Perforation and treatment method of bottom-hole zone, and device for its implementation

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

 

The invention relates to the oil industry and can be used to increase the efficiency of the secondary reservoir.

To increase the effectiveness of the traditional method of cumulative perforation in the currently used technologies and devices, allowing you to simultaneously punch and process bottom-hole zone, for example to create cracks in the perforated interval of the reservoir, which increases its reservoir properties.

The known method and device for joint perforation and formation of cracks in the near-wellbore area of the formation [1], based on the location between the shaped charge perforator of cartridges from the gas-generating fuel (attached charges). Due to the timing of the actuation of shaped charges, creating perforation tunnels in the reservoir, and associated charges, forming the combustion gases of high pressure, optimum stimulation for the formation of cracks.

The disadvantage of this method and device is inefficient use of energy products of combustion of gas-generating fuel for the formation and expansion of cracks and for cleaning channels of perforation. The combustion energy of fuel is mainly spent on the creation of a pressure pulse. In connection with the losses of heat due to kratkovremenna the impact of gas to the reservoir, constituting a fraction of a second, and also because of the chemical inertness towards the rock formation gases generated by the combustion of the fuel, a positive result in many cases cannot be achieved when processing different types of rock formation, such as the processing layers of carbonate and terrigenous rocks. For the latter, the most effective is the chemical impact directly on the skeleton of the breed for channel expansion and cracking, and heat to clean perforation channels from polluting fluids. The drawback in this method is the difficulty associated with the need to ensure triggering cumulative and associated charges.

A device for joint perforation and formation of cracks in the layer

[2], contains two consecutive on the host frame of the module: punch module with shaped charges and the gas-generating module in the form of a tubular charge of solid fuel is pressed into the inner channels of the Central tubes of metal. The modules are made with the possibility of their simultaneous ignition of, for example, a detonating cord. The gas-generating module is made in the form of a set of tubular charges with the extension from 2 to 6. Both modules have a single chain of initiation of the shaped charges and the ignition tube of charges in the form of detonating cord. The latter is made of solid rocket fuel nematodirosis composition, for example based on ammonium perchlorate or potassium, goucestershire and additives.

The device works in the following way. The device is lowered into the well through the drill pipe using the cable. By submitting an electric pulse to the detonator to cause detonation of the detonating cord, from which fire shaped charges and then charges mixed solid fuel. The result is a combined processing of the PPP, including the creation of perforations and their development into the reservoir in the form of vertical cracks with a length of 2-5 m

The device and method of its operation have the following disadvantages. Used solid rocket fuel in the description referred to nematodirosis composition. The main component (about 70%) of such fuel - ammonium perchlorate or potassium - is, however, detonatsionnoopasnyh, high sensitivity to explosion by shock stress and high-risk when applying. The description is not presented, what are the indicators of this fuel is nematodirosis. If it is nematodirosis, it is not shown how this fuel is initiated in the form of combustion from the detonating cord. If the fuel is detonating, at the initiation of the detonating cord will det the nation fuel which can lead to destruction of the device and design well. Another disadvantage is the inefficient use of energy products of combustion of gas-generating fuel, in particular thermal and chemical components of the energy in the fuel due to the short-term impact of combustion products on the layer. It may be noted that the solid rocket fuel is not only significant heat energy and a certain amount of chemical energy in the form of emitted during the combustion of hydrochloric acid, can affect the skeleton of the reservoir rock. The amount of hydrochloric acid is, however, a small proportion, not exceeding 20% wt. initial concentration (up to its dissolution in the borehole fluid) generated gases.

The closest the invention of the prototype is the way of the perforation and treatment of bottom-hole zone of the well and the device for its implementation [3], including perforation of the well painted with a cumulative punch and implosive effect on bottom-hole zone of the well directly into the end of the perforation of a well with a selection of well fluid in the implosion chamber formed in opposite perforation, and the volume of the implosion chamber and casing perforator take in the ratio 3÷12:1 is respectively. After implosion stimulation produce fracturing pressure exceeding the fracture pressure. To do this, run thermogenerator, during fuel combustion, which produces gas that enters the body punch and directional jets on pre-formed perforation channels affects these channels in the reservoir. Evaluate the effect on the formation and operation of the device according to the continuous recording time parameters of pressure and temperature.

The disadvantage of the prototype method is low efficiency for processing the well bottom zone of thermal and chemical component of the energy of the gaseous products of combustion of thermogenerator because of the short duration and the inertia of their impact on the formation rock. The energy of the gas it consumes, mostly, to create a pressure pulse fracturing. In the description of the prototype is not the view, characterization, and, accordingly, hazard class used in thermogenerator powder fuel.

The device is a prototype for perforation and treatment of bottom-hole zone of the well includes a hollow body with plugged holes placed in it shaped charges, a means for their actuation and implosion chamber, the inner cavity to the second connected with the inner cavity of the casing perforator, moreover, the ratio of the volume of implosion chamber and casing perforator is 3÷12:1, respectively. The device is provided with thermogenerators installed above the casing perforator attached via a connection node, which is fixed to the lattice plugged the holes. When this charge characteristics and the total area of holes in the lattice is chosen to ensure that the fracture pressure created by the jets of hot gases directed from the open hole casing perforator directly in the pre-formed perforation tunnels in the reservoir. For this purpose the device is provided with centralizers, excluding moving toward the camera relative to the casing. To assess the nature of the impact and operation of the device is equipped with sensors of temperature, pressure and for determining the location of the instrument in the well - locator.

The drawback of the device and method of the prototype, as well as their similar [2], is unclear synchronize the operation of the perforator and thermogenerator, in particular, how the body thermogenerator saves leaks in the high pressure created in the process of punch and implating impact and how do they knock out plugs out of the holes of the lattice in protivopolojna the m direction when pressure in the fuel combustion process of thermogenerator.

The method and apparatus of the prototype have, moreover, the disadvantage associated with a combination of perforation and implosive impact fracturing pressure of the gas of thermogenerator. This is a pressure fracturing gases an important condition for the method and device is that the streams of gas flowed through hole punch aimed directly at the pre-formed perforation tunnels in the reservoir. As is well known [see e.g., 4], when implosive effects in the borehole, is, however, moving the cable and the implosion of the camera, and in the case of the method and device according to the prototype, and the body of the perforator. This leads to the fact that the hole punch will move relative to the perforations, and, accordingly, will significantly decrease the efficiency of the method. In this regard, the method and device prototype using implosive effect and implosive device is impractical. Also is inefficient supply device centralizers, since the movement of the device in the process of implosion will be implemented through joint move an entire column of wellbore fluid relative to the casing string.

In the present invention solves the problem of increasing the efficiency of the method and device for integrated perf the radio and processing bottom-hole zone of the well by eliminating the above disadvantages. The task is solved in that in the method of perforation and treatment of bottom-hole zone of the well, including perforation of the well painted with a cumulative punch, subsequent fracturing, using for this thermogenerator by its launch, implementation by burning its fuel gas flowing through the connection node formed in the perforation tunnels, according to the invention in thermogenerator as fuel use is unable to detonation mixed composition on the basis of oxidizer and fuel, capable of combustion to generate a gas with a predominant content of chemically highly active hydrochloric acid, for example, well-known compositions, including, % wt.: the ammonium nitrate grade B 32-33, hexachlorethane 58-57, PVC resin chlorinated brand PSC-HP 10 [5], which produce a chemical effect on the skeleton of the breed, and thus further increase the size of the channels and cracks, resultnat wall perforations and provide a growth surface of the filter in the surrounding channels the reservoir, and the effects of gas on the perforation tunnels in the reservoir is produced in the form of pulse pressure.

Using the proposed method as fuel thermogenerator mix compositions on the basis of oxidizer and fuel is th, capable of combustion to generate a gas with a predominant content of chemically highly active hydrochloric acid, for example, well-known compositions, including the ammonium nitrate grade B, hexachlorethane and PVC resin chlorinated brand PSC-drug, allows not only to produce, as in the prototype method, fracturing pressure of the gas, but may also have a chemical effect on the skeleton of the breed, and thus further increase the size of the channels and cracks. The combustion of the fuel used gas-generating composition is allocated in the active high-temperature and gatica under the conditions of the wells hydrochloric acid, which constitutes 59% of the mass of fuel. The total of all gases in the combustion of the composition is 800 l/kg

Formed after perforation channels have reinforced wall peel that reduces the filtration ability of the treated layer. Later after perforation chemical effects of gases on the proposed method resultsthat wall perforation, which leads to the growth surface of the filter in the surrounding channels the reservoir.

