Published May 18, 1994 | Version v1
Patent Metadata-only

Determining pore pressure while drilling a borehole

Creators

Description

Pore pressure Ppore of a subsurface formation is determined, while drilling a borehole, by measuring formation strength FS, resistivity RES and natural gamma ray activity GR. The measurement FS includes contributions of clay volume Vcl, non-clay mineral strength, and a porosity, the measurement RES includes contributions from a porosity, non-clay mineral volume Vsilt and pore fluid conductivity and the measurement GR includes contributions from clay and non-clay mineral, and the sum of Vcl, Vsilt and Φeff is 1. (Author)

Availability note (English)

Available from The Patent Office, Sales Branch, Unit 6, Nine Mile Point, Cwmfelinfach, Cross Keys, Newport, NP1 7HZ.

Additional details

Publishing Information

Imprint Pagination
11 p.
IPC:
Int. Cl. E21b 49/00.
IPC
Int. Cl. E21b 49/00.
Patent number
GB patent document 2272525/A/

INIS

Country of Publication
United Kingdom
Country of Input or Organization
United Kingdom
INIS RN
26000666
Subject category
S58: GEOSCIENCES;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
BOREHOLES; DRILLING; GAMMA RADIATION; MATHEMATICAL MODELS; NATURAL RADIOACTIVITY; PORE PRESSURE
Descriptors DEC
CAVITIES; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; RADIATIONS; RADIOACTIVITY

Optional Information

Secondary number(s)
GB patent application 9223917.7.