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A Innovative Process For Weakening High Chrome Steel For Downhole Oilfield Completions

IP.com Disclosure Number: IPCOM000169626D
Publication Date: 2008-Apr-24
Document File: 1 page(s) / 10K

Publishing Venue

The IP.com Prior Art Database

Abstract

The current industry trend has seen an increase in the use of high chrome steels for well bore lining (casing) for both its strength and corrosion resistance. Once the casing has been installed, further intervention sometime dictates that a hole (lateral window) be milled in to the casing. The strength of this material inhibits this process. It is being suggested that to assist the milling of the high chrome steels, they must first be weakened. To accomplish this, it is proposed that the high chrome steels are first selectively corroded. Selective or localized corrosion of the high chrome steel will be performed via an Electro Chemical Disposition (ECD) process. The basic ECD process involves an anode (an electrolytically more active donor material), a cathode (a more noble material that will receive the donor material), an aqueous electrolyte solution (to allow the transfer of ions from the more active donor material) and a power supply (to help facilitate the chemical reaction). For this process, a basic chrome/nickel ECD process will be employed, using the casing as the anode. The intended result is to deplete the casing of chromium/nickel by sufficient quantities to result in a weakening of the material.

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A innovative process for weakening high chrome steel for down hole oilfield completions

The current industry trend has seen an increase in the use of high chrome steels for well bore lining (casing) for both its strength and corrosion resistance. Once the casing has been installed, further intervention sometime dictates that a hole (lateral window) be milled in to the casing. The strength of this material inhibits this process. It is being suggested that to assist the milling of the high chrome steels, they must first be weakened. To accomplish this, it is proposed that the high chrome steels are first selectively corroded. Selective or localized corrosion of the high chrome steel will be performed via an Electro Chemical Disposition (ECD) process. The basic ECD process involves an anode (an electrolytically more active donor material), a cathode (a more noble material that will receive the donor material), an aqueous electrolyte solution (to allow the transfer of ions from the more active donor material) and a power supply (to help facilitate the chemical reaction). For this process, a basic chrome/nickel ECD process will be employed, using the casing as the anode. The intended result is to deplete the casing of chromium/nickel by sufficient quantities to result in a weakening of the material.

This is a process for weakening high chrome steel casing for down hole oilfield completions. This process will use the casing as t...