Device for hydraulic rupture of beds
SUBSTANCE: device comprises geophysical cable, facility of transportation, connected to hydraulic rupture facility. According to invention, transportation facility is arranged in the form of hydraulic propeller connected by common shaft to drive and high-voltage generator, installed inside closed sealed vessel. This vessel is in its turn installed inside jacket with formation of circular gap. At the same time high-voltage generator is arranged with piezoelectric plates.
EFFECT: improved efficiency of hydraulic rupture by increasing efficiency of perforation facility delivery, intended for hydraulic rupture of beds into horizontal or inclined well.
The invention relates to the mining industry, namely to the oil and gas industry.
A device for the delivery of logging tools into the well on a Russian patent for invention №2054539 containing wireline and means of delivery in the form of additional goods, made with the possibility of stringing on the logging cable. At the ends of the sections and clamps are made with locking elements.
The disadvantage is that the total length of all sections of additional cargo must be greater than the horizontal length of the well. For wells having horizontal section of the great length of this device is not applicable due to the large complexity of manual work, great weight and the possibility of breakage of the geophysical cable.
A device for the delivery of logging tools in horizontal wells by RF patent for the invention №2138613, which contains the logging cable and a delivery vehicle in the form of a segment of cable with enhanced stiffness and increased in diameter, installed between the logging cable and a geophysical instrument. This segment of the cable simultaneously performs the role of goods and means of delivery due to the large diameter and high rigidity. In addition, we recommend that you create in mouth high blood pressure 6...7 MPa.
A device for hydrometry is and layers by RF patent No. 2260115, containing sectional pyrotherapy, electronic power supply and a composite rod. This provides a reduction in accident rates, reducing the impact of temperatures on the logging cable, providing output well in normal mode after processing by preventing clogging of the pump mechanical impurities, asphaltenes at the start of the production enhancement reservoir. The inventive method includes deep perforations on all intervals of the processed layer, Assembly, sectional charge with a Central channel through which pass the details of the snap. Down the charge in the hole and burn it section, made of compounds, which provides burning in water, water-oil and acid environment with formation of combustion products. Increase the pressure and temperature in the well. Control of combustion sections of charge in real time with fast combustion processes. Register specifications operation mode of the charge. The nature of changes in these characteristics are judged on the nature of the stimulation and the reaction of the bottom hole zone of influence. For Assembly of the battery using the composite rod made of material so as to maintain integrity when exposed to mechanical and thermal loads during descent-the rise of the charge and its combustion. Composite rod with a hollow channel, passing inside the rod along its Central axis for the passage of wires power supply node ignition and wires with heat-resistant insulation, connecting the wireline to the electronic control unit and reception characteristics of the mode of charge. This unit is attached to the lower part of the lower rod and come from sections of the charge at this distance, so that hot products of combustion of the charge had no direct impact on it. In addition, to reduce the load on the rod and provide maximum directional effect on the treated layer between the lower section of the charge and the electronic unit has a diffuser of a gas stream. The inner cavity of charge to the entire height of the construction fill of the surface-active substance to provide additional depression on the formation and removal of mechanical impurities in the foaming surface-active substances during combustion of the charge. Perforations on all intervals of the processed layer is carried out by the perforator with the phasing 30-45° with the formation of the post-combustion of the charge vertically-inclined spiral fractures around the borehole in the critical zone, which is not closed during subsequent fracturing and provide the hydrodynamic coupling of the well layer. When assembling the charge to save the whole the particular design and reduce the impact of temperatures on the logging cable at the combustion charge use extended up to 2.0-2.5 m in the upper and elongated to 1.0-1.5 m lower rod, attached to both ends of the bearing portion of the rod.
The disadvantage of this device is that the descent of the means of perforations in a horizontal well or a well with a slope of 5...7 deg. very difficult, in addition, close.
The objective of the invention is the provision of delivery means of perforations intended for hydraulic fracturing, horizontal or inclined well and improve the effectiveness of hydraulic fracturing.
The solution of the stated problem is achieved in the device for hydraulic fracturing, containing geophysical cable, means of transportation, coupled with by means of hydraulic fracturing, the fact that the means of transport made in the form of hydraulic thruster connected to a common shaft with a drive and a high voltage generator placed inside a closed sealed enclosure that is installed, in turn, inside the casing, with the formation of the annular gap, with the high-voltage generator is made with piezoelectric plates, and a common shaft has a disk with rollers, the latter of which are able to exert pressure on the piezoelectric plate when the rotation of the common shaft from the drive.
