The composition for removing asphaltene-maloperation deposits

 

(57) Abstract:

The invention relates to the oil industry and can be used when removing asphaltene-maloperation deposits (ARPD) in the process of oil extraction. The composition contains a hydrocarbon solvent and an additive is a mixture of 47.5-49,95 wt. % of nitrogen blockcopolymers of ethylene oxide and of propylene oxide with a molecular mass of ~5000 and 47,5-49,95 wt.% of cumene - polyalkylbenzenes resin with 0.1 to 5.0 wt.% the polyglycols mass ratio of 1: 1:0,002-0.1, respectively, in the following ratio, wt. %: mixture of 47.5-49,95 nitrogen blockcopolymers of ethylene oxide and of propylene oxide with a molecular mass of ~5000, 47,5-49,95 wt.% polyalkylbenzenes resin with 0.1 to 5.0 wt. % of polyglycols in a mass ratio of 1:1: 0,002-0.1, respectively 0.5 to 3.0 wt.%. Additive to improve its performance in winter conditions can also be used in the form of a solution in alkylbenzene fraction mass ratio of 1:1, where alkyl is isopropyl or ethyl, or butyl. Technical result: the effective removal of deposits of different hydrocarbon composition with a high content of paraffin waxes and asphaltene-resinous substances both in summer and in winter conditions. Alenia asphaltene-maloperation deposits (ARPD) in the process of oil production.

Known composition to remove and prevent the formation of deposits, including solvent - hexane fraction, easy pyrolysis resin and the surface-active substance (SAS) - oxygen-containing ethoxylated phenols [Ed. St. USSR N 1606518, From 09 To 3/00, E 21 IN 37/06, 1988, BI N 13]. The use of this structure is limited to use on oils containing up to 10% resin, 24 wt.% asphaltenes and 30% paraffins, and the concentration of surfactant in the composition is 25 to 70 wt.%. The composition is ineffective in sediments with a high content of asphaltenes.

Known composition for removing deposits comprising a hydrocarbon solvent and gasoline or kerosene fraction and surfactant is the condensation products of fatty acids and mono-(di)arylamino or research and optionally low molecular weight carboxylic acid [RF Patent N 2088625, From 09 To 3/00, E 21 IN 37/06, 1988, B N 24]. However, the structure is limited to use on paraffin containing paraffins no more than 50 wt.%.

Known composition for removing deposits containing as an additive light pyrolysis tar and oil-soluble surfactant, and the solvent - gas gasoline with the number of carbon atoms C4-C6[Ed. St. USSR N 1060666, From 09 To 3/00, E 21 IN 37/06, 1983, BI N 23]. One is closer to the proposed invention is a composition for removing paraffin, comprising a hydrocarbon solvent and an additive is a surfactant containing ethoxylated alkyl phenol with the number of hydroxyethyl groups 4 - 6 - (0.001 to 5 wt. %), the product of condensation of Diethylenetriamine and oleic acid in a molar ratio of(1: 1)- (1:2)-(0,001-5 wt.%) and additionally 2-butoxyethanol (0,002 - 10 wt.%) [RF patent N 2064954, FROM 09 TO 3/00, 1994, BI N 22]. The disadvantage of this structure is the low efficiency of removal of deposits with a high paraffin content.

The task of the invention is to develop a more effective composition for removing deposits with a high content of paraffins or asphaltene - resinous substances, the components of which can be used both in summer and in winter conditions.

The task is solved by providing a composition for removing deposits comprising a hydrocarbon solvent and an additive. And as additives it contains a mixture of 47.5 - 49,95 wt.% nitrogen blockcopolymers of ethylene oxide and of propylene oxide with a molecular mass of ~5000 and 47,5-49,95% wt. polyalkylbenzenes resin with 0.1 to 5.0 wt.% the polyglycols mass ratio of 1:1:0,002-0.1, respectively, in the following ratio, wt.%: a mixture of 47.5 - 49,95 wt.% nitrogen blockcopolymer oxide alcola mass ratio of 1:1:0,002 - 0.1, respectively - 0.5 to 3.0 wt.%; hydrocarbon solvent else.

