Water solution, clean fracturing fluid and method for fracturing reservoir

Patent metadata

Field	Value
Publication number	US-10246630-B2
Application number	US-201715668273-A
Country	US
Kind code	B2
Filing date	Aug 3, 2017
Priority date	May 19, 2017
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

The present invention relates to the fracturing field, and discloses a water solution, a clean fracturing fluid, and a method for fracturing reservoir. The water solution contains organic acid amidopropyl dimethylamine, an additive, and water, wherein, the additive is at least one of salicylate, cis-butenedioic acid, o-phthalic acid, dodecyl sulfonate, p-toluene sulfonate, and benzoate. The water solution has high carbon dioxide response performance, a clean fracturing fluid that contains the water solution has superior cyclic utilization performance, and the fracturing fluid can solve the problems of conventional fracturing fluids used in fracturing stimulation of oil and gas reservoirs, including incomplete gel breaking, severe damages to the reservoir, and severe contamination of flow-back fluid, etc.

First claim

The invention claimed is:

1. A method for fracturing a reservoir, comprising:
preparing an aqueous solution by:
mixing an organic acid amidopropyl dimethylamine, an additive, and water, while stirring at a temperature of 30° C. to 50° C. for a time of 5 min to 20 min,
wherein the additive is selected from the group consisting of salicylate, cis-butenedioic acid, o-phthalic acid, dodecyl sulfonate, p-toluene sulfonate, benzoate and combinations thereof,
wherein a weight ratio of the organic acid amidopropyl dimethylamine and the additive is 8:1-12:1;

introducing carbon dioxide at a rate of 0.1-0.5 L/min. into the aqueous solution for gelatinization, to form a clean fracturing fluid,
wherein the carbon dioxide is introduced for a time sufficient render the clean fracturing fluid clear;
injecting the clean fracturing fluid into a reservoir for fracturing; and
introducing air, nitrogen, or an inert gas into the reservoir after the fracturing for gel breaking.

2. The method for fracturing a reservoir of claim 1 , wherein the organic acid amidopropyl dimethylamine is selected from the group consisting of palmitamidopropyl dimethylamine, stearamidopropyl dimethylamine, oleamidopropyl dimethylamine, erucamidopropyl dimethylamine, behenamidopropyl dimethylamine, and combinations thereof.

3. The method for fracturing a reservoir of claim 1 , wherein, based on the total weight of the aqueous solution, the amount of the organic acid amidopropyl dimethylamine is 1-6 wt %, the amount of the additive is 0.1-0.6 wt %, and the amount of water is 93.4-98.9 wt %.

4. The method for fracturing a reservoir of claim 1 , wherein a weight ratio of the organic acid amidopropyl dimethylamine and the additive is 9.5:1-10.5:1.

5. The method for fracturing a reservoir of claim 1 , wherein, when the reservoir temperature is lower than 50° C., the aqueous solution contains 1-2 wt % organic acid amidopropyl dimethylamine; when the reservoir temperature is 50-80° C., the aqueous solution contains 2-4 wt % organic acid amidopropyl dimethylamine; when the reservoir temperature is 80-95° C., the aqueous solution contains 4-6 wt % organic acid amidopropyl dimethylamine.

6. The method of claim 1 , wherein the additive is selected from the group consisting of salicylate, cis-butenedioic acid, dodecyl sulfonate, p-toluene sulfonate, benzoate, and combinations thereof.

7. A method of preparing an aqueous solution for use in fracturing a reservoir, the method comprising:
mixing an organic acid amidopropyl dimethylamine, an additive, and water, while stirring at a temperature of 30° C. to 50° C. for a time of 5 min to 20 min;
wherein, the additive is selected from the group consisting of salicylate, cis-butenedioic acid, o-phthalic acid, dodecyl sulfonate, p-toluene sulfonate, benzoate and combinations thereof;
wherein a weight ratio of the organic acid amidopropyl dimethylamine and the additive is 8:1-12:1.

8. The method of claim 7 , wherein the organic acid amidopropyl dimethylamine is selected from the group consisting of palmitamidopropyl dimethylamine, stearamidopropyl dimethylamine, oleamidopropyl dimethylamine, erucamidopropyl dimethylamine, behenamidopropyl dimethylamine, and combinations thereof.

9. The method of claim 7 , wherein, based on the total weight of the aqueous solution, the content of the organic acid amidopropyl dimethylamine is 1-6 wt %, the content of the additive is 0.1-0.6 wt %, and the content of water is 93.4-98.9 wt %.

10. The aqueous solution of claim 7 , wherein a weight ratio of the organic acid amidopropyl dimethylamine and the additive is 9.5:1-10.5:1.

11. A method of preparing a clean fracturing fluid, comprising:
preparing an aqueous solution by:
mixing an organic acid amidopropyl dimethylamine, an additive, and water, while stirring at a temperature of 30° C. to 50° C. for a time of 5 min to 20 min,
wherein the additive is selected from the group consisting of salicylate, cis-butenedioic acid, o-phthalic acid, dodecyl sulfonate, p-toluene sulfonate, benzoate and combinations thereof,
wherein a weight ratio of the organic acid amidopropyl dimethylamine and the additive is 8:1-12:1;

introducing carbon dioxide at a rate of 0.1-0.5 L/min. into the aqueous solution for gelatinization, wherein the carbon dioxide is introduced for a time sufficient render the clean fracturing fluid clear.

12. The method of claim 11 , wherein the organic acid amidopropyl dimethylamine is selected from the group consisting of palmitamidopropyl dimethylamine, stearamidopropyl dimethylamine, oleamidopropyl dimethylamine, erucamidopropyl dimethylamine, behenamidopropyl dimethylamine, and combinations thereof.

13. The method of claim 11 , wherein, based on the total weight of the aqueous solution, the content of the organic acid amidopropyl dimethylamine is 1-6 wt %, the content of the additive is 0.1-0.6 wt %, and the content of water is 93.4-98.9 wt %.

14. The method of claim 11 , wherein a weight ratio of the organic acid amidopropyl dimethylamine and the additive is 9.5:1-10.5:1.

Assignees

• Univ China Petroleum East China
• Res Institute Of Petroleum Exploration & Development

Inventors

• Dai Caili
• Zhao Mingwei
• Liu He
• Wu Yining
• Zhao Guang
• Sun Yongpeng
• Wu Xuepeng

Classifications

• C07C309/04

  containing only one sulfo group · CPC title

• C07C57/13

  Dicarboxylic acids · CPC title

• C07C233/05

  having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms · CPC title

• C07C57/145

  Maleic acid · CPC title

• C09K2208/26

  Gel breakers other than bacteria or enzymes · CPC title