家油气重大专项“中亚和中东地区复杂碳酸盐岩油气藏采油采气关键技术研究与应用”（编号: 2017ZX05030）资助 |
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| 中文摘要: |
| 元素硫从含硫天然气中析出沉降会影响流体流动,常规的水平井产量预测模型无法用于高含硫气藏水平井非稳态产量预测。本文基于非稳态椭圆流理论，耦合基质内的椭圆流动和裂缝内的非达西流动，考虑元素硫沉积及缝间干扰效应的影响，建立了适用于酸化水平井与酸压水平井的非稳态产量预测模型。分析了硫沉积对渗透率、孔隙度的影响，计算了不同裂缝参数对产能的影响，该模型适用于变井底流压生产条件。计算结果表明：科学准确的元素硫溶解度模型能较好地预测高含硫气藏水平井产量。酸压改造后缝间干扰现象会降低气井产能，且随着时间逐渐增强。硫沉积会降低储层渗透率和孔隙度，使得产量下降。增大裂缝导流能力，增加裂缝半长或者裂缝数量都能有效提高水平井产量，与裂缝导流能力相比，裂缝半长和裂缝数量对产量的影响更大。 |
| 英文摘要: |
| Fluid flow can be affected by elemental sulfur precipitation from sour natural gas. The conventional production prediction model of horizontal wells cannot be used for high sulfur gas reservoirs. This work attempts to solve this problem. Based on the unsteady-state elliptic flow theory and coupling the elliptical flow in matrix and non-Darcy flow in cracks, an unsteady production prediction model which is suitable for acidizing horizontal wells and acid fracturing horizontal wells is constructed considering the effects of elemental sulfur deposition and interference between cracks. The influence of sulfur deposition on permeability, porosity and production is analyzed, and the effect of crack parameters on production is calculated. This model is suitable for variable bottom hole flow pressure. The calculation results show that well production prediction in high sulfur gas reservoirs will be more exact using a scientific sulfur solubility model. Well production may decline when inter-crack interference is taken into consideration, and the influence is gradually increased over time. Sulfur deposition can reduce the reservoir porosity and permeability, resulting in a decrease of production. Increasing the crack conductivity, crack half-length or the number of cracks can effectively enhance the production of horizontal wells. Compared with crack flow conductivity, the crack half-length and the number of cracks can pose a greater influence on well production. |
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