The additive can also be used in the form of a solution in alkylbenzene fraction (winter form additives), where alkyl is isopropyl or ethyl, or butyl.

Azotosoderjashchig block copolymers of ethylene oxide and of propylene oxide with an average molecular weight of 5000. E. contains 27-28 hydroxyethyl links and 59-61 oxypropylene links is a trademark of Deproxin-157 (D-157). Produced according to TU 6-14-614-96. Physico-chemical properties Ciproxina-157 shown in table 1.

Polyglycols (GHG) emissions - waste production of glycols obtained by hydration of ethylene oxide and is a mixture of glycol (monoethylene glycol, diethylene glycol, triethylene glycol, tetraethyleneglycol and so on). Produced by THE 6-01-10-40-79. The main physico-chemical characteristics of PG are shown in table 2.

A byproduct of the production of cumene consists of a mixture of di-, tri-, Tetra-isopropylbenzyl and other more high-molecular polyalkylbenzenes and has a trade name polyalkylbenzene resin (ABS). Produced in accordance with TU 33.10296-83. Indicators of the quality polyalkylbenzenes resin presented in melting the surface tension at the boundary of ASPO-solvent, which increases the efficiency of the dissolution and destruction of deposits, and the presence solvotrode component ABSA leads to solvation already dispersed in the solution of the particles of asphaltenes and paraffins, preventing them from sticking together. The introduction of GHG increases the wetting ability of the composition.

The use of additives in the form of a solution in alkylbenzene fraction (Albf): etilbenzene fraction (ABF) or isopropylbenzene fraction (ipbf), or butylbenzene fraction (BBF) in a mass ratio of 1:1 is associated with the need to maintain its performance at temperatures below - 20oC. Ethylbenzene fraction produced according to TU 6-01-10-37-78, isopropylbenzene faction specifications 38.402-62-140-42, butylbenzene fraction on THE 38-10297-78.

As the hydrocarbon solvent composition contains: petrol BR-1 (gasoline "Shoe") or BR-2, produced respectively by THE 38101303-72 and GOST 443-76; gasoline-side zipper distillation column K-2, Hospitable installation integrated oil UCPN-II JSC "Tatneft", produced by THE 38101524-93 and hereinafter referred to as solvent R-1; product Gorchinskiy UCPN JSC Tatneft produced according to TU 38101524-93 and hereinafter referred to as solvent P-2. Physico-chemical hasty solutions showed in science and technology there is no object, identical in the claimed combination of features and the presence of the above features and advantages, these concentration ranges, which allows to conclude the invention according to the criteria of "novelty" and "inventive step".

The proposed composition are simply mixing the starting components when heated to 30-40oC.

In laboratory conditions, the destruction efficiency of sediment composition determine the gravimetric method. Sample paraffin is heated to the softening temperature and mix thoroughly until smooth. The resulting homogeneous mass is formed sample ASPO cylindrical d = 13 mm and h = 16 mm, cooled for 2 hours, then placed in a pre-weighted basket of brass (steel) with grid cell size of 1.5 x 1.5 mm, Weight of sample ASPO within 2.8 to 3.5, the Size of the baskets 70 x 15 x 15 mm Basket with sample ASPO again weighed and found the weight of deposits with an accuracy of 0,005 0, a Basket with hanging ASPO placed in a sealed glass cell, which is poured 100 ml of the test composition. The static mode, the duration of dissolution (contact) - 3 hours, the temperature of the experiment in hours the basket with the remaining deposits are taken out and dried at a temperature not lower than the 28oC and not less than 24 hours. Find the mass of deposits after the experiment with a precision of 0 to 0.005, the removal Efficiency of sediment are calculated according to the formula, in wt.%: E = (G1- G2)/G1100, (%): where G1the weight of deposits taken for the experiment, g; G2the mass balance of deposits in the basket after the experiment, the higher the value of e, the more effective the inventive composition or the composition of the prototype.

