Device for propellant stimulation of well productive bed at well bottom zone

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device comprises several caseless channel-type solid-propellant charges of ballistic fuel collected by logging cable resting on end surfaces and extending through axial channel of all charges and fasteners. Simultaneous ignition of all charges is performed by two igniting charges arranged at the device ends. All charges featured charge length-to-channel diameter ratio of 50:1.Outer ends of igniting charges have parts arranged to rule out the logging cable twisting relative to said charges at device vertical lifting and lowering. Logging cable section extending through the channel of all charges and top charge similar-length section abutting thereon ate thermally isolated by Thiokol sealant. Inserts with outer surface coated anti-combustion composition are arranged at one of the ends of every charge. Blocks made of polymer sheet are glued to charge side surfaces.

EFFECT: higher efficiency of production.

2 cl, 5 dwg

 

The invention relates to the oil industry, and in particular to devices designed for thermobarometry processing bottom-hole zone of the reservoir wells to increase oil and gas by improving the filtration characteristics of the reservoir.

The number of known structures for thermobarometry processing bottom-hole zone of the reservoir. Their common feature is the presence of solid checkers (one or more), is lowered into the borehole using logging cable. These checkers are installed in the processing interval of the reservoir, ignited by means of an electric pulse applied to the wellhead by a geophysical cable. The positive effect is achieved by a complex impact on the reservoir - high pressure and high temperature created by burning charges. High pressure leads to fracturing in the form fracture, and the high temperature combustion products helps to remove paraffins and asphaltenes, pollutant formation, due to their melting point. The combination of these factors results in increased permeability of the formation.

A device for breaking the productive formation oil wells by the pressure of the powder gases with the purpose of intensification of oil production, containing the suspension and amennye it tubular workers and igniter solid elements (TTE), the attachment points them to the suspension (patent RU №2047744, MKI EV, 43/11, 43/26, 1992).

Analogues offer can be the following devices.

The gas generator for stimulation of oil and gas, including the powder tube armored charges placed underneath igniter charge, and carrying geophysical cable passing through the channels of TTE with elements of design (patent RU №2175059, C2, 06.10.1999), also known device for thermobarometry processing bottom-hole zone of the reservoir wells containing two solid-propellant charge consisting of a set of cylindrical channel checkers and igniter are connected to each other based on the end surfaces with the help of geophysical cable passing through the channel checkers, and fastening elements. The device is intended for complex effects on the producing formation of the well (patent RU 2235197, C2, 20.03.2004).

The closest device to the present invention is thermogenerator for processing bottom-hole zone of the reservoir oil wells (patent RU 2184220, C2, 10.08.2000 IPC EV 43/25), which was adopted for the prototype. Thermogenerator consists of a series of sequentially collected on a logging cable charges mixed solid fuel with a diameter of 70-100 mm with a Central channel with a diameter of 14-17 mm, tube, made isoluminance alloy and processreply with the powder composition, prisoners in soft combustible shell made of rubberized fabric and device Assembly. One of propellant charges is the igniter. The igniter is installed from below. The ignition of the powder charge thermogenerator comes from the filing with the remote at the mouth of the well logging cable electrical pulse to the heating element of the spiral that is installed in the igniter. Shipping thermogenerator in the treatment area is on the logging cable.

Long-term operation of thermogenerator revealed a number of significant drawbacks. Significant increase in the cost composite solid fuel led to the loss of competitiveness of these products. Low mechanical characteristics of the fuel make use of thermogenerator at temperatures above 150°C. High intensity device Assembly leads to contamination of the wells of the metal components remaining in it after actuation of thermogenerator. The presence of one igniter was insufficient to ensure a high level of reliability of ignition.

The technical task of the present invention is to increase the efficiency of the device, the ease of design and technology of its production, increase reliability, security, manufacturer and exploitation, reducing the cost, i.e. the creation of an effective, versatile device for use in oil and gas wells of different depths.

The technical result is achieved as follows.

