Composition for removal of oil deposits

 

(57) Abstract:

The invention relates to oil and other industries associated with the production, transport and storage of oil (condensate), and can be used to remove and prevent asphalt, resin and paraffin deposits (ARPD) in wells, oilfield equipment and the bottomhole formation zone. Composition for removal of oil deposits contains an aromatic solvent, a nonionic surfactant OP-7 or OP-10, anionic surfactant (sulfonic acid) in the ratio of OP-7 or OP-10 as of 1:3.5 in the following ratio, wt. %: OP-7 or OP-10 - 16-35, the sulfonic acid - 4,5-10,3, aromatic solvent else. The aromatic solvent used heavy fraction of aromatic hydrocarbons with installation reforming. The technical result - the creation of a composition for the removal and prevention of oil deposits with low content of resins and asphaltenes from inexpensive and available chemicals. 2 C.p. f-crystals, 1 table.

The invention relates to oil and other industries associated with the production, transport and storage of the nave is(ASPO) in wells, oilfield equipment and bottom-hole formation zone.

Known composition, comprising a mixture of a water-soluble block copolymer on the basis of monoethanolamine and the oil-soluble propoxylate and aromatic solvent (AV. mon. N 1203098, CL 09 To 3/00, E 21 In 37/00, 1986).

The disadvantage of this structure is a high dosage when it is used as an inhibitor and heated to 40-90oC when used as an inhibitor of deposits.

Known composition containing surfactant (previal NGE 10/16 or deproxin - 157), kantapat -912 and aromatic solvent (ed. mon. N 1813778, Ál. From 09 To 3/00, E 21 In 37/00, 1993).

The disadvantage of this structure is the high cost and scarcity of chemicals included in the composition.

Closest to the proposed invention, taken as a prototype, is a composition to prevent paraffin deposits in oil field equipment, described in the patent N 2039071, IPC 09 To 3/00, 1995, containing, by weight. %:

Silciliani surfactant - 10-40

Postit - 1-3

Aromatic solvent - Rest

However, this composition is not a high removal efficiency and predotvrasheniye oil with a viscosity of more than 20 mm2/s with a density of more than 0,895 g/cm3and a significant content of resins and asphaltenes, does not form deposits, even if they are highly paraffinic. Conversely, the lighter the oil and netcommunity with a high content of light fractions and a viscosity below 20 mm2/to form deposits. Comparing both types with roughly the same content of paraffins, we can conclude that the resins and asphaltenes inhibit the process of ARPD.

The objective of the invention is to provide a composition for removing and preventing deposits, effective for paraffin oils and NetConnection with low content of resins and asphaltenes, which includes not expensive and available chemicals.

The task is to remove oil deposits is solved in that the composition containing an aromatic solvent and a nonionic surfactant (OP-7 or OP-10), impose additional anionic surfactant (sulfonic acid) in the ratio of OP-7 or OP-10 as of 1:3.5 in the following ratio, wt. %.

OP-7 or OP-10 - 16-35

The sulfonic acid - 4,5-10,3

Aromatic solvent - Rest

Set sidecarisoprodol with installation reforming (a byproduct of making gasoline from gas condensate) Sosnogorsk gas processing plant (SGPS), The Republic Of Komi.

Molecular weight of 159,3

Density, S420g/cm3< / BR>
The viscosity, V20mm2/s - 2,6

TemperatureoC:

boiling - 215-266

pour - 64

turbidity - 52

Acidity, mg KOH/100 cm3- 0,087

Color - Light brown

To improve the efficiency of the removal and prevention of deposits in the composition is introduced a mixture of nonionic and anionic surfactants.

The choice of the mixture of surfactants is based on the determination of the critical micellization concentrations (CMC) of the investigated surfactants, which are known to correspond to the maximum of their surface activity and are accompanied by a sharp change in surface tension, density, foaming and detergent capacity and other properties. The largest difference CMC have sulfonic acid and OP-7 (10), i.e. in this case one should expect a synergistic effect.

When the ratio of sulfonic acid (TU 6-01-1001-73) and OP-7 (GOST 8433-81) or OP-10 (GOST 8244-81) - 1:3,5 this mixture of surfactants exhibits synergistic in nature, it washes ability is higher than each individually.

This is a very important factor for improving the efficiency of the removal and prevention asfaltosmesiteli the installation reforming and mix (PL. experience 5).

Example N 2

To 8 g of the sulfonic acid type 25 g of OP-10 and stirred, then added with stirring 17 g of ethanol and 50 g of heavy fractions of aromatic hydrocarbons with installation reforming (PL. experience 10).

Example N 3

To 9.5 g of the sulfonic acid type of 32.5 g SP-10 and mix, then add 58 g heavy fraction of aromatic hydrocarbons with installation reforming and again mix (PL. experience 9).

The resulting composition was tested for efficacy using methods developed in the NGO Soyusneftepromhim" (Methodology. Evaluation of the effectiveness of inhibitors and paraffin deposition of complex or multiphase washing steps on the oil film, dispersion, and washing the paraffin reservoir water) hydrocarbon liquids Aginskogo and Pechora-Kovenskogo fields.

The ratio of paraffins, resins and asphaltenes:

Ugid - 1:0,24:0,01

P-cogwa - 1:0,41:0.04

The test results of the composition for removal of oil deposits, are presented in the table showed that the proposed structure has the best performance laundering properties in comparison with the prototype and is not inferior in efficacy to the widely inhibitor SV series SPNH (table).

The use of this composition will increase the turnaround time of wells and reduce operational costs of developing oil and gas condensate fields.

1. Composition for removal of oil deposits containing aromatic solvent and a nonionic surfactant, wherein the composition further comprises a sulfonic acid, as well as non-ionic surfactants contains OP-7 or OP-10 in a ratio of components, wt.%:

OP-7 or OP-10 - 16 - 35

The sulfonic acid - 4,5 - 10,3

Aromatic solvent - Rest

2. The composition according to p. 1, characterized in that the aromatic solvent used heavy fraction of aromatic hydrocarbons with installation reforming.

3. The composition according to p. 1, wherein the ratio of sulfonic acid to OP-7 or OP-10 is 1 : 3,5.

 

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Deicing composition // 2167180
The invention relates to chemical industry

FIELD: soft abrasive materials based on mixed aluminum and iron oxides.

SUBSTANCE: method includes blending of raw components and subsequent heat treatment. Solutions of aluminum and iron sulfate with ammonia bicarbonate admixture heated to 40-600C are used as raw materials to produce slurry of aluminum and iron bicarbonates. Precipitate is separated by filtration, washed and dried. Heat treatment is carried out at 1150-12000C to provide solid solution expressed by general formula Al2-xFexO3, wherein x = 0.30-0.37. Mass part of iron oxide in finished product is 20-25 mass %. Abrasive materials of present invention are useful for finished polishing of metal parts, have polishing ability of 0.37-0.40 mg/min.cm2, provide roughness RZ = 0.07-0.08 mum after polishing and 85-90 %-yield of high-precision accepted metal parts.

EFFECT: environmentally friendly abrasive materials of improved quality.

1 cl, 3 ex, 1 dwg

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