Composition for preservation of metallic objects, especially oil- field equipment, during in-process storage and transportation

FIELD: corrosion protection.

SUBSTANCE: invention is designed for oil production and can also be used in mechanical engineering, instrumentation engineering, and other branches. Composition contains 6-10% low-grade lignosulfonates, 2-5% industrial oil (spindle oil, tall oil, or MS-20 oil), 60-65% production waste, and 24-28% additive, namely primary C8-C11-amines. Production waste is, in particular, vat residues from production of synthetic fatty C10-C-acids or solid petroleum hydrocarbons: asphaltene-tar-paraffin deposits formed during production and transportation of petroleum. Use of composition increases degree of protection of metallic objects against corrosion under atmospheric precipitate conditions owing to retained high adhesion of coating formed from composition to metal, reduced porosity of coating, and prolonged period of time before appearance of the first center of corrosion attack at lower thickness of coating.

EFFECT: improved anticorrosion characteristics, simplified composition preparation technology, reduced coating formation time, and reduced expenses due to utilized waste.

2 cl, 2 tbl

 

The invention relates to the field of protecting metals from corrosion, in particular to the compounds forming washable film coating on the steel surface and designed to protect products from ferrous and non-ferrous metals from exposure to the environment during their production and storage during transportation. Primary use - protection against atmospheric corrosion of parts of oilfield equipment. The invention can also be used in machine-building, instrument-making and other industries.

Famous composition “Oromin”, featured GOST 9.014-78 as a rinse-off film coating for protection (conservation) products from ferrous and non-ferrous metals during storage and transportation. The composition is a solution of sodium stearate in hydrocarbon solvents, i.e. contain toxic and flammable components. Before applying the product known composition requires heating at least up to +80°to achieve operating viscosity. In addition, the necessary surface preparation products - drying, rust removal for producing high-quality coverage and prevent manifestations film corrosion. All this greatly complicates the technological scheme of inhibiting protection. After the deposition of the metal protective coating obtained is e from the specified known composition, is a semi-solid waxy film, easy to remove, even with a small mechanical force.

Also known composition for corrosion protection of metal products in the interim period and their long-term storing, containing, wt.%: multifunctional additive of 5.1-5.4 and ingibirovany water-wax emulsion IVS M rest. This multifunctional additive contains, wt%: distillation residues from the production of synthetic fatty acids (COSGC) 1,0-1,1; microcrystalline cellulose 1,71-2,79 or methylcellulose 0.1 to 0,11; the product of the interaction of cyclohexylamine with synthetic fatty acid fraction With10-C131,29-1,30 (Application OF No. 95112614, CL 09 D 191/06, epubl).

The main disadvantage of this known composition, as the composition of Oremin”should be attributed, primarily, low physical and mechanical properties of the coating formed after application of known composition on the metal surface.

The closest in technical essence to the proposed composition is a protective coating composition comprising the following ingredients, wt.%: technical lignosulfonates 10-15; tall oil pitch 45-70, tall oil 2-7; rosin or petrolatum 7-45; xylene 40-66; aluminum powder 0.8-2.0 (auth. mon. The USSR №1732677, CL 09 D 5/08, 1989).

The specified protective coating applied on g is unduly layer, which, in turn, directly apply on the surface of metal products (possibly the presence of rust). Known coating used to protect steel products from corrosion in the atmosphere of chlorine, sulphur dioxide and air.

The disadvantage of this known coating, as in the case of composition “Oromin”is necessary at the stage of preparation of the application of large quantities of toxic and flammable organic solvents (for example, up to 66% of xylene) and the mandatory use of high temperature (up to 100° (C) to obtain a mixture of the required viscosity and homogeneity.

In addition, some of the ingredients specified coating scarce and expensive (in particular, tall oil pitch and tall oil - specific by-products cellulosebased production).

In addition, the coating is characterized by insufficient resistance to the effects of precipitation (rain, sleet), reflected in the rapid emergence of foci of corrosion on the metal, even after brief exposure of products with known coating outdoors.

