Method and apparatus for logging a borehole

Patent · Tue Jun 06 04:00:00 EDT 1989

OSTI ID:5536982

Morris, S A; Penn, J T

This patent describes a method for generating a signal containing information relating to the state of a borehole. The method consists of the type in which acoustic energy pulses are transmitted from the central portion of the borehole toward the borehole wall in a plurality of radial directions and at a plurality of different depths thereby generating reflected acoustic pulses from a reflecting boundary adjacent the borehole which are indicative of the condition of the reflecting boundary. The method consists of providing means in a downhole housing for substantially continuously rotating at a rate dependent upon a speed control signal supplied to the rotating means; providing a transducer assembly on the rotating means, the transducer assemble including means for generating such acoustic energy pulses and means for receiving such reflected acoustic pulses: generating in the housing a speed control signal for a selected controlled rate of substantially continuous rotation of the rotating means; providing the speed control signal to the rotating means; varying the rate of substantially continuous rotation of the rotating means while in the borehole; and generating and without interrupting scanning, varying the rate of generating periodic pulses firing signals for producing such acoustic energy pulses while in the borehole.

• Assignee: Amoco Corp., Chicago, IL
• Patent Number(s): US 4837753
• OSTI ID: 5536982
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
DESIGN
EQUIPMENT
EXPLORATION
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
OPERATION
PETROLEUM DEPOSITS
RESOURCES
SIGNAL CONDITIONING
SONIC LOGGING
WELL LOGGING
WELL LOGGING EQUIPMENT