EP2781686A1 - Film de protection pour outil d'extraction - Google Patents

Film de protection pour outil d'extraction Download PDF

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Publication number
EP2781686A1
EP2781686A1 EP13160663.4A EP13160663A EP2781686A1 EP 2781686 A1 EP2781686 A1 EP 2781686A1 EP 13160663 A EP13160663 A EP 13160663A EP 2781686 A1 EP2781686 A1 EP 2781686A1
Authority
EP
European Patent Office
Prior art keywords
downhole tool
ptfe
polytetrafluoroethylene
protective film
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13160663.4A
Other languages
German (de)
English (en)
Inventor
Jørgen HALLUNDBAEK
Stig Sejr Larsen
Hans Plessing
Kim Johnsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welltec AS
Original Assignee
Welltec AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Welltec AS filed Critical Welltec AS
Priority to EP13160663.4A priority Critical patent/EP2781686A1/fr
Priority to PCT/EP2014/055731 priority patent/WO2014147236A1/fr
Publication of EP2781686A1 publication Critical patent/EP2781686A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells

Definitions

  • the present invention relates to a method for corrosion protection and protection against abrasive wear of a downhole tool. Furthermore, the invention relates to a heating device for heating a downhole tool according to the method, to the use of a protective film comprising polytetrafluoroethylene (PTFE) for covering an exterior surface of a downhole tool, and to a downhole tool comprising the protective film.
  • PTFE polytetrafluoroethylene
  • the changing pressure may reduce the ability of a coating or protective layer to adhere to the exterior of downhole tools, which may cause pieces of coating to detach from the tool downhole. This may be highly undesirable, as detached pieces of coating may cause valves, tools, etc. to malfunction.
  • the application of protective coatings poses serious challenges, as downhole tools are often used far from high-tech manufacturing facilities where tools may be dismantled and coatings may be applied, removed or repaired
  • two layers of polytetrafluoroethylene (PTFE)-containing paint may be applied to the exterior surface of the downhole tool.
  • PTFE polytetrafluoroethylene
  • the polytetrafluoroethylene (PTFE)-containing paint may be applied with a layer thickness of 2-30 ⁇ m, preferably 3-10 ⁇ m, more preferably 3-5 ⁇ m.
  • heating of the downhole tool may be done by arranging at least a section of the downhole tool inside a heating chamber of a heating device.
  • heating of the downhole tool may be done by successively heating one section of the downhole tool at a time inside the heating chamber of the heating device.
  • the polytetrafluoroethylene (PTFE)-containing paint may be applied by spraying, using a brush or dipping at least a part of the downhole tool into the paint.
  • the method may comprise the step of curing the polytetrafluoroethylene (PTFE)-containing paint at a temperature of 80°C -140°C for approximately 30-60 minutes.
  • PTFE polytetrafluoroethylene
  • the method may comprise the step of adding a hardener to the paint.
  • the method described above may further comprise the step of pre-treating the exterior surface of the downhole tool before applying or re-applying the polytetrafluoroethylene (PTFE)-containing paint to the downhole tool.
  • PTFE polytetrafluoroethylene
  • the exterior surface of the downhole tool may be pre-treated by phosphatising, anodising, anodic coating, pickling or sandblasting the exterior surface of the downhole tool.
  • the exterior surface of the downhole tool may be pre-treated by applying a primer.
  • the polytetrafluoroethylene (PTFE)-containing paint may comprise at least one surfactant for lowering the surface tension of the paint.
  • the surfactant may have a hydrophilic group and a hydrophobic group.
  • polytetrafluoroethylene (PTFE)-containing paint may be applied to an already existing layer of protective film to provide an additional layer of protective film.
  • the method described above may comprise the steps of curing each layer of polytetrafluoroethylene (PTFE)-containing paint to provide a layer of protective film before a next layer of polytetrafluoroethylene (PTFE)-containing paint is applied.
  • PTFE polytetrafluoroethylene
  • the method may further comprise the step of applying the polytetrafluoroethylene (PTFE)-containing paint on an already existing layer of protective film.
  • PTFE polytetrafluoroethylene
  • the method described above may further comprise the step of fully of partly removing an existing layer of protective film provided on the exterior surface of the downhole tool before repainting the downhole tool with the polytetrafluoroethylene (PTFE)-containing paint.
  • PTFE polytetrafluoroethylene
  • the polytetrafluoroethylene (PTFE)-containing paint may only be applied to part of the exterior surface of the downhole tool, resulting in a protective film covering from 74% to 95%.
