Rate transient analysis for multilateral horizontal well in natural gas hydrate: superposition principle and reciprocity

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Tianbi Ma, Hongyang Chu, Jiawei Li, Jingxuan Zhang, Yubao Gao, Weiyao Zhu, W. John Lee
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引用次数: 0

Abstract

Due to high energy density, clean combustion products and abundant resources, natural gas hydrates (NGHs) have been regarded as an important clean energy source with the potential for large-scale development and utilization. However, pilot tests in NGHs show that their production rates are far below commercial needs. Multilateral well technology may lead to a solution to this problem because it can dramatically expand the drainage area of production wells. This paper presents the practical rate transient analysis for multilateral horizontal wells in NGHs. In developing solution to the diffusivity equation of multilateral horizontal wells in NGHs, the superposition principle and reciprocity are applied. We wrote the governing equation in cylindrical coordinates to describe the NGH flow process. We used the moving boundaries and dissociation coefficients to model the solid-to-gas transition process in hydrates. To obtain solutions for flow in hydrate reservoirs, we used Laplace transforms and the Stehfest numerical inversion method. Superposition principle and Gaussian elimination are applied to obtain the desired solution for multilateral horizontal wells. We validated our proposed model with a commercial numerical simulator. By performing sensitivity analyses, effects on production behavior of the number of branches, dissociation coefficient, radius of the region with dissociated hydrate, and dispersion ratio are determined. A synthetic case study is conducted to show the typical production behaviors.

Abstract Image

天然气水合物中多边水平井的速率瞬态分析:叠加原理和互易性
天然气水合物(NGHs)具有能量密度高、燃烧产物清洁、资源丰富等特点,一直被视为一种重要的清洁能源,具有大规模开发和利用的潜力。然而,天然气水合物的试点测试表明,其生产率远远低于商业需求。多边井技术可以显著扩大生产井的排水面积,因此有可能解决这一问题。本文介绍了 NGHs 中多边水平井的实用速率瞬态分析。在求解 NGHs 中多边水平井的扩散方程时,应用了叠加原理和互易原理。我们在圆柱坐标中编写了控制方程,以描述 NGH 的流动过程。我们使用移动边界和解离系数来模拟水合物中固态到气态的转变过程。为了获得水合物储层中的流动解,我们使用了拉普拉斯变换和 Stehfest 数值反演方法。应用叠加原理和高斯消去法获得多边水平井的理想解。我们利用商业数值模拟器验证了我们提出的模型。通过进行敏感性分析,确定了分支数量、解离系数、解离水合物区域半径和分散比对生产行为的影响。还进行了一项合成案例研究,以展示典型的生产行为。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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