Hydrogen sulfide and/or light-weight mercaptan neutralizing agent and method of neutralizer usage

FIELD: oil production, oil refinery and petrochemical industries, particularly for hydrogen sulfide and mercaptan neutralization in hydrocarbon medium with the use of chemical neutralization agents.

SUBSTANCE: hydrogen sulfide and mercaptan neutralizing agent comprises 30-58% by weight of formalin, alkali metal, preferably sodium, hydroxide or carbonate in amount of 0.1-3% by weight, hexamethylenetetramine in amount of 15-25% by weight, remainder is tertiary alkamine, preferably triethanolamine and/or methyldethanolamine. Neutralizing agent in accordance with the second embodiment additionally includes bactericide composition.

EFFECT: increased neutralizing agent efficiency, enhanced manufacturability (low solidification temperature) and reactivity, provision of high hydrocarbon medium (oil, oil product and gaseous hydrocarbon) cleaning of hydrogen sulfide and light-weight mercaptans at room and increased temperatures (of 10-90°C and higher), improved bactericidal activity and corrosion inhibiting effect in hydrogen sulfide mediums, possibility of neutralizing agent usage as bactericide and corrosion inhibitor in oil-field media.

7 cl, 15 ex, 1 tbl

 

The invention relates to the field of neutralization of hydrogen sulfide and light mercaptans in hydrocarbon environments, chemical reagents-converters and can be used in oil and gas, refining and petrochemical industry for the purification of sulfur crude oil, condensate, petroleum products, petroleum and natural gas from hydrogen sulphide and light mercaptans.

Known methods of purification of oil and oil products from the hydrogen sulfide by treating them with organic reagents-converters, in particular anhydrides, haloganated, inorganic salts of carboxylic acids, peroxide, isocyanates, diisocyanates, azodicarboxylate, fumaronitrile, diaminoethane, aminosidine, polyamidine and others (U.S. Pat. UK No. 2185994, 2185995, 2186590, Pat. USA№№4909925, 5074991, 5169411, 5223127, 5266185 and others).

The main disadvantages of the known methods that prevent their widespread use in industry are high cost and high consumption of the reagents-neutralizers. Also known reagents in most cases, do not provide effective cleaning hydrocarbons from hydrogen sulfide and mercaptans.

Known purification method of crude oil and petroleum products from the hydrogen sulfide and/or mercaptans by processing the feedstock effective to the number of organic reagent, which ion of the Quaternary ammonium salts and received by epoxydecane tertiary organic amine oxide alkylene, preferably ethylene or propylene. While processing the raw materials an effective amount of reagent-catalyst is preferably carried out at a temperature of 100-400°F (U.S. Pat. U.S. No. 5344555, C10G 29/20, 1994).

The disadvantages of this method are the high cost of the used reagent-catalyst efficiency and significant energy consumption due to the necessity of carrying out the process at elevated temperatures. In addition, the reagent does not have the selectivity to hydrogen sulphide and light mercaptans (reacts with contained in raw water, oil, acids and others), which leads to unnecessarily high consumption and cost of the cleanup process as a whole.

There is also known a method of purification of liquid and gaseous hydrocarbons (oil and gas) of hydrogen sulfide by treatment of the feedstock with an organic reagent-Converter, which is a product of the interaction of alkylenediamine, mainly Diethylenetriamine, with formaldehyde (formalin) in a molar ratio of polyamine: formaldehyde of 1:1-14, preferably 1:1-3 (U.S. Pat. U.S. No. 5284576, C10G 29/20, 1994).

However, applied the neutralizer is an expensive product, possesses n is scoi reactivity towards mercaptans, and so this method does not provide effective cleaning hydrocarbons from mercaptans. In addition, the Converter has a high foaming ability and, therefore, it is unsuitable for the desulfurization of gases.

Known use for neutralization of hydrogen sulfide in the oil well (in the production of oil wells) neutralizing the liquid containing polyglyceryl - products of waste glycerol and aqueous solution of sodium chloride in the following ratio of components,% vol.: polyglyceryl 60-90%, aqueous solution of sodium chloride 10-40% (U.S. Pat. Of the Russian Federation No. 2136864, EV 43/22, 37/06, 1999).

