Paraffin deposit-preventing hydrophilic property imparting composition

FIELD: oil and gas production.

SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.

1 dwg, 5 tbl, 5 ex

 

The invention relates to the oil industry and can be used to protect the inner surface of the transport pipelines from the asphalt-resin-paraffin deposits. The mechanism of the protective action is to create a hydrophilic protective film on the surface of the equipment, preventing sticking of the paraffin crystals and the formation of a sediment layer which is firmly bonded to the metallic surface.

Known composition for hydrophilization internal surface of pipelines, including,% wt.:

carboxymethylcellulose 32

sodium hexametaphosphate 60

ethoxylated alcohol 8

used in working concentration of 3.2 g/l of water. (V.e.gubin, AMB. Pumping of high-viscosity oils with wall layer of the wetting composition.//Transport of oil and oil products." 1980 - No. 4. - C. 3-6).

The disadvantages of this structure are:

- protection of the pipeline from maloperation deposits for a short time;

- negative impact on the primary processes of preparing water-cut oil. Thus, the composition contributes to the stabilization of water-in-oil emulsion, thus complicating the process of demulsification.

Closest to the proposed invention is a composition for hydrophilization internal surface of pipelines, including, % wt.:

polyacrylamide 0,02-2

CT is Oxymetazoline 0,1-0,5

nonionic surfactant 0,001-0,01

water the rest

(Pagamento, Alimov, Weimarische, Pentosin. Composition for preventing deposition of paraffin// USSR Author's certificate No. 794193, E 21 In 43/00, 07.01.1981, 3).

The disadvantages of this structure are:

- protection of pipelines from maloperation deposits for a short time;

- negative impact on the primary processes of preparing water-cut oil. The composition contributes to the stabilization of oil-water emulsions, complicating the process of demulsification.

The present invention is the creation of hydrophilizing composition, ensuring the protection of pipelines from the deposition of paraffin for a longer time and at the same time exhibiting the properties of demulsifier.

The problem is solved due to the fact that in hydrophilizing composition for preventing deposition of paraffin containing polymer, nonionic surfactant, nonionic surfactants and water, as a polymer it contains polyvinyl alcohol as the nonionic surfactants - additive FC 2000 PLUS in the following ratio of components, wt.%:

polyvinyl alcohol of 0.5-10

additive FC 2000 PLUS 0.01 to 1

water the rest

Additive FC 2000 PLUS is a composition of triglycerides, natural surfactants, saponified caustic to the Liem vegetable fatty acid and polyethylene glycol ethers of.

As a main component hydrophilizing composition is used polyvinyl alcohol, the molecules of which form with water molecules strong hydrogen bonds. This explains the stronger retention of water film layer hydrophilicity compositions based on polyvinyl alcohol, which increases the protective properties of the composition. The auxiliary component that improves the wettability of the metal surface and detergent properties of the composition, is of nonionic surfactants - additive FC 2000 PLUS, does not cause sludge formation in water of any salinity. The proposed ratio of the components attributable to the following. When the concentration of the main component is polyvinyl alcohol is below 0.5% wt. it is difficult to process its adsorption on the metal surface and durable polymer protective film on the metal surface is not formed. The use of a solution of polyvinyl alcohol with a concentration above 10% by weight. it is impractical for economic reasons. Solutions of nonionic surfactants additives FC 2000 PLUS at concentrations below 0.01 wt.%. - does not have a noticeable detergent properties; the increasing concentration of nonionic surfactants above 1% wt. it is not economically feasible. In addition, concentrated solutions of the additive FC 2000 PLUS can help stabilize water-oil emulsion, which will reduce demolicious the properties of the composition.

Thus, the set of essential features set forth in the claims, allows to achieve the desired technical result. Namely, the inventive composition provides protection of pipelines from the deposition of paraffin for a longer time and at the same time exhibiting the properties of demulsifier.

Examples of specific implementations

We conducted laboratory studies have compared the effectiveness of the developed composition and its prototype. Laboratory studies were carried out on the installation by examining the process of formation of paraffin sediments based on the known method of “cold core”.

The scheme of the laboratory setup for studying the process of the paraffin method "cold core " is presented on the drawing: 1 - chemical glass; 2 - oven/magnetic stirrer; 3 - metal "cold core"; 4 - PEEN.

