Device for treatment of bottom-hole zone

FIELD: mining.

SUBSTANCE: invention relates to mining industry and intended for productive formations opening in oil and gas wells during drilling and blasting operations. Device for bottom-hole zone treatment contains hollow-carrier perforator or capsule-type perforator in casing string with cumulative and gas-generating charge of solid fuel, combined with acid reagent. Cumulative charge recess lining is fluoroplastic or other fluorine- and/or chlorine-containing polymer material. Cumulative and gas-generating charges initiation from corresponding to each charge initiation device is carried out simultaneously. Solid fuel, combined with acid reagent, is ammonium perchlorate and epoxide compound mixture in following ratio of components, wt%: ammonium perchlorate – 70–90, epoxide compound – 30–10.

EFFECT: enabling increasing efficiency of design well flow rate achievement, especially under carbonate reservoir conditions, elimination of well and its perforation channels blockage with fragments of cumulative charges sealed housing, elimination of casing pipes damage and deformation due to absence of metallic cumulative jet effect, improving acid reagent action efficiency.

3 cl, 4 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

Cumulative charge // 2557281

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas production. Perforator for use in well containing cumulative charge; the cumulative charge shell; the cumulative charge explosive located inside the shell; lining of the cumulative charge adherent to the explosive and made with possibility of the cumulative jet creation upon explosive detonation to make the perforated channel; at that component of the energetic material of the lining is intended for its exothermal reaction inside the perforated channel after the explosive detonation; and gas creating component of the lining is intended for reaction upon presence of the exothermal reaction of the energentic material component to create gas, thus creating pressure wave that moves back via the channel to clean the channel of debris.

EFFECT: assurance of the cumulative perforating jet used both for perforated channel creation in the formation rock, and to clean the perforated channel of fragments.

17 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and is intended for opening of the production deposits in oil and gas wells by creation of the perforation channels and additional treatment of the channel area by the chemical agent. Method of wells completion includes initiation of the explosive charge from the recess located in the charge end opposite to side of the charge initiation, the recess is lined with inert material, throwing, acceleration and compression of the cumulative lining material by the products of the explosive detonation, its collision at the central line of the charge, and creation of the cumulative jet During the cumulative lining throwing and compression it is under additional action due to forced interaction of the cumulative lining and one or several additional bodies, their collision and sliding of parts of the cumulative lining material relatively to the additional bodies with simultaneous rotation of parts of the cumulative lining material, collision of parts of the cumulative lining material on the central line of the charge with the cumulative jet creation. Additional body or additional bodies are made out of chemically active substance with density not exceeding the density of the cumulative lining material. The cumulative charge is installed in the casing string, the chemically active substance of the additional body is initiated during its throwing by the products of the explosive detonation and interaction with the cumulative lining, perforation channel is made in the casing string and surrounding production deposit by the created cumulative jet with simultaneous injection of the chemically active substance by the created cumulative jet, and filtration area in the production deposit surrounding the perforation channel increases through the entire length.

EFFECT: increased productivity of the oil wells, and deconsolidation of the perforation channel.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method for obtainment composite cumulative jets in perforator charges includes initiation of explosive charge with open cavity shaped as a spherical segment in explosive charge body towards cavity, liner of the cavity by different materials. Each next layer following the previous layer joining the cavity of explosive charge is made of material with less specific weight in regard to the same value of the previous layer material; tossing explosion products to the liner, reversing the liner along the charge symmetry axis towards opposite side of its movement, breakaway of inner layer of the liner from outer one, forming composite cumulative jet from inner layer of the liner with maximum speed, which is bigger than maximum speed of the formed cumulative jet from outer layer of the liner. The liner is made layered with at least two layers; all layers are made separate and of different thickness with reduction of the layer thickness from the central part towards peripheral part and from the butt end of charge with depression an axisymmetric hollow converter is placed and its inner profile is shaped mainly as truncated cone narrowing towards direction of cumulative jets movement. In process of tossing and reversing of cumulative liner peripheral part of the liner is impacted additionally in sequence, at first to the liner of material with less density, then to material with bigger density due to their mutual collision and sliding along inner surface of the converter thus converting longitudinal velocity of the liner tossing to radial speed of its compression.

EFFECT: increased depth of perforation channel.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: plane wave explosive generator for cumulative perforators consists of imitator, a body with preliminary explosive charge with hollow lens and metal cone placed in it, the lens and the main explosive charge placed under the metal cone base, which cross-section corresponds to the base of the generator metal cone with aperture angle determined by the condition that at the moment of impact against the main charge surface the cone material has flat shape. The cone and lens are made of pressed metal powders, for example, of iron or metal ceramic impregnated with celluloid with quantity of the filling material varying within the range of 20-50%.

