Induction heater

FIELD: oil and gas industry, particularly to stimulate oil and gas production by disintegration of asphalt-tar, hydrate-paraffin and ice deposits in oil and gas wells.

SUBSTANCE: heater comprises case and load-bearing member. Serially connected induction coils provided with ferrite magnetic core are serially arranged on the load-bearing member. Load-bearing member is made as conducting non-magnetic rod. Exit loop of the last winding of lower coil is connected to lower part of load-bearing member. Upper case part is made of non-magnetic and non-conducting material. Lower case part is created of magnetic and conducting material. Coils are wound on ferrite magnetic cores having different diameters. Upper coil windings are wound on ferrite magnetic core having larger diameter. Lower coil windings are wound on ferrite magnetic core having lesser diameter.

EFFECT: increased efficiency and rate of action applied to deposits, as well as increased heater capability.

1 dwg

 

The invention relates to the oil and gas industry, in particular to techniques for enhanced recovery of oil and gas by destroying wax, hydrate-paraffin and frozen sediments (Angelo) in oil and gas wells.

Known induction heater, comprising a housing, which is the pump-compressor pipe (tubing), a heating element in the form of a three-wire two-layer coil, which is wound on the outer surface of the housing (patent of the Russian Federation 2198284, CL E 21 In 36/04, E 21 In 43/24, 2001).

The disadvantage of this device is the low efficiency, since the stationary heater is installed on the tubing and produces heating of the liquid flowing only on the section of tubing that does not allow you to destroy or prevent the formation of Angelo on extended sections of tubing.

Known induction heater comprising a casing, a supporting member to host the induction coils. The bearing element is designed as housing, concentric with the established relative to the casing and forming with it a ring cavity in the housing cavity has a core made hollow, with an induction coil is mounted relative to the casing with a clearance, and the cavity of the core is connected with the annular cavity between the casing and the casing (RF patent 2010954, CL E 21 In 43/24, 1994).

The disadvantage is asanoha heater is that it is used in a static position, that greatly reduces its effectiveness and functionality when it is used.

The closest analogue to the proposed device is a downhole induction heater comprising a casing, a supporting member to host an induction coil, a supporting member made in the form of a rod, which is placed coaxially in the casing, an induction coil provided with a ferrite core, the core and the casing is made of non-magnetic and elektroprovodyashchego material, an induction coil connected in series (RF patent 2200228, CL E 21 In 36/04, 37/00, 2001).

The disadvantage of this device is the low efficiency in the destruction of Angelo, since heat is transmitted only through the walls of the tubing and the heated region Ashpile, which significantly reduces the efficiency of the treatment wells, and the elimination of the so-called "deaf jams impossible.

The objective of the invention is to provide an induction heater, which is devoid of these shortcomings, with minimum heat loss, reliable and safe, having a heating portion directly contacting with Angelo and the inductor acting on the wall of the tubing to heat up.

This objective is achieved in that the induction heater containing casing, a supporting member located coaxially with the casing with the size of the seal on it series-connected induction coils equipped with ferrite cores, in addition, a supporting member made in the form of a conductive non-magnetic rod, the bottom of which is closed opening round of the last winding of the lower coil of the induction heater. The upper part of the bearing member through the connector snaps to the armored shell logging cable, the first winding of the upper coil is connected through a connector to the Central conductor of the cable (CFA's). The upper part of the casing made of non-magnetic and elektroprovodyashchego material, the lower part of the casing made of a magnetic and electrically conductive material, with the windings of the coils wound on ferrite cores with different diameters, and the upper winding coil wound on a ferrite magnetic core with a large diameter, and the lower winding coil wound on a ferrite magnetic core with a smaller diameter.

The drawing shows a longitudinal section of an induction heater.

The induction heater includes a casing 1, a supporting member 2. On the host element placed sequentially connected induction coils 3, 4, equipped with ferrite cores 5, 6, a supporting member 2 is made in the form of a conductive non-magnetic rod. On the lower part of the bearing member 2 closes opening round of the last winding of the lower coil 4. The upper part of the N. the existence of the element 2 through the connector 7 is closed on the armour shell 8 geophysical cable 9. The first upper coil winding 3 is connected through the connector 7 to the Central conductor of the cable 10 (CFA's). The upper part of the casing 1 is made of non-magnetic and elektroprovodyashchego material 11. The lower part of the casing made of a magnetic and electrically conductive material 12. Winding coils 3, 4 are wound on ferrite cores 5, 6 with different diameters, and the upper winding of the coil 3 wound on a ferrite magnetic core 5 with a larger diameter, and the lower winding of the coil 4 is wound on a ferrite magnetic core 6 with a smaller diameter.

