Methods, well cement compositions and lightweight additives therefor
First Claim
1. A method of sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressures comprising the steps of:
- (a) providing a lightweight cement composition comprised of a hydraulic cement, mix water and an additive comprising an aqueous suspension of microspheres containing a water swellable clay suspending agent;
(b) placing said cement composition between the exterior surfaces of said pipe and the walls of said well bore; and
(c) allowing said cement composition to set into a hard impermeable mass.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the steps of providing a lightweight cement composition comprised of a hydraulic cement, water and an additive comprising an aqueous suspension of microspheres containing a water swellable clay suspending agent, placing the cement composition in the annulus between the pipe and the well bore and allowing the cement composition to set.
80 Citations
28 Claims
-
1. A method of sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressures comprising the steps of:
-
(a) providing a lightweight cement composition comprised of a hydraulic cement, mix water and an additive comprising an aqueous suspension of microspheres containing a water swellable clay suspending agent;
(b) placing said cement composition between the exterior surfaces of said pipe and the walls of said well bore; and
(c) allowing said cement composition to set into a hard impermeable mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of cementing in a subterranean formation comprising the steps of:
-
(a) providing a cement composition comprising a hydraulic cement, water and an additive comprising an aqueous suspension of microspheres containing a water swellable clay suspending agent;
(b) placing said cement composition in the subterranean formation; and
(c) allowing said cement composition to set. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method of cementing in a subterranean formation comprising the steps of:
-
(a) providing a cement composition comprising a hydraulic cement, water and an additive present in said composition in an amount in the range of from about 30% to about 100% by weight of hydraulic cement comprising an aqueous suspension of microspheres containing a water swellable clay suspending agent selected from the group consisting of attapulgite, kaolinite, meta-kaolinite, hectorite and sepiolite;
(b) placing said cement composition in the subterranean formation; and
(c) allowing said cement composition to set. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
-
Specification