Device for productive formation treatment with propellant charge and bag

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


We offer the downhole device is related to the oil and gas industry and can be applied in other areas. The basis of the device are solid fuel charges (TTZ). When combustion is thermal gas and chemical impact on the bottomhole zone of the formation to increase permeability and tributaries.

A method of processing reservoir and a device for containing the TTZ and the snap-in connection cable [1]. The method sets the characteristics of the pressure pulses when creating excessive pressure in the well. In the channels TTZ has the support tube with the ignition system.

Known planar sectional specification for gas-dynamic stimulation [2]. It includes powder section, the node ignition and accessories, located in the Central channel of each of the powder sections and details for tightening the sections to each other.

The presence of tubes with snap [1, 2], passing through the axis of the TTZ and other accessories provide a certain rigidity to the device. The disadvantage of this analogy is the deformation of the elements of the composite charge with long-term exposure to elevated temperature (up to +100°C). They become softer due to the sharp decrease in the elastic modulus. As a result, the ignition may be broken or have non-nominal modes of combustion, caused the destruction of a charge.

Known gas generator solid fuel with adjustable pulse stimulation [3]. He has a tubular TTZ and carrying geophysical cable with fastening elements of the design. Available TTZ protective coating provides burning them only with the Central channel. This leads to undesirable deformation TTZ caused by the increased pressure of the combustion products in the channel. The protective coating is not completely burned. It remains pollute the well after combustion TTZ.

The prototype is a device for processing a productive formation [4]. It has a frameless TTZ-through channel and the ratio of its length to diameter (22-38):1, which allows to use shorter with increased arch of the fuel. Such charges less deformed under high temperature. However, the risk of deformation remains. This limits the use of the device at these operating temperatures.

The task of the invention is such revision device specification, which will increase the reliability and efficiency of its operation at high temperature effects by reducing deformation of the charges and save the form when placing them in a rigid combustible Kartuzy (HBC).

For specification of recycled rocket ballistic charges of gunpowder or the respective powder mixtures material the HBC without deformation must withstand temperatures of +100°C. For mixed formulations of this temperature should be +150°C. the exposure Time HBC during the descent of the device in the well to ignition and subsequent combustion TTZ should be not less than one hour. While HBC should be completely burned.

The task provided that the device for processing of the reservoir, coupled with a cable-rope, open frame contains a cylindrical propellant charge igniter and snap, while the solid propellant charge is closed rigid combustible cap, minimizing deformation of the charge at elevated temperatures in the borehole and the allocation of additional amounts of energy, while the composition of the hard burning of the cap includes the following components, wt.%:

thermosetting polymer composition - 30...37;

pyroxylin fiber - 18...22;

explosive - 42...48 and

over 100%:

ethyl alcohol - 10;

the wetting agent is 0.1.

Thermosetting polymer composition may be represented, for example, in the form of elastic viscous acrylate binder - oligomer D-TM, oligoadenylate TGM-3, methyl methacrylate, benzoyl peroxide. Named components can be used either in the amount or exception, for example, one of them in different quantity combinations. As explosives can be used, for example, the R, RDX or HMX, or tetryl. As the wetting agent can be used Penta 69 or formalistically, or glycerol. As an option as a Supplement to the claimed compositions can be used, for example, porofor in the number of 0-3 wt.%. All these substances are individually known and described in the technical literature (see, for example, Khmelnitsky LI Handbook of explosives, Moscow, Chemistry, 1962; Braginsky, VA and others, plastics Processing, reference manual, Leningrad, Khimiya, 1985).

The method of manufacture. HBC, consisting of a high modulus polymer composition is produced by special technology. Powder weight pyroxylin fiber or a mixture of cellulose fibers is introduced into the aqueous polymer composition of thermosetting binder. As explosives add fine RDX or HMX and mix the mass. From the resulting premix is formed into billets, dried, subjected to hot-pressing. The tensile strength of HCC after cooling and raspredeleniya is not less than 16 MPa. The modulus of elasticity is much larger in relation to the specification and up to 500 MPa. The burning rate HBC is in accordance with the performance specification.

