The ac generator to power the autonomous downhole geophysical and navigation systems
(57) Abstract:The invention relates to drilling wells and is used to power Autonomous downhole navigation and geophysical instruments in the drilling process. The objective of the invention is to increase the life and reliability of the turbine, increasing capacity while reducing the size and weight of the generator. This generator comprises a sealed stator mounted on a stationary hollow shaft, a rotor mounted on bearings mounted on a stationary hollow shaft and secure sealing devices. The rotor is constructed in the form of the outer case, the outer side of which the edges of the installed rotor blades of the turbine, and on the inner side mounted permanent magnets. On the shaft with the two sides set the electrical connectors. One of the sealing devices supplied by spring and installed with the possibility of axial movement. This compensates for pressure and temperature expansion of the lubricating liquid of the bearing assemblies and in the gap between rotor and stator. Sealed stator is made in the monolith of electroconductive and non-magnetic material, such as stekloplasta for other purposes. Specifically the invention is intended to convert the energy of the drilling fluid in electrical and power electricity Autonomous downhole navigation and geophysical instruments in the drilling process.Known AC generator to power the Autonomous downhole during drilling of small diameter, comprising a stationary inner stator with header and fixed on the drive shaft of the external rotor, equipped with electromagnets (RF patent N 2060383, MCP E 21 In 47/022, 47/00 priority from 21.02.92 year).Known AC generator to power the Autonomous downhole geophysical and navigation complexes containing a turbine driven by the flow of drilling fluid, oil flooded the stator is filled epoxy compound, and the rotor of the alternator with permanent magnets located on the same shaft with the turbine (Molchanov, A. A., Shiraev A. H. Downhole Autonomous system with magnetic registration, M., Nedra, 1979, S. 102-103). He adopted as the nearest equivalent.This generator consists of a stator located inside the generator, and a six-pole magnetic ring rotor made from the outside. what using blades of the turbine, in turn, there are three stages of guide vanes collected in an external enclosure that increases the diameter of the device. The electrical connectors are on the bottom of the generator.To prevent the ingress of drilling fluid into the generator and bearing assemblies installed sealing device, the internal cavity of the generator is filled with transformer oil.Due to the fact that the turbine operates at different temperatures (from external air temperature up to +80...+130oC at depths of drilling wells up to 1200. . . 3500 m and more), and the oil has a high coefficient of thermal expansion, introduced the compensator pressure and thermal expansion of lubricating fluid (oil). The compensator pressure and thermal expansion lubricating fluid made in the input fairing generator. It consists of two thin core plates, one of which is convex and the other concave.The compensator pressure and thermal expansion of lubricant is designed to compensate for changes in the volume of oil in oil-filled cavity of the generator in operating conditions when the temperature and pressure inside the reliability, low capacity, large weight and dimensions of the device. In addition, the generator is very complex in design and ethnological. These shortcomings are due primarily to the fact that the drive turbine is used with the guide apparatus. The use of turbines with the alignment apparatus as actuator imposes high requirements to the quality of cleaning mud from fractions of drilling cuttings and other foreign objects, ingress of which the gap between the workers and the guide blades of the turbine may cause the system to stop (jamming). The presence of the guide vanes of the turbine increases the diametrical dimension of the generator, which is not desirable when drilling relatively small diameter.The second design flaw is the complexity and unreliability of the pressure compensator and thermal expansion of lubricant. Due to the elasticity of the walls of the compensator pressure of lubricant is always less than the ambient pressure. This can lead to the ingress of drilling fluid into the lubrication system.A further disadvantage associated with the location of all connectors on one side of the generator that obuslovlen and devices, requiring connection from the top, such as, for example, equipment used to transmit telemetry data to the surface of the fluid channel of communication.Objectives of the invention are to increase the life and reliability of the generator, the power increase with a simultaneous decrease in size and weight of the generator.This is achieved by the fact that in the proposed AC generator to power the Autonomous downhole geophysical and navigation complexes containing sealed stator mounted on a stationary hollow shaft, a rotor mounted on bearings mounted on a stationary hollow shaft and secure sealing devices, and made in the form of the outer case, the outer side of which is equipped with rotor blades of the turbine, and on the inner side mounted permanent magnets and mounted on the shaft of the electrical connectors; one of the sealing devices is supplied by a spring and mounted for axial movement to provide pressure compensation and temperature expansion of lubricating fluid, located in the bearing assemblies and in the gap between rotor and stator, with the electrical connectors are located on dwite of electroconductive and non-magnetic material, for example fiberglass.Conducted patent and technical studies have shown that the proposed technical solution has novelty and inventive step. In addition, it is industrially applicable, i.e., can be manufactured using standard equipment.Therefore, the proposed technical solution meets all the criteria of the invention.The invention is illustrated in the drawing, which presents the proposed generator.The generator consists of a stator 1, is airtight in the