Wells – Processes – Placing fluid into the formation
Patent
1992-12-22
1994-07-12
Suchfield, George A.
Wells
Processes
Placing fluid into the formation
1663051, E21B 4327
Patent
active
053279735
ABSTRACT:
A process for acidizing a formation where variable density acids are utilized. A substantially low density non-reactive fluid is loaded into an interval of the formation to be treated. Afterwards, a high density first stage acid is injected into the interval. Thereafter, a low density spacer fluid is injected into the interval being treated. Next, a second stage high density acid having a density lower than the first stage acid is injected into said interval. Subsequently, a low density spacer is injected into the interval. Volume increments are repeatedly injected with decreasing fluid densities until a desired zone has been treated. The entire treatment is then overflushed with an inert high density fluid.
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Hager Jr. George W.
Malone Charles A.
McKillop Alexander J.
Mobil Oil Corporation
Suchfield George A.
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