Method for minimizing subsidence effects during production of co

Details Method for minimizing subsidence effects during production of co Method for minimizing subsidence effects during production of co

1981-06-15

1984-03-20

Suchfield, George A.

Wells

Processes

In situ combustion

166269, 166281, 166292, E21B 33138, E21B 43247

Patent

active

044375204

ABSTRACT:
Coal is reduced to ash in place by gasification using in situ production techniques, resulting in significant void space underground, which in turn causes roof fall and subsidence. Overburden collapse is stabilized by backfilling with foaming mud cement that hardens into an expanded solid, which quenches and fills the production module and seals residual ash. Rubble volumes and subsidence cracks are sealed against water incursions and contaminated water excursions. Surface facilities above barrier pillars are protected from destructive forces of subsidence draw.

REFERENCES:
patent: 1407873 (1922-02-01), Liedbeck
patent: 2213038 (1940-08-01), David
patent: 2236987 (1941-04-01), Bechtold
patent: 2390770 (1945-12-01), Barton et al.
patent: 2716511 (1956-09-01), Billue
patent: 3734184 (1973-05-01), Scott
patent: 4092052 (1978-05-01), Terry
patent: 4102397 (1978-07-01), Terry
patent: 4243101 (1981-01-01), Grupping

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