The advantage of the used composition, compared with the method of the prototype is that it is incapable of detonation material and is by hazard class 4.1., that increases the be the danger of its use and storage.

A distinctive feature of the proposed method compared with the method of the prototype is also what the impact of gas on the perforation tunnels in the reservoir is produced in the form of multiple pulse pressure, which result from the expiration of directed jets of gaseous products from the open hole casing perforator and contribute to the disclosure (frac) and the development of additional cracks in the bottomhole formation zone. Such pulsed nature of the impact pressure of the gases of combustion of the fuel thermogenerator similar to the nature of the impact of the gases formed by the method of bottomhole zone treatment using a submersible pulse generator pressure [see e.g., 6], in which the combustion of the fuel in the generator housing are formed of high pressure gases. When reaching a certain value of this pressure, as in the proposed method, there is a depressurization pre-sealed holes in the generator housing, the heated gases under high pressure may be derived from the holes, creating multiple pressure pulses in the form of waves of expansion and contraction.

For the implementation of the method uses a device (Figa-in), comprising a housing 1 punch plugged the holes 2, placed in it shaped charges 3 and a device 4 for their deployment area is s, thermogenerator 5 in the housing 6, is attached via a connecting node 7 in the form of a lattice plugged the holes to the chassis 1 of the machine. The characteristics of thermogenerator and the total area of holes in the lattice is chosen to ensure that the fracture pressure created by combustion of thermogenerator jets of hot gases directed from the open hole punch directly in the pre-formed perforation tunnels in the reservoir. To assess the nature of the impact and operation of the device is equipped with sensors of temperature, pressure, and location of the instrument in the well - locator. According to the invention thermogenerator 5 in the device is located below the casing perforator, for the simultaneous launch of the punch and thermogenerator, the latter is provided with an additional piece 8 igniter composition and a regular electric igniter 9, for example an electric initiator heat-resistant type EI-2T, triggered, as the device of the explosive cartridge 4 hole punch, from the same regular fixture on the mouth, for example, explosive high-frequency device type UIP-1. The grid openings of the connecting node 7 is equipped with plugs in the form of a solid metal disk 10 and the elastic tube 11 with who is the very useful, on the one hand, sealing the holes of the lattice when firing shaped charges in the body punch and, on the other hand, disclosure of these holes in the grid when excess pressure gases formed in the combustion of fuel in the case of thermogenerator above the downhole well pressure generated after activation of the shaped charges in a body punch. On FIGU presents the passage of the current-carrying conductor 12 blast circuit device through the axial channel of the connecting node 7, the channel is sealed with a rubber stopper 13, sealed on both sides with bolts 14.

The location of thermogenerator in the device below the casing perforator allows you to more fully ensure the preservation from destruction, especially of the node ignition thermogenerator when exposed to a blast of perforating charges, because the bulk of the energy blast will be directed upwards in the direction of movement of the column of well fluid. When burning the same fuel thermogenerator, in addition, the hot gases are easier to rush up and with less loss of heat fill the space in the casing perforator.

Providing fuel thermogenerator additional piece igniter composition can be used for its ignition regular electric igniter, cha is the mortality electric igniter heat-resistant type EI-2T, can operate as an explosive cartridge in the hammer, from the same nominal device (via cable) at the wellhead, in particular, explosive high-frequency device type UIP-1. Thus, is the simultaneous actuation of cumulative perforating charges and fuel thermogenerator, while the method and apparatus prototype sync them cannot be made as to ignite the powder fuel thermogenerator used the spiral filament, not uspevaya be fired from the standard device used for effecting an explosive chain punch.

As the igniter composition additional checkers fired from a regular electric igniter and, in turn, flammable proposed invention the fuel thermogenerator, can be used, as shown by experiments, the recipe, which includes, % wt.:

The ammonium nitrate grade B70
The bichromate of potash10
Epoxy resin grade ED-2013,2
The plasticizer Agidol grade ADOS1,6
Hardener brand AF-2M5,2

An additional piece igniter of the composition of this formulation is not capable of detonation material and refers to the hazard class 4.1.

The supply holes of the lattice connector plugs in the form of a solid metal disk sliding fit and the elastic tube closely adjacent to the end face of the disk and the wall of the bore, allows, on the one hand, a reliable sealing of the holes of the lattice when firing shaped charges in the body punch and, on the other hand, light and full disclosure of these holes in the grid when excess pressure gases formed in the combustion of fuel in the case of thermogenerator above the downhole well pressure generated after activation of the shaped charges in a body punch.

