EA024642B1 - Process for coating a threaded tubular component, threaded tubular component and resulting connection - Google Patents

Abstract

The invention concerns a threaded tubular component for drilling or working hydrocarbon wells, said tubular component having at one of its ends (1; 2) a threaded zone (3; 4) produced on its outer or inner peripheral surface depending on whether the threaded end is male or female in type, in which at least a portion of the end (1; 2) is coated with at least one lubricating dry film (12) comprising at least 65% by weight of a polyaryletherketone. The invention also concerns a process for depositing said film (12).

Description

The present invention relates to a tubular component used for drilling and operating hydrocarbon wells, and in particular to a threaded end of this component, said end having an external or internal thread and can be connected to the corresponding end of another component to form a connection.

In addition, the invention relates to a method for producing a jam-resistant film on this tubular component.

A component used for drilling and operating hydrocarbon wells is any element that is practically tubular in shape and designed to connect with another element of the same type or another, to ultimately form a pipe string for drilling a hydrocarbon well or riser designed to maintenance and repair (also known as risers for repair) or for use, such as risers, or for casing, or lift casing (tubing string), use used in the operation of wells. In addition, the invention may be applicable to components used in a drill string, such as drill pipes, drill collars, drill collars, and parts of pipe joints and drill collars known as tool joints or drill joints.

Each tubular component contains one end having an area with an external thread and / or one end having an area with an internal thread, each of which is designed to be screwed to the corresponding end of the other component, the resulting assembly forming a connection.

The threaded tubular components are connected under certain stresses to ensure that the tightening and sealing requirements of the operating conditions are met, even though it may be necessary to screw and unscrew the threaded tubular components several times in the well.

The conditions of use of these threaded tubular components give rise to different types of stresses, which necessitates the use of coatings on sensitive areas of these components, such as threaded zones, stops or sealing surfaces.

Make-up operations are usually carried out at high axial load, for example, under the weight of a pipe several meters long, connected by means of a threaded connection, possibly with a slight mismatch of the axis of the connected threaded elements, which causes risks of seizing in the threaded zones and metal-metal sealing surfaces. For this reason, threaded areas, stop surfaces and metal-metal sealing surfaces must be coated with greases.

In addition, threaded tubular components are stored (sometimes several years), then screwed up in an aggressive environment. Examples include saltwater spray drilling or onshore drilling when sand, dust or other contaminants are present. Thus, on surfaces that must interact when making up (threaded areas) or tight contact (metal-metal sealing surfaces), it is necessary to use coatings that resist corrosion. In addition, these surfaces must be treated against corrosion.

However, from an environmental point of view, it turns out that make-up greases that meet the requirements of the American Petroleum Institute (ΑΡΙ) PP5A3 standard do not provide a lasting solution, since these greases containing heavy metals can be displaced from the tubular components and released into the environment or into the well, leading to blockage, which necessitates cleaning operations. In addition, these greases do not provide adequate corrosion protection and must be applied locally during each make-up operation.

In order to solve the problems of ensuring long-term corrosion resistance and extreme pressure properties and comply with environmental prerogatives, the main actors in the field of threaded joints are actively developing continuous dry coatings (i.e., not viscous and not sticky, like greases), which are simultaneously lubricants and protect against corrosion, and which can be permanently applied to tubular components at the factory.

In particular, coatings are developed which are inert to the environment and resistant to wear.

The present invention is based on the discovery that the use of polyaryletherketones makes it possible to obtain lubricating dry films with high wear resistance, high anti-seize properties, high mechanical strength with a low coefficient of friction and which are resistant to extreme conditions of a hydrocarbon well. The solutions used can be adapted to various grades of metal for joints for the aforementioned tubular components.

The use of these polyaryletherketones and their properties in the context of threaded tubular components defined above are not described or proposed in the known technical solutions.

In particular, the present invention relates to a threaded tubular component for drilling or operating hydrocarbon wells, said tubular component having at one of its ends a threaded zone formed on its outer or inner surface, depending on whether the threaded end has an external or internal thread, which at least

- 1,024,642 a portion of the end is coated with at least one lubricating dry film containing at least 65 wt.% Polyaryletherketone.

Optional features that are optional or substitute are defined below.

Polyaryl ether ketone is selected from polyether ether ketone (PEEK), polyether ketone (PEC), and mixtures thereof.

Lubricating dry film has a structure with a degree of crystallinity in the range of 10-35%.

In addition, the dry lubricating film contains at least one Class 4 solid lubricant in ratios ranging from 10 to 35% by weight.

The lubricating dry film contains a perfluoroalkoxyethylene copolymer in proportions ranging from 10 to 30% by weight.

The dry lubricating film contains a mechanical reinforcing agent selected from the list of the following fillers: carbon black, mica, wollastonite, nanosized alumina, nanosized titanium oxide, glass powders, nanodiamonds, nanoscale \ νδ2 or ^ 82-fullerenes in ratios ranging from 1 to 15 weight .%.

The part coated with a lubricating dry film preliminarily passed the surface preparation stage selected from the group consisting of sandblasting, manganese phosphatapia, electrolytic coating of Cu or Cu-δη-Ζη alloys and projection deposited Fe and Ζη alloys.

The part coated with a lubricating dry film is pre-coated with a sub-layer of polyetheretherketone with a semi-crystalline structure and containing mica fillers.

Lubricating dry film covers the entire threaded area.

The threaded tubular component comprises a metal-metal seal surface, wherein said seal surface is coated with a lubricating dry film.

In addition, the present invention relates to a threaded pipe connection comprising a threaded tubular component with an external thread and a threaded tubular component with an internal thread, screwed one into another, in which at least one of said threaded tubular components is as defined above.

In addition, the present invention relates to a method for coating a threaded tubular component for drilling or operating hydrocarbon wells, said tubular component having a threaded zone at one of its ends formed on its outer or inner surface, depending on whether the threaded end is outer or inner thread, and the method includes the following steps, in which:

get a mixture containing polyaryletherketone powder in suspension in water in ratios ranging from 25 to 35 wt.%;

said mixture is applied to a portion of the end of said threaded tubular component;

part of the end thus coated is dried at a temperature of 100-150 ° C for

5-10 min;

part of the end, thus coated, is heated to a temperature of 350-450 ° C for 5-15 minutes at a rate of temperature increase of 10-20 ° C / min;

part of the end, thus coated, is cooled to ambient temperature with a cooling rate of less than 10 ° C./min to obtain a substantially crystalline structure.

Optional features that are optional or substitute are defined below.

In addition, the mixture contains a coalescing agent with a high evaporation rate with a boiling point in the range of 100-200 ° C and in ratios ranging from 2.5 to 10 wt.%

In addition, the mixture contains a nonionic wetting and dispersing agent in ratios ranging from 2.5 to 10 wt.%.

In addition, the mixture contains at least one Class 4 solid lubricant in ratios ranging from 3 to 12% by weight.

Class 4 solid lubricant is a perfluoroalkoxyethylene copolymer in ratios ranging from 3 to 12% by weight.

