Sand control agent and process

Patent · Tue Apr 07 04:00:00 EDT 1992

OSTI ID:5153084

Shu, P; Donlon, W P; Strom, E T

This patent describes a method for forming a gravel pack in a washed-out interval adjacent a borehole in an unconsolidated or loosely consolidated formation. It comprises perforating a cased borehole at an interval of the formation having a washed-out interval adjacent the borehole; placing sand into the washed-out interval via perforations in the borehole; 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 having a porosity sufficient to exclude formation fines or sand; and injecting thereafter via the perforations a solvent containing a calcium salt into the interval containing sand in an amount sufficient to react with the alkali metal silicate at an interface with the solvent so as to form a calcium silicate cement which binds the sand whereupon the porosity of the sand-containing interval is reduced to a size sufficient to exclude the fines or sand while retaining the formation's permeability as the interface flows evenly and continually through the formation.

• Assignee: Mobil Oil Corp., Fairfax, VA (United States)
• Patent Number(s): US 5101901; A
• Application Number: PPN: US 7-622587
• OSTI ID: 5153084
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALCOHOLS
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
CALCIUM
CHEMICAL REACTION KINETICS
CONTROL SYSTEMS
DISPERSIONS
DRILLING
DRILLING FLUIDS
ELEMENTS
FLUID INJECTION PROCESSES
FLUIDS
HYDROXY COMPOUNDS
KINETICS
METALS
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
REACTION KINETICS
SAND
SILICATES
SILICON COMPOUNDS
SOLUTIONS
WELL COMPLETION
WELL DRILLING
WELLS