Device for thermobarometry processing bottom-hole zone of the reservoir wells containing a number of open channel solid-propellant charges from ballistic fuel collected based on the end surface by means of the logging cable passing through the axial channel of all charges and fastening elements. Simultaneous ignition of all charges is provided by two flammable charges that are installed on the ends of the device, all applicable charges relate the length of the charge to the diameter of the channel is 50:1, at the outer ends of flammable charges set details precluding rotation of the logging cable on these charges in the vertical raising and lowering the device into the well, while the section logging cable passing through the channel of all charges and the adjacent section of the same length from the top of the charge thermally insulated thiocholine sealant, and the necessary clearance between charges secured by bonding to one of the ends of each charge four cylindrical solid inserts with sizes providing sumarno the area of the passage between the inserts, equal to or more than the cross-sectional area of the channel charge, covered on the outer surface of the composition which prevents burning and the necessary clearance between the surface charges and surface casing, eliminating the contact of these surfaces is provided with a sticker on the side surface charges "crumbs" from a sheet of polymeric material on the basis of one "rusk" height 0.5 cm area of 1 cm230 cm2side surface charge.

For the manufacture of the device can be used a solid propellant charge of the rocket engines on ballistic fuel subject to disposal.

The high efficiency of the device is supported by a large volume of gaseous products of combustion, high pressure in the treatment zone, high temperature combustion products, as well as the absence of solid condensed phase (slag) in the combustion products due to the lack of metals in the fuel composition.

The simple design is predetermined by the simplicity of the device Assembly, which in turn was created based on the requirements of a minimum of metal and integrity of all its elements during combustion of charges.

Using missile warheads that are to be disposed, relatively simple in design, technology and safety of manufacture of the device and significantly (d is 400%) reduces its value.

Figure 1-4 shows the proposed device, where indicated:

1 - logging cable;

2 - spiral filament;

3 - clamp;

4 - igniting the charge;

5 - intermediate charge;

6 - insert;

7 - "reservation";

8 - "biscuit";

9 is an electric wire;

10 - stud;

11 sealant;

12 - disk;

LC- the length of the charge;

Dkthe diameter of the channel charge.

