Settable, form-filling loss circulation control compositions comprising in situ foamed calcium aluminate cement systems and methods of using them

Patent metadata

Field	Value
Publication number	US-10400154-B2
Application number	US-201916256532-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Jan 24, 2018
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

This document relates to settable, hydraulic, non-Portland foamed cement compositions comprising nitrogen gas-generating compositions used for loss circulation control.

First claim

What is claimed is:

1. A cementitious composition comprising:
calcium aluminate comprising greater than or about 68.5% alumina and less than or about 31% calcium oxide;
a nitrogen gas-generating compound in an amount of about 1% to about 10% by weight of the calcium aluminate, the nitrogen gas-generating compound comprising an azo compound;
an amine activator to accelerate generation of gas from the nitrogen gas-generating compound, the amine activator comprising an ethyleneamine, wherein a weight ratio of the azo compound to the amine activator is about 5:1 to about 1:5; and
a foam surfactant.

2. The composition of claim 1 , comprising a viscosifier comprising xanthan or diutan, or a combination thereof.

3. The composition of claim 1 , wherein the foam surfactant comprises an alkyl salt or cocoamidopropyl hydroxysultaine, or a combination thereof.

4. The composition of claim 1 , wherein the ethyleneamine comprises ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), or tetraethylenepentamine (TEPA), or any combinations thereof.

5. The composition of claim 4 , wherein the foam surfactant comprises a surfactant solution added as 1% to 10% by volume of mix water to the cementitious composition.

Assignees

• Saudi Arabian Oil Co

Inventors

• Reddy B Raghava

Classifications

• C09K8/487 Primary

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title

• E21B33/13

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• C04B28/06

  Aluminous cements (monolithic refractories or refractory mortars C04B35/66) · CPC title

• C04B38/02

  by adding chemical blowing agents · CPC title

• C04B7/32

  Aluminous cements · CPC title