US PATENT SUBCLASS 175 / 65
.~ Boring with specific fluid

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

57  DF  PROCESSES {5}
65.~ Boring with specific fluid {7}
66  DF  .~.~> Treating spent or used fluid above ground
67  DF  .~.~> Boring by fluid erosion
68  DF  .~.~> Anti-agglomeration treatment of gaseous drilling fluid
69  DF  .~.~> Combined liquid and gaseous fluid
70  DF  .~.~> Plural distinguishable liquids
71  DF  .~.~> Gaseous fluid or under gas pressure
72  DF  .~.~> Prevention of lost circulation or caving

DEFINITION

Classification: 175/65

(under subclass 57) Processes comprising providing a liquid or gaseous material in a borehole to facilitate the making of such borehole.

(1) Note. Since the use of some fluid in drilling is almost universal in this art, patents to be classified in this subclass must specifically describe some step involving more than the conventional use of fluid, for example, merely pumping or circulating fluid or screening cuttings from the fluid would be excluded but steps involving specifically described constituents of the fluid would be included.

(2) Note. The fluid may be for the purpose of lubricating the drill, removing the cuttings, preventing collapse of the bore wall, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

17, for processes and apparatus for heating or cooling drilling fluid.

64, and the search there noted for processes of causing a chemical reaction with the earth formation or drilling fluid constituent. 92+, for apparatus in which a below drive prime mover may be operated by drilling liquid flow.

207+, for above ground apparatus for handling or supplying drilling fluid to the borehole.

SEE OR SEARCH CLASS

166, Wells,

285+, for cementing, plugging or consolidating in a well and particularly Lines With Other Classes and Within This Class in the class definition of Class 166 for the line with Class 175 concerning drilling with fluid and cementing drilling with fluid and cementing and subclass 300 for placing two or more materials into a well which chemically react with each other.

184, Lubrication, appropriate subclasses for lubrication of general utility.

299, Mining or In Situ Disintegration of Hard Material,

16+, for a process of breaking down valuable or hard material by direct contact with fluid.

406, Conveyors: Fluid Current,

197, for processes of fluid current conveying.

507, Earth Boring, Well Treating, and Oil Field Chemistry,

100+, for well drilling compositions and earth boring processes which involve no more than the mere use of such compositions or a compound. 520, Synthetic Resins or Natural Rubbers, appropriate subclasses, particularly Class 523,

130+, for a composition containing a synthetic resin or natural rubber having utility in sealing fissures or crevices in stone, rock or other subterranean formations or in consolidating a formation in a well or in cementing a well or to processes or preparing said composition.