The proposed method of perforation and treatment of a well with a device for its implementation is as follows. On wireline descends into the well-prepared device, consisting of a corpus-shaped punch, in which the lower part is connected via a connecting node thermogenerators. The device is positioned so that the punch was placed in the field of the processing interval of the productive formation. From PCs is these device on the mouth, in particular, explosive high-frequency device type UIP-1, serves an electrical impulse at the same time on the explosive cartridge in the gun and to the staff of the electric igniter, in particular electric igniter heat-resistant type EI-2T in the fuel thermogenerator.

Upon actuation of the punch shaped charges 3 (Fega) knock out plugs out of the holes 2 in the body punch 1 and create perforation tunnels in the reservoir. During actuation of shaped charges and a pressure products of their explosion in the body punch hole grille connecting node are in a sealed condition due to a stub in the form of a solid metal discs 10 and elastic tubes 11. At the same time when ignited through an additional piece 8 and the subsequent combustion of the fuel 5 thermogenerator made of mixed composition capable of generating a gas with a predominant content of chemically highly active hydrochloric acid, is fast filling this gas casing 6 thermogenerator.

After reaching in the body punch pressure in excess of downhole jet fuel gas flow through the holes of the punch directed to the pre-formed perforation channels. The impact of the jets of gas in the perforation tunnels in the reservoir occurs in view of the multiple pulse pressure, conducive to hydraulic fracturing, i.e. discovering and developing cracks around the perforations. Simultaneously, as a result of chemical action of gases containing high-temperature hydrochloric acid, at skeleton rock, and thus further increase the size of the channels and cracks, as well as resultnat wall perforation, leading to increase in surface filtration in the surrounding channels the reservoir.

The performance of the proposed method and device for its implementation is confirmed by the results of bench tests on the plant, simulating downhole conditions. Setting (see, e.g., RF patent №2114984, are recorded. 10.07.1998) is an elongated vessel-skarinou high pressure inner diameter of 122 mm, filled to a certain level with water and sealed with a lid. Height adjustment of the air space above the water level to achieve the magnitude of the operating pressure in the vessel is smaller than the threshold. In the body of the vessel is a pressure sensor for registration of the change in the pressure vessel in time. For bench testing used the device structure corresponding to figure 1, except that the body punch made shorter and with one plugged the hole, and before him, because of the impossibility of placing suck in the e sample reservoir, for simulation of shaped charge type SPCM-105 PP posted similar in size and weight of the explosive charge, is made of checkers phlegmatized HMX diameter of 30 mm and a weight of 22 g, cut the detonating cord and the explosive cartridge type PV-4. Through a body punch conducted two electric wires, one of which is connected to an explosive cartridge, the other passed through the Central hole of the connecting node and sealed therein by means of a rubber tube and bolt with the Central channel.

To the lower end of the body punch attached housing thermogenerator via a connecting node in the form of a lattice plugged the holes. The connecting Assembly is provided with plugs in the form of a metal disk and a flexible rubber tube.

As the fuel thermogenerator used a mixed composition comprising, in wt.%: the ammonium nitrate grade B - 70, bichromate of potash - 10, epoxy resin grade ED-20 - 13,2, plasticizer Agidol grade ADOS - 1.6 and hardener brand AF-2M - for 5.2. Fuel thermogenerator is driven from a regular electric igniter type EI-2T. The assembled device is installed in a prepared poster installation. From the remote control through the blast machine - explosive high-frequency device type UIP-1 - electrical impulse to combine the time on the explosive cartridge punch and electric igniter fuel thermogenerator.

The results of bench tests in the form of the dependence of the change in vessel-well in time are presented in figure 2. Originally registered to a single pulse of high amplitude (phase I) from the explosion of the explosive charge, simulating the cumulative charge. During the downturn of this amplitude pressure gaseous combustion products of thermogenerator begins to exceed the pressure in the body punch, thanks to this open hole of the connecting node. The gases of combustion pass through them into the body of the punch and start to expire from the window of the housing in the borehole. While flowing gases create multiple pressure pulses with slightly increasing amplitudes until the end of the fuel combustion process (stage II). After combustion of the fuel (stage III) generated pressure pulses propagate with decreasing amplitude.

