The way of the development of oil deposits

 

The invention relates to the oil industry, in particular to methods for development of oil deposits, presents a mixed layers. The technical result is to increase oil recovery and reduce water cut wells at the late stage of exploitation of the deposits. In the way of the development of oil deposits, including the injection of an aqueous solution of sodium silicate and suspensions of zeolite-containing rocks, pre-treated with hydrochloric acid, carrying out technological exposure and injection of the displacing agent, optionally inject an aqueous solution of cellulose ether, as well as the displacing agent use water or an aqueous solution of surfactants. Mainly the injection of aqueous solutions of the cellulose ether and sodium silicate, suspensions of zeolite-containing rocks, pre-treated with hydrochloric acid, carried out simultaneously or sequentially. 1 C.p. f-crystals, 1 table.

The invention relates to the oil industry, in particular to methods for development of oil deposits, presents a mixed layers, and can be used to enhance oil recovery and B development of oil reservoirs, primarily on late-stage operation, involving the sequential injection of polymer solutions of a class of polyacrylamide, alkali and salt two - or trivalent metals (see RF patent 2103491, MKI E 21 In 43/22, publ. 1998).

This method is not effective enough due to the degradation of polymer molecules under the action of the salt formation and injected water, reduce the viscosity due to the polymer adsorption on the surface of pores.

A method of processing oil fields by injection of an aqueous solution of anionic polymer, an inorganic or organic acid, soluble in water, to bring the pH from 0.5 to 2.5, liquid glass, and salts of polyvalent metal (see RF patent 2112873, MKI E 21 In 43/22, publ.1998).

This method is not effective enough due to the degradation of polymer molecules in saline waters and insufficient viscosity formed in the layer system due to the loss of cross-linking agent on the formation rock. Also, when using as a crosslinking agent salts of CR+3disturbed the ecological situation in the oil producing region.

The closest in technical essence and the achieved effect is the way of the development of oil deposits, including sakacc the hydrochloric acid with subsequent technological exposure (see RF patent 2157451, MKI E 21 In 43/22, publ. 1999).

The known method is not effective enough due to the low viscosity of the resulting reservoir system and breakthrough capabilities of water in highly permeable formation at high pressure injection.

The present invention is to create an effective method of oil production, allowing to increase oil production and reduce production watercut by effectively blocking high permeability zones of the reservoir, increasing the coverage of deposits by impact and improve their cleaning oil from the pore space in the presence of deposits in waters of different salinity.

The problem is solved by creating a way to develop oil fields, including the injection of an aqueous solution of sodium silicate and suspensions of zeolite-containing rocks, pre-treated with hydrochloric acid, carrying out technological exposure and injection of the displacing agent, optionally inject an aqueous solution of cellulose ether, as well as the displacing agent use water or an aqueous solution of surface-active substances.

Mainly the injection of aqueous solutions of the cellulose ether and sodium silicate, suspension zeolite>/p>For technology use, for example, as a cellulose ether: - acetylcellulose on THE 6-55-221-565-88; carboxymethylcellulose on THE 6-55-221-1453-96; - alfacell - soluble hydroxyethylcellulose mark 1 or 2 on THE 6-55-221-1473-97.

Sodium silicate obtained by melting quartz sand and soda ash, take GOST 13078-81, hydrochloric acid according to GOST 3118-77.

Zeolite-containing rock is a sedimentary rock with a content of from 4 to 95% of microporous zeolites and consists of associated minerals such as field peshat, quartz, mica, clay. Zeolite is a aluminosilicates, mainly CA or Na (see the Provisional guidelines on exploration and evaluation of zeolite-containing rocks. - Kazan: NIEGAARD, 1990).

For the preparation of suspensions of zeolite-containing rock pour hydrochloric acid solution and leave for 0.5 to 1.0 hours to respond. Hydrochloric acid take 0,5-3,0% concentration.

When exposed to zeolite breed hydrochloric acid reacts with separation in a solution of salts, which geleobrazovanie.

After injection into the watered heterogeneous reservoir through the injection schwarzenau acid, mostly penetrating into the highly permeable zones of the formation, the formation of a viscous gel-like structured system due to several factors.

First, it increases the viscosity of the polymer solution in an alkaline environment, and secondly, there is a structuring of polymer molecules and sodium silicate ions 3-valent metals, selected hydrochloric acid of the zeolite-containing rocks and, thirdly, the adsorption of this gel-like mass on the particles of the zeolite. Educated viscous structured system retains its properties in fresh and saline waters due to the stability of the molecules of the cellulose ether, freely filtered in the high permeability zones of the reservoir and is not diluted by the flow of injected water or surfactant solution.

Change the filtration resistance in highly permeable zones of the reservoir leads to an increase in coverage of the reservoir effect of the injected water or aqueous surfactant solution.

A new set of declared essential features allows you to get a new technological result, namely to increase the recovery of oil through the efficient development of oil deposits.

Analysis of the known solutions selected in the search process, showed that in science and technology no obsoleet to make a conclusion on the conformity of the declared object of the criteria of "novelty" and "inventive step".

The way in industrial conditions is as follows.

In flooded oil reservoir through injection or extraction wells pumped by the pump unit aqueous solution of cellulose ether 0.5 to 2.0% concentration aqueous solution of sodium silicate 1,0-5,0% concentration and the suspension of zeolite-containing rocks, pre-obrabatyvat hydrochloric acid 2,0-8,0% concentration. The volume ratio between the aqueous solution of the cellulose ether and the suspension of zeolite-containing rocks is 1:1, respectively.

