Method of transmitting measurement data by cable-free telemetric system during well drilling
FIELD: radio engineering, communication.
SUBSTANCE: disclosed is a method of transmitting measurement data by a cable-free telemetric system when drilling wells, involving encoding and transmitting information via a phase-shift keyed signal in form of a sequence of pulses, synchronising the signal and receiving the encoded information by a land receiver. One-time (initial) phase synchronisation of precision quartz-crystal oscillators of the transmitter of the bottom telemetric system and the land receiver is carried out by accumulating data on the transitioning of the signal through zero and one-time synchronisation of signals using a priori information on the bottom telemetric system at the current moment in time is also carried out. Prolonged stability of synchronisation of said oscillators is ensured by adjusting the phase of the quartz-crystal oscillator of the land receiver relative to the statistically determined transitioning through zero of the signal of the transmitter of the bottom telemetric system.
EFFECT: higher capacity of the communication channel and high noise-immunity thereof.
The present invention relates to the field of drilling and intended for transmission geophysical information on electromagnetic or hydraulic communication channel.
When using wireless electromagnetic or hydraulic communication channel being measured downhole parameters, their coding and transmission to the surface. The transfer is carried out by encoding information, for example, noise-like signal with phase manipulation signal whose frequency is in the range from fractions to units of Hertz.
Known methods for synchronization of data transmission between the transmitter and receiver assume that synchrophasing.
Known program character by character and word by word synchronization with application of the pilot signal (Mukhametov ZINAIDA, Rosenstadt O.M., Shabaev E.A. tokarski V.R. and Kuznetsov GF Informational and computational structure of instruments ZIT - 1 // Geophysical studies in the process of drilling and well testing (Tr. Vniineftepromgeofizika). - Ufa, 1989. - Issue 19, p.102).
In this method, Singapore occupies 16% of the time the entire transmission cycle and represents photomanipulating signal, consisting of 61 characters. Message from downhole information immediately after synchrophasing. Entering the synchronism is accomplished by sequential step is on search. At each step is the calculation of correlation sums received and reference signal. The decision about the presence or absence of synchrophasing in the received signal based on the comparison of the correlation sum with two thresholds, and the position of synchrophasing in the received signal is determined by the maximum of this sum. As consistent taking the maximum of the correlation sums are at the end of synchrophasing in the received message, its presence indicates that what follows is transmitted downhole information. Character and word by word synchronization is carried out by counting the increments from the end of synchrophasing. At the end of the entire message, consisting of 5 words, the process is repeated, starting with the search synchrophasing.
A disadvantage of the known method is the presence of synchrophasing in each block of transmitted data, which reduces bandwidth and the need for re-synchronization in an unstable reception, requiring not only receiving unit synchrophasing, but the whole package of geotechnical data.
A known method of forming packages of measurement data wireless telemetry system in the drilling process (U.S. Pat. Of the Russian Federation No. 2351960, publ. 10.04.2009,).
The method includes encoding each of the four bits informationcompany signal (PSS) with a length of 16 bits, and transmitting the encoded information using photomanipulating signal. For the transmission of information can be used carrier frequencies 10,17; 5,09; 2,54; 1,27 or of 0.64 Hz, phase modulated. Each transmitted packet contains the beginning of synchrophasing, consisting of four PSS, which are not found among PSS, which are encoded measurement data. Bits Zenith, azimuth and whipstock are separated by different groups coded in PSS independently. Information transfer occurs in the following sequence: Singapore, the whipstock, the Zenith, the whipstock, azimuth, diverter, an additional parameter, the diverter. Each value of the whipstock passed two sequences of four bits. The value of the Zenith angle and azimuth transmit three sequences of four bits. The importance of the additional parameter is passed two sequences of four bits. Additional channels can be transmitted, the speed of the generator, the temperature, the frame number of the static measurement, the characteristic of the battery discharge device or one of the logging options.
A known method of forming packages of measurement data wireless telemetry system in the drilling process, including the encoding of every four bits of information noise-like signal with a length of 16 bits, the transmission of information using photomanipulating signal, each transmitted packet contains synchronous the lku, Zenith, azimuth, diverter and an additional parameter, the transfer of information blocks containing two types of packages: standard package and special packets transmitted bit (Patent RF №2394257, prior. 12.11.2008,, publ. 17.07.2010,, EW 47/12) (adopted as a prototype).
