Wells – Processes – Placing fluid into the formation
Patent
1990-02-28
1991-04-09
Novosad, Stephen J.
Wells
Processes
Placing fluid into the formation
166177, 166317, E21B 4326, E21B 43267
Patent
active
050056492
ABSTRACT:
The present invention achieves a more reliable multiple fracturing of a subterranean formation by inserting high pressure tubing and isolating a portion of the wellbore (including the formation of interest and an end portion of the tubing) with packers. Near the end of the tubing is a closable end and a rupturable plenum holding a sufficient volume of pressurized gas to produce a pressure ramp sufficient to cause multiple fractures in the isolated portion when the plenum is ruptured. The closable end is closed after filling the isolated portion with a fracture fluid and proppant. The rupturable means is provided by at least one rupture disc. Multiple discs can provide a step wise pressure rise ramp to tailor the multiple fracture producing pulse. By providing a known volume of pressurized gas and rupture discs, a controlled pulse loading can be achieved. Like the propellant driven pulse loading techniques, it achieves a pressure ramp, but the present invention avoids the damage potential and improves the reliability of creating multiple fractures. The present invention can also be easily modified for alternative applications and is also expected to be safe, tolerant of off-design conditions, cost effective, and efficient.
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"Hydraulic Fracturing", by G. C. Howard & C. R. Fast, 1970, American Institute of Mining, Metallurgical & Petroleum Engineers, Chapters 7 & 8, pp. 91-136.
"Multiple Fracturing of Boreholes by Using Tailored-Pulse Loading," by R. P. Swift and A. S. Kusubov, Society of Petroleum Engineers Journal, Dec. 1982, pp. 923-932.
Jacobson William O.
Smith John C.
Jacobson William O.
Novosad Stephen J.
Union Oil Company of California
Wirzbicki Gregory F.
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