In addition, the mixture contains a mechanical reinforcing agent selected from the list of the following fillers: carbon black, mica, wollastonite, nanosized alumina, nanosized titanium oxide, glass powders, nanodiamonds, nanoscale \ νδ2 or ^ 82-fullerenes in ratios ranging from 0.5 up to 5 wt.%

Part of the end is coated using a pneumatic spray system, the diameter of the specified system being in the range of 0.7-1.8 mm and the air pressure in the range of 4-6 bar.

Before applying the mixture to a part of the end, a surface preparation step is carried out, selected from the group consisting of sandblasting, manganese phosphation, electrolytic coating with Cu or Cu-δη-Ζη alloys and particles of Pe and Ζη alloys applied by projection.

Before applying the mixture to a part of the end, a surface preparation step is performed, on which a sub-layer of polyetheretherketone with a semi-crystalline structure and containing mica fillers is filled.

In addition, the present invention relates to a method for coating a threaded tubular component for drilling or operating hydrocarbon wells, said tubular component having a threaded zone at one of its ends formed on its outer or inner surface, depending on whether the threaded end is outer or inner thread, and the method includes the following steps, in which:

part of the end of the specified threaded tubular component is heated to a temperature in the range of 360-420 ° C, preferably to a temperature close to 400 ° C;

powders of PEC and / or PEEK are applied to a part of the end of said threaded tubular component; part of the end thus coated is held at a temperature within

360-420 ° C, preferably at a temperature close to 400 ° C, for 1-4 minutes;

a portion of the end thus coated is cooled to ambient temperature with a cooling rate of less than 10 ° C./min to obtain a substantially crystalline structure.

Advantageously, before heating said part, a step is performed where said part is degreased.

Distinctive features and advantages of the invention are described in more detail in the following description, which is filed with reference to the accompanying drawings.

In FIG. 1 shows a schematic view of a joint obtained by joining two tubular components by screwing.

In FIG. 2 is a schematic view of a screw-in schedule for two threaded tubular components.

In FIG. 3 is a schematic view of a sublayer coated with a lubricating dry film.

In FIG. 4 is a schematic view of a test rig.

In FIG. 5 is a schematic view of another test rig.

In FIG. 6 and 7 are graphs of test results.

The threaded connection shown in FIG. 1 comprises a first tubular component with an axis of rotation 10 having an end 1 with an external thread, and a second tubular component with an axis of rotation 10 having an end 2 with an internal thread. Both ends, 1 and 2, each of which ends in an end surface oriented radially relative to the axis 10 of the threaded connection, respectively, have threaded zones 3 and 4, which interact to interconnect the two components by screwing. The threaded zones 3 and 4 can be with a trapezoidal, self-locking thread, etc. type. In addition, at the ends with external and internal threads, adjacent to the threaded zones 3, 4, metal-metal sealing surfaces 5, 6 are provided, respectively, intended to enter tightly sealed contact between each other after connecting two threaded components by screwing. Finally, the end 1 with the external thread ends at the end surface 7 abutting against the corresponding surface 8 provided at the end 2 with the internal thread when the two ends are screwed.

The applicant has envisaged other designs, in which the emphasis formed in this case by two contact surfaces 7 and 8 is replaced by a self-locking and protracted interaction of threaded zones 3, 4 (see documents I8 4822081, I8 PE 30467 and I8 KE 34467).

As can be seen in FIG. 1 and 3, at least one of the threaded tubular joints is coated on a part of its end 1, called the underlayer 11, with a lubricating dry film 12 containing at least 65 wt.% Polyaryletherketone, said lubricating dry film 12 having a crystallinity structure according to at least 10%. Recall that the degree of crystallinity is determined by the enthalpy of melting or crystallization (ΔΗ °) of the polymer. The theoretical melting enthalpy for a fully crystalline polyaryletherketone, in particular polyetheretherketone (PEEK), is 122 J / g according to Nau and Co11 (Poluteg Sottitsayoik, 1984, 25, 175-178). The presence of a crystallinity of at least 10% provides the advantage of excellent mechanical properties, in particular high torque on the stopper (torque on the stopper). However, in order to maintain film characteristics in terms of adhesion and protection in preparing the surface against corrosion, the degree of crystallinity is preferably maintained below 35%.

The polyaryl ether ketones used in the invention can be obtained from aqueous dispersions of polyether ether ketone or from aqueous dispersions of polyether ketone. These aqueous dispersions may contain organic or inorganic mechanical reinforcing agents, such as mica fillers such as muscovite and / or biotite, represented by aluminosilicate and hydrated potassium or magnesium, amorphous aluminas with a gamma-crystalline structure and particle sizes in the range of 20-300 nm, fillers from titanium dioxide with a particle size in the range of 10-100 nm, perfluoroalkoxyethylene copolymer resins (PFA), amorphous black carbon fillers, synthetic graphite powders with a diameter of less than 5 microns, nanoal ointment powders obtained by detonation and with a particle size in the range of 4-6 nm, type C glass with a fiber thickness in the range of 1-1.3 μm with a diameter of Ό90 <50 μm, nanomaterials \ ¥ 82 type fullerene with a particle size in the range 80 220 nm or lamellar fillers

- 3 024642 tungsten bisulfide \ U82 with a particle size of I50 = 55 nm.

Polyether ether ketones, the abbreviation of which is PEEK, and polyether ketones, the abbreviation of which is PEC, is obtained by the synthesis of nucleophilic substitution. Polyesterification results in rigid refractory polycrystalline polymers. They are included in the category of materials with the highest performance characteristics in the assortment of thermoplastic materials. They have a glass transition temperature of 143 ° C and, due to their semi-crystalline structure, retain their excellent mechanical properties at temperatures close to their melting point, which is 343 ° C. Their quasilinear and aromatic structure provides excellent long-term heat resistance of PEEK and PEC.

Molecular structure of polyetheretherketones:

Molecular structure of polyetherketones:

With a glass transition temperature of 157 ° C and a melting point of 374 ° C, polyether ketones (PEC) provide better performance at high temperatures compared to polyether ether ketones (PEEK), having all the same advantages such as stiffness, strength and chemical resistance.

The temperature of long-term operation is 240 ° C, and the deformation temperature under load for the reinforced grades PEEK and PEC exceeds 300 ° C in comparison with other polymers.

PEEK has high-level mechanical properties and retains its properties at temperatures up to 250 ° C for ultimate tensile strength and up to 300 ° C for ultimate flexural strength. These mechanical characteristics are significantly improved by adding 10-30% solid lubricants, such as graphite, carbon black, polymers such as fluorinated PTFE or resins such as perfluoroalkoxyethylene (PFA), or fiberglass.

Polyether ketones have almost three times higher wear resistance compared to polyether ether ketones at high temperatures and retain their mechanical and physical properties at temperatures more than 30 ° C higher than those for PEEK, allowing higher loads without permanent deformation.

Polyether ether ketones and polyether ketones have chemical resistance, in particular against saturated saline solutions, gaseous hydrogen sulfide at a temperature of 200 ° C, as well as hydrolysis resistance at a temperature of 200 ° C at a pressure of 1.6 MPa with heat resistance comparable to fluorinated polymers. Tab. 1 clearly shows the preferred mechanical properties of PEEK and PEC compared to fluorinated polymers (PTFE and PFA).

