Title: Computer program for reduction and storage of field data from an in situ coal-gasification experiment. [Field]

Results of Hoe Creek Experiment No. 1, the first field test of the packed-bed concept for in-situ coal gasification, are reported. The packed-bed concept, originated at LLL, involves the use of an array of chemical explosives to enhance the permeability of a reaction zone within a thick bed of coal. Experiment No. 1 was a simple two-spot fracturing experiment in which two explosive charges were fired simultaneously at the bottom of a coal seam. Preshot and postshot characterizations of the site show that the coal permeability went from 0.3 D (darcy) to about 2 to 4 D. Examination of coresmore » taken after the blast showed moderate-to-heavy fracturing in the upper few feet of the coal bed, a lesser fractured zone in the middle, and a highly pulverized zone in the bottom 5 to 10 ft. Correspondence of the degree of fracturing with code calculations has built confidence in our ability to calculate the extent of fracturing. However, a review of flow behavior has led to the conslusion that permeability is not a simple function of the degree of fracturing. The coal was ignited and gasification proceeded for 11 days. During this time, 122 tons of coal were gasified out of an estimated 1000 tons within the fractured region. Heating quality of the gas averaged 110 to 150 Btu/scf.« less

Research reports on coal gasification are cited, listed in title sequence. They cover the techniques and processes of the conversion of coal to chemicals or fuels. Coal desulfurization, cleaning, or preparation, which do not involve conversion to gaseous fuels or chemical, are not covered. Also excluded are in-situ gasification studies. (This updated bibliography contains 214 citations, none of which are new entries to the previous edition.)

Research reports on coal gasification are cited, listed in title sequence. They cover the techniques and processes of the conversion of coal to chemicals or fuels. Coal desulfurization, cleaning, or preparation, which do not involve conversion to gaseous fuels or chemical, are not covered. Also excluded are in-situ gasification studies. (This updated bibliography contains 304 citations, all of which are new entries to the previous edition.)

A computer program, ISD97, was developed to analyze data from a series of in situ measurements on a grid and identify potential localized areas of elevated activity. The ISD97 code operates using a two-step process. A deconvolution of the data is carried out using the maximum entropy method, and a map of activity on the ground that fits the data within experimental error is generated. This maximum entropy map is then analyzed to determine the locations and magnitudes of potential areas of elevated activity that are consistent with the data. New deconvolutions are then carried out for each potential areamore » of elevated activity identified by the code. Properties of the algorithm are demonstrated using data from actual field measurements.« less