Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1994-12-22
1997-03-18
Springer, David B.
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507101, 507111, 507201, 507212, 507117, 175 72, C09K 702, C09K 700, E21B 4326, E21B 33138
Patent
active
056122934
ABSTRACT:
There is provided a method of drilling an oil or gas well, comprising drilling a wellbore into an underground formation in which a drill bit at the lower end of a drill pipe is placed at the bottom of the wellbore; pumping a first drilling fluid into the wellbore; determining the producing zone of the underground formation; and introducing a second drilling fluid into the wellbore through the drill pipe when the borehole is within the producing zone of the underground formation, wherein the second drilling fluid is a high density drill-in fluid, having a composition different from that of the first drilling fluid and including a brine system with at least one dissolved monovalent salt and at least one dissolved divalent salt together with a suspension polymer, said drilling fluid having a density of at least about 1.50 g/cm.sup.3 and a plastic viscosity of less than about 50 lbs/100 ft.sup.2.
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Stroh Stephen
Swartwout Rosa T.
Springer David B.
Tetra Technologies Inc.
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