925results about How to "Increase gas production" patented technology

The present invention is directed to a method for producing gas from a subterranean formation containing a coal seam. The method includes the steps of drilling a substantially vertical well bore into the subterranean formation, which intersects the coal seam and fracturing the coal seam using a hydrajetting tool to produce at least one pair of opposed bi-wing fractures substantially along a plane of maximum stress. One or more horizontal well bores may also be drilled into the coal seam along which the coal seam can be further fractured.

The present invention relates generally to subterranean well construction, and more particularly, to improved methods for producing gas from subterranean formations that include coal seams. The method according to the present invention includes the steps of drilling at least one substantially vertical well bore intersecting the coal seam, drilling at least one substantially horizontal well bore disposed substantially within the coal seam and exiting from the at least one substantially vertical well bore, and fracturing the coal seam along the at least one substantially horizontal well bore using a hydrajetting tool to produce a plurality of fractures. The plurality of fractures is spaced to maximize interference between the fractures and enhances the production of gas from the coal seam of the subterranean formation. A plurality of substantially horizontal well bores can also be drilled. The plurality of substantially horizontal well bores can be spaced to maximize interference between the substantially horizontal well bores.

A coal-bed gas well electric pulse blockage releasing and permeation enhancing method is suitable for high-efficient mining of coal-bed gas wells. According to the blockage releasing and permeation enhancing method, a positive electrode coal-bed gas well shaft and a negative electrode coal-bed gas well shaft are constructed from the ground to a coal bed; cracks in the coal bed are closed gradually or blocked by granular impurities along with coal bed gas extraction after hydrofracturing, so that the gas yield is reduced; at the moment, a conductive ion solution is injected into the positive electrode coal-bed gas well shaft, and the portion, between the positive electrode coal-bed gas well shaft and the negative electrode coal-bed gas well shaft, of the coal bed is filled with the conductive ion solution; then a positive electrode and a negative electrode are put downwards to the coal bed permeation forecast increasing portions in the positive electrode coal-bed gas well shaft and the negative electrode coal-bed gas well shaft correspondingly; the portion, between the positive electrode and the negative electrode and filled with the conductive ion solution, of the coal bed is broken down through discharging of high voltage electropulses, great energy forms impact waves to act on the coal bed, the closed cracks in the coal bed are opened again and extend, the granules blocking the cracks are removed, the number of the cracks in the coal bed is effectively increased, and crack connectivity is improved.