HBC has the shape of a cylindrical Cup with a wall thickness from one to several millimeters. He placed a charge in the region have the minimum clearance from HBC. On the bottom axis of the glass predusmorenno hole. Elements HBC may partially or completely overlap the inner surface of the Central channel of the charge or part of it. Rope snap device is outside of the TTZ in its longitudinal grooves inside HBC. Rope or anchor pipe axis specification are also within HBC placed in the channel charge.

In figure 1 the example shows the structure of the downhole device having a planar channel cylindrical battery 1 and the igniter 2. The charge is closed from high temperature cap 3 and is connected to the cable by the cable 4. The rope 5 passes outside of the charge along its longitudinal grooves. The cap remains on the outside, not letting the rope out of the grooves during the descent into the well.

The device operates as follows. Before descending into the well it is collected from the individual TTZ placed in HBC. The assembled device with TTZ lower in the selected interval of the formation in the zone of high temperatures.

With increasing temperature specification by reducing the elastic modulus and the subsequent developing deformation under its own weight choose a constructive gap between specification and HBC. These provide hard contact between them. Strength HBC ensure the stability of the shape of the combined charge. This reduces deformation of the TTZ and ensures normal is xploitation characteristics of the device.

The presence of the powder mass of explosive substance in the composition of the HBC provides additional thermal energy. Layer more warming up, increase the tributaries of the downhole fluids. Processing efficiency is increased.

The combined charge (HBC) is offered in any of geological and technical conditions of the wells, including at elevated temperatures.

Sources of information

1. RF patent №2106485. IPC E21B 43/263. The method of processing bottom-hole formation zone and device for its implementation. Red-cheeked SCI, samoshkin VI, Sanshou L.G. and other Appl. 25.08.1995, Publ. 10.03.1998.

2. RF patent №2183740. C1, 6 E21B 43/263. The caseless charge sectional for gas-dynamic stimulation. The Paderin MG, Gazizov F.M. and other Appl. 22.08.2001. Publ. 20.06.2002.

3. RF patent №2175059. MCI E21B 43/263. The gas generator solid fuel with adjustable pulse for stimulation. Krushenko E, Gribanov NI, Gaivoronsky I.N. and other Appl. 06.10.1999. Publ. 20.10.2001.

4. RF patent №100554 for a utility model. Prior. 16.07.2009. Publ. 20.12.10. Bull. No. 35. A device for processing a productive formation. Pelykh NM, Bogdanov HE is the prototype.

A device for processing a productive formation of a solid propellant charge, coupled with the cable-a cable containing planar cylindrical propellant charge igniter and snap, characterized in that the solid is toplivnyy charge closed rigid combustible cap, minimizing deformation of the charge at elevated temperatures in the borehole and the allocation of additional amounts of energy, while the composition of the hard burning of the cap includes the following components, wt%:
thermosetting polymer composition - 30...37;
pyroxylin fiber - 18...22;
explosive - 42...48 and
over 100%:
ethyl alcohol - 10;
the wetting agent is 0.1.


Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method involves creation of excess pressure in a well by action on a formation with gaseous combustion products of propellant charge. According to the method, at prolonged high-temperature action on propellant charge at its lowering into the well, propellant charge is used together with a stiff combustible cap that contains the following components, wt %: thermoreactive polymer composition - 30…37; pyroxiline fibre - 18…22; explosive component - 42…48 and over 100%: ethyl alcohol - 10; wetting agent - 0.1.

EFFECT: increasing safety of a processing method of bottom-hole formation zone and its efficiency owing to reducing deformation of propellant charge.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to an oil-and-gas industry, ferrous industry, oil and gas wells, water-supply wells, injection wells, and also to blasting works and it is purposed for equipment of powder pressure generators, first of all, capsule-type sealed generators designed for explosion and thermal-gas-chemical treatment of bottomhole formation zone by fire gases in order to intensify extraction of mineral products. Firing device contains blasting cartridge of electric type in protective shell or safe mechanical detonator without initial detonating agent, secondary cartridge of mixed solid fuel placed inside a perforated metal tube and detonating cord in a metal shell or exploding wire placed in a channel of secondary cartridge block at its symmetry axis.

