Recovery of Coalbed Methane by Gas Injection (2002)

Recovery of Coalbed Methane by Gas Injection Jichun Zhu; Jichun Zhu Department of Petroleum Engineering, Stanford University Search for other works by this author on: This Site Google Scholar Kristian Jessen; Kristian Jessen Department of Petroleum Engineering, Stanford University Search for other works by this author on: This Site Google Scholar Anthony R. Kovscek; Anthony R. Kovscek Department of Petroleum Engineering, Stanford University Search for other works by this author on: This Site Google Scholar Franklin M. Orr, Jr. Franklin M. Orr, Jr. Department of Petroleum Engineering, Stanford University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, April 2002. Paper Number: SPE-75255-MS https://doi.org/10.2118/75255-MS Published: April 13 2002 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Get Permissions Search Site Citation Zhu, Jichun, Jessen, Kristian, Kovscek, Anthony R., and Franklin M. Orr. "Recovery of Coalbed Methane by Gas Injection." Paper presented at the SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, April 2002. doi: https://doi.org/10.2118/75255-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Improved Oil Recovery Conference Search Advanced Search Abstract Injection of either carbon dioxide (CO2) or nitrogen (N2) can serve as an effective method for enhanced recovery of coalbed methane. In this paper, we provide new analytical solutions for flow of ternary gas mixtures. The adsorption/desorption of the components to/from the coalbed surface is approximated by an extended Langmuir isotherm, and the gas phase behavior is predicted by the Peng-Robinson EOS. Langmuir isotherm coefficients are used that represent a moist Fruitland coal sample from the San Juan Basin of Colorado. In these calculations, mobile liquid is not considered. Given constant initial and injection compositions, a self-similar solution that consists of continuous waves and shocks is found. Mixtures of CH4, CO2, and N2 are used to represent coalbed and injection gases. We provide examples for systems in which the initial gas has a high CH4 content, and binary mixtures of CO2 and N2 are injected. Injection of N2-CO2 mixtures rich in N2 leads to relatively fast initial recovery of CH4. Injection of mixtures rich in CO2 gives slower initial recovery, increases breakthrough time and decreases the injectant needed to sweep out the coalbed. The solutions presented indicate that a coalbed can be used to separate N2 and CO2 chromatographically at the same time CBM is recovered. Keywords: enhanced recovery, desorption, complex reservoir, ch 4, solution path, concentration, spe 75255, coal bed methane, eigenvalue, coalbed methane Subjects: Improved and Enhanced Recovery, Unconventional and Complex Reservoirs, Coal seam gas Copyright 2002, Society of Petroleum Engineers You can access this article if you purchase or spend a download.