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

• US 10,400,154 B2
• Filed: 01/24/2019
• Issued: 09/03/2019
• Est. Priority Date: 01/24/2018
• Status: Active Grant

• Current Assignee: Saudi Arabian Oil Company (Government of Saudi Arabia)
• Original Assignee: Saudi Arabian Oil Company (Government of Saudi Arabia)
• Inventors: Reddy, B. Raghava
• Primary Examiner(s): Green, Anthony J
• Application Number:
  US16/256,532
• Publication Number:
  US 20190225864A1
• Time in Patent Office: 222 Days
• CPC Class Codes: C04B 2103/40 Surface-active agents, dispersants
• CPC Class Codes: C04B 2103/46 Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
• CPC Class Codes: C04B 24/12 Nitrogen containing compounds organic derivatives of hydrazine hydrazine C04B22/00
• CPC Class Codes: C04B 24/129 Compounds containing one or more nitrogen-to-nitrogen double bonds, e.g. azo-compounds
• CPC Class Codes: C04B 28/06 Aluminous cements monolithic refractories or refractory mortars C04B35/66
• CPC Class Codes: C04B 38/02 by adding chemical blowing agents
• CPC Class Codes: C04B 7/32 Aluminous cements
• CPC Class Codes: C09K 8/473 Density reducing additives, e.g. for obtaining foamed cement compositions
• CPC Class Codes: C09K 8/487 Fluid loss control additives; Additives for reducing or preventing circulation loss
• CPC Class Codes: E21B 33/13 Methods or devices for cementing, for plugging holes, crevices or the like

Abstract

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

Claims

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.