In a thermostatted glass 1 was filled with 300 ml of condensate. The temperature was raised to 70°and 20 min were included mixing a magnetic stirrer 2. Then reduced the temperature to 60°and lowered into the condensate steel cylinder 3, the surface of which has been pre-sanded, degreased with hexane and ethanol, dried and treated the water with the polymer solution during 1 h Inside the cylinder was cooled with ice. Thus, was created on the cylinder wall temperature 60&x000B0; C. During the experience condensation in the glass was mixed with a magnetic stirrer for 15 min, after which the cylinder was removed from the glass, poured ice and poured water having a temperature of 25°C. the Mass remaining in the cylinder of the sediments was determined by the gravimetric method.

To assess the effectiveness of hydrophilizing action of aqueous polymer solutions use the following formula:

where m0is the mass of sediment in the control experiment;

m1mass deposits on hydrophilizing surface.

For tests used 20%oil emulsion artificially prepared from produced water and gas condensate field "Coastal" in the Krasnodar territory. Group composition of gas condensate and physico-chemical properties of produced water below.

Group hydrocarbon composition of the gas condensate:

Name fractions the fractions of,% wt.

Petroleum fraction (MK-60) 2,0

Aromatic hydrocarbons 13,2

Paraffin hydrocarbons 58,0

Naphthenic hydrocarbons 26,1

Unsaturated hydrocarbons 0,7

Total 100,0

Paraffin wax content of 4.3

Physico-Himicheskaya brine:

Indices Value indicators

Density 1,1709 g/cm3

Hydrogen pokazatel is, pH 7,52

The rigidity of 1.4 mmol/DM3

Compared the efficacy of the following structures:

Example No. 1 (prototype) 1.5 g of polyacrylamide is dissolved under stirring in 200 g heated to 50°With water. 0.9 g of carboxymethyl cellulose are dissolved under stirring in 97.6 g heated to 50°With water. The obtained solutions combine, add 0.015 g OP-10, are thoroughly mixed until a homogeneous liquid.

Example No. 2 (proposed) 3 g of dry powder of polyvinyl alcohol are dissolved under stirring in 295,5 g heated to 50°With water, add 1.5 g of nonionic surfactant FC 2000 PLUS. The mixture was thoroughly stirred to obtain a homogeneous liquid.

Physico-chemical characteristics of the reagents listed in table 1.

Examples No. 3-5 perform similarly to example 2, changing the quantitative ratio of the components in the composition.

The specific formulations hydrophilicity compositions and test results are presented in table 2. The influence of the studied compositions in the process of separating oil-water emulsions are presented in table 3.

As can be seen from the test results of the inventive composition, the compositions more effectively protects the equipment from deposits of paraffin. In addition, it has pological the impacts on the process of separating the produced emulsion, that is exhibiting the properties of demulsifier. The advantage of the proposed structure is the use of components manufactured by the domestic industry.

Table 1

Physico-chemical characteristics of the reactants.
Polyvinyl alcohol (TU 2215-018-00203766-98)
Name of indicatorValue
Dynamic viscosity, PA·103not more than30
Mass fraction of volatile substances, %, no more than6
Mass fraction of acetate groups, %, max1
Solubility in water, %, not less than99,0
Mass fraction of sodium acetate, %, max12
Guaranteed shelf life1 year.
FC 2000 PLUS (TU 2458-001-49472578-98)
Name of indicatorValue
Appearancedark viscous liquid
Mass fraction of moistureNo more than 15%
pH8-9
Foaming activitynot more than 60 cm3
Nigeriapercentage tension of 0.5% aqueous solution on the border with kerosene at least 70%

Table 2

Research on the efficiency hydrophilicity trains
ReagentThe mass of sediment, gEfficiency, %
Legitimizirovannykh2,731 
metal  
Example 1 (prototype)0,5281
Example 2 (proposed)0,3487,5
Example 3 (0,5% wt. The PVA 0,01%0,4982
wt. FC 2000 PLUS)  
Example 4 (10% wt. PVA, 1% wt.0,3089
FC 2000 PLUS)  
Example 5 (5,25% wt. PVA, 0,5%0,3886
wt. FC 2000 PLUS)  

Table 3

The influence of polymer solutions on the separation of water-oil emulsion
Brand polymerTime min
 5100 406090
Emulsion without additivesThe emulsion is not divided
Example 1 (prototype)000101530
Example 2 (proposed)5088100100100100
Example 35088100100100100
Example 47590100100100100
Example 55090100100100100
The table gives % about. the separated water.

Hydrophilicity composition for preventing deposition of paraffin in pipelines containing polymer, nonionic surfactant, nonionic surfactants and water, characterized in that the polymer it contains polyvinyl alcohol as the nonionic surfactants - additive FC 2000 PLUS in the following ratio, wt. %:

Polyvinyl alcohol of 0.5 - 10

Additive FC 2000 PLUS 0.01 to 1

Water the Rest



 

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SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

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