Data transfer system for monitoring of hydrocarbon production process

FIELD: oil and gas industry.

SUBSTANCE: system includes a ground part in the form of a ground-mounted unit of a telemetric system of an electric-centrifugal pump installation and a well part including signal transfer medium of a combined communication channel, a submersible unit of the telemetric system of the electric centrifugal pump installation, an interface unit, receiving and independent transmitting and control modules and a measuring loop. The latter includes several measuring probes arranged one after another and parallel connected via a cable communication line connected to the independent transmitting and control module. The receiving module together with the interface unit and the submersible unit of the telemetric system is attached to the base of the submersible electric motor of the electric centrifugal pump installation. Information from the measuring loop is received with the independent module. Communication between independent and receiving modules is performed by means of a wireless acoustic channel. Then, measuring information is transmitted through the submersible unit via the combined communication channel to the ground-mounted unit of the telemetric system.

EFFECT: improving reliability of the data transfer system owing to preventing cable damage situations of the measuring loop and improving the efficiency of the monitoring process owing to decreasing complexity of lowering and lifting operations at erection and removal and excluding cases of tubing seizure with a geophysical cable.

3 dwg

 

The invention relates to the field of oil and gas production, in particular to methods and means of monitoring the current state of the technological process of production of hydrocarbons.

The modern process of production of hydrocarbons is a complex and costly undertaking. Its complexity is due to a number of uncertainties geological, technological, technical, and other character.

Improvement of operational systems operating in conditions of a priori uncertainty is a complex task, which can be efficiently solved on the basis of approaches that use the principle of feedback. Using this principle, in the first instance, to implement a mechanism for monitoring the current state of the production process [Iguliev. Conceptual framework and system management principles of flexible automated production engineering. / "Oil and gas", 2004, №5, p.62-69]. Effective monitoring of the production process (monitoring) possible on the basis of point sensing in real-time downhole environment in area of productive layers. This is especially important when separate simultaneous operation of several productive strata one well [Decree of the RF Gosgortekhnadzor from 06,06 .2003 No. 71 "On approval of Rules for the protection of mineral resources"]. You need to in order to trainout pressure, temperature, flow rate, moisture content and other parameters.

Known monitoring systems, using various downhole communication channels. [The Website of the Scientific-production enterprise "GRANT". Mode of access: free. Downhole gauges AMT. Date of access - 16.11.2011,] presents a system using Autonomous probes for registration in selected areas of the downhole parameter space and storage, with subsequent read after extraction to the surface. Such a system can be characterized as a system of virtual communication channel. Their advantage is maximum simplicity, the disadvantage is the complete lack of responsiveness.

Also known monitoring systems using signal data cable probes placed in the well space on the surface [Technology direct measurement of thermodynamic parameters of the well. Adzovic etc. // Oil industry. - 2006. No. 1 - P.72-75]. The advantage of such systems is their simplicity, relatively high bandwidth communication channel. The disadvantage of preventing their wide distribution, are the limitations and problems when conducting tripping and operation. These problems are due to the danger of accidents, connected the s gasket logging cable, used in this case, from the surface to the measurement zones in the well.

Known systems using wireless communication channels the well surface. The main advantage of such systems is the lack of cable. The disadvantage should include the requirement for more reliable isolation of the column tubing, which is not always economically justified. Also known system [Kulchitsky V.V. Well as the element of the smart system control and exploitation of hydrocarbons. // Oil industry. - 2002. No. 2 - P.95-97], transfer of wells by low-frequency electromagnetic channel, is used as the radiating dipole casing. The advantage of this system is the lack of cable in the well space. The disadvantages include some limitations and additional requirements, such as requirements to the specific resistivity of the surrounding rocks, the presence of dielectric inserts in the casing, which is not always feasible. In addition, the General lack of wireless channels based on the required transmission distance and high interference level is the requirement of forming a sufficiently strong signal in the transmission, which in turn leads to a significant increase of the power of the Autonomous what's the downhole power sources. These requirements greatly limit the scope, complicate the system design and equipment used.