Table 1

The properties PEEK PEK PFEE PFA Melting point (° C) 343 372 327 310 Continuous Operation Temperature (° C) 260 280 260 260 Tensile strength (MPa) one hundred one hundred 14-35 28-31 Tensile modulus (GPa) 3,5 3,5 0.55 0.78 Bending Modulus (GPa) 4 4 0.45 0.67 Hardness (Shore ϋ) 085 Ώ85 050-055 ϋ60-64 Ultimate Compressive Strength (MPa) 118 118 - 12 Density 1.3 1.3 2.1-2.2 2.1-2.2

Various implementations are possible for polyether ketones and polyether ether ketones, but including fusion conversion at a temperature in the range of 370-420 ° C. The application can be carried out 4 024642 but by applying the powder in an electrostatic field, by spraying aqueous dispersions and by thermal application. In the molten state, polyetheretherketones and polyetherketones are not sensitive to corrosion, but they can be contaminated by injection molds made of alloys containing copper or chromium (as in some grades of martensitic stainless steels containing 13% chromium, for example), which will catalyze destruction and give coatings that are less resistant to oxidation. In general, after fusion conversion, the polyether ketones and polyether ether ketones adhere well to the metal, especially if it is not well polished. Allowed roughness is 2025% of the total required dry film thickness. Adhesion can be improved by using a sublayer as an adhesion promoter or by surface treatment by mechanical abrasion (sand or shot peening), etching in chromic acid or plasma treatment with an oxidizing agent, or a reducing agent of type O ₂ or even type ΝΗ ₃ . It should be remembered that the surface oxidation of almost all metals usually reduces the adhesion of the polymer. In order not to change the surface energy of the fastening, it is necessary to heat the metal in an inert atmosphere or by induction. Finally, cooling should be slow enough to result in good recrystallization and preserve the inherent properties of the polymer, such as wear resistance and scratch resistance. Rapid cooling would give an amorphous coating, which would still need to be recrystallized by annealing the parts at 200 ° C for 30 minutes. The mechanical properties of the polymer can be increased by increasing crystallinity by means of a controlled cooling method, for example, with a cooling rate of 10 ° C / min from 400 to 250 ° C followed by a constant temperature step of 30 min-1 h at a temperature of 250 ° C.

In a first step, the applicant investigated the preparation of a polyaryletherketone coating from an aqueous suspension of polyether etherketone sold by the company U1c1tech under the name U1co1e P800 series, which contains at least one solid lubricant, preferably a fluorinated polymer, such as perfluoroalkoxyethylene copolymer resin, to increase wear resistance and / or at least one an inorganic solid compound such as soot to increase abrasion resistance. Physico-chemical characteristics of various aqueous suspensions of the series Uyu1e P800 are evaluated in table. 2.

table 2

Physicochemical Characteristics \ tso1e P804 \ '| С01е Р805 \ 'ЧсО1е R807V1k Appearance White White Black liquid liquid liquid Solid particles (wt.%) 37 37 37 pH 6 5.5 5.5 180 6 mm viscosity (seconds) 55 55 thirty Particle Size (ϋ90 Diameter) 10 microns 10 microns 10 microns Melting point (° C) 343 343 343 Long temperature operation (° C) 260 260 260 Copolymer resin 10% solid thirty% solid perfluoroalkoxyethylene (PFA) particles particles Inorganic compound Soot

In addition, the applicant has accurately determined the composition of aqueous suspensions of polyetheretherketone powder. In particular, it has been found that aqueous suspensions may preferably contain 25-35 wt.% Polyether etherketone powder with a particle size of Ό90 10 μm sold by Uyueh under the trade name Uyue1e 704.

Aqueous suspensions may also contain solid lubricant particles from at least one of classes 1, 2, and 4, and preferably in ratios ranging from 3 to 12% by weight of solid lubricant from class 4 in the form of a fluorinated powder such as perfluoroalkoxyethylene copolymer sold by the company ΌΥΝΕΟΝ under the trade name Nuyoi® PPA with an average particle size of 5,024,642 rum particles in the range of 20-30 microns.

The term solid lubricant, as used in the present description, means a solid and stable body, which, when placed between two rubbing surfaces, can reduce the coefficient of friction and reduce wear and damage to these surfaces. These bodies can be divided into different categories, determined by their functional mechanism and their structure, namely:

class 1: solids whose lubricating properties are determined by their crystal structure, for example graphite, zinc oxide (ΖηΟ) or boron nitride (ΒΝ);

class 2: solids, the lubricating properties of which are determined by their crystal structure, as well as by the chemical reaction element in their composition, for example molybdenum disulfide Μοδ ₂ , graphite fluoride, tin sulfides, bismuth sulfides, tungsten disulfide or calcium fluoride;

class 3: solids, the lubricating properties of which are determined by their chemical reactivity, for example, some chemical compounds such as thiosulfate or EsFiS 88 ®, sold by EsFiS TechSiO1od1e8 1ps;

class 4: solids whose lubricating properties are due to plastic or viscoplastic behavior under the action of friction, such as polytetrafluoroethylene (PTFE) or polyamides.

Aqueous suspensions may contain mechanical reinforcing agents, preferably in ratios ranging from 0.5 to 1 wt.% Of carbon black fillers sold by Ewoshk under the trade name RpSheh with a specific surface according to the Brunauer, Emmett and Teller method in the range of 25-300 m ² / g and an average particle size in the range of 1-5 microns.

Aqueous suspensions may contain a coalescing agent, preferably with a high evaporation rate and a boiling point in the range of 100-200 ° C, such as ethylene glycol monobutyl ether, in ratios ranging from 2.5 to 10% by weight and more preferably in ratios ranging from 2.5 up to 5% by weight of the suspension in order to ensure coalescence or film formation by external plasticization of the polymer substances and change the surface tension of the suspension to facilitate spreading.

Aqueous suspensions may contain a surfactant and preferably a nonionic wetting and dispersing agent such as sodium dioctyl sulfosuccinate (a compound of sulfuric acid and an aliphatic ester in a mixture of water and ethyl alcohol) in proportions ranging from 2.5 to 10% by weight, preferably in ratios in the range of 2.5 to 5% by weight of the suspension in order to improve the wetting of the fastener and to prevent the precipitation of the powders from the solution.

Regarding the method of applying a dry film to a portion of the end 1, 2 of a threaded tubular component, the Applicant has determined that UYO1E 704 grade polyether etherketone powder can be applied by projection using an electrostatic powder spray gun using a dry or wet method.

In the first embodiment, before applying the PEEK powder, part of the end 1, 2 is preheated to a temperature of 400 ° C. Then, the coated part is kept at a temperature in the range of 360-420 ° C. for 2 minutes and preferably at an initial temperature of 400 ° C. to create a good surface appearance. This step may be repeated several times until the desired thickness is obtained. The powder must be dehydrated for at least 2 hours at a temperature of 180 ° C.

In the second embodiment, a part of the end 1, 2 is coated by pneumatic spraying of a cold aqueous suspension of Uk1e 704 powder, which may or may not be reinforced. For this method, part of the end 1, 2 should preferably be a perfectly clean and fat-free solvent, preferably a polar aprotic (not accepting and not giving away hydrogen ions) solvent, such as acetone.

