Method for reducing permeability restriction near wellbore

Details Method for reducing permeability restriction near wellbore Method for reducing permeability restriction near wellbore

2005-09-20

2005-09-20

Suchfield, George (Department: 3672)

Wells

Processes

Cyclic injection then production of a single well

C166S250010, C166S305100, C166S308100, C166S371000, C507S202000, C507S266000

Reexamination Certificate

active

06945327

ABSTRACT:
Method is provided for increasing the productivity of gas wells producing from reservoirs where retrograde condensation occurs around the wells. An oil-wetting surfactant is injected in a solvent to oil wet the formation for a selected distance around a well or a hydraulic fracture intersecting the well. A pre-flush liquid, such as carbon dioxide, alcohol or similar products and mixtures thereof, may be used to reduce water saturation before injection of the surfactant. The method may also be applied to increase the productivity of oil wells producing from reservoirs where breakout of solution gas occurs near the well.

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“Wellbore Liquid Blockage in Gas-Condensate Reservoirs”, SPE 51050, 1998.
“Condensate Banking Dynamics in Gas Condensate Fields: Compositional Changes and Condensate Accumulation Around Production Wells”, SPE 62930, 2000.

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