Well perforator

FIELD: oil and gas industry.

SUBSTANCE: perforator comprises a monolithic body (6) with cavities (5) made in it perpendicular to its longitudinal axis, which are made directly in the material of the perforator body. Separately made mutually conjugate constructive parts of cumulative charge are tightly fitted directly in the cavities (5): outer cover (1) of the cumulative charge, a seal curtain-washer (2) or a gland, a cumulative funnel (3), a cartridge (4) of the main explosive. In addition, a detonation transfer amplifier (7), a sealing gasket (9), a detonating cord (10) and a bushing (11) with a groove are disposed in the body (6). Each charge is connected to the detonating cord (10), located in the channel made on the outer surface of the body and ballistically connected through the hole (8) with the cartridge (4) in the cavity (5). The cartridge (4) of the explosive of each of the charges is fixed directly to the body cavity (5) and is provided with a cumulative funnel (3) mounted thereon with an outer cover (1).

EFFECT: increased efficiency of devices uses, simplification of its production, expanding the range of technologies and materials used for the production, reduced material consumption and number of components required for assembling.

7 cl, 3 dwg

 



 

Same patents:

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 (787).

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: mining.

SUBSTANCE: perforation system for well casing string comprising a hollow body with holes along its side surface, hollow plugs with bottoms fixed in body holes at the specified angles to the body axis. The body cavity is communicated with cavities of plugs and forms a single tight system with the medium of specified density. Jet charges are placed in the body. Each of these charges is aligned towards the appropriate hollow plug - along its axis. Hollow plugs, with their bottom part, protrude beyond the body dimensions by the value providing for alignment of this body in the casing string of the specified diameter and damage of plug bottoms in the operating position of the perforation system in the zone near the casing string and the focus distance of jet charges. At the same time the body has diameter and length providing for its longitudinal flexibility.

EFFECT: improved piercing capacity of a perforation system regardless of perforated casing string diameter and well curve.

14 cl, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: casing string perforation tool contains a case with pyrotechnic charge. At that amount of charges per case length unit is variable in order to decrease well watering. Casing string perforation method includes descending the case with pyrotechnic charge inside, at that execute perforation with variable holes area per length unit in order to decrease well watering.

EFFECT: well watering decrease.

11 cl, 12 dwg

FIELD: mining.

SUBSTANCE: facility for removing filter cake from well with uncased borehole consists of sealing element designed for installation in well and creating chamber with pressure below pressure in borehole of well in chosen interval and, at least, one opening selectively opened to facilitate communication between chamber and interval of well borehole and capable, when opened, to provide flow of fluid medium into chamber and create conditions of transient negative differential pressure in interval of well borehole for removing filter cake from chosen interval of well. The sealing element and, at least, one opening are configured on base of conditions of transient negative differential pressure determined in correspondence with empirical data or imitation modeling performed with software support for characteristics of well interval, wherein said conditions are created.

EFFECT: upgraded efficiency of cleaning well borehole and filtration channels, connecting natural fractures of formation and providing new technologies for usage of drilling agent under conditions of complicated rock deposited under surface.

14 cl, 20 dwg

FIELD: explosive material protection, particularly for that used in wells.

SUBSTANCE: device has perforator or shaped charge case, explosive material in case and module filled with absorbing material and arranged near explosive material to absorb aggressive fluid. Explosive material is arranged outside the module. Gun perforator used in well hole has explosive component, absorbing material arranged near the explosive component and adapted to absorb aggressive fluid and explosive material protection and module comprising absorbing material. Explosive component is arranged outside the module. Method of explosive material protection involves arranging absorbing material, which is effective at 140°F in high-temperature environment in the vicinity to explosive material to absorb explosive material and to protect above explosive material, wherein the absorbing material is placed in perforator or shaped charge case; driving assembly including charge material, case and absorbing material, in well hole, wherein the explosive material is located outside the case. Downhole tool has member to perform operations inside well, explosive material and at least one module including absorbing material to absorb aggressive fluid. Each module has container filled with absorbing material. Each container comprises member selected from group including metal sieve, metal net or porous plastic material. Device used in well hole has protective material adapted to cooperate with aggressive fluid to reduce hazardous effect thereof and container at least partly formed of protective material, which may melt inside well hole to release the protective material.

EFFECT: reduced explosive decomposition.

35 cl, 10 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

The invention relates to the oil and mining industry, is intended to improve permeability by fracturing and fissuring bottom-hole formation zone

The invention relates to the oil and gas industry and can be used when conducting perforating operations in wells

The invention relates to the oil industry, particularly explosive in the borehole, and can be used to increase the productivity of oil wells

The invention relates to oil, gas and vododobyvayuschih industry and can be used for perforating wells

The invention relates to a device for perforating wells, namely the cumulative perforators, and is intended for secondary opening of productive reservoirs of oil and gas wells

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

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