Continuous flow perforation washing tool and method

Patent · Tue May 28 04:00:00 EDT 1985

OSTI ID:6414890

Cochran, Ch B

A continuous flow well bore perforation washing tool is shown of the type having a tubular mandrel with sidewalls defining a flow passage, an upper end for connection in a pipe string and a lower end with means for blocking the flow of fluid from the pipe string through the mandrel. Upper and lower pressure responsive packer assemblies are carried on opposite ends of the mandrel. An outer setting sleeve surrounds the mandrel between the packer assemblies to define an annular chamber between the mandrel and setting sleeve. A continuous flow passage communicates the mandrel interior, the annular chamber, and the well bore. Selectively sized orifices in the setting sleeve form a restriction in a portion of the continuous flow passage. By selectively sizing the orifices, a back pressure buildup can be created in the annular chamber which is used to set the packer assemblies as fluid is continuously flowed through the continuous flow passage.

• Assignee: Hughes Tool Company
• Patent Number(s): US 4519456
• OSTI ID: 6414890
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACIDIZATION
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FIELD PRODUCTION EQUIPMENT
FLUID FLOW
FLUID INJECTION
NATURAL GAS WELLS
OIL WELLS
OPENINGS
ORIFICES
PACKINGS
PIPES
RESERVOIR ROCK
SLEEVES
STIMULATION
WATERFLOODING
WELL STIMULATION
WELLS