A disadvantage of the known method is the existence of synchrophasing, which reduces the bandwidth of the communication channel.
The present invention solves the problem of increasing the bandwidth of communication and improve its noise immunity.
This task is solved in that in the method of transmission of measurement data wireless telemetry system (downhole telemetry system) in the process of drilling wells, including coding and transmission of information photomanipulating signal as a sequence of pulses, the synchronization signal receiving coded information terrestrial receiver, perform a single (initial) synchronization phase precision quartz oscillators of the transmitter downhole telemetry and ground receiver by accumulation of the statistics of the signal transfer through zero and one-time synchronization signals using a priori information downhole telemetry at the current time, for example, values of the Zenith angle, the level of gamma radiation, vibration, neprezentare, long-term stability of synchronization of these generators provide the correction phase of the crystal oscillator ground receiver relative to the statistically determined from the zero-crossing signal transmitter downhole telemetry.
The figure presents a diagram of the device for implementing the method.
The device includes a ground part and a downhole telemetry system.
Downhole telemetry system consists of blocks: precision quartz oscillator 1, a controller 2, a transmitter 3, the power supply unit 4 is placed in the housing 5 TeleSystems, a radiating dipole 6.
The ground portion includes: a signal receiver 7 (ground receiver), the controller 8, the computer 9, a precision quartz oscillator 10 self-powered - battery.
In the implementation of the proposed method using two high-precision quartz oscillator 1 and 10 in the downhole transmitter 3 and the ground receiver 7, which must always be included and synchronized. From the ground receiver 7, the data is transmitted to the computer 9.
For the transmission of information is used carrier frequency in the range 0.3 Hz÷10 Hz, phase modulated pseudonoise signal in a sequence of sine waves shifted in phase by 180°.
For the normal correlation of the reception signal is allowed phase shift up to a quarter period. Now lie the instability frequency thermo-compensated technological quartz 0.5·10 -6further improved. Stability oven controlled quartz by 1-2 orders of magnitude higher. When the carrier frequency of 2.5 Hz and thermo-compensated technological quartz synchronize the downhole transmitter 3 and the ground receiver 7 persists for more than 5 days.
The synchronization is performed only once on the surface, when the signal is not distorted by noise in two stages: first, the signal is synchronized in phase, then there is a synchronization on the received parameters. The synchronization phase is performed on the signal transition through zero, i.e. change its sign. Recruited the necessary statistics on transitions through zero to improve the accuracy of the moment of transition. Since the synchronization signal is stored by day, and the statistics of the transitions can be dialed in for extended periods. When working downhole telemetry in the hole point of signal transition through zero is continuously monitored and the phase of the ground receiver 7 is adjusted, adjusts quartz oscillator 1 downhole telemetry. Apply several algorithms to improve the accuracy of determining the passing of the signal through zero, i.e. improve the accuracy of the synchronization phase. Thus, the downhole transmitter and terrestrial receiver constantly synchronized.
The second stage of synchronization is to find the expected (known) values set with the first corridor of tolerance Zenith angle, the vibration level, the level of gamma radiation, the voltage of the batteries and other known parameters. The coincidence of the received values with the expected means the completion of the synchronization process. The sustainability of the reception is ensured by binding to specific current time value bits for each parameter.
The difference of the proposed method from the prototype is the lack of synchrophasing in each block of transmitted data, and the synchronization procedure is performed only before work and once only on known parameters at the current time. The stability of the reception signal is not the reception of synchrophasing and stability of quartz oscillators downhole transmitter and the ground receiver and adjusting their phases including points of zero crossing.
In the implementation of the proposed method options are available for receiving and processing immediately after any failure (no data in the unstable reception, cable break at the entrance of the ground receiver, power failure receiver failure of the ground computer, power failure in General on the rig), and not as a result of resynchronization, requiring a time of reception of the entire unit synchrophasing together with geotechnical data.
The data transmission method of measuring wireless telemetry system (downhole of Telese theme) in the process of drilling wells, including coding and transmission of information photomanipulating signal as a sequence of pulses, the synchronization signal receiving coded information terrestrial receiver, characterized in that the implement time synchronization phases precision quartz oscillators of the transmitter downhole telemetry and ground receiver by accumulation of the statistics of the signal transfer through zero and one-time synchronization signals using a priori information downhole telemetry at the current time, with long-term stability of synchronization of these generators provide the correction phase of the crystal oscillator ground receiver relative to a statically-defined zero-crossing signal transmitter downhole telemetry.
FIELD: information technology.
SUBSTANCE: device contains terminal for receiving incoming data of asynchronous data stream, terminal for outputting incoming data stream on external load, terminal for connecting external drive generator of reference frequency pulses, circuit of internal drive generator of reference frequency pulses, circuit for extraction of clock synchronisation pulses from incoming asynchronous data stream using reference frequency pulses of drive generator, controlled time-delay line for pulse signals, phase detector circuit for pulse signals, counter/divider of reference frequency pulses, two counters/dividers of clock pulses with the same division factor.
EFFECT: higher long-term receive stability of continuously incoming asynchronous data stream by means of elimination of faults occurring from diversity in frequencies of transmitting and receiving side generators.
4 cl, 1 dwg
FIELD: physics, radio.
SUBSTANCE: invention concerns electronics for measuring of performances of high-speed signals which are applied in digital registrars of high-speed processes and radar-tracking receivers. The digitiser of signals (SD) with the nonuniform architecture of a file of sample contains joined parallelly with a line of an input signal sample and storage amplifiers (SHA), a set of the integrators joined to SHA outputs, a set of analog-to-digital converters (ADC), the integrators joined to exits and the generator of an adjustable delay executed with possibility of maintenance of functioning each SHA, the integrator and ADC in corresponding time intervals. For productivity increase in SD the generator of an adjustable delay, contains the block of definition of number of the cycles, executed with possibility of definition of number of cycles of integration in each point of a temporary scale of an input signal depending on a standing of a handled point of a signal on a temporary scale.
EFFECT: productivity increase.
FIELD: radio equipment engineering, can be implemented for construction of devices for detection and frequency estimation of radio pulses, including those belonging to radio communication and radio-location systems.
SUBSTANCE: adjustable band filter is inserted in control system, its state is controlled using information about derivative of output voltage of filter, also performed processes concerning: forming of quasi-optimal synchronous processing of device control signals and correction signals using first synchronous detector, forming of cophased oscillation using system for phase frequency automatic-correction, using correction signals after first synchronous detector, synchronous and cophased signals processing is performed using second synchronous detector, for measuring value of unknown frequency of low-noise output oscillation of phase frequency automatic-correction system generator is used. Insertion of derivative-based check connection provides for automatic control over state of filter under effect from powerful interference, to decrease negative effect of aforementioned interference.
EFFECT: increased resistance to interference due to addition of robust properties to device as well as cophased processing of received oscillation and taking of decision concerning frequency estimation using indirect method.
FIELD: radio engineering; receiving devices.
SUBSTANCE: proposed device provides for selecting each of four signals constituting input mixture, each of these four signals being separated or selected upon correcting three other signals of mentioned input mixture thereby eliminating impact of signals being selected on selection procedure of separate signal. This signal phase selector has four adequately interconnected channels. First channel incorporates phase-locked loop and selected signal estimate shaping unit 21, selected signal detection and its estimate switching unit 31, subtracter 11, and additional subtracters 11.1-1.3.
EFFECT: enhanced noise immunity and quantity of signals being selected.
1 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: system includes flexible tubing having a fibre optic conductor and a section with instruments. At that, fibre optic conductor is located in a cavity flush with outer surface of the section of flexible tubing equipped with instruments. Besides, the above cavity is curved. The system also includes a device for fixing the fibre optic conductor on the surface of the wall of flexible tubing, an adapter through which the above conductor passes to an internal fibre optic conductor, and a connecting coupling. The latter has the possibility of data transferring by means of contactless telemetry.
EFFECT: improving measurement efficiency of one or more parameters in the well along a certain zone of the well.