Injection of the reagents carried out simultaneously or sequentially cyclically alternating fringes. Spend 2-6 cycles of treatment, the volume amounts of injected reagents depends on the specific injectivity of wells and the thickness of the layer and is 0.1-0.3. Conduct technology shutter speed of at least 3 nights. The time depends on the geological and physical characteristics of the deposits. Next, download the displacing agent is water or an aqueous surfactant solution.

When the injection of the reagents through the injection well to the formation of viscous structured system occurs in highly permeable zones of the reservoir, this leads to increased coverage of the oil reservoir effect, and when pumping through datoka to the well and reduce the water content of produced fluids.

Evaluation of the effectiveness of the proposed method and the prototype method is carried out in laboratory conditions on the growth rate of oil recovery.

Studies conducted on the reservoir model consisting of two parallel glass tubes with a common entrance, filled with quartz sand (particle size of quartz sand filled in a manner to simulate the seams with great heterogeneity. The model layer is saturated with water of different salinity and determine the permeability for water. After that, the model is saturated with oil, determine the recovery factor in the displacement of oil by water. The displacement of oil from the reservoir spend mineralized water to almost full of water production from high-permeability of the formation model.

Example 1 (the proposed method).

In the layer model, the saturated water with a salinity of 150 g/l, at the same time inject a 1.0% aqueous solution alfacell mark 1 with the addition of 1.0% aqueous solution of sodium silicate, zeolite suspension breed of 5.0% concentration, pre-treated 3,0% solution of hydrochloric acid, in the form of 3 identical cycles in the amount of 0.28 Vthen. Conduct exposure for 3 days. The annual growth rate of oil recovery in the expulsion of the ub>9-12 - 27,8% (see table., example 1).

Example 2.

In the layer model, the saturated water with a salinity of 150 g/l, consistently upload a 2.0% aqueous solution of acetylcellulose, a 5.0% aqueous solution of sodium silicate and 2.0% suspension of zeolite-containing rocks, pre-treated with 0.5% solution of hydrochloric acid in the form of 6 identical cycles in the number of 0.27 Vthen. Conduct exposure for 5 days. The annual growth rate of oil recovery when the displacement of oil by water is to 30.5%, and when the displacement of oil in an aqueous solution of surfactant - oil sulfonate is 33.5% (see table., example 2).

Example 3.

In the layer model, the saturated water with a salinity of 270 g/l, consistently upload a 5.0% aqueous solution of sodium silicate, 0.5% aqueous solution of carboxymethylcellulose and 8.0% suspension of zeolite-containing rocks, pre-treated with 1.0% solution of hydrochloric acid, in the form of 3 identical cycles in the amount of 0.3 Vthen. Conduct technology exposure for 5 days. The annual growth rate of oil recovery when the displacement of oil by water is 26.7%, and when the displacement of oil by water solution of surfactant OP-10 is 29.7 per cent (see table., example 3).

Example 4.

In the layer model, the saturated water with mine is Tannoy a 3.0% solution of hydrochloric acid, a 2.0% aqueous solution alfacell grade 2 and 5.0% aqueous solution of sodium silicate, in the form of 2 identical cycles in an amount of 0.1 Vthen. Conduct technology exposure for 3 days. The annual growth rate of oil recovery when the displacement of oil by water is 24.4%, while the displacement of oil by water solution of surfactant OP-10 is 26.8 per cent (see table., example 4).

Example 5 (a known way).

In the layer model, the saturated water with a salinity of 150 g/l, consistently upload a 5.0% aqueous solution of sodium silicate and 5.0% suspension of zeolite-containing rocks, pre-treated with 1.0% solution of hydrochloric acid in the amount of 0.15 Vthen. The treatment is carried out in 2 cycles. Conduct technology exposure for 3 days. The annual growth rate of oil recovery when the displacement of oil by water is 23,6% (see table., example 5).

Applying the proposed method to increase the recovery factor on average by 3.2 and 29.6%, to successfully develop heterogeneous permeability, water, fractured oil reservoir without disturbing the ecological situation in the oil producing area.

Claims

1. The way of the development of oil deposits, including Tannoy hydrochloric acid, conducting technological shutter speed and the injection of the displacing agent, characterized in that it further inject an aqueous solution of cellulose ether, as well as the displacing agent use water or an aqueous solution of surface-active substances.

2. The method according to p. 1, characterized in that the injection of an aqueous solution of cellulose ether, a water solution of sodium silicate and suspensions of zeolite-containing rocks, pre-treated with hydrochloric acid, carried out simultaneously or sequentially.

 

Same patents:

The invention relates to the oil industry and can be used in the development of irrigated oil collectors

The invention relates to the oil industry, in particular to compositions for increasing oil production in the oil fields

The invention relates to the oil industry, and in particular to methods of regulating the development of oil reservoirs with carrying out insulation works to align the profile of the injection and reduce water production to producing wells

The invention relates to the oil industry and can be used for processing bottom-hole formation zone, to increase coverage of deposits by the impact of the alignment of the displacement front and Tootmine residual oil from the reservoir
The invention relates to methods of treatment of industrial wastewater and can be used in mining and processing enterprises

The invention relates to the oil industry and can be used in the development of heterogeneous permeability reservoirs

The invention relates to the oil industry and can be used to limit and isolate the flow of formation waters in the wells in the oil field development

Nagakura liquid // 2213213
The invention relates to the oil and gas industry and can be used in the operation of oil and gas wells

The invention relates to the oil industry, namely to slit the development of oil fields

The invention relates to the oil industry, in particular to compositions for increasing oil production in the oil fields

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.

7 cl, 5 dwg

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

Up!