The invention is illustrated in figure 1...13 where:
figure 1 shows a diagram of the delivery means of hydraulic fracturing and high voltage generator in the hole,
the piano is D.2 provides a means of fracturing tool delivery, the first option
figure 3 shows a second variant of the device
figure 4 shows a third variant of the device
figure 5 shows a fourth variant of the device
figure 6 and 7 shows the first variant of the connection means of delivery and means of hydraulic fracturing,
on Fig and 9 show a second variant of the connection means of delivery and means of hydraulic fracturing,
figure 10 shows the design of the generator high-voltage
figure 11 shows a fragment means of hydraulic fracturing,
on Fig shows the design of the roller,
on Fig the design of the compensator pressure and thermal expansion.
The device (1...13) is designed to run in hole 1 means frac 2 and implementation of hydraulic fracturing for enhanced recovery of oil. The device (1) contains surface and downhole equipment. Ground equipment includes remote control 3, the computer 4 monitor 5 connected to the power source 6. With the control unit 3 connected to the logging cable 7 is wound on the spool 8. Logging cable 7 or the coil 8 is in contact roller 9 of the device for measuring the length of the cable 10.
Downhole apparatus includes a tool frac 2 and a delivery vehicle 11 that is installed in a closed sealed housing 12. The device has at one end a cable lug 3, connected to the logging cable 7. Between the pyrotechnic means 2 and the delivery vehicle 11 is made docking station 14 for tight mechanical and electrical connection means frac 2 with the delivery vehicle 11.
The delivery vehicle 11 includes drive 15 (mostly this can be an electric motor) and hydraulic mover 16 in the form of one or two screws 17 and 18. Scheme with two propellers 17 and 18 has the advantage compared with the scheme, with one propeller, as there is no reactive torque causing rotation of the delivery means 11 and to the twisting of the logging cable 7. The screws 17 and 18 can be set either in one plane or aligned.
Tight closed housing 12 is installed on the ribs 19 in the casing 20 with the formation of the annular gap. The casing 20 is made open at both ends and contains before propellers 17 and 18 of the conical inlet part 21 with holes "G". The input end of the tapered part 21 and holes "G" closed filters 22 to prevent contact with propellers 17 and 18 foreign particles of large size, which can lead to blockages. Between the propellers 17 and 18 and the actuator 15 is set conversion mechanism 23 for converting rotation of one drive shaft 15 during the rotation of the two shafts 24 and 25. Inside hermet knogo closed housing 12 is set to a high voltage generator 26.
The fracturing tool 2 (2 and 11) comprises a sealed cylindrical housing 27, in which radially mounted in the insulator electrodes 28 29 connected to the wire 30 from the docking station 14, which, in turn, connected to high voltage wires 31 from the high voltage generator 26 connected to the actuator 15.
Docking station 14 is located between the delivery vehicle 11 and the fracturing tool 2 (Fig 3 and 4). Docking station 14 may include two joined parts 32 and 33 and provides electricity transmission and rotate for 5...10 degrees for the passage section of the well with a radius curvature. The first abutting portion 32 attached to the end of the conical section 21, the second abutting portion 33 attached to the end of the airtight cylindrical body 27 tools frac 2 if the fracturing tool is in front of the delivery vehicle 11 (2, 4).
There are several variants means of delivery 11.
Figure 2 and 4 show the option to install a delivery means 11 after 2 frac 2 (in the direction of movement in the borehole), i.e. a delivery vehicle 11 is made with a pusher propeller screws 17 and 18. Two of the propeller 17 and 18 mounted in the casing 20 and have the possibility of rotation in opposite directions by applying a transformation mechanism 23. As a mechanism for change is adowanie 23 you can use a reducer or multiplier.
The fracturing tool 2 (3-5 and 11) can be installed after delivery means 11 (in the direction of movement to slaughter). In this case, the cable tip 13 is made on the end of cylindrical body 27 tools fracturing 2. The fracturing tool 2 has a cylindrical housing 27, in which the insulators 28 are mounted the electrodes 29 and 30, which are connected to high voltage wires 31 (11). Docking is connecting parts 32 and 33.