  • the method described above may further comprise the steps of inserting the downhole tool into a well, removing the downhole tool from the well after a certain period of time, repeating one or more of the steps of applying the polytetrafluoroethylene (PTFE)-containing paint, heating the downhole tool to cure the paint, and pre-treating the exterior surface of the downhole tool, and inserting the downhole tool into the well once again to carry out the same or a different operation.
  • PTFE polytetrafluoroethylene
  • the above-mentioned steps may be repeated for any number of cycles.
  • the protective film comprising polytetrafluoroethylene may be a solid film lubricant comprising polytetrafluoroethylene (PTFE) or a solid film lubricant comprising polytetrafluoroethylene (PTFE) sold under the trade name Gleitmo SFL by Fuchs Lubritech.
  • the present invention furthermore relates to a heating device for heating a downhole tool according to the method described above, the heating device comprising:
  • a second side of the heating box is provided with a second opening, thereby defining a passage through the heating box configured for receiving a section of the downhole as well.
  • the present invention furthermore relates to the use of a protective film comprising polytetrafluoroethylene (PTFE) for covering an exterior surface of a downhole tool to prevent corrosion and/or protection against abrasive wear of the downhole tool.
  • PTFE polytetrafluoroethylene
  • the protective film comprising polytetrafluoroethylene may be a solid film lubricant comprising polytetrafluoroethylene (PTFE) sold under the trade name Gleitmo SFL by Fuchs Lubritech.
  • the protective film comprising polytetrafluoroethylene may be a solid film lubricant comprising polytetrafluoroethylene (PTFE).
  • the protective film comprising polytetrafluoroethylene may be a solid film lubricant comprising polytetrafluoroethylene (PTFE) sold under the trade name Gleitmo SFL by Fuchs Lubritech.
  • the protective film comprising polytetrafluoroethylene (PTFE) may be a high-molecular polymer film.
  • the protective film may have excellent adhesion capabilities, thereby providing a very strong adhesion to an exterior surface of the downhole tool.
  • the downhole tool described above may further comprise a protective film covering from 74% to 95%.
  • the polytetrafluoroethylene (PTFE)-containing paint may be applied with a layer thickness of 2-30 ⁇ m, preferably 3-10 ⁇ m, more preferably 3-5 ⁇ m.
  • the protective film may constitute a pattern comprising longitudinal or transversal sections or stripes of protective film.
  • the present invention relates to a downhole tool comprising a protective film as described above.
  • the protective film provided on the downhole tool may have excellent adhesion capabilities, thereby providing a very strong adhesion to an exterior surface of the downhole tool.
  • the protective film provided on the downhole tool may be a solid film lubricant comprising polytetrafluoroethylene (PTFE) sold under the trade name Gleitmo SFL by Fuchs Lubritech.
  • PTFE polytetrafluoroethylene
  • the polytetrafluoroethylene (PTFE)-containing paint may be applied in at least two layers each having a thickness of 2-30 ⁇ m, preferably 3-10 ⁇ m, more preferably 3-5 ⁇ m.
  • the polytetrafluoroethylene (PTFE)-containing paint may contain a hardener.
  • the polytetrafluoroethylene (PTFE)-containing paint may contain 1-5 % by weight hardener, preferably 2-3 % by weight hardener.
  • the temperature at which the paint hardens can be lowered so that the paint is cured at approximately 80°C-100°C for approximately 30-60 minutes, preferably at approximately 80°C-90°C for approximately 30-60 minutes.
  • the amount of hardener in the paint is 1-5 % by weight, preferably 2-3 % by weight.
  • the polytetrafluoroethylene (PTFE)-containing paint may comprise at least one surfactant for lowering the surface tension of the paint.
  • the surfactant may have a hydrophilic and a hydrophobic group.
  • Fig. 1 shows a downhole tool 1 in the form of a downhole tractor.
  • the downhole tool is provided with a protective film 13 comprising polytetrafluoroethylene (PTFE) for covering an exterior surface 11 of the downhole tool.
  • the protective film of polytetrafluoroethylene (PTFE) has excellent adhering properties and adheres very well to metal surfaces even when subjected a harsh downhole environments.
  • the protective film may be a solid film lubricant comprising polytetrafluoroethylene (PTFE), such as a solid film lubricant sold under the trade name Gleitmo SFL by Fuchs Lubritech.
  • the protective film 13 is applied to the external surface 11 of the downhole tool 1 to prevent corrosion of the downhole tool to protect the tool from abrasive wear when particles pass in the well fluid and increase the resistance of the downhole tool towards well fluids, such as acids, solvents, mineral oils, synthetic oils and sea water.
  • well fluids such as acids, solvents, mineral oils, synthetic oils and sea water.
  • the protective film 13 is applied to the downhole tool 1 before the tool is inserted into a well.
  • the protective film may be applied any number of times, such as prior to each insertion of the downhole tool into a well.