EFFECT: improving efficiency of hollow-cone charges.

2 dwg

Cumulative charge // 2534661

FIELD: weapons and ammunition.

SUBSTANCE: charge includes a housing with a stick BB and hollowness in the form of open tulip. Lining has acute-angled conical end made from a mixture of powder metals mated to metal base. The form of side base surface is formed by arc rotation around axis, and an angle between the tangent to arc in the place of connection to the end and charge axis is (78±7)°.

EFFECT: improving quality of producing reservoir opening while forming expanding cumulative channel in deposit rock.

3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to shaped-charge perforator assemblies and is designed to joint the cases together and to transmit detonation. Proposed assembly comprises first and second parts articulated by split joint. Transfer charge is arranged in said first part and connected via first intake charge with detonating cord. Second intake charge is arranged in second charge and connected with second detonating cord. Blank bore is made at said first part with thread at bore part to accommodate damping sleeve. Transfer shaped-charge is arranged inside damping sleeve. Damping sleeve and transfer shaped-charge are secured inside said blank bore by the sleeve screwed to said first part.

EFFECT: higher reliability.

3 dwg

Modular perforator // 2519088

FIELD: process engineering.

SUBSTANCE: invention relates to shaped-charge shell-type perforators to be used for well wall perforating. Modular perforator comprises separate modules interconnected by appropriate connection means that can transmit detonation between said modules. Every said module incorporates shaped-charges and interconnected detonation channels composed by detonating cords. Every module connection assembly comprises first and second parts articulated by split joint. Transfer charge is arranged in said first part and connected via first intake charge with detonating cord. Second intake charge is arranged in second charge and connected with second detonating cord. Blank bore is made at said first part with thread at bore part to accommodate damping sleeve. Damping sleeve and transfer shaped-charge are secured inside said blank bore by the sleeve screwed to said first part.

EFFECT: higher reliability.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: perforator includes a perforator carrier passing in longitudinal direction, a charging pipe placed inside the perforator carrier and passing in longitudinal direction, a cumulative charge supported with the charging pipe, containing a bowl-shaped cover having a rim that forms a hole into the cover inner volume, lining inside the cover, and an explosive between the cover and the lining; besides, cumulative charge is directed in the first direction and has an axial line passing along the first direction being basically perpendicular to longitudinal direction, and liquid back fill located on outer side of the inner volume of bowl-shaped cover and near the cumulative charge in the first direction and crossing the axial line.

EFFECT: improvement of liquid communication with a reservoir in formations around the well.

22 cl, 2 dwg

FIELD: blasting.

SUBSTANCE: method and device relate to perforation of well casing pipes for production of well, gas, water, and may be used in jet perforators that improve hydrodynamic connection of a bed and a well, and providing for increased well yield. A shaped charge comprises a body, inside of which there is an explosive cartridge. The cartridge gas a charge hollow coated with lining. Inside the lining there is an insert fixed with a layer of plastic material. The density of the plastic material layer is 0.8-2.4 g/cm3. The product of density by thickness of the plastic material layer is less than the thickness of the wall insert. The ratio of insert top thickness to the diameter of the lining base is from 0.1 to 0.3. The ratio of insert height to lining height is from 0.5 to 0.8. The explosive cartridge is exploded. Detonation products press the shaped lining, then the plastic material is pressed and heated. The impact wave energy is reduced. The speed of shaped lining pressing is reduced. The impact wave from collision of the insert and the lining is sent from the zone of collision along the lining material. Large amount of the lining and insert participates in generation of the jet stream. The jet stream is shaped.

EFFECT: original design of lining and increased efficiency of explosive energy takeoff by lining elements.

8 cl, 3 dwg, 4 tbl

FIELD: oil and gas industry.

SUBSTANCE: method of subsurface perforation lies in delivery of shaped charge to the well; this charge consists of a case, explosive material in the case and coating that surrounds explosive material in the above specified case; it has a top part which profile is thicker than profile of any other part of the coating, at that coating and its top part are made of powder material and density of the material in the top part is bigger than density of material in adjoining part of the coating while porosity in the top part is less than porosity of material in adjoining part of the coating; thereafter shape charge is detonated.

EFFECT: increase of flame penetration length to formation resulting in gain in yield of hydrocarbons or any other fluids from the perforated formation.

11 cl, 9 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

Up!