Method for preserving collecting properties of face-adjacent area of productive bed of oil-extractive well

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 60-90°C. 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

 

The invention relates to the oil and gas industry in terms of industrial exploitation wells and may find application in various technological operations in wells, and in particular the killing of wells, perforations, washing, etc.

There is a method of preservation of reservoir properties of the bottomhole zone of the reservoir oil and gas wells when they are killing using killing fluids based on water solutions of mineral salts, mainly chlorides and bromides of sodium, potassium, calcium, zinc, etc. individually or in various combinations [1].

However, application of this method leads to an increase in the completion time in the subsequent period and the decrease of their production due to the poor preservation of reservoir properties of the bottomhole zone of the reservoir.

There is also known a method of saving the reservoir properties of the bottom-hole zone of the reservoir oil and gas wells decline in reservoir pressure at 5-10% below the hydrostatic and subsequent fill the reservoir with water [2].

The disadvantage of this method is the large loss of oil during the whole period of declining reservoir pressure at the site of the development not only of the wells, but also from other oil and gas wells located on this phase is.

There is also known a method of saving the reservoir properties of the bottom-hole zone of the reservoir oil and gas wells by stimulation with aqueous solutions of salts with the addition of surface-active substances (surfactants), such as the brand of the TRS-1 [3].

The disadvantage of this method is the reduction of the effectiveness of a surfactant with increasing temperature, and the temperature of the reservoir above 60°With the effect of surfactants is not shown.

Another known way of preserving the reservoir properties of the bottom-hole zone of the reservoir oil and gas wells is pumped into the well against the seam portions inverse emulsion of hydrocarbon and aqueous bases, the latter of which contains a surfactant and a water-soluble salt of one or more species, followed by exposure of the emulsion in the well for ~12 h, the injection into the well above the portion of the inverse emulsion process fluid based on the aqueous solution of soluble salts of one or more species, and hydrocarbon based inverse emulsion and oil displace [4].

The disadvantage of this method is that the result in establishing the ability to retain the capillary-trapped water in the hydrophilic reservoir is blocked the oil flow into the well from the low permeability zones of the reservoir and thus lose the Xia reservoir properties of the bottomhole zone.

Closest to the claimed technical solution in its essence and the achieved technical result is a way of preserving the reservoir properties of the bottom-hole zone of the reservoir oil and gas wells, wherein the well bore is injected aqueous solution enriched sylvinite ore precipitation inhibitor, and an aqueous solution of sylvinite ore is placed against the zone of the reservoir and above the roof it with the formation of the hydraulic column. The process liquid on this technical solution also contains the target additives, corrosion inhibitors, thickeners, etc. [5].

The disadvantage of this method is a significant reduction in reservoir properties of the bottom-hole zone of the reservoir or very long (up to several months) the duration of the relaxation of these properties to the original level after the necessary technological operations in the well.

The technical result of the invention is to improve the effectiveness of conservation reservoir properties of the bottom-hole zone of the reservoir of the production well using aqueous solutions of mineral salts as the primary means of stimulation while maintaining its reservoir properties. Another technical result of the invention t is aetsa improving the injectivity of the reservoir when process fluid according to this invention in the injection wells.

Required technical result is achieved in that in the method of saving the reservoir properties of the bottom-hole zone of the reservoir oil and gas wells, including location in the wellbore an aqueous solution of mineral salts with the addition of a precipitation inhibitor, corrosion inhibitor and other special additives and holding in the well, according to the invention in a wellbore is placed aqueous solution of native, modified or enriched carnallite ore or mixtures thereof, and use an aqueous solution of the above-mentioned modifications carnallite ore with a maximum downhole temperature conditions, the concentration and the solution is injected in an amount necessary and sufficient for the formation of the hydraulic column in the wellbore above the roof of the reservoir, and for the rest of the height of the trunk well before the mouth is filled with water. Using either native carnallite ore or modify it to content, wt.%:

potassium chloride 24-25

sodium chloride 5-6

magnesium chloride 31-33

water of crystallization else

or enrich its content, wt.%

potassium chloride 23,0-29,5

magnesium chloride is 31.8-46,0

water of crystallization else

When the perforation hole size hydraulic post process fluid is STI above the roof of the productive formation increased by 3-7% of the known (1,05-1,1)P PLwhere RPLthe pressure in the reservoir.

