RU2681532C1 - Demulsifier - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: present invention relates to the field of oil preparation. Demulsifier is described for dehydration and desalting of oil emulsions containing the first mixture and the second mixture mixed with each other at the following ratio: the first mixture is 24.5–29.5 wt%, the second mixture is the rest, first mixture contains 12.5–17.5 wt% modified polymer alkoxylate, representing Kemelix D 510, 12.5–17.5 wt% solution of ethoxylated phenolic resin in an aromatic solvent, representing Kemelix D 304, and solvent methanol – the rest, second mixture contains 8.5–13.5 wt% block copolymer of ethylene oxide and propylene, representing Lapromol 294, 29.5–35.5 wt% solution of the modified polyol in the system of aromatic solvents, representing Reapon 18U or Reapon 16T, 28.4–33.5 wt% solution in toluene of the product obtained by the alcoholate polymerization of alkylene oxides on condensed alkylphenol, which represents Reapon 3T, and the balance is an organic solvent and methanol in the ratio of 1/10.EFFECT: deep dehydration of the oil emulsion, while cleaning the released water from oil products, reducing corrosion, reducing the formation of asphalt-resin-paraffin deposits.1 cl, 6 tbl, 3 ex

Description

The invention relates to the field of oil preparation and can be used in the oil and gas production and oil refining industries in the processes of dehydration of oil emulsions during their preparation for refining both when fed to the oil recovery system and in oil treatment plants for deep dehydration of oil emulsions, and can also be used in other industries for the separation of water-oil emulsions.

Known Composition for the destruction of oil-water emulsions and wastewater treatment, having the effect of inhibiting hydrogen sulfide, carbon dioxide corrosion and asphaltene-resin-paraffin deposits, containing the first mixture comprising a block copolymer, and a second mixture comprising a solvent (RF Patent No. 2213123, C10G 33/04, Op. September 27, 2002).

The disadvantage of the above technical solution is that it does not provide deep dehydration of oil emulsions, during which the emitted water (produced water) is purified from oil products, and also does not have the universality of application for water-oil emulsions of light, medium, heavy oils.

The closest technical solution is the Composition for dehydration and desalination of oil (options) containing the first mixture comprising a block copolymer, and the second mixture comprising resin and methanol (RF Patent No. 2305124, C10G 33/04, C08G 18/48 op. 27.08 .2007, prototype).

The disadvantage of the above technical solution is that it does not provide deep dehydration of oil emulsions, during which the emitted water (produced water) is purified from oil products, and also does not have universality of use for water-oil emulsions of light, medium, heavy oils: it does not have inhibitory properties AFS, which does not prevent the formation of an intermediate layer in the oil preparation process, which is a highly stable oil-water emulsion that slows down process of separating water from oil, in addition has no inhibitory properties against corrosion of oilfield equipment.

The proposed technical solution eliminates the above disadvantages and improves the properties of the demulsifier due to the integrated action providing deep dehydration of oil emulsions, while purifying the released water (produced water) from oil products and at the same time protecting the oil collection, transport and treatment systems against corrosion by reducing corrosion , reducing the formation of asphalt-resin-paraffin deposits (paraffin) and desalting of oil emulsions, while economically beneficial, while Demulg the torus contains a first mixture comprising a resin and a solvent methanol, and as a resin it contains a solution of ethoxylated phenolic resin in an aromatic solvent, and a second mixture comprising a block copolymer, and as a block copolymer it contains a block copolymer of ethylene and propylene oxides, the first mixture further comprises a modified polymer alkoxylate, in the following ratio of components, (mass%):

modified polymer alkoxylate - 12.5-17.5;

a solution of ethoxylated phenolic resin in an aromatic solvent - 12.5-17.5;

methanol solvent - the rest,

and the second mixture further comprises

a solution of the modified polyol in a system of aromatic solvents, a solution in toluene of a product obtained by alcoholate polymerization of alkylene oxides on condensed alkyl phenol, and a mixture of an organic solvent and methanol in a ratio of 1/10 in the following ratio of components, (mass%):

block copolymer of ethylene oxide and propylene - 8.5-13.5;

a solution of the modified polyol in the system of aromatic solvents - 29.5-35.5;

a solution in toluene of a product obtained by alcoholate polymerization of alkylene oxides on condensed alkyl phenol — 28.4-33.5;

a mixture of organic solvent and methanol in a ratio of 1/10 - the rest,

while the first and second mixtures are mixed with each other, in the following ratio (mass%):

the first mixture is 24.5-29.5 and the second mixture is the rest.

