Profile control and water plugging technology for coal bed gas

Abstract

The invention relates to a coal bed air-regulating agent water shutoff technology it is based on geological features and fracturing transformation parameters of the coal bed methane, determine the water layer, constitute the overall water shutoff profile control programmes; the technology programmes of the water blocking and the amount is designed in accordance with the principle that water shutoff gel system subparagraph design , intensity gradually increased, moderate gel viscosity and various sect crosslinking time reasonable; construction in accordance with the above design programmes. The invention rational design, process is simple and easy construction, can be achieved selective water shutoff using the technology, stopping the channel between the coalbed methane wells and storage and not plug the coal reservoir cleats, fissures and cracks fracturing and thereby effectively drainage relief to ensure normal production of the coalbed methane wells.

Description

Technical field: [0001] The invention relates to a technology for solving the water discharge problem in the process of mining coal bed gas. Background technique: [0002] Coalbed methane exploitation is one of the ways to alleviate the energy shortage. At present, when coalbed methane is exploited on site, drainage and pressure reduction after reservoir reconstruction are usually the main method. However, in areas with relatively complex geological structures, if there is a large amount of water stored in the wellbore and the water storage area after reservoir reconstruction, there will be a lack of methods that can block the water outlet channels without blocking the coal reservoir cleats, cracks and reformed fractures. craft technology. This technical problem restricts the mining process of coalbed methane, and it is extremely necessary to develop and continuously improve the technology used to solve the above problems in actual production. Invention content: [0003...

AI Technical Summary

Problems solved by technology

However, in areas with relatively complex geological structures, if there is a large amount of water stored in the wellbore and the water storage area after reservoir reconstruction, there is a lack of methods that can block the water outlet channels without blocking the coal reservoir cleats, cracks and reformed fractures. Technology

This technical problem restricts the mining process of coalbed methane, and it is extremely necessary to develop and continuously improve the technology used to solve the above problems in actual production.