Thermochemical composition for removing deposits asphaltoresinparaffin

 

(57) Abstract:

The invention relates to the oil industry and can be used to remove asphaltoresinparaffin, resin and paraffin deposits from oil-field equipment, piping and tanks. The technical result is to increase the efficiency of removal of high-melting paraffin due to the high ekzotermicheskie its chemical interaction of the reactants, accompanied by an increase in the amount of heat per unit volume of the reaction mixture. Thermochemical composition for removing asphaltoresinparaffin deposits of oil field equipment, piping and tanks contains, wt%: sodium nitrite 15-100, water - rest, and an aqueous solution of other reagents containing, wt.%: sulfamic acid 9-30, technical aqueous ammonia 6-22, water - the rest. table 2.

The invention relates to the oil industry and can be used to remove asphaltoresinparaffin, resin and paraffin deposits from oil-field equipment, pipelines n tanks.

During production, transport and storage of oil on the inner surface of oilfield equipment accumulated oil ASPO,3and consisting of asphaltenes, resins, waxes, water and mechanical impurities, little soluble in petroleum solvents nature. The removal of sediment intensified at temperatures close to the temperature of melting (50-80oC).

The number of known structures for removal of solid paraffin using thermochemical methods that are close to the proposed technical essence.

To remove paraffin are used the reaction of acidic solutions of ammonium salts (chloride, sulfate, nitrate) and an aqueous solution of sodium nitrite, which lead to the formation of salts of sodium, water, and nitrogen and are accompanied by the release of a large amount of heat, for example:

NH4Cl(p-p)+NaNO2(p-p)-->NaCl(aq)+2H2O+N2(gas) Ho=-309 kJ/mol

The increase in the temperature of the reaction medium leads to melting and separation of deposits from the walls of oilfield equipment. As the initiators of the oxidation reaction was used hydrochloric acid (patent US 4755230, C 23 G 005/036, C 23 G 005/024), acetic acid (patent RU 2106211, 08 IN 9/08; US 5891262, 08 At 007/04 08 In 009/02; US 5183581, E 21 B 043/25, E 21 B 043/28) and copolyamide adipic acid and a linear aliphatic dicarboxylic acids (patent US 6003528, 08 At 009/00). The disadvantage of the compositions is their nedostatochnaia the solution to the technical essence and the achieved effect is the composition, consisting of two solutions: - ammonium chloride, surfactants and aluminum chloride, B - sodium nitrite (patent RU 2146725, C 23 G 1/00, E 21 In 37/06). Aluminium chloride is the initiator of the reaction, creating an acidic environment by hydrolysis in water. The disadvantage is low suitability to remove high-melting paraffin and the propensity of aluminum salts to hydrolysis in neutral and weakly acidic media with the formation of the bulk gel of aluminium hydroxide capable of deposition on the walls of oilfield equipment.

Solved by the invention the purpose of improving the effectiveness of removal of high-melting paraffin due to the high ekzotermicheskie chemical interaction declared in the composition of the reagents, accompanied by an increase in the amount of heat per PA unit volume of the reaction mixture.

The technical result is achieved by the fact that you are using thermochemical composition for removing asphaltoresinparaffin deposits of oil field equipment, piping and tanks, including sodium nitrite and an aqueous solution of other reagents, wherein the sodium nitrite has the following composition, wt.%:

Sodium nitrite - 15-100

Water - the Rest

and as is/BR> Technical aqueous ammonia - 6-22

Water - the Rest

Sulfamic acid (NH2SO3H) produced by THE 6-03-381-75, widely used in oil industry, in particular for acid treatment of bottom-hole formation zone. Its application has permission NGOs "Ayanavaram" from 28.12.1988,

Technical aqueous ammonia and sodium nitrite used in the composition, are produced in accordance with GOST and GOST standard 9-92 19906-74 or THE 38-102-74-79 respectively.

Sulfamic acid, partially neutralized with ammonia, is both a participant and initiator of oxidation of ammonium and amide groups nitrite ion, which is accompanied by release of a large amount of heat is:

NH4OH(p-p)+NaNO2(p-p)-->NaOH(p-p)+2H2O+N2(gas)

NH4SO3H(p-p)+NaNO2(p-p)-->NaHSO4(p-p)+H2O+N2(gas)

To determine the effectiveness of the proposed structure on the steel plate weighing 1.5 g evenly applied ASPO, determined the weight applied ARPD and put the plate in a cylindrical vessel containing sodium nitrite. Then sodium nitrite within 20-30 C was added a solution A. the Reaction mixture is not stirred. Intense reaction cont mixture was 65-90oWith depending on the concentration of the reactants. After the reaction was weighed dry plate to determine weight not washed ARPD and expected removal efficiency. Used ASPO Prirazlomnoye field (Bush 50, bore 760) with a melting point 63-67oC. the Experiments were carried out at a temperature of 20oC.

Examples of the compositions and the results of removal of deposits is given in table. 1 (in parentheses are the concentrations of the interacting substances in wt.%), which shows that the inventive composition effectively removes paraffin.

In comparable conditions was tested in the part of the prototype. The results from the removal of the deposits are given in table. 2 (in parentheses are the concentrations of the interacting solutions in wt.%), which shows that the compositions according to the prototype less effectively remove paraffin. Moreover, the use of these compounds is complicated by the selection of gel Al(OH)3that tends to adsorption on the inner surface of oilfield equipment (experience 1,3 and 4 in table. 2).

Thus, the inventive composition has the following advantages compared with the known prototype composition:

- effectively removes high-melting paraffin;

- does not form during chemical PR is UKTI reaction environmentally safe.

Thermochemical composition for removing asphaltoresinparaffin deposits of oil field equipment, piping and tanks, including sodium nitrite and an aqueous solution of other reagents, wherein the sodium nitrite has the following composition, wt.%:

Sodium nitrite - 15-100

Water - the Rest

and as an aqueous solution other reagents use a solution that contains, wt%:

Sulfamic acid - 9-30

Technical aqueous ammonia - 6-22

Water - Ostalnoe

 

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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.

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

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FIELD: oil and gas production and corrosion protection.

SUBSTANCE: composition according to invention, which can be used for asphaltene-tar-paraffin deposits from bottom zone of formation, discharge pipes, oil-collection reservoirs, and oil-field equipment, contains 1-5 vol % nonionic surfactant: oleic acid, С912-alkyl-phenol, С910-alkyl-phenol, or N-alkyl-3-methyl-5-ethylpyridinum bromide in solvent; 1-5% cationic surfactant: product of reaction of primary and secondary aliphatic amine mixture with industrial-grade dimethyl phosphite; and solvent (Absorbent A) in balancing amount. Composition can also be based on straight-run gasoline containing in this case 10 to 50 vol % Absorbent A.

EFFECT: increased cleaning efficiency in combination with anticorrosive effect and reduced expenses on reagents.

2 cl, 3 tbl, 23 ex

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

2 ex, 7 tbl

FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency, simplified method, higher productiveness, higher ecological safety.

31 cl, 1 tbl, 1 ex

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3 ex, 4 tbl

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3 ex, 3 tbl

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EFFECT: higher efficiency, broader functional capabilities.

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EFFECT: 5 cl, 3 tbl

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