Induction heater operates as follows.

Connected to a source of high frequency energy through the logging cable 9 induction heater is lowered into the well. When passing high frequency current through windings of the coil 3 generates an electromagnetic field which induces in a dedicated section of tubing eddy currents cause heating of the metal pipe. The flow of high frequency current through the coil 4 is heated by the eddy currents lower part 12 of the casing of the heater. Intense heat at the bottom of the heater promotes rapid and efficient heating and destruction of Ashpile. In the process, the induction heater falls below the heating and destroying Angelo on the depth of their formation.

COI is whether the proposed induction heater will significantly increase the impact on Ashpile with a view to their destruction, and will significantly increase the speed of the impact. This results in a high coefficient of actions proposed induction heater.

Induction heater containing casing, a supporting member located coaxially with the casing to host series-connected induction coils supplied ferrite cores, characterized in that the carrier element is designed in the form of a conductive non-magnetic rod, the bottom of which is closed opening round of the last winding of the lower coil of the induction heater, the upper part of the bearing member through the connector is closed on armored shell logging cable, the first winding of the upper coil is connected through a connector to the Central conductor of the cable (CFA's), the upper part of the casing made of non-magnetic and elektroprovodyashchego material, the lower part of the casing made of a magnetic and electrically conductive material while winding coils wound on ferrite cores with different diameters, and the upper winding coil wound on a ferrite magnetic core with a large diameter, and the lower winding coil wound on a ferrite magnetic core with a smaller diameter.



 

Same patents:

FIELD: oil production industry, particularly to treat bottomhole formation zone and injection wells, which are converted from producing wells.

SUBSTANCE: method involves injecting solvent composition mixed with surfactant in formation; forcing composition in formation; performing time delay and putting well in operation. Before the composition forcing in formation the composition is held at face within the limits of well filter location for 1-2 hours in dependence of filter contamination with asphalt-tar-paraffin deposits or activating technical means usage. The solvent is distillation residue obtained during ethylbenzene and A or B grade styrene rectification. The surfactant is grade B liquid sulphanole taken in amount of 1-10% by the distillation residue weight.

EFFECT: increased efficiency, reduced time and material consumption for bottomhole formation zone treatment.

FIELD: oil and gas industry, particularly to develop wells contaminated with sand.

SUBSTANCE: device comprises hollow two-sectional body. The first body section is made as hydraulic cylinder with inlet channel and suction valve arranged downstream of the inlet channel in the first section. The first section also comprises hollow piston with pressure valve installed inside the first section and hollow piston part. Hollow rod is fixedly secured to hollow piston and may slide in axial direction relatively outlet part of the first section within piston stroke length. The second section has outlet liquid circulation channels and comprises the second part of hollow rod arranged in the second section. Above part is fixedly connected to inlet part of the second section so that the part and inner surface of the inlet part formed in the second section define annular cavity for mud accumulation. Outlet part of the section body section may be connected with means, which lowers device in well.

EFFECT: increased speed of well cleaning due to reduced time losses.

12 cl, 1 dwg

FIELD: oil production industry, particularly increased efficiency of well treatment due to fuller removal of paraffin-tar and asphalt deposits with sandy-argillaceous impurities and improved well bottom zone pore and channel cleaning of the deposits.

SUBSTANCE: method involves delivering device including air chamber with atmospheric pressure and receiving chamber to well bottom, wherein the device is connected to wireline and the receiving chamber is formed of alternating layers made of two types of hard composition materials, namely of the first hard composition material, which evolves small amount of gas during combustion and the second hard composition material, which evolves large amount of gas during combustion; combusting receiving chamber in layers to generate compressed hot gaseous combustion products within treatment interval and to provide hot combustion gas penetration in reservoir pores and channels to melt deposits present therein. Before combustible diaphragm activation cyclic wave hot gas action is applied to reservoir with amplitude of not less than 2 MPa and at repetition frequency of not less than 5 cycles per 1 minute.

EFFECT: improved efficiency of well bottom treatment characterized by sandy-argillaceous impurities.

