In-situ method of coal gasification

Details In-situ method of coal gasification In-situ method of coal gasification

2007-09-04

2007-09-04

Bates, Zakiya (Department: 3676)

Wells

Processes

Specific pattern of plural wells

Reexamination Certificate

active

11445356

ABSTRACT:
A method is provided for in-situ gasification of coal wherein a network of fractures is formed by providing a substantially vertically disposed borehole and a plurality of substantially horizontally disposed boreholes in fluid communication with the substantially vertically disposed borehole, at least one substantially horizontally disposed boreholes being a fracturing borehole, at least one substantially horizontally disposed boreholes being an injection borehole and at least one substantially horizontally disposed boreholes being an injection borehole. An initial quantity of liquified gas is introduced into the at least one substantially horizontally disposed fracturing borehole whereby the liquified gas vaporizes forms fractures in the formation. An additional quantity of liquified gas is injected into the substantially horizontally disposed fracturing borehole and vaporizes whereby a resulting increase in pressure in its at least one substantially horizontally disposed fracturing borehole forms additional fractures in the formation.

REFERENCES:
patent: 3612192 (1971-10-01), Maguire, Jr.
patent: 4087130 (1978-05-01), Garrett
patent: 4265310 (1981-05-01), Britton et al.
patent: 5558160 (1996-09-01), Tudor
Harry C. Carpenter & Harold W. Sohns, From Annual symposium on Oil Shale-1968, Application of Aboveground Retorting Variables To In Situ Oil Shale Processing, p. 815.
Memo to James Q. Maguire, Inc., from William W. Lewis dated May 28, 2002, regarding Air Separation Units.
C.H. Bowman, dated Mar. 1965, A Two-Spot Combustion Recovery Project, Society of Petroleum Engineers of Aime.
Colorado School Of Mines Research Institute, In-Situ Processing, Section 6 p. 51 date not available.
Isothermal Properties for Nitrogen, dated Jun. 17, 2003, Fluid Data.

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