Method of methane extraction from coal seam
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.
The invention relates to a method of producing methane from coal seams by periodic exposure energy plasma connected to a productive deposits and derived from an explosion calibrated metal conductor that leads to the creation of directed short pulses of high pressure in the plasma generator-pulse effect, placed in the working interval of a vertical wellbore, with the aim of creating cleavage radial laterally desorption of methane from coal, water and rocks.
It is known that all known methods of extracting methane gas from coal seams consist of:
- the washing away of the reservoir around the well by spontaneous outbursts of coal and gas;
- induction and maintenance of self-destruction with the formation of the collector zone by hydrodynamic effects;
- injection into the coal seam water and air, and carbon dioxide;
- methane production from horizontal wells with preliminary degassing and dewatering of coal seams;
- the formation of cavities around the well;
- extraction of methane gas through degasification wells;
the fracturing of coal seams
(Methane Paradise Gazprom. Gas companies are embracing the technology of extraction of methane from coal seams. (publication about business and technology). - 10.02.2010, Especially early degassing Hugo is lnyh seam gas (CSG) drilling a borehole from the surface (UDC 622.17.47(73)(061.3) / the Answers to the questions "glückauf", Paul Sikora, Denis Meanings, Olga Plenet. - Details. No. 1. - March 2008; and GM A.I. Geological-industrial resource assessment of methane from coal basins of Primorye/the dissertation on competition of a scientific degree of candidate of technical Sciences Vladivostok, 2006).
However, these methods are costly, time-consuming, environmentally unsafe, energy-consuming and inefficient.
There are also known methods in the patents US 2005/009831 A1 and US 2006/0108111 A1, offering physical and acoustic impact on the coal seam from the surface and acoustic emitters placed in a vertical well.
However, the impact with the surface (US 2005/009831 A1) energy-consuming and energy generated broadband oscillations decays with increasing depth layers. In addition, these impacts are environmentally unsafe, near faults can lead to unpredictable consequences.
Acoustic emitters (US patents 2005/009831 A1 and US 2006/0108111 A1), placed in a vertical well to increase permeability, emit one frequency, while Metropolia Deposit is a multifactor, nonlinear, dynamic system that constantly go undamped multi-frequency oscillations to highlight the dominant frequency is not possible and, therefore, to solve the problem of increase of pronic is emaste at a considerable distance from the excitation source.
All known methods of extraction of methane based on the principles of linear physics, linear dependence, when the coefficients in the mathematical functions are constant.
A distinctive feature of the proposed method is that it is unique, because it is based on the principles of nonlinear physics, when the coefficients in the mathematical functions depend only on time. In addition, the proposed method is highly efficient, environmentally friendly, energy-efficient, technologically simple, safe in operation and requires no capital expenditure.
Technical result achieved in the implementation of this invention is to increase the amount of produced gas, with minimum energy consumption and high security process.
The technical result is achieved due to the fact that carry out:
- drilling vertical wells in place of methane-coal deposits (either using old developed/undeveloped well),
- determination of the layer thickness in the borehole,
- determination of the grade composition of coals,
- summing up to a methane-coal deposits through the working interval of a vertical borehole source of periodic aimed short pulses of high pressure
- influence on the formation energy of the plasma formed by the explosion of kalibawang the th metal conductor, in the form of periodic aimed short pulses of high pressure, while the number of pulses of high pressure and the duration of exposure in each interval of methane-coal deposits is determined by the capacity of the reservoir in terms of wells and grades of coal.
Methane extraction the proposed method is not unloaded from the mountain-pressure methane-coal deposits through vertical wells drilled from the surface, lined with different diameter exploitation columns, as well as in uncased wells.
Methane-coal field is considered as a natural, multi-layered, non-linear modulus of volumetric elasticity, containing non-equilibrium gas-liquid dynamic environment consisting of several phases that interact with each other, including through artificially created plasma periodic short pulses of high pressure, penetrate each other; as a result, the density, viscosity, elasticity, rigidity, electromagnetic, and physical-chemical properties vary both in space and in time.