Application can be performed using a pneumatic spray system with a gun with gravity feed and a bowl, and part of the end 1, 2 should be ambient temperature. The temperature of the mixture is preferably close to ambient temperature, wherein said ambient temperature is preferably within the range of 20-30 ° C.

The diameter of the spray gun is preferably in the range of 0.7-1.8 mm, and the minimum air pressure is 4 bar, preferably in the range of 4-6 bar.

The coated part is then left at ambient temperature for 5-10 minutes.

The specified part is then placed in an oven at a temperature of 120 ° C for 5-10 minutes. This drying step can be performed by induction (induction heating), for example. Then the part is placed in an oven either at a temperature of 400 ° C or at a lower temperature, followed by a temperature increase to 400 ° C at a rate of 10-20 ° C / min.

After reaching the maximum temperature of the metal, part of the threaded end 1, 2 is left at this temperature for 5-15 minutes, preferably at least 10 minutes, to allow the dry film to completely melt and form a homogeneous film.

Then part of the threaded end 1, 2 is removed from the furnace and allowed to cool to ambient temperature. The cooling rate should preferably be low, namely within the range of 1-200 ° C./min, in order to obtain a semi-crystalline structure.

- 6,024,642

An alternative to application in an electrostatic field is the application of Uyu1e powder by dry thermal application onto a part of the threaded end 1, 2 using a heat blower. In this method, part of the end 1, 2 should preferably be a perfectly clean and fat-free solvent, preferably a polar aprotic solvent, such as acetone.

The part is preheated in a furnace at a temperature of 260 ° C. Carrier powder is applied to the part with a carrier gas using a hot air blower. while the small particles of polyaryletherketone are heated to the melting point, accelerated and transferred to the substrate. After this stage, carry out rapid cooling in air to ambient temperature. This step may be repeated several times until the desired thickness is obtained.

The dry coating thickness is in the range of 20-70 microns, preferably in the range of 30-50 microns.

The tests consist in evaluating a number of parameters, namely:

frictional moment on contact surfaces at high contact stresses according to Hertz (Bridgman test);

adhesion forces of the film on the substrate (scratch test, cross-hatch test); resistance to wet environments; resistance to immersion in water;

wear resistance at high pressure (test on the Faleks machine).

The Bridgman test allows you to determine the tribological characteristics of dry film fillers during the make-up operation, specific to Premium compounds. In particular, they model and determine the torque on the stopper C8B, also known as ΤοδΡ (Yugschs op 8Yoy1 run gemMapsa). This point occurs during make-up operations specific to Premium compounds used in the oil industry and is shown in FIG. 2.

The curve in FIG. 2 shows the torque during make-up (or clamping) as a function of the number of turns made of rotation. As you can see, the make-up torque profile for Premium connections is divided into four parts.

In the first part P1, the outer turns of the threaded element (or drill joint nipple) with the external thread of the first component of the threaded tubular connection do not yet have a radial tightening with the inner turns of the corresponding threaded element (or drill joint) with the internal thread of the second component of the same threaded tubular connection.

In the second part P2, the geometrical engagement of the turns of the threaded elements with the external and internal threads creates a radial tightening that increases as the make-up continues (creating a small but increasing make-up torque).

In the third part P3, the sealing surface on the outer periphery of the end part of the threaded element with the external thread is radially engaged with the corresponding sealing surface of the threaded element with the internal thread, forming a metal-metal seal.

In the fourth part P4, the front end surface of the threaded element with an external thread abuts axially against the annular surface of the screwing stop of the threaded element with an internal thread. This fourth part of P4 corresponds to the final make-up phase.

The SAV make-up torque corresponding to the end of the third part P3 and the beginning of the fourth part P4 is called the locking docking torque.

The screwing torque of the CP corresponding to the end of the fourth part P4 is called the plasticizing torque of the CP. It is believed that the stop of the external thread during make-up (the end part of the element with the external thread) and / or the stop of the internal thread during make-up (the area located behind the annular thrust surface of the element with the internal thread) undergoes (or undergoes) plastic deformation, which can cause deterioration tightness of the contact between the sealing surfaces due to the plasticization of these sealing surfaces.

The difference between the values of the plasticizing torque of the CP and the locking torque of the SAW docking is called the torque at the stopper С8В (С8В = СР-САВ). At the end of make-up, the threaded tubular joint is subjected to optimal tightening, which serves as a guarantee of the optimum mechanical strength of the threaded joint, for example, in terms of tensile forces, as well as in part of accidental unscrewing during operation, and optimal sealing characteristics.

Thus, the developer of a threaded joint must determine for this type of threaded joint a value for the optimum tightening torque, which for all joints of this type of joint should be lower than the plasticizing torque of the CP (in order to avoid plasticization of the stops and the undesirable consequences that follow from this) and higher locking torque docking SAW. Final make-up with a torque less than CAB cannot guarantee the correct relative position of the elements with external and internal threads and, thus, an effective fit with an interference fit between their sealing surfaces. In addition, there is a risk of loosening. For the same type of connection, the actual value of the stopping torque of the SAW docking varies significantly from one connection to another, since it depends on the diametrical and axial tolerances for machining the external and internal threads and the seal surface (s); optimum make-up torque

- 7 024642 should be significantly higher than the locking torque of the connection of the SAW.

As a result, the higher the torque value on the C8B stopper, the greater the margin for determining the optimized make-up torque, and the more resistant the threaded connection to operating voltages will be.

Friction tests were carried out using a Bridgman type machine. This type of machine is described, in particular, in the article Ы Kyitai-Aykogog c1 a1, P1akys Γ1ον с Nusp Vpdtai apuPk ийιίβΐι rgekkigek, 1. Ma1eg. Kek., Νοί 6, io 12, EU 1991. A schematic and functional example of the Bridgman machine is shown in FIG. 5.

This machine contains: Er disk. which can be set in rotation with selected speeds; a first abutment end EC1, preferably of a conical type, permanently attached to the first side of the EO disk; a second abutting end EC2, preferably of a conical type, permanently attached to the second side of the EO disk opposite to its first side; first EP1 and second EP2 pressure elements, such as, for example, pistons, which can apply the selected axial pressure P; a third abutment end EC3, preferably of a cylindrical type, permanently attached to one side of the first pressure element EP1; a fourth stop end EC4, preferably of a cylindrical type, permanently attached to one side of the second pressure element EP2.

To test the composition of the lubricant, two samples of the material identical to the material from which the threaded element is made are coated with the specified composition to obtain the first 81 and second 82 samples. Then, the first sample 81 is placed between the free sides of the first EC1 and the third EC3 of the resistant ends, and the second sample 82 - between the free sides of the second EC2 and the fourth EC3 of the resistant ends. Then, the EO disk is rotated at a selected rotation speed, while applying a selected axial pressure P (for example, of the order of 1 GPa) by each pressure element, the first EP1 and second EP2, and the make-up torque to which each sample is subjected 81, 82 is measured. In the Bridgman test axial pressure, speed and angle of rotation are chosen to simulate the Hertz pressure and the relative velocity of the stop surfaces at the end of make-up. Using this machine, you can set several different pairs of parameters (make-up torque, rotational speed) to apply the specified make-up torques to samples 81 and 82 and, thus, check whether samples 81 and 82 follow this make-up torque profile exactly, and in particular, whether they can reach the number of full revolutions before scoring, which is at least equal to the threshold value selected in relation to the make-up torques.

In the present case, the selected contact pressure was 1 GPa, and the rotation speed was 1 rpm. Test samples were made of stainless steel containing 13% chromium, machined, and then coated with various dry film compositions.

The scratch test shown schematically in FIG. 4, allows you to determine the adhesion force or adhesion of the film on the surface or prepared surface. This method, which consists in shifting and deforming a film with a spherical ball subjected to an increasing load, also makes it possible to determine two main tribological parameters, namely, the coefficient of friction and the critical load corresponding to the occurrence of film cohesion loss.

The experimental conditions include the use of a spherical indenter made of Inconel 718 alloy with a diameter of 5 mm and a metal sample made of carbon steel XC48, treated with zinc or manganese phosphate, or electrolytically coated with ί '.' Ιι-8η-Ζη alloys. The parameters were as follows: a load that increased from 10 to 310 N with a load increase rate of 15 N / s, or a load that increased from 250 to 750 N with a load increase rate of 25 N / s. The ball displacement velocity was 2 mm / s for 20 s (path length 40 mm). The measured coefficient of friction is considered low if it is in the range μ = 0.05 for a load of 10 N, and μ = 0.09 for a load of 310 N. For a load of 310 N, μ was measured equal to 0.07 on the surface of carbon steel. It should be noted that for testing for each type of coating, it is necessary to clearly establish the load and operating conditions.

The transverse hatching test consists in assessing the resistance of a single or multilayer coating to tearing off the substrate when applying transverse hatching to the coating with notches over the entire thickness of the coating to the specified substrate in accordance with the breakdown into six categories. Excellent adhesion of the coating to the substrate should correspond to class 0 according to the standard Ι8Ο 2409 (2007): perfectly smooth edges to the incisions, the absence of separated squares of transverse hatching. In order to take into account operating conditions, a transverse hatching test is carried out after being placed in a humid environment (35 ° C and a relative humidity of 90%). The characteristics of good moisture resistance are the absence of changes in appearance, the absence of blistering or blistering, the absence of corrosion, the absence of cracking, the absence of peeling in accordance with the по8Ι4628 classifications and the absence of loss of adhesion.

Corrosion resistance tests consist of a neutral salt spray test carried out in a climate test chamber under the following conditions: temperature 35 ° C

- 8 024642 with a saline solution of 50 g / l with a density in the range of 1.029-1.036 at a temperature of 25 ° C, with a pH in the range of 6.5-7.2 at a temperature of 25 ° C with an average flow rate of 1.5 ml / h.

Samples that were intact, without rust, should then, after exposure, comply with the EO class of standard Ι8Θ 9227. This method provides means of verifying that the comparative quality of the metal material with or without a corrosion-resistant coating (metal or organic coating on a metal material) is maintained.

Water resistance tests consist in conducting accelerated corrosion tests on samples in accordance with standard ΌΙΝ 50017, conducted in a chamber for climatic tests. This test, containing one cycle per day, consists in the precipitation of water vapor by condensation under the following conditions: temperature 35 ° C, relative humidity 90% for 8 hours, then the sample dries. After 7 cycles, the substrate protected by the coating is not rusted.

Excellent water resistance should comply with поδΘ 4628 classifications: no corrosion, no blistering or blistering, no cracking, no peeling of chromium or carbon steel, treated or not treated with zinc phosphate (applying phosphate 8-20 g / m ² ) or manganese or treated electrolytic coating with a three-component alloy Cu-δη-Ζη with an intermediate layer Νί.

The immersion test is much more difficult than the water resistance test according to standard ΌΙΝ 50017. It consists in testing the water resistance of coatings. It is taken from the standard of the American society for testing materials ΤΜδΤΜ Ό870-09, relating to industrial and automotive paints.

Submersion in water may cause deterioration in coating performance. To predict the life of a coating, it is important to know how it resists immersion in water. Destruction or damage during the test by immersion in water can be caused by a number of factors, in particular, defective coating, contamination of the substrate or insufficient surface preparation. Thus, this test is used to evaluate individual coatings or coating systems in general.

The test consists in the semi-immersion of the sample in demineralized water for 168 hours at a temperature of 40 ° C in an oven. Adhesion, blistering or blistering, rust or pitting observed visually indicate the sensitivity of the coating to water.

In the high pressure wear test (also called the Falex test), a rotating indenter is used, sandwiched between two U-shaped blocks, as shown in FIG. 6. The test on the Falex machine is used, in particular, at high speeds to assess antiwear properties and properties under extreme pressure of lubricating fluids in accordance with the standards ΑδΤΜ Ό2670 and ΑδΤΜ Ό3233, but also used at low speeds to evaluate solid lubricants according to method in accordance with standard ΤΜΌδΤΜΌ2625. The test on the Falex machine is adapted for threaded connections used in the operation of hydrocarbon wells, in that it uses a semi-closed contact geometry (to capture the third lubricating body);

pressure-speed range corresponding to that in the connections;

the ability to conduct unidirectional or alternating tests to simulate screwing and unscrewing operations.

Test conditions: load = 785 N;

indenter speed = 60 rpm;

average metal-metal contact pressure = 560 MPa;

indenter sliding speed = 20 mm / s.

The purpose of this test is to simulate and evaluate durability in terms of extreme pressure properties for various films without the need for evaluations on the compounds. This test means that the performance of various coatings can be compared with actual joint tests. The seizure criterion is determined according to the standard ΑδΤΜ Ό2625-94, relating to the measurement of the load capacity of a film of solid lubricant, and corresponds to a sharp increase in torque compared to the initial state of the order of 1130 N-mm or coefficient of friction of the order of 0.15 for a load of 785 N. Typically, scoring occurs when the applied load is reduced, regardless of materials and configuration.

The applicant evaluated the characteristics, especially tribological characteristics, of various films obtained using aqueous suspensions of polyetheretherketone, for comparison, including those observed with a thermosetting film such as fluoroethane or a visco-plastic film with a waxy thermoplastic matrix.

The fluoroethane film consists of an aqueous dispersion of fluoroethylene vinyl ether cured using an aliphatic polyisocyanate hardener.

The waxy thermoplastic matrix contains at least one polyethylene wax and mainly suprabasic calcium sulfonate, in which friction-modifying fillers are dispersed, as described in document UO 2008/139058.

- 9,024,642

At the first stage, the applicant evaluated the adhesion, friction coefficient, anticorrosion protection and characteristics when immersing aqueous suspensions of polyetheretherketone on various substrates that received specific surface preparation:

XC48 carbon steel with a surface after machining (XC48 AkM); stainless steel Ζ20ί'.Ί3 (13Сг);

XC48 carbon steel with zinc (ΡΙιΖη) or manganese (PbMn) phosphating; XC48 carbon steel with an electrolytic coating with Cu-δη-Ζη (TA) alloy.

In the table. 3, 4 and 5 summarize the results of adhesion obtained respectively for aqueous suspensions

Uyuo1s P804, U1so1s P805 and Uyuo1s P807B1k on samples that have undergone various surface preparation, when tested by scratching and testing with transverse hatching according to the standard ΙδΟ 2409.