Gaseous products of combustion of thermogenerator, mainly containing hydrochloric acid, stood out in the downhole fluid, as shown by the analysis, with the content of hydrochloric acid in the amount of 57% by weight of the fuel.

Thus, as the test showed, when used in fuel thermogenerator standard electric igniter with an additional piece igniter composition is implemented simultaneous launch PE is fortora and thermogenerator from one and the same time an explosive device. When this supply holes of the lattice connecting node a metal disk and a flexible tube securely seal these openings upon actuation of the explosive charge in the body punch, then disclosure of the holes when the pressure exceeds the gases generated during combustion of fuel in the case of thermogenerator, above the pressure in the vessel is well. Gaseous products of combustion of fuel consisting of the proposed invention compositions, generating hydrochloric acid, quickly fill the body punch and through his window flow into the borehole, producing effects in the form of pulse pressure. The technical result confirms the possibility of realization of the essence of the present invention.

Used sources of information

1. U.S. patent 5355802, 18.10.1994.

2. RF patent №2179235, 10.02.2002.

3. RF patent №2162514, 27.01.2001.

4. Wolkow and other Mathematical modeling of implosion stimulation. - Kazan: publishing house. "Pluto", 2004, C.11-16, 22-26.

5. The decision to grant a patent from 01.10.2009 by application No. 2008109091 priority from 07.03.2008.

6. RF patent №2334873, 27.09.2008.

1. Method of perforation and treatment of bottom-hole zone of the well, including perforation of the well painted with a hammer, subsequent fracturing, using for this thermogenerator by its launch, implementation is tvline by burning its fuel gas evolution, falling through the connecting node in the body punch and directional jets impinging on a pre-formed perforation channels, characterized in that thermogenerator as fuel use is not capable of detonation mixed composition on the basis of oxidizer and fuel, capable of combustion to generate a gas with a predominant content of chemically highly active hydrochloric acid, for example a well-known composition, comprising, by wt.%:

the ammonium nitrate grade B32÷33
hexachlorethane58÷57
PVC resin chlorinated brand PSC-HP10,

which produce a chemical effect on the skeleton of the breed, and thus further increase the size of the channels and cracks, resultnat wall perforations and provide a growth surface of the filter in the surrounding channels the reservoir, and the effects of gas on the perforation tunnels in the reservoir is produced in the form of pulse pressure.

2. Device for punching and processing bottom-hole zone of the well, comprising a body punch plugged the holes, accommodated is it shaped charges with a device for their operation, thermogenerator attached via a connecting node in the form of a lattice plugged the holes to the body punch and characteristics of thermogenerator and the total area of holes in the lattice is chosen to ensure that the fracture pressure created by combustion of thermogenerator jets of gas directed from the open hole punch directly in the pre-formed perforation tunnels in the reservoir; to assess the nature of the impact and operation of the device it is fitted with sensors of temperature, pressure and for determining the location of the instrument in the well - locator, characterized in that thermogenerator the device is located below the casing perforator, for simultaneous launch punch and thermogenerator the latter is provided with an additional piece igniter composition and a regular electric igniter, for example, type EI-2T - electric igniter heat-resistant, triggered as the explosive cartridge in the hammer, from the same regular fixture on the mouth, for example, explosive high-frequency device type UIP-1; the grid openings of the connecting Assembly is provided with plugs in the form of a solid metal disk and an elastic tube with sealing holes resh the TCI when firing shaped charges in the body punch and disclosure of these holes in the grid when excess pressure gases, formed during combustion of the fuel in the case of thermogenerator above the downhole well pressure generated after activation of the shaped charges in a body punch.



 

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15 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: perforator comprises a bearing structure, where jet charges are installed as arranged in groups, at the same time the charges forming groups consisting from three charges, are arranged relative to each other at a certain angle in different planes, and the angle between the groups of charges is determined depending on the selected angle in the group of charges. The specified groups of charges are arranged in different planes.

EFFECT: invention provides for maximum area of opening charges of the producing formation with jets in a cross section of a well.

4 dwg

FIELD: military equipment.