Not unloaded from the rock pressure of the coal reservoir is a porous system, less dense than rocks. The mechanical strength of coal is much lower than in other breeds: he is not able to withstand high g is adient pressure, not being destroyed. Coal beds are in a state of stress and having low permeability, high conductivity, and good dynamic resonator.
In a non-equilibrium system is constantly present continuous keywords. fluctuations caused by natural energy from outside (tides, remote earthquakes, blasting in coal mines and mines), which oscillates molecules of water saturated with methane. Film of water with dissolved methane permeates the entire productive stratum. In addition, methane gas is present in coal and rock, is in the gaseous, liquid and solid state on the surface of the particles. The methane content in the coal varies in a wide range from 5-10% in brown coal, 15-35% in coals up to 40-45% in shales.
According to Henry's law, the dissolved methane gas in aqueous solutions increases directly proportionally to the increase in pressure with depth. Rock and coal behave in depth as a viscous liquid. The presence of water makes the whole system as it is amorphous, in which the free energy in terms of the external load is equal to zero.
The value of the critical pressure, called the burst pressure of the coal seam, depends on the depth, mechanical fortress, the specific weight of the overlying column of rock. To anitelea burst pressure strength of adhesion between the individual layers and packs of coals care as a rule, 1-2 MPa.
The main feature of non-equilibrium, dynamic systems, which include any methane-coal stratum, is the fact that broadband, short plasma periodic high-pressure pulse, supplied to the system by the energy of the plasma leads to a significant perturbation in the near and remote areas of the drainage. Coal, having a good conductivity, is transmissive medium for the acoustic waves, and the conductivity of a substance depends on its density and elasticity, increasing with increasing density of the conducting medium.
1 shows a diagram of the periodic impact energy of the plasma in the coal stratum. Here is the finished bore (pre-drilled), determine the capacity of the reservoir in the well section, find out the grades of coal, and then fail to methane-coal deposits through the working interval of the vertical hole, a source of periodic aimed short pulses of high pressure and start the stimulation, in the form of periodic aimed short pulses of high pressure, while the number of pulses of high pressure and the duration of exposure in each interval of methane-coal deposits is determined by the capacity of the reservoir in terms of wells and grades of coal. Source periodic direction is by short pulses of high pressure affects the energy of the plasma, formed by the explosion of a calibrated metal conductor. Essentially, the source of periodic aimed short pulses of high pressure is a plasma generator-pulse exposure. Usually this source is as follows. The high voltage current - 3000-5000 - on battery capacitor is supplied to the electrodes, which are closed calibrated conductor that leads to the explosion and the formation of plasma in a confined space. During the explosion is the release of energy, which is converted into a state of very hot gas with a very high pressure, which, in turn, strongly affects the environment, causing its movement. This source emits a significant amount of energy at high temperature (25000-28000°C) for a short period of time (50-53 ISS), generates a shock wave with a pressure significantly higher than the reservoir.
When initiating periodic wideband short pulses of energy of the plasma in the working interval of the well is capture the dominant frequency, which leads to the effect of nonlinear self-action initiated by the waves at the fundamental frequency when changing the amplitude and frequency of the waves is due to the intensity of the wave, prevails over the effect of the generation of the highest shall harmonic.
Under the action of a harmonic driving force in the dynamic system with nonlinear restoring force always exists a stationary oscillations with angular frequency equal to the frequency of driving force. As a result of synchronization of oscillations in the coal deposits of developing abnormal microresonator vertically and stretch. Released by cleavage of the coal rocks and the allocation of water gas methane appears in the form of bubble zones. Effects occur flotation and cavitation, which leads to teplomassoobmena and further development of microcracks without violating the reservoir properties.