When killing the well pump solution of native, modified or enriched carnallite ore or their mixtures with a maximum downhole temperature conditions concentration in an amount necessary and sufficient for the formation of the hydraulic column in the wellbore above the roof of the reservoir, and the rest of the height of the trunk well before the mouth is filled with water.

Using a solution of native, modified or enriched carnallite ore or their mixtures as the working fluid injection wells in it enter inhibitor of swelling clay component of oil and gas reservoir, for example ethylenediaminetetramethylene acid (EDTP) in an amount of 0.05 to 0.15 wt.% from the content of carnallite ore.

Using a solution of native, modified or enriched carnallite ore or their mixtures as the working fluid injection wells the concentration of the latter is supported within, providing the density of a solution of 1.05-1.20 tons/cubic meters

When perforation and killing of wells use a solution of native, modified or enriched carnallite ore or mixtures thereof with the target additives corrosion inhibitors, inhibitors of precipitation, surfactants and other

Water rest the R native either modified or enriched carnallite ore or mixtures thereof prepared by dissolving the latter in fresh technical, wastewater from treatment plants oil or formation water.

In the preparation of a solution of native or modified or enriched carnallite ore dissolution in formation water last pumped from the well with a temperature of 60-90°C.

As an inhibitor of swelling clay component of the hydrocarbon-bearing formation using EDTF in the amount of 0.05 to 0.15% by weight of dissolved carnallite ore.

As the precipitation inhibitor use nitrilotriethanol acid (NTF) in an amount of from 0.01 to 0.05% by weight of dissolved carnallite ore or snpch-M (the product of the interaction oksietilidendifosfonovaya acid with an aqueous solution of ammonia and high boiling fractions of petroleum products).

As the surfactant used for example “Lionel AF 9-12 or ML-80.

As water-soluble mineral salts use native carnallite ore composition, wt.%:

potassium chloride is 20.5 and 21.5 in

sodium chloride was 19.5-22.5 to

magnesium chloride 24,0-27,0

water of crystallization else

or modified carnallite ore composition, wt.%:

potassium chloride 24-25

sodium chloride 5-6

magnesium chloride 31-33

water of crystallization is the rest

either enriched carnallite ore composition, wt.%:

potassium chloride 23,0-29,5

magnesium chloride is 31.8-46,0

water of crystallization else

Modify or enrich carnallite ore, using the natural properties of the difference of solubility of the constituents of the ore salts - chlorides of sodium, magnesium and potassium. When modifying or enriching native carnallite ore insolubles mostly removed, which significantly improves the quality of the performance of the product when using it as a key component of process liquids oil and gas wells.

The essence of the invention.

The use of native, modified or enriched carnallite ore or mixtures thereof as a main component of process fluid during technological operations in oil and gas wells creates an exceptionally good opportunity to use cheap natural product for the preparation of aqueous solutions of mineral salts, virtually no polluting bottom-hole zone of the well in her technological operations or maintenance work. When it is determined that the penetration of such a process fluid in the reservoir permeability is not reduced, and in some cases even increased, which leads to the preservation of collectors the properties of the bottomhole zone of the reservoir.

Aqueous solutions of native or modified or enriched carnallite ore or mixtures thereof can be used in the secondary drilling formation of the perforation hole. In this case also ensures the safety of the reservoir properties of the bottom-hole zone of the reservoir.

Aqueous solutions of native, modified or enriched carnallite ore or mixtures thereof can be used as the working fluid in the injection wells during injection of a fluid into the formation of terrigenous last type may contain an inhibitor of swelling clay component of the reservoir. In both cases, is preserved and even increased permeability of the formation.