The closest technical solution of the present invention is a data transmission system for monitoring the development of multilayer objects [adiev A. R. "Smart" wells. Monitoring the development of multilayer objects in ESP wells. // Engineering practice. - 2010. No. 1. - P.66-71], which uses complex wiring channel from the measuring portion to the surface and consisting of a ground block telemetering system (TMS), centrifugal pump (ESP) and borehole part comprising a transmission medium signals combined communication channel, submersible unit TMS, interface unit and the measuring train. Measuring the plume consists of measuring probes connected in series normalized cuts geophysical cable connected through the interface unit to the submersible unit TMS. With respect to the interface block all electrodes are connected in parallel. Well part of the TMS via the interface unit queries the measuring probes and writes the received information in the memory and, then, along with information about the parameters of the ESP, transmits to the surface, where it is transferred to the upper level of the information system. Transfer C the signals from the submersible unit TMS in the ground portion through the medium of the combined signals of the communication channel. This environment includes a power supply circuit of a submersible electric motor (SEM) and its stator winding. The advantage of this system is that it significantly simpler systems with wireless channel discussed above. Also lower the risks of accidents compared to the previously discussed system with signal cable. However, the risk of an emergency is not completely excluded, because in the process of tripping jams may occur and damage to the cable, the jamming of the column tubing (tubing). In addition, since the measuring loop is associated with the ESP, it is premature rise of ESP will definitely lead to unnecessary extraction from the well.

The task of the invention is to improve the reliability of the data transmission system due to prevent damage to the cable of the measuring loop and improving the technological process of monitoring the current state of the process of production by reducing the complexity of tripping during Assembly/disassembly, avoidance of jamming tubing logging cable.

The task is implemented using a data system for monitoring production of hydrocarbons containing surface portion in the form of a block telemetry system the mouth of ovci electrical submersible pump and the downhole portion, including the transmission medium signals combined communication channel, submersible unit telemetry system centrifugal pump, interface unit and the measuring train. Ground unit telemetry system is connected to the input-output with the first input-output media signals combined communication channel, the second input-output of which is connected to the first input-output of the submersible unit telemetry system, the second input-output of which is connected to the first input-output interface unit, and the measuring loop includes several measuring probes connected in parallel cable line. In addition, the system further comprises a receiving module and stand-alone transmitter and control module. Probes their inputs and outputs connected to the input-output standalone transmitter and control module, which is connected through an environment of transmission of acoustic signals in the form of a downhole space with the receiving module, the input-output of which is connected with the second input-output interface of the downhole unit. The receiving module, the external environment of the transmission of acoustic signals and Autonomous transmitter and the control unit form a wireless communication channel.

According to the invention, the Autonomous transmitter and control module of the system includes a transceiver PE edushi block, connected to the first input-output to the measuring circuit, and a second input-output to the first input-output measurement controller, the second input-output measurement controller connected to the first input-output of the first test interface, the second input-output of which is connected to the first input-output timer. To the second input of the timer signal from the output of the sensor commands, whose input is connected to the first input key, the output of the primary power source and the third input of the timer, and his third output connected to the second input of the key. The exit key is connected to the input of the first secondary power source, the fourth input-output timer connected to the third input-output measurement controller, the fourth output of which is connected in series through the modulator and the amplifier is connected to the emitter of the signal.

According to the invention, the receiving module of the data transmission system includes a signal receiver, the output of which is connected to the input of the amplifier. The amplifier output is connected to the input of block pre-filter, the output of which is connected to the input of analog-to-digital Converter. The output of the analog-to-digital Converter connected to the first input of controller communication channel, the second input-output of which is connected to the input-output second test interface. The third input-output test interface the sa connected to the first input-output downhole interface unit.

In the proposed technical solution the data transmission system uses a combination consisting of fragments of the communication channel. Accordingly, the data transmission system can be viewed as composed of various fragments. If we consider from the borehole bottom, the first fragment is similar to the prototype is a measuring train using a wired channel and comprising a series circuit of the downhole probes, United geophysical cable. Such a construction for a given interval of borehole space optimally, because it provides sufficient information content in the simplicity of execution.

In its upper part, the measuring loop is connected to auxiliary relays and control module, which is fixed at a predetermined depth of the downhole anchor. The above module is not connected structurally with ESP and tubing. With ESP rigidly associated receiving equipment of the wireless communication channel and the downhole portion of the TMS. The connection between the transmitting and receiving equipment is carried out by means of acoustic signals propagating in a borehole environment. Thus, implemented the second segment of the data transmission system. The third fragment system transmits measurement signals combined with the power circuit pad and the stator windings, the communication channel telemetry TMS, similarly about is otipo.