21 cl, 9 dwg
SUBSTANCE: method to transfer information from a well consists in the following: using a surface generator, electrical current is excited in a string of metal pipes, which generates electromagnetic field spreading in the rock of the well, which reaches the bottomhole area and creates the difference of potentials between the metal string and its isolated part. Receipt of information from the bottomhole is carried out depending on modulation of the voltage value required for stabilisation of the surface generator DC. The surface generator is a source of a stabilised DC. Besides, the surface generator is connected with one clamp to a surface part of the pipe string, and by the other one - to a grounded electrode that is remote from the well head. At the same time for transfer of information from the bottomhole the lower and upper parts of the string are closed or opened, changing the efficient value of conductivity between the grounding electrode of the current source and the metal string. When the key is closed, the specified efficient conductivity increases, and voltage on the current source clamps reduces and is recorded by a recording unit. By variation of the measured voltage the parameters of the drilled bed are decided.
EFFECT: increased reliability of information transfer from a bottomhole and expansion of its application area.
2 cl, 1 dwg
FIELD: measurement equipment.
SUBSTANCE: formation method of measurement data packages of a cable-free telemetric system during the well drilling involves coding of every four bits of information with a noise-like signal (NLS) with the length of 16 bits and information transfer by means of a phase-shift signal, packages of various types. The data measured in dynamics in the turbine drilling mode is transferred in S-O1-Z-O2-A-O3-"Г"-O4 packages consisting of synchronisation sending (S), diverter (O1), zenith (Z), diverter (O2), azimuth (A), diverter (O3), gamma background level ("Г"), diverter (O4). The data measured in dynamics in the rotary drilling mode is transferred in S-1-"Г"1-R1-"Г"2-R2-"Г"3 packages consisting of synchronisation sending (S), special NLS equal to one and serving for identification of the package type, gamma background level ("Г"1), formation resistance (R1), gamma background level ("Г"2), formation resistance (R2), and gamma background level ("Г"3). The data measured in statics is transferred with S-9-"Г"1-Z-R-A-"Г"2 packages consisting of synchronisation sending (S), special NLS equal to 9 and serving for identification of the packages type, gamma background level ("Г"1), zenith (Z), formation resistance (R), azimuth (A), and gamma background level ("Г"2).
EFFECT: increasing informativity of transferred parameters owing to increasing transfer frequency of logging parameters of gamma background and formation resistance.
FIELD: oil and gas industry.
SUBSTANCE: method for determining the saturation of reservoir beds involves determination of porosity coefficient of the investigated formation using two-probe neutron-neutron logging as per thermal neutrons. Calculation of porosity function as the ratio of intensities of flows of thermal neutrons. Recording of GIRZ spectrum intensities. Measurements are carried out during cement setting period of time after 2-4 days from the beginning of cementing of the well shaft, or 2-4 hours after the drilling tool has been raised out of the well. There are cross-plots as per dependences. On cross-plots there performed is approximation of lower points of quadratic function, which correspond to water-bearing formations with drill mud filtrate, and the function reflecting "deficiency of density and hydrogen content" in the nearest zone is calculated as per the given formula.
EFFECT: enlarging the range of application; improving its accuracy and informativity.
4 dwg, 2 cl
FIELD: oil and gas industry.
SUBSTANCE: method involves lowering of packers and equipment for extraction (pumping) of product in interval of product extraction on tubing string located against each productive formation. Down-hole measurements are performed by sensors. Obtained date is transmitted to ground receiving-processing unit by means of electronic self-powered measurement modules transmitting data signals by tubing string by electromagnetic pulses to common electronic self-powered transmitting module. Module is installed in tubing string assembly above the highest productive formation. Data high-frequency signals are amplified and transmitted to ground receiving-processing unit through rock. Equipment for extraction (pumping) of product is controlled by communication channel or by hydraulic communication channel using independent electronic modules. Modules contain housing in which the following is installed: valve for control of supply (removal) of fluid medium controlled by step-type tiny engine with driving mechanism of valve gate rotation, autonomous power supply unit, receiver of fluid pulses and dipole receiver of electromagnetic oscillations, amplifier modules of decoding device and power amplifier.
EFFECT: improving efficiency of monitoring of simultaneous separate operation of wells by means of provision of reliability of data transmission by two-way wireless communication between well equipment and ground receiving-processing unit.
