RU1623278C - Surface-active composition for intensification of oil recovery - Google Patents

Description

(46) 10/15/92. Rule. N 38

(21) 4487765/03 h

(22) 09/28/88

(72) V.G. Germashev, N.A. Kononova, M.I. Rud, V.M. Slyunin, V.G. Pravdin, E.V. Feoktistova, T.N. Nezhurina, M.S. Yanshp Nnikova, T.V. Raevska, P.P. Guziev, V.N. Ivanov, A.T. Gorbunov, L.N. Buchenkov, V.G. Oganzhan nts, G.A. Badal nts, R.G. Mukhametz nov, V.I. Khramov, I.P. Korolev and V.P. Gorodkov (53) 622.276 (088.8) (36) USSR Copyright Certificate 1538087, cl. Ј 2 V 43/22, 38-92 - (54) SURFACE-ACTIVE COMPOSITION FOR INTENSIFICATION OF OIL PRODUCTION OIL TENOL-N

(57) The invention relates to an oil industry and is intended for treating a bottom hole of a well. The goal is to increase the effectiveness of the compositions by limiting the influx of water and stimulating the influx of oil in production wells. The composition is co

The invention relates to the oil industry, and in particular to compositions for treating the bottom-hole zone of production and injection wells.

The aim of the invention is to increase the efficiency of limiting the flow of water and stimulating the flow of oil in the production of other wells.

To this end, in a composition comprising anionic, non-yoyoine steam and hydrocarbon shuttles, as

holds the following components in their ratio, wt.%: acirnoy surfactant (AAS) 15-60, nonionogenic surfactant (AAS) 20-70, hydrocarbon 1-20, water - the rest. A mixture of water-soluble petroleum sulfonates contained in acidic fluids of sulfuric acid purification and sulfoethoxylates with a degree of (o C) xylethylation of 3-5 with a mass ratio of 1: 5 to 1:15 is used as an ACS. As a nonionic surfactant, sparingly soluble oxetheliropic alkylphenol with a degree of hydroxyethylation of 3-5 is used. The composition is prepared by mixing acid tar. With nonionic surfactant for 1 h at 70-90 ° C. Then the mixture is neutralized with alkali or ammonia at 30-40 ° C to pH 7-3. The use of the composition will reduce water permeability by 3.8 times, increase oil permeability by 2.5 times and additionally produce 200 g of oil per 1 ton of active base. 2 tab.

of the anionic component (ACAS) use a mixture of water-soluble oil sulphates of 4 onates contained in acidic oils of sulfuric oil refining and alkyl phenyl sulfoethoxylates with an oxidation degree of 3-5 (SEAF9-4) with a mass ratio of 1: 5 - 1:15 and, as a nonionic component (iflLAB), it is an oil-soluble, hydroxyblocked alkyl phenol with a degree of hydroxyethylation of J-5 (isonol AF9-4 or Off-) when followed. nip of cattle puppies komponentgo, N.IC. (L

CD No. СО Ю 1 00

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 JIM (petroleum. Pho - nl g m g / TFO ethoxylate) 1V-6 (i nonionic surfactants (nsopol LF9-4 or OP-4) 20-70

hydrocarbon boring agent 1-20

Water.Other

The composition is obtained by mixing acid tar with neonope AF9-4 at 70-90 ° C for 1 hour. In this case, partial sulfonation of neomol AF9-4 with the formation of sulfPetoxylates - SEAF9-4 takes place. Then the resulting .. surfactant mixture is neutralized with alkali or ammonia to a pH of 7-8 at 30-40 C.

15 acidic tar contained, May.%: Neftic sulfonic acids 14-28

Sulfuric acid 30-70

Organic Part 15-32

The composition of the composition also includes sodium, ammonium or ammonium phosphate as a chemical impurity, which is formed upon the introduction of a surfactant mixture upon neutralization / 1 and does not affect the performance properties.

