Wells – Processes – Separate steps of fracturing or attacking formation
Patent
1993-02-22
1994-10-11
Suchfield, George A.
Wells
Processes
Separate steps of fracturing or attacking formation
166 50, 166282, E21B 4325
Patent
active
053538749
ABSTRACT:
A method of treating a downhole formation in a wellbore having multiple zones of porosity by circulating a carrier fluid downhole to the lowermost zone of porosity, and then flowing an acid soluble blocking agent into the wellbore. The blocking agent is translocated to a location where it is free to flow along the lower end of the borehole and seal the zones of porosity. The blocking agent is a mixture of acid soluble material that is relatively insoluble in the carrier fluid, and is of a size to block the pores of the zones of porosity so that flow into the zones is severely reduced. A solution of acid is spotted downhole within a selected zone of porosity. The solution of acid degrades the blocking agent and the degraded blocking agent becomes admixed with the carrier fluid and the flow restriction of the blocking agent within the zone is destroyed. Next a treatment fluid for stimulating the selected zone is conveyed downhole and forced into the opened selected zone until the zone is stimulated. The residual blocking agent is removed from the borehole by circulating a solution of acid downhole and into contact with the acid soluble material that is blocking the untreated pores of the zones of porosity and opens all of the zones to the borehole.
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