Method and apparatus for determining the magnitude of components of measurements made from inside a borehole

Patent · Tue Feb 28 00:00:00 EST 1989

OSTI ID:6021450

Hsu, K; Wiggins, R

A method is described for determining values of the slowness of an earth formation as a function of depth from time measurements, comprising the steps of: detecting first motions in the waveforms related to a desired depth range to produce time measurements representative of the total travel time of an acoustic wave from the transmitter to a sonic receiver: defining for each time measurement a plurality of factors that make up the time measurement and include the travel time of the acoustic wave, through the borehole at the transmitter through successive preselectively sized depth intervals of the earth formation located between the transmitter, and the sonic receiver, and through the borehole at the sonic receiver; and defining coefficients for representative of the relative contributions of the different factors that make up each time measurement so as to define a first matrix of coefficients, one dimension of which is a function of the intervals extending along the depth range and another dimension of which is a function of the measurements as made along the depth range.

• Assignee: Schlumberger Technology Corp., Ridgefield, CT
• Patent Number(s): US 4809236
• OSTI ID: 6021450
• Resource Relation: Patent File Date: Filed date 15 Oct 1986
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
NATURAL GAS WELLS
ACOUSTIC MEASUREMENTS
OIL WELLS
SONIC PROBES
BOREHOLES
CALCULATION METHODS
DEPTH
PULSE TECHNIQUES
SOUND WAVES
TIME MEASUREMENT
WAVE FORMS
CAVITIES
DIMENSIONS
PROBES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing