Method of gluing protective polyurethane coating to metallic surface

FIELD: protective coatings.

SUBSTANCE: invention relates to methods for protecting metallic surfaces of geophysical instruments for exploring wells against combined action of generated acoustic field, drilling mud components, and formation fluids causing rapid wear of well instrument body. Gluing of protective polyurethane coating to cleaned and degreased metallic surface is effected by a way wherein glue composition based on triphenylmethanetriisocyanate in organic solvent is preliminarily applied onto surface as a layer with thickness 0.5-5 μm, preferably 1-3 μm, after which applied film is aged for 15-30 min at 100°C or for 12-18 h at 20-25°C and relative air humidity 30 to 98% and then protective coating based on lacquer polyurethane and/or poured polyurethane composition is deposited and hardened by a known method.

EFFECT: improved quality of received acoustic signal.

4 cl, 1 tbl, 3 ex

 

The invention relates to a method of bonding the protective coatings based on polyurethane with a metal surface, especially of the instrument housing for GIW, to protect the process equipment from the effects of aggressive factors, and can be applied in other industries.

The main negative factors affecting the quality of geophysical research, are physico-chemical effects of the components of the drilling mud and fluids on the body of the downhole tool, leading to rapid deterioration, as well as the influence of physical parameters of the solution and protective coatings that impede the conduction of the measurements in the well.

Polyurethanes are characterized by high durability, resistance to weather and ozone resistance, high physical and mechanical properties, and therefore the problem of their attachment to metals is of considerable interest.

There is a method of mounting castable polyurethane to metal with the use of adhesives based on the solutions of resins vinylacetylene patterns [1. The Khrulev V.M. Synthetic adhesives and mastics. M.: Higher school. 1970. s].

However, the bond strength of the resistance to detachment of castable polyurethanes in this way is small. There is a method of bonding castable polyurethanes with metals [2. Copyright certificate FROM THE CF No. 539934, MCI 09 J 5/00; 3/16, 1975. Amedvedeva; USERENV; Lignostone; Gin; Acceptanoe, Laiosa and Aaall] by applying to the surface the last glue-based solution in an organic solvent fosforsoderzhashchie vinylethylene resin and co-curing polyurethane composition.

This method provides high bond strength and hydrolytic resistance, but the level of elasticity in the area of contact is reduced due to cyclic deformation loads obtained polyurethane coating is destroyed.

The closest in technical essence of the present invention is a method of bonding a polyurethane coating to a metal surface by pre-lamination on the surface of the adhesive compositions in the form of a solution in an organic solvent mixture of complex polyester, diisocyanate and catalyst and followed by solidification [3. USSR author's certificate No. 994528, 09 D 5/00, 09 J 3/16, 1983. Magunov, Geatano and others].

However, given the prototype method for bonding castable polyurethanes provided quality mounts polyurethane linings of large rolls of paper-making machines, but does not provide an acceptable resource actions protective polyurethane coating IU aricescu surface downhole tools geophysical exploration (PL. position 1-8).

An object of the invention is to increase resource protection actions polyurethane coatings for complex mechanical loadings, fluids, particles of drilled formations and reagents drilling mud.

The technical result is achieved by the fact that the bonding of the protective polyurethane coating to clean and degrease metal surface pre-applied adhesive composition composition, parts:

triphenyltetrazolium18,0-30,0
organic solvent
(dichloromethane or ethyl acetate)70-82

thickness of 0.5-5 μm, preferably 1-3 μm, which is aged 15-30 min at 100°or 12-18 h at 20-25°C at a relative humidity of 30-98%, and then apply a protective coating of lacquer and(or) castable polyurethane composition composition [PL. position 9-16]. Varnish polyurethane composition, representing a solution of MDI, based on the polyether and an excess of diisocyanate in an organic solvent, is applied in layers on the metal surface to form a protective coating thickness 30-250 μm, preferably 60-200 μm, by any known method in which the temperature -10 - +30°and utverjdayut at a relative humidity of 60-98,0% for 3-24 hours. Layering lacquer polyurethane composition is carried out after drying of the previous layer to 3rd degree. Processed adhesive composition of the metal surface and(or) processed lacquer polyurethane composition is heated close the form with the seal around the perimeter of the contact zone, is heated to 100-120°and the gap is filled polyurethane composition and utverjdayut by known methods.

Use as a glue solution triphenyltetrazolium in dichloromethane or ethyl acetate contributes to the greatest increase of adhesion of the polyurethane lacquer compositions to metal due to structural grids and reaction between free isocyanate groups of the second layer and urethane groups of the polymer with the formation of allophanate groups or by reaction with the urea group, biuret.

