Cement compositions and methods
AssigneeSchlumberger Technology Corporation
InventorsYan Gao, Dominic Vincent Perroni, Anatoly Vladimirovich Medvedev, Andrey Vladimirovich Yakovlev
Life of this patent
Estimating the term…
Abstract
Cement slurries are prepared that comprise water, a hydraulic cement, particles of an oil-absorbent particles and non-swellable hydrophobic particles. The particles are present in an amount sufficient to alter a property of a non-aqueous drilling fluid. The cement slurry is placed in a subterranean well, whereupon the slurry contacts residual drilling fluid on casing and formation surfaces. The oil-absorbent particles and hydrophobic particles in the cement slurry may reduce the mobility of the drilling fluid, thereby improving zonal isolation.
Claims15
A method for cementing a subterranean well, comprising:
- placing a cement slurry comprising water, a hydraulic cement, oil-absorbent particles, and non-swellable hydrophobic fibers having a length between 500 μm and 20 mm, and a diameter between 100 nm and 1 mm within the subterranean well, wherein the oil-absorbent particles are elongated, having an aspect ratio between 15 and 1000 before swelling, and between 5 and 350 after swelling, and wherein the oil-absorbent particles contact a non-aqueous component of a drilling fluid within the subterranean well and decrease a property of flowability of the non-aqueous component of the drilling fluid.
A method comprising:
- placing casing within a subterranean well;
- providing a cement slurry comprising water, a hydraulic cement, oil-absorbent particles, and non-swellable hydrophobic fibers having a length between 500 μm and 20 mm, and a diameter between 100 nm and 1 mm within the subterranean well,
- wherein the oil-absorbent particles are elongated, having an aspect ratio between 15 and 1000 before swelling, and between 5 and 350 after swelling, and
- wherein the oil-absorbent particles contact a non-aqueous component of residual drilling fluid on the casing and formation surfaces of the subterranean well to decrease a property of flowability of the non-aqueous component of the residual drilling fluid.
Dependencies are inferred from the claim text.