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Methods of stimulating water sensitive coal bed methane seams

a technology of methane seams and water-sensitive coal beds, which is applied in the direction of fluid removal, insulation, and borehole/well accessories, can solve the problems of high cost and complex operation, and achieve the effect of enhancing the production of methane gas

Inactive Publication Date: 2005-09-29
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods for stimulating water-sensitive coal bed seams that are underground and contain methane gas. The methods involve heating the coal bed with hot nitrogen gas to create methane gas flow passages, and then producing methane gas from the coal bed through these passages. These methods overcome the deficiencies of previous methods and can enhance the production of methane gas from these seams.

Problems solved by technology

In order to provide the high rate of nitrogen gas, multiple high pressure pumper trucks are required making the operation very complex and expensive to carry out.

Method used

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Embodiment Construction

[0011] As mentioned, water sensitive coal bed seams containing under saturated low pressure methane gas have heretofore been difficult and expensive to fracture whereby the methane gas can be produced. The present invention provides methods of stimulating the thin water sensitive coal bed seams which are substantially less expensive than the prior art methods and allow the coal bed seam methane gas to be readily produced.

[0012] The methods of the present invention for stimulating a water sensitive coal bed seam containing under saturated low pressure methane gas penetrated by a well bore basically comprises the following steps. The coal bed seam is contacted and heated with hot nitrogen gas so that the coal bed in the seam shrinks and forms methane gas flow passages therein. Thereafter, the methane gas is produced through the flow passages.

[0013] The hot nitrogen gas is pumped into a coal bed seam at a low rate and pressure sufficient to heat and shrink the coal bed thereby formin...

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PUM

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Abstract

Methods of stimulating water sensitive coal bed seams containing methane gas are disclosed. The methods comprise the steps of contacting and heating the coal bed seam with hot nitrogen gas so that the coal bed in the seam shrinks and forms methane gas flow passages therein and producing the methane gas through the passages.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to methods of stimulating water sensitive coal bed methane seams that are under saturated with low pressure methane gas. [0003] 2. Description of the Prior Art [0004] The production of methane from subterranean coal beds by way of wells drilled into the coal beds has been practiced for many years. Generally, the coal beds contain absorbed hydrocarbon gases consisting primarily of methane. The coal beds usually contain water which when produced causes pressure to be reduced and the methane and other gases to be desorbed from the coal and produced along with the water. [0005] In some areas containing a plurality of thin coal bed seams, the methane gas in the seams has a low pressure and the seams are under saturated. A typical such field has from about 10 to about 40 thin coal bed seams in a 1,500 foot vertical well bore. These coal bed seams do not contain water and when the coal in the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B43/00E21B43/24E21B43/34
CPCE21B43/24E21B43/006
Inventor STROMQUIST, MARTY L.
Owner HALLIBURTON ENERGY SERVICES INC