Method for performing explosion in well during its perforation or processing of well-adjacent zone

FIELD: oil and gas industry.

SUBSTANCE: method includes placing an explosive device in a well in working gas-liquid substance, occupying also the volume of well below perforator and above it at distance 10-300 meters. At upper mark of gas-liquid substance viscous-resilient liquid is placed with height of hydrostatic column 10-50 meters. Above viscous-resilient liquid main volume of gas-liquid substance is placed with relation of gas and liquid therein being less, than in working gas-liquid substance below viscous-resilient liquid. Density of main volume of gas-liquid environment is taken for calculation of forming of necessary depression in well shaft. With that depression, after gathering of structural viscosity by viscous-resilient liquid, explosion is performed.

EFFECT: higher efficiency.

14 cl, 1 ex

 

The present invention relates to the field of oil and gas industry and, in particular, to the explosive in the borehole at its perforation or enhanced recovery of hydrocarbons, for example, with application of pressure generator to apply hydraulic-gas explosion rocks or termoliticheskogo impact on bottom-hole zone of the well.

It is known that when carrying out the explosion in the well formed by the shock wave of large magnitude, which, acting on the casing extends in the wellbore fluid up and down from the interval Bang. This causes a casing shear deformations and vibrations, disrupting the integrity of the annulus cement and forming a longitudinal cracks, leading to cross flow.

There are a number of technical solutions aimed at reducing the negative impact of the explosion in the well.

Known methods of implementation explosion in the well when her punching, aimed at lowering clogging steps, at different ratio of reservoir pressure and bottom hole pressure in the well, such as perforation, depression, or repression, or when the equilibrium state of the well. A specific variant of the perforations is selected depending on the geological conditions in the well.

A known way of making adult the VA in the well when the perforation, when the perforation is carried out with a depression in the reservoir at the time of perforation than provide takeaway in well clogging particles (see, for example, USSR author's certificate No. 1520917, CL E 21 In 43/11, 27.11.1996).

The disadvantage of this method is the absence of measures to ensure the safety lining wells and complexity of activities to create a depression in the wellbore exactly at the time of perforation.

A known method for making an explosion in the well with its perforations, which provide compensation explosive shock wave (see, for example, USSR author's certificate No. 1593329, CL E 21 In 43/117, 15.01.1994).

The disadvantage of this method is that it only compensates the explosive pressure pulse with a period of validity of not more than 10 MS. In addition to this impulse in the explosion there is a break in the continuity of the fluid in the borehole and the rise of the liquid column above the interval Bang and up until the explosion energy will not be consumed completely. After that, the liquid column is free to fall with the formation of water hammer. In the hydraulic shock in addition to the further destruction of the casing cement is increased pollution of the productive formation through the already formed perforation tunnels. At the same time, the impact of water hammer is 500 MS. is therefore clogging and damaging effects of water hammer ten times the explosive action of the pressure pulse.

The present invention is directed to an integrated solution to prevent multiple negative phenomena accompanying explosion in the well.

This explosion in the framework of this invention are considering at different speeds of development, which include combustion (e.g., typical, typically, the pressure generator), which is characterized as an explosion, but only when the other (minimum) dynamics of its development.

The technical result of the invention is to increase the efficiency of the method by reducing sedimentation of the reservoir, compensation explosive pulse pressure, prevent water hammer, reducing time to completion and increase the inflow into the well of hydrocarbons while reducing the risk of flooding.

Required technical result is achieved by a method for making an explosion in the well when her punching or machining of critical area includes accommodation in a well of an explosive device in the working gas-liquid environment, occupying a volume well below the perforator and above him, in the distance 10-300 m, placement at the top mark gas-liquid medium is viscoelastic fluid with the height of the hydrostatic column of 10-50 m and placement above the viscoelastic fluid of the main volume of gas-liquid environment to what utmostly it gas less than the working gas-liquid environment under a viscoelastic fluid, the density of the main volume of gas-liquid environment is the rate of creating the necessary depression in the wellbore, in which, after a set of structural viscosity viscoelastic fluid, carried out the explosion.