Thus, the proposed invention combines the simplicity of the technical solutions of the prototype and due to the distinctive characteristics of more reliable and easier to produce and therefore easier to use.

The invention is illustrated by drawings, where figure 1 shows a General block diagram of a data transmission system for monitoring production of hydrocarbons, figure 2 - structural diagram of the Autonomous transmitter and control module (AUM) and figure 3 - structural diagram of the receiving module.

The General block diagram of a data transmission system for monitoring production of hydrocarbons figure 1 contains: ground unit TMS - 1; the transmission medium signals of the combined channel - 2, submersible unit TMS - 3; interface block 4; the receiving module - 5; Wednesday transmission signals of a wireless communication channel - 6; Autonomous transmitter and control module - 7; measuring probes 8 and 9.

The system works as follows. Downhole Assembly including a self-contained transmitter and the control unit 7 and the measuring loop, consisting of measuring probes 8, 9, United cable line, descends in a given interval of the production well and is fastened through the downhole anchor whose design and method of application are known, for example, [the Website of OAO NPF Geofizika. - R is the press access: , free. Products and services/Equipment for the testing of formations/Packer and anchor equipment/mechanical Anchors type YAK. Accessed 16.11.2011,].

Then is lowered into the well column tubing with ESP to the bottom of the pad which is docked submersible unit TMS 3, interface unit 4 and the receiving module 5. Upon completion of this operation, by control station, ESP runs and downhole podneseno space begins circulation of the well fluid. This process is accompanied by specific noise, pressure fluctuations and other events at the device level 7 AUM, which registers the beginning of this process and returns to the operating state. Initiating operation of the measuring loop is in a function of time or external command. Measuring the information from the probes 8, 9 is made by the device 7 AUM. In the process of processing the measurement information generated telemetry frame, which is transmitted by the wireless segment of the combined communication channel through the receptacle 5 and the interface block 4 in submersible unit TMS 3 and then through the transmission medium signals combined channel connection 2 - ground unit TMS 1.

The construction of the measuring loop and TMS is known from the technical solutions of the prototype. When selecting a wireless channel preference given Akust the economic channel, as the most simple, with a high level of reliability of transmission. The transmission medium signals 6 of such a channel is a set consisting of borehole fluid, casing pipes and rocks adjacent to the casing pipe. In turn, the downhole fluid has a complex structure and includes liquid and gaseous hydrocarbons, aqueous solutions of salts and solids. It is obvious that the implementation of acoustic communication channel, in addition to several technical issues, which traditionally must be addressed when developing, such as reliability, throughput, and others, it is important to ensure the efficiency of the transmission. This is due to the autonomy of the work of measuring and transferring and long life operation without replacement (about 1 year). Obviously, the parameters of the transmitted signal in terms of variable composition downhole environment must adapt to meet the changing physico-chemical properties of the environment. Also a specific requirement to the proposed device is the need for hardware and algorithmic compatibility due to the presence of fragments in the structure of the communication channel, first of all it concerns the coordination bandwidth between segments.

With respect to the aforementioned requirements of the chosen structure auton is a lot transmitting and control module 7 figure 2 and the receptacle 5 figure 3.

The device AUM 7 figure 2 contains: emitter signal 11; amplifier 12; a primary power supply - 13; timer - 14; modulator - 15; key - 16; the first test interface - 17; the first secondary power supply - 18; sensor commands - 19 controller; measuring 20; receiver-transmitter block 21.

The device AUM (figure 2) works as follows. The power source apparatus is the block 13. This may be an electrochemical battery, such as lithium, or a turboelectric generator with the battery. Moreover, from the point of view of the organization of power all blocks AUM fall into two categories - permanently connected and periodically included. The timer 14 and the sensor 19 teams included immediately upon activation of AUM and remain in this state permanently. The timer 14 is a multifunctional device that is based on programmable logic such as a microprocessor with low power consumption. In accordance with a given program, it calculates the time intervals between measurements. Upon reaching the measurement time he connects by means of a key 16, the output of the primary power source 13 to the input of the secondary power source 18 that provides power to the other units AUM. The controller measuring 20 through the receiving / transmitting unit 21 scans the measuring probes 8, 9, collects and processes will measure the function information, forms a measuring frame. Further, in accordance with the selected parameters, generates signals at the input of the modulator 15, the output of which is amplified by the unit 12 and is supplied to the emitter 11. The power supply of the measuring probes is also from the power source 13.