Polyurethane coatings geophysical downhole devices operate in conditions of high mechanical loads from the side walls of the wells, physico-chemical effects of fluids, residues drilled rocks and reagents drilling fluids, however, the coating of rigid polyurethane provides the necessary balance between the acoustic transparency frequent in the x geophysical instruments, hosting acoustic emitters and receivers of the reflected signal. Elastic coating based on polyurethane compositions with a maximum absorption of acoustic radiation and packages waves interference in the middle part of the device is also used for forming the shoes available that are the most likely to suffer the frictional effect of the walls of the wells during their study. The use of polyurethane varnish and molded polyurethane for protection of the casing and shoes centralizers can significantly improve the patency of inclined wells without the use of additional prigroziv even in the heat of the wells in the permafrost zone, which leads to the formation of pockets and ledges.

This way spend glued to the metal during solidification molding of polyurethanes based on SKU-PFL-100 (polyoxyethyleneglycol with a molecular weight of 1000 and 2,4-toluylenediisocyanate cured with 4,4'-methylene-bis-orthocarolina). Other brands of polyurethane prepared on the same basis as that of the SSI-PFL-100, the difference is that the hardener for SKU-PFL-100 is introduced into the melt; for sue-5 - in powder form; for sue-26 - is added 1,4-butanediol in a mixture with polyoxyethyleneglycol and methyl methacrylate; hardener for sue-82 is a mixture of polyoxide is ametropias, glycerin and 4,4'-methylene-bis-orthocarolina in the ratio of 0.25:0.25 to:0,4.

As polyurethane varnish for forming a protective coating on the piston and spring centralizers geophysical downhole tools used lacquer "protect" THE 84-07509103.418-94, which represents an ethyl acetate solution of MDI with a dry residue of 60-80%, resulting from the reaction between excess MDI and polyester Laprol 4503.

"Lector" THE 84-07509103.498-98 is butylacetate solution MDI obtained by reaction between the polyester Laprol 5003 and excess MDI in the presence of perchlorovinyl resin.

Realor THE 84-07508103.505-99 is butylacetate solution of MDI, based on Laprol 5003 and 4,4'-diphenylmethanediisocyanate.

ACP-TU UR 84-07509103.466-96 is acetone solution of MDI, based on the mixture of low molecular weight polyether with an excess of 2,4-toluylene diisocyanate.

The method is implemented as follows.

Example 1. The metal surface of the casing MAC-2, a spring clamp and brackets shoes-centralizers treated with jobstream or sandblasting and degrease with acetone or gasoline. Applied by any known method adhesive composition based solution triphenyltetrazolium in dichloroethane (glue Leikonat) or this is acetate (Desmodur RE). Control of the thickness of the cured coating is carried out by known devices-devices - electromagnetic or ultrasonic methods - of the device attached to a certified calibration standard thickness. When applying the adhesive coating airbrush to control the thickness of the coating is more convenient to use a pre-prepared standard flat plate of the same brand of metal, held the same preliminary training and coated with the adhesive composition with the known thickness of the coating (one side is 1 μm, the second side - 3 μm). On the cylindrical surface standard thickness gauges have an error of more than 0.5 μm. The use of brushes for the application of the adhesive composition is not desirable because of their quick (3-5 minutes) destruction.

When the thickness of the adhesive coating is less than 0.5 μm and more than 3 μm on the metal surface of the device MAC-2 in the area of the generator of ultrasonic pulses is detached polyurethane coating formed by curing MDI, deposited on the surface in the form of a solution in acetone, ethyl acetate or butyl acetate, atmospheric moisture during prolonged sequential ultrasonic pulse generator MAC-2 in the environment of formation fluids. The same character of delamination of the polyurethane coating is observed if m is lichnogo shade cover and small gas inclusions in the coating layers and layers of polyurethane coating thickness of more than 250 μm. In this case, the defective areas are cleaned sandblasting, degreasing and repeat the treatment again. Polyurethane coating thickness of 60-200 μm provides an optimal window of transparency for the passage of ultrasonic pulses through the surface of the metal is + polyurethane coating in areas where the generator and receiver of ultrasound.

Covered with the adhesive composition to the metal surface of the casing, and springs of the centralizer leave for 12-18 h at 20-25°C and relative humidity of 30-98% or thermoablative 15-30 minutes at 100°C. Then the surface is applied by brush or spray one-component polyurethane lacquer, representing a solution of MDI, based on the polyether with an excess of diisocyanate in an organic solvent is acetone, ethyl acetate or butyl acetate, depending on the brand layer 30-70 ám in the temperature range from -10°C to +30°, utverjdayut to 3rd degree at a relative humidity of 60-98% and then the same procedure is applied to the second and third layers of polyurethane varnish, after the final coat is applied and cured to 3rd degree get a thick coating of 30-250 microns, make the shutter speed 24 h (table., position 9-12). Control the thickness of the coating of known thickness gauge and, if necessary, put an additional floor.

