Device for gas dynamic processing of formation

FIELD: oil and gas industry.

SUBSTANCE: device for gas-dynamic treatment of a formation relates to the oil and gas industry and can be used for breaking and gas-dynamic local treatment of oil and gas bearing seams by combustion products of solid fuel (gas-generating) charges to improve the hydrodynamic connection of the well with the formation, including in wells with low reservoir pressure. Device comprises a suspension, main and working gas generating charges, an ignition circuit with an explosive cartridge and detonating cord. Ignition circuit is provided with an additional explosive cartridge with a piece of detonating cord located on the opposite side of the assembly. Main gas-generating charges are placed between the main and additional explosive cartridges.

EFFECT: technical result is localisation of processing in the selected interval of the well with a significant reduction in the undesirable effect on the overlying zone.

1 cl, 1 dwg



Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil production industry and can be used during development of pure oil deposits with low-permeable reservoirs. Method of development of low-permeable oil deposits includes drilling of the production and injection wells as per in-line development system using the hydraulic fracturing in all wells. Rows of injection and production wells are arranged in parallel and alternating by one in direction of the maximum horizontal stresses of the reservoir. At that the production and injection wells are drilled with horizontal bores in direction of the maximum horizontal stresses with multi-stage hydraulic fracturing.

EFFECT: increased rate of oil extraction and reduced density of wells grid.

3 dwg, 2 ex

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used for thermochemical fracturing. The method consists in use of energy of the oxidation reaction of gel-forming compound, initiated by the reaction initiator for fracturing, and proceeding in the bottom-hole area of layer remote from the well. At that the catalyst, the fuel and the initiator are used in the form of solutions in water.

EFFECT: increasing the efficiency of fracturing operations and creation of network of extended cracks which enables to increase significantly the productivity of oil and gas wells.

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used for methane production from coal seams. Proposed method comprises drilling or opening of used vertical well at methane-coal bed and determination of seam depth in well cross-section. Coal grade composition is defined and short high-pressure directed pulses source is fitted via working interval of vertical well in said methane-coal bed. Said bed is subjected to the effects of energy of plasma generated by the blast of calibrated metallic conductor as intermittent directed short high-pressure pulses. The number of high-pressure pulses and duration of said effects in interval of methane-coal bed is defined by bed depth in well cross-section and coal grade composition.

EFFECT: higher efficiency of methane production, lower costs and higher safety.

1 dwg

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

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 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