EFFECT: invention allows essential increase in stability of ignition of the secondary and primary charge of a gas generator thus reducing costs for wells retreatment, elimination of expensive equipment and accessories such as exploders, logging cable, and increase in safety of well operations.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: device for thermal gas-hydrodynamic oil and gas formation fracture comprises a logging cable with a cable head and consists of a remote control unit with a gamma sensor, an instrument head, a mandrel sub, a gas-generating charge case and an independent logging unit. The gas-generating charge of a high-energy antiknock solid-fuel composition is presented in the form of sticks of the external diameter of 36-70 mm and the length of 300-1500 mm with an axial passage of the diameter of 5-28 mm with an electrical igniter. The charge is positioned in a case of the diameter of 89 mm with a wall of the thickness of 9-11 mm and a gas outlet channel of the area of 70% a cylindrical surface of the case with end adapters of the diameter of 105 mm. The adapters are used as formation targeting raisers with the efficiency of the dynamic action effectiveness being a multiple greater than uncased gas generators. The real-time pressure and temperature time history is recorded by independent digital devices at the discretion of 8.0-10.0 thousand measurements per second. To provide better emergency tolerance and to make the gas generator advance into wells at a zenith of 90° or more, the multilayered logging cable of the diameter of 8-28 mm and the tensile strength of 60-250 kN is used.

EFFECT: more effective involvement of terminal oil-saturated sites.

3 cl, 2 dwg, 1 app

FIELD: mining.

SUBSTANCE: heat source comprises a body, which is equipped with a composite material that generates gas during combustion and actuates from an electric spiral, and layers of epoxide compound and thiocol-based sealant sealing the ends of the material of the gas-generating composition. The composite material of the heat source that generates gas during combustion contains efficient amount 20 wt % of powdery polyvinyl chloride chlorinated resin of brand PSH-LS at the following ratio of composition components, wt %: granulated ammonium nitrate of grade B - 57.0±0.2; potassium bichromate - 3.0±0.1; aluminium powder of grade ASD-4 - 5.0±0.1; barium nitrate - 15.0±0.2; polyvinyl chloride resin of grade PSH-LS - 20.0±0.2. The gap produced in the outfit between sticks and the body of the heat source is filled with a filling solution capable of hardening. Between the igniter and the composite material the heat source comprises layers of additional igniting composition with the capability of its ignition from the igniter and ignition of the gas-generating composition at the end and along the surface of the heat source channel.

EFFECT: increased safety of operation, transportation and storage of a device for hydraulic rupture of a bed.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves assembly of a pressure generator in the form of a group of cylindrical solid fuel charges with central through channels, lowering of the pressure generator to the well, installation of the pressure generator at the specified depth of the well, supply of a signal for ignition of charges and fracturing of the formation. In the existing casing string of the well, preliminary perforation density is performed as 30-45 holes per running metre, assembly of a pressure generator is performed out of three groups of solid fuel charges with location of charges of the first group below charges of the second and the third groups; the pressure generator is installed in the well above the perforation interval so that ratio of distance between upper perforation boundary and lower charge of the first group to length of perforation interval comprises the value of 0.3-0.6. The first group of charges has a charge with an igniter and total design weight of all charges, which provides the possibility of ignition of above located charges of the second group with the developed combustion surface and gas emission at combustion, which provides opening of existing vertical fractures in the formation and initiation of combustion of charges of the third group, which provide non-reversible deformation of mine rocks of the formation with creation of a residual vertical fracture.

EFFECT: improving filtration properties of the formation throughout its thickness.

9 cl

FIELD: oil and gas 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 industry.

SUBSTANCE: powder channel pressure generator lowered to the well by means of geophysical cable consists of powder charges made in the form of cylinders with a central channel and with holes made in side surface of powder charge, which are connected between the cover and tray by means of a rope. In upper and lower powder charges there installed are glowing filaments electrically connected to geophysical cable. Holes made in side surface of powder charge are inclined towards geophysical cable, and angle between central axis of powder charge and axis of hole in side surface of powder charge is less than 90°.