The conversion mechanism 23 (Fig.6-7) contains mounted on the control shaft 34 and pinion gear 35. In mesh with the pinion 35 is the first intermediate gear 36, mounted on the first driven shaft 24. The second intermediate gear 37 mounted on the same shaft and is engaged with the driven gear 38 mounted on the shaft 25. This provides the opposite rotation of the propellers 17 and 18 and prevent rotation of the casing 21 and tightening the logging cable 7.
The second variant of the conversion mechanism and hydraulic thruster is shown in Fig and 9. Propellers 17 and 18 mounted coaxially on the driven shafts 24 and 25, are made concentric, while the driven shaft 24 passes inside the driven shaft 25. The most preferred execution of the transfer mechanism is the use of a reducer or multiplier in the form of the epicycle gear IU is anima, for example, the differential planetary gear unit. In this embodiment, the conversion mechanism 23 includes (Fig) mounted on the control shaft 34 of the Central wheel 39, the sun wheel 40 and satellites 41, mounted on the drive rod 42.
The high-voltage generator 26 (figure 10) installed in a common housing and includes a protective housing 43, the rotor 44. Protective housing 43 has a rear (lower) part of the electrical connector 45 is connected to the inner wire 46 from a device to convert mechanical energy into electrical energy 47. Device for converting mechanical energy into electrical energy 8 includes a piezoelectric plate 48 and at least one deformation mechanism 49, the number of which corresponds to the number of the piezoelectric plates 48 connected through a common shaft 50 by the actuator 15.
Each deformation mechanism 49 is made in the form of a disk 51 mounted on a common shaft 50 and having both sides mounted on the axis (axes) 52 rollers 53. The rollers 53 mounted on the axis 52 with a radial clearance δ (Fig) and moved within this gap under the action of atropine forces R. Between the rollers 53 and piezoelectric plates 48 are installed flexible insulating strip 54 (figure 10). The common shaft 50 mounted in bearings 55 and 56. The bearings 55 and 56 are sealed by seals 57 and 58 closed or completed. All detail the high-voltage generator 26 is installed in the cavity 59, which is airtight and filled with inert gas. The actuator 15, the high-voltage generator 26 and the conversion mechanism 23 can be equipped with a common unit of pressure compensation and temperature expansion 60 (Fig)t or each his own. Housing 1 has holes 61 for the high-voltage wires 46. The design of the compensator pressure and thermal expansion 60 shown in Fig, it contains the piston 62, the cavity 63 under the piston 62 hole 64 is connected to the cavity 63 and the cavity 65 above the piston 62 is connected by the bore 66 with the environment. The piston 62 is biased by spring 67.
The operation of the device (1...13).
In the well 1 drop on the logging cable 7 pyrotechnic device 2 and the delivery device 11, United docking station 14. Vertical part of the well 1, the device is held under the action of gravity, while logging cable 7 is unwound from the reel 8 and the sensor cable length 10 determines the depth to which lowered the device, and passes this information to the computer 4. In the horizontal section of the well or on land having a slope less than 5...7 degrees, move the device without extraneous forces is impossible. So from the control panel 3 includes a power supply through logging cable 7 to the actuator 15, which spins the propellers 17 and 18 Hydra is symbolic of the propulsion unit 16. Propellers 17 and 18 rotate in opposite directions by applying a transformation mechanism 23. Due to counter-rotating propellers 17 and 18, the casing 20 is not operating torque, and it is not rotating, and the logging cable 7 is not twisted.
The flush fluid propellers 17 and 18 is discarded through the annular clearance In the direction opposite to the slaughter. This creates a reactive force that moves the delivery vehicle 11 forward, it, in turn, moves the pyrotechnic means 2. Information about the location of the device in the borehole is determined by the device for measuring the length of the cable 10 and is passed through logging cable 7 to the computer 4 and the monitor 5. When the desired depth is the signal transmitted from the remote control 3 through logging cable 7 further through the cable lug 13 on the high voltage wires 31 to the electrodes 29 and 30, between which passes the spark.
Power high voltage electrode 29 is provided a high voltage generator 26. The high-voltage generator 26 is driven in rotation by the actuator 15 through the common shaft 50 which rotates with the rotor 44. During the rotation of the common shaft 50 causes the rotation of the disk 51 with the axes 52 and rollers 53. The rollers 53 are putting pressure on the piezoelectric plate 48 (Fig) due to centrifugal forces R, in which there is a high voltage, which the inner wire 46 is transmitted to the electrical connector 45 and then to the high-voltage wires 30 and 31 to the electrodes 29, between which there is a discharge that causes water hammer in the borehole 1 and hydraulic fracturing.