A significant factor in the adaptation of the parameters of the transmitted signal, as previously mentioned, is the attenuation coefficient. The coefficient of attenuation of sound waves in a medium with viscosity and heat conductivity equal to [Leiden L. F. Acoustics: Textbook. aid for technical colleges. - M.: Higher. school, 1978. - 448 C.]:

α=ω22ρwith a3[43η+ζ+x(1Cν-1Cp)]

where ρ is the density, c is the speed of sound in it, ω - frequency, η and ζ are coefficients of shear and bulk viscosity, χ is thermal conductivity, Cνand Cp- heat capacity of the medium at constant pressure and volume.

In addition, the propagation of acoustic waves in multiphase and aerated (or MBF) creditopersonale stronger attenuation. In particular, there is some work showing that in aerated environments higher attenuation, particularly for secondary acoustic waves due to reflections, as well as due to resonant absorption of sound waves of low frequency range of f=0.4 to 2.0 kHz. The frequency of resonance absorption depends on the density of the transmission medium, pressure, size of micro bubbles. The attenuation coefficient in this case increases from zero to 40 dB/m resonant frequency of absorption of the bubble is equal to:

f0=12πR3γμ(p+2σR)ρ,

where p is the hydrostatic pressure of the liquid,γ=CpCνis the ratio of specific heat capacities of the gas, the coefficient of polyterpenes gas, σ is the surface tension coefficient at the boundary of the gas and the liquid, ρ is the density of the liquid, R is the bubble radius [Boshenyatov BV, Popov V.V. Attenuation of low frequency sound waves in the microbubble gas-liquid environment. // Basic research 2009-03].

Solenoidvalves estimates, the parameters of the environment, the attenuation factor in the range of sound frequencies ranging from 0.1 to 2 dB/m

Must accordingly be varied and the power of the transmitted signal. Evaluation of environmental parameters is performed in the controller 20 according to the data obtained from the middle to the AUM of the probe, since the composition and properties passing through it and the transfer medium 6 is almost the same.

Besides taking into account the attenuation in the development of the wireless communication channel is necessary to take into account the high level of interference present in the channel. To increase the likelihood of reliable reception of the transmitted zashumlennaya wireless communication channel information are two typical receive:

1) select the frequency band with minimal noise (the choice of window transparency);

2) use noiseless encoding.

The use of these techniques is implemented as a set of separate data transfer algorithms, a priori formed in the controller 20. The selection is carried out by an external command generated by the sensor 19, and a timer 14. The formation of teams from the surface is carried out by manipulation modes ESP, in the simplest case, turning off/turning on, and the command code:

N=f(TP)

where N is the number of the command, TP- time off ESP.

This technique is widely used for the organization of bilateral (the hollows of the STOs) communication with a downhole telemetry systems for drilling. When this sensor commands fixes the stopping time of the noise level or pressure pulsation, for example, and outputs a signal to the timer, which specifies the pause time and passes this parameter to the controller 20. It is obvious that is identified as a command only for TPin a certain interval by the timer 14. When identifying the command, respectively, the timer 14 also includes a key 16 for its recognition by the controller 20.

The first test interface 17 is required to connect directly to the controller 20 for diagnostics and testing, and programming of the timer 14. Changing the settings in the timer 14 may be in the acquisition and recognition of a corresponding command by the controller 20.

Technical implementation of all nodes and blocks known and is based on known and available solutions. Thus, the sensor command is a microphone or hydrophone amplifier and comparator with adjustable threshold. Duplex unit - based interface RS485 or others as a modulator may use a digital to analogue Converter (DAC) for converting digital code from the controller 20 into a corresponding analog signal. The emitter of the acoustic signal can be constructed using piezoelectric, Electromechanical devices, magnetostriction. The controller measure concentration of the nutrient is based on a number of commercially available microprocessors.

The structure of the wireless portion of the system associated with the ESP system, presented in figure 3. Here, in addition to the previously mentioned blocks, shows the structure of a receiving module, comprising: a second secondary power source - 23; the second test interface - 24; the controller of the communication channels 25; analog-to-digital Converter 26; block pre-filter - 27; receiver signal - 28; amplifier 29.

