Improving the efficiency of methane extraction from coal seams

Authors

  • M. Rabatuly A. Saginov Karaganda Technical University
  • R.A. Musin A. Saginov Karaganda Technical University
  • V.F. Demin A. Saginov Karaganda Technical University
  • Sh.Е. Usupaev Central-Asian Institute for Applied Geosciences (CAIAG)
  • A.A. Kenetaeva Karaganda Technical University named after A. Saginov

DOI:

https://doi.org/10.31643/2023/6445.01

Keywords:

safety, coal mines, colmatation, wells, clay crust, hydrochloric acid.

Abstract

This article presents possible reasons for the low productivity of wells for coal methane extraction and ways to resolve them using hydrochloric acid treatment of wells. A common reason for the low productivity of wells is a decrease in the permeability of the bottom-hole formation zone. Starch, calcium carbonate, and drilling rocks, which are part of the drilling mud, change the filtration properties of the layer during the formation of a filtration crust and lead to a decrease in the initial permeability. Hydrochloric acid treatment, during which clay rocks are dissolved, is an effective method of increasing the productivity of wells. It is used to increase pick-up and prevent contamination of the bottom-hole zone of the carbonate formation. The parameters affecting the effectiveness of hydrochloric acid treatments were considered. The results of the experience of the interaction of hydrochloric acid with a clay crust are presented and analyzed using approaches to the mechanics of multiphase media. Dependences of the rate of dissolution of clay rock on the concentration of acid solution are obtained. It is established that the treatment of the productive intermediate layer of the well with hydrochloric acid in a certain concentration, its use increases the technological and economic efficiency of wells. As a result of experimental work, it was found that hydrochloric acid with an HCL concentration above 18% has a negative effect on the internal equipment of the well when processing clay shells.

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Author Biographies

M. Rabatuly, A. Saginov Karaganda Technical University

Ph.D., Senior lecturer of the Department of "Development of Mineral Deposits" of Karaganda Technical University, 100027, The Republic of Kazakhstan, Karaganda, Ave. Nursultan Nazarbayev, 56.

R.A. Musin, A. Saginov Karaganda Technical University

Ph.D.Senior lecturer of the Department of "Development of Mineral Deposits" of Karaganda Technical University, 100027, The Republic of Kazakhstan, Karaganda, Ave. Nursultan Nazarbayev, 56.

V.F. Demin, A. Saginov Karaganda Technical University

Doctor of Technical Sciences, Professor of the Department of "Development of Mineral Deposits" of Karaganda Technical University, 100027, The Republic of Kazakhstan, Karaganda, Ave. Nursultan Nazarbayev, 56.

Sh.Е. Usupaev, Central-Asian Institute for Applied Geosciences (CAIAG)

Doctor of Geological and Mineralogical Sciences, Professor of the Central-Asian Institute for Applied Geosciences (CAIAG), 720027 Kyrgyz Republic, Bishkek.

A.A. Kenetaeva, Karaganda Technical University named after A. Saginov

lecturer of Karaganda Technical University, Master of Engineering and Technology specialty "Geology",, 100027, The Republic of Kazakhstan, Karaganda, Ave. Nursultan Nazarbayev, 56.

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Published

2022-07-04

How to Cite

Rabatuly, M., Musin, R., Demin, V., Usupaev, S., & Kenetaeva, A. (2022). Improving the efficiency of methane extraction from coal seams. Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex Use of Mineral Resources, 324(1), 5–11. https://doi.org/10.31643/2023/6445.01

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