  • the protective film is applied by applying a polytetrafluoroethylene (PTFE)-containing paint to an exterior surface 11 of the downhole tool, followed by the downhole tool 1 being heated to cure the paint, thereby providing the firmly adhering protective film 13 on the exterior surface of the downhole tool. Tests have shown that the protective film has very good adhesion capabilities and that the adhesion is very strong compared to known paints and coatings.
  • PTFE polytetrafluoroethylene
  • the exterior surface 11 of the downhole tool does not have to be cleaned from former layers of protective film since the paint is able to adhere to surfaces partly covered with former layers of the protective film.
  • the downhole tool may be thoroughly cleaned, e.g. degreased, to remove substances and impurities reducing the adhering capabilities of the protective film.
  • the exterior surface 11 of the downhole tool may also be pre-treated by phosphatising, anodising, anodic coating, pickling or sandblasting before the paint is applied.
  • an existing protective layer may be partly or fully removed before the downhole tool is repainted with the polytetrafluoroethylene (PTFE)-containing paint.
  • PTFE polytetrafluoroethylene
  • the paint may be applied by spraying, using a brush, dipping the downhole tool into the paint or by any other method know by the skilled person.
  • the inhibiting effect of the protective film may be exploited by painting the exterior surface of the downhole tool so that the resulting protective film 13 covers from 50% to 95%, preferably 74% to 95% of the exterior surface of the downhole tool.
  • a considerable advantage of this way of applying the paint is that parts of the downhole tool particularly dependent on fine tolerances, such as joints, interfaces or screw holes, need not be painted and covered by protective film. Also, slots or other interfaces of fasteners, such as screws, need not be covered by paint, whereby the downhole tool may be easier to dismantle after use.
  • the exterior surface may be painted in a specific pattern, as shown in Figs. 3a and 3b .
  • the pattern may comprise longitudinal or transversal sections or stripes of protective film.
  • the downhole tool is heated to cure the paint by inserting the downhole tool into a heating device 2, as shown in Fig. 2 .
  • the heating device 2 comprises a heating box 21 defining a heating chamber 22 provided with a heating means 23 for heating the heating chamber.
  • a first side 31 and a second side 32 of the heating box are provided with openings 41, 42 defining a passage 24 through the heating box.
  • one section 12 of the downhole tool may be arranged inside the heating chamber 22 at a time, with the remainder of the downhole tool extending from the heating chamber through the openings in the sides of the heating box.
  • one section 12 of the downhole tool is successively heated inside the heating chamber 22 at a time.
  • the heating device may be very compact, making it easy to transport to and set up at e.g. an off shore installation.
  • the downhole tool may be heated using any kind of heat gun or other heating means known by the person skilled in the art.
  • the polytetrafluoroethylene (PTFE)-containing paint comprises a combination of solid polytetrafluoroethylene (PTFE) lubricants, organic binders and solvents.
  • the polytetrafluoroethylene (PTFE)-containing paint may further comprise at least one surfactant for lowering the surface tension of the paint.
  • the surfactant has a hydrophilic group and a hydrophobic group.
  • the paint forms a dry solid film lubricant 13 firmly adhering to the exterior surfaces 11 of the downhole tool 1.
  • the protective film is a high-molecular polymer (HMP) film. More specifically, the protective film is a heat-curing solid film lubricant comprising polytetrafluoroethylene (PTFE) as a constituent.
  • HMP high-molecular polymer
  • Such a polytetrafluoroethylene (PTFE) solid film lubricant is for example sold under the trade name Gleitmo SFL by Fuchs Lubritech.
  • the protective film forms a dry, firmly adhering lubricating film or solid film lubricant (SFL).
  • SFL solid film lubricant
  • the applied paint is cured at approximately 120°C-140°C for approximately 30-60 minutes, thus protecting the downhole tool 1 and enabling energy efficiency.
  • the layer thickness of the protective film is about 2-30 ⁇ m, preferably 3-10 ⁇ m, and the protective film is able to withstand high temperatures, such as up to 250°C.
  • the polytetrafluoroethylene (PTFE)-containing paint may be applied in a plurality of layers each having a thickness of 2-30 ⁇ m, preferably 3-10 ⁇ m, more preferably 3-5 ⁇ m.
  • the previous layer is cured by means of heat.
  • the protective layer is subjected to particles in the fluid sliding past the tool surface at a high velocity, and thus a tool without a protective layer is subjected to significant abrasive wear.
  • the temperature at which the paint hardens can be lowered so that the paint is cured at approximately 80°C-100°C for approximately 30-60 minutes, preferably at approximately 80°C-90°C for approximately 30-60 minutes.
