Class 166/242.4 - Corrosion prevention or deterring

Subclass of Class 166 - Wells
Definition: Conduit wall structure comprising specific wall structure
No. of patents: 19
Last issue date: 09/02/2008

Number	Title	Issue Date
7419003	Erosion resistant aperture for a downhole valve or ported flow control tool An aperture design minimizes erosion on the surrounding casing and to the aperture itself and is particularly effective in fluid injection wells where large volumes of fluids over a long period of time with entrained solids are expected to be pumped through. The pre...	09/02/2008
7347259	Downhole oilfield erosion protection by using diamond A device for use with components for a downhole tool—such as a throat, a nozzle, or a diffuser—used for cleaning a wellbore, are disclosed which decreases the erosion of the components. The device may be comprised of a hardened material, such as stack of pure di...	03/25/2008
7189319	Axial current meter for in-situ continuous monitoring of corrosion and cathodic protection current First and second axial current meters (ACM) are mechanically connected to a well casing just above and below a corrosive zone and a master axial current meter (MACM) is connected to the casing at the earth's surface, the MACM periodically obtaining measurements of a...	03/13/2007
7178601	Methods of and apparatus for casing a borehole Methods of and apparatus for drilling, casing and/or completing a borehole wherein one or more portions of the borehole are drilled into a formation at a single diameter along the entire length or depth of the or each portion of the borehole. An expandable tubular m...	02/20/2007
7169480	Clad pipe A clad pipe includes an external layer and a coating layer made of Ni base anticorrosion alloy. Both end portion areas of the coating layer are formed by a build-up welded layer (Ni base alloy of composition 1) on the inner surface of the external layer. Othe...	01/30/2007
7096940	Centralizer system for insulated pipe A centralizer system is provided for use in a marine riser system with an insulated pipe, which may be a titanium stress joint. The centralizer system utilizes one or more centralizers mounted such that insulation material is provided in an annulus between the one o...	08/29/2006
6894008	Method of increasing pH of high-density brines It has been discovered that carbonate powders and bicarbonate powders are useful to increase the pH and corrosion resistance of high-density brines, such as zinc bromide brines, without significantly reducing their densities. The carbonates and/or bicarbonates shoul...	05/17/2005
6725925	Downhole cathodic protection cable system A downhole cathodic protection cable system includes an attachment shoe electrically connected to a metallic structure at a distance substantially below the earth's surface, and an electrical cable having a first end connected to a connection structure substantially...	04/27/2004
6672385	Combined liner and matrix system The invention relates to a system and a method for well completion, control and monitoring of processes in a reservoir. A combined prefabricated liner and matrix system (4) with defined properties for fast and simple well and/or reservoir completion, moni...	01/06/2004
6583091	Method for inhibiting corrosion using 4-sulfophthalic acid The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of 4-sulfophthalic acid, typically up ...	06/24/2003
6537950	Method for inhibiting corrosion using triphenylstibine The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of triphenylstibine, typically up to 1...	03/25/2003
6523615	Electropolishing method for oil field tubular goods and drill pipe A method of producing fluids from a well bore by polishing the inside diameter surface of a down-hole tubular. The method includes the steps of providing a down-hole tubular having an inside diameter and being made of a carbon steel alloy or a high chromi...	02/25/2003
6131659	Downhole well corrosion monitoring apparatus and method The existence and rate of corrosion in a section of a well tubing or well casing string is determined and monitored continuously or intermittently by installing at predetermined locations as the string is placed in the well bore, sections of pipe that hav...	10/17/2000
5236036	Device for delivering corrosion or deposition inhibiting agents into a well by means of an auxiliary delivery tube A new auxiliary injection tube concept is disclosed for injecting a fluid containing corrosion and/or deposit inhibiting agents into a well from the surface, without stopping working. The auxiliary injection tube includes a tube 10 conveying the injected ...	08/17/1993
5018575	Apparatus for reducing abrasion and corrosion in mandrels An insert for use in a mandrel used in the production string of a well utilizing a gas lift operation is disclosed. The tubing unit and the valve lug forming the mandrel have communicating bores into which the insert, which is formed of an abrasion resist...	05/28/1991
4773479	Corrosion guard tubing nipple A tubing string includes a series of tubing sections connected together by cuffs and extends from above the surface of the ground to an oil bearing formation in oil field service. To prevent corrosion of the string, each individual section of tubing has a...	09/27/1988
4688638	Downhole corrosion coupon holder A corrosion coupon anchoring system for positively positioning a corrosion monitoring coupon in the production flowpath downhole in a producing well. Preferably cylindrical coupons are held firmly within a cylindrical housing suspended out of contact with...	08/25/1987
4103748	Method for inhibiting the wear in a well casing A method for inhibiting the wear in a well casing is accomplished by determining the depths within a bore hole of a well where a drill string may contact the well casing. The casing is then run into the bore hole with one or more hardened wear sections po...	08/01/1978
4057108	Completing wells in deep reservoirs containing fluids that are hot and corrosive One string of corrosion resistant tubing and a casing string which has a corrosion resistant bottom section can be connected between a wellhead and a deep, hot reservoir so that a corrosive reservoir fluid can be produced while keeping it isolated from we...	11/08/1977

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Class 166/242.4 - Corrosion prevention or deterring