Sand consolidation methods
This patent describes a method for consolidating unconsolidated mineral particles including sand in a subterranean petroleum formation penetrated by a well in fluid communication with at least a portion of the formation. It comprises: introducing an effective amount of a preflush into the formation sufficient to invade substantially all of the pore spaces of a portion of the formation to be consolidated. The preflush fluid comprises an ester which is a solvent for oil residue on the sand grains and removing at least a portion of water present in the pore spaces of the formation; thereafter introducing a sand consolidating fluid into substantially the same portion of the formation as the preflush fluid, the sand consolidating fluid containing a polymerizable compound, a diluent for the polymerizable compound and an acid catalyst capable of causing condensation polymerization of the compound at fluid injection temperatures; and allowing the injected fluid to remain in the formation for a period of time sufficient to accomplish at least partial polymerization of the monomer, forming a permeable consolidated mass around the wellbore.
- Assignee:
- Texaco Inc., White Plains, NY (USA)
- Patent Number(s):
- US 4938287; A
- Application Number:
- PPN: US s 7-425137
- OSTI ID:
- 6573172
- Country of Publication:
- United States
- Language:
- English
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Sand consolidation methods
Sand consolidation methods