Richard O Plumb

US Patent:

48887404, Dec 19, 1989

Filed:

May 30, 1986

Appl. No.:

6/869384

Inventors:

Alain Brie - Mendon, FR
Kai Hsu - Danbury CT
Richard A. Plumb - North Tarrytown NY

Assignee:

Schlumberger Technology Corporation - New York NY

International Classification:

G01S 130

US Classification:

367 30

Abstract:

A method for acoustically investigating characteristics of formations penetrated by a borehole such as fractures by taking differential Stoneley wave acoustic energy measurements between pairs of receivers of an array of receivers carried by a logging tool. The receivers of each pair all have the same spacing. The energy is that detected by the receivers in response to acoustic pulses generated by a transmitter spaced from the receivers on the tool. The differential energy measurements are stacked to obtain a stacked differential energy log.

US Patent:

48706272, Sep 26, 1989

Filed:

Dec 26, 1984

Appl. No.:

6/686127

Inventors:

Kai Hsu - Danbury CT
Alain Brie - Bethel CT
Richard A. Plumb - North Tarrytown NY

Assignee:

Schlumberger Technology Corporation - Ridgefield CT

International Classification:

G01V 100

US Classification:

367 69

Abstract:

A method and apparatus are described for generating a quick look display of an acoustic investigation of a borehole wherein a parameter of interest is derived from vertically spaced sonic receivers and displayed in a laterally continuous display log where the parameter values from respective receivers are recorded at preassigned positions. A fracture sensitive parameter is measured such as the energy in a low frequency Stoneley wave and when the parameter values are laterally recorded areas indicative of fractures become visually enhanced particularly with a laterally expanded display log. Techniques for the detection and evaluation of fractures are described.