It should be recalled here that the scratch test characterizes the adhesion force of a high-performance material, preferably thermoset or thermoplastic, as a function of increasing the applied load. The critical load, which determines the destruction on the mating surface and, thus, the adhesion force of the material, is higher if the material is resistant and adhesive. The minimum critical load of 310 N corresponds to the minimum adhesion for pressures that can reach 1.1 GPa, below which there is an increase in the amount of wear product in contact, and thus, extreme pressure properties are insufficient.

For a cross-hatched test in accordance with ΙδΘ 2409, which measures adhesion after damage to the material by scratching to the mating surface, a mark of 0 indicates excellent adhesion, and a mark of 5 indicates very poor adhesion.

Table 3

Adhesion characteristics Uyuo1s P804

Surface preparation HS48 AzM RMP TA Adhesion test scratching (Tc in N) 242 750 400 Adhesion, Ι8Ο 2409 0 0 0

Table 4

Adhesion characteristics U1co! E P805

Surface preparation HS48 AzM 13Sg RMP TA Adhesion test scratching (bc in H) 253 246 750 294 Adhesion, Ι8Ο 2409 0 0 0 0

Table 5

Adhesion characteristics U1co! E P807B1k

Surface preparation HS48 AzM 13Sg ΡΙιΖπ RMP TA Adhesion test scratching (bc in H) 750 254 fifty 750 188 Adhesion, Ι8Ο 2409 0 0 5 0 0

All tested films had insufficient adhesion forces, regardless of the surface preparation performed on carbon steels by phosphating with a kick, with the exception of carbon steels with manganese phosphating. In addition, the polyetheretherketone film had low compatibility with surface treatment such as zinc phosphating.

To explain these results, the applicant also evaluated the degree of roughness obtained without phosphating. Since the adhesion mechanism for the polyetheretherketone film is mainly physical due to mechanical jamming, substrate roughness is a determining factor.

At the same time, it is recommended to treat the substrate by sand bombardment in order to obtain Ka roughness (Ka is the arithmetic mean relative to the midline of the roughness amplitude) of 20 or 25% of the thickness of the required final film to ensure good film adhesion, i.e. the roughness of Ka within 4-6 microns minimum. The roughness was determined using

- 10,024,642 rugozimeters in accordance with the standard ΙδΟ 1997.

Table 6

Roughness of test specimens as a function of surface preparation

Surface preparation HS48 A $ M 13Sg ΡΙιΖη RMP TA Ka (μm) 0.9 ± 0.05 0.09 0.8 ± 0.05 1.6 ± 0.1 1 ± 0.2 Κζ (μm) 4.8 ± 0.2 0.9 ± 0.1 5.1 ± 0.3 11.1 ± 1.0 8 ± 1.4

As can be seen from the table. 6, the relatively high roughness obtained by manganese phosphating provides a better degree of adhesion. This table also shows that very weakly polar surface preparations, such as an electrolytic coating with a three-component Cu-δη-Ζη alloy, do not promote adhesion.

In light of these first results, the applicant chose only substrates with a naturally low resistance to corrosion to determine the corrosion resistance, thereby excluding martensitic stainless steel containing 13% chromium, for which the adhesion critical load for polyester films was more than 180 N.

The thickness of the films obtained by cold pneumatic spraying was in the range of 20-45 microns. The degree of rusting within Ke0 and Ke9 was determined in accordance with ΙδΙ 4528-3. The degree of blistering and separation within 2δ2 (low concentration of blisters and small sizes) and 5δ5 (common swelling and large sizes) was determined in accordance with ΙδΟ 4628-2. The results are summarized in table. 7 and 8.

Table 7

Corrosion resistance for various surface preparations with U1e1e P805

film, was generally insufficient except for the electrolytic coating with Cu-δη-Ζη alloy, despite low adhesion or a strong loss of cohesion of the film under voltage. In addition, these results show that the U1eO1e P807B1k polyester ether film containing an inorganic compound such as carbon black has a relatively better corrosion resistance compared to U1e1e P805 regardless of surface preparation. The absolute best result was obtained in the case of an electrolytic coating with only 5 corrosion spots (ulcers) after 1000 hours. It was observed that the addition of an electrically conductive reinforcing filler in the form of soot strengthened the corrosion protection mechanism due to its action as a sacrificial anode.

- 11,024,642

Finally, the applicant estimated the average friction coefficients of the film subjected to abrasion by means of a scratch test over a wide load range between 10 and 750 N. The results are summarized in table. nine.

Table 9

Average friction coefficients (scratch test)

Film νίοοίε P804 Hasoss P805 Uyu1e R807V1k Training surface HS48 ΑδΜ TA HS48 ΑδΜ TA HS48 ΑδΜ 13Sg RMP TA Middle coefficient 0.198 0.173 0,069 0,075 0,073 0,112 0.135 0.127 friction (ΙΟΙ UN)

The friction coefficients of polyetheretherketone films were lower than 0.135 regardless of surface preparation and reached 0.075 for an average contact pressure of 500 MPa for polyetheretherketone containing a fluorinated polymer such as perfluoroalkoxyethylene.

The first results show that single-layer polyetheretherketone films have sufficient lubricating properties and anticorrosion characteristics, which depend not only on the composition of the film, but also on the adhesion of the substrate.

Then, in a second step, the applicant developed a tool for improving the adhesion and anti-corrosion characteristics. The applicant wanted to replace sandblasting when it was not possible due to the geometry of the parts to be coated. First of all, the applicant conducted research without changing the composition of the studied industrial films. In fact, the addition of adhesion promoters or corrosion inhibiting fillers in an amount of more than 10% increases the DCF (concentration of fillers by volume) above the DCF, for which there is just enough binder to coat the powdered substances (fillers and fillers), and, as a result, porosity and loss of cohesion of a film obtained from commercially available aqueous suspensions.

Other alternatives are possible using the polyether ether ketone powder Uyu1e 704.

The applicant has investigated an increase in adhesion with a sublayer such as an adhesion promoter. Direct adhesion between materials is rare. Since direct adhesion is mainly, but not exclusively associated with Van der Waals interactions, it occurs with very smooth materials that are extremely pure (e.g., mica or silicon), brought into close contact, i.e. within distances on the atomic scale (nanometric). Thus, this is often not possible if the surfaces are rough, but, on the other hand, is fully suitable for films with low roughness.

Thus, the applicant mainly investigated a film compatible with the method for producing a polyether ether ketone film by melting at a temperature of 400 ° C.

Instead of zinc phosphation, the sublayer may be a coating with iron and zinc alloys sold under the trade name Easgogogde О by Oasgak, but the method of its preparation by mechanical application equivalent to sandblasting / shot blasting limits its use in hollow bodies having small diameters and short in height.

The sublayer is preferably filled polyaryletherketone. A solution containing 1p1sg aya mica fillers such as muscovite or biotite in ratios ranging from 25 to 50% by weight in an organic polyester ether binder is sold under the trade name Uyuoke P817 by the supplier company Uyuyekh.

The method of applying and melting the sublayer is identical to that described for the upper layer. The difference is that a high cooling rate is required to obtain a less crystalline structure, which has higher insulating properties in order to delay the occurrence of corrosion ulcers and reduce the passivation current density of the material.