Tests of the demulsifying activity of the claimed compositions of the technical solution "Demulsifier": dehydration of oil emulsions by separating water (produced water) from an oil-water emulsion was tested in laboratory conditions (table 1) and at oil treatment facilities (table 2).

The claimed technical solution The demulsifier is a Tyumen oil demulsifier (TND), the composition of which showed a complex effect: dehydrates oil, desalts oil emulsions, purifies water from oil products extracted from the oil emulsion, reduces corrosion and reduces the formation of asphalt-resin-paraffin deposits (ASA) (hereinafter referred to as - "Demulsifier TND").

The demulsifier TND in the process of testing showed a deep dehydration of oil emulsions while simultaneously purifying the released water (produced water) from oil products, in addition, the following properties were revealed:

corrosion protection of oil collection, transport and treatment systems, thereby reducing the corrosion process,

protection against the formation of asphalt-resin-paraffin deposits (paraffin), thereby reducing the formation of the process of paraffin,

and desalting of oil emulsions.

At the same time, the ability of the declared TNT demulsifier to exhibit the properties of an ASPO inhibitor in the process of dehydration of oil emulsions allows preventing the formation of highly stable emulsion layers, which reduce the efficiency of oil and water separation,

According to the report IOFH them. Arbuzova, Kazan, in the RVS-5000 of the Kichuy UPVSN NGDU “Elkhovneft” in the process of oil preparation, an intermediate layer that is not destroyed by the demulsifier used (Reapon IK-1 m) is gradually accumulated, which is a highly stable, gel-like water-oil emulsion stabilized with solid particles of FeS excess amount of demulsifier.

It was found that with the well-known demulsifier Reapon IR-1 m at the oil-water interface, a solid-like intermediate layer is formed in the tank even at a dosage of 100 g / t of oil. It is this layer that gradually accumulates in the RVS-5000, creating problems for oil preparation at the Kichuy UPVSN in the NGDU “Elkhovneft”.

The fundamental difference between the declared TND demulsifier, compared with the well-known Reapon IR-1 m, is that the TND demulsifier provides an almost complete absence of this layer up to a dosage of 60 g / t of oil, as shown by the study conducted on the example of a natural emulsion of well No. 272, in which the possibility of eliminating the intermediate layers by replacing the used known demulsifier with the declared demulsifier TND. (“Report on the results of laboratory tests of the demulsifier TND at the facilities of NGDU Elkhovneft”, LLC “Proton-oil-technology”, LLC “New Technologies”, RF, Republic of Tatarstan, Almetyevsk, 2015)

A similar result was obtained during laboratory tests in the HAL of KMK Munai JSC (Kazakhstan, Aktobe). After the exposure of the well-known base reagent Randem to a mixture of oil emulsion with three NM (Kumsay, Kokzhide and Mortuk), an intermediate layer forms at the oil-water interface, and a large content of oil products is observed in the water part. In turn, the declared demulsifier TND allowed to completely separate oil and water without an intermediate layer and purify water from oil products. At the same time, the dosage of the declared demulsifier TND is reduced to 120 g / t of oil, the temperature of the preparation is up to 65 ° C (in the field, when preparing the oil, 150 g / t of oil and 75 ° C are used, respectively). (“Report on the results of laboratory tests of the demulsifier TND at the facility“ KMK Munai ”, LLC“ New Technologies ”, Republic of Kazakhstan, Aktobe, 2017)

At UPN NM Karazhanbas, the well-known demulsifier Randem 2208 is used at a temperature of heating the emulsion to 93 ° C with a flow rate of 220 g / t of oil.