1 ex

FIELD: oil output stimulation, particularly pulsed productive bed and well screen treatment.

SUBSTANCE: vibratory device comprises cavitational liquid pressure oscillation generator made as Venturi tube. The Venturi tube has diffuser with cone angle exceeding 15°, inlet nozzle and transition section connecting the diffuser with the inlet nozzle. Generator also comprises barrel having inner channel. Inner channel diameter is not less than 4 inlet nozzle diameters. Transition section between Venturi tube and inlet nozzle has radius of not greater than 200 μm.

EFFECT: increased reliability and efficiency of vibro-wave productive bed and well screen treatment during recovery thereof.

2 cl, 2 dwg

FIELD: methods for stimulating production, particularly pulsed productive bed and screen treatment.

SUBSTANCE: method involves applying hydraulic pulsed vibro-wave liquid flow action to screen and well bore zone of productive bed; determining static liquid level in well and recording dynamic liquid level change. Amount of liquid injected for productive bed and screen treatment does not exceed well yield set during well development. Well treatment is finished as dynamic liquid level approaches static level and as dynamic level reaches minimal value.

EFFECT: increased reliability and efficiency.

1 cl, 1 dwg

FIELD: oil industry, particularly devices to operate wells complicated with powder material precipitations on well face and in bottomhole formation zone.

SUBSTANCE: device comprises serially arranged flow string, discharge valve, accumulation container and cylinder with piston, as well as check valve and liner. The device also has pushing tube having upper part located in the cylinder so that the tube may cooperate with the piston, and lower part connected to the liner. Accumulation vessel is connected with the cylinder. In initial state the piston is fixed in the cylinder by means of fastening members, which may be sheared under the action of flow string. Pusher tube travel limiter is installed in the cylinder.

EFFECT: increased efficiency of precipitation removal.

2 cl, 1 dwg

FIELD: oil industry, particularly equipment for paraffin removal from oil production wells provided with sucker-rod borehole pumps in different climatic zones.

SUBSTANCE: heating method for oil production well provided with sucker-rod borehole pump installed inside flow string, wherein sucker rods of borehole pump are hollow and are joined with each other in air-tight manner involves arranging flexible insulated heating cable inside hollow sucker rods; uniformly heating produced fluid over a distance from well head to lower end of flexible insulated heating cable up to temperature 2-60° exceeding temperature of paraffin melting in produced fluid, wherein produced liquid heating is carried out directly through hollow sucker rod string during reciprocation thereof inside flow string. Well heating device comprises flexible insulated heating cable and power source. Flexible insulated heating cable is connected to power source through heating control station. The flexible insulated heating cable is arranged in sucker rod string of sucker-rod borehole pump with outer diameter of 12-74 mm. Hollow sucker rods may reciprocate inside flow string. Sucker-rod borehole pump has drive to provide sucker rod string reciprocation inside flow string. The pump also comprises body, plunger piston and central hollow shaft. Lower hollow shaft part is connected with plunger piston. Upper hollow shaft part is attached to hollow sucker rod string through hollow sub. Lower end of flexible insulated heating cable is arranged inside central hollow shaft. The body is rigidly secured inside flow string. Plunger piston is connected with lower hollow sucker rod string end through solid shaft. In accordance to another embodiment sucker-rod borehole pump has drive to provide sucker rod string reciprocation inside flow string, body, plunger piston, central hollow shaft and suction and pressure valves. The body is rigidly secured inside flow string. Plunger piston is connected with lower hollow sucker rod string end through solid shaft. Plunger is secured to lower hollow shaft part, upper hollow shaft part is provided with sub, which connects hollow shaft with hollow sucker rod string. Hollow shaft extension is connected to lower hollow shaft part. Fastened to hollow shaft extension through hollow sub is additional part of hollow shaft string.

EFFECT: increased efficiency of oil production well heating, prevention of paraffin deposit on walls of wells having outputs typical of above well kind.

13 cl, 6 dwg

FIELD: oil industry, particularly to stimulate or resume oil and gas well operation by performing thermal-chemical treating and cleaning of well bottom zone to remove deposits, namely asphalt-tar and paraffin deposits.