Despite the heat of hydration upon the dissolution of native or modified or enriched carnallite ore in the application of hot water (60 to 90° (C) water increases the rate of dissolution in 5-7 times and the density of the solution reaches a value of 1.23 to 1.37 tons/cubic meters

The method is as follows.

The process liquid (aqueous solution of native, modified or enriched carnallite ore or mixtures thereof) is prepared by known techniques sequential or simultaneous dissolution of the components in hot (60 to 90° (C) fresh technical, waste from installations preparation is oil and water or formation water. Technical fresh or waste water is heated, and in the preparation of the process liquid by dissolving the components in water reservoir last pumped from the well with a temperature of 60-90°C. Then, the thus prepared the process liquid is placed in the wellbore slightly lower against the zone and above the roof of the productive formation with the formation of the hydraulic column above the latter. Further, the wellbore to the mouth fill with fresh technical, waste from oil treatment plants and water or produced water. The magnitude of the hydraulic column, and accordingly the amount of the process liquid of high density on the basis of a solution of native, modified or enriched carnallite ore or mixtures thereof, is placed in the wellbore above the roof of the reservoir, take depending on the type of the process operations in the wellbore. As is clear from the description, these process steps may be killing the well, the suppression of neftegazopromyshlennoj, perforation, flushing of the borehole bottom, removing the downhole equipment for repair or replacement and other

When used in injection well density of process fluid is 1.05-1.20 tons/cubic meters

Example 1 a specific implementation of the method.

Technical data of SLE is gene: diameter of the production casing 146 mm, the current slaughter 1648 m, the volume of the production string 28 cubic meters, the reservoir pressure 186 ATM, the density of the reservoir fluid 1,09 t/cubic meter, the volume of extraction fluid 78 cubic meters/day (27 cubic meters of oil and 51 cubic meters of water).

Carry out killing the well with the following parameters.

Injection into the well of process fluid based on the aqueous solution of native carnallite ore in the amount of 23.5 cubic meters with a density of 1.31 t/cubic meter and the injection of technical fresh water to the wellhead in the amount of 4.6 cubic meters, then perform the manufacturing operation replacement of the pump and return the well to a working state (oil and gas). The volume of extraction fluid after killing 83 cubic meters (29 cubic meters of oil and 54 cubic meters of water).

Example 2 specific implementation of the method.

Technical data bore: the diameter of the production casing 146 mm, the current slaughter 1672 m, the volume of the production string of 28.2 cubic meters, the reservoir pressure 187 ATM, the density of the reservoir fluid 1,09 t/cubic meter, the volume of extraction fluid 76 cubic meters/day (25 cubic meters of oil and 51 cubic meters of water). Carry out killing the well with the following parameters.

Injection into the well of process fluid based on the aqueous solution of the modified carnallite ore in the number 23,0 cubic meters with a density of 1.32 t/cubic meter and the injection of technical fresh water to the wellhead in the amount of 5.3 cubic meters Next assests the ut technological operation flushing of the face and return the well to a working state (oil and gas). The volume of extraction fluid after killing 84 cubic feet (28 cubic meters of oil and 56 cubic meters of water).

Example 3 specific implementation of the method.

Technical data bore: the diameter of the production casing 146 mm, the current slaughter 1693 m, the volume of production casing 29 cubic meters, the reservoir pressure 188 ATM, the density of the reservoir fluid 1,09 t/cubic meter, the volume of extraction fluid 82 cubic meters/day (26 cubic meters of oil and 56 cubic meters of water).

Carry out killing the well with the following parameters.

Injection into the well of process fluid based on the aqueous solution enriched carnallite ore in the amount of 22.2 cubic meters with a density of 1.36 t/cubic meter and the injection of technical fresh water to the wellhead in the amount of 4.9 cubic meters Further perform the manufacturing operation perforation bottomhole zone and return the well to a working state (oil and gas). The volume of extraction fluid after killing 98 cubic yards (38 cubic meters of oil and 60 cubic meters of water).

