Composition for removing asphaltene-tar-paraffin deposits manifesting oil-field equipment corrosion inhibitory effect

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

 

The invention relates to the field of oil production, in particular, compositions for removal asphaltoresinparaffin deposits (ARPD), having the effect of inhibiting corrosion, and can be used to remove paraffin from the bottom-hole formation zone, flow lines, gathering collectors and oil field equipment oil-producing and oil-refining enterprises.

Known composition to remove asphaltoresinparaffin sediments containing aromatic solvent, a nonionic surfactant and sulfinol (RF Patent No. 2173328 C2, From 09 To 3/00). However, the known reagent is not effective enough.

Known composition for removing deposits containing, vol.%: aliphatic 25-85 and aromatic hydrocarbons - the rest; polar electrolit 2-5 and nonionic surfactant (nonionic surfactants) 1-2 (RF Patent No. 2165953 C1, From 09 To 3/00). Known composition is a multicomponent and not effective enough.

Closest to the proposed solution to the technical essence and the achieved effect is a composition for removing paraffin, having the effect of inhibiting corrosion of equipment, vol.%: aliphatic hydrocarbons 50-85; polar electrolit 2-5; nonionic surfactants 1-2; cationic surfactants 1-2; solvent - absorbent And-2 heavy 7-22; aromatic hydrocarbons - the rest (Patent of the Russian Federation is the 2183650 C1, C 09 K 3/00). However, the known composition is multicomponent and not effective enough.

The present invention is to create an efficient reagent for the removal of deposits, with the effect of inhibiting corrosion of oilfield equipment, consisting of affordable and accessible source components.

The problem is solved in that the composition for removing paraffin, having the effect of inhibiting corrosion of oilfield equipment containing nonionic surfactant (nonionic surfactants), cationic surfactant (cationic surfactant) and the solvent absorbent, as the nonionic surfactants contain a reagent, including oleic acid, alkyl phenol AF9-12or AF9-10N-alkyl-2-methyl-5-ethylpyridinium in a solvent; as a cationic surfactant contains the product of the interaction of a mixture of primary and secondary aliphatic amines with technical dimethylphosphite in a solvent in the following ratio of components,%:

The nonionic surfactants - 1-5

Cationic surfactant - 1-5

Absorbent-A - rest.

In an embodiment, the composition further comprises naphtha in the following ratio of components,%:

The nonionic surfactants - 1-5

Cationic surfactant - 1-5

Absorbent-And - 10-50

Straight-run gasoline - rest.

For the preparation of the claimed composition using the following reagents:

Cationic surfactant is a product in which aimogasta (PV-1) a mixture of primary and secondary aliphatic amines with technical dimethylphosphite, taken in a molar ratio of 1.0 to 1.2 0.1 to 1.0, respectively in the hydrocarbon solvent, which is obtained by mixing a source at a temperature of 50° With, then within 3-4 hours heated to 60-70° C. Receive a dense mass of light yellow to brown, which is then dissolved in a hydrocarbon solvent (U.S. Pat. Of the Russian Federation No. 2128729, 23 F 11/167, 1999). As aliphatic amines using fraction C8-C18or10-C14or C10-C16or8-C30. As the hydrocarbon solvent PV-1 may contain an aliphatic alcohol, nefras Ar 120/120 (TU 138-101809-80), Ar 130150 (GOST 10214-78), Ar 150/330 (TU 38-1011049-E), etilbenzene fraction (TU 6-01-1037-78), butylbenzene fraction (TU 38-10297-78), and their mixtures in various combinations. As the aliphatic alcohol PV-1 contains methyl (MC), ethyl (et), propyl (PS), isopropyl (IPA), butyl (BS), isobutyl (CHD) and other alcohols.

Example 1 obtaining PV-1. In chetyrehosnuju flask equipped with stirrer and dropping funnel, is placed 92 g technical dimethylphosphite and metered with stirring 200 g of amine fraction C8-C18containing 180 g of primary and 20 g of secondary amines, keeping the reaction temperature not higher than 50° C. the mixture is Then heated for 3-4 hours at a temperature of 60-70° With and dissolved in methanol.

Example 26 (see table 1). Carried out analogously to example 1, changing the original components and their number.