In laboratory tests of the declared demulsifier TND in HAL at UPN NM Karazhanbas (Karazhanbasmunay LLP, Kazakhstan, Aktau)

the separation of oil and water was carried out without the formation of an intermediate layer at a dosage of 180 g / t of oil and a temperature of heating the emulsion to 85 ° C. Moreover, the water content in the purified oil is 0.03%. The base known demulsifier did not provide this: the water content in oil is 0.3%, an intermediate layer is observed.

In addition, the claimed demulsifier TND has the properties of a scale inhibitor, which is confirmed by a decrease in salts after its exposure from 27,400 mg / L to 170 mg / L. (“Report on the results of laboratory tests of the demulsifier TND and scale inhibitors on oil-water emulsions of the Karazhanbas field”, LLC “New Technologies”, Republic of Kazakhstan, Aktau, 2017)

The ability of the claimed demulsifier TND to exhibit the properties of a corrosion inhibitor was tested in laboratory conditions in comparison with the known inhibitor KO-101.

At the facilities of JSC “SNPS Aktobemunaigas” a well-known corrosion inhibitor KO-101 is used.

The value of corrosion of identical sized polished steel samples made from one steel bar (steel ST-3) was estimated by the gravimetric method from the change in the mass of the samples before and after corrosion. Aqueous solutions of the studied reagents with two concentrations of 20 mg / L and 40 mg / L were prepared using real produced water with a high content of hydrogen sulfide provided to us. All vessels with prepared solutions and polished steel samples placed in them were mounted on a shaker that rotationally rotated at a speed of 200 vibrations per minute and at the same time heated the solutions to 45 ° C (typical temperature of produced water during oil preparation).

Under these conditions, the corrosion rate of steel samples was very noticeable. As a result, after 10 hours, when the corrosion value was estimated, the weight changes of the samples ranged from 20 mg to 55 mg, which was recorded by an analytical balance with an accuracy of ± 0.2 mg (the corrosion products were removed from the surface of the samples before measuring the mass with a special reagent - a rust converter ) The effectiveness of the studied reagents as a corrosion inhibitor was evaluated by the ratio of the value of corrosion per unit surface area of a steel sample in the solution of this reagent (K) and without reagent (K ₀ ).

A comparison of the found values of K / K ₀ for the studied reagents is presented in table 3.

According to the data obtained (Table 3), the studied reagents reduce the corrosion rate of steel to one degree or another, and the claimed demulsifier TND not only showed the properties of a corrosion inhibitor, but also worked better than the well-known corrosion inhibitor KO-101.

In solutions of all the studied reagents, with increasing concentration, the value of corrosion increases. This is due to an increase in the particle size of the reagents in the form of which they are adsorbed on the metal surface. The larger the size of these particles, the greater the gaps between them, contributing to pitting corrosion - the main cause of pipeline ruptures. (“Report on the results of laboratory tests of the demulsifier TND on oil-water emulsions of the Zhanazhol, Kenkiyak and Severnaya Truva fields of JSC“ SNPS Aktobemunaigas ”. LLC“ Proton-oil-technology ”, LLC“ New Technologies ”, Kazakhstan, Aktobe, Russian Federation, city of Tyumen, 2015)

When preparing oil at the Zhanatalab field, the requirements for the content of salts in salable oil are additionally imposed on the used demulsifier: the concentration of chloride salts in dehydrated and degassed oil should be no more than 80 mg / l.

As a result of pilot tests, the declared demulsifier TND, in comparison with the well-known base demulsifier SNPCH-4460, showed high efficiency at a rate of 65.8 g / ton of oil and ensured the required quality of commercial oil (table 4).

Thus, the claimed demulsifier TND showed that it has the properties of a scale inhibitor. (“Act on pilot testing of the demulsifier TND (grade B) at the facilities of the Zhanatalap VK deposit POTENTIAL Oil LLP. New Technologies LLC, Kazakhstan, Atyrau, 2017)

The ability of the demulsifier TND to reduce the deposition of paraffin is confirmed by testing in comparison with the known FLEK D-012.

At the oil treatment facilities of OAO GPN-Noyabrsneftegaz, the water content in the crude oil was measured in two independent ways: by the Dean-Stark laboratory method and by continuous readings of the moisture meter. The difference between the readings of the hygrometer and the laboratory data was due to clogging of its sensor with polar AFS products within 1-2 hours after cleaning. During pilot tests (hereinafter referred to as “OPI”) of the TNT demulsifier, this process sharply decreased.

