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1. (WO1998051901) CONDUIT CLEANING MATERIAL AND PROCESS

Pub. No.:    WO/1998/051901    International Application No.:    PCT/GB1998/001229
Publication Date: Fri Nov 20 00:59:59 CET 1998 International Filing Date: Wed Apr 29 01:59:59 CEST 1998
IPC: E21B 37/00
Applicants: SOFITECH N.V.
COMPAGNIE DES SERVICES DOWELL SCHLUMBERGER S.A.
SCHLUMBERGER CANADA LIMITED
JOHNSON, Ashley, Bernard
Inventors: JOHNSON, Ashley, Bernard
Title: CONDUIT CLEANING MATERIAL AND PROCESS
Abstract:
Novel abrasive particles for cleaning conduits, particularly subterranean wellbores are described. The particles are rounded, preferably spherical, and have a hardness of 80 to 200 Vickers. The particles are preferably made of non-metallic material such as Calcite pellets. The new abrasives cause significantly less damage to the well tubulars than sand.