monolith of the electroconductive, nonmagnetic material, such as fiberglass, mounted on a stationary shaft (axis) with 2 electrical connectors 3 on the ends for connecting the electronic downhole equipment, and rotor 4 made in the form of a housing 5 mounted on the external side of the rotor blades of the turbine 6 and the inner side permanent magnets 7. The casing is placed on the bearings 8 and 9 attached to a fixed shaft (axis) 2. Bearing assemblies secured sealing devices 10 and 11, one of which 10 is movable in the axial direction and provided with a spring 12 to compensate for pressure and temperature is), the magnetic field of the permanent magnets 7 induces the appearance of an alternating current in the windings of the stator 1, which, through electrical connectors 3 is fed to the electronic sites of downhole tools (drawing downhole devices not shown).If the generator is used to power downhole geophysical systems with electromagnetic communication channel, then use the lower electrical connector 3, and if hydraulic communication channel, the upper electrical connector 3. This provides one of the main advantages of the proposed generator is that it can be used to supply electricity to any system.When immersing the device in the borehole during drilling or lowering and lifting operations and, accordingly, the temperature and pressure environment, changing oil and changing the position of the sealing device 10 to equalize internal and external pressure environments with some excess internal pressure.Application of the proposed invention provides the following advantages.1. The presence of electrical connectors on two sides of the shaft allows you to connect the generator with other devices located both above and is offered by the fluid, located at the edges (outside) the rotor blades of the turbine and fixed on the inner side permanent magnets allows to achieve the maximum possible linear velocity of the magnetic field of the permanent magnets relative to the stator windings and maximum power.3. No apparatus which prevents jamming of the turbine in case of contact with foreign objects in the drilling fluid or poor cleaning. In addition, the refusal of the guide vanes can significantly reduce the diameter of the generator.4. In the proposed generator rotor mounted on bearings secured small sealing devices. Supply one spring and execution of its movable in the axial direction enables it to additionally perform the function of the pressurizer and thermal expansion lubricating liquid of the bearing assemblies and in the gap between the stator and the rotor. This simplifies the construction of the generator, as it allows to eliminate the pressure compensator and thermal expansion as a separate device.5. The implementation of the stator on the stationary hollow shaft, sealed, monolith never the organizations. 1. The AC generator to power the Autonomous downhole geophysical and navigation complexes containing sealed stator mounted on a stationary hollow shaft, a rotor mounted on bearings mounted on a stationary hollow shaft and secure sealing devices, and made in the form of the outer case, the outer side of which is equipped with rotor blades of the turbine, and on the inner side mounted permanent magnets and mounted on the shaft of the electrical connectors, wherein one of the sealing devices is supplied by a spring and mounted for axial movement to provide pressure compensation and temperature expansion of lubricating fluid, located in the bearing assemblies and in the gap between rotor and stator, with the electrical connectors are located on two sides of the shaft, and rotor blades mounted on the sides of the hull.2. Generator under item 1, characterized in that the sealed stator is made in the monolith of electroconductive and non-magnetic material, such as fiberglass.
FIELD: electrical engineering; power supplied to borehole loads.
SUBSTANCE: proposed generator is characterized in that radial-axial bearing disposed at end of post on one end of stator is built of two bearings, one axial and one radial bearings, with flexible member inserted between part of frame and outer ring of one of these bearings, that additional radial bearing is installed on post at other end of stator, stuffing assembly of stator frame is disposed between end section of its movable part and post, and that it has end seal, annular cavity with radial-end collar and lubricant, as well as impeller, all mounted in tandem from additional bearing on butt-end of frame movable part.
EFFECT: enhanced reliability of generator protection against external adverse impacts.
1 cl, 2 dwg
FIELD: measuring engineering.
SUBSTANCE: inclinometer comprises housing, three-component magnetometric pickup, three-component accelerator, nonmagnetic platform, and adjusting device. The accelerometer is mounted on the nonmagnetic platform. The adjusting device is made for permitting changing the rolling and pitching of the magnetometric pickup with respect to the platform.
EFFECT: enhanced accuracy of measuring.
FIELD: industrial geophysics.
SUBSTANCE: method includes measuring gravity force acceleration by inclinometer via two mutually perpendicular axes and well zenith angle is calculated. Components of Earth magnetic field full vector are measured. Ferro-probe, positioned along Z axis in West-East plane is continuously controlled. In such a method azimuth will be proportional to angle of frame rotation, determined by acceleration meters. Azimuth is calculated from received data. To avoid azimuth error near critical plane, azimuth calculation is performed on basis of two given mathematical expressions. Then difference between calculated values is constantly determined. In case of proximity of equipment direction to critical plane, passing through Earth magnetic field vector and axis West-East in magnetic coordinates system, azimuth calculation is performed on basis of one of formulae with consideration of predetermined error.
EFFECT: higher precision.
FIELD: directional drilling, particularly to direct deflectors in vertical wells and in magnetic pipes, as well as in inclined wells with the use of diamagnetic tubes.