Table 1.
№ p/pThe molar ratio of amendmentsa in PV1The number of carbon atoms in alkylamineThe ratio of primary and secondary aminesThe ratio of PV-1:

the solvent, wt.%
11:1C8-C1898:230:70 MS
21:1With10-C1490:1030:70 es
31:1C10-C1680:2030:70 IPS
41:1C8-C3070:3050:50 toluene
51:0,8C8-C1898:250:50

nefras 120/120
61,2:0,8C8-C3050:5050:50 benzene

The nonionic surfactants - reagent comprising fatty acid, alkyl phenol type AF9-12or AF9-10N-alkyl-2-methyl-5-ethylpyridinium (APB) in a solvent (Patent RF №2140464, C 23 F 11/14, 1999).

As fatty acids take olein is a new acid according to THE 9145-012-00336444-96, GOST 7580-91; surfactant-type AF9-10or AF9-12or FBA-10, or FBA-12 take according to THE 2483-077-05766801-98; N-alkyl-2-methyl-5-ethylpyridinium in aliphatic alcohol, for example, methyl (MS), or isopropanol (IPA), or isobutyl (CHD) according to THE 39-1192-87.

As solvent a mixture of an aromatic solvent, for example: oil solvent (nefras, THE 10214-78), or a heavy oil solvent (nefras T, TU 38.101809-90); or a heavy oil solvent (nefras ARTICLE, THE 38.1011049-98); or diethylethanamine fraction of the production of cumene (DABF, THE 38.102144-90), or ethylbenzol fraction of the production of cumene in the alkylation of benzene by propylene (ABF, THE 6-01-010-37-78); or butylbenzene fraction of the production of cumene (BBF, THE 38.10297-78), and aliphatic solvent, for example: aliphatic alcohols - methyl (MS), or ethyl (ES), or isopropanol (IPA), or butyl (BS), or isobutyl (CHD) at a ratio of aliphatic and aromatic 1-2-5, respectively.

Get reagent (10 samples, see table 2) mixing the components at a temperature of 25-35° to obtain a homogeneous mass.

Table 2
No. sampleOleic acid The original components, wt.%
PAVAPBSolvent
aliphaticaromatic
110Neowolf9-12, 108ES, 20ABF, 25
212Neonol AF9-12, 208CHD, 20nefras T, 40
34Neonol AF9-10, 256ES, 13Nefras ARTICLE, 52
415Neonol FBA-10, 173BS, 20DABF, 45
520Neonol AF9-12, 255CHD, 15BBF, 35
614Neonol FBA-12, 126IPS, 17Nefras T 51
715Neonol FBA-10, 205MC, 10Nefras, 50
86Neonol AF9-12, 254ES, 15ABV, 50
910Neonol AF9-10, 1312IPS, 20Nefras T, 45
108Neonol AF9-12, 1715ES, 15ABV, 45

As a solvent of the claimed composition contains waste production of monomers for synthetic rubber, representing a combustible liquid saturated hydrocarbon aliphatic and aromatic series, in water, practically insoluble - absorbents grades: a-1, a-2, a-3, a-7 and a-8 (TU 38.103349-85).

1). Absorbent a-1 - transparent, without mechanical impurities liquid from light to dark color, density at 15° 0,75-0,90 g/cm3the boiling point of from 27 to 290° C.

2). Absorbent And-2 - the dark without mechanical impurities liquid density at 15° From 0.80-0.95 g/cm3the boiling point of from 65 to 370° C.

3). Absorbent And-3 - transparent without mechanical impurities liquid density at 15° 0,80-0,90 g/cm3the boiling point of from 40 to 250° C.

4). Absorbent And-7 - transparent without mechanical impurities liquid from light to dark color, density at 15° 0,75-0,90 g/cm3the boiling point of from 27 to 290° C.

5). Absorbent And-8 - liquid from brown to black color, density at 15° From 0.70 to 0.95 g/cm3the boiling point of from 25 to 380° C.

4. Naphtha charge according to THE 38.001256-76.

The claimed composition receive smartiepants and experience on the efficiency of destruction of the structure of deposits of the following structures:

 The composition of paraffin, wt.%
 asphaltenesresinwaxes
Sample 15,381,0642,41
Sample 20,415,33of 37.8

The removal efficiency of sediment declared reagent determine the gravimetric method (Effectiveness of solvents asphalt, resin and paraffin deposits in oil/Golovko, S., Shamray J.V., Gusev V., Lusin SF etc. - L., 1984. - 85 C. Review, inform. /VNIIEM. Ser. "Petroleum engineering").