SUBSTANCE: inventions refer to hollow charge and perforating system using this charge. Hollow charge consists of charge jacket (1), liner (5) and main part of explosion agent (2) located between the charge jacket (1) and liner (5). At this the charge jacket (1) and liner (5) form energy material. Energy material is chosen of the group consisting of rocket propellant, oxidant and their combination, ammonium perchlorate and potassium perchlorate or their combination, so the possibility is ensured to change the state of energy material from solid agent to vapor-phase mixture upon launching. Energy material contains supplements of wolfram or magnesium or their combination. Perforating system includes perforator body and unit of the mentioned hollow charge.

EFFECT: increased penetrating performance of charge and perforator.

5 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: hollow-carrier cumulative perforator consists of sections and frame with cumulative charges. Each section consists of tubular housing and connecting sealing external coupling, which form full-passage through cavity when being screwed together. Frame with cumulative charges is installed in cavity of tubular housing, with attachment assembly of frames to common uninterrupted garland without any breaks with common detonating cord. Frame is made of heavy diverting segment with light-weight cassette with installation seats of charges, which is connected to it and which orients the charge rows relative to the segment. Garland is fixed in swivel device above upper section of perforator.

EFFECT: improving operating quality and reducing the manufacturing costs of oriented perforation.

6 cl, 6 dwg

FIELD: gas and oil production.

SUBSTANCE: procedure for perforating operations in well consists in transportation of cumulative perforator on cable into required interval of well, in its orientation, in successive actuation of cumulative charges of perforator and in formation of channels oriented in required position for fluid inflow in casing and rock. A gravitational orientator with set off gravity centre is connected to the perforator before transportation into a required interval to facilitate a required position in the well. Position of the gravitation orientator relative to the perforator and charges is fixed. Orientation of the perforator in the well before its actuation is performed by means of the gravitational orientator and a cable.

EFFECT: raised efficiency of facilitation of required position of perforator in well, reduced time and expenditures for its orientation.

2 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: device consists of tubular case with hollow internal channel, of built in loading tube designed for installation in channel of case and containing receiving reservoir of initiator with radio frequency safety device, of receiving reservoir of electric wiring, of receiving reservoir of cumulative charge and of receiving reservoir of detonating fuse. The initiator with the radio frequency safety device is installed in the corresponding receiving reservoir of the loading tube. Electric wiring is made in the corresponding receiving reservoir of the loading tube and is connected to the initiator with the safety device. The cumulative charge is installed in the corresponding receiving reservoir of the loading tube. The detonation fuse is placed in the corresponding receiving reservoir of the loading tube and it connects the cumulative charge to the initiator with the radio frequency safety device. The initiator with the radio frequency safety device, electric wiring, the cumulative charge and the detonating fuse are installed in a position different from the position of a well.

EFFECT: raised reliability of perforator.

3 cl, 5 dwg

FIELD: oil and gas production.

SUBSTANCE: cumulative charge of perforator consists of case where in there is arranged axisymmetrical blasting cartridge of explosive substance with open cavity. Also, a cumulative coating adjoins surface of the cavity. The coating consists of conical and spherical or elliptical cumulative sections conjugated to each other. The conic cumulative section corresponds to a top of the cumulative coating, while spherical or elliptical cumulative section has lengthwise cumulative grooves.

EFFECT: increased inflow of oil or gas into cavity of pipe of well due to increased specific area of opening of casing at maintaining sufficient depth of perforation.

2 dwg

FIELD: oil and gas production.

SUBSTANCE: unit retaining position of booster and detonating cord in device for transfer of detonation consists of bushing in form of cylinder portion with axial orifice, and of disk with orifice and collar inside orifice. The unit is equipped with a nut with an internal conic shaped portion. A cylinder portion on the end counter relative to the disk has a leaf-type collet. On external side of the cylinder portion there is made thread whereon there is screwed the nut enveloping the leaf-type collet with internal conic-shaped portion.

EFFECT: increased reliability of retaining position of booster and detonation cord.

7 cl, 10 dwg

FIELD: gas-and-oil producing industry.

SUBSTANCE: one-use cumulative perforator consists of at least two charge sections serially interconnected, of tip, of independent head and of sub. The independent head encases an explosive cartridge and is connected to a cable head. The sub connects the independent head with charge sections. Detonation from the explosive cartridge to the charge sections is transmitted by means of detonators-amplifiers installed in the independent head and the sub correspondingly.

EFFECT: simplification of equipment and assembly of perforator, increased safety, unification of used dimension-type of charge sections.

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

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