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

• US 10,450,495 B2
• Filed: 10/25/2018
• Issued: 10/22/2019
• 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): McDonough, James E
• Application Number:
  US16/171,133
• Publication Number:
  US 20190225862A1
• Time in Patent Office: 362 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 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.