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A signal playback device and method for VSP measurement while drilling

A signal playback and while-drilling technology, applied in the field of geophysical exploration, can solve problems such as difficult to use, unable to effectively and stably store downhole measurement data, and achieve the effect of high-speed downloading

Active Publication Date: 2018-12-11
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 problem that existing storage devices in the prior art are affected by high temperature and high pressure, are difficult to be used in VSP measurement, and cannot effectively and stably store downhole measurement data and quickly download data after tripping out, and provide a Signal playback device and method for VSP measurement while drilling

Method used

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  • A signal playback device and method for VSP measurement while drilling
  • A signal playback device and method for VSP measurement while drilling
  • A signal playback device and method for VSP measurement while drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0053] 1. System structure

[0054] 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.

[0055] 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

[0077] The working state STPUMP of the mud pump is automatically set by comparing the difference between AxRMS and AyRMS and Ath respectively.

[0078] AxRMS-Ath>0 or AyRMS-Ath>0

[0079] Then STPUMP=1 (turn on the pump); otherwise STPUMP=0 (turn off the pump).

[0080] Among them, AxRMS is the root mean square value of the X-axis vibration sensor, namely

[0081]

[0082] AyRMS is the root mean square value of the Y-axis vibration sensor, that is

[0083]

[0084] 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

[0086] 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).

[0087] AxRMS is the root mean