Coal seam fracing method

Details Coal seam fracing method Coal seam fracing method

1984-07-17

1986-01-28

Novosad, Stephen J.

Wells

Processes

Placing fluid into the formation

166380, 166280, E21B 43267, E21B 4327

Patent

active

045665397

ABSTRACT:
A method of hydraulically fracturing subterranean coal seams to improve the rate and total recovery of gas therefrom. The coal seam is fractured with acid and a proppant-laden fracing fluid in alternating injection stages. The initial injection stage of the fracturing fluid contains from about 0 to about 4 pounds of a spherical proppant having a particle size distribution substantially between 60 and 140 mesh. The subsequent fracing fluid injection stages are alternated with injection stages of a smaller volume of acid. The proppant loading in the fracing fluid is increased with each injection stage until the loading is from about 8 to about 12 pounds of proppant per gallon of fluid. The subsequent and terminal fracing fluid injection stages are with the higher proppant loading. Preferably, the volume of the fracing fluid injection stages is increased in successive stages from about 2000 to about 4000 gallons per stage initially to from about 6000 to about 8000 gallons per stage in the subsequent and terminal stages. The terminal fracing fluid injection stage is followed by a flushing of the well with a proppant-free fluid.

REFERENCES:
patent: 2774431 (1956-12-01), Sherborne
patent: 2802531 (1957-08-01), Cardwell et al.
patent: 3149674 (1964-09-01), Schutze et al.
patent: 3167123 (1965-01-01), Graham et al.
patent: 3235007 (1966-02-01), Kern et al.
patent: 3349851 (1967-10-01), Huitt et al.
patent: 3374835 (1968-03-01), Knox
patent: 3384416 (1968-05-01), Ruehl et al.
patent: 3412797 (1968-11-01), Huitt et al.
patent: 3433740 (1969-03-01), Armentrout
patent: 3437148 (1969-04-01), Colpoys, Jr.
patent: 3709300 (1973-01-01), Pye
patent: 3768564 (1973-10-01), Knox et al.
patent: 3818990 (1974-06-01), Coulter
patent: 3842911 (1974-10-01), Knox et al.
patent: 3918524 (1975-11-01), Broaddus et al.
patent: 3923666 (1975-12-01), Dill
patent: 3934651 (1976-01-01), Nierode et al.
patent: 3954142 (1976-05-01), Broaddus et al.
patent: 4186802 (1980-02-01), Perlman
patent: 4245699 (1981-01-01), Steeman
patent: 4245702 (1981-01-01), Haafkens et al.
patent: 4283089 (1981-08-01), Mazza et al.
patent: 4305464 (1981-12-01), Mazzi
patent: 4471840 (1984-09-01), Lasseter et al.
Lambert, S. W. et al., "Improved Methods for Monitoring Production from Vertical Degasification Wells," U.S. BOM, R.I. 8309 (1978).
Lambert, S. W. et al., "Methane Drainage: Experience with Hydraulic Stimulation Through Slotted Casing," U.S. BOM, R.I. 8295 (1978).
Trevits, M. A. et al., "Methane Drainage: Identification and Evaluation of the Parameters Controlling Induced Fracture Geometry," SPE/DOE 10820 (1982).
Lambert, S. W. et al., "Methane Drainage Ahead of Mining Using Form Stimulation," U.S. DOE, RI-PMTC-3 (1979).

Affiliated with

Also associated with

Rating

Coal seam fracing method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coal seam fracing method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coal seam fracing method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1301668