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.

1 dwg

 

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.



 

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