The device consists of a set of cylindrical channel caseless charges made from solid fuel ballistic collected immediately before the operation of the device at the wellhead using geophysical cable 1 is passed through the axial channel of each charge and held in contact with each other by means of clamps 3, mounted on a geophysical cable 1 on the edges of the device. Geophysical cable 1 through the channel of all charges, limits the area of the orifice channel charges, which may be insufficient for the expiration of the products of combustion at the initial moment of burning that will lead to the destruction of the charge pressure of the combustion products generated as a result of this failure. To exclude an abnormal operation charges for this reason, in the manufacture of charges shall be made against the length of the charge LCthe diameter of Kahn is La D toequal to 50:1. Plot geophysical cable passing through the channel of all charges, and the adjacent section of the same length from the top of the charge, thermally insulated thiocholine sealant 11 from exposure to high temperature products of combustion of the charges. Set charges consists of two flammable charges 4 mounted on the ends of the device, and several intermediate charges 5. The use of two flammable charges due to technical problem of the present invention is improving the efficiency and reliability of the device. Increased efficiency is achieved due to the quality of ignition, i.e. the simultaneous ignition of all charges device that allows to implement the energy charges in the shortest possible time and to provide the necessary pressure pulse. Given the difficult conditions of the delivery device to the treatment area wells and complex work environment, the presence of flammable second charge increases the reliability of ignition. Initiating flammable charges 4 is a spiral filament 2, mounted in charge in the area of the outer end, by applying an electric pulse of a spiral filament 2 from the wellhead through logging cable 1. The number of intermediate charges 5 is assigned depending on the speed of combustion of fuel, the weight of the dawn is a and the depth of the well. For multiple cost reduction of the device, as well as to ensure environmental cleanliness of the process, as fuel charges it is proposed to use channel solid rocket warheads from ballistic fuel outer diameter 65-100 mm subject to disposal. End support of each charge in the Assembly of the device are four cylindrical insert 6, made of the same fuel and glued on one of the ends of each charge riverspring circumference. Insert 6 are designed to provide a guaranteed gap between the charges necessary for the output of products of combustion from the channel last minute charges to relieve excess pressure in the channel that Deplete the charge generated in the channel due to the inequality of getperiod gatorshade in the initial period of operation of the device, when set charges devices that are not separated by inserts, represents one several times increased in length, the charge channel busy logging cable. The height and diameter of the cylindrical inserts 6 are selected depending on the diameter of the channel charge Dkso that the total area of the passage between the inserts 6 was equal to or greater than the cross-sectional area of the channel charge. To prevent premature combustion of the inserts 6 and thereby to maintain the gap between what Aragami in the initial period of combustion of the charges, you need to slow down the combustion process inserts 6, which is achieved by protection from burning "by the book" the open surface of the inserts 6. As a "reservation" 7 uses epoxy composition. Order to prevent unauthorized ignition of the charge from the friction of the side surface charges on the surface of the casing (especially dangerous dry friction) when lowering device in the treatment area on the side surface charges pasted "crackers" 8 - sheet of polymeric material (e.g., nitrosonium) thick, providing the necessary clearance between the surface charge and the casing. "Crackers" 8 pasted on the side surface charges in the plane of the several cross-sections along the length of the charge. The number of sections is determined by the length of the charge. "Crumbs" of adjacent sections are displaced relative to each other by 90° for more uniform distribution thereof over the surface of the charge. The number of "crackers" 8 is determined by calculating a "cracker" height 0.5 cm area of 1 cm230 cm2the surface charge. To reduce the likelihood of churning "crackers" when hitting an obstacle during lowering of the device into the well they are positioned longitudinally in relation to the charge. Geophysical cable 1 to the lowering of the device into the borehole wound on a drum hoist. Leaving the drum, when opuskayutsya, geophysical cable 1 is subjected to torque, established during its laying in the drum. If geophysical cable 1 not rigidly connected with the device when lifting above the well and lowered into the borehole it rotates relative to the device and the deeper the well, the longer its rotation to the full realization of torque. Since the electric wires 9 geophysical cable 1 is connected with the spiral filament 2, mounted in flammable charges 4, when the rotation of the geophysical cable 1 is winding electric wires 9 and, consequently, break the electric circuit. To exclude the influence of torque on the reliability of ignition, it is necessary to firmly connect flammable charges 4 logging cable 1, to this end, the outer ends of flammable charges 4 glued steel plates 12 with a diameter equal to the diameter of the charges. Before gluing on the disks 12 mounted on a single steel stud 10. When assembling the studs 10 are the backbone for clamps 3, the locking Assembly, and transfer the torque from the geophysical cable 1 to the device, thereby eliminating the rotation of the cable relative to the charges.

The device operates as follows.

The device is lowered to the logging cable 1 connected to the cable is the head, at the bottom of a well and set opposite the interval of the processed layer. From the wellhead through geophysical cable 1 serves an electrical impulse to the spiral filament 2 flammable charges 4. For a limited time (0.1 to 0.3) ignite all the charges. Since the combustion of the charge occurs on all outdoor surfaces, the duration of the process is determined by the burning rate, the size of the burning crest of the fuel and the pressure in the treatment area. Figure 5 presents the character of change of temperature T and pressure P in the treatment area oil wells during operation of the device. The powder gas pressure P at this site increases also increase the burning rate of charges U, associated with the pressure dependence

U=U0(T)Pυ,

where U0(T)- the rate of combustion at P1=0.1 MPa, temperature-dependent;

P is the current pressure;

υ is the coefficient determined empirically.

In the short-term fuel charges (2-2,5) the column of well fluid above the device, due to inertia and friction in the borehole remains stationary during the entire burning time charges and plays the role of the packer, so that the area of the combustion occurs a pressure in excess of the mountain, which leads to fracturing. The required level of pressure rupture the reservoir is achieved by selection of surface combustion, the rate of burning and weight charges. Gaseous products of combustion, expanding, result in the movement of the column of well fluid lifting it to a certain height. The pressure in the treatment area falls. Is the depression on the layer (absorption). The liquid column is returned to its original position, compressing the gas. Is repression on the reservoir pressure). Thus happen attenuating vibrations of the column of well fluid, providing repression-depression effects on the producing formation, facilitating a deeper promotion of gaseous products, with the high temperature in the reservoir. As evidenced by the measurements, the temperature in this area may be up to ~1100°C. Deep warming of the productive formation reduces the oil viscosity fluids, i.e. increases their mobility and repression-depression effect weakens their relationship with the reservoir rock.

