The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2017
Filed:
Oct. 16, 2013
Applicant:
Harr Technologies, Inc., Anchorage, AK (US);
Inventor:
Robert E. Harr, Kasilof, AK (US);
Assignee:
Harr Technologies, Inc., Anchorage, AK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 33/138 (2006.01); E21B 7/04 (2006.01); C09K 8/08 (2006.01); C09K 8/506 (2006.01); C09K 8/516 (2006.01); E21B 7/28 (2006.01);
U.S. Cl.
CPC ...
C09K 8/08 (2013.01); C09K 8/506 (2013.01); C09K 8/516 (2013.01); E21B 7/04 (2013.01); E21B 7/28 (2013.01); E21B 33/138 (2013.01);
Abstract
A drilling fluid composition for horizontal directional drilling is a flowable aqueous slurry of biodegradable, non-toxic, preferably edible plant particles. The particle size of the plant-derived particles depends on the drill bit used. The particles should be small enough not to clog the fluid jet orifices in normal use. The slurry is pumped through to the drill bit in a warm or preferably hot state, e.g. 80-100° C. After ejection, the slurry cools rapidly, causing solidification and creating a lining on the tunnel wall.