The essence of the invention lies in the fact that a hydrocarbon solution of a surfactant composition of a given composition mixes indefinitely with oil and, penetrating into the zones filled with oil, dissolves the organic effluents formed in them. As a result, the oil permeability of the zone increases. At the same time, these surfactants in a hydrocarbon solution ensure the formation water is likewise with the further formation of one-oil emulsions in areas filled with milking. This leads, on the one hand, to dehydration -

bottomhole formation zone and

40

45

deeper penetration of the resulting microemulsions and, as macroemulsions form, to a decrease in the filterability of the aqueous phase with the transition to predominantly filterable oil in oil-saturated regions of the reservoir zones.

Oil sulfonates contained in acidic tars of sulfuric acid refining of oils are used in this composition to reduce the interfacial tension at the water-oil interface as dispersants of asphalt-resinous and paraffinic deposits, but it is not practical to use them separately since the separated oil sulfones you are a hydrophilic component and are not soluble in hydrocarbon

In contrast to water-soluble anionic surfactants, neonol AF9-4 or OP-4 ll, -50

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“Mychlororgl is the norm component. The involvement of the RGL gene in the main com- pound allows regulating the hydrophilic-pipophilic balance of the system with the chain of achieving ultra-low interfacial tension and increasing the solubilizing property of the hydrocarbon p. a solution of the composition, which ensures the solubility of the pigment composition in a hydrocarbon solvent.

The use of a hydrocarbon solution only with AF9-4 (OP-4) neofield for treating near-well zones of oil wells is not effective, since AF9-4 neonol does not reduce the interfacial tension at the oil-water interface to ultralow values, as a result of which it does not form microemulsion phase and there is no solubilization of formation water. The formation of macroemulsions upon contact of a Neopol AF9-4 hydrocarbon solution with produced water makes it difficult to push it deep into the formation and reduces the permeability of the formation both in water and in oil. In addition, Neonol AF9-4 does not have high washing properties of paraffin-tar deposits and is limited by the temperature conditions of use, since its cloud point is below 25 ° C. At higher temperatures, Neonol AF9-4 dehydrates and loses its surface-active properties.

The introduction of SEAF9-4 into the composition increases the stability of hydrocarbon solutions of the composition, its compatibility with formation waters, application temperature up to 100 ° C and solubilizing properties.

The presence of a hydrocarbon in the composition gives it fluidity and helps to stabilize it. Included in the composition of the water is formed as a result of the reaction upon receipt of the composition.

Boundary values of the optimal ratios of the components in the composition are determined by the stability of hydrocarbon solutions and by their co-ability.

For this purpose, 5 g weighed compositions of 100 g per 100% active base are placed in 100 ml cylinders with a ground stopper, mixed with 100 ml of hydrocarbon (kertsin 1.0-25) and incubated for 1 day. The test results are shown in table 1. The solutions are tested for the solubilizing ability t determined by the titropgme of the water phase of the mixture with thorough mixing until a cloudy system. At the cloud point, the solubilization parameter is calculated as the ratio of the volume of saline water to the volume of surfactant in the hydrocarbon solution (VB / Vnfle). The titration is carried out at 2 (i + 2 ° C), and then, upon reaching the maximum solubilization (cloud point), the solutions are kept at L0 + L ° C.

The composition of the composition within the boundary ratios is stable for 1C day.

The properties of this composition for enhancing oil production depend mainly on the ratio of the surface-active components (ACAS and IPAS) in it. Hydrocarbon and water, the content of which in the composition depends on the composition of the tars used and the technology for preparing the composition, have practically no effect on the solubilizing properties of the composition.

The solubility parameter of the composition within the boundary ratios of the components is 1.5-2.5 times higher than that of the prototype.

The compositions of the surface-active composition with the identified boundary values are checked by their technological effectiveness: permeability of the formation model by type and oil before and after treatment with the hydrocarbon solution of the composition according to the following methods.