When the methane from the water and then formed a bubble environment, the role of vibrational forces on the basis of the Reynolds equations play a turbulent stresses. Bubble environment acquires other properties. The coefficients of reflection, absorption and refraction of completely changing their features, and all the acoustic vibrations are low frequency with a slow decay. Although gas has the lowest conductivity, low-frequency vibrations can travel considerable distance, which leads to an increase of the flow rate of methane gas not only in the treated wells, but also in neighboring wells.
After termination of exposure chemomodulatory system due to the given stake is any will emit bubbles of gas for a long time, involving a significant drainage area.
Unlike oil and natural gas filtering methane is not subject to the law Darcy. Therefore, when the output of the wells on the mode of operation should be guided by the law of Boyle-Mariott, namely: the ratio of gas volume (V) with time (t) it expires.
The rate of withdrawal wells in operation, as well as pre-exposure depend on the type of coal, gas saturation, depth, thickness of coal seams, and well design.
The proposed method can be used in vertical, drilled from surface wells, after secondary opening or wells with open face, as well as in wells which have been applied by other known methods, but the well productivity remained low or absent.
The above outlines the main features of the method of extraction of methane from coal seams, but the person skilled in the art it is obvious that on the basis of disclosed data, you can create variations of methane production from coal seams.
The method of extraction of methane from coal seams, including:
- determination of the layer thickness in the borehole,
- determination of the grade composition of coals,
- summing up to a methane-coal deposits through the working vertical interval is quaini source of periodic aimed short pulses of high pressure,
- influence on the formation energy of the plasma generated by the explosion of a calibrated metal conductor, in the form of periodic aimed short pulses of high pressure, while the number of pulses of high pressure and the duration of exposure in each interval of methane-coal deposits are determined by the capacity of the reservoir in terms of wells and grades of coal.
SUBSTANCE: proposed method comprises drilling of degassing walls directed to mining face, performing of coal seam interval frac therefrom and tapping of released gas Degassing wells are drilled in ascending direction from mounting chamber and face entries cut across extraction pillar till exit to adjacent face entry board. Interval frac is performed with the use of Novec 1230 fluid. Then, degassing well mouth is sealed while released recess is discharged by its free outflow from said wells to degassing circuit.
EFFECT: intensified coal seam gas recovery.
SUBSTANCE: high coal degassing comprises the steps that follow. Paired gateways are drilled over bed top layer and communicated by linkages and spaced apart diagonal board gates separating the blocks in parts. Wells are drilled from paired gateway top works in bed top layer plane and series of parallel wells are drilled to bed bottom layer from paired gateway bottom works. Said wells are connected to degassing pipeline. Note here that this method comprises an extra step whereat the system of parallel wells is drilled from cu diagonal board gate along the block and directed to mining face. Note also that methane from wells drilled in the bed top layer plane is derived by sections to near linkage via pipeline laid in upper paired gateways and that in linkage between paired gateways to section pipeline laid in lower paired gateway.
EFFECT: decreased methane release, higher safety.
SUBSTANCE: invention relates to current forecast of methane release into developing entries and may find wide application during automated current forecast of methane-bearing capacity as linked to data of remote supervision of content in an entry. The method is proposed to process remote measurements of methane concentration for current forecast of air flow during entry ventilation, including separate definition of methane concentration in periods of combine operation and with absence of coal extraction with a conveyor being unloaded. The current forecast is carried out on the basis of measurements of dynamics of methane concentration and air flow for ventilation of the mine with account of mathematical dependence including actual air flows during measurements of methane concentration and coefficients of proportionality of methane release by sources for actual and design lengths of the entry.
EFFECT: increased validity of air flow forecast for ventilation of an entry as its length increases.