The ability of the demulsifier TND to reduce the deposition of paraffin during the OPI was manifested in a decrease in the differences between the values of water cut, determined by laboratory data and a moisture meter due to the reduction of its clogging by particles of paraffin. Moreover, this effect was manifested during field trials at the Vyngapurovskoye, Sredne-Iturskoye and Sporyshevskoye fields (table 5).

The repetition of this effect in several fields with different oil confirms the results of laboratory studies on the ability of the demulsifier TND to reduce the deposition of paraffin. ("Report on the performance of work on testing the demulsifier TND experimental-industrial method on the CSN-1 and CSN-2 Vyngapurovsky, CSN with UPSV Sredne-Itursky, CSN with UPSV Sporyshevsky fields of OAO Gazpromneft-Noyabrskneftegaz. Proton-oil-technology LLC ", Noyabrsk, 2013).

During the preparation of heavy oil of the supra-salt horizon of the Kenkiyak oil field (operator: Aktobemunaigas SNPS JSC), deposits of asphalt-containing hydrocarbons and paraffins are present, which complicate oil refining.

The oil samples were tested for the effectiveness of the declared demulsifier TND and the known reagents Ranras-6001, KL-99, KL-6555 used in the field, in particular at the CPPC field Kenkiyak.

Using a Zetatrac laser analyzer, it was found on an oil sample that the high molecular weight compounds in it are predominantly in the form of very large particles with sizes greater than 6000 nm (6 μm). The possibility of precipitation of these particles into the sediment can be reduced only by reducing their size, i.e. translate them into a dissolved state in the dispersion medium of a given oil. This can be achieved, for example, by heating oil. It was found that after heating a sample of the test oil at 80 ° C for 6.5 hours, its particle size can indeed decrease to 2440 nm. But with such a high-temperature and prolonged heating of oil, a significant loss of light oil fractions will occur, since this temperature is higher than the normal boiling point for hexane (68 ° C) and almost equal for benzene (80.2 ° C).

Another way to reduce oil particles is to introduce solvents and paraffin inhibitors into it. In order to study the effectiveness in this quality, the well-known reagents Ranras-6001, KL-99, KL-6555, as well as the declared demulsifier TND, were tested, they were introduced into identical oil samples poured into small tubes at the rate of 200 g / t of oil. The tubes were sealed with a stopper and shaken vigorously to distribute the reagents over the volume of oil. 6 hours after the reagents were introduced into the oil, the particle sizes were measured using Zetatrac. The experimental results are presented in table 6.

This experiment confirms that the claimed demulsifier TND has the properties of an inhibitor of paraffin. (“Report on the results of laboratory tests of the demulsifier TND on oil-water emulsions of the Zhanazhol, Kenkiyak and Severnaya Truva fields of JSC“ SNPS Aktobemunaigas ”. LLC“ Proton-oil-technology ”, LLC“ New Technologies ”, Kazakhstan, Aktobe, Russian Federation, city of Tyumen, 2015)

During the preparation of heavy oil of the supra-salt horizon of the Kenkiyak oil field (operator: Aktobemunaigas SNPS JSC), deposits of asphalt-containing hydrocarbons and paraffins are present, which not only complicate the refining of oil, but also contribute to the formation of hard-to-destroy oil sludge that accumulates in the emergency reservoir.

This precipitate was a paste-like mass of black. Its basis is high-molecular asphalt-resin compounds, similar (similar) to those whose release at the oil-water interface and the bottom of the vessel from emulsions was observed during experiments on the dehydration of oil (supra-salt horizon) of the Kenkiyak field. In an experiment, the contents of the emergency tank were poured into two test tubes, into which the declared TNL demulsifier and the well-known KLN-2 reagent with a dosage of 200 g / t of oil were injected, the tubes were shaken identically and placed in a thermostat with a temperature of 50 ° C.