  • the amount of hardener in the paint is 1-5 % by weight, preferably 2-3 % by weight.
  • PTFE polytetrafluoroethylene
  • Prior known paints and coatings do not have the ability to adhere so well to the exterior surface of a downhole tool, especially after the downhole tool has been subjected to the harsh environment downhole.
  • prior known paints and coatings can easily be scratched off after the downhole tool has been submerged in an acid bath for testing, whereas the protective film according to the invention maintains its high adhesive strength.
  • the protective film thus has adhesion capabilities like no other known paint and coating previously known for use with downhole tools.
  • the tool Prior to inserting the downhole tool 1 into a well, the tool is de-greased using e.g. a solvent, and the polytetrafluoroethylene (PTFE)-containing paint is applied to one or more exterior surfaces 11 of the downhole tool. Subsequently, the paint is cured by heating the downhole tool using a heating device 2 according to the above.
  • the downhole tool 1 may be heated by successively heating one section 12 of the downhole tool at a time inside the heating chamber 22 of a heating device 2.
  • the process of applying the paint and subsequently heating the tool to cure the paint may be repeated any number of times deemed necessary by the skilled person. For example, a first layer of paint may be applied followed by the downhole tool being heated to cure the paint. Subsequently, a second layer of paint is applied on top of the cured protective film, followed by the downhole tool being heated once again to cure the second layer of paint.
  • the downhole tool After curing the downhole tool 1, the downhole tool may be inserted into an open hole or cased well to perform a desired operation. In the period of time during which the tool is in the well, the tool is protected from the harsh environment downhole by the protective film 13 due to the exceptional adhesion capabilities of the protective film.
  • the tool When the downhole tool has been retrieved from the well, the tool may be inspected to assess the condition of the protective film. If certain parts of the protective film have been damaged of worn, the protective film may be partly or fully removed.
  • the tool Before the downhole tool 1 is inserted into the well once again, the tool may be coated with an additional new layer of protective film 13.
  • the additional layer is applied on top of the already existing layer which has preferably been thoroughly cleaned to remove grease, oil residue, well fluids or other similar remains after the tool has been inserted in the well during the first run.
  • the application of the second layer on top of the already existing layer is possible because the proposed polytetrafluoroethylene (PTFE)-containing paint adheres remarkably better than known paints and coatings previously used for downhole tools..
  • PTFE polytetrafluoroethylene
  • the above process of coating the downhole tool with the protective film may very well be accomplished at the well site, e.g. at an off shore installation.
  • the protective film by fully or partly reapplying the protective film, optimal protection of the downhole tool during each run downhole may be ensured.
  • the downhole tool may be any kind of well tool or operational tool, such as a driving unit or downhole tractor, a stroking tool, a key tool, an anchoring tool, a setting tool, a cleaning tool, a milling tool, a packer tool, a dart, a self-propelling tool, a release tool, a logging tool, a casing collar locator or a scanning tool.
  • a driving unit or downhole tractor such as a stroking tool, a key tool, an anchoring tool, a setting tool, a cleaning tool, a milling tool, a packer tool, a dart, a self-propelling tool, a release tool, a logging tool, a casing collar locator or a scanning tool.
  • fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
  • gas is meant any kind of gas composition present in a well, completion, or open hole
  • oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
  • Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
  • a downhole tractor any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
  • a downhole tractor can be used to push the tool all the way into position in the well, in the event that the tool is not submergible all the way into the casing.
  • the downhole tractor may have projectable arms having wheels, wherein the wheels contact the inner surface of the casing for propelling the tractor and the tool forward in the casing.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Laminated Bodies (AREA)
  • Lubricants (AREA)
  • Paints Or Removers (AREA)
EP13160663.4A 2013-03-22 2013-03-22 Film de protection pour outil d'extraction Withdrawn EP2781686A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13160663.4A EP2781686A1 (fr) 2013-03-22 2013-03-22 Film de protection pour outil d'extraction
PCT/EP2014/055731 WO2014147236A1 (fr) 2013-03-22 2014-03-21 Film protecteur pour un outil de fond de trou