The compensator pressure and thermal expansion of 60 (figure 10 and 13) compensates for the change in the flow rate of lubricant in the cavity 59 for any reason: leakage, changes in pressure or temperature.
Management of all processes performed by the computer 4.
Application of the proposed technical solutions allowed:
1. to ensure the delivery means of perforated seams in horizontal section of the well to a certain depth and high voltage electrical discharges;
2. to ensure the safety of personnel through the application of the high voltage source at a considerable depth in the pit and control them using a computer having a small voltage on ports;
3. to prevent twisting of the geophysical cable and rotation of the pyrotechnic device through the use of two propellers rotating in the opposite direction.
Device for hydraulic fracturing, containing geophysical cable, means of transportation, coupled with by means of hydraulic fracturing, characterized in that the means of transport made in the ideal hydraulic thruster, connected to a common shaft with a drive and a high voltage generator placed inside a closed sealed enclosure that is installed, in turn, inside the casing with the formation of the annular gap, with the high-voltage generator is made with piezoelectric plates, and a common shaft has a disk with rollers, the latter of which are able to exert pressure on the piezoelectric plate when the rotation of the common shaft of the actuator.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil industry and can be applied in dual operation of two beds in the same well. The unit comprises a power drive, a driving element, a packer and fluid lifting lines with parallel tubing string columns lowered in the well. The unit accommodates a parallel anchor with apertures for cables and tubing string columns, eccentric guides fixed by centering clips on auxiliary branch built in the long tubing string column, bottomhole apparatuses connected to cables and arranged above and below the packer. Each guide has apertures for the cables and an aperture with the top deepened inside in the form of a funnel for the short tubing string column.
EFFECT: invention ensures coupling of the short tubing string column with the parallel anchor and prevents damage of cables.
FIELD: oil and gas production.
SUBSTANCE: downhole equipment centraliser comprising a hollow rod with a socket end, a coupling, a cylinder, a piston pusher and rams partially radially movable forward when travelling along the tapered case. Besides the coupling is provided from beneath; from the top, the hollow rod is equipped with a landing seat, and the cylinder wherein all the movable elements are provided, comprises ram windows and seats between the coupling and the landing seat while being designed to rotate and join a centre tube of the hollow rod; the tapered case is rigidly connected with the piston pusher spring-assisted from beneath to travel longitudinally downwards and rotate about the hollow rod.
EFFECT: rigid and reliable centering of the downhole equipment in the required interval.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil producing industry and is designed for generating pressure pulses in drilling agent in drill string and for measurements during drilling. For this purpose the bell of the pulse generator travels up and down to shift drilling agent from pressure reservoir into a chamber of sliding pressure and out of it and along corresponding upper and lower connecting channels. The bell is actuated by means of certain sequence of manipulations performed with solenoids with a bidirectional disk valve. The circular channel of the pulse generator is designed to decrease turbulence of drilling agent flow and to generate practically laminar flow in a pulsation region. A pulse or absence of a pulse is converted into a digit signal transmitted to surface with a pressure sensor implementing algorithm of decoding. Further a signal is visualised by a drill foreman and operators who obtain valid data about direction and geologic formation; these data assist an operator in determining direction of drilling. Additional pulse generators increasing rate of data transmitting can be introduced in the given instrument. Raised velocity of data transmitting facilitates obtaining more thorough information, decreases drilling expenditures and increases yield of oil deposit.
EFFECT: raised information value and reliability of methods and facilities due to insensitivity of facility to flow velocity and pressure; skipping over adjustment during operation; forming recognisable, repeated, reproducible and pure signals of pressure pulses at minimal consumption of power.
37 cl, 4 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: telemetric system sound bottom support includes a bottom sub, an electric module protected jacket and a centraliser. At that the centraliser executed as two co-axial elements with radial connections in between. The centralisers internal element is elongated in comparison with an external one, and in the centralisers internal element top part executed a blind hole along its axis, where an elastic element installed, made of non-magnetic material. The elastic element made of titanium or non-magnetic steel, or bronze, or metal rubber, or rubber.
EFFECT: sound bottom support parts lifetime increase, assembly simplification and its reliability increase, the support spare parts and its assembling work content decrease.
4 cl, 1 dwg
FIELD: metering equipment.
