Title:
METHOD OF MANUFACTURING PREPARING AGENT FOR RECYCLING MUDDY WATER
Document Type and Number:
Japanese Patent JPS5220983
Kind Code:
A
Abstract:
Weighting material for a drilling fluid, e.g. a drilling mud, is produced by firing iron oxide solids, e.g. iron oxide ores, calcined pyritic ores or iron-oxide-containing products of other metallurgical processes, in a circulating fluidized bed or rotary furnace at a temperature of 1210 DEG C to 1400 DEG C in an oxidizing atmosphere in which the oxygen content is augmented to transform magnetitic components to oxides of lower magnetic susceptibility. The product is then cooled slowly at least until it reaches a temperature of 780 DEG C, also in an oxidizing atmosphere. The weighting materials have extremely low magnetic susceptibility and thus can be used without interfering with inductive monitoring of the position of the drill string.
Inventors:
HANSU IYOAHIMU REERUBORUN
RAINAA HOMAN
HERIBERUTO KONRADEI
DEIITAA MENRERU
RAINAA HOMAN
HERIBERUTO KONRADEI
DEIITAA MENRERU
Application Number:
JP7594876A
Publication Date:
February 17, 1977
Filing Date:
June 25, 1976
Export Citation:
Assignee:
METALLGESELLSCHAFT AG
International Classes:
C09K8/03; C22B1/02; C09K8/02; E21B21/00; (IPC1-7): C09K7/00