Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1979-08-21
1980-08-19
Leppink, James A.
Boring or penetrating the earth
Processes
Boring with specific fluid
252 85LC, E21B 33138
Patent
active
042179653
ABSTRACT:
A method is disclosed for preventing loss of aqueous drilling fluid to porous formations penetrated by a well bore during drilling operations for oil and gas. The method utilizes readily available pelleted cottonseed hulls as the lost circulation material which is added to the drilling fluid and pumped down the well bore. The pelleted cottonseed hulls are composed of cottonseed hulls, cottonseed meal, bentonite, a residual amount of cottonseed lint and a surface active agent. The cottonseed hulls, cottonseed meal, bentonite, residual lint and surface active agent are heated in the presence of steam and compressed to form pellets. Because the pellets are in a compressed form, they do not expand when added to the drilling fluid until they are well down the well bore. The pelleted cottonseed hulls may also contain cottonseed oil. The pelleted cottonseed hulls are well known and widely used in the dairy cattle industry as a pelleted feed material.
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Leppink James A.
Suchfield George A.
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