The effectiveness of the composition of the prototype and the claimed composition was determined on samples of paraffin from oil wells, JSC "Tatneft". Group composition of the studied deposits are presented in table 5.

To assess the effectiveness of used laboratory technique described above. The results of determining the effectiveness of the proposed structure and composition of the prototype at ASPO (the difference in composition of the deposits are given in table.5) using different base solvents are presented in tables 6 and 7.

Example determine the effectiveness of the proposed composition for ARPD-1 to use as a hydrocarbon solvent R-1. The concentration of the additive in the hydrocarbon solvent was changed from 0.5 to 3.0 wt.% As the prototype used a homogeneous mixture consisting of a condensation product of Diethylenetriamine (butylcellosolve or BC) at different ratio of components in the mixture and the total concentration in the hydrocarbon solvent 5, 5,001, 10 and 15,001 wt.% (prototype). The contact time of 4 hours, the temperature of the experiment 30oC, the static mode.

Example determine the effectiveness of the proposed structure on the ASPO-2 to use as a hydrocarbon solvent P-2. The concentration of the additive in the hydrocarbon solvent was changed from 0.5 to 3.0 wt.% As the prototype used a homogeneous mixture consisting of condensation products of DETA and OK in a molar ratio of 1:2, neonols AF9-4or AF9-6+ BC, at different ratio of components in the mixture and the total concentration in the hydrocarbon solvent 3 and 15 wt.% (prototype). The contact time of 3 hours, the temperature of the experiment 20oWith the static mode.

Example determine the effectiveness of the proposed composition for ARPD-3 to use as a hydrocarbon solvent gasoline BR-2 according to GOST 443-76. The concentration of the additive in the hydrocarbon solvent was changed in the range of 0.5-3.0 wt.%. As the prototype used a homogeneous mixture consisting of condensation products of DETA and OK in a molar ratio of 1:1-1:2, neonols AF9-4or AF9-6+BC, at different ratio of components in the mixture and the total concentration in the hydrocarbon solvent is Example determine the effectiveness of the proposed composition for ARPD-3 to use as a hydrocarbon solvent gasoline BR-1 on THE other 38101303-72. The concentration of the additive in the hydrocarbon solvent was changed from 0.5 to 3.0 wt.%. As the prototype used a homogeneous mixture consisting of condensation products of Diethylenetriamine (DETA) and oleic acid (CA) in a molar ratio of 1:1, neonols AF9-4or a mixture AF9-6and BC, at different ratio of components in the mixture and the total concentration in the hydrocarbon solvent 5, 5,001, 10 and 15,001 wt.% (prototype). The contact time of 3 hours, the temperature of the experiment 30oC, the static mode.

Analysis of the results shows that the effectiveness of the proposed structure with the removal of sediment of different hydrocarbon composition (with a high content of paraffin waxes and asphaltene-resinous substances) (see tab.5) in pure form and in solution with etilbenzene, or isopropylbenzene, or butylbenzene fraction with a concentration of from 0.5 to 3.0 wt.% 1.2-1.4 times higher than that of the composition of the prototype.

1. The composition for removing asphaltene-maloperation sediments, comprising a hydrocarbon solvent and an additive, wherein the additive contains a mixture of 47.5-49,95 wt.% nitrogen blockcopolymers of ethylene oxide and of propylene oxide with a molecular mass of ~ 5000 and 47,5-49,95 the following ratio of components, wt. %: mixture of 47.5-49,95 wt.% nitrogen blockcopolymers of ethylene oxide and of propylene oxide with a molecular mass of ~ 5000 and 47,5-49,95 wt.% polyalkylbenzenes resin with 0.1 to 5.0 wt.% the polyglycols, in a mass ratio of 1: 1: 0,002-0,1 0,5-3,0; a hydrocarbon solvent else.

2. Composition under item 1, characterized in that the additive can be used in the form of a solution in alkylbenzene fraction, where the alkyl is isopropyl or ethyl, or butyl mass ratio of 1:1.

 

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