DRILLING FLUID AND METHOD FOR DRILLING IN COAL-CONTAINING FORMATIONS
First Claim
Patent Images
1. A method for drilling in a coal containing formation, the method comprising:
- providing a mixed metal-viscosified drilling fluid at least 0.05% (w/v) calcium sulfate;
circulating the drilling fluid through the well; and
drilling into the coal seam.
3 Assignments
0 Petitions
Accused Products
Abstract
A drilling fluid and method for drilling in a coal containing formation. The method includes: providing a mixed metal-viscosified drilling fluid including at least 0.05% calcium sulfate; circulating the drilling fluid through the well; and drilling into a coal seam.
25 Citations
27 Claims
-
1. A method for drilling in a coal containing formation, the method comprising:
-
providing a mixed metal-viscosified drilling fluid at least 0.05% (w/v) calcium sulfate; circulating the drilling fluid through the well; and drilling into the coal seam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A drilling fluid comprising:
-
an aqueous mixture of bentonite and a mixed metal viscosifier with a pH above about pH 10; and at least 0.05% calcium sulfate (w/v). - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification