Consolidation agent and method
This patent describes a sand consolidating method for an unconsolidated or loosely consolidated formation. It comprises perforating a cased borehole at an interval expected to produce fines or sand when producing hydrocarbonaceous fluids from the interval; injecting an aqueous solution of an alkali metal silicate into the interval through perforations contained in the borehole which solution is of a strength sufficient to react with an alcoholic solution of calcium salt to form a permeability retention cement; and injecting thereafter a solvent containing a calcium salt into the interval via the perforations in an amount sufficient to react with the alkali metal silicate so as to form a calcium silicate cement with permeability retention characteristics whereupon the interval is consolidated in a manner sufficient to prevent formation sand from being produced from the formation during the production of hydrocarbonaceous fluids, which solvent is selected from a member of the group consisting of methanol, ethanol, higher alcohols, ketones, tetrahydrofuran, and dimethyl sulfoxide.
- Assignee:
- Mobil Oil Corp., Fairfax, VA (United States)
- Patent Number(s):
- US 5088555; A
- Application Number:
- PPN: US 7-622586
- OSTI ID:
- 5288778
- Resource Relation:
- Patent File Date: 3 Dec 1990
- Country of Publication:
- United States
- Language:
- English
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AQUEOUS SOLUTIONS
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