To determine the permeability of the formation model by water, the bulk model of the formation, represented by quartz sand-and-sand, with a length of 0.4 m and a diameter of 0.012 m, is saturated with a model of formation water, then oil is aged for 3 days at a temperature of the formation of 70 + 5 ° C. Water is then pumped and the water permeability of the model is determined. A hydrocarbon solution of the test composition composition is ready and introduced into the reservoir model in an amount of 20% of the pore volume. Then, the injected water model is again pumped and the water permeability of the model is determined.

To determine the permeability of the formation model by oil, a bulk model of the formation represented by silica sand of 0.4 m length and. with a diameter of 0.012 m is saturated with a model of produced water, then with oil, and the oil permeability of the model is determined. A hydrocarbon solution of the test composition is prepared and introduced into the model.

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formation n in an amount of 20% of pop. Then, oil was again mulled and the oil permeability of the model was determined.

Examples, 5 kg of the composition (5% based on n, h 100% active base) of the corresponding composition according to the invention is dissolved in light oil and tested according to the above methods. The results are shown in table 1 (examples 1-7 and 10-12),

According to the prototype, a mixture of 9 g of alkylbeneolsulfonate (9 wt.% Calculated on a 100% active basis) and 1 g (1 wt.%) Of OP-10 are dissolved in light oil and tested according to the indicated methods (see table. 1, example 13).

Table 1 shows that the composition reduces the water permeability of the reservoir model due to the formation of emulsions in water-saturated pores and increases oil permeability due to the formation of microemulsion systems at the water-oil-PAA interface, which reduce interfacial tension and penetrate hydrocarbon channels (see , table 1, L examples 1-6).

The decrease in the surfactant content in the composition below the boundary values does not significantly reduce water permeability and does not increase oil permeability, since such a composition does not solubilize formation water (see table 1, example 7J or does not give stable hydrocarbon solutions even when injected delaminates (see table 1, example 9).

Increasing the concentration of surfactants above the boundary values leads either to unstable hydrocarbon solutions (see table 1, example 8), or inefficient (see table 1, example 10).

Compared with the prototype, the solubilizing ability of the optimal composition increases 2.5 times. Accordingly, the permeability: reservoir model water decreases by 3.8 times (when using the prototype composition by 2.4 times) and oil permeability increases by 2.5 times (for the prototype by 1-5 times).

To determine the maximum salinity of the formation water at which the effectiveness of the bottomhole treatment by this composition is maintained, it is tested on the formation model at different values of the salinity of the water (see table 2, examples 1417). the composition can be used for the mineralization of sludge water up to 100 kg / m3.

The use of the composition allows an additional production of 200 tons of non-oil per 1 ton of active base.

Claims (1)

The claims A surfactant composition for enhancing oil production, including anionic surfactant (AAS), nonionic surfactant (NSAID), hydrocarbon solution & water and water, which is delayed in order to increase the efficiency of the composites by limiting the influx of water and stimulating the influx of oil in producing wells as ANLZ, the composition contains a mixture of alkylpepolone sulfonates with a degree of ethoxylated 3-5 (SEAF9-4) and sulfuric acid refining contained in acidic tars Asel-soluble petroleum sulfonates (VIS) at a weight ratio of 5: 1 - 15: 1, and p as a nonionic surfactant - maslorast- Orim oxyethylated alkylphenol having a degree of ethoxylation of 3-5 with the following ratio of components,% .mae:. A mixture of SEAF9-A and ANS at a weight ratio of 5: 1 - 15: 115-60 Oil-soluble hydroxyethylated alkyl phenol with a degree of hydroxyethylation 3-5 20-70 Hydrocarbon solvent 1-20 Water Else  .t “r p i c t 1 Bright, PROPERTIES M activity of composition I1AB intvsifimtsi vovyad Examples of testing a hydrocarbon solution of a surface-active composition (see .1, example 6) in the treatment of oil reservoirs with different mineralization 36 65 100 110 1.78 1.83 1.64 1.72 1623278 K) Table 2 0.67 0.62 0.63 0.66 1.68 1.70 M7 0.71