The way of the development of oil deposits

 

The invention relates to the oil industry and can be used in the development of oil reservoir water flooding. The technical result is to increase oil recovery by increasing the coverage of deposits flooding and difficult to recover reserves, concentrated in the roof of the reservoir. In the way of the development of oil deposits, including the displacement of oil by gas-liquid slug is created by consecutive injection into the formation via the injection well an aqueous solution of soda ash Na2CO3and an aqueous solution of hydrochloric acid Hcl, and pushing through the formation of the buffer fluid prior to injection into the formation an aqueous solution of soda ash pump the aqueous solution of aluminum chloride AlCl3. Aqueous solutions of the reagents can be injected in the following ratio of their volumes: AlCl3:Na2CO3: HCl=(0,08-1,0):(1,0-2,5):1. The promotion can be carried out after injection of each reagent. In some cases, the operation of pumping and pushing aqueous solutions of sodium carbonate and hydrochloric acid repeat. 3 C.p. f-crystals, 1 table.

The invention relates to the oil industry and can be IP which is the way of the development of oil deposits, including the displacement of oil by gas-liquid slug is created by consecutive injection into the reservoir through injection wells reagent - aqueous solution of sodium carbonate and an aqueous solution of hydrochloric acid in equal amounts, when the concentration of calcium carbonate and hydrochloric acid is determined from the condition of full saturation of the generated rims with carbon dioxide at formation pressure and temperature, and then the push rims on reservoir water (RF patent 2125154).

This method allows you to increase the recovery rate by increasing the coverage of deposits flooding.

However, in cases of uneven water absorption oil reservoir this method does not lead to positive results.

The objective of the invention is to increase oil recovery by increasing the coverage of deposits flooding and difficult to recover reserves, concentrated in the roof of the reservoir.

The problem is solved in that in the method of development of oil deposits, including the displacement of oil by gas-liquid slug is created by consecutive injection into the formation via the injection well an aqueous solution of soda ash Na2CO3and an aqueous solution siniavino soda pre-fetch aqueous solution of aluminum chloride AlCl3.

Aqueous solutions of the reagents can be injected in the following ratio of their volumes: ll3:Na2CO3:HCl=(0,08-1,0):(1,0-2,5):1.

The promotion can be carried out after injection of each reagent.

In some cases, the operation of pumping and pushing aqueous solutions of sodium carbonate and hydrochloric acid to repeat.

The essence of technology lies in the fact that the mixture of aqueous solutions of sodium carbonate with hydrochloric acid and aluminum chloride leads to the emission of carbon dioxide and water-soluble sodium chloride directly in situ with the formation of gas-liquid rim. Concentration of aqueous solutions of the reagents are selected from the condition of full saturation of the generated rims with carbon dioxide at formation pressure and temperature. Specified gas-liquid b has a viscoelastic non-equilibrium properties, while moving along the layer helps to increase oil recovery by increasing the coverage of deposits flooding and difficult to recover reserves, concentrated in the roof of the reservoir.

The method is implemented as follows.

For development of oil deposits in accordance with the present invention was used with the line on THE 2111-131-05807960-97.

For the implementation of the technological process used existing pools of water flooding system (pipes, pumps, tanks for chemicals, mixing tanks and other), as well as cementing unit CA-320 unit for the acid treatment of wells unit ants-32/50, etc.

Before starting work, determine the acceleration of the formation.

Working solutions should be prepared immediately before injection.

In accordance with a specific pickup calculate the volume pumped into the well of the reagents. The reagents through the cementing head is installed on the wellhead, is injected into the well.

Example.

As an example implementation of the invention can lead to the development of oil deposits for injection wells with acceleration up to 500 m3/day and reservoir pressure of 17.5 MPa.

Materials and reagents provided in the table.

The injection scheme is as follows: 1. An aqueous solution of aluminum chloride - 2 m3.