EFFECT: improving efficiency of action on oil-water formations of solid fuel combustion products; improving installation accuracy of the device at the selected treatment interval; preventing the displacement of powder pressure generator after it is activated.

6 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: gas generator includes the main solid fuel charge, ignition device in cylindrical housing with sealing assemblies in upper and lower parts and fixed piston in upper part of cylindrical housing with possibility of its being cut at the specified external pressure, and temperature promoter. According to the invention, lower end of tubing string is plugged with plate with central hole for installation of hydraulic connection of tubing string and ignition device located in lower part of gas generator. A tube connecting the tubing string to the top of ignition device is inserted into that hole. External perforated housing with solid fuel for combustion transfer to the main solid fuel charge is arranged in addition in ignition device connected to the main solid fuel charge by means of clutch coupling. Lower part of ignition device is plugged with solid fuel plate and cylindrical perforated limit switch.

EFFECT: thermal gas chemical treatment of wells with low flow rate and non-operating oil and gas wells.

3 cl, 1 tbl, 1 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

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling long horizontal wells in bed and effecting on bed through them. Most of bed is covered by these wells. Along whole length of them explosive substance is placed to provide explosion temperature for length unit of well from 3500 to 1400 kcal/m and filling volume of horizontal wells by explosive substance from 5 to 20% during filling of remaining wells volume by liquid. After explosion, a packer is lowered into cased portion of wells.

EFFECT: higher efficiency.

3 cl, 1 tbl, 1 dwg

FIELD: mining industry.

SUBSTANCE: device has collapsible body of at least two portions. These are held relatively to one another, have a combined axial channel and together form a hermetic ring-shaped hollow. Therein a ring-shaped cumulative charge is placed with pressed explosive substance in metallic case in form of a torus, having outer ring-shaped recess. Opposite to the latter body is made with lesser thickness of outside wall. Body has at least one inner radial channel, connecting ring hollow to axial channel. In this axial channel a means for initiating ring-shaped cumulative charge through radial channel is positioned. Portions of body are mated by ends adjacently to each other and made with possible exclusion of strains from axial loads in zone of outer wall of decreased thickness under well conditions.

EFFECT: higher reliability and efficiency.

3 dwg

FIELD: oil industry.

SUBSTANCE: method includes lower heat energy source and implosion chamber into well. Heat effect is applied and phase-explosive process is launched by opening implosion chamber. Implosion chamber is opened after reaching maximal temperature of well liquid at the very beginning of its decrease. Then phase-explosive process launch temperature is decreased. At second object method includes lower heat energy source and air implosion chamber into well. Heat effect is applied and phase-explosive process is launched by opening air implosion chamber. Air implosion chamber is positioned at distance from heat energy source, where well liquid temperature provides for launch of phase-explosive process, or air implosion chamber is opened with a delay. By these, excessive energetic potential of phase-explosive process is prevented with destruction of casing column and cement stone. Power of phase-explosive process is limited by use of air chamber under pressure.

EFFECT: higher efficiency.

2 cl

FIELD: oil and gas industry.

SUBSTANCE: method includes placement of deep operation body in perforation zone, capable of forming pressure pulses via remote initiation of gas mixture explosions. Depression of bed is performed by lowering liquid level in a well, forming a certain volume of explosive gas mixture in deep body, performing multiple effect on bed without raising of body until well product influx increases. Explosion pressure is set on basis of hydrostatic pressure of well liquid and volume of explosive gas mixture on basis of table provided in description.

EFFECT: higher efficiency.

1 tbl

FIELD: oil-and-gas field development.

SUBSTANCE: method involves forming continuous disc-shaped slot in well by successive blasting gunpowder charges along with increasing power thereof in trinitrotoluol equivalent from explosion set to explosion set as slot length increases and strengthening the slot. The slot is formed so that aperture and radius thereof are related by analytical correlation.

EFFECT: increased ability of oil and gas extraction.