The separation of the test paste-like sample of the emergency reservoir was fairly rapid, with both demulsifiers after about 10 minutes about 80% of the water was released from the sample. Thus, it was found that this content could well be divided into components. The separated aqueous phase was dark gray, almost black, which was caused not only by petroleum products, but also by products of hydrogen sulfide corrosion. The presence of these corrosion products in water, similarly to mechanical impurities, prevents the separation of the investigated system into components, as we see, up to 80% of the content of the aqueous phase in it. This effect can be eliminated only by reducing the corrosion of oilfield equipment by using a more effective corrosion inhibitor, the well-known KO-101 inhibitor used has shown that it has insufficient effectiveness to solve this problem.

Thus, the claimed demulsifier TND proved to be an effective corrosion inhibitor and has properties that reduce corrosion and deposits of high molecular weight compounds, and the ability to prevent the accumulation of hard-to-destroy oil sludge. (“Report on the results of laboratory tests of the demulsifier TND on oil-water emulsions of the Zhanazhol, Kenkiyak and Severnaya Truva fields of JSC“ SNPS Aktobemunaigas ”. LLC“ Proton-oil-technology ”, LLC“ New Technologies ”, Kazakhstan, Aktobe, Russian Federation, city of Tyumen, 2015)

The claimed demulsifier TND obtained by mixing the components, while first separately mixed in predetermined proportions of the first and second mixtures, which are then mixed together in predetermined proportions in the following ratio (mass%):

the first mixture is 24.5-29.5

the second mixture is the rest.

The first mixture contains the following components:

modified polymer alkoxylate,

a solution of ethoxylated phenolic resin in an aromatic solvent, methanol solvent, which are mixed with each other in the following ratio (mass%):

modified polymer alkoxylate - 12.5-17.5,

a solution of ethoxylated phenolic resin in an aromatic solvent - 12.5-17.5,

methanol solvent - the rest,

The second mixture contains the following components:

a block copolymer of ethylene and propylene oxides, a solution of a modified polyol in a system of aromatic solvents, a solution in toluene of a product obtained by alcoholate polymerization of alkylene oxides on condensed alkyl phenol and a mixture of an organic solvent and methanol in a ratio of 1/10, which are mixed together in the following ratio ( mass%):

block copolymer of ethylene oxide and propylene - 8.5-13.5,

a solution of a modified polyol in a system of aromatic solvents - 29.5-35.5,

a solution in toluene of a product obtained by alcoholate polymerization of alkylene oxides on condensed alkyl phenol - 28.4-33.5,

a mixture of organic solvent and methanol in a ratio of 1/10 - the rest.

As a modified polymer alkoxylate, a reagent is used, for example, manufactured under the name "Kemelix D510" (Kemelix reagent, Croda, England).

As a solution of ethoxylated phenolic resin in an aromatic solvent, a reagent is used, for example, sold under the name "Kemelix D304" (Kemelix reagent, Croda, England).

As a block copolymer of ethylene oxide and propylene, a reagent is used, for example, produced under the name "Lapromol", for example, Lapromol 294 according to TU 2226-010-10488057-94.

As the solvent used (methyl alcohol), for example, methanol brand "A" according to GOST 2222-95.

As a solution of the modified polyol in a system of aromatic solvents, a reagent is used, for example, produced under the name Reapon 16T, Reapon 18U.

As a solution in toluene of a product obtained by alcoholate polymerization of alkylene oxides on condensed alkyl phenol, a reagent, for example, produced under the name of Reapon 3T, REAGENT-DEMULGATOR REAPON-3T-TU 2458-357-10488057-2000, is used.

As an organic solvent use, for example, xylene according to GOST 2706.1-74

As methanol (methyl alcohol), for example, methanol of brand “A” according to GOST 2222-95 is used.

The decrease in the claimed compositions of the demulsifier TND content of the proposed components below the stated limits reduces the integrated effectiveness of the composition, for example,

reduces the depth of dehydration,

reduces the rate of separation of water from oil,

reduces the quality of water treatment.

The increase in the claimed compositions of the demulsifier TND content of the proposed components above the stated limits reduces the integrated effectiveness of the composition, and is not economically feasible.