In addition:

as the working gas-liquid environment take a gas-liquid environment with a ratio of 3.2÷4,3 (the best option);

as a viscoelastic fluid take-based liquid, for example, polyacrylamide;

the explosive device in the borehole place, for example, on the tubing. If this method does not exclude the possibility of placing an explosive device on the cable;

gas-liquid environment and a viscoelastic liquid is placed in the borehole, for example, after placing an explosive device. The method does not preclude the placement of a gas-liquid environment and viscoelastic fluids in the well prior to placing an explosive device;

as the gas phase for gas-liquid environment take, for example, nitrogen gas or associated gas, or carbon dioxide gas, or exhaust gas of the internal combustion engine, or a mixture of gases in various combinations;

as a liquid phase to a gas-liquid environment take, for example, drilling mud or water, or an aqueous solution behavior is chestno-active substances, or oil, or diesel fuel;

gas-liquid environment is prepared, for example, in advance before placing it in the borehole;

gas-liquid environment get in the well by mixing the liquid and gas phases;

use self-evolving gas-liquid environment;

to ensure imagineimagine gas-liquid environment using, for example, urea, nitrite, alkali or alkaline earth metal initiator reaction - pinacolato, surfactant and water;

to stabilize the gas-liquid environment using, for example, carboxymethyl cellulose or polyacrylamide;

when the explosive perforating the walls of the well reveal the total cross section of the holes is not less than 30% section of the wellbore to its length in 1 tap. m;

when processing the near-well zone of the explosion for enhanced recovery of hydrocarbons existing control the degree of opening of the productive formation and penetration of less than 30% section of the wellbore to its length in 1 tap. m increase its gentle - non-explosive perforation to the degree of opening of not less than 30% of the cross section of wellbore length in 1 tap. m

The essence of the invention lies in the fact that 80% of the explosion energy is distributed in the wellbore. Without protective measures in this barrel explosion produces a fracture in the wellbore and cement annulus is the space. In the area of the most active of the explosion (usually it is 10-300 depending on the power of the explosion and the type of explosive device) gas-liquid environment, in the optimal case of multiplicity in her gas 3,2÷4,3, having non-Newtonian properties, provides compensation as an explosive pressure pulse (due to compression), and hydraulic shock (due to inhibition of the column of well fluid or prevent its acceleration with acceleration. Moreover, the non-Newtonian properties of the working gas-liquid environments provide a kind of hydraulic seal in the wellbore due to the structural properties of gas-liquid medium at a predetermined ratio and reducing the pressure in the shock front. Moreover, the smaller the acoustic stiffness of the working gas-liquid environment in comparison with the acoustic stiffness of the main volume of liquid medium (above viscoelastic fluid), provides a reflection of shock waves, stopping her work on the acceleration of the liquid column and its faster decay in less harsh acoustic environment. Viscoelastic liquid, placed on the border of the reflection of the shock wave and having the most pronounced non-Newtonian properties, provides practically Petrovna well at the top of the active actions of the explosion. In place of the reflection of the shock wave viscoelastic liquid is ity acquires additional pokerwise properties and provides the initial compensation of the reflected shock wave.

All this, in General, contributes to the preservation of the lining of wells in the active area of the explosion and provides simultaneous localization energy of the explosion in the zone of the reservoir. When the explosive perforating the reservoir, provided its total opening cross-section of the perforation holes not less than 30% section of the wellbore 1 POG. m of its length, as if becomes "transparent" to receive the energy of the explosion, which further consumes to create extended channels directly in the reservoir.

In the final extent of the pore channels or channels perforations are cleaned during the development wells. To do this, first destroy the structure of viscoelastic liquids, such as chemical reagents. After removing the liquid straddle packer in the well bore connects the flotation ability of the gas-liquid mixture with removal of the well bore residues of contaminants from the pore channels of the productive formation or perforation channels.

The method is as follows.

In a well placed explosive device in the working gas-liquid environment, occupying a volume well below the perforator and above him, in the distance 10-300 meters At the top mark gas-liquid medium is placed viscoelastic fluid with the height of the hydrostatic column of 10-50 m Above viscoelastic fluid R is smashout the main volume of gas-liquid medium with a ratio of gas and liquid, less than the working gas-liquid environment under viscoelastic fluid density, providing the necessary depression in the wellbore. When this depression carry out the explosion in the well. When this explosion exercise also provided a set (after dialing) structural viscosity viscoelastic fluid.

A specific example of implementation of the method.

