Stuck-ball method to delineate gelation time

Patent metadata

Field	Value
Publication number	US-11408809-B2
Application number	US-202017076251-A
Country	US
Kind code	B2
Filing date	Oct 21, 2020
Priority date	Oct 21, 2020
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

Methods for determining the gelation period of a gel solution are provided. The methods provided include introducing an inert ball into each of a plurality of gel solution containers having a gel solution therein. In the method, the inert balls are then allowed to sink to the bottom of the containers, followed by a step of repeatedly inverting a first gel solution container at specified time intervals until the onset of gelation of the first gel solution is observed. Methods further include repeatedly inverting an additional gel solution container at specified intervals where each of the subsequent gel solution containers containing the inert balls and gel solutions are sequentially inverted in series until the inert ball is observed to remain fixed in place in the solution.

First claim

What is claimed:

1. A method for determining the gelation period of a gel solution comprising:
introducing an inert ball into each of a plurality of gel solution containers having a gel solution therein;
allowing the inert ball to sink to the bottom of the containers;
repeatedly inverting a first gel solution container at specified time intervals; and
once start of gelation of the first gel solution is observed, repeatedly inverting an additional gel solution container at specified intervals;
wherein subsequent gel solution containers containing the inert balls and gel solutions are sequentially inverted in series until the inert ball is observed to remain fixed in place in the solution.

2. The method of claim 1 , where the specified time intervals become shorter in a final 15% of the estimated gelation period.

3. The method of claim 1 , wherein the gel solution containers are inverted at about 180 degrees, relative their original position.

4. The method of claim 1 , wherein the gel solutions are inverted for a time period ranging from 1 minute (min) to 30 mins.

5. The method of claim 1 , wherein the number of replicate gel solution ranges from 3 to 10.

6. The method of claim 1 , wherein the ball has a radius ranging from 0.4 to 1.5 millimeters (mm).

7. The method of claim 1 , wherein the ball is comprised of a material selected from the group consisting of steel, silica, carbon, stainless steels, refractory metals, certain ceramic, or a combination thereof.

8. The method of claim 1 , wherein each inert ball has the same density and radius, and is prepared from the same material.

9. The method of claim 1 , wherein the inert ball has a density that is less than 10% greater than the density of the gel solution, prior to gelation.

10. The method of claim 1 , wherein the gel solution containers are placed in an oven to control the temperature of the gelation polymerization.

11. The method of claim 10 , wherein the gelation polymerization is conducted at a temperature that is less than 100° C.

12. A method for determining the gelation period of a gel solution comprising:
introducing an inert ball into each of a plurality of gel solution containers having a gel solution therein;
allowing the inert ball to sink to the bottom of the containers;
repeatedly inverting a first gel solution container at specified time intervals; and
once start of gelation of the first gel solution is observed, repeatedly inverting an additional gel solution container at specified intervals, wherein the specified time intervals become shorter for each subsequent gel solution;
wherein subsequent gel solution containers containing the inert balls and gel solutions are sequentially inverted in series until the inert ball is observed to remain fixed in place in the solution.

13. The method of claim 12 , wherein the gel solutions are inverted for a time period ranging from 1 minute (min) to 30 mins.

14. The method of claim 12 , wherein the number of replicate gel solution ranges from 3 to 10.

15. The method of claim 12 , wherein the ball has a radius ranging from 0.4 to 1.5 millimeters (mm).

16. The method of claim 12 , wherein the ball is comprised of a material selected from the group consisting of steel, silica, carbon, stainless steels, refractory metals, certain ceramic, or a combination thereof.

17. The method of claim 12 , wherein each inert ball has the same density and radius, and is prepared from the same material.

18. The method of claim 12 , wherein the gelation time is determined for the specific gel solution and the time is collected and stored in a database.

Assignees

• Saudi Arabian Oil Co

Inventors

• Fahmi Mohanad M
• Alsofi Abdulkareem M

Classifications

• G01N11/12 Primary

  by measuring rising or falling speed of the body; by measuring penetration of wedged gauges (G01N11/16 takes precedence) · CPC title

• C08F120/56

  Acrylamide; Methacrylamide · CPC title