Methods and apparatus for measuring a length of cable suspending a well logging tool in a borehole

Patent · Tue Jul 01 04:00:00 EDT 1986

OSTI ID:5435293

Broding, R A

A system is described for measuring depth from the mouth of a borehole to a well logging tool connected to one end of an electrically conductive cable suspended in the borehole comprising: means for applying an initial electrical time pulse signal to one end of the cable, whereby the initial electrical time pulse signal propagates the length of the cable to one end of the cable to the well logging tool connected to the other end of the cable; means for detecting at the mouth of the borehole, which is intermediate both ends of the cable, the passage of the initial electrical time pulse signal along the length of the cable; means for detecting at the mouth of the borehole a subsequent electrical time pulse propagating along the length of the cable reflected from the other end of the cable; means for determining a time interval between the detection of the initial electrical time pulse signal at the mouth of the borehole and the detection of the subsequent electrical time pulse signal at the mouth of the borehole; and means for correlating the time interval with the depth to which the well logging tool is suspended in the borehole as measured from the mouth of the borehole.

• Assignee: Standard Oil Co., Chicago, IL
• Patent Number(s): US 4597183
• OSTI ID: 5435293
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
BOREHOLES
CABLES
CAVITIES
CONDUCTOR DEVICES
DEPTH
DIMENSIONS
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
EQUIPMENT
GEOLOGIC DEPOSITS
LENGTH
MINERAL RESOURCES
PETROLEUM DEPOSITS
PULSES
RESOURCES
SIGNALS
TIMING PROPERTIES
WELL LOGGING
WELL LOGGING EQUIPMENT