SUBSTANCE: method involves lowering flow string in well interval to be treated via casing pipe; supplying heat-generating substances; creating increased pressure; treating bottomhole formation zone; performing technological time delay and applying depression action to heated zone to be treated. Lower part of flow string is provided with uncontrollable plug valve, which is pinned to flow string and defines sealed cavity along with flow string interior. As flow string is lowered in well hydrogen peroxide is supplied in flow string. Then hydrogen peroxide-neutral acetate buffer solution is fed and the buffer solution is isolated from hydrogen peroxide with uncontrollable plug valve. 5% manganese solution and water are supplied in well. Acetate buffer solution has density exceeding that of manganese solution. Manganese solution density exceeds water density. After flow string lowering in well backpressure is created in well interval to be treated by filling space between casing pipe and flow string with water. Then pressure is increased in flow string. Once pressure jumps water is supplied via flow string in well interval to be treated. After technological time delay execution bottomhole formation zone is subjected to depression action by flushing thereof with aerated acetate buffer solution.

EFFECT: increased efficiency of well bottom zone treatment.

1 dwg

FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves selecting well characterized by reduced intake capacity for following well treatment so that total outflow time is to be not more than 5 hours; bringing the selected well into operation for not less than 10 days along with liquid injection via the well; providing maximal conditional passage of well fittings; stopping liquid injection in well; discharging liquid from well to reach necessary calculated liquid volume at maximal flow rate; injecting liquid through the well at flow rate equal to 3 initial well intake capacity values up to pressure stabilization; injecting liquid in well at increased flow rate equal to 4 initial well intake capacity values; performing flow rate increase in several stages under stabilized injection pressure, wherein each flow rate increase step is equal to initial well intake capacity value, up to full control valve opening; discharging liquid from well at maximal flow rate so that discharged liquid volume is equal to calculated one; repeating liquid injection and discharge operations 3 times, wherein the last liquid discharge operation is carried out at maximal flow rate and in amount equal to the volume of the first liquid discharge.

EFFECT: increased well cleaning efficiency.

1 ex

FIELD: well operation and maintenance, particularly to clean well of mud, as well of sandy and sludge deposits.

SUBSTANCE: device comprises body with radial windows and upper packer. Hollow rod with perforated orifices is concentrically arranged in the body so that the rod may perform limited axial displacement in downward direction. Shank is fixedly secured to lower body part. The shank may cooperate with sandy and sludge deposits present in well. Upper hollow rod part is connected with flow string. Packer is made as self-sealing sleeve and permit liquid passage in down-top direction. Upper body edge has projections. Cylindrical extension is created on inner body surface below radial windows. Perforated orifices of hollow rod are made as two rows of lower and upper perforated orifices. The hollow rod is provided with groove located over upper perforated radial orifices. The groove includes radial and axial parts connected one to another. In initial position lower perforated orifices of hollow rod are closed with cylindrical extension of the body. In initial position upper perforated orifices of hollow rod are closed with bush fixed relatively hollow rod with finger installed in radial groove part in initial position. Bush is provided with check valve located inside bush and made as valve cage and ball arranged in the cage. Cylindrical extension with through orifices is made in lower bush part. Lower edge of cylindrical bush extension is provided with depressions cooperating with body projections during lower perforated orifices opening. Hollow rod has sealing member arranged on rod outside between lower and upper perforated orifices over the body. The sealing member isolates body interior during lower perforated orifices opening.

EFFECT: increased well cleaning efficiency and guaranteed further well flushing in one trip.

2 dwg

FIELD: mining, particularly to perform heat treatment of highly-viscous oil reservoir, to recover hydraulic communication between reservoir and well and to repeatedly operate noncommercial producers for oil, natural gas, fresh, mineral or thermal water production.

SUBSTANCE: device comprises heater body, power supply cord connected to central tubular current conductor, perforated disc electrodes installed on central current conductor and isolated from heated body filled with current-conductive fluid, water supply system, tubing string connected to water supply pipe, to pump having adjustable drive and to water vessel. The water supply system includes valves and orifices made in additional body coaxial with heater body. The device also has heat-resistance packer installed over additional body and voltage regulator. The device is provided with distribution means arranged below tubing string. Inner distribution means cavity is filled with dielectric liquid. Connection unit, which joints tubing string with dielectric insert and with adapter having orifice coaxial to tubular insert orifice, is axially aligned with distribution means. Upper part of central tubular current conductor is connected with power supply cord strands by means of above adapter. Heater body is connected to earthed neutral of supply transformer through additional body, intermediate adapter and distribution means. Central tubular current conductor having heat-resistant isolation means is fixedly connected to all disc electrodes isolated from heater body by heat-resistant isolation means provided with orifices located in areas between electrodes. Outlet valves and outlet orifices are created in additional body.

