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Title: Successful field applications of CO/sub 2/ foam fracturing fluids in the Ark-La-Tex region

Conference · · Soc. Pet. Eng. AIME, Pap.; (United States)
OSTI ID:5361145

The CO/sub 2/ foam fracturing fluid provides a gas drive to assist removal of the treating (load) fluids after the proppant has been placed in the formation, establishes permeability to gas within the formation volume that has been saturated by load fluids, and minimizes the actual water volume that is required to place a given volume of proppant in the formation. Due to the high density of the liquid CO mixture, the CO foam can be utilized on deep, high pressure formations without experiencing prohibitive wellhead treating pressures. The CO also reacts with the water in the foam to form carbonic acid, so that the overall pH of the system is reduced (thus reducing the damaging effect of the fluids), and it lowers the surface tension of the load fluids so that they can be recovered more rapidly and efficiently. Field experience in the Ark-La-Tex area has demonstrated that the CO foam system can be used successfully in low permeability oil and/or gas sands and carbonates, at depths ranging from 2900' to 14,000, reservoir temperatures of 120F to 370F, and reservoir pressures of 1000 psi to 13,200 psig. Treatment histories and pressure transient tests have demonstrated that many of these formations are sensitive to some fluids utilized in conventional gelled water fracture treatments. A comparison of CO foam with several other stimulation methods demonstrates its overall success. In many instances the production results obtained with CO foam fluid are superior to more conventional systems that have been used in the past.

Research Organization:
Crystal Oil Co.
OSTI ID:
5361145
Report Number(s):
CONF-8310121-
Journal Information:
Soc. Pet. Eng. AIME, Pap.; (United States), Vol. SPE11932; Conference: SPE annual technical conference, San Francisco, CA, USA, 5 Oct 1983
Country of Publication:
United States
Language:
English