Acidizing method for gravel packing wells
A method for gravel packing perforations in a well is described which comprises: (a) introducing an acidizing agent into the formation's near wellbore area via perforations within the well which acidizing agent is of a strength sufficient to dissolve formation sand or fines in channels contained in said formation and perforations; (b) introducing thereafter, via three separate slugs, a sand consolidating agent comprising; (i) an aqueous solution of a silicate selected from a member of the group consisting of an alkali metal silicate, ammonium silicate or organoammonium silicate, (ii) a spacer volume of a water-immiscible hydrocarbonaceous liquid, and (iii) a water-miscible organic solvent containing an alkylpolysilicate and a member selected from the group consisting of an inorganic salt or chelated calcium in an amount sufficient to react with said organoammonium silicate, alkali metal or ammonium silicate so as to form a permeability retentive silicate cement of a strength sufficient to bind silica-containing particles therein and preclude formation sand from being produced from said area; (c) allowing the consolidation agent to remain in the perforations and said area for a time sufficient to form a cement having a porosity sufficient to prevent formation fines from entering said channels and perforations thereby permitting the production of substantially fines free hydrocarbonaceous fluids to the surface; and (d) performing thereafter a gravel packing operation, thereby further preventing any escaping sand or fines from said channels from being produced to the surface.
- Assignee:
- Mobil Oil Corp., Fairfax, VA (United States)
- Patent Number(s):
- A; US 5219026
- Application Number:
- PPN: US 7-810665
- OSTI ID:
- 6479628
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sand control agent and process
Consolidation agent and method
Related Subjects
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
BUILDING MATERIALS
CEMENTING
CEMENTS
DISSOLUTION
HYDROCARBONS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
OXYGEN COMPOUNDS
PERFORATION
PLUGGING
PLUGGING AGENTS
POROSITY
SAND
SILICATES
SILICON COMPOUNDS
SOLVENTS
WELL COMPLETION
WELLS