A drilling tool state detection method and device for vsp measurement while drilling
A state detection and drilling tool technology, applied in the field of geophysical exploration, can solve the problems of multi-machine time, complicated methods, and poor coupling effect, and achieve the effects of improving measurement accuracy, simple judgment methods, and ensuring reliability.
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[0058] 1. System structure
[0059] Such as figure 1 As shown, the four-component VSP measurement system while drilling proposed by the present invention is mainly composed of a ground seismic source, a VSP downhole measurement tool, a data carrier, a ground clock synchronization device, and a data processing system. Among them, the downhole VSP measurement tool consists of three detector arrays distributed in X, Y and Z axes, two hydrophones, signal measurement circuit, data acquisition and storage circuit, signal receiving and transmitting circuit, system power monitoring circuit, data It is composed of high-speed download interface and battery cartridge. Downhole VSP measurement system such as image 3 shown.
[0060] The downhole VSP measurement tool is an important core part of the entire measurement system. Its function is to collect seismic wave signals received downhole and automatically extract the first arrival time (check shot time), and store the seismic wavefor...
Embodiment approach 1
[0082] The working state STPUMP of the mud pump is automatically set by comparing the difference between AxRMS and AyRMS and Ath respectively.
[0083] AxRMS-Ath>0 or AyRMS-Ath>0
[0084]Then STPUMP=1 (turn on the pump); otherwise STPUMP=0 (turn off the pump).
[0085] Among them, AxRMS is the root mean square value of the X-axis vibration sensor, namely
[0086]
[0087] AyRMS is the root mean square value of the Y-axis vibration sensor, that is
[0088]
[0089] Ath is the artificially set comparison threshold (obtained through experiments), Axi is the AD sampling value (two-byte signed integer) of the vibration sensor on the X-axis (channel 0) after high-pass filtering, and Ayi is the Y-axis (channel 0) after high-pass filtering 1) Vibration sensor AD sampling value (two-byte signed integer). N is the average number of times (preliminarily set to 256), and memory space (2×256 words) needs to be opened up according to the number of filtering channels and N.
Embodiment approach 2
[0091] Because Axi (or Ayi) is a two-byte signed integer, and the result of Axi÷256 (or Ayi÷256) is actually to take the high byte of Axi (or Ayi) (respectively recorded as AxiHGH and AyiHGH), In this way, the storage space that needs to be opened up can be reduced by half (2*256 bytes).
[0092] AxRMS is the root mean square value of the X-axis vibration sensor, that is
[0093]
[0094] AyRMS is the root mean square value of the Y-axis vibration sensor, that is
[0095]
[0096] The vibration reduction of the circuit board and the attenuation of the high-pass filter cause AxiHGH and AyiHGH to always be 0 (that is, the dynamic acceleration value is always less than 1g). At this time, the automatic judgment may fail, and it needs to be verified by experiments. The test method for detecting the state of the drilling tool has been tested and verified, and the actual results are as follows Image 6 As shown, the working frequency of the ground mud pump is about 1.5Hz, the...
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