Lost circulation test method for expandable geopolymers

Patent metadata

Field	Value
Publication number	US-11851606-B2
Application number	US-202117452734-A
Country	US
Kind code	B2
Filing date	Oct 28, 2021
Priority date	Oct 28, 2021
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

The disclosure includes a new test method of evaluating lost circulation prevention with expandable geopolymers. The expandable geopolymer is tested using a permeability plugging tester, slot disk, drilling fluid, and a piston to determine how much fluid is released from the test cell.

First claim

What is claimed is:

1. A method of testing an expandable geopolymer lost circulation material comprising
obtaining a permeability plugging tester, wherein the permeability plugging tester comprises a test cell;
loading a drilling fluid to a lower part of the test cell, wherein the drilling fluid is on top of a piston located in the test cell;
placing a glass paper on top of the drilling fluid;
loading a geopolymer on top of the glass paper;
increasing temperature within the test cell, wherein the geopolymer expands and solidifies;
applying pressure from the piston; and
testing lost circulation prevention capability of the expandable geopolymer, comprising collecting and measuring how much of the drilling fluid comes out of the test cell.

2. The method of claim 1 wherein the drilling fluid is oil-based.

3. The method of claim 1 wherein the pressure is from 2000-5000 psi.

4. The method of claim 3 wherein the pressure is at 4000 psi.

5. The method of claim 1 wherein the geopolymer has a 10% expansion rate.

6. The method of claim 1 wherein the geopolymer has a 20% expansion rate.

7. The method of claim 1 wherein the geopolymer comprises silicate.

8. The method of claim 1 wherein the geopolymer comprises fly ash.

9. The method of claim 1 wherein the slot disk has one slot.

10. The method of claim 9 wherein the slot is from about 200 micron to 5000 microns in width.

11. The method of claim 10 wherein the slot is from about 1000 microns to 5000 microns in width.

12. The method of claim 1 wherein the slot disk has three slots.

13. The method of claim 1 wherein the slot disk is 1 inch thick.

14. The method of claim 1 wherein the slot disk comprises an O-ring.

15. The method of claim 1 wherein the slot disk is ¼ inch thick.

16. The method of claim 1 wherein the temperature inside the test cell is about 80-90° C. for at least about 2 hours.

17. The method of claim 16 wherein the temperature is increased to about 180° C. and maintained for about 24 hours.

18. The method of claim 17 wherein as the temperature is increased, the geopolymer starts expanding and plugging the slot while solidifying.

Assignees

• Cnpc Usa Corp
• Cnps Usa Corp
• Beijing Huamei Inc
• China Nat Petroleum Corp

Inventors

• Zha Weibin
• Lu Meng
• Shipman Janine

Classifications

• C09K8/5045 Primary

  containing inorganic compounds · CPC title

• C04B28/006

  containing mineral polymers, e.g. geopolymers of the Davidovits type · CPC title

• C04B28/021

  Ash cements, e.g. fly ash cements (fly ash as filler C04B18/08); Cements based on incineration residues, e.g. alkali-activated slags from waste incineration (alkali-activated combustion residues as such C04B7/243; mixtures of the lime-pozzuolane type C04B28/18); Kiln dust cements · CPC title

• G01N15/082

  Investigating permeability by forcing a fluid through a sample · CPC title

• G01N15/0806 Primary

  Details, e.g. sample holders, mounting samples for testing · CPC title