The thickness of the sublayer can be 30-40 microns.

The anticorrosive and adhesive properties of the sublayer, evaluated using two methods with different cooling kinetics, are summarized in Table. 10 and 11, respectively.

- 12,024,642

Table 10

Corrosion resistance for different surface preparations with Ugso1e P817 sublayer

Exposure time

Training surface Kinetics cooling 24 hours 48 hours 250 hours 500 hours 750 hours 1000 hours 1500 hours XC48 a $ M 120 ° C / min Keo Keo Keo Keo Keo KeO + 282 bloating Ke0 / 1 + 282 bloating TA 120 ° C / min Keo Keo Keo Keo Keo KeO + 282 bloating Ke0 + department nie HS48 avM 400-260 ° C 15 min. at 260 ° C 260 ° C _T-env Keo Keo Keo Keo Keo KeO / 1 + 332 bloating KeO / 1 + 383 bloating TA 400-260 ° C 15 min. at 260 ° C 260 ° C _T-env Keo Keo Keo Keo Keo KeO / 1 + 332 bloating Ke0 / 1 + 383 bloating

Table 11

Adhesion characteristics and coefficient of friction for Ugso1e P817

Surface preparation HS48 AzM TA Adhesion, scratch test (bc, h) 350 344 Adhesion, Ι8Ο 2409 0 0 Average coefficient of friction (10-310 N) 0.164 0.160

The sublayer from U1co1e P817 possessed sufficient protective and adhesive, but insufficient lubricating properties. Lubricating properties were provided by the top layer of polyaryletherketone.

Anticorrosion, adhesion and friction characteristics of the double layer are summarized in table. 12 and 13. The total thickness of the film containing the sublayer and the upper layer (top coating) was in the range of 40-70 μm.

- 13,024,642

Table 12

Corrosion resistance for various two-layer surface preparations

Upper layer Sublayer Training surface 24 hours 48 hours 250 hours 500 hours 750 hours 1000 hours 1500 hours U1co1e R807V1k U1co1e P817 HS48 AzM Keo Keo Keo Keo Keo KeO + 282 bloating KeO / 1 + 282 bloating RMP Keo Keo Keo Keo Keo Keo Keo TA Her oh Her oh Her oh Her oh Her oh Her O + 252 bloating Her O + separated Ie BasgoGog ^ e Ζ HS48 anM Ke2 Ke4 - - - -

Table 13

Adhesion characteristics and coefficient of friction of a double layer

Upper layer Υίοοΐο P804 \ hso (e P805 Ear R807V1k Sublayer U1SO (e P817 GHasto Rogets Ζ Training surface HS48 azM TA HS48 azM HS48 azM RMP TA HS48 azM Adhesion, scratch test (bc _; H) 441 662 > 750 675 637 > 750 > 750 Adhesion, Ι5Ο 2409 0 0 0 0 0 0 0 Middle coefficient friction (10- 310H) 0.117 0.114 0,061 0,086 0,085 0,084 0.129

The coefficients of friction for an average contact pressure of 500 MPa were sufficiently low, especially for a film of Uyuo1s P807 B1k, for which μ = 0.085, regardless of surface preparation, and are comparable with the coefficients of friction for a fluoroethane and epoxy thermosetting film, and should allow obtaining the value of the locking torque Joining less than 70% of the optimum make-up torque.

In general, the coefficient of friction, adhesion and corrosion protection of the polyetheretherketone film are significantly improved, preferably by the polyetheretherketone lower layer filled with mica filler, and in particular, the upper polyetheretherketone upper layer containing at least one fluorinated polymer, which is plastically deformable under stress, and / or a mechanical reinforcing filler such as carbon black.

Finally, the applicant evaluated the tribological behavior of the film through a Bridgman test to determine the stopper torque value. The stopper torque value obtained for Uyu1s P807 B1k was 85% of the reference value of ΑΡΙ КР 5А3 lubricant on XC48 carbon steel and Ζ20Ρ13 stainless steel. However, the difficulty of preparing the samples associated with the method of producing the film, and the small diameter of the samples mean that this value cannot be considered an absolute standard. The crystal structure and many potential intermolecular interactions of the Van der Waals type in polyether ether ketone indicate strong cohesion of the material and high

- 14,024,642 ultimate shear strength and thus likely to a significantly higher torque value at the stopper.

At the same time, the applicant evaluated the extreme pressure properties of the film by testing on a Falex machine. The test configuration for the joint may contain a pair of U-shaped blocks with different surface preparations coated with a PEEK film in one or two layers, and an XC48 carbon steel indenter with a surface after machining or a Ζ20ί'.Ί3 stainless steel indenter. containing 13% chromium.

Test conditions using a load of 785 N correspond to the average pressure in the contact of 150 MPa, which is relatively close to the pressure in the contact recorded when screwing at the beginning of the stop on the threads and the supporting surface (100-300 MPa), and the value of the product of pressure and speed (RU ) = 11.2 MPa-m / s, which is close to forming a pattern of wear when cutting threads on the supporting sides of the threads with RU = 5 MPa m / s.

The applicant has studied the reinforced polyether ether ketones U1eo1e P805 and P807 B1k.

FIG. Figure 6 shows the very good durability of the U1co1e P817 / U1eo1e P807 B1k double-layer film compared to the waxy thermoplastic solution currently used in the compound, and despite surface treatment such as an electrolytic coating with a three-component alloy, considered anti-seize (see AO 2008/032872). Scoring, according to the definition of this term in the standard ΑδΤΜ Ό2625-94, was never obtained, although in the case of the waxy thermoplastic solution ΗΜδ3 it was obtained after 51 minutes. A relatively low and constant coefficient of friction μ = 0.08 characterized a very low abrasive wear.

In order to determine the limits of the extreme pressure properties of the film, below the applicant estimated the durability and coefficient of friction of the film using a Falex test at growing loads in the range 1335-4200 N. The sliding speed was 10 mm / s, unlike 20 mm / s earlier. The results are shown in FIG. 7.

These results show that scoring does not occur at average contact pressures of 350 MPa, and confirm the very high wear resistance of the proposed film. In addition, with increasing pressure, the friction coefficient decreased and was in the range of 0.056-0.078.

In order to confirm the extreme pressure properties and coefficient of friction observed in the laboratory when using the Falex machine test and scratching tests on samples, in particular from carbon steel with an electrolytic coating with Cu-δη-Ζη alloy, the applicant performed screwing-up on 7 '' 29 # L80 compounds UAM TOR ΗΤ, which are very sensitive to badass. The make-up torque was 29900 Nm.

End 2 with carbon steel internal thread was electrolytically coated, and end 1 with external thread was zinc phosphatapia coated and coated with UV curing acrylic resin as described in patent publication AO 2006/104251. A two-layer PEEK film was applied to the treated sleeve with a cooling rate of less than 5 ° C / min. The makeup results are summarized in table. 14.