In 2010-2012, conducted 150 treatment of oil wells in the Russian Federation and the Republic of Kazakhstan with the use of the proposed device. All the wells after processing the obtained positive economic effect.

1. Device for thermobarometry processing bottom-hole zone of the reservoir wells containing a number of open channel solid-propellant charges from ballistic what about the fuel, collected based on the end surface by means of the logging cable passing through the axial channel of all charges and fastening elements, characterized in that the simultaneous ignition of all charges is provided by two flammable charges that are installed on the ends of the device, all applicable charges relate the length of the charge to the diameter of the channel is 50:1, at the outer ends of flammable charges set details precluding rotation of the logging cable on these charges in the vertical raising and lowering the device into the well, while the section logging cable passing through the channel of all charges and the adjacent section of the same length from the upper charge thermally insulated thiocholine sealant, guaranteed clearance between charges secured by gluing on one of the ends of each charge four cylindrical solid inserts with sizes, providing the total area of the passage between the inserts is equal to or more than the cross-sectional area of the channel charge, covered on the outer surface of the composition which prevents burning and the necessary clearance between the surface charges and surface casing, eliminating the contact of these surfaces is provided with a sticker on the side surface charges "crackers" sheet of polymer clay is the main material on the basis of one "rusk" height 0.5 cm area of 1 cm 230 cm2side surface charge.

2. The device according to claim 1 characterized in that its manufacture can be used a solid propellant charge of the rocket engines on ballistic fuel subject to disposal.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: device includes wire-line, unpackaged cylindrical propellant charge with igniter and accessories. According to invention the propellant charge is closed by rigid combustible bag that provides the reduction of charge deformation at high temperatures in well and generation of additional energy quantity. Rigid combustible bag consists of the following components, wt %: thermosetting polymer compound - 30…37; pyroxiline fibre - 18…22; explosive component - 42…48 and plus 100%: ethyl alcohol - 10, wetting agent - 0.1.

EFFECT: increase of device operation reliability at increased temperature influences.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves creation of excess pressure in a well by action on a formation with gaseous combustion products of propellant charge. According to the method, at prolonged high-temperature action on propellant charge at its lowering into the well, propellant charge is used together with a stiff combustible cap that contains the following components, wt %: thermoreactive polymer composition - 30…37; pyroxiline fibre - 18…22; explosive component - 42…48 and over 100%: ethyl alcohol - 10; wetting agent - 0.1.

EFFECT: increasing safety of a processing method of bottom-hole formation zone and its efficiency owing to reducing deformation of propellant charge.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to an oil-and-gas industry, ferrous industry, oil and gas wells, water-supply wells, injection wells, and also to blasting works and it is purposed for equipment of powder pressure generators, first of all, capsule-type sealed generators designed for explosion and thermal-gas-chemical treatment of bottomhole formation zone by fire gases in order to intensify extraction of mineral products. Firing device contains blasting cartridge of electric type in protective shell or safe mechanical detonator without initial detonating agent, secondary cartridge of mixed solid fuel placed inside a perforated metal tube and detonating cord in a metal shell or exploding wire placed in a channel of secondary cartridge block at its symmetry axis.

