Boring or penetrating the earth – With heating or cooling drilling fluid
Reexamination Certificate
2005-09-06
2005-09-06
Suchfield, George (Department: 3672)
Boring or penetrating the earth
With heating or cooling drilling fluid
C166S288000, C166S300000, C166S302000, C175S064000, C175S072000
Reexamination Certificate
active
06938707
ABSTRACT:
A method and a system for minimizing circulating fluid return losses during drilling of a well bore are disclosed. Circulating fluid, or mud, is heated above conventional temperatures for circulating fluids. The heated circulating fluid then contacts a region of a formation, in which a well bore is to be drilled, maintaining the formation at a relative higher temperature than if no special sources of heat were used to add heat to the circulating fluid. The region, at the relatively higher temperature, has a tendency to expand and to be placed in a relatively higher compressive state as compared to a formation at a lower temperature. Consequently, the use of the heated circulating fluid minimizes fracture initiation and growth and circulation fluid losses into the formation.
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Bloys James B.
Gonzalez Manuel E.
Lofton John
Pepin Gregory P.
Schmidt Joseph H.
Chevron U.S.A. Inc.
Schulte Richard J.
Suchfield George
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