Table 14

Comparison of the results of screwing 7 '' 29 # L80 UAM TOR ΗΤ - SA IE

Name product Number operations Screwing without bully First attitude locking torque docking compared to torque make-up moment Number of make-ups Locking torque docking moment <70% torque make-up moment \ lso1e R807 V1k 17 57% 10

The screwing results obtained confirm the remarkable extreme pressure properties of the polyetheretherketone film and, in particular, of the reinforced polyetheretherketone film.

- 15,024,642

Table 15

The results of screwing compound 7 '' 29 # b80 ΥΆΜ TOP ΗΕΡΕΤΘ

End with inner End with the outside Number of screwdrivers without carving carving bully Carbon steel + electrolytic coating with Cu-δη- alloy Ζη + double layer PEEK Carbon steel + zinc phosphate + UV curable acrylic resin 17

Thus, a lubricating film is proposed having very interesting anti-seize properties when applied to a surface of carbon steel or a surface of steel containing at least 13% chromium. In addition, it allows you to do without electrolytic coating with two-component (Cu-δη) or three-component (Cu-δη-Ζη) alloys.

Claims (21)

CLAIM 1. A threaded tubular component for drilling or operating hydrocarbon wells, said tubular component having, at one of its ends (1, 2), a threaded zone (3, 4) made on its outer or inner peripheral surface, depending on has a threaded end, an external or internal thread, at least a portion of the end (1, 2) is coated with at least one lubricating dry film (12) containing at least 65 wt.% polyaryletherketone, characterized in that the lubricating dry film (12) has a structure with c crystalline heat within 10-35%. 2. The threaded tubular component according to claim 1, characterized in that the polyaryletherketone is selected from polyether ether ketone (PEEK), polyether ketone (PEC) and mixtures thereof. 3. A threaded tubular component according to any one of the preceding paragraphs, characterized in that the dry lubricating film (12) also contains at least one Class 4 solid lubricant in ratios ranging from 10 to 35% by weight. 4. A threaded tubular component according to claim 3, characterized in that the dry lubricating film (12) contains a perfluoroalkoxyethylene copolymer in ratios ranging from 10 to 30% by weight. 5. A threaded tubular component according to any one of the preceding paragraphs, characterized in that the dry lubricating film (12) contains a mechanical reinforcing agent selected from the list of the following fillers: carbon black, mica, wollastonite, nanosized alumina, nanosized titanium oxide, glass powders, nanodiamonds , nanoscale νδ2 or \ У5> 2-fullerenes in ratios ranging from 1 to 15 wt.%. 6. A threaded tubular component according to any one of the preceding paragraphs, characterized in that the part coated with a lubricating dry film (12) has previously passed the surface preparation step selected from the group consisting of sandblasting, manganese phosphate coating, electrolytic coating with Cu or Cu alloys δη-Ζη and Fe and иη alloys deposited by projection. 7. A threaded tubular component according to any one of claims 1 to 5, characterized in that the part coated with a lubricating dry film (12) is preliminarily coated with a sub-layer of polyetheretherketone with a semi-crystalline structure and containing mica fillers. 8. A threaded tubular component according to any one of the preceding paragraphs, characterized in that the entire threaded zone (3, 4) is covered with a lubricating dry film (12). 9. A threaded tubular component according to any one of the preceding paragraphs, characterized in that it comprises a metal-metal seal surface, wherein said seal surface is coated with a lubricating dry film (12). 10. A threaded pipe connection comprising a threaded tubular component with an external thread and a threaded tubular component with an internal thread screwed into one another, characterized in that at least one of said threaded tubular components is according to one of the preceding paragraphs. 11. A method of coating a threaded tubular component for drilling or operating hydrocarbon wells, said tubular component having a threaded zone (3, 4) at one of its ends (1, 2) made on its outer or inner peripheral surface, depending on moreover, has a threaded end male or female thread, characterized in that it includes the following stages, which receive a mixture containing polyaryletherketone powder in suspension in water in ratios ranging from 25 to 35 wt.%; said mixture is applied to a portion of the end (1, 2) of said threaded tubular component; - 16 024642 part of the end (1, 2) with the coating thus applied is dried at a temperature of 100-150 ° C for 5-10 minutes; part of the end (1, 2) with the coating thus applied is heated to a temperature of 350-450 ° C for 5-15 minutes at a rate of temperature increase of 10-20 ° C / min; part of the end (1, 2) with the coating thus applied is cooled to ambient temperature with a cooling rate of less than 10 ° C / min to obtain an almost crystalline structure. 12. The method of coating a threaded tubular component according to claim 11, characterized in that the mixture also contains a coalescing agent with a high evaporation rate with a boiling point in the range of 100-200 ° C and in ratios ranging from 2.5 to 10 wt.%. 13. The method of coating a threaded tubular component according to claim 11 or 12, characterized in that the mixture also contains a nonionic wetting and dispersing agent in ratios ranging from 2.5 to 10 wt.%. 14. The method of coating a threaded tubular component according to any one of paragraphs.11-13, characterized in that the mixture also contains at least one solid class 4 lubricant in ratios ranging from 3 to 12 wt.%. 15. The method of coating a threaded tubular component according to 14, characterized in that the solid lubricant of class 4 is a perfluoroalkoxyethylene copolymer in ratios ranging from 3 to 12% by weight. 16. The method of coating a threaded tubular component according to 14, characterized in that the mixture also contains a mechanical reinforcing agent selected from the list of the following fillers: carbon black, mica, wollastonite, nanosized alumina, nanosized titanium oxide, glass powders, nanodiamonds, nanoscale νδ2 or \ Vδ2- (|) γ-lerenes in ratios ranging from 0.5 to 5% by weight. 17. The method of coating a threaded tubular component according to claim 11, characterized in that part of the end (1, 2) is coated using a pneumatic spraying system, the diameter of this system being in the range of 0.7-1.8 mm, and the air pressure within 4-6 bar. 18. The method of coating a threaded tubular component according to any one of claims 11-17, characterized in that before applying the mixture to a part of the end, a surface preparation step is carried out, selected from the group consisting of sandblasting, manganese phosphate coating, electrolytic coating with Cu or Cu alloys δη-Ζη and particles of Fe and Реη alloys deposited by projection. 19. A method of coating a threaded tubular component according to any one of claims 11-17, characterized in that before applying the mixture to a part of the end, a surface preparation step is performed, on which a polyether ether ketone sublayer with a semi-crystalline structure and containing mica fillers is made. 20. A method of coating a threaded tubular component for drilling or operating hydrocarbon wells, wherein said tubular component has at its one end (1, 2) a threaded zone (3, 4) made on its outer or inner peripheral surface, depending on has a threaded end male or female thread, characterized in that it includes the following stages, in which part of the end (1, 2) of the specified threaded tubular component is heated to a temperature in the range of 360-420 ° C, preferably to a temperature of izko to 400 ° C; powders of PEC and / or PEEK are applied to a part of the end (1, 2) of said threaded tubular component; part of the end (1, 2) with the coating thus applied is kept at a temperature in the range of 360-420 ° C, preferably at a temperature close to 400 ° C, for 1-4 minutes; part of the end (1, 2) with the coating thus applied is cooled to ambient temperature with a cooling rate of less than 10 ° C / min to obtain an almost crystalline structure. 21. The method of coating a threaded tubular component according to claim 20, characterized in that before heating the part to be coated, perform the stage at which the specified part is degreased.