However, this neutralizing liquid is not sufficiently high absorption capacity against hydrogen sulfide and mercaptans, which then requires the injection into the well of significant amounts of neutralizer, which increases the material costs of the whole process.

Closest to the proposed invention is a method of purification of crude oil and petroleum products from hydrogen sulfide and mercaptans by processing the feedstock effective amount of hexamethylenetetramine (it has been) at a temperature of 100-350°F. an effective amount of it has been directly proportional to the concentration of hydrogen sulfide and mercaptans in the processing of raw materials and ranges from 10 to 100,000 ppm. In the following, the natural enemy embodiment, the method applied the neutralizer is a 40%aqueous solution it has been (U.S. Pat. U.S. No. 5213680, C10G 29/20, 1993).

In the specified method available and relatively inexpensive reagent Converter. However, the applied aqueous solution it has been has a low reactivity towards hydrogen sulfide and light mercaptans, which then requires carrying out the process at elevated temperatures (above 80-100° (C) and a high flow catalytic Converter (up to 100 thousand ppm). This leads to a significant energy consumption for heating of raw materials and reduce the efficiency of the process as a whole. In addition, a known catalyst is not enough technology for practical application in field conditions in winter time because of the relatively high temperature of solidification (minus 15°). These shortcomings hinder the industrial application of aqueous solutions it has been as reagent-Converter for field cleaning of sulfur crude oil and gas from hydrogen sulphide and light mercaptans.

The present invention is the task of creation on the basis of hexamethylenetetramine composition of the neutralizer with processability (low pour point and high reactivity towards hydrogen sulfide and light mercaptans and ensuring their effective neutralizing both at normal and elevated temperatures. Another object of the invention t is aetsa improving the purity of hydrocarbons from hydrogen sulfide and light mercaptans.

The problem is solved in that the chemical reagent neutralizer sulfide and light mercaptans, including hexamethylenetetramine and a solvent, the solvent contains tertiary amerosport and additionally contains about 37%solution of formaldehyde - formaldehyde and hydroxide and/or carbonate of an alkali metal in the following ratio, wt.%:

Formalin30-58
Hydroxide and/or carbonate of an alkali metal0,1-3
Hexamethylenetetramine15-25
Tertiary amerosportRest

In another embodiment of the invention the catalyst of hydrogen sulfide and light mercaptans, comprising hexamethylenetetramine, tertiary amerosport, formaldehyde and hydroxide and/or carbonate of an alkali metal, optionally contains a bactericidal drug is bactericidal against sulfate-reducing bacteria (SRB), in the following ratio, wt.%:

Formalin30-58
Hydroxide and/or carbonate of an alkali metal0,1-3
Hexamethylenetetramine0,1-22
Bactericide 5-35
Tertiary amerosportRest

As the tertiary amerosport the proposed Converter mainly contains triethanolamine and/or methyldiethanolamine, and as a hydroxide, carbonate of alkaline metal hydroxide, carbonate or bicarbonate. As bactericide Converter mainly contains a bactericidal drug brand "Bakrid" on the basis of the trimer ethanolamine and/or Consid" based on 1,3-oxazolidine.

The task of increasing the degree of purification of liquid and gaseous hydrocarbons from hydrogen sulfide and light mercaptans is solved by processing the original raw materials, oil, petroleum products and hydrocarbon gases by the catalyst of the above composition(s), taken at the rate of not less than 3 g per 1 g neutralizing of hydrogen sulfide and/or light mercaptans, preferably at least 5 g/g While the processing of the feedstock is carried out at a temperature of 10-90°C, preferably at 20-60°and atmospheric or increased pressure.

The proposed composition in normal conditions are homogeneous moving liquid from light yellow to dark brown color with a density in the range from 1.0 to 1.20 g/cm3and the value of pH from 7.5 to 12 (depending on the content of the alkaline agent). This technical solution which allows you to essentially get a new, more effective and all-season commodity form of reagent-catalyst with a pour point of minus 30-40°and below, suitable for field application in oil and gas companies in regions with harsh climatic conditions, and as a reagent complex action - Converter of hydrogen sulfide, light mercaptans, biocide and corrosion inhibitor in hydrogen sulfide-containing environments.