3 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes placing an explosive device in a well in working gas-liquid substance, occupying also the volume of well below perforator and above it at distance 10-300 meters. At upper mark of gas-liquid substance viscous-resilient liquid is placed with height of hydrostatic column 10-50 meters. Above viscous-resilient liquid main volume of gas-liquid substance is placed with relation of gas and liquid therein being less, than in working gas-liquid substance below viscous-resilient liquid. Density of main volume of gas-liquid environment is taken for calculation of forming of necessary depression in well shaft. With that depression, after gathering of structural viscosity by viscous-resilient liquid, explosion is performed.

EFFECT: higher efficiency.

14 cl, 1 ex

FIELD: oil production, particularly methods for stimulating oil production.

SUBSTANCE: method involves performing deep perforation through all intervals of formation to be treated; assembling sectional charge with central channel for tool set passage; lowering charge into well and combusting sections thereof formed of compositions providing charge burning in aqueous, oil-and-water and acid medium to form combustion products; increasing pressure and temperature inside the well; performing control of charge section burning in real time mode during fast combustion thereof; recording behavior characteristics of the charge and estimating the pattern of action exerted on the formation and bottomhole formation zone response to the action. Composite rod formed of material providing rod integrity during mechanical and heat load application during charge lowering/lifting and combustion process is used for charge assemblage. Composite rod has inner channel extending along central axis thereof adapted for passing power lead of ignition unit and wire with heat-resistant insulation connecting borehole cable with electronic unit adapted for controlling and recording behavior characteristics of the charge. Electronic unit is connected with lower part of lower rod and spaced a distance from charge sections. The distance is selected to prevent direct action of charge combustion products on the electronic unit. Besides, gas flow distributor is arranged between lower charge section and electronic unit to provide maximal directed action onto formation to be treated. Inner charge cavity is filled with surfactant for the full structure height to provide additional differential pressure drawdown and mechanical impurities removal as a result of surfactant foaming during charge burning. Perforation is performed through all formation intervals by means of perforator with 30-45° phasing so that vertically inclined spiral cracks around well bore in bottomhole zone are formed after charge combustion. The cracks are restricted from closing during following hydraulic fracturing and provide hydrodynamic communication between well and formation. For charge assemblage upper and lower rods connected to both ends of load-bearing rod part are used, wherein upper rod is lengthen up to 2.0-2.5 m, lower one is extended up to 1.0-1.5 m.

EFFECT: reduced accident risk, decreased thermal impact action on borehole cable, possibility of well normal operation after treatment thereof due to prevention of pump clogging with mechanical impurities and pyrobitumens during well operation starting and increased perfection of reservoir drilling-in.

2 dwg

FIELD: oil production, particularly to stimulate bottomhole zone contaminated with paraffin, asphaltic resinous, salt, sludge and other deposits to increase oil output.

SUBSTANCE: method involves combusting solid fuel charges in well and creating successive excessive pressure pulses of gaseous combustion products. Solid fuel charges are combusted simultaneously with providing periodical stepped change in area and combustion temperature along with performing control of gas entering into well. This provides excessive pressure pulses which occur with frequency corresponding to time fractal processes of fatigue crack propagation in geological bed environment and creates pressure oscillations with 0.5-800 hertz frequency. The pressure oscillations act upon bed matrice material, as well as upon fluids and mud filling it.

EFFECT: increased efficiency due to increased coverage of elastic vibration application, reduced power inputs, creation of favorable conditions for nonreversible crack-propagation process and for providing purposeful triggering action.

24 cl, 4 dwg

FIELD: oil production, particularly to penetrate oil formations characterized by low filtration characteristics.

SUBSTANCE: method involves applying gaseous medium pressure action to formation within productive zone interval, wherein the gaseous medium is obtained from reaction between oxidizing agent and fuel, which are self-ignited once brought into contact. The oxidizing agent is halogen fluoride or derivatives thereof or nitronium perchlorate. The fuel is formation fluid. Contact between the oxidizing agent and the formation fluid is provided by supplying the oxidizing agent into the formation in impulse mode. The oxidizing agent supplying is carried out in shots performed by gun or gas-jet perforator provided with bullet and oxidizing agent or with conical casing and oxidizing agent.

EFFECT: possibility to combine well perforation operation with crack forming (formation breakdown) operation and, as a result, increased ability of formation treatment.

4 cl, 2 tbl, 2 dwg