SUBSTANCE: method refers to the field of mining industry, to coal mining industry in particular, and may be used during development of coal beds prone to spontaneous ignition. The method used during development of coal bed prone to spontaneous ignition includes preparation of extraction section by double workings, ventilation of wide section workings due to mine ventilating pressure drop and coalmine methane extraction from emission source. Methane is extracted first through drilled at superimposed beds methane drainage boreholes with possibility of air inleakage exclusion from bottom-hole region of active stope. Then after displacement of developed bed main roof mine rocks, methane is removed through the rest part of borehole length in modes excluding air inleakage from bottom-hole space of long face. Methane, evolving hard from developed bed zones released from overburden pressure near long face bottom-hole, is offtaken to degassing vacuum network of extraction section through formation wells drilled oriented on working face with methane concentration fit for disposal.
EFFECT: improving mining safety during development of coal beds prone to spontaneous ignition.
3 cl, 4 dwg
SUBSTANCE: invention refers to mining, mostly to coal mining, and may be used for hydrodynamic action on coal bed and its deep degassing. Method of action on coal bed includes well bore construction in coal bed, its mouth casing, fluid injection into coal bed in static and pulse modes, well bore connection to degassing equipment and gas removal. Fluid injection into the coal bed in static mode is performed before and after hydrodynamic action on coal bed. Before hydrodynamic action fluid is injected up to pressure equal to gas pressure in bed, and after hydrodynamic action - under fluid pressure equal to coal bed hydraulic fracturing pressure.
EFFECT: improving efficiency of action on low-permeable coal bed and increasing volume of gas removal from it.
SUBSTANCE: proposed group of inventions refers to mining industry and is meant for methane removal from low concentration gas in coal mines. Methane removal method from gas in coal mines includes the following stages: (A) initial engagement of the plant oxidation reactor, fulfilment of the null cycle of methane oxidation reaction and heating start to the temperature not below 800°C; (B) low concentration gas with methane supply to oxidation reactor, quick reaction of methane with oxygen and heat release; (C) accumulation of heat released upon reaction; (D) after oxidation reaction completion exhaust gas blowing-out from oxidation reactor to complete treatment; (E) reiteration of (B), (C), (D) stages. Also provided is a device for methane removal from gas which contains check valve assembly, oxidation reactor, return valve assembly, gas supply system and instrumentation system. Check valve assembly is installed with oxidation reactor. Check valve assembly and oxidation reactor are connected to return valve assembly and gas supply system.
EFFECT: providing possibility of methane removal from gas using oxidation reaction of low methane quantity in gas at high temperature.
10 cl, 3 dwg
SUBSTANCE: complex control method of gas emission at development of a thick coal bed consists in separation of the same bed as to thickness into upper and lower beds so that an interlayer patch is left between them, development of methane drainage boreholes for each bed, ventilation and belt entries with further removal of return air and gas mixture at development of the bed. At development of similar entries in upper and lower beds, their pair connection with runs is performed. After outlining of extraction pillars the ventilation entry of the lower bed is connected through an end-on mine working to a gas suction plant. As the upper bed development proceeds, the runs that are the closest to its working face are opened in turn for entry of air from the belt entry and discharge of gas mixture from upper connection of the working face of the upper bed through a return air outlet system and through the ventilation entry of the lower bed to the end-on mine working, and after that, to the gas suction plant. Then, the lower bed is developed; with that, after operation of the methane drainage borehole of the lower bed is finished, the lower bed is saturated through the above borehole with antipyrogens.
EFFECT: improving control efficiency of gas emission in order to provide high productivity and safe extraction of coal and methane.
SUBSTANCE: coal formation sections to be degassed are penetrated by wells so that they cross maximum number of natural fractures over both the entire length and thickness. Note here that pulp formed in drilling is discharged by gravity into operating drifts at, at lest 2-3 degrees to rule out water overpressure in wells and its ingress into formation. Then, wells wherefrom methane releases are connected to degassing pipeline system to output methane to surface, to vacuum station and, further, to consumers.
EFFECT: higher efficiency of coal formation degassing.