The operation of the device (figure 3) consists in the following. The signal receiver 28 having direct contact with the transfer medium 6, receives the sum signal + noise. This signal is in the form of pressure waves by a receiver 28 is converted into an electrical signal which is amplified by the block 29. Block pre-filter 27 increases the signal-to-noise to acceptable for further processing value. The signal is then fed to the input of analog-to-digital Converter 26, where it is the encoding for reading by the controller 25. The controller 25 is the final filtering of the signal and its detection. If the signal is false, it is ignored. If recognized telemetry frame, it is stored in the controller memory 25 for subsequent transfer through the interface unit 4 in the submersible unit TMS 3 at its request. Units power supply units are listed from the submersible unit TMS 3 through secondary sources is the IR power supply 23. Test interface 24 is designed for checking and adjustment module 5. The presence of two-way communication with the submersible unit TMS 3 via the interface unit 4 allows to adjust the signals in the controller 25, through, for example, changes in the parameters of the digital filter. The digital filtering algorithms are known, for example [Digital signal processing: a Handbook./ L.M. Goldenberg, D. Matyushkin, MN. A pole. - M.: Radio and communication, 1985. - 312 S.]. Thus, the reception signal is adaptively configurable.

As a receiver 28, it is preferable to use products based on piezoceramics, although other options are also possible.

Implementation of hardware and algorithms receiving module 5 is also known and is based on modern microelectronic database.

Thus, the proposed invention will improve the reliability of the data transmission system due to prevent damage to the cable of the measuring loop and increase the efficiency of the process of monitoring the current state of the process of production by reducing the complexity of tripping during Assembly/disassembly and exclude cases of jamming tubing logging cable.

1. Data transmission system for monitoring production of hydrocarbons containing surface portion in the form of notamn the th block of the telemetry system of the centrifugal pump and the downhole portion, including the transmission medium signals combined communication channel, submersible unit telemetry system centrifugal pump, interface unit and the measuring loop, and the ground unit of the telemetry system is connected to the input-output with the first input-output media signals combined communication channel, the second input-output of which is connected to the first input-output of the submersible unit telemetry system, the second input-output of which is connected to the first input-output interface unit, and the measuring loop includes several measuring probes connected in parallel cable communication line, characterized in that the system further comprises a receiving module and a transmitting and offline the control module, and probes their inputs and outputs connected to the input-output standalone transmitter and control module, which is connected through an environment of transmission of acoustic signals in the form of a downhole space with the receiving module, the input-output of which is connected with the second input-output interface of the downhole unit, and the receiving module, the external environment of the transmission of acoustic signals and Autonomous transmitter and the control unit form a wireless communication channel.

2. The data transmission system according to claim 1, characterized in that the Autonomous the first transmitter and the control unit includes a duplex unit, connected to the first input-output to the measuring circuit, and a second input-output to the first input-output measurement controller, the second input-output of which is connected to the first input-output of the first test interface, the second input-output of which is connected to the first input-output of the timer to the second input of which is applied the output signal from the sensor commands, whose input is connected to the first input key, the output of the primary power source and the third input of the timer, and his third output connected to the second input key, the output of which is connected to the input of the first secondary power source, the fourth input the output of the timer is connected to the third input-output measurement controller, the fourth output of which is connected in series through the modulator and the amplifier is connected to the emitter of the signal.

3. The data transmission system according to claim 1, wherein the receiving module includes a signal receiver, the output of which is connected to the input of the amplifier, the output of which is connected to the input of block pre-filter, the output of which is connected to the input of analog-to-digital Converter, the output of which is connected to the first input of the controller communication channel, the second input-output of which is connected to the input-output second test interface, and the third input-output of which is connected to the first input-output interface is wow downhole unit.



 

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24 cl, 27 dwg

FIELD: oil and gas production.

SUBSTANCE: method includes lowering downhole instrument in well, comprising receiver of noise signals, which is joined in contact with inner surface of casing string with the help of pressing devices or levers - wave guides, registration of radiation intensity change curves in process of lifting, as well as amplitude and time (wave) characteristics of received acoustic signals. Previously distribution of temperature abnormalities is registered along well bore depth with the help of downhole thermometre, intervals of their deviations from geothermy are detected. Change of amplitude-frequency characteristics of registered noise signals in areas of detected temperature abnormalities with open and closed levers - wave guides identifies availability or unavailability of fluids overflow, i.e. specifies quality of reservoirs isolation in borehole annulus.