The explosion in the well conducted, for example, by perforation. To do this in a production well down, for example, tubing explosive perforator, for example, cumulative. Original punch set below the productive formation of the conditions of possibility of injection through the tubing of the working gas-liquid medium below the perforated interval, for example, on 40 meters This value is chosen taking into account the power of the explosion. Working gas-liquid environment with a multiplicity of, for example, 3,5 pump with reserve to the extent that the placement of this medium in the well above the perforated interval 70 m Then punch set against the reservoir. Open in the tubing string and casting holes, for example, 60 m above the punch, carry through them rinse the wells with a "shortcut" over-pumped gas-liquid environment. After that, through these same holes pumped main volume of gas-liquid medium with a ratio of 2.8, which fill the rest of the wellbore. This environment forced viscoelastic fluid, for example, on the basis of polyacrylamide. This liquid is the rate of filling 50 m wells in the volume of the tubing of the column and the annular space of the well on its height. In the end, in this arrangement the gas-liquid mixture in the bore of the latter is depressed relative to the normal hydrostatic pressure or Plast pressure. Maintain the borehole within 24 hours for a set of structural viscosity of the viscoelastic fluid. Then carry out the perforation hole and the undermining of charge perforator. Placing in the borehole liquid medium at the set interval and viscoelastic fluid explosion has minimal damaging impact on the length of the wellbore and does not cause ejection of the well fluid on the mouth. Explosion in conditions of depression eliminates the clogging of the productive formation. After the explosion, the tension of the tubing of the column and subsequent axial movement of the column destroy the structure of the viscoelastic fluid. If necessary, this speed up the pumping of well-known chemicals that destroy the structure of the viscoelastic fluid. As a result, the wellbore is after the explosion under depression. Due to F. tatiannah liquid properties, filling the borehole, provide treatment of the pore channels of the productive formation and/or perforation holes from clogging of the particles.

As a result, the method provides a reduction of sedimentation of the reservoir, compensation explosive pressure pulse, preventing water hammer. In addition, reduced time to completion and increase inflows into the well of hydrocarbons while reducing the risk of flooding.

1. Method for making an explosion in the well when her punching or machining of critical area, including the placement of downhole explosive device in the working gas-liquid environment, occupying a volume well below the perforator and above him, in the distance 10-300 m, placement at the top mark gas-liquid medium is viscoelastic fluid with the height of the hydrostatic column of 10-50 m and accommodation above viscoelastic fluid in the main volume of gas-liquid medium with multiplicity in her gas is lower than in the working gas-liquid environment under a viscoelastic fluid, the density of the main volume of gas-liquid environment is the rate of creating the necessary depression in the wellbore, in which after a set structural viscosity viscoelastic fluid carry out the explosion.

2. The method according to claim 1, characterized in that as a working gazozhidkostnoi the th environment take a gas-liquid environment with a ratio of 3.2 and 4.3.

3. The method according to claim 1 or 2, characterized in that as viscoelastic liquids take the liquid on the basis of polyacrylamide.

4. The method according to claim 1, characterized in that the explosive device in the well, place the tubing.

5. The method according to claim 1, characterized in that the gas-liquid environment and a viscoelastic liquid is placed in the hole after placing an explosive device.

6. The method according to claim 1, characterized in that the gas phase for gas-liquid environment take nitrogen, or gas, or carbon dioxide gas, or exhaust gas of the internal combustion engine, or a mixture of gases in various combinations.

7. The method according to claim 1, characterized in that the liquid phase to a gas-liquid environment accept drilling fluid, or water, or an aqueous solution of surface-active substances, or oil, or diesel fuel.

8. The method according to one of claims 1, 5-7, characterized in that the liquid medium is prepared in advance before placing it in the well.

9. The method according to one of claims 1, 5-7, characterized in that the gas-liquid environment get in the well by mixing the liquid and gas phases.

10. The method according to one of claims 1, 5-7, characterized in that use self-evolving gas-liquid environment.

11. The method according to claim 10, characterized in that to ensure imagineimagine g is suidcontrol environment using urea, nitrite, an alkaline or alkaline earth metal initiator reaction - pinacolato, surfactant and water.

12. The method according to claim 11, characterized in that in order to stabilize the gas-liquid environment using a carboxymethyl cellulose or polyacrylamide.

13. The method according to claim 1, characterized in that when the explosive perforating the walls of the well reveal the total cross section of the holes is not less than 30 % section of the wellbore to its length in 1 tap. m

14. The method according to claim 1, characterized in that the processing of the near-well zone of the explosion for enhanced recovery of hydrocarbons existing control the degree of opening of the productive formation and penetration of less than 30 % section of the wellbore to its length in 1 tap. m increase its gentle - non-explosive - perforation to the degree of opening of not less than 30 % of the cross section of wellbore length in 1 tap. m



 

Same patents:

FIELD: oil-and-gas field development.