Example 1

Prepare a demulsifier as follows:

first prepare the first mixture for which the following components are sequentially loaded into the container:

8 g (14.8%) of Kemelix D510 reagent,

8 g (14.8%) of Kemelix D304 reagent and

38 g (70.4%) of brand A methanol according to GOST 2222-95.

This composition is mixed with well-known means and the generally accepted method until the mixture is uniform, for example, within 30 minutes, the first mixture is ready.

Then a second mixture is prepared for which the following components are sequentially loaded into another container:

16 g (10.8%) of Lapromol 294 reagent,

48 g (32.4%) of Reapon 18U reagent,

46 g (31.1%) of Reapon 3T reagent,

38 g (25.7%) of a mixture of xylene according to GOST 2706.1-74 and methanol grade "A" according to GOST 2222-95 in a ratio of 1/10.

This composition is mixed with well-known means and the generally accepted method until the mixture is uniform for, for example, 30 minutes, the second mixture is ready.

After which the finished first and second mixtures are loaded into a third container:

54 g (26.7%) of the first mixture and 148 g (73.3%) of the second mixture.

Both mixtures are mechanically mixed: the first mixture and the second mixture to the state of a homogeneous TND demulsifier solution.

The TND obtained by the demulsifier was treated with a predetermined amount of oil-water emulsion from the West Ustbalyksky oil field and oil was obtained with a water content of 0.3%.

Compared with the demulsifier Decleave R-14 and Rekod 505B, which were used at the field prior to testing the demulsifier TND and provided oil with a water content of 0.4%, water purification from oil products 47 mg / l at a dosage of 112 g / ton of oil, the proposed demulsifier The high pressure oil pump provided effective oil and water purification with improved indicators: the presence of water in oil 0.3% and oil products in water 12 mg / l at a dosage 2.5 times lower: 45 g / ton of oil (Table 2).

In other words, the declared demulsifier TND effectively separates water from the oil-water emulsion, while purifying the released water to a state where the characteristics of the purified water allow it to be pumped directly into the reservoir.

Example 2

Prepare a demulsifier as follows:

first prepare the first mixture for which the following components are sequentially loaded into the container:

7 g (13.0%) of Kemelix D510 reagent,

7 g (13.0%) of Kemelix D304 reagent,

40 g (74.0%) of methanol grade “A” according to GOST 2222-95.

This composition is mixed with well-known means and the generally accepted method until the mixture is uniform, for example, within 30 minutes, the first mixture is ready.

Then a second mixture is prepared for which the following components are sequentially loaded into another container:

16 g (9.6%) of Lapromol 294 reagent,

52 g (31.3%) of Reapon 16T reagent,

50 g (30.1%) of Reapon 3T reagent,

48 g (29.0%) of a mixture of xylene according to GOST 2706.1-74 and methanol grade "A" according to GOST 2222-95 in a ratio of 1/10.

This composition is mixed with well-known means and the generally accepted method until the mixture is uniform, for example, for 30 minutes, the second mixture is ready.

After which the finished first and second mixtures are loaded into a third container:

54 g (24.5%) of the first mixture and 166 g (75.5%) of the second mixture.

Both mixtures are mechanically mixed: the first mixture and the second mixture to the state of a homogeneous TND demulsifier solution.

The obtained HDI demulsifier processed the oil-water emulsion at the Sredne-Itursky oil field and received oil with a water content of 0.07%, water purified from oil products up to 52 mg / l.

Compared with the demulsifier FLEK D-012, which was used at the field and provided oil with a water content of 0.08% at a dosage of 72 g / ton of oil, the demulsifier TND provided effective oil refining with an improved indicator: the presence of water in oil 0.07% , at a dosage of 5.8 times lower: 12.5 g / ton of oil (table. 2).

In other words, the declared demulsifier TND effectively separates water from the oil-water emulsion, while purifying the released water to a state where the characteristics of the purified water allow it to be pumped directly into the reservoir.

Example 3

Prepare a demulsifier as follows:

first prepare the first mixture for which the following components are sequentially loaded into the container:

9 g (16.7%) of Kemelix D510 reagent,

9 g (16.7%) of Kemelix D304 reagent,

36 g (66.6%) of brand A methanol according to GOST 2222-95.

