Method and apparatus for obtaining selected samples of formation fluids

Patent · Tue Jan 13 00:00:00 EST 1987

OSTI ID:7001658

Jageler, A H

A method is described for obtaining formation fluid samples from a borehole, comprising: (a) lowering a tool suspended by a wireline into the borehole to a preselected level; (b) utilizing a pair of packers carried by the tool to isolate an interval of the borehole by inflating the packers to expand them into sealing contact with the borehole; (c) withdrawing fluid from the isolated interval and measuring its resistivity in a first test chamber within the tool; (d) when the resistivity measurement becomes constant, indicating that formation fluid uncontaminated by drilling mud components is being withdrawn into the tool, directing the withdrawn fluid into a second test chamber and measuring therein selected physical properties of the fluid; (e) determining from the selected property measurements whether it is desired to retain a sample and, if the determination is positive, pumping the fluid to a sample collection chamber associated with the tool; (f) deflating the pair of packers to free the tool for vertical movement; and (g) retracting the wireline to return the tool and the collected sample to the surface.

• Assignee: Amoco Corp., Chicago, IL
• Patent Number(s): US 4635717
• OSTI ID: 7001658
• Resource Relation: Patent File Date: Filed date 9 May 1985
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
BOREHOLES
SAMPLERS
PETROLEUM DEPOSITS
SAMPLING
WELL LOGGING
RESERVOIR FLUIDS
DRILLING FLUIDS
HOISTING
HYDRAULIC CONDUCTIVITY
INFLATABLE SEALS
PACKINGS
PHYSICAL PROPERTIES
CAVITIES
EQUIPMENT
FLUIDS
GEOLOGIC DEPOSITS
MATERIALS HANDLING
MINERAL RESOURCES
RESOURCES
SEALS
020200* - Petroleum- Reserves
Geology
& Exploration