Example 2. Go active is ivanie molded polyurethane on the basis of the SSI-PFL-100, The NTG-5 NTG-26 or sue-82 on the middle part of the device MAC-2, coated with the adhesive composition and a protective polyurethane coating obtained in example 1, and represents a thick-walled metal pipe, the side surface which is a complex system of milled grooves of different width to a depth of up to 50% of the thickness of the pipe and deployed relative to each other at different angles to ensure divide acoustic coupling between the ultrasonic generator and receiver placed on the opposite smooth the ends of the tube. The middle part of the tube is closed with a heated metal form, condense on the surfaces of the contact is heated to 100-120°With, fill in the gap of known polyurethane composition (on the basis of the SSI-PFL-100, GP-5, GP-26 or sue-82) and utverjdayut in a known manner. The result is perfectly smooth surface of the chassis MC-2, having on the outer surface of two types of protective polyurethane coating. On smooth pipe ends polyurethane coating has a window transparent to ultrasonic vibrations, and in the middle part of the instrument polyurethane coating has the properties of the acoustic damper and additionally absorbs ultrasound.

Example 3. Metal brackets shoes clamp, coated with an adhesive composition based solution triphenylmethane isocyanate in dichloroethane (glue Leikonat) or ethyl acetate (Desmodur RE) layer of 1-3 μm, as described in example 1, is enclosed in a metal form, represents a part of a spherical segment with a diameter corresponding to the diameter of the exploration well sealed around the perimeter and provided with a heater and heated to a temperature of 100-120°C. Through the pouring spout in the gap fill in the known polyurethane composition on the basis of the SSI-PFL-100, GP-5, GP-26 or sue-82 and utverjdayut known method.

The result is a smooth, wear-resistant shoes, allowing you to accurately centered in the borehole geophysical exploration instrument MAK-2 and do not use additional prigroziv with the passage of inclined wellbores, particularly in terms of perennial permafrost.

Tests polyurethane coated downhole apparatus of MAC-2 was performed in the conditions of a complex influence on the gas-condensate wells fields of the Far North.

Resource protective characteristics of the adhesive coating and the amplitude of the useful signal was assessed by inspection of the external surface of the coating, the quality analysis of acoustic spectrograms and the reduction of labor costs for cleaning downhole apparatus from the well fluid by repeated scanning profile wells.

The table shows the test results of the coatings on the device MAC-2 obtained in accordance with the prototype pic is BA bonding polyurethanes (PL. position 1-8) and the proposed method (table. position 9-16).

The advantage of the proposed method is that the adhesion of the polyurethane coating on the metal surface allows the average 6 or more times to increase the lifetime of a surveying instrument for exploration wells against the same polyurethane coating that is adhered to the prototype method, with a significant improvement of complex acoustic characteristics of the signal in the receiver-logger.

The proposed method is covered PU two geophysical instrument MAK-2, which pass these tests in the Far North.

Passed over 30,000 meters tripping operation in inclined wells. Simplified maintenance the device, the protective film after two months of work has no signs of wear.

ExampleElastomerThe nature of the traces of coating failureThe effect on the spectrum of the acoustic signalLifetime days
wearpeeling
1Protect-+-5
2Lektor -+-
3Realor-+-7
4ACP-UR-+-5
5SKU-PFL-/+++10
6Sue-5-/+++7
7Sue-26-/+++8
8Sue-82-/+++7
9Protect--->60
10Lektor--->60
11Realor--->60
12ACP-UR--->60
13SKU-PFL-/+-+>60
14Sue-5-/+-+>60
15G is P-26 -/+-+>60
16Sue-82-/+-+>60
Note. Wear and tear: - - no

+ - the presence of a significant

-/+ - traces

Delamination:

+ - presence

- - no

Acoustic signal:

+ - absorption

- - the absence of absorption

1. Method of bonding a protective polyurethane coating to a metal surface, comprising applying the adhesive composition, followed by exposure, application of a polyurethane composition and curing, wherein the pre-coated adhesive compositions based solution triphenyltetrazolium in an organic solvent, in the following ratio of components, parts:

Triphenyltetrazolium18,0-30,0
Organic solvent70-82

thickness of 0.5-5 μm, preferably 1-3 μm, incubated for 15-30 min at 100°or 12-18 h at 20-25°C and relative humidity of 30-98%, then applied a protective coating based on polyurethane varnish and(or) castable polyurethane composition and utverjdayut him know who Tim way.

2. The method according to claim 1, characterized in that the lacquer polyurethane composition, representing a solution of MDI in an organic solvent, is applied in layers on the metal surface to form a protective coating thickness 30-250 μm, preferably 60-200 μm, by any known method at a temperature of from -10 to +30°and utverjdayut at a relative humidity of 60-98,0% for 3-24 hours

3. The method according to claims 1 and 2, characterized in that the layering lacquer polyurethane composition is carried out after drying of the previous layer to grade 3.

4. The method according to claims 1 to 3, characterized in that the treated adhesive composition of the metal surface and(or) lacquer polyurethane composition is heated close the form with the seal around the perimeter of the contact zone, is heated to 100-120°and the gap is filled polyurethane composition and utverjdayut by known methods.



 

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