Sample paraffin is heated to the softening temperature, thoroughly mixed and formed into the form of a cylinder 13× 16 mm. Then it is cooled and placed in a pre-weighted basket of brass mesh with cell size 1· 1 mm Size wafers 70· 15· 15 mm Weight of sample ASPO within 2.8 to 3.5,

A basket with a sample of sediment is weighed with an accuracy of ±0.005, a difference of weights of the basket of deposits and net baskets determine the initial mass of sediment (m0). Then a basket of deposits placed in a sealed glass cell, which is poured studied solvent composition with a volume of 100 ml Temperature exp is riment 30±0,5° C. after 3 hours the basket with the remaining intact part of ASPO removed and placed in a desiccator connected to a water vacuum pump. Produce drying of the sample ASPO at a residual pressure of 2-3 mm Hg to a constant weight.

According to the results of the experiment to determine the mass balance of deposits in the basket relative to the weight taken on the analysis of the original sample) and the difference determines the mass of a remote part of ASPO. The removal efficiency of sediment (ep) appreciate the difference between the amount of deposits taken for analysis (m0, g), and the balance of deposits in the basket (m, g) wt.% Ep=m0-m/m0·100%. The measurement error is 10%.

Examples of the preparation of the reagent

Example 1. In a flask with a capacity of 250 ml consistently pour in 1 ml PV-1 (nonionic surfactants), 1 ml of reagent (cationic surfactant), 10 ml straight-run gasoline and 88 ml of solvent A1. Carefully mix the mixture by stirring until complete dissolution of the ingredients. The resulting solution is a liquid from light yellow to brown.

Examples 2-23. Prepared analogously to example 1 by changing the quantitative ratio of the components. Information on examples 1-23, the results of tests of the effectiveness of the destruction of the ARPD and data on the prototype are summarized in table 3.

Presented in the table 3 data shows that the claimed when becoming to remove paraffin, with the effect of inhibiting corrosion of oilfield equipment, is effective and is prepared using readily available and inexpensive components.

Table 3.
№ p/pComposition, vol.%The corrosion rate mg / HRThe efficiency of destruction of deposits,%
PV1 (cationic surfactant)Reagent (nonionic surfactants)Absorbent-Sample 1Sample 2
# example from table. 1.Concentration,% vol.# example from table. 2.Concentration,% vol.Straight-run gasoline, vol.%markConcentration,% vol.
1113110A1880,0002499,097,5
21121-A1980,0002698,598,0
3315120A1 98,597,0
4411150A248 97,097,0
55122-A397 98,598,5
6614220A7770,0002796,097,5
71195-A194 97,097,0
82281-A897 96,597,0
932102-A2960,00030100,099,0
10421220A176 96,097,5
11/td> 5224-A394 96,097,0
12623420A274 97,598,0
131245-A793 97,597,5
142321-A896 96,598,0
153363-A194 99,598,0
16437320A374 100,099,0
175315-A1920,0002097,0100,0
186335- A792 97,597,0
191561-A194 97,097,0
202572-A393 98,096,0
213585-A890 99,598,5
224510510A280 99,098,0
23552520A2700,0002599,599,0
24the placeholder0,0004396,594,0

1. The composition for removing asphaltoresinparaffin deposits, having the effect of inhibiting corrosion of oilfield equipment containing nonionic surfactant, nonionic surfactants, casinoenligneroulette-active agents cationic surfactant and the solvent absorbent, characterized in that the nonionic surfactants it contains a reagent, including oleic acid, alkyl phenol AF9-12or AF9-10N-alkyl-2-methyl-5-ethylpyridinium in a solvent; as a cationic surfactant, it contains the product of the interaction of a mixture of primary and secondary aliphatic amines with technical dimethylphosphite in a solvent in the following ratio of components,%:

The nonionic surfactants 1 - 5

Cationic surfactant 1 - 5

Absorbent-And the Rest

2. The composition according to claim 1, characterized in that it additionally contains naphtha in the following ratio of components,%:

The nonionic surfactants 1 - 5

Cationic surfactant 1 - 5

Absorbent-And 10 - 50

Straight-run gasoline Else



 

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