SUBSTANCE: invention is related to survey of underground formations with application of acoustic measurements performed in well. For this purpose body of acoustic logging tool is made as configured for isolation of receiving elements and electronics in acoustic receiver unit against well environment. At the same time body has an interrupted, alternating structure, which acoustically non-transparent in some zones and acoustically transparent in the others. Body may be modular, with several steps joined one to another. Multiple steps provide for the body that may be used with multiple well logging tools for reduction or elimination of noise transfer to receiving elements.
EFFECT: improved efficiency of survey by elimination of interfering signals and provision of adequate mechanical strength of acoustic logging tool.
47 cl, 9 dwg
FIELD: oil and gas production.
SUBSTANCE: invention refers to oil industry and can be implemented at survey of wells. The method of evaluation of static and dynamic levels of fluid in annular space of a well equipped with an electric centrifugal pump includes evaluating of levels by geo-physic methods. Prior to evaluation of levels a hole is made in a face plate. A perforated plastic pipe narrowed in its lower part and secured on external surface of a flow string is lowered together with the flow string and the pump into the well. Bottom of the plastic pipe is arranged 0.5-1.0 m above the pump; an upper end of the plastic pipe comes out to surface through the hole in the face plate. A gap between the plastic pipe and the hole of the face plate is leak proofed; a measuring tape with a level sensor is lowered inside the plastic pipe. Surface of fluid is contacted; a level is measured and the measuring tape is withdrawn out of the plastic pipe.
EFFECT: simplification of measuring procedure of fluid level.
SUBSTANCE: invention relates to mining and is provided predominately for subsurface video surveillance, particularly for implementation of visual verification and automated flaw detection of condition of boreholes. Device for video surveillance of well includes sealed outboard unit with video camera and hermetic enclosure, which contains lamp, unit of secondary current supply, remote sensing unit, unit of input and sealing of hoist cable and electric signals converter. Additionally outboard unit additionally contains radiator, linked to environment, heat-conducting container, into which it is placed video camera and coolant, based on the Peltier effect.
EFFECT: providing the ability of video surveillance of boreholes in conditions of elevated temperature.
2 cl, 1 dwg
FIELD: oil industry.
SUBSTANCE: system consists of upper cable plug (UCP) and lower cable plug (LCP) and a body. At that, UCP is provided with cable cords (CC) uniformly located in a circumferential direction and covered with an insulation material, and plugs without being insulated are installed on CC ends. Body is provided with CC uniformly located therein in a circumferential direction, on top ends of which there installed without insulation and located in the body cavity are tips, and with a gasket with holes for CC. At that, LCP is provided with CC covered with insulation material and uniformly located in a circumferential direction and with a flange wherein two holes for mounting elements are made. In UCP and LCP body insulators with holes for CC are located. Seal rings are located in the joints between UCP and the body along the mating cylindrical surfaces. Body and LCP are provided with seal rings located on their external surface, and UCP is provided with a flange with two holes for mounting elements. Body is made in the form of a shell inside which insulators are located with CC uniformly located in a circumferential direction and equipped with limit stops preventing their axial movement. At the shell bottom there made are holes for CC covered with insulation material for LCP and coaxial relative to CC located in the body. Upper part of the shell is made in the form of a hollow cylindrical sleeve coming out of the flange provided with two holes for attaching the mounting elements and coaxial relative to the holes made on UCP flange. Gasket is located in the upper part of the body and locks insulators, and its holes are made for CC covered with insulation material for UCP and are coaxial relative to CC located in the body, on lower ends of which the tips are installed without insulation. Plugs without LCP insulation are installed on CC ends. Tips are collet-type and are provided with spring rings. All joints of tips and plugs with CC ends are threaded.
EFFECT: providing reliability and efficiency of the system for connecting the submersible electric motor to the power cable on the well's top, protected against action of the well's corrosive medium and delivered to the site with maximum availability.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to geo-physical surveys of wells and can be implemented at assembly of well apparatus of telemetry system. The unit consists of an internal threaded bushing and of thrust half-rings. The unit also contains a nut-fairing and a profiled bushing with a flange; on the end of the profiled bushing there are made lugs, while response slots are made on the internal threaded bushing. Also one of the lugs of the profiled bushing is thickened in radial direction, while a module, whereon bushings are assembled, has a slot and a circular groove for the thickened lug; an orienting slot is cut on the flange of the profiled bushing; the response lug entering the orienting slot is made on the end of the second module.