EFFECT: increased oil recovery from reservoir due to increased dry steam heat transfer into well bottom zone, reduced heat losses and simplified structure.

3 dwg

FIELD: oil industry, particularly equipment for paraffin removal from oil production wells provided with sucker-rod borehole pumps in different climatic zones.

SUBSTANCE: heating method for oil production well provided with sucker-rod borehole pump installed inside flow string, wherein sucker rods of borehole pump are hollow and are joined with each other in air-tight manner involves arranging flexible insulated heating cable inside hollow sucker rods; uniformly heating produced fluid over a distance from well head to lower end of flexible insulated heating cable up to temperature 2-60° exceeding temperature of paraffin melting in produced fluid, wherein produced liquid heating is carried out directly through hollow sucker rod string during reciprocation thereof inside flow string. Well heating device comprises flexible insulated heating cable and power source. Flexible insulated heating cable is connected to power source through heating control station. The flexible insulated heating cable is arranged in sucker rod string of sucker-rod borehole pump with outer diameter of 12-74 mm. Hollow sucker rods may reciprocate inside flow string. Sucker-rod borehole pump has drive to provide sucker rod string reciprocation inside flow string. The pump also comprises body, plunger piston and central hollow shaft. Lower hollow shaft part is connected with plunger piston. Upper hollow shaft part is attached to hollow sucker rod string through hollow sub. Lower end of flexible insulated heating cable is arranged inside central hollow shaft. The body is rigidly secured inside flow string. Plunger piston is connected with lower hollow sucker rod string end through solid shaft. In accordance to another embodiment sucker-rod borehole pump has drive to provide sucker rod string reciprocation inside flow string, body, plunger piston, central hollow shaft and suction and pressure valves. The body is rigidly secured inside flow string. Plunger piston is connected with lower hollow sucker rod string end through solid shaft. Plunger is secured to lower hollow shaft part, upper hollow shaft part is provided with sub, which connects hollow shaft with hollow sucker rod string. Hollow shaft extension is connected to lower hollow shaft part. Fastened to hollow shaft extension through hollow sub is additional part of hollow shaft string.

EFFECT: increased efficiency of oil production well heating, prevention of paraffin deposit on walls of wells having outputs typical of above well kind.

13 cl, 6 dwg

FIELD: oil industry, particularly methods or apparatus for cleaning boreholes or wells.

SUBSTANCE: method involves determining depth of possible paraffin contamination, heating cable length, heating cable power in dependence of product output and temperature of isolation heating cable material melting; lowering heating cable in paraffin formation zone; regulating cable temperature to maintain temperature 5-50°C above paraffin melting temperature along the whole cable length along with maintaining product flow temperature at well output 50°C above maximal outlet product flow temperature in the case of heating cable absence. Heating cable is wound on controlled winch drum and heated up to 45°C or more before cable lowering in well. Then cable is heated under control in different winding layers. High well head pressure is overcome by applying axial force of transporter, which provides equalizing of lowered heating cable weight with expulsive pressure at well head. Device comprises heating cable wound on controlled winch drum with at least one temperature sensor and control station connected with the cable and performing control of cable heating. One end of the heating cable may be connected to power source for cable heating and has temperature sensors located in each second cable winding layer. The sensors are electrically connected with corresponding temperature measuring instruments connected to winch drum. Transporter comprises guiding and tightening rollers, as well as heating cable arranged in well in predicted paraffin formation zone and control station connected to the cable to control cable heating. The transporter has single drive and sectional body including two parts. One part is drive one, another part is lid. Independent rollers are installed in each body part. Mating gear wheels are connected to roller shafts so that gear wheels may be kinematically connected one to another and to rollers. Lid comprises even number of gear wheels, shafts and rollers. Drive part includes odd number thereof. One shaft is connected with drive. Driving part gear wheels are connected in pairs with corresponding gear wheel installed in lid.

EFFECT: elimination of previous well cleaning operation, overcoming of high well head pressure without well killing, possibility of device mounting at negative ambient temperature and, as a result, increased oil output.

