Tubular threaded member with dry protection coating
A threaded element, tubular technology, used in coatings, threaded connections, pipeline protection, etc., can solve problems such as inability to protect threaded elements from corrosion, inability to adequately protect threaded elements, and inability to solve particle grinding
Active Publication Date: 2010-05-26
VALLOUREC OIL & GAS FRANCE SAS +1
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- Description
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- Application Information
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Problems solved by technology
However, this semi-dry coating has the disadvantage of requiring mechanical protection against contamination by dust or sand particles during transport and storage
[0008]In addition, the above-mentioned coatings usually have to be heated in a furnace at about 200°C for tens of minutes or even more than an hour to cause hardening, which significantly increases the coating production cycle, and cannot coincide with the machining of the thread
[0009] Furthermore, they often do not protect threaded elements from corrosion, or do not sufficiently protect threaded elements, so US 6679526B2 and WO 2004 / 033951 propose to apply separate corrosion inhibiting materials (metal salts of carboxylic acids in the first document, pp. In the second literature, the epoxy resin layer containing zinc particles
[0010] This two-layer coating has to go through a more cumbersome production cycle and still doesn't solve the problem of particle removal
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0152] A VAM TOP HC type threaded joint made of low alloy steel (grade L80) with a nominal diameter of 177.8 mm (7 inches) and a mass per unit length according to the specifications compiled by the OCTG department of Vallourec & Mannesmann Tubes was used in the examples It is 43.15kg / m (29lb / ft).
[0153] Phosphate the male threaded elements with zinc before applying the coating (the weight of the layer is 4-20g / m 2 ), and the female threaded element is phosphated with manganese (the weight of the layer is 8-20g / m 2 ). The threaded element was preheated at 130° C. and applied to it using thermal spraying a 35 μm thick layer of the product, kept in the molten state at 150° C., having a weight by weight in one of the examples I to VI composed of:
[0154] - Polyethylene is a commodity sold by CLARIANT under the name PE 520,
[0155] - carnauba wax is an item sold by NOVEON under the name LANCO 1955SF,
[0156] - Zinc stearate is a commodity sold by PETER GREVEN under the na...
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Abstract
The coating of the invention includes a solid matrix adhering to the substrate and in which are dispersed particles (11) of at least one solid lubricant that belongs to the same one class. The solid matrix is lubricating and has a rheologic behaviour of the plastic or viscoplastic type. The invention can be used for protecting the threads of threaded members used in hydrocarbon wells against corrosion and seizure.
Description
technical field [0001] The invention relates to threaded elements for tubular threaded joints. Background technique [0002] Threaded elements used in hydrocarbon wells that are placed at the end of a tubular assembly (pipe or coupling) must first be protected from corrosion during transport and wellsite storage, so they are traditionally coated with protective coatings when they leave the fabrication shop oil or grease. [0003] In a well, they may have to go through several make-up and break-out cycles. The make-up operation is carried out vertically under high axial loads, for example under the weight of a pipe several meters long (typically 10 to 13 meters long) to be assembled vertically by a threaded joint, which leads to galling , especially the risk of thread gluing. Since the pipe to be assembled hangs vertically, this load can also be localized by slight misalignment of the axis of the threaded element to be assembled, which increases the risk of galling. thus,...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F16L15/00F16L58/18
CPCC10M2205/022C10M2213/062C10M169/044C10N2250/141C10M2219/044F16L58/182C23C4/124C10M2209/084C10M2215/066C10M2229/02C10M2217/044C10N2250/14C10M2201/061C10N2240/06F16L58/04C23C4/02C10N2230/12C10M2201/066E21B17/042C23C22/76F16L15/001C10M2205/14C10N2250/10C10N2230/06C10N2220/082C10M2223/04C10M2207/026C10M2201/065C23C4/129C10N2020/06C10N2030/06C10N2030/12C10N2040/06C10N2050/023C10N2050/025C10N2050/10C10N2010/04
Inventor L·博尔代L·吉洛E·皮内尔E·加尔
Owner VALLOUREC OIL & GAS FRANCE SAS