EFFECT: upgraded reliability of assembly modules of telemetric system and improvement of its consumer characteristics.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil industry and can be implemented at operation of oil wells, where depth electric centrifugal pumps are used as cable inlet of high pressure. To achieve the said, the cable inlet is equipped with two sealing packages. One of the packages consists of a complex back-up plate, of a solid cone seal and of a complex packing washer. The second sealing package consists of a complex back-up plate, of a solid cylinder seal and of a complex packing washer. The cable entry with double sealing package is equipped with two bearings installed on each sealing package. A case is equipped with two channels for pressurisation of the cable inlet with double sealing package; the channels are located between sealing packages and are equipped with two plugs installed in these channels.
EFFECT: facilitating control over pressure tightness of cable inlet during operation, simplified installation of cable inlet, also possibility to use cable inlet for existing well stock.
SUBSTANCE: method to determine geometry of crack in underground formations provides for the following: propping agent or working fluid are placed in crack of formation, which contain radiation-sensitive material, containing powder, including vanadium, having particles with size of approximately 1-15 mcm, specified material is non-radioactive until it is exposed to bombardment with neutrons during single logging stage; material is radiated with neutrons after its placement into formation crack; gamma radiation it releases is measured, to produce peak radiation, which it radiates; background radiation is measured during single logging stage, then background radiation is subtracted from specified radiation of peak energy; and crack height in formation is determined by difference between background radiation and radiation of peak energy. Propping agent, including base and coating, where base or coating contain above specified material. Working fluid containing above-specified propping agent.
EFFECT: improved efficiency and environmental safety.
19 cl, 1 tbl, 1 ex, 3 dwg
FIELD: oil and gas production.
SUBSTANCE: procedure consists in filling chamber with material of supply in first position, in essence isolated from flow of high pressure and in displacement of chamber from first position into second position open to flow of high pressure at essential shut-off of supply. Also, the chamber stays under pressure for its more active filling with material and for synchronous filling in accordance with its displacement from the first position into the second position.
EFFECT: raised efficiency of procedure and reliability of systems operation.
25 cl, 8 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to processing methods of underground formations for increasing the production of hydrocarbon from the well. Processing method of underground formation penetrated with the well shaft includes the following stages: mixing of disperse material and liquid-carrier for obtaining the working fluid; introduction of working fluid to underground formation through the well shaft for deposition of disperse material in underground formation; mixing of disperse material and active substance for obtaining at least partially coated disperse material where active substance includes fluorinated hydrocarbon.
EFFECT: improving removal of fluid for hydraulic fracturing from formation and propping agent block.
FIELD: oil and gas production.
SUBSTANCE: method includes the following stages: a) formation of plug from sealing material of solid particles in casing string in well bore, besides plug closes at least one perforation channel in casing string; b) formation of plug from the first packing material of solid particles at least in one perforation channel arranged over the plug in casing string; c) removal of at least upper section of plug, in order to open at least one perforation channel in casing string, which was previously closed by at least upper section of plug; and (d) formation of packing from the second packing material of solid particles, at least in one perforation channel, open as a result of removal of at least upper section of plug, besides the second packing material of solid particles may be identical with the first packing material of solid particles or different from it.
EFFECT: increased efficiency of method.
24 cl, 10 dwg
SUBSTANCE: methods for hydraulic fracturing of subsurface include the first stage, in process of which hydraulic fracturing fluid, which contains thickener, is pumped into well bore to make a crack in subsurface, the second stage, in process of which proppant is added into pumped hydraulic fracturing fluid to prevent crack closure, additionally agents are added into hydraulic fracturing fluid to form proppant clusters or to increase strength of proppant clusters, or to improve transporting capacity of hydraulic fracturing fluid.
EFFECT: formation of crack with high conductivity for reservoir fluid as a result of making strong proppant clusters that prevent crack closure, and channels providing for free flow of reservoir fluids.
67 cl, 4 dwg
FIELD: oil and gas industry.
SUBSTANCE: well compression impulse generator includes housing with ignition initiation system, in which charge system is located. Housing of charge system represents thin-wall strip cover divided into sections with plastic bushes with central holes filled with material-retarder. At that, material-retarder includes mixture of black powder with particle size of 100 mcm with addition of 6% of nitromethane and 3% of aluminium powder.
EFFECT: providing action on well without damage to its integrity and seals of formation rock.
