Multiple-stage coal seam fracturing method

Details Multiple-stage coal seam fracturing method Multiple-stage coal seam fracturing method

E - Fixed Constructions

21

B

166/24

E21B 43/267 (2006.01) C09K 8/72 (2006.01) E21B 43/00 (2006.01) E21B 43/26 (2006.01)

Patent

CA 1222942

ABSTRACT OF THE DISCLOSURE An improved method of multiple-stage hydraulic fracturing of coal seams to improve the rate and total recovery of gas therefrom. In one aspect, the improvement comprises completing the well with 7-inch or larger casing and 3-1/2 inch or larger tubing. In another aspect, the stagewise fracturing is continued until the following quantity of 60-140 mesh proppants has been deposited in the formation: for 5 ? h < 10, m ? 500,000; for 10 ? h < 15, m ? 750,000; for 15 ? h < 20, m ? 1,000,000; for 20 ? h < 25, m ? 2,000,000; and for h > 25, m ? 3,000,000; wherein h is the vertical thickness of the coal seam in feet and m is the minimum quantity of the fine proppants in pounds deposited therein. In another aspect, a coal seam fractured by the multiple-stage method is refractured after producing or shutting in the well for a period of time to permit closure of the fractures on the proppant placed therein in the earlier multiple-stage fracturing of the coal seam.

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