As a raw material for the preparation of a catalyst mainly use the product hexamethylenetetramine (urotropine according to GOST 1381), formalin (according to GOST 1625 or THE 38.602-09-43-92), triethanolamine (on THE 6-02-916-79), sodium hydroxide (caustic soda according to GOST 2263 or GOST 11078) and bactericidal drug brand "Bakrid" (on THE 2484-010-05744685-96) or Consid" (on THE 2458-012-00151816 - 99). Bactericide brand "Bakrid containing a trimer based on ethanolamine General formula C9H21N3About3represents the liquid from light yellow to light brown color with a density of 1.10-1.20 g/cm, a refractive index 1,460-1,490 and pH of the water solution of 9.5 to 10.5, and is used as bacteriostatic long-term actions to protect against microbial infections aqueous solutions and emulsions of organic substances, cutting fluids for metal (U.S. Pat. Of the Russian Federation No. 2190008, SM 173/02, 2002 and others). Bactericide m the RCTs "Contid" based on 1,3-oxazolidine is a movable liquid from light yellow to dark brown color with a density of 1.00-1.08 g/cm, the pH of an aqueous solution of 8.0 to 9.6, pour point -30 to 40°and the total nitrogen content of 3.5 to 3.9 and used in the oil industry in the cover process fluids to inhibit sulfate-reducing microflora of formation waters (U.S. Pat. Of the Russian Federation No. 2166064, EV 41/02, 2001 and others).

These raw materials are produced on an industrial scale and are easily accessible products, i.e. from the point of view of availability of raw material the proposed Converter is industrially applicable. You should specify that as the tertiary amerosport can be used also methyldiethanolamine and dimethylethanolamine, but currently they are relatively expensive products and their use would increase the cost of the proposed Converter. It should also be pointed out that as a bactericide proposed Converter may contain other known antibacterial drugs with effective bactericidal action against sulfate-reducing bacteria, in particular bactericide brand "Sultan" beyond 2458-003-42147065 OP 99, as well as amino esters of General formula (R-)n N(-CH2-O-R')mwhere R and R'is alkyl, isoalkyl, alkenyl; n=1 or 2, m=3-n (W. Oil refining and petrochemistry", No. 10, 2000, p.36-38 and No. 1, 2002, p.40-42). However, currently they are on an industrial scale are not made, a poet who cannot be recommended for commercial use.

The analysis selected in the search process known technical solutions showed that in science and technology in this area there is no object, analogous to the claimed combination of features and properties, which allows to make a conclusion on compliance with its criteria of "novelty" and "inventive step".

To prove the conformity of the object to the criterion of "industrial applicability" below are specific examples of the preparation of catalysts (examples 1-6) and methods of its use for treatment of liquid and gaseous hydrocarbons from hydrogen sulfide and light mercaptans (examples 7-13), and to inhibit the growth of sulfate reducing bacteria and inhibition of hydrogen sulfide corrosion (examples 14 and 15).

Example 1. In capacity, equipped with a mechanical stirrer, a load of 49 g of triethanolamine (tea) and under stirring portions enter 35 g of formalin and 1 g of sodium hydroxide, and then 15 g of solid hexamethylenetetramine (it has been). The mixture is stirred until complete dissolution it has been and homogeneous product.

Example 2. To 51.9 g methyldiethanolamine (MDEA) under stirring enter 33 g of formalin and 0.1 g of sodium carbonate, and then 15 g it has been. The mixture is stirred until complete dissolution it has been and homogeneous product.

Example 3. To 54 g of formalin under stirring administered 1 g of sodium hydroxide and 13 g of tea, and then 22 g it has been. A mixture of AC who're asked to complete dissolution it has been, and then add 10 g of bactericidal drug "Bakrid" beyond 2484-010-05744685-96 and the mixture is additionally stirred to obtain a homogeneous product.

Example 4. To 58 g of formalin under stirring administered 1 g of sodium hydroxide and 16 g of tea, and then 20 g it has been. The mixture is stirred until complete dissolution it has been, and then add 5 g of bactericidal drug "Contid" beyond 2458-012-00151816-99 and the mixture is additionally stirred to obtain a homogeneous product.