8 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: method of hydrodynamic investigations involves lowering of equipment for investigation of formation with self-contained measuring device by assembly pipes. Interval of investigation is sealed by packer. Arrangement of fluid influx sequence is provided by feed valve, investigated parameters are recorded by self-contained measuring device at the same time. Packers are released, equipment is lifted to wellhead by assembly pipes with further decoding of self-contained measuring device records. Tubing string is preliminary equipped with a seat, in which detachable receive/transmit module is lowered by geophysical cable. Parameters measured by self-contained measuring device are recorded by electromagnetic communication channel in predetermined time mode. Equipment corresponding to the method is also proposed.
EFFECT: improving efficiency of works on formation investigation by formation tester on pipes, improving informativity and speed of decoding or recorded parameters.
2 cl, 1 dwg
SUBSTANCE: downhole system comprises a three-phase power cable, a source of supply, an electric submersible pump and a gauge. The cable stretches from the surface into a well and may provide supply to the three-phase motor with certain voltage and frequency. The source of supply is connected to the three-phase power cable and may produce AC for supplying to gauges, sending it along all three conductors of the three-phase power cable. The pump is connected to the three-phase power cable and comprises a three-phase motor receiving supply along the specified three-phase power cable. The gauge is connected to the three-phase power cable using a capacitance link with the possibility to receive AC of gauge supply. At the same time the value of the current voltage is lower than the value of the three-phase motor supply voltage, and frequency is higher than frequency of the three-phase motor supply voltage.
EFFECT: improved system of downhole gauge supply.
18 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: logging device includes housing, centring assembly and scanning head. Housing is oriented along longitudinal axis. Centring assembly positions the housing in the well centre and includes the first slide and group of centring brackets connected to it. The first slide has the possibility of sliding along longitudinal axis so that random control of radial retraction of the above group of centring brackets can be provided. Scanning head rotates scanning sensors axially inside the well around longitudinal axis and includes the second slide and connecting brackets connecting the second slide to the specified scanning sensors. Besides, the second slide has the possibility of sliding along longitudinal axis so that random control of radial retraction of the above sensors can be provided.
EFFECT: increasing the logging efficiency.
20 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: method applied for signal transfer to measuring instrument in well shaft involves acceleration along measuring instrument axis in the specified acceleration profile. Pre-determined acceleration profile corresponds to the signal subject to transfer. Axial acceleration of measuring instrument is recorded, and signal from recorded axial acceleration is decoded. Signal recording system for measuring instrument in the well shaft includes accelerometer oriented along longitudinal axis of measuring instrument, and device for comparison of measurements made by means of accelerometer at least for one pre-determined acceleration profile.
EFFECT: easier signal transfer and simpler design.
15 cl, 4 dwg
FIELD: information technology.
SUBSTANCE: system for monitoring temperature of extended objects has temperature sensors, a means of collecting data coming from the extended object, a means of transmitting data, a computer for assessing and collecting data, lying away from the extended object and meant for receiving and assessing data. According to the invention, the system for monitoring temperature of extended objects further includes an Ethernet and the Internet, a network hub, temperature sensors, each lying in a separate protective housing and fitted with an integrated interface, connected to each other by a flexible cable and forming m thermistor chains with nm temperature sensors in each.
EFFECT: high accuracy of measurement and reliability, simple system for monitoring temperature of extended objects, wider field of use.
FIELD: well drilling technologies.
SUBSTANCE: method includes cutting a special conic thread, which is made with triangular profile with rounded corners, at sleeve and nipple portions of electric separator, sand-stream treatment is performed and also grease is removed from parts screwed together. After that a sub-layer is applied to increase adhesive metal properties. Composition dielectric material is applied to threaded connection of nipple portion, after that thread shape is altered by this material, then adhesive is applied to screwed surfaces of threads and sleeve and nipple portions of electric separator are screwed together. After that a layer of dielectric substance is applied along outer surface of subs. Inside the electric separator a dielectric insert is mounted or dielectric film is applied by pressing method with use of press-form. Dielectric film is applied on outer surface of electric separator by forming method under pressure with use of press-form or of composition dielectric material by winding method.
EFFECT: higher durability and reliability.
1 dwg, 1 ex