Combined treatment process for removing and inhibiting scale

Patent metadata

Field	Value
Publication number	US-12545827-B2
Application number	US-202017781215-A
Country	US
Kind code	B2
Filing date	Nov 19, 2020
Priority date	Nov 29, 2019
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

The present invention proposes a combined treatment of scale removal and inhibition in reservoir rock (inhibition squeeze), by using inhibitors derived from organophosphonic acid, in acidic medium, aiming at minimizing the intervention time in well scale mitigation operations, in addition to reducing costs per treatment and the risks associated with the process.

First claim

The invention claimed is:

1 . A method to remove and inhibit scale, the method comprising:
conditioning a producing well to receive an injection of a treatment fluid that acts in the dissolution of the scale; injecting and positioning of the treatment fluid in a reservoir through the producing well, the treatment fluid comprising amino bimethylene phosphonic acid; closing the producing well for around 24 hours to allow the interaction of the treatment fluid with reservoir rock exposed to the production well; opening and returning the producing well to production and collecting samples of produced aqueous fluid from the well; releasing scale inhibitor comprising amino bimethylene phosphonic acid previously retained in the reservoir rock from the treatment fluid into the well while the well is producing; chemically analyzing of the produced aqueous fluid; and testing the producing well to evaluate production conditions, inhibition, and treatment lifetime as a function of an inhibitor release curve.

2 . The method of claim 1 , wherein the treatment fluid and the scale inhibitor are the same type of fluid.

3 . The method of claim 1 , wherein the amino bimethylene phosphonic acid has a concentration of 10% v/v.

Assignees

• Petroleo Brasileiro S A —Petrobras
• Univ Federal Do Rio De Janeiro—Ufrj

Inventors

• Sampaio De Almeida Cardoso Giuseppe
• Ferreira Do Rosario Francisca
• Eustaquio Lopes Humberto
• Barbosa Melo De Carvalho Alexandre
• Batista Alvim Felipe
• Cajaiba Da Silva João Francisco
• Cavalcante Freitas Tiago

Classifications

• E21B37/06 Primary

  using chemical means for preventing or limiting {, e.g. eliminating,} the deposition of paraffins or like substances · CPC title

• C09K8/528 Primary

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• C09K8/52 Primary

  Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning · CPC title