EFFECT: invention allows essential increase in stability of ignition of the secondary and primary charge of a gas generator thus reducing costs for wells retreatment, elimination of expensive equipment and accessories such as exploders, logging cable, and increase in safety of well operations.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: device for thermal gas-hydrodynamic oil and gas formation fracture comprises a logging cable with a cable head and consists of a remote control unit with a gamma sensor, an instrument head, a mandrel sub, a gas-generating charge case and an independent logging unit. The gas-generating charge of a high-energy antiknock solid-fuel composition is presented in the form of sticks of the external diameter of 36-70 mm and the length of 300-1500 mm with an axial passage of the diameter of 5-28 mm with an electrical igniter. The charge is positioned in a case of the diameter of 89 mm with a wall of the thickness of 9-11 mm and a gas outlet channel of the area of 70% a cylindrical surface of the case with end adapters of the diameter of 105 mm. The adapters are used as formation targeting raisers with the efficiency of the dynamic action effectiveness being a multiple greater than uncased gas generators. The real-time pressure and temperature time history is recorded by independent digital devices at the discretion of 8.0-10.0 thousand measurements per second. To provide better emergency tolerance and to make the gas generator advance into wells at a zenith of 90° or more, the multilayered logging cable of the diameter of 8-28 mm and the tensile strength of 60-250 kN is used.

EFFECT: more effective involvement of terminal oil-saturated sites.

3 cl, 2 dwg, 1 app

FIELD: mining.

SUBSTANCE: heat source comprises a body, which is equipped with a composite material that generates gas during combustion and actuates from an electric spiral, and layers of epoxide compound and thiocol-based sealant sealing the ends of the material of the gas-generating composition. The composite material of the heat source that generates gas during combustion contains efficient amount 20 wt % of powdery polyvinyl chloride chlorinated resin of brand PSH-LS at the following ratio of composition components, wt %: granulated ammonium nitrate of grade B - 57.0±0.2; potassium bichromate - 3.0±0.1; aluminium powder of grade ASD-4 - 5.0±0.1; barium nitrate - 15.0±0.2; polyvinyl chloride resin of grade PSH-LS - 20.0±0.2. The gap produced in the outfit between sticks and the body of the heat source is filled with a filling solution capable of hardening. Between the igniter and the composite material the heat source comprises layers of additional igniting composition with the capability of its ignition from the igniter and ignition of the gas-generating composition at the end and along the surface of the heat source channel.

EFFECT: increased safety of operation, transportation and storage of a device for hydraulic rupture of a bed.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves assembly of a pressure generator in the form of a group of cylindrical solid fuel charges with central through channels, lowering of the pressure generator to the well, installation of the pressure generator at the specified depth of the well, supply of a signal for ignition of charges and fracturing of the formation. In the existing casing string of the well, preliminary perforation density is performed as 30-45 holes per running metre, assembly of a pressure generator is performed out of three groups of solid fuel charges with location of charges of the first group below charges of the second and the third groups; the pressure generator is installed in the well above the perforation interval so that ratio of distance between upper perforation boundary and lower charge of the first group to length of perforation interval comprises the value of 0.3-0.6. The first group of charges has a charge with an igniter and total design weight of all charges, which provides the possibility of ignition of above located charges of the second group with the developed combustion surface and gas emission at combustion, which provides opening of existing vertical fractures in the formation and initiation of combustion of charges of the third group, which provide non-reversible deformation of mine rocks of the formation with creation of a residual vertical fracture.

EFFECT: improving filtration properties of the formation throughout its thickness.

9 cl

FIELD: oil and gas industry.

SUBSTANCE: excess pressure is created in the well by acting on the formation with gaseous combustion products of frameless cylindrical solid-fuel charge having igniter, central round channel and solid-fuel segments projecting on opposite cylindrical surfaces parallel to axis of central channel, with longitudinal slots made in them for the rope of the assembly device, and the distance between slots, which is equal to outer diameter of cylindrical part of charge. According to the invention, excess pressure controlled as to amplitude and duration is created in the well without deformation and fracture of charge, which is caused with excess critical pressure of combustion products in cavity of its channel relative to the charge environment. It is achieved by installation opposite the formation or near the formation of charge with through central round channel having the ratio of channel length to its diameter, which is equal to (22-38):1. Increase in duration of action on formation at decreased pressure is achieved by attachment to that charge of additional cylindrical solid-fuel charge with similar projecting segments with slots and its length-to-diameter ratio equal to (5-15):1 with straight end faces or with a groove on the end face. At that, ignition of additional charge in the well is performed from igniter of lower charge with through channel or from igniters of charges with through channels, which are located from above or from below of additional charge. Current supply wires from geophysical cable to igniter are passed through the channel or longitudinal slots of segments of charge having a through channel, and longitudinal slots of segments of additional charge.

