US 6,631,766 B2 · Methods, well cement compositions and lightweight additives therefor

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.

Claims28

Dependent claims

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 more element

Dependencies are inferred from the claim text.

Facts

Application

10/103,449Filed 21 Mar 2002 · continuation in part

Priority

3 Dec 2001

Published

US 2003/0101911 A15 Jun 2003

Granted

14 Oct 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

C04B 28/02
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…
C09K 8/42
Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations:…
C09K 8/46
Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells: containing inorganic…
C09K 8/473
Containing additives for specific purposes: density reducing additives, e.g. for obtaining foamed cement compositions

Family

Application10/005,266Parent of this continuation-in-part · filed 3 Dec 2001

US 2003/0101912 A1Pre-grant publication · published 5 Jun 2003

US 2003/0101911 A1Published application

US 6,601,647 B2Related patent

US 6,631,766 B2This patent

From the US filing history. Foreign family members aren’t listed.

Methods, well cement compositions and lightweight additives therefor

Life of this patent

Methods, well cement compositions and lightweight additives therefor

Life of this patent

Abstract

Claims28