SU1686145A1 - Device or borehole deviation control during drilling - Google Patents

Abstract

The invention relates to the drilling of wells and is intended to monitor the direction of the curvature of a well bore. The goal is to improve the accuracy and efficiency of determining the curvature of the wellbore. On the leading pipe 1 of the drill string installed sensors (D) 2 and 3 transverse vibrations and D 9 longitudinal vibrations. Signals from D 2 and 3 are fed to the inputs of selective amplifiers (SU) 5 and 6. Signals from D 2 and 9 are fed to the inputs of spectrum analyzers (AC) 8 and 10. At the outputs of AC 8 and 10, signals appear that reflect the frequency and amplitude of the frequency components of these signals. From the AC outputs 8 and 10, the signals are transmitted to the control unit 11. If the signals have the same frequency, then a signal appears at the output of control unit 11 and is fed to control inputs of SU 5 and 6, which separate and amplify information signals. The presence of D 9, AC 8 and 10 and a control block 11 associated with the control inputs of SU 6 and 5. allows you to automatically select the frequency of the transverse polarized wave. 1 il. (Ls

Description

The invention relates to drilling, in particular, to devices for monitoring the direction of borehole curvature.

The purpose of the invention is to improve the accuracy and efficiency of monitoring the direction of the curvature of the wellbore.

The drawing shows a block diagram of the device.

The device contains the following nodes. On the leading fur coat 1 of the drill string, sensors 2 and 3 of transverse oscillations are installed using the frame 4 The outputs of sensors 2 and 3 are connected respectively to the inputs of selective amplifiers 5 and 6, the outputs of which are connected to the accumulator inputs

summing memory unit 7. The output of the sensor 2 transverse vibrations are also connected to the input of the first analyzer 8 of the spectrum.

The leading tube 1 has a longitudinal oscillation sensor 9, the output of which is connected to the input of the second spectrum analyzer 10. The outputs of the analyzers 8 and 10 of the spectrum are connected to the inputs of the control unit 11, and the output of the latter is connected to the control inputs of the selective amplifiers 5 and 6.

The operation of the device to determine the direction of curvature of the borehole uses the phenomenon of generation in the drill string of a polarized component of transverse oscillations and associated with

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its component of longitudinal oscillations with the same frequency. The device automatically (by the coincidence of the frequencies of these components) extracts a polarized component from the spectrum of transverse oscillations, and the direction of the scatterv1 of the borehole hole is determined in the direction of its polarization.

The device works as follows.

Sensors 2 and 3 convert the components of transverse oscillations on two axes into an electrical signal, and sensor 9 converts the longitudinal vibrations of the drill string into an electrical signal. The signals from sensors 2 and 3 are fed to the inputs of selective amplifiers 5 and 6. The signals from sensors 2 and 9 are fed to the inputs of analyzers 8 and 10 of the spectrum. Depending on the amplitude of the frequency components of the signals arriving at the inputs of the analyzers 8 and 10 of the spectrum, the signals reflecting the frequency and amplitude of the frequency components of these signals appear at their outputs. From the outputs of the analyzers 8 and 10 of the spectrum, the signals arrive at the control unit 11. When there are signals on both inputs of the control unit 11 with the same frequency, a signal representing this frequency appears at its output.

The output signal from the control unit 11 is fed to the control inputs of the selective amplifiers 6 and 5. The selective amplifiers 5 and 6 separate and amplify information signals, the frequency of which depends on the signals arriving at the control inputs of these amplifiers. Thus, at the outputs of the amplifiers 5 and b, the signal components appear with a frequency that is present among both the transverse and longitudinal vibrations. The selected signals are proportional to the components along two axes of polarized oscillations of the drill string.

To determine the direction of the linearly polarized wave vector, an accumulative-summing storage unit 7 is used, the inputs of which receive amplified and filtered signals proportional to the component of the oscillations on two axes from amplifiers 5 and 6. The accumulative-storage unit 7 performs operations the vector addition of filtered and amplified components of the two axes of the signals, the accumulation and storage of the received information, as well as the extraction of useful information (display of the linear-polar vector ovannoy wave).

Thus, the presence of a longitudinal vibration sensor, spectrum analyzers 8 and 10, and a control unit 11 associated with the control inputs of the selective amplifiers 6 and 5, makes it possible to automatically select the transverse frequency

0 polarized wave.

The inclusion of a longitudinal oscillation sensor of the drill string, two spectrum analyzers, a control unit, and the use of selective amplifiers that incorporate band-pass filters with varying tuning frequency make it possible to eliminate the operation of preliminary determining the frequency band in which there are oscillations caused by linear-field polarized wave, the direction of polarization of which is associated with the direction of the curvature of the wellbore. The proposed device automatically tunes to the desired frequency

Claims (1)

5, which improves the accuracy and efficiency of determining the direction of borehole curvature, especially in cases where this frequency changes during drilling. Invention Formula 0Direction control device curvature of the wellbore during drilling, containing transverse vibrations of the drill string, located on mutually perpendicular areas of the bones, and a cumulative memory unit, characterized in that, in order to improve the accuracy and speed of monitoring the direction of the curvature of the wellbore, 0 it is equipped with a longitudinal oscillation sensor of a drill string, two spectrum analyzers, a control unit and two selective amplifiers, with the outputs of the first and second transverse vibration sensors being connected to the inputs of the accumulating-summing storage unit through the first and second spectrum analyzers connected to the output 0 of the first transverse vibration sensor, the input of the second spectrum analyzer is connected to the output of the longitudinal vibration sensor, and the outputs of the spectrum analyzers are connected to the inputs of the control unit, which is connected to the control inputs of the selective amplifiers.