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Green directional drilling fluid composition

a technology of green directional drilling and composition, applied in the direction of directional drilling, borehole/well accessories, insulation, etc., can solve the problems of slurry itself being edible or not edibl

Inactive Publication Date: 2010-07-22
HARR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]A drilling fluid composition of the invention usable in horizontal directional drilling, consists essentially of: from 10% to 50% by weight of plant particles having a size to pass through drill head orifices, and the balance is essentially water. These and other aspects of the invention are discussed in the detailed description that follows.

Problems solved by technology

However, the slurry itself may or may not be edible, even though it is non-toxic and biodegradable.

Method used

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[0016]An aluminum circulation tank is filled with 700 gallons of water. The tank is set up with heating coils heated by a propane burner. The water is heated to a temperature in the range of 80 to 100° C., and then the grain mix is added. About 2 pounds of grain mix per gallon of water is sufficient for a good soil condition, more in poorer soil. ½ pound of beet pulp that passes through a 0.080 or 14 gage mesh screen per gallon of water is used to aid in loss circulation. The grain powder is sized to pass through a 180 to 200 mill screen no larger than 0.032 inch or 21 gage. Recirculation water jets circulate the water the bottom of the tank in a stirring motion. A large rotating mixer beater is set up to stir the center of the tank. The grain powder and beet pulp are slowly added to the water-jetted blender.

[0017]The drilling fluid of the present invention is a biodegradable aqueous slurry of particles of plant material. Plant particles that are both edible and non-toxic are strong...

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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.

Description

TECHNICAL FIELD[0001]This invention relates to drilling fluid of the kind used in commercial directional drilling.BACKGROUND OF THE INVENTION[0002]Directional boring, often called horizontal directional drilling (HDD), is in common use for installation of pipelines, cables and culverts. Such operations are often undertaken in environmentally sensitive places such as under rivers and near residential areas. The need for biodegradable, low toxicity fluids for use in oil and gas drilling operations has been recognized, as in U.S. Pat. No. 7,392,844. Such drilling fluids are made of organic chemicals: liquids, polymers and the like suited for down hole drilling. Drilling fluids for directional drilling are entirely different and not comparable to those used in down hole drilling. HDD fluid is used to lubricate a drill bit by ejection from orifices in the bit, and in some machines is used to power the drill, i.e. a so called mud motor drill. The mud once ejected from the bit flows into t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B7/00E21B7/28E21B7/04
CPCC09K8/08C09K8/506E21B33/138E21B7/04E21B7/28C09K8/516
Inventor HARR, ROBERT E.
Owner HARR TECH
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