Patent ID: 6024171
Filing Date: 2000-02-15
Classification: E21B,E21F

Abstract:
A method for stimulating a wellbore penetrating a methane-containing carbonaceous subterranean formation having a natural system of fractures to increase the production of methane from the formation, the method comprising:a) positioning a hydrajet in an uncased portion of the wellbore penetrating the formation;b) perforating the formation with the hydrajet;c) removing the hydrajet from the wellbore;d) thereafter producing carbonaceous fluids and particulates from the formation through the wellbore by the steps of shutting the wellbore for a shut-in period to permit the pressure in the wellbore to increase and, thereafter, opening the wellbore for a production period to permit a flow of fluids and particulates from the formation into, upwardly, through and out of the wellbore and repeating the steps of shutting and opening the wellbore to form a cavity in the formation around the wellbore;e) producing methane from the formation via the wellbore and the cavity at an increased rate.