This composition is mixed with well-known means and the generally accepted method until the mixture is uniform, for example, within 30 minutes, the first mixture is ready.

Then a second mixture is prepared for which the following components are sequentially loaded into another container:

14 g (10.9%) of Lapromol 294 reagent,

43 g (33.3%) of Reapon 16T reagent,

41 g (31.8%) of Reapon 3T reagent,

31 g (24.0%) of a mixture of xylene according to GOST 2706.1-74 and methanol grade "A" according to GOST 2222-95 in a ratio of 1/10.

This composition is mixed with well-known means and the generally accepted method until the mixture is uniform, for example, for 30 minutes, the second mixture is ready.

After which the finished first and second mixtures are loaded into a third container:

54 g (29.5%) of the first mixture and 129 g (70.5%) of the second mixture.

Both mixtures are mechanically mixed: the first mixture and the second mixture to the state of a homogeneous TND demulsifier solution.

The obtained HDI demulsifier treated the oil-water emulsion from the Prirazlomnoye oil field and obtained oil with a water content of 0.1%. Compared to the Rekod-118 demulsifier, which was used at the field and provided oil with a water content of 0.4% at a dosage of 61 g / ton of oil, the TND demulsifier provided effective oil refining with an improved indicator: the presence of water in oil at 0.1% at a dosage 2.5 times lower: 45 g / ton of oil.

In other words, the claimed demulsifier TND has a complex effect, including, effectively separating water from a water-oil emulsion.

The maximum degree of oil dehydration at the minimum flow rate of the declared demulsifier TND is shown: the flow rate of the declared demulsifier TND is several times lower than the flow rate of the known demulsifier compositions when used.

The implementation of the declared demulsifier TND for the separation of oil-water emulsions of light, medium, heavy oils allows us to ensure high quality separation of oil-water emulsions with the aim of obtaining commodity dehydrated oil and produced water with high purification quality (the process of simultaneous deep dehydration of oil emulsions and high quality purification of water extracted from oil - commercial water).

Providing effective purification of produced water during the separation and its separation from oil allows you to immediately pump it into the reservoir.

Also, the claimed technical solution used for the separation of water-oil emulsions of light, medium, heavy oils;

- has inhibitory properties of paraffin,

- possesses inhibitory properties of corrosion, protecting oilfield equipment from corrosion, including systems for collecting, transporting and preparing oil;

has the ability to prevent the formation of highly stable oil-water emulsions, contributing to the desalination of oil emulsions.

Abbreviations:

UPN - oil treatment unit;

CSN - booster pump station;

CPPN - the central point of oil preparation;

DSP - the central point of oil collection;

UPSV - installation of preliminary water discharge;

NM - oil field;

Explanation:

basic demulsifier - a demulsifier used at oil treatment facilities.

Continuation of table 2

Abbreviations:

OPI - pilot tests;

CSN - booster pump station;

DSP - the central point of oil collection;

UPSV - installation of preliminary water discharge;

NM - oil field;

Not a deputy. - the oil content in the produced water was not measured.

Explanation:

Basic demulsifier - a demulsifier used at oil treatment facilities;

Claims (1)

A demulsifier for dehydration and desalting of oil emulsions containing the first mixture and the second mixture, mixed together in the following ratio: the first mixture is 24.5-29.5 wt.%, The second mixture is the rest, and the first mixture contains 12.5-17 , 5 wt.% Of the modified polymer alkoxylate, representing Kemelix D 510, 12.5-17.5 wt.% Solution of ethoxylated phenolic resin in an aromatic solvent, representing Kemelix D 304, and the methanol solvent - the rest, the second mixture contains 8, 5-13.5 wt.% Block copolymer of ethylene oxides and propyl ene, which is Lapromol 294, 29.5-35.5 wt.%, a solution of a modified polyol in an aromatic solvent system, representing Reapon 18U or Reapon 16T, 28.4-33.5 wt.%, a solution in the product toluene, obtained by alcoholate polymerization of alkylene oxides on condensed alkyl phenol, which is Reapon 3T, and the rest is a mixture of an organic solvent and methanol in a ratio of 1/10.