Exxon Chemical Patents, Inc.

Stim-lab, Inc.

Michael W Conway

Dennis A Williams

James R Looney

Robert A Swenson

Ronnie L Gregston

Melissa Y Walkingstick

Nick L Moore

Apparatus and method are provided for loading a cell for testing crush-resistance of a proppant or other granular material. The apparatus includes a rod valve and one or two screens selected to allow proppant to pluviate into the cell. Stress may be applied to the cell and the amount of proppant crushed by the stress may be measured. Measurements may be repeated to produce mean and variance values. Screen sizes may be varied to select sizes to minimize variance of measurements.

Apparatus and method for measuring crush-resistance of granular materials

A coalbed formation is stimulated to improve the recovery of methane which involves injecting into the coalbed formation an aqueous acid solution containing an organic amphoteric tertiary ammonium compound having from 1 to 3 tertiary ammonium groups, each N of which contains at least one C.sub.3 to C.sub.4 unsaturated carboxylic acid group, and wherein the compound contains a terminal benzyl or C.sub.5 -C.sub.19 alkyl group.

Stimulation of coalbed methane production

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Marlow, OK, United States of America

Michael W Conway