Example 5. To 45 g of formalin under stirring enter 18 g of tea and 2 g of sodium hydroxide, and then 5 g it has been. The mixture is stirred until complete dissolution it has been, and then add 30 g of bactericidal drug "Bakrid" and the mixture is additionally stirred to obtain a homogeneous product.

Example 6. To 40 g of formalin under stirring introduce 0.1 g and it has been 3 g of sodium hydroxide, added in several portions 35 g bactericidal drug "Bakrid", and then of 21.9 g of tea and the mixture is additionally stirred to obtain a homogeneous product. The composition of the catalysts obtained in examples 1-6 in table.

The resulting compositions have a pour point according to standard methods GOST 20287. The test results presented in the table. Here, for comparison, the test result on the pour point of the Converter prototype (40%aqueous solution of G IS THE same).

The resulting composition under normal conditions are homogeneous moving liquid from light yellow to brown color with a characteristic smell of formaldehyde, the density of 1.01-1,15 g/cm3and pour point below minus 30°C.

Example 7. The use of the catalyst of example 1 for neutralization of hydrogen sulfide and light methyl-, ethyl mercaptan in petroleum. In the temperature-controlled reaction flask with stirrer injected with 0.2 g of the catalyst of example 1, and then load 100 ml (92 g) high-carbon oil containing 0.025 wt.% (250 ppm) of hydrogen sulfide and 0,082 wt.% mercaptan sulfur, including to 0.011 wt.% (110 ppm) lung methyl-, ethyl mercaptan. The mass ratio of catalyst: hydrogen sulfide + methyl-mercaptan in the reaction mixture is 6:1, i.e. the specific consumption of the Converter (the expense ratio) amounts to 6 g/g Reaction mixture is stirred for pritemperature 40°C for 3 h and conduct quantitative analysis of oil content of residual hydrogen sulfide and light mercaptans, and calculate the degree of purification of oil. The degree of purification of oil from the hydrogen sulfide is 100% and from the lungs methyl-, mercaptan - 96%, i.e. the proposed Converter of example 1 has a high reactivity and when the expenditure ratio of 6 g/g provides effective neutralization servodata lung methyl-, the mercaptan, which allows to obtain marketable oil, corresponding to the standards GOST R 51858-2002 content of hydrogen sulfide and methyl-, ethyl mercaptan.

Example 8. Test Converter according to example 2 on the efficiency of neutralization of hydrogen sulfide and light methyl-, ethyl mercaptan in petroleum spend the same conditions of example 7, but at specific discharge (supply factor) Converter 5 g/, the Degree of purification of oil from the hydrogen sulfide is 100% and from the lungs methyl-, mercaptan - 89%, i.e. the Converter according to example 2 when the expenditure ratio 5 g/g provides effective neutralization of hydrogen sulfide and light mercaptans and allows to obtain marketable oil GOST R 51858.

Example 9. Test Converter according to example 3 on the efficiency of neutralization of hydrogen sulfide and light methyl-, ethyl mercaptan in petroleum spend the same conditions of example 7, but at room temperature (22°). The degree of purification of oil from the hydrogen sulfide is 100% and from light mercaptans - 88%, i.e. the Converter according to example 3 at room temperature and the feed ratio of 6 g/g provides effective neutralization of hydrogen sulfide and light mercaptans and allows to obtain marketable oil GOST R 51858.

Example 10. Test Converter according to example 4 on the efficiency of neutralization of hydrogen sulfide and light methyl-, ethyl is mercaptans in oil performed similarly and in the conditions of example 7, but at a temperature of 22°C. the Degree of purification of oil from the hydrogen sulfide is 100% and from light mercaptans - 87%, i.e. the Converter according to example 4 at room temperature and the feed ratio of 6 g/g provides effective neutralization of hydrogen sulfide and light mercaptans and allows to obtain marketable oil GOST R 51858.

