Methods and compositions for forming permeable cement sand screens in well bores
AssigneeHalliburton Energy Sevices, Inc.
InventorsJiten Chatterji, Roger S. Cromwell, Baireddy R. Reddy, Bobby J. King, Philip D. Nguyen, David L. Brown
Life of this patent
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Abstract
Methods and compositions for forming permeable cement sand screens in well bores are provided. The compositions are basically comprised of a hydraulic cement, an acid soluble particulate solid, a liquid hydrocarbon solvent soluble particulate solid, a particulate cross-linked gel containing an internal breaker which after time causes the gel to break into a liquid, water present in an amount sufficient to form a slurry, a gas present in an amount sufficient to form a foam and a mixture of foaming and foamed stabilizing surfactants.
Claims14
A method of forming a permeable cement sand screen in a well bore comprising the steps of:
- (a) preparing a foamed cement composition comprised of a hydraulic cement, an acid soluble particulate solid, a liquid hydrocarbon solvent soluble particulate solid, a particulate cross-linked gel containing an internal breaker which after time causes said gel to break into a liquid, water present in an amount sufficient to form a slurry, a gas present in an amount sufficient to form a foam and a mixture of foaming and foam stabilizing surfactants;
- (b) placing said foamed cement composition prepared in step (a) in said well bore adjacent to a fluid producing interval or zone and allowing said cement composition to set therein;
- (c) allowing said particulate cross-linked gel containing said internal breaker to break whereby vugs and channels are formed in said set cement;
- and thereafter
- (d) contacting said set cement with an acid and a liquid hydrocarbon solvent so that said acid and liquid hydrocarbon solvent enter said vugs and channels and dissolve said acid soluble particulate solid and said liquid hydrocarbon solvent soluble particulate solid in said set cement whereby said set cement is permeated.
Dependencies are inferred from the claim text.