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

作　　者：Tianbi Ma Hongyang Chu Jiawei Li Jingxuan Zhang Yubao Gao Weiyao Zhu W.John Lee 

机构地区：[1]Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China [2]Department of Geosciences,The University of Tulsa,Tulsa,OK74104,USA [3]School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China [4]Harold Vance Department of Petroleum Engineering,Texas A&M University,College Station,TX 77843,USA [5]Houston Formation Evaluation Center,Schlumberger,Sugar Land,TX 77478,USA

出　　处：《International Journal of Coal Science & Technology》2024年第5期1-15,共15页国际煤炭科学技术学报(英文)

基　　金：This work received funding support from National Natural Science Foundation of China(12202042),Highend Foreign Expert Introduction Program(G2023105006L);China Postdoctoral Science Foundations(2021M700391);Fundamental Research Funds for the Central Universities(QNXM20220011,FRFTP-22-119A1,FRF-IDRY-22-001)。

摘　　要：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.

关 键 词：Natural gas hydrate Multilateral horizontal wells Production solution Superposition principle 

分 类 号：TE357[石油与天然气工程—油气田开发工程]