EFFECT: increasing treatment efficiency.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves well perforation using a hollow-carrier perforator and further fracturing of formation using thermal gas generator, emission of gas during combustion of its fuel, which is supplied through the connecting assembly to perforator housing and directed jets acting on the formed perforation channels. As thermal gas generator fuel there used is mixed composition that is not detonable, which generates the gas during combustion with major content of chemical high-activity chlorhydric acid owing to which there created is chemical influence on the rock matrix and thus the sizes of channels and cracks are increased, walls of perforated channels are sealed and growth of filtration surface in productive formation is performed; at that, gas action on perforated channels in the formation is performed in the form of pulse pressures.

EFFECT: increasing formation perforation efficiency together with start-up in common perforator device and thermal gas generator, at combustion of fuel of which high-activity chlorhydric acid is formed.

2 cl, 4 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed pressure generator is intended for encased shaped-charge perforators, implosion devices and powder generator devices arranged on cable and made up of integral tubular lining charge to be secured on device case of cable surface. Said charge is composed of fragments secured on device case or cable surface, arranged one after another. Note here that said fragments are made from rod elements of ballistic artillery powder shaped to uniform tubular structures by gluing outer side surfaces of powder elements by nitrocellulose size.

EFFECT: higher completeness of powder charge combustion and efficiency.

FIELD: oil and gas industry.

SUBSTANCE: powder channel pressure generator lowered to the well by means of geophysical cable consists of powder charges made in the form of cylinders with a central channel and with holes made in side surface of powder charge, which are connected between the cover and tray by means of a rope. In upper and lower powder charges there installed are glowing filaments electrically connected to geophysical cable. Holes made in side surface of powder charge are inclined towards geophysical cable, and angle between central axis of powder charge and axis of hole in side surface of powder charge is less than 90°.

EFFECT: improving efficiency of action on oil-water formations of solid fuel combustion products; improving installation accuracy of the device at the selected treatment interval; preventing the displacement of powder pressure generator after it is activated.

6 cl, 6 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: according to accelerated variant, perforation of well-adjacent bed zone is performed by cased cumulative perforator. Adjustable pulse gas-dynamic bed fracturing is performed through apertures of perforator. It is provided with subsequent operation in given time of delay of main and additional gunpowder chambers. Thermal gas-chemical effect on well-adjacent zone of bed is provided for in given delay time of thermal gas-chemical chamber with charges. Implosion treatment is performed in given delay time of implosion chamber. Treatment is set by volume of implosion chamber and size of pass cross-section of flow aperture and/or group of apertures, connecting inner volumes of chambers.

EFFECT: higher efficiency.

12 cl, 3 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling long horizontal wells in bed and effecting on bed through them. Most of bed is covered by these wells. Along whole length of them explosive substance is placed to provide explosion temperature for length unit of well from 3500 to 1400 kcal/m and filling volume of horizontal wells by explosive substance from 5 to 20% during filling of remaining wells volume by liquid. After explosion, a packer is lowered into cased portion of wells.

EFFECT: higher efficiency.

3 cl, 1 tbl, 1 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 industry.

SUBSTANCE: method includes lower heat energy source and implosion chamber into well. Heat effect is applied and phase-explosive process is launched by opening implosion chamber. Implosion chamber is opened after reaching maximal temperature of well liquid at the very beginning of its decrease. Then phase-explosive process launch temperature is decreased. At second object method includes lower heat energy source and air implosion chamber into well. Heat effect is applied and phase-explosive process is launched by opening air implosion chamber. Air implosion chamber is positioned at distance from heat energy source, where well liquid temperature provides for launch of phase-explosive process, or air implosion chamber is opened with a delay. By these, excessive energetic potential of phase-explosive process is prevented with destruction of casing column and cement stone. Power of phase-explosive process is limited by use of air chamber under pressure.

EFFECT: higher efficiency.

2 cl

FIELD: oil and gas industry.