4 cl, 7 dwg
FIELD: oil and gas industry.
SUBSTANCE: method at which there determined is stress tensor in formation, and which involves start of perforation charge to well shaft for perforation of formation and execution at lest of one selection stages of perforation charge and orientation of perforation charge in well shaft on the basis at least partially of determination of stress tensor. Systems used in well shaft, containing perforator intended for being lowered to well in well shaft for perforation of formation enveloping the well shaft, and perforation charge. Perforation charge is located in perforator and oriented relative to well shaft on the basis of determining the damage zone of formation near well shaft, which changes relative to well shaft. At that, determination of confirmed zone is based at least partially on determination of stress tensor.
EFFECT: improving interaction between reservoir and well shaft.
31 cl, 8 dwg
SUBSTANCE: method for stabilisation of subsurface part, in which part of subsurface is put in contact with preflush fluid, part of subsurface is put in contact with strengthening fluid, containing resin and water decomposable dissolvent, and after-flushing fluid. Method for reduction of loose material formation from subsurface part, in which part of subsurface is put in contact with preflush fluid, strengthening fluid, containing resin and water decomposable dissolvent, and after-flushing fluid. Method for rupture of subsurface part with control of loose material formation, in which part of subsurface is put in contact with preflush fluid, strengthening fluid, containing resin and water decomposable dissolvent, with fluid for pressure rupture sufficient to develop or grip the fracture in subsurface part.
EFFECT: increased strength of fixation, no loss of permeability.
34 cl, 1 ex, 1 tbl
SUBSTANCE: method includes pumping of hydraulic rupture liquid, containing proppant particles, through well into crack developed in underground bed. According to invention, in process of pumping turbulent mode of fluid flowing is provided in crack by means of hydraulic rupture pumping with viscosity of less than 0.01 Pa·s with pumping speed of at least 8 m3/min. At the same time hydraulic rupture fluid contains particles of proppant, radius of which is determined by analytical expression in case when proppant particles are heavier than fluid, or by other analytical expression in case if proppant particles are lighter than fluid.
EFFECT: increased conductivity of crack after its closure due to prevention of transverse migration of proppant particles inside crack and reduction of their settling speed.
FIELD: oil and gas production.
SUBSTANCE: invention can be implemented at development of oil deposits, particularly at deposits with producers of low collecting filtration and capacitance properties by means of hydraulic breakdown of formation - HBF. The procedure consists in drilling two horizontal bores from a vertical borehole, in their perforation, and in pumping breakdown fluid and a sand carrier into both horizontal bores. According to the invention horizontal bores are arranged parallel in one vertical plane or horizontal bores can be unparallel with an angle between them. Projection of an upper horizontal bore of the well onto horizontal plane passes through axis of a lower horizontal bore of the well perpendicular to axis of a vertical bore of the well. Further, a casing string is lowered into each horizontal bore; annular space between the casing string and rock is cemented in both horizontal bores of the well. The horizontal bores of the well are perforated by means of a slit perforator per one round-trip operation in each horizontal bore of the well directed azimuthally in a direction from one horizontal bore to another in one vertical plane. This plane passes parallel to axis of the vertical well and perpendicular to axis of the lower horizontal bore of the well. Fluid of hydraulic breakdown and sand carrier are thereafter pumped into each horizontal bore. Opening-out working fluid on hydrocarbon base is used for hydraulic-mechanical slit perforation.
EFFECT: raised efficiency of directional HBF and minimised amount of round-trip operations at secondary formation opening-out before HBF.
3 cl, 3 dwg
SUBSTANCE: invention relates to manufacture of molded ceramic materials for use as propping agent in production of liquid and gaseous fluids from bored wells. Method comprises briquetting and heat treatment of aluminosilicates kaolin at 1150-1250оС. Resulting mix is ground to average grain size 3-5 μm and loaded into granulator. Before granulation, 1.2-3.0% mineralizer and 5-10% plasticizer are added. Mix is moistened with dozed amount of organic binder and stirred to form granules. At the end of granulation, fired ground material for powdering granules is added in amount 1.2-3.0%. Granules are dried and screened to isolate desired fraction, which is subjected to final firing at 1370-1450оС for 30-60 min and then re-screened into commercial fractions.
EFFECT: enabled manufacture of granules having low loose density and high strength allowing their use at depths up to 14000 feet (4200 m).
3 cl, 1 dwg, 1 tbl, 3 ex