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A time-sharing data carrying system and method for VSP measurement while drilling

A data carrying and data technology, applied in the field of geophysical exploration, can solve problems such as difficulties in the transmission of downhole measurement data, and achieve the effect of improving measurement accuracy

Active Publication Date: 2018-12-25
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly solves the technical problem of difficult downhole measurement data transmission existing in the prior art, and provides a time-sharing data carrying system and method for VSP measurement while drilling

Method used

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  • A time-sharing data carrying system and method for VSP measurement while drilling
  • A time-sharing data carrying system and method for VSP measurement while drilling
  • A time-sharing data carrying system and method for VSP measurement while drilling

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Experimental program
Comparison scheme
Effect test

Embodiment

[0042] 1. System structure

[0043] Such as figure 1As 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.

[0044] 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 waveform...

Embodiment approach 1

[0066] The working state STPUMP of the mud pump is automatically set by comparing the difference between AxRMS and AyRMS and Ath respectively.

[0067] AxRMS-Ath>0 or AyRMS-Ath>0

[0068] Then STPUMP=1 (turn on the pump); otherwise STPUMP=0 (turn off the pump).

[0069] Among them, AxRMS is the root mean square value of the X-axis vibration sensor, namely

[0070]

[0071] AyRMS is the root mean square value of the Y-axis vibration sensor, that is

[0072]

[0073] 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

[0075] 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).

[0076] AxRMS is the root mean square value of the X-axis vibration sensor, that is

[0077]

[0078] AyRMS is the root mean square value of the Y-axis vibration sensor, that is

[0079]

[0080] 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 Figure 6 As shown, the working frequency of the ground mud pump is about 1.5Hz, the ...

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Abstract

The invention relates to a data time-sharing carrying system and method, belongs to the technical field of geophysical exploration, and particularly relates to a data time-sharing carrying system and method for while-drilling VSP (Vertical Seismic Profiling) measurement. The data time-sharing carrying system comprises a carrying device and a VSP clamping base in abut joint with each other, wherein the carrying device comprises a floating cylinder, a control storage circuit as well as a carrying device coupling coil and a Hall sensor which are connected with the control storage circuit; the VSP clamping base is positioned on a VSP measurement tool body and comprises a VSP coupling coil matched with the carrying device coupling coil, and a magnet matched with the Hall sensor. Therefore, the data time-sharing carrying system has the advantages that firstly, downhole VSP data can be read in a time-sharing manner, and the advantage of real-time measurement of a while-drilling VSP system is maintained; secondly, precise time information can be carried to correct errors caused by an downhole VSP clock, and thus the measurement precision can be improved.

Description

technical field [0001] The invention relates to a data time-sharing carrying system and method, which belong to the technical field of geophysical exploration, and in particular to a data time-sharing carrying system and method for VSP measurement while drilling. Background technique [0002] With the increasing difficulty of oil and gas exploration and development, the application value of vertical seismic profiling (Vertical Seismic Profiling, VSP) measurement while drilling technology is becoming more and more prominent, especially its formation prospecting function, the detection range is much larger than other logging while drilling tools. Problems such as the precise positioning of carbonate caves in deep and ultra-deep wells and the jamming of high-pressure formations are still difficult to solve. For example, relevant data show that the first-time drilling success rate of karst caves in the Tabei area of ​​Tarim area is 59.5%, and the second positioning of failed wel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/26E21B47/12G04R20/04G04G7/00
CPCE21B47/00E21B47/12G04G7/00G04R20/04
Inventor 盛利民艾维平窦修荣王鹏吕海川张磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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