16 cl, 6 dwg

Oil heating device // 2263763

FIELD: equipment for oil wells, particularly to create optimal thermal conditions in production wells to prevent asphaltene-paraffin precipitations in production strings of oil wells and oil pipelines.

SUBSTANCE: device has heating cable to be lowered in area of potential paraffin formation, as well as power conductors, armor and temperature sensor leads connected to the cable. Temperature sensor is located inside heating cable. Armor is provided with outer polymeric shell and is connected up to protective grounding. Power conductors, armor and temperature sensor leads have intermediate electric connectors arranged in transition terminal box. Heating cable control system is connected to the box. Automatic switch with input power supply loop of power circuit is installed inside control system case. The switch is connected to warning light unit and to controllable rectifier bridge. The rectifier bridge is connected to measuring tool unit and output panel provided with electrotechnical leads. Control unit is connected with temperature sensor and with output circuits of measuring and operation unit by wires. Output circuits of measuring and operating unit are linked with control unit, which is connected to controllable rectifier bridge. Power supply of control circuits with input power supply loop of control circuits linked thereto is connected to control unit and with measuring and operating unit. Lower end of heating cable is immersed in production string and secured to it through packing means. Production string is installed in casing pipe. Hole annuity used to conduct heat from production string to ground is defined by casing pipe and production string. On ground surface heating cable passes through guiding roller, tensioning roller and is secured to lock.

EFFECT: reduced power inputs and increased reliability.

1 dwg

FIELD: survey of boreholes or wells, particularly in borehole geophysical instrument requiring additional thermal stabilization.

SUBSTANCE: mounting with members to be thermostated is arranged inside heat absorbing device. Heat absorbing device is made as a set of heat absorbers, each of which is made as hollow heat-conductive cylinder filled with heat absorbing material. Heat insulator is formed as cylindrical heat-protective shell with outer and inner ring-shaped ribs and adapted for receiving heat absorbers. Heat-conductive mounting have heat absorbing plugs connected to ends thereof. Each heat-absorbing plug is made as hollow heat-conductive cylinder filled with heat absorbing material. Surfaces of heat-protective case, heat-protective cylindrical shell, heat absorbers and heat absorbing plugs facing thermostating members are covered with heat absorbing coating. Surfaces thereof facing borehole are covered with heat-reflecting coating.

EFFECT: increased duration of working thermostating cycle and simplified structure of thermostat.

6 cl, 2 dwg

FIELD: oil industry, particularly for getting oil from wells provided with electric centrifugal submerged pumps under difficult geotechnical conditions, namely in presence of considerable asphalto-paraffin deposits or water encroachment and in the case of crossing well with permafrost beds.

SUBSTANCE: device comprises body and current lead unit having cable. Metal rod of current lead unit is installed in the body connected to bridge by threaded connection through seal rings. Electric heater is made as central current-leading anode-electrode isolated from the body and immersed in electrolyte, namely in mineralized well liquid, for instance in water emulsified in oil. Central rod has lower threaded part in which replaceable rod with dielectric adjusting means connected thereto is arranged.

EFFECT: increased oil production and well cleaning intensity, increased well cleaning rate.

1 dwg

Oil well heater // 2249672

FIELD: oil industry.

SUBSTANCE: device has current source, output cable, and heating cable. Current-conductive filaments of heating cable on one end are connected to each other, and by other ends via output cable are connected to current source. Parameters of said current source, output cable and heating cable are linked by following relation: where Lk - length of heating cable, L - total length of heating and output cables, U - current source voltage, - power coefficient, R0 - active resistance of one meter of phase (current-conductive line) of heating cable, R1 - active resistance of one meter of phase (current-conductive line) of output cable, P0 - active power, consumed by one meter of heating cable. Output cable passes through well mouth and downwards into well along hoisting pipe and is electrically connected to heating cable placed in the well. Brackets connect cables to hoisting pipe, placed inside casing pipe, with even spaces.

EFFECT: higher efficiency.

1 dwg

FIELD: oil industry.

SUBSTANCE: device has current conductor with pipe body mounted below it. On the surface of pipe body long-dimensional heating element is placed - cable with low electric resistance. Cable is mounted in ferromagnetic pipe along pipe body with possible forming of closed contour and feeding of powering alternating voltage into it through current conductor. Long-dimensional heating element is placed in form of multi-passage series of parallel long-dimensional heating element. Ferromagnetic pipe is made separated on sections. As long-dimensional heating element oil-resistant cable is used. Ferromagnetic pipe is welded to pipe body by discontinuous seam. Above long-dimensional heating element a layer of isolating material is applied for amplification of heating.

