DRILLING LOST CIRCULATION MATERIAL
First Claim
1. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particle size of from 300 to 1200 μ
- m, medium particles having an average particle size of from 20 to 150 μ
m and optionally fine particles having an average particle size of from 5 to 15 μ
m, and a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm.
1 Assignment
0 Petitions
Accused Products
Abstract
An engineered composition for reducing lost circulation in a well includes a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers. The long fibers are rigid and the short fibers are flexible. The long fibers form a tridimensional mat or net in the lost-circulation pathway that traps the mixture of particles and short flexible fibers to form a mudcake. The mixture of particles and blend of fibers may be added to water-based and oil-based drilling fluids. The composition, size, and concentration of each component of the mixture of particles and blend of fibers may be fine-tuned for each application.
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Citations
27 Claims
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1. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particle size of from 300 to 1200 μ
- m, medium particles having an average particle size of from 20 to 150 μ
m and optionally fine particles having an average particle size of from 5 to 15 μ
m, and a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- m, medium particles having an average particle size of from 20 to 150 μ
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14. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particles size of from 300 to 1200 μ
- m, medium particles having an average particles size of from 20 to 150 μ
m and optionally fine particles having an average particles size of from 5 to 15 μ
m, and a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm., and a drilling fluid. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- m, medium particles having an average particles size of from 20 to 150 μ
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25. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particle size of from 300 to 1200 μ
- m, medium particles having an average particle size of from 20 to 150 μ
m and fine particles having an average particle size of from 5 to 15 μ
m, and a blend of fibers having a Young'"'"'s Modulus of greater than about 20 GPa. - View Dependent Claims (26)
- m, medium particles having an average particle size of from 20 to 150 μ
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27. A method of reducing lost circulation in a well comprising adding a mixture coarse particles having an average particles size of from 300 to 1200 μ
- m, medium particles having an average particles size of from 20 to 150 μ
m and optionally fine particles having an average particles size of from 5 to 15 μ
m and adding a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm, to a drilling fluid and injecting the fluid into the well.
- m, medium particles having an average particles size of from 20 to 150 μ
Specification