Example 4 specific implementation of the method.

Technical data discharge hole: diameter of the production casing 127 mm, depth of injection, 1670 m, the pressure of 190 bar., the injection well is 85 cubic meters/day. Carry out the discharge process fluid based on the solution of a mixture of equal amounts of native and enriched carnallite ore with a density of 1.18 tons/cubic meters with the addition of 0.03% by weight dissolved the UDA inhibitor of swelling clay component layer EDTF. The injectivity of the reservoir has increased to 147 cubic m/day.

As can be seen from the description and examples of specific implementation of the method, the invention provides for the preservation of reservoir properties of the bottomhole zone of the reservoir oil and gas wells.

Sources of information

1. G.A. eagles and other Application of inverse emulsions in oil production. M.: Nedra, 1991, p.148 and forth.

2. RF patent 2096591, MCL E 21 In 43/02, publ. 1998

3. Zaripov SZ and other liquids to push the wells at their repair. M.: Nedra, 1981, p.45.

4. RF patent 2144332, MCL E 21 In 43/02, publ. 1999

5. RF patent 2169832, MCL E 21 In 43/02, publ. 2000 - the prototype.

1. The method of saving the reservoir properties of the bottom-hole zone of the reservoir oil and gas wells, including location in the wellbore an aqueous solution of mineral salts with additives inhibitor sludging and corrosion inhibitor, followed by the well of technological operations, characterized in that an aqueous solution of mineral salts in the wellbore is placed aqueous solution of native, modified or enriched carnallite ore or mixtures thereof, using a solution with a concentration of, for maximum downhole temperature conditions, and the solution is injected in an amount necessary and sufficient for images is of hydraulic column in the wellbore above the roof of the reservoir, and the rest of the height of the hole to mouth fill with water.

2. The method according to claim 1, characterized in that as the mineral salts used native carnallite ore composition, wt.%:

Potassium chloride is 20.5 and 21.5 in

Sodium chloride was 19.5-22.5 to

Magnesium chloride 24,0-27,0

Water of crystallization Else

3. The method according to claim 1, characterized in that as the mineral salts use a modified carnallite ore composition, wt.%:

Potassium chloride 24-25

Magnesium chloride 31-33

Water the Rest

4. The method according to claim 1, wherein the mineral salt is used enriched carnallite ore composition, wt.%:

Potassium chloride 23,0-29,5

Magnesium chloride is 31.8-46,0

Water of crystallization Else

5. The method according to claim 1, characterized in that hole to mouth fill with fresh water technical or waste water treatment facilities, oil and water or brine.

6. The method according to claim 1, characterized in that an aqueous solution of native, modified or enriched carnallite ore or mixtures thereof prepared by dissolving in fresh technical, waste from oil treatment plants and water or formation water with a temperature of 60-90°C.

7. The method according to claim 6, characterized in that in the preparation of a solution by dissolution in formation water the latter is Yuyu pumped from the well with a temperature of 60-90° C.

8. The method according to one of claims 1 to 5, characterized in that when the perforation hole size hydraulic post process fluid above the roof of the productive formation is equal to (1,03-1,07)×(1,05-1,1) PPLwhere RPLthe pressure in the reservoir.

9. The method according to one of claims 1 to 6, characterized in that when the perforation of the well or the suppression of neftegazopromyshlennoj use an aqueous solution of native, modified or enriched carnallite ore or their mixtures with a density of 1.23 to 1.37 t/m3.

10. The method according to one of claims 1 to 6, characterized in that when using an aqueous solution of native, modified or enriched carnallite ore or their mixtures as the working fluid injection wells, the latter is used at a density of 1.05-1.20 t/m3.

11. The method according to claim 10, characterized in that an aqueous solution of native, modified or enriched carnallite ore or mixtures thereof contains an inhibitor of swelling clay component-bearing layer, for example, ETF or NTF in the amount of 0.05 to 0.15% by weight of dissolved carnallite ore.



 

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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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