Example 11. Test Converter according to example 5 on the efficiency of neutralization of hydrogen sulfide and light methyl-, ethyl mercaptan in petroleum spend the same conditions of example 7, but at a temperature of 60°C. the Degree of purification of oil from the hydrogen sulfide is 100% and from light mercaptans - 98%, i.e. the Converter according to example 5 at an elevated temperature and feed ratio of 6 g/g provides effective neutralization of hydrogen sulfide and light mercaptans and allows to obtain marketable oil GOST R 51858.

Example 12. Test Converter according to example 6 on the efficiency of neutralization of hydrogen sulfide in fuel spend and likewise the conditions of example 7, but at a temperature of 70°C. the Degree of purification of oil from the hydrogen sulfide is 100%, i.e. the proposed Converter provides efficient treatment of oil products (fuel oil) from hydrogen sulfide.

Example 13. The use of a Converter according to example 3 for cleaning gas from hydrogen sulphide. In a glass Packed absorber, zapolnennajaj process, with a diameter of 20 mm and a height of 500 mm load 40 ml of the catalyst from example 3. Then, at room temperature and atmospheric pressure is passed through the absorber gas containing 2.5% vol. hydrogen sulfide and 2% vol. of carbon dioxide. Exhaust from the top of absorber purified gas is passed through the flask Drexel with 10%aqueous sodium hydroxide solution to absorb the residual hydrogen sulfide. At the end of the experiment the solution of alkali analyze the content of sulfide sulfur by potentiometric titration and calculate the residual concentration of hydrogen sulfide in the purified gas and the degree of gas purification. The degree of gas purification from hydrogen sulfide is 99.99%. This foaming catalyst and formation of solid reaction products are observed. Therefore, the proposed Converter is suitable for selective gas desulphurization, as contained in the oil gas carbon dioxide practically does not react with the catalytic Converter.

Comparative experiment showed that when the cleaning gas in the conditions of example 13 using known catalysts (40%aqueous solution of hexamethylenetetramine) the degree of gas purification from hydrogen sulfide is 83%, i.e. at normal temperatures is known Converter has a low reactivity and does not provide ffektivnoe cleaning gas from hydrogen sulphide.

Example 14. Test neutralizer on the effectiveness of inhibiting the growth of sulfate reducing bacteria (SRBs). Laboratory tests Converter according to examples 3-6 on the efficiency of inhibition of growth of SSC is carried out by well-known methods Assessment of contamination oilfield environments and bactericidal action of reagents relative to sulfate-reducing bacteria. Laboratory, bench and pilot tests. RD 03-00147275-067-2001. The Ufa. Dooo "Bashneft" JSC "Bashneft". 2001. 17 C. When conducting laboratory tests using cumulative culture with the content of the SSC 106cells/ml

The tests showed that the catalyst according to examples 3-6 at concentrations of 100-300 mg/l provides a complete inhibition of the growth of sulfate reducing bacteria in oil field water. Comparative tests in identical conditions showed that 40%aqueous solution it has been (prototype) at concentrations of 100-300 mg/l does not fully inhibit the growth of sulfate reducing bacteria. Therefore, the proposed Converter, unlike the prototype, has a high bactericidal activity against SSC and can be used as an effective biocide to inhibit the growth of sulfate reducing bacteria in oil field environments.

Example 15. Test neutralizer on corrosion performance. Protective effect of catalyst from example 3 evaluate the indicate by well-known methods "Methods of evaluation of corrosiveness of oilfield environments and the protective action of corrosion inhibitors using gages". RD 39-3-611-81. The Ufa. Vniisptneft. 1982. 34 C. In the case of corrosion tests as an aggressive environment using the model produced water according to GOST 9.506 density of 1.12 g/cm3when hydrogen sulfide concentration of 100 mg/L. Model produced water pre-obeskislorozhennuju inert gas. Test duration - 6 hours

Conducted corrosion tests showed that at concentrations of 50-200 mg/l Converter according to example 3 provides a protective effect within 70-86%, i.e. the proposed Converter has a protective effect in fluids containing hydrogen sulfide environment and, therefore, can be used as hydrogen sulfide corrosion inhibitor.