SUBSTANCE: method includes drilling from the surface of wells and their connection with vacuum and recycling systems. At the same time drilling of degassing wells is carried out to the mined bed in places of meeting and crossing of the line of the angle of full displacement of the geomechanical layer, where the degassed bed is located, and to the degassed bed, and of methane-producing wells - in places of crossing of lines of angles of full displacement of appropriate geomechanical beds of higher levels of hierarchy at their established sufficient gas content.
EFFECT: increased efficiency of degassing and methane production.
SUBSTANCE: method consists in identification of a length of active gas release zones, preparation of extraction pillars by tunnelling and strengthening mines in the rock massif, mining of extraction pillars and removal of methane in degassing wells. At the same time the length of active gas release zones is defined by variation of volume deformations of rock massif. At the same time the values of volume deformations of rock massif are produced by numerical methods on the basis of analysis of components of deformation and stress tensors with account of the time factor. The tensor characteristic is gas permeability of rocks under conditions of their natural occurrence. Medium values of rock massif gas permeability are assessed by the given mathematical expression. After determination of length of active gas release zones, with account of produced data, schemes of well drilling, their diameter and number are selected.
EFFECT: increased efficiency of methane removal, higher load at a working face and increased safety of clearing works by gas factor.
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.
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
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.
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.
FIELD: oil and gas industry.
SUBSTANCE: excess pressure is created in the well by acting on the formation with gaseous combustion products of frameless cylindrical solid-fuel charge having igniter, central round channel and solid-fuel segments projecting on opposite cylindrical surfaces parallel to axis of central channel, with longitudinal slots made in them for the rope of the assembly device, and the distance between slots, which is equal to outer diameter of cylindrical part of charge. According to the invention, excess pressure controlled as to amplitude and duration is created in the well without deformation and fracture of charge, which is caused with excess critical pressure of combustion products in cavity of its channel relative to the charge environment. It is achieved by installation opposite the formation or near the formation of charge with through central round channel having the ratio of channel length to its diameter, which is equal to (22-38):1. Increase in duration of action on formation at decreased pressure is achieved by attachment to that charge of additional cylindrical solid-fuel charge with similar projecting segments with slots and its length-to-diameter ratio equal to (5-15):1 with straight end faces or with a groove on the end face. At that, ignition of additional charge in the well is performed from igniter of lower charge with through channel or from igniters of charges with through channels, which are located from above or from below of additional charge. Current supply wires from geophysical cable to igniter are passed through the channel or longitudinal slots of segments of charge having a through channel, and longitudinal slots of segments of additional charge.
EFFECT: increasing treatment efficiency.
2 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves well perforation using a hollow-carrier perforator and further fracturing of formation using thermal gas generator, emission of gas during combustion of its fuel, which is supplied through the connecting assembly to perforator housing and directed jets acting on the formed perforation channels. As thermal gas generator fuel there used is mixed composition that is not detonable, which generates the gas during combustion with major content of chemical high-activity chlorhydric acid owing to which there created is chemical influence on the rock matrix and thus the sizes of channels and cracks are increased, walls of perforated channels are sealed and growth of filtration surface in productive formation is performed; at that, gas action on perforated channels in the formation is performed in the form of pulse pressures.
EFFECT: increasing formation perforation efficiency together with start-up in common perforator device and thermal gas generator, at combustion of fuel of which high-activity chlorhydric acid is formed.
2 cl, 4 dwg
FIELD: oil and gas production.
SUBSTANCE: proposed pressure generator is intended for encased shaped-charge perforators, implosion devices and powder generator devices arranged on cable and made up of integral tubular lining charge to be secured on device case of cable surface. Said charge is composed of fragments secured on device case or cable surface, arranged one after another. Note here that said fragments are made from rod elements of ballistic artillery powder shaped to uniform tubular structures by gluing outer side surfaces of powder elements by nitrocellulose size.
EFFECT: higher completeness of powder charge combustion and efficiency.
FIELD: oil and gas 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