Thermochemical composition for removing deposits asphaltoresinparaffin

 

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 deposits due to higher ekzotermicheskie 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, comprising an aqueous solution of sulfamic acid and technical aqueous ammonia and an aqueous solution of inorganic oxidant reagent, as inorganic oxidant reagent contains sodium hypochlorite and aqueous solutions have the following ratio of components, wt.%: sulfamic acid 3-30; technical aqueous ammonia 18-70; water the rest; and sodium hypochlorite 7-20, water the rest. table 2.

The invention relates to the oil industry and can be used to remove asphaltoresinparaffin deposits (ARPD) of oilfield equipment is neftepromyslovoe equipment accumulated oil ASPO, reducing the working section of pipeline and storage capacity of reservoirs. ASPO 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 (aq)+NaNO2(aq)--> NaCl (aq)+2H2O+N2(gas);No=-309 kJ/mol 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 At 009/02; US 5183581, E 21 B 043/25, E 21 B 043/28) and copolyamide adipic acid and a linear aliphatic dicarbonate high-melting paraffin.

Closest to the proposed technical solution to the technical essence and the achieved effect is a structure consisting of two aqueous solutions: A - sulfamic acid (9-30 wt.%), technical aqueous ammonia (6-22 wt.%), the rest is water and B is sodium nitrite (15-100% by weight), the rest of the water (patent RU 2186948 Cl, E 21 B 37/06, 10.08.2002). Sulfamic acid contains oxidizable amide nitrogen and the acid function. Amide group of sulfamic acid is oxidized by sodium nitrite with the formation of sodium hydrosulphate, water and nitrogen gas.

NH2SO3H (aq)+NaNO2(aq)-->NaHSO4(aq)+H2O+N2(gas);No=-40020 kJ/mol.

The oxidation reaction takes place only in an acidic environment and sulfamic acid at the same time acts as a reagent thermo-chemical composition and initiator of the process. The disadvantage of a low thermal effect interactions, which are poorly removed high-melting paraffin, and the presence of acid, which promotes corrosion of the equipment.

Solved by the invention the task is to develop the composition for removing deposits in alkaline environments and improving the efficiency of removal of deposits for which eghosa increase the amount of heat per 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, comprising an aqueous solution of sulfamic acid and technical aqueous ammonia and an aqueous solution of inorganic oxidant reagent, wherein as the inorganic oxidant reagent use sodium hypochlorite and aqueous solutions have the following ratio of components, wt.%: Sulfamic acid - 3-30 Technical aqueous ammonia - 18-70 Water - the Rest and Hypochlorite - 7-20
Water - the Rest
Sulfamic acid (NH2SO3N) 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 NGO Soyusneftepromhim" from 28.12.1988,

Technical aqueous ammonia and an aqueous solution of sodium hypochlorite (NaOCl) used in the composition, are produced in accordance with GOST and GOST standard 9-92 11086-76 or THE 6-01-1287-81 respectively.

It is known the use of sodium hypochlorite in thermochemical foaming sotavaenosaston thermal-oxidative system (nitrogen-containing compound and the oxidant) in the compositions of the present foaming agents and polymers for thickening aqueous solutions. Thermodynamic calculations on the formation enthalpies of substances /Karapetyants M. H., Karapetyants M. L. Basic thermodynamic constants of inorganic and organic substances. -M.: Chemistry, 1968, - 470 C./ show that the reactions involving sodium hypochlorite are not accompanied by significant heat dissipation. So thermal effects reactions
2NH4Cl+3NaOCl+2NaOH=N2+5H2O+5NaCl;
CO(NH2)2+3NaOCl+2NaOH=Na+3H2O+3NaCl+Na2CO3
respectively 242 and 249 kJ/mol.

In the present composition is used in an excess of ammonia, which allows you to completely neutralize sulfamic acid and bring the pH of the solution from acidic to alkaline environment. Sodium hypochlorite interacts with sulfamic acid, neutralized with ammonia, and excess ammonia, which is accompanied by release of a large amount of heat is:
NH2SO3H+NH4OH=NH2SO3NH4+H2About
NH2SO3NH4+3NaOCl+2NH2OH=N2+4H2O+3NaCl+(NH4)2SO4;
No=-(1700200) kJ/mol
thermal effect of the reaction was determined by standard method /Physical chemistry. Theoretical and practical guide / the ü sulfamic acid requires 3 mol of ammonia solution and 3 mol of sodium hypochlorite. In the case of an excess of the latter reagent also consider the following reaction:
2NH4OH+3NaOCl=3NaCl+N2+5H2O.

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 solution A. Then for him for 20-30 seconds was added a solution B. the Reaction mixture is not stirred. Intense reaction lasted 2-3 minutes During this time was cleaning steel plates of paraffin. The temperature of heating of the reaction 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 paraffin with melting 63-73oC. the Experiments were carried out at a temperature of 20oC.

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

In comparable conditions was tested in the part of the prototype. Removal results ASPO Postavy the prototype less effectively remove high-melting paraffin with a larger number of agents.

Thus, the inventive composition has the following advantages compared with the known prototype structure:
effectively removes high-melting paraffin in alkaline environments;
releases more heat, melting high-melting paraffin;
does not form during chemical transformations insoluble chemical compounds;
formed during the chemical transformations of the reaction products are environmentally safe;
participating reactants and formed during the chemical transformations of the reaction products do not cause corrosion of equipment.


Claims

Thermochemical composition for removing asphaltoresinparaffin deposits of oil field equipment, piping and tanks, comprising an aqueous solution of sulfamic acid and technical aqueous ammonia and an aqueous solution of inorganic oxidant reagent, wherein as the inorganic oxidant reagent use sodium hypochlorite and aqueous solutions have the following ratio of components, wt. %:
Sulfamic acid - 3-30
Technical aqueous ammonia - 18-70
Water - the Rest
and
Sodium hypochlorite - 7-20
Water - Else Is

 

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