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-10450495-B2
Application number	US-201816171133-A
Country	US
Kind code	B2
Filing date	Oct 25, 2018
Priority date	Jan 24, 2018
Publication date	Oct 22, 2019
Grant date	Oct 22, 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 method of treating a loss circulation zone in a subterranean formation, the method comprising:
a) forming a foamed cementitious composition comprising:
calcium aluminate;
a nitrogen gas-generating compound;
an amine activator comprising an ethyleneamine; and
a foam surfactant; and

b) introducing the foamed cementitious composition into the loss circulation zone.

2. The method of claim 1 , wherein the nitrogen gas-generating compound is an azo compound.

3. The method of claim 2 , wherein the azo compound is about 1% to about 10% by weight of the calcium aluminate.

4. The method of claim 1 , wherein the ethyleneamine comprises tetraethylenepentamine (TEPA).

5. The method of claim 2 , wherein the weight ratio of the azo compound to the amine activator is about 5:1 to about 1:5.

Assignees

• Saudi Arabian Oil Co

Inventors

• Reddy B Raghava

Classifications

• C04B38/02

  by adding chemical blowing agents · CPC title

• C04B28/06

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

• C09K8/487 Primary

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

• C04B7/32

  Aluminous cements · CPC title

• E21B33/13

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