Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2007-10-09
2007-10-09
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S070000
Reexamination Certificate
active
10888558
ABSTRACT:
The present invention generally provides an inexpensive method for drilling a multilateral wellbore where the pressure exerted on a formation of interest by a column of drilling fluid may be controlled. In one aspect, a method for drilling a lateral wellbore from a main wellbore is provided, including running a string of casing with an injection line connected thereto into the main wellbore, wherein the injection line is disposed along an outer side of the casing and a portion of the casing corresponding to a starting depth of the lateral wellbore is made from a drillable material; running a drillstring through the casing to the starting depth of the lateral wellbore, wherein the drillstring comprises a drill bit; injecting drilling fluid through the drill sting; and injecting a second fluid, having a density less than that of the drilling fluid, through the injection line at a rate corresponding to an injection rate of the drilling fluid to control hydrostatic pressure exerted by a column of the drilling fluid and the second fluid returning through the casing.
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Bailey Tom
Coy Alejandro
Divine Ron
Johnson Darrell
Terry Jim
Patterson & Sheridan L.L.P.
Tsay Frank
Weatherford/Lamb
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