Polymeric gels for oil and gas conformance control applications and methods of making same

Patent metadata

Field	Value
Publication number	US-11965128-B2
Application number	US-202017631335-A
Country	US
Kind code	B2
Filing date	Jul 29, 2020
Priority date	Jul 31, 2019
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A gel material for oil and gas conformance control operations is provided. The gel material includes a plurality of gel material components including polyacrylamide, triamine silica, and nanosilica which are added in suitable amounts to form the gel material under a gel formation condition. The present technology replaces and/or supplements conventional crosslinkers and provides enhanced polymeric gels, such as, for oil and gas field applications including wellbore strengthening, loss circulation materials, and water shut-off applications, at high temperatures. The present technology is compatible with fresh and high salinity water.

First claim

The invention claimed is:

1. A method of preventing or reducing loss circulation during drilling operations in an oil and gas well, the method comprising:
mixing a plurality of gel material components comprising polyacrylamide (PAM), triamine silica (TAS), and nanosilica (NS) at a surface temperature of an oil and gas well to form a mixture;
injecting the mixture through a tubing in the oil and gas well; and
allowing the mixture to form a gel material in the oil and gas well.

2. The method of claim 1 wherein a concentration of the polyacrylamide (PAM) is 9 wt. %.

3. The method of claim 1 further comprising providing to the mixture a chelating agent comprising at least one of diethylenetriamine pentaacetic acid (DTPA), hydroxy ethylethylenediaminetriacetic acid (HEDTA), or ethylene diamine tetra acetic acid (EDTA).

4. The method of claim 3 , wherein the chelating agent comprises ethylene diamine tetra acetic acid (EDTA) in a concentration of up to 1 wt. %.

5. A method of wellbore strengthening, LCMs, and/or water shut-off applications at high temperatures in oil and gas well drilling operations, the method comprising:
mixing a plurality of gel material components comprising polyacrylamide (PAM), triamine silica (TAS), and nanosilica (NS) at a surface temperature of an oil and gas well to form a mixture;
injecting the mixture through a tubing in the oil and gas well; and
allowing the mixture to form a gel material in the oil and gas well.

6. The method of claim 5 further comprising adding polyethyleneimine (PEI) to the mixture.

7. The method of claim 5 further comprising polyacrylamide tert-butyl (PAtBA).

8. The method of claim 5 , wherein a concentration of the polyacrylamide (PAM) is 9 wt. %.

9. The method of claim 5 further comprising providing to the mixture a chelating agent comprising at least one of diethylenetriamine pentaacetic acid (DTPA), hydroxy ethylethylenediaminetriacetic acid (HEDTA), or ethylene diamine tetra acetic acid (EDTA).

10. The method of claim 9 , wherein the chelating agent comprises ethylene diamine tetra acetic acid (EDTA) in a concentration of up to 1 wt. %.

Assignees

• Univ Qatar
• Qatar Found Education Science & Community Dev

Inventors

• Hamza Ahmed
• Hussein Ibnelwaleed Ali
• Shamlooh Mohamed
• Nasser Mustafa
• Magzoub Musaab
• Salehi Saeed

Classifications

• C09K8/035 Primary

  Organic additives · CPC title

• C08J3/11

  from solid polymers · CPC title

• E21B21/003

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• E21B33/138

  Plastering the borehole wall; Injecting into the formation · CPC title

• C08J2333/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title