EFFECT: invention makes it possible to increase validity of well cementing and reservoir beds isolation quality determination.

FIELD: oil and gas production.

SUBSTANCE: signal exciting radial resonance frequency vibrations is emitted into pipe-like element. There is measured a resonance frequency characteristic of radial vibrations excited inside the pipe-like element located in a well. There is obtained the resonance frequency characteristic of radial vibrations for at least a connected or not connected reference pipe-like element with the same resonance frequency characteristic as the pipe-like element positioned in a well. The measured frequency characteristic of the pipe-like element placed in the well is compared with the resonance frequency characteristic of radial vibrations for at least the connected or not connected reference pipe-like element. Connection or disconnection of the pipe-like element positioned in well is certified, if its measured resonance frequency characteristic of radial vibrations is approximately the same as for the connected or disconnected reference pipe-like element correspondingly.

EFFECT: upgraded accuracy for determination of quality of connection.

8 cl, 11 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil industry, particularly, to drilling wells, and may be used to control turbodrill rpm and drilling process. Proposed method comprises the following jobs: ground resonator is additionally arranged in pressure line and revolving downhole resonator is installed above turbodrill. Note here that the following steps are executed: generation of wide-band spectrum of sound frequencies by drill pump into pressure line, redistribution of frequencies power in spectrum generated by said drill pump in the low-frequency range generated by ground resonator, generation of wide-band spectrum of sound frequencies by revolving downhole resonator rigidly coupled with turbodrill shaft into drilling string inner space, periodic redistribution of frequencies power in spectrum generated by turbodrill in the low-frequency range generated by revolving downhole resonator in proportion to turbodrill shaft rpm.

EFFECT: higher reliability of control over turbodrill shaft rpm and drilling process.

7 dwg

FIELD: oil and gas industry.

SUBSTANCE: detection system of acoustic signals includes delivery pipe string for supply of heated fluid medium that generates acoustic signal, acoustic detector and acoustic signal analyser. Acoustic detector detects acoustic signal, and acoustic signal analyser interprets the detected acoustic signal. At that, delivery pipe string includes the first oscillatory device providing the supply of fluid medium flow to the well shaft in oscillating mode, and the above acoustic signal is created with pressure oscillations in fluid medium.

EFFECT: receiving the information on the system state.

15 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves process of formation hydraulic fracturing in well including recording of microseismic activity generated during hydraulic fracturing process. Also low-frequency waves of pressure (tube waves) are generated near well. Tube waves reflected from hydraulic fracturing are recorded on-line and location of microseismic events and reflection of tube waves from hydraulic fracturing is analysed.

EFFECT: increasing accuracy of determination of initial stage of splitting and accompanying phenomena during formation hydraulic fracturing.

7 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: monitoring method of axial load on bit at turbine drilling of the well equipped with drill pump, delivery line, drilling hose, gooseneck, swivel, drill column, turbo-drill, bit, with ground rejection filter additionally arranged in delivery line of drill pump, acoustically rotating rejection filter rigidly attached through shaft of turbo-drill to turbo-drill and bit, hydrophone with measuring equipment between swivel with gooseneck and drilling hose. It includes drill pump for supply of flushing fluid via drill column to turbo-drill, via delivery line, via drill column from drill pump to turbine blades of turbo-drill and brings into rotation of shaft turbo-drill rigidly connected to the bit. At that, frequency band in the spectrum generated with drill pump, ground rejection filter arranged in delivery line is converted; broad-band acoustic spectrum with constant amplitude is generated with turbine blades; broad-band acoustic spectrum is generated with impacts of teeth of roller cutters against mine rock, with varying amplitude dependent on the bit load; frequency band is converted as per amplitude from total acoustic spectrum consisting of spectra generated with turbine blades and impacts of teeth of roller cutters against mine rock to the range of low frequencies by means of amplitude-pulse modulation with acoustic rotating rejection filter arranged on turbo-drill shaft; at the same time, monitoring of the changing bit load is performed through hydrophone connected to measuring equipment as per varying amplitude of acoustic waves converted by means of amplitude-pulse modulation of low frequency range with acoustic rotation rejection filter.

EFFECT: improving monitoring reliability of bit axial load at turbine drilling.

1 ex, 10 dwg

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