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13160663.4A EP2781686A1 (fr) 2013-03-22 2013-03-22 Film de protection pour outil d'extraction

Publications (1)

Publication Number Publication Date
EP2781686A1 true EP2781686A1 (fr) 2014-09-24

Family

ID=47901896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13160663.4A Withdrawn EP2781686A1 (fr) 2013-03-22 2013-03-22 Film de protection pour outil d'extraction

Country Status (2)

Country Link
EP (1) EP2781686A1 (fr)
WO (1) WO2014147236A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10711526B2 (en) * 2017-02-01 2020-07-14 Baker Hughes, A Ge Company, Llc Methods for forming or servicing a wellbore, and methods of coating surfaces of tools

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060108110A1 (en) * 2004-11-24 2006-05-25 Mckeen Laurence W Coated tools for use in oil well pipes
US20070051510A1 (en) * 2005-09-07 2007-03-08 Veneruso Anthony F Polymer protective coated polymeric components for oilfield applications

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060108110A1 (en) * 2004-11-24 2006-05-25 Mckeen Laurence W Coated tools for use in oil well pipes
US20070051510A1 (en) * 2005-09-07 2007-03-08 Veneruso Anthony F Polymer protective coated polymeric components for oilfield applications

Also Published As

Publication number Publication date
WO2014147236A1 (fr) 2014-09-25

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