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Reconstruction Method of Rotary Valve Speed ​​Control Pulse

A speed control, rotary valve technology, applied in earthwork drilling, surveying, wellbore/well components, etc., can solve problems such as unreported

Inactive Publication Date: 2018-03-09
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, how to obtain the synchronization signal simply and effectively, how to eliminate the influence of the phase error on the pulse reconstruction of the rotary valve speed control during the coherent demodulation of the drilling fluid pressure PSK signal, and what method to use to process the demodulated phase signal to realize the rotation The reconstruction of valve speed control pulse is a key technical problem that needs to be solved in the field of measurement while drilling / logging while drilling, but there are no reports about effective solutions and solutions in this regard

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  • Reconstruction Method of Rotary Valve Speed ​​Control Pulse
  • Reconstruction Method of Rotary Valve Speed ​​Control Pulse
  • Reconstruction Method of Rotary Valve Speed ​​Control Pulse

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0056] figure 1 Shown is an existing drilling device including measurement-while-drilling / logging-while-drilling tools and drilling fluid pressure signal detection and processing. The drilling fluid 1 in the drilling fluid tank 13 is injected into the drill string 3 drilled into the formation 7 through the drilling fluid pump 4 on the ground 2, reaches the drill bit 5 at the bottom of the drill string 3, and passes through the drill string 3 and the formation 7 after flowing out from the water hole of the drill bit. The annular space 6 between returns to the surface 2, and the arrow indicates the flow path of the drilling fluid.

[0057] Instruments are placed in the drill collar 12 close to the drill bit 5 in the drill string 3 , and the upper part of the drill collar is connected to the drill pipe to form a drill string. The entire drill string appli...

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Abstract

The invention provides a method for reconfiguring the rotational speed control pulse of a rotary valve. Drilling fluid pressure differential phase shift keying signal or drilling fluid pressure quadrature phase shift keying signal obtained from the wellhead pressure sensor, after signal processing to eliminate pump pressure interference and noise, through coherent demodulation and arc cosine operation, get the reflected drilling The phase signal of the carrier phase change during the hydraulic pressure differential phase shift keying modulation or the phase signal reflecting the carrier phase change of the drilling fluid pressure quadrature phase shift keying modulation. The rotation valve speed control pulse is re-adjusted by performing derivative operations on the phase signal. structure, and the reconstructed rotary valve speed control pulse is not affected by the phase error during coherent demodulation; according to the data encoding rules, the logical judgment is made on the reconstructed rotary valve speed control pulse amplitude to determine the symbol state represented by the pulse, according to The data codes are arranged in the time sequence of the pulses to realize the decoding of the drilling fluid pressure differential phase shift keying signal or the drilling fluid pressure quadrature phase shift keying signal.

Description

Technical field: [0001] The invention relates to a processing method of measurement-while-drilling / logging-while-drilling uploaded signals in the process of oil and gas drilling, and in particular to a method for reconstructing rotational speed control pulses of a rotary valve. Background technique: [0002] Downhole Measurement While Drilling / Logging While Drilling (MWD / LWD) is a modern drilling auxiliary technology that measures and transmits downhole information in real time during drilling. During the drilling process, the drilling fluid is pumped downhole from the ground through the drill string, sprayed out from the water hole of the drill bit for the lubrication and cooling of the drill bit, and returns upward to the wellhead through the annular space between the well wall and the drill string. MWD / LWD tools are installed Inside the drill collar at the top of the bit, see attached figure 1 . In MWD / LWD tools, sensors installed in the drill string near the drill bit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/12
Inventor 沈跃盛利民
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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