SUBSTANCE: method involves performing visual control of deflector action direction during lowering thereof in the well; directing the deflector on the base of visual image of difference between positions of compass laid in magnetic meridian plane on ground surface and in artificial magnetic field plane oriented relative deflector plane at well bottom and superimposed with horizontal limb, wherein above image is displayed on computer monitor. Device for above method implementation comprises sealed container with inclinometer having compass located in cylindrical body thereof. The cylindrical body has transparent upper part and is filled with inert liquid. The compass is formed as ball-shaped float with magnetic sensor. Centering bush is installed above the deflector and is provided with constant magnets. Magnetic field lines of above constant magnets are directed in deflector action plane. Inclinometer with visually accessible compass is installed in sealed container in front of TV camera. The container is linked with computer through cable which lowers the container into narrowed part of centering bush against stop. Horizontal limb with fixed compass position in magnetic meridian plane is recorded in computer memory.
EFFECT: increased quality, reliability and accuracy of deflector direction along with reduced labor losses due to present-day information technology usage.
2 cl, 2 dwg
FIELD: survey of boreholes or wells, particularly equipment to control spatial cased or uncased well position during well building.
SUBSTANCE: method involves measuring gravity acceleration projections onto measuring axes of borehole instrument, projections of Earth angular velocity onto corresponding sensitive axes of borehole instrument; measuring borehole instrument standoff angle during continuous movement and rotation thereof about longitudinal axis under the action of twisted logging cable, wherein in the first point of well path azimuth measuring the gyroscope is switched-on in angular velocity sensor mode for well azimuth determination and then gyroscope is switched to angle sensor mode and borehole instrument is switched to continuous motion mode to measure turn angles and then turn angle increment between measurements are determined; subtracting angle of gyroscope drift from Earth rotation from predetermined turn angle increment in X-direction to obtain turn angle increment in X-direction due to well path deviation; refining well path azimuth change in accordance with functional dependence obtained during inclinometer calibration with the use of testing rig; summing turn angle increment and full azimuth magnitude obtained at prior path point stop and performing continuous borehole instrument movement until turn angles reach maximal allowable values; stopping borehole instrument operation; shifting the gyroscope to angular velocity mode and repeatedly determining full well path azimuth value. Device comprises ground-based instrument connected to borehole instrument by cable. The borehole instrument comprises magneto-spherical gyroscope having angle sensors, namely sensors, which measure momentum along two measuring axes. Device also includes serially connected acceleration components generation unit and transmitting apparatus. Two control units to control mode of gyroscope operation are included in borehole instrument. The control units control gyroscope operation in X- and Y-directions and have the first and the second inputs connected to transmitting apparatus output and to control output of magneto-spherical gyroscope correspondingly. Control unit outputs are linked with data inputs of the transmitting apparatus. Each control unit comprises electronic switch, feedback voltage changer, the first and the second voltage summing units, two current sources for two coils of angle sensor, namely momentum sensor, differential amplifier, band-pass filter, phase-sensitive rectifier and integro-differential link. The first inputs of electronic switches are the first inputs of the control units, the second input of electronic switch in X-direction is linked with output of integro-differential link output in Y-direction. The second input of electronic switch in Y-direction is linked with output of integro-differential link output in X-direction. Output of electronic switch if each control unit is linked with summing units inputs through voltage changer. Outputs of summing units are connected with the first inputs of current sources having the second inputs linked with inputs of corresponding angle sensor coils. Angle sensor outputs are connected to inputs of differential amplifier having output connected to phase-sensitive rectifier input. Phase-sensitive rectifier output is connected to integro-differential link input. Phase-sensitive rectifier and integro-differential link outputs are outputs of the control unit, which controls gyroscope mode of operation.
EFFECT: increased accuracy and rate of well path measuring.
2 cl, 3 dwg
FIELD: well drilling, particularly to control well direction.
SUBSTANCE: device comprises drilling bit, downhole motor with whipstock, whipstock position measuring module, hydraulic orientator and measuring and telemetric module arranged in non-magnetic sub and connected with ground-based reception and processing complex. Whipstock position measuring module comprises body with central flushing orifice on which electrode is arranged. The electrode is located between insulators and is electrically isolated from the body. Electric circuits, measuring sensors, power source and transmission means are installed in the body. Reception and processing means are included in measuring and telemetric module so that the reception and processing means is separated from whipstock position measuring module by electric spacer and is adapted to receive electric signals from whipstock position measuring module transmitter. Accelerometers may be included in measuring sensors of whipstock position measuring module. Whipstock, whipstock position measuring module and hydraulic orientator may be connected one to another by quick-releasable connector, for instance by thread.
EFFECT: increased well quality, possibility to use flexible drilling pipes, namely coiled tubing, for well drilling.
3 cl, 2 dwg
FIELD: wells, particularly devices to determine slope or direction of oil, gas, geothermal, iron ore and other wells included in directional well drilling systems.
SUBSTANCE: method involves measuring angular velocity by fiber-optic gyroscope and accelerometer installed on rotary panel so that the fiber-optic gyroscope and accelerometer may be installed in at least 8 positions; determining ideal sinusoid parameters, namely amplitudes and initial phases, from measured signals with the use of progressive approximation method; calculating azimuth and zenith angles from the ideal sinusoid parameters. During signal processing systematic error components of sensitive members are compensated.
EFFECT: improved operational capabilities, reduced mass, size and power inputs.
5 cl, 3 dwg