Schlumberger Technology Corporation

Baker Hughes Corporation

Hutchinson, Mark W.

Mark W Hutchinson

Jean-Michel Hache

Kais Gzara

Russel R Randall

David M Schneider

Iain M Rezmer-Cooper

Steven L Hobart

The present invention presents a method that effectively provides the near real-time advantage of annular pressure while drilling (APWD) measurements taken during pipe connections that require the mud circulation pumps to be turned off (a &ldquo;pumps-off&rdquo; condition). APWD data, such as pressure measurements, are obtained from instruments and related electronics within the bottom-hole assembly (BHA). APWD data can be measured, stored and even processed in the BHA during a pumps-off condition for subsequent processing or communication of a reduced amount of data to the driller at the surface.

Method for determining equivalent static mud density during a connection using downhole pressure measurements

The present invention relates to the transformation of measurement while drilling (MWD) data acquired during various time intervals into corresponding equal depth intervals. Once the data are transformed into the depth domain, depth based statistical, filtering sensor resolution matching and depth shifting techniques are utilized. The transformation process maximizes sensor vertical resolution while minimizing observed and statistical errors associated with sensor response.

Comprehensive method of processing measurement while drilling data from

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Houston, TX, United States of America

Mark W Hutchinson