2. The buffer liquid (water) - 5 m3.

3. An aqueous solution of soda ash 5 m3.

4. The buffer fluid - 5 m3.

5. An aqueous solution of hydrochloric acid (6 m)3.

6. The buffer fluid - 5 m3.

7. An aqueous solution of soda ash - 11 m3.

8. The buffer LM is p> 11. An aqueous solution of soda ash - 11 m3.

12. The buffer fluid - 5 m3.

13. An aqueous solution of hydrochloric acid (6 m)3.

14. The buffer fluid - 5 m3.

15. An aqueous solution of soda ash - 11 m3.

16. The buffer fluid - 5 m3.

17. An aqueous solution of hydrochloric acid (6 m)3.

18. The buffer fluid - 5 m3.

19. An aqueous solution of soda ash - 11 m3.

20. The buffer fluid - 5 m3.

When using the present invention achieves the following technical result: aligns the profile of injection wells, resulting in increased oil recovery by increasing the coverage of deposits flooding and difficult to recover reserves, concentrated in the roof of the reservoir.

Claims

1. The way of the development of oil deposits, including the displacement of oil by gas-liquid slug is created by consecutive injection into the formation via the injection well an aqueous solution of soda ash PA2CO3and an aqueous solution of hydrochloric acid Hcl, and pushing through the formation of the buffer fluid, characterized in that before being pumped into bloob under item 1, characterized in that the aqueous solutions of the reagents are pumped in the following ratio of their volumes: ll3:Na2CO3:HCl=(0,08-1,0): (1,0-2,5):1.

3. The method according to p. 1 or 2, characterized in that the pushing is carried out after the injection of each reagent.

4. The method according to any of paragraphs.1-3, characterized in that the operation of pumping and pushing aqueous solutions of sodium carbonate and hydrochloric acid repeat.

 

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FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

8 cl

FIELD: oil and gas production.

SUBSTANCE: invention aims at increasing productivity of oil- and gas-producing and injecting wells exposing high-temperature low-permeable oil reservoirs. In the treatment method according to invention including forcing enzyme substrate and separate enzyme into formation and creating conditions to enzymatically convert substrate into acid, geologic and productive characteristics for each interval of bottom zone are determined in order to pick out low-permeable intervals of oil reservoir for treatment, whereupon properties of enzyme substrate and separate enzyme as well as conditions for their pumping are chosen. Substrate utilized in the method is head fraction of methyl- and/or ethyl-, and/or butyl acetate production, to which aliphatic alcohols are added, and enzyme is an acid solution. Substrate is pumped simultaneously and/or before, and/or after pumping of enzyme, after which well is closed for some time and then opened and placed under predetermined operational conditions.

EFFECT: enhanced efficiency of acid treatment due to increased phase permeability for oil and deepness of active acid-treated zone of low-permeable oil reservoirs.

25 cl, 1 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: invention is intended for use during development of oil pools at different waterflooding phase for intensifying functioning of producing wells and increasing current oil recovery of formation. Composition contains, wt %: liquid hydrocarbon 10.0-20.0, oil-soluble surfactant 0.3-5.0, water-soluble or water-oil-soluble surfactant 0.1-1.0, superfine hydrophobic material 0.1-2.0, and water (the rest). Composition may further contain 0.3-5.0% calcium chloride. Oil recovery is increased owing to hydrophobization of formation structure, reduction of surface tension in water/rock/oil phase boundary, increase in detergent power of polluted surface, increase in composition viscosity, and increase of relative permeability of the formation for hydrocarbon phase as compared with water phase.

EFFECT: increased oil recovery.

2 cl, 2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: composition contains 0.05-2.5% of hydrophobic power, 0.05-10% of ethylene/vinyl acetate copolymer, and organic solvent. Composition intensifies oil production owing to increased effective radius of formation bottom area treatment, prevention of moistening inversion effect upon fall of hydrophobic agent concentration, and, consequently, decreased volume of simultaneously produced water.

EFFECT: increased oil production, prolonged overhaul period, improved environmental safety, and lowered production expenses.

2 tbl, 3 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling product and force wells, forcing gas and water through force wells into separate zones of productive bed and extraction of hydrocarbons from product wells, forming separate gas, water and hydrocarbon saturated areas with major contents of respectively gas, collected therein for later use, water and hydrocarbons, periodical pumping of collected gas from formed gas saturated zones to water saturated zones, periodical pumping of water to gas saturated zones is performed. It is possible to pump collected gas to water saturated zones in form of gas-water mixture. It is possible to pump in passing gas of current deposit. It is possible to pump hydrocarbon or non-hydrocarbon gas from other sources. It is possible to pump water with admixture of specifically selected chemical reagents or compositions thereof. When gas content in water saturated zones reaches from 0.1 to 28% from water content in water saturated zones it is reasonable to generate resilient waves with frequency within range from 0.0001 to 45 KHz and amplitude within range from 0.02 to 2.8 MPa. It is reasonable to pump gas and water to separate areas of productive bed with concurrent generation of resilient waves in there with frequency within range from 0.0001 to 45 KHz and amplitude within limits from 0.02 to 2.8 MPa.