SUBSTANCE: method involves forming continuous disc-shaped slot in well by successive blasting gunpowder charges along with increasing power thereof in trinitrotoluol equivalent from explosion set to explosion set as slot length increases and strengthening the slot. The slot is formed so that aperture and radius thereof are related by analytical correlation.

EFFECT: increased ability of oil and gas extraction.

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FIELD: oil and gas industry.

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EFFECT: higher efficiency.

1 tbl

FIELD: oil industry.

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EFFECT: higher reliability and efficiency.

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FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

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FIELD: oil and gas extractive industry.

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FIELD: oil and gas industry.

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EFFECT: higher reliability, higher efficiency.

7 cl, 5 dwg

FIELD: mining industry.

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FIELD: oil and gas industry.

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EFFECT: broader functional capabilities, higher efficiency.

3 dwg, 1 ex

FIELD: oil and gas industry.

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2 cl, 2 dwg

FIELD: oil and gas industry.

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EFFECT: higher reliability, lower costs.

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EFFECT: produced shaped-charge facing with a uniform, high density and various configurations.

24 cl, 1 dwg

Perforator charge // 2250359

FIELD: oil industry.

SUBSTANCE: charge has axial-symmetrical explosive charge case, open hollow in form of spherical segment in body of charge, detonator and two-layer casing of hollow, made with inner diameter of base d, equal to 0.8-0.85 of charge base diameter D. two-layer casing is made with concave portion along axis equal to 0.30-0.35 d. inner layer of casing directed to hollow consists of material with lesser specific mass, of for example aluminum, and outer casing layer, directed to explosive charge is made of material with greater specific mass, for example, copper with thickness, equal to 0.030-0.035 d. relation of specific masses of inner and outer casing layers is within limits 0.15-0.23 and, respectively, relation of their thicknesses equals 0.5-0.8.

EFFECT: higher efficiency.

1 dwg, 1 tbl

FIELD: mining industry.

SUBSTANCE: method includes detonation of first perforation cannon plant, positioned outside from casing pipe in well, as a result casing pipe and first underground formation are perforated. One or more stimulating and/or effecting substances is injected through casing pipe into first underground formation. Second perforation cannon plant is detonated, positioned outside casing pipe in well. As a result said casing string and second underground formation are perforated. One or more stimulating and/or effecting substances is injected through casing pipe into second underground formation. First underground formation is isolated from injection of flowing substances prior to injection of one or more stimulating and/or effecting substances into second underground formation. First and second perforation cannon plants are cemented in underground well prior to detonation. First underground formation is isolated from injection of flowing substances after injection of one or mote stimulating and/or effecting substances through casing pipe into second underground formation. Explosive substance is set on fire by detonation of at least one explosive charge by control line, placed in underground well outside of said casing pipe and connected to at least one explosive charge. Completion system has casing pipe, at least two perforation cannons, connected to outside of casing pipe. Each perforation cannon has at least one explosive charge, targeted in direction of casing pipe. Also provided is device for isolating a zone, positioned between at least two perforation cannons for selective overlapping of flow through casing pipe. Outside the casing pipe a plant for sending signals to perforation cannons is positioned.

EFFECT: higher efficiency.

2 cl, 40 dwg

FIELD: mining industry.

SUBSTANCE: device has collapsible body of at least two portions. These are held relatively to one another, have a combined axial channel and together form a hermetic ring-shaped hollow. Therein a ring-shaped cumulative charge is placed with pressed explosive substance in metallic case in form of a torus, having outer ring-shaped recess. Opposite to the latter body is made with lesser thickness of outside wall. Body has at least one inner radial channel, connecting ring hollow to axial channel. In this axial channel a means for initiating ring-shaped cumulative charge through radial channel is positioned. Portions of body are mated by ends adjacently to each other and made with possible exclusion of strains from axial loads in zone of outer wall of decreased thickness under well conditions.

EFFECT: higher reliability and efficiency.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has body, wherein a working body source is placed in form of a set of solid fuel charges with different abrasive particles and nozzle block with nozzles in amount of no less than three in one horizontal cross-section. Nozzle block is paced between two working body sources placed adjacently to each other by burning surfaces. These are made in form of cylinders, armored along side surface and end. End is directed to device body. Nozzles of nozzle block are hermetically plugged with plugs. Plugs are made of solid fuel with their possible combustion when reaching pressure as a result of burning of working body sources, which provides for working parameters of burning product jet from nozzles.

EFFECT: higher efficiency.

3 cl, 4 dwg

FIELD: oil and gas extractive industry.

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EFFECT: higher reliability.

2 cl, 6 dwg

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