From the data presented in the table shows that the proposed Converter has a low pour point (minus 30-40°and below), therefore, has higher efficiency and is suitable for use in winter in regions with harsh climatic conditions. Presented in examples 7-13 data show that the proposed Converter has a high reactivity towards hydrogen sulfide and light mercaptans and provides effective neutralization in hydrocarbon environments, both at normal and elevated temperatures. Shown in examples 14 and 15, the data show that the proposed Converter obladaettakim high bactericidal activity against SSC and exerts a protective effect in fluids containing hydrogen sulfide environment and therefore, it can be used as bactericide-hydrogen sulfide corrosion inhibitor in oilfield environments.

Table
Sample numberComponent composition, wt.%Pour point, °
FormalinThe alkaline agentAmerosportIt has beenBactericide
135NaOH - 1The tea*- 4915-below minus 40
233Na2CO3- a 0.1MDEA is 51.915-minus 30
354NaOH - 1The tea - 1322"Bakrid"- 10below minus 40
458NaOH - 1The tea - 1620"Contid" - 5below minus 40
545NaOH - 2The tea - 185"Bakrid" - 30minus 38
640NaOH - 3The tea - 21,90,1"Bakrid" - 3 minus 40
7Prototype (40%aqueous solution it has been)minus 15
*Note: the tea - triethanolamine, MDEA - methyldiethanolamine, it has been - hexamethylenetetramine.

1. The neutralizer of hydrogen sulfide and/or light mercaptans in hydrocarbon environments, including hexamethylenetetramine and a solvent, wherein the solvent it contains tertiary amerosport and additionally contains about 37%solution of formaldehyde - formaldehyde and hydroxide and/or carbonate of an alkali metal in the following ratio, wt.%:

Formalin30-58
Hydroxide and/or carbonate of an alkali metal0,1-3
Hexamethylenetetramine15-25
Tertiary amerosportRest

2. The Converter according to claim 1, characterized in that the tertiary amerosport it mainly contains triethanolamine and/or methyldiethanolamine, and as a hydroxide, carbonate of alkaline metal hydroxide, carbonate, bicarbonate.

3. The neutralizer of hydrogen sulfide and/or light mercaptans in hydrocarbon environments, including hexamethylenetetramine is h and the solvent, characterized in that the solvent it contains tertiary amerosport and additionally contains about 37%solution of formaldehyde - formaldehyde and hydroxide and/or carbonate of an alkali metal and a bactericidal drug in the following ratio, wt.%:

Formalin30-58
Hydroxide and/or carbonate of an alkali metal0,1-3
Hexamethylenetetramine0,1-22
Bactericide5-35
Tertiary amerosportRest

4. The Converter according to claim 3, characterized in that the tertiary amerosport it mainly contains triethanolamine and/or methyldiethanolamine, and as a hydroxide, carbonate of alkaline metal hydroxide, carbonate, bicarbonate.

5. The Converter according to claim 3, characterized in that as a bactericide it mainly contains a bactericidal drug brand "Bakrid" on the basis of the trimer ethanolamine and/or Consid" based on 1,3-oxazolidine.

6. The method of purification of crude oil, petroleum and hydrocarbon gases from hydrogen sulfide and/or low molecular weight mercaptans by processing the feedstock chemical reagent, characterized in that as the last use of neutrons is the lyst according to any one of claims 1 to 5.

7. The method according to claim 6, characterized in that the treatment is carried out at a temperature of 10-90°C, preferably at 20-60°C.



 

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2 cl, 2 ex, 6 dwg, 7 tbl

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons with the use of chemicals or bacterial activity to increase oil output from non-uniform reservoirs and to isolate drowned wells.

SUBSTANCE: method involves injecting dispersion of colloid polyacrylamide or polysaccharide particles, or cellulose ester particles including aluminum poly-oxychloride in reservoir. Above components are taken in the following amounts (% by weight): polyacrylamide or polysaccharide, or cellulose ester - 0.005-0.5, aluminum poly-oxychloride - 0.0015-0.1, remainder is water. Volume of above dispersion is determined as V=π·R2mh, where R is radius of dispersion penetration in reservoir, m, m is mean porosity, parts, h is summary thickness of accommodating intervals, m.

EFFECT: increased reservoir coverage by injection of colloid particle dispersion obtained by intromolecular cross-linking of aqueous suspension of polyacrylamide or polysaccharide, or cellulose ester and aluminum poly-oxychloride, and, as a result, filtering and oil-sweeping properties change in non-uniform reservoir, improved ecological safety and technological efficiency.

1 ex, 2 tbl

FIELD: crude oil treatment.

SUBSTANCE: to remove hydrogen sulfide and mercaptans, 3-30% solution of urotropin in technical-grade formalin or in formalin/aqueous ammonia is added to crude material in amounts corresponding to 0.8-3.5 mole formaldehyde and 0.009-0.3 mole urotropin per 1 mole hydrogen sulfide and mercaptan sulfur. Reaction is carried out at 15 to 70°C. Method is applicable for oil and gas production and petroleum processing industries.

EFFECT: reduced consumption of reagents at high degree of purification of raw material.

5 cl, 3 tbl

The invention relates to petrochemistry, in particular to methods of refining oil, gas condensate and their fractions from mercaptans and hydrogen sulfide

The invention relates to the refining, in particular to methods of cleaning condensate and its fractions from mercaptans

The invention relates to methods for cleaning hydrocarbons from sulfur compounds and can be used in gas - and oil-refining industry

The invention relates to means for neutralization of hydrogen sulfide and light mercaptans, inhibit the growth of sulfate reducing bacteria (SRBs) and inhibition of hydrogen sulfide corrosion in oilfield environments

The invention relates to the purification of petroleum products from sulfur compounds and can be used in industry gazoneftepererabatyvayuschy

The invention relates to methods of oil for transport and can be used in the oil and gas industry in the preparation of sulfur crude oil, condensates with high content of hydrogen sulfide and mercaptans

The invention relates to petrochemistry, in particular to methods of refining oil, gas condensate and oil products, and oil-water emulsions from hydrogen sulfide and/or low molecular weight mercaptans, and can be used in oil, gas, refining, petrochemical and other industries

The invention relates to a process for recovering organic acids including naphthenic acids, heavy metals and sulfur from the source of crude oil

The invention relates to a process for recovering organic acids from the source of crude oil

FIELD: oil production, particularly to increase oil reservoir productivity and intake capacity of injection well by mud removal from well bottom zone of terrigenous clay reservoir having low permeability and/or from bottom of well characterized by decreased output resulted from pore mudding with clay material.

SUBSTANCE: method involves injecting aqueous hydrochloric acid solution; supplying aqueous surfactant solution; injecting aqueous oxygen-containing agent solution and performing time delay; supplying aqueous surfactant solution; injecting aqueous hydrochloric acid solution; executing time delay and developing well. Aqueous hydrochloric acid solution includes inhibited hydrochloric acid taken in amount of 4-12 % by weight, hydrofluoric acid in amount of 0.01-4% by weight, acetic acid in amount of 0.1-4% by weight, surfactant, namely oxyethylated monoalkylphenols based on propylene terpolymer in amount of 0.05-4% by weight, remainder is water. Volume of aqueous hydrochloric acid solution is equal to 0.1-3 m3 per 1 m of perforated productive reservoir thickness. The aqueous surfactant solution includes 0.1-3% by weight of surfactant and water and is taken in amount of 0.2-1 m3 per 1 m of perforated productive reservoir thickness. Aqueous oxygen-containing agent solution is 5-12% aqueous sodium carbonate perhydrate solution or 5-12% aqueous sodium borate perhydrate solution or 5-15% aqueous carbamide perhydrate solution or 3-10% aqueous hydrogen peroxide solution or 5-20% aqueous sodium hypocloride or 5-20% aqueous potassium hypocloride solution and is taken in amount of 0.1-3 m3 per 1 m of perforated productive reservoir thickness. Aqueous oxygen-containing agent solution may additionally include surfactant, namely oxyethylated monoalkylphenols based on propylene terpolymer in amount of 0.05-4% by weight. Time delay is carried out for not more than 8 hours.

EFFECT: increased treatment efficiency, increased well bottom zone permeability and well productivity.

3 cl, 1 tbl

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