SUBSTANCE: method includes placement of deep operation body in perforation zone, capable of forming pressure pulses via remote initiation of gas mixture explosions. Depression of bed is performed by lowering liquid level in a well, forming a certain volume of explosive gas mixture in deep body, performing multiple effect on bed without raising of body until well product influx increases. Explosion pressure is set on basis of hydrostatic pressure of well liquid and volume of explosive gas mixture on basis of table provided in description.

EFFECT: higher efficiency.

1 tbl

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.

3 cl, 2 dwg

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

FIELD: oil production, particularly methods for stimulating oil production.

SUBSTANCE: method involves performing deep perforation through all intervals of formation to be treated; assembling sectional charge with central channel for tool set passage; lowering charge into well and combusting sections thereof formed of compositions providing charge burning in aqueous, oil-and-water and acid medium to form combustion products; increasing pressure and temperature inside the well; performing control of charge section burning in real time mode during fast combustion thereof; recording behavior characteristics of the charge and estimating the pattern of action exerted on the formation and bottomhole formation zone response to the action. Composite rod formed of material providing rod integrity during mechanical and heat load application during charge lowering/lifting and combustion process is used for charge assemblage. Composite rod has inner channel extending along central axis thereof adapted for passing power lead of ignition unit and wire with heat-resistant insulation connecting borehole cable with electronic unit adapted for controlling and recording behavior characteristics of the charge. Electronic unit is connected with lower part of lower rod and spaced a distance from charge sections. The distance is selected to prevent direct action of charge combustion products on the electronic unit. Besides, gas flow distributor is arranged between lower charge section and electronic unit to provide maximal directed action onto formation to be treated. Inner charge cavity is filled with surfactant for the full structure height to provide additional differential pressure drawdown and mechanical impurities removal as a result of surfactant foaming during charge burning. Perforation is performed through all formation intervals by means of perforator with 30-45° phasing so that vertically inclined spiral cracks around well bore in bottomhole zone are formed after charge combustion. The cracks are restricted from closing during following hydraulic fracturing and provide hydrodynamic communication between well and formation. For charge assemblage upper and lower rods connected to both ends of load-bearing rod part are used, wherein upper rod is lengthen up to 2.0-2.5 m, lower one is extended up to 1.0-1.5 m.

EFFECT: reduced accident risk, decreased thermal impact action on borehole cable, possibility of well normal operation after treatment thereof due to prevention of pump clogging with mechanical impurities and pyrobitumens during well operation starting and increased perfection of reservoir drilling-in.

2 dwg

FIELD: oil production, particularly to stimulate bottomhole zone contaminated with paraffin, asphaltic resinous, salt, sludge and other deposits to increase oil output.

SUBSTANCE: method involves combusting solid fuel charges in well and creating successive excessive pressure pulses of gaseous combustion products. Solid fuel charges are combusted simultaneously with providing periodical stepped change in area and combustion temperature along with performing control of gas entering into well. This provides excessive pressure pulses which occur with frequency corresponding to time fractal processes of fatigue crack propagation in geological bed environment and creates pressure oscillations with 0.5-800 hertz frequency. The pressure oscillations act upon bed matrice material, as well as upon fluids and mud filling it.

EFFECT: increased efficiency due to increased coverage of elastic vibration application, reduced power inputs, creation of favorable conditions for nonreversible crack-propagation process and for providing purposeful triggering action.

24 cl, 4 dwg

FIELD: oil production, particularly to penetrate oil formations characterized by low filtration characteristics.

SUBSTANCE: method involves applying gaseous medium pressure action to formation within productive zone interval, wherein the gaseous medium is obtained from reaction between oxidizing agent and fuel, which are self-ignited once brought into contact. The oxidizing agent is halogen fluoride or derivatives thereof or nitronium perchlorate. The fuel is formation fluid. Contact between the oxidizing agent and the formation fluid is provided by supplying the oxidizing agent into the formation in impulse mode. The oxidizing agent supplying is carried out in shots performed by gun or gas-jet perforator provided with bullet and oxidizing agent or with conical casing and oxidizing agent.

EFFECT: possibility to combine well perforation operation with crack forming (formation breakdown) operation and, as a result, increased ability of formation treatment.

4 cl, 2 tbl, 2 dwg

Up!