The technical result provided by the proposed structure is to increase the degree of protection of metal products from corrosion under the influence of atmospheric precipitation by maintaining these conditions is x high adhesion formed from the inventive coating composition to the metal, reduce the porosity of the coating, the longer the period of time until the first outbreak of corrosion, while reducing the thickness of the coating.

Additional technical result is a simplification of the preparation of the claimed composition and reducing the time to obtain coverage.

Another additional technical result is the disposal of produced along with oil waste waste - asphaltoresinparaffin deposits (ARPD).

This technical result is achieved by the proposed composition for the preservation of metal products, mainly oil field equipment, in-process storage and transport, including technical lignosulfonates, industrial oil, waste production and Supplement, as the waste product of the composition contains the waste production of synthetic fatty acid fraction With10-C17KOSIK or solid petroleum hydrocarbons - asphaltoresinparaffin deposits of sediment, waste, generated during the extraction and transportation of oil and an additive composition contains primary amines C8-C11when the following ratio of ingredients, wt.%:

Technical lignosulfonates 6-10

KOSIK or ASPO 60-65

Primary amines C8-C1124-28

Industrial oil 2-5

As the e industrial oils offer the composition contains spun oil, tall oil or butter brand MS-20.

Using the proposed structure eliminates the need for prior application of a primer layer as in the prototype, since a water-soluble lignosulfonate absorb moisture present on the surface of the metal, and a mixture of amines having a high pH (~12-13), is a modifier rust and at the same time provides a high degree of adhesion of the coating to the metal.

Using as a basis the proposed composition KOSIK or ASPO allows you to get on the metal surface a dense pore-free film that is impermeable to corrosive components present in atmospheric conditions.

And industrial oil provides elasticity resulting coating.

The proposed composition was obtained and tested in laboratory conditions. For its preparation were used the following substances:

- Technical lignosulfonates (LST) (OST 13-183-83) mark (A) with a solids content of 47%, mass fraction of ash to the mass fraction of dry substances of 16%, a density of 1.23 g/cm3and with a content of hydroxyl groups of 1.1%, carbonyl groups of 0.7%, metaxylene groups 11%, high molecular weight fraction of 36.3%, weight fraction, or 30.2%, low molecular weight fractions of 33.5%;

- COSIC (TU 2499-002-24211256-94) are the waste product of synthetic girn the x acid fraction With 10-C17(grade a). Are a mixture of resin and fatty acids nesomyinae substances. In the examples used KOSIK in the form of a waxy mass brown, an acid number of not more than 140 mg KOH/g, the proportion neomillennial substances 67%, of resin acids and 10%. The softening temperature of 40°C;

- ASPO are dumping waste in the extraction and transportation of oil, they are obtained under certain conditions by deposition on the walls of pipelines and oil equipment, hindering the passage of the process. After cleaning mechanically ASPO stored in tailings ponds. Are a mixture of solid hydrocarbons of the paraffin series, asphaltenes and resins. In the examples used paraffin with paraffin content up to 80%, of resin to 5%, asphaltenes to 8%. The softening temperature of -27°C;

Primary amines fraction C8-C11issued by TU 2516-001-33671256-93. Are a dark brown liquid;

- Industrial oils:

- spun oil (TU 38.1011232-89), which is a viscous liquid mixture of hydrocarbons - light-brown color, designed for lubrication of bearings, high-speed spindles in machine tools and other Kinematic viscosity of oil - 15-20 FTAs;

- tall oil in THE 13-00281074-26-95;

oil Mar and MS-20 (MS-8) according to GOST 21743-76.

The inventive composition was prepared as follows.

Example 1. To obtain a composition in the laboratory took 33 g of primary amines C8-C11and was heated on a water bath to a temperature of +40-50°C. Then they were introduced 56 g KOSIK and stirred until complete dissolution. After cooling the mixture to room temperature it was added 7 g lsls and 4 g of spun oil. Got the part, representing a homogeneous dark brown liquid, with the following ratio of ingredients, wt.%:

Lsls 7

Primary amines C8-C1133

KOSIK 56

Spun butter 4

Example 2. To obtain a composition in the laboratory took 22 g of primary amines C8-C11, was heated on a water bath to a temperature of +40-50°C. Then they were introduced 61 g) and stirred until complete dissolution. After cooling the mixture to room temperature it was added 9 g lsls and 8 g of tall oil. Got the part, representing a homogeneous dark brown liquid, with the following ratio of ingredients, wt.%:

Lsls 9

Primary amines C8-C1122

ASPO 61

Tall oil 8

Compositions with different content of ingredients was prepared in a similar manner.

Application of the proposed structure on the surface of metal products was carried out by SL is blowing ways: by dipping method, either by brush, roller or pneumatic spraying in a single layer in an amount such that the film thickness was 35-90 μm (depending on the method of application). Next I made a drying products on the air for 20-45 minutes depending on the thickness of the applied film and the ambient temperature. As a result, the surface of the treated products gets hard lacquer film (adhesion 1-2 points by the method of lattice cuts).

Criterion reliability protection when using weather-resistant coatings according to GOST 9.014-78 is the appearance after testing the minimum number of foci of corrosion on the metal while maintaining such coverage settings, as appearance, adhesion to metal, the elasticity of the film. Test coverage obtained from the proposed structure, carried out according to GOST 9.054-75 in termokhimicheskoi camera G-4 in the atmosphere, salt spray and 100%humid air. The testing temperature of 40±1°With; the total duration of the test - 336 hours For comparison under the same conditions experienced coating of grease gun (GOST 19537-83)recommended GOST 9.014-78 to protect products from ferrous metals from atmospheric corrosion and the coating obtained from the composition of the prototype. The results are presented in table 1.

Given that the conditions of storage of metal products, processed proposed the composition, suggest storing them in including and outdoors in heavy precipitation (rain, snow), were given full-scale tests of the coatings obtained from the proposed structure.

Full-scale tests were carried out according to GOST 9.039-74 in the winter time. The test duration is 90 days. The samples were placed on the stand in the open air (atmospheric precipitation - snow, sleet, humidity during the testing period - 70 to 90%, temperature up to -15° (C)and unheated room (humidity 80%for temperatures up to minus 10°). The results are given in table 2.

Studies have shown that the coating obtained from the proposed composition as a coating on the prototype, is characterized by high stability in conditions of exposure to humid air and salt spray. However, the impact of atmospheric precipitation (rain, snow) in the open air, the coating obtained from the inventive composition has the following advantages over the floor of the prototype:

- the rate of adhesion in these conditions is higher in 1,5-2 times;

- porosity after testing is extremely small value 2-3 pieces/cm2, while the prototype - 30% area coverage;

first hearth corrosion appears only after 60 days of testing, while the prototype is already in 20 days;

and the area of corrosion damages after 90 days from the proposed composition of only 10%, while the prototype is 80%.

Along with these advantages in properties, there are also advantages in the technology of obtaining of the proposed structure:

- decreases the temperature at which the preparation of the proposed structure;

- reduce the amount of drying of the coating 20-40 times.

Owing to the above advantages, the use of the claimed composition for preservation of oilfield equipment and other metal products will provide them with high-quality corrosion protection when stored indoors, outdoors, in the presence of precipitation, and, in addition, to protect them during transportation.

Along with this due to the fact that the coating obtained from the proposed composition is a rinse-off eliminates clogging submersible pumps and other working in the borehole equipment fragments of insoluble coating obtained from the proposed structure.

In addition, it becomes possible to dispose the junk waste, appearing in the extraction and transport of oil.

1. The composition for the preservation of metal products, mainly oil field equipments and the tion, when inter-operational storage and transportation, including technical lignosulfonates, industrial oil, waste production and an additive, characterized in that as a waste product of the composition contains the waste production of synthetic fatty acid fraction With10-C17KOSIK or solid petroleum hydrocarbons - asphaltoresinparaffin deposits of sediment, waste, generated during the extraction and transportation of oil and an additive composition contains primary amines C8-C11when the following ratio of ingredients, wt.%:

Technical lignosulfonates 6-10

KOSIK or ASPO 60-65

Primary amines C8-C1124-28

Industrial oil 2-5.

2. The composition according to claim 1, characterized in that as an industrial oil composition contains spun oil, tall oil or butter brand MS-20.



 

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