EFFECT: higher efficiency.

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FIELD: oil extractive industry.

SUBSTANCE: method includes pumping of Sulfacella water dispersion into bed through force well and extraction of oil through extracting well, said dispersion additionally containing non-ionogenic surfactant AF9-12 with following ratio of components, in percents of mass: Sulfacella 0.5-1, AF9-12 0.01-0.1, water- the rest, while, before pumping of said dispersion mineralized water is pumped with total mineralization until 290 g/l in amount of 10% from volume of said dispersion, when pumping said dispersion prepared in fresh water, drain water is previously pumped, and when pumping said dispersion made from drain or bed water, bed water is previously pumped. For preparation of said dispersion fresh, drain or bed water is used with mineralization till 290 g/l.

EFFECT: higher efficiency.

2 cl, 2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes examination of operation well for gas-condensation and periodical cleaning of face-adjacent well area from precipitating hydrocarbon condensate by pumping hydrocarbon condensate solvent into bed, exposure of well for period of condensate dissolution and following removal of received solution from face-adjacent area during well launch, as solvent binary mixture is used with unlimited mutual solubility of components, while at least one of them has unlimited mutual solubility with hydrocarbon condensate, and relation of binary mixture components is determined from previously built phase diagram of three-component system, formed during dissolution of hydrocarbon condensate. As binary mixture with unlimited mutual solubility of components a mixture of acetone and methanol is used, or chloroform and methanol, or chloroform and aniline, or chloroform and acetone.

EFFECT: higher productiveness.

2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes placing water solution of carnallite ore, either modified, concentrated, or mixtures thereof, said solution is used at maximal for well temperature conditions concentration and is pumped in amount, necessary and enough for forming a hydraulic column in well shaft above ceiling of productive bed and along remaining shaft height well is filled with water up to mouth. Carnallite ore used has composition, in percents of mass: potassium chloride 20.5-21.5; sodium chloride 19.5-22.5; magnesium chloride 24.0-27.0; crystallization water 29.5-30.5. Modified ore has composition, in percents of mass: potassium chloride 23.0-29.5; magnesium chloride 31.8-46.0; crystallization water - the rest. Said water solution is prepared by dissolving ore in fresh technical water, drained from oil preparation plants, or in bed water. In case of dissolving in bed water, the latter is pumped from well at temperature 60-90C. During perforation of well, value of technological liquid hydraulic column above productive bed ceiling is taken equal to (1.03-1.07)-(1.05-1.1)Pb, where Pb - productive bed pressure. Water solution of carnallite ore is used at density 1.23-1.37 t/m3. During use of said solution as working body of force wells it is used at density 1.05-1.20 t/m3, and solution also contains swelling inhibitor for argillaceous component of oil and gas bearing bed, like oxyethylenedendiphosphone acid, in amount 0.05-0.15% of used dissolved ore mass.

EFFECT: higher efficiency.

1 cl, 4 ex

FIELD: oil industry.

SUBSTANCE: method includes treatment of face area of oil bed by hydrophobic agent in organic solvent and pressing oil from collector with following delivery of oil from face area of product well for treatment of oil terrigenic bed, in form of hydrophobic agent solution of ethylene copolymer with vinylacetate in ethylbenzol or fraction thereof is used in relation 1:1 - 10, treatment of face area is performed with following ratio of components, in percents of mass: ethylene copolymer with vinylacetate 0.05-2.0, ethylbenzol or fraction 0.05-20.0, organic solvent - the rest.

EFFECT: higher efficiency.

2 tbl, 2 ex

FIELD: mining industry and alternative fuels.

SUBSTANCE: coal is affected by methanogenic consortium of microorganisms with culture medium utilizing continuous pumping of culture medium through wells and tank wherein methanogenic consortium of microorganisms with culture medium is placed. Tank is installed on the surface above wells and pumping of culture medium from the bottom of tank through methanogenic consortium of microorganisms. Process produces biogas and coal-water fuel.

EFFECT: increased yield of biogas to continuously effecting culturing of microorganisms.

1 dwg, 2 tbl

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