EFFECT: higher efficiency of well electric heater.

6 cl, 3 dwg, 1 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes lowering into well, to depth of forming of deposits, of linear heating element in form of pipes column in well or of metallic conductor and feeding conductor. Heating is performed by letting high-frequency electric current through feeding conductor while providing for its locking in head portion of heating system at depth of forming of deposits. Metal of linear heating element is effected with high-frequency field of feeding conductor. Frequency of electric current is set at lower limit on basis of condition, that depth of penetration of high-frequency field into metal of linear heating element was less than its thickness. Heat production is adjusted to provide primary heat production along linear heating element by decreasing space between the latter and feeding conductor and by increasing frequency of electric current from this lower limit. Locking of electric current in head portion of heating system between heating element and feeding conductor is performed through locking element, having falling dependence of resistance from temperature increase. Frequency of electric current is set at lower limit during lowering of heating system and is increased after passing whole depth of forming of deposits and obstructions. Locking of electric current in head portion of heating system can be performed through substance, having properties of weak electrolyte, for example, through well liquid, and frequency of electric current is increased in area of manifestation of effect of steep increase in its productiveness. Device has heating system, consisting of feeding conductor and linear heating element, and locker of electric current between these in its head portion. Feeding conductor is made of coiled and isolated conductors. Linear heating element is in form of column of pipes in the well or a bare metallic conductor. Cross-section of conductor is selected to be enough for supporting weight of heating system lowered into well. Electric current locker in head portion of heating system is made in form of winding of high-frequency wire, woven on ferrite core and placed inside metallic cover in such a way, that ferrite core by end portions is locked on this cover. Grade of ferrite of core is selected from condition, that its temperature of magnetic properties loss should exceed temperature of melting of deposits in a well, but is not greater than temperature of their combustion or carbonization. Current locker in head portion of heating system may be made in form of bare electrode, connected to feeding conductor and placed relatively to heating element in such a way, that between them a channel is formed along axis of bare electrode for passing of well liquid.

EFFECT: higher efficiency, higher reliability.

2 cl, 4 dwg

The invention relates to equipment of oil wells, by resistive heating cables surface types and systems temperature control cable

FIELD: oil and gas industry.

SUBSTANCE: method includes lowering into well, to depth of forming of deposits, of linear heating element in form of pipes column in well or of metallic conductor and feeding conductor. Heating is performed by letting high-frequency electric current through feeding conductor while providing for its locking in head portion of heating system at depth of forming of deposits. Metal of linear heating element is effected with high-frequency field of feeding conductor. Frequency of electric current is set at lower limit on basis of condition, that depth of penetration of high-frequency field into metal of linear heating element was less than its thickness. Heat production is adjusted to provide primary heat production along linear heating element by decreasing space between the latter and feeding conductor and by increasing frequency of electric current from this lower limit. Locking of electric current in head portion of heating system between heating element and feeding conductor is performed through locking element, having falling dependence of resistance from temperature increase. Frequency of electric current is set at lower limit during lowering of heating system and is increased after passing whole depth of forming of deposits and obstructions. Locking of electric current in head portion of heating system can be performed through substance, having properties of weak electrolyte, for example, through well liquid, and frequency of electric current is increased in area of manifestation of effect of steep increase in its productiveness. Device has heating system, consisting of feeding conductor and linear heating element, and locker of electric current between these in its head portion. Feeding conductor is made of coiled and isolated conductors. Linear heating element is in form of column of pipes in the well or a bare metallic conductor. Cross-section of conductor is selected to be enough for supporting weight of heating system lowered into well. Electric current locker in head portion of heating system is made in form of winding of high-frequency wire, woven on ferrite core and placed inside metallic cover in such a way, that ferrite core by end portions is locked on this cover. Grade of ferrite of core is selected from condition, that its temperature of magnetic properties loss should exceed temperature of melting of deposits in a well, but is not greater than temperature of their combustion or carbonization. Current locker in head portion of heating system may be made in form of bare electrode, connected to feeding conductor and placed relatively to heating element in such a way, that between them a channel is formed along axis of bare electrode for passing of well liquid.

EFFECT: higher efficiency, higher reliability.

2 cl, 4 dwg

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