IP Library Granted Patent US 11,795,381
Granted Patent B2
US 11,795,381 · App. 18/053,647 · Granted Oct 24, 2023

Using synthetic acid compositions as alternatives to conventional acids in the oil and gas industry

Inventors: Clay Purdy (Medicine Hat, CA); Alexander David Jamieson (Calgary, CA); Markus Weissenberger (Calgary, CA)
Assignee: DORF KETAL CHEMICALS FZE
C09K8/74C09K8/528C09K8/54C09K8/665C09K8/68C23F11/04C23G1/02C23G1/04C23G1/088E21B43/26C09K2208/32
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Quick Facts
Patent No.
US 11,795,381
App. No.
18/053,647
Granted
Oct 24, 2023
Kind
B2
Abstract

The invention includes a method of reducing a need to re-acidize a hydrocarbon-containing formation. The method comprises providing a composition a HCl and lysine mixture and water wherein a molar ratio between the HCl and the lysine mixture ranges between 3:1 and 12.5:1, and the composition has an initial pH of less than 1; injecting the composition into the formation; allowing a sufficient time for the composition to become a spent acid composition and to subsequently create wormholes in the formation by dissolving calcium carbonate in the formation; maintaining the dissolved calcium carbonate in suspension in the spent acid composition to prevent reprecipitation of the calcium carbonate into the wormholes; removing the spent acid composition containing the dissolved calcium carbonate from the formation; and wherein a pH of the spent acid composition ranges between 4 and 6.

Claims (7)

1. A method of reducing a need to re-acidize a hydrocarbon-containing formation, said method comprising:

providing a composition comprising a HCl and lysine mixture and water; wherein a molar ratio between the HCl and the lysine mixture ranges between 3:1 and 12.5:1, and said composition has an initial pH of less than 1;

injecting said composition downhole at a desired injection rate into said hydrocarbon-containing formation and injecting at a pressure below a fracking pressure of the hydrocarbon-containing formation;

allowing a sufficient period of time for the injected composition to contact said hydrocarbon-containing formation to become a spent acid composition and to subsequently create wormholes in said hydrocarbon-containing formation by dissolving calcium carbonate in said hydrocarbon-containing formation;

maintaining the dissolved calcium carbonate in suspension in the spent acid composition to prevent reprecipitation of the calcium carbonate into said wormholes;

removing the spent acid composition containing the dissolved calcium carbonate from said hydrocarbon-containing formation; and

wherein a pH of the spent acid composition ranges between 4 and 6.

Assignments (4)
SECURITY INTEREST Recorded Dec 12, 2023
From: DORF KETAL CHEMICALS FZE
To: HSBC BANK MIDDLE EAST LIMITED
Reel/Frame 065878/0104 →
CORRECTIVE ASSIGNMENT TO CORRECT THE PRIOR ERRONEOUS RECORDATION OF ASSIGNMENT APPLICATION NUMBERS: 15614284, 17148881 PREVIOUSLY RECORDED ON REEL 063118 FRAME 0689. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded May 17, 2023
From: FLUID ENERGY GROUP LTD.
To: DORF KETAL CHEMICALS FZE
Reel/Frame 063695/0522 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 20, 2023
From: FLUID ENERGY GROUP LTD.
To: DORF KETAL CHEMICALS FZE
Reel/Frame 063118/0689 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 6, 2022
From: PURDY, CLAY; WEISSENBERGER, MARKUS; JAMIESON, ALEXANDER DAVID
To: FLUID ENERGY GROUP LTD.
Reel/Frame 062000/0306 →
Priority Claims (1)
CA CA 2937490 · Jul 29, 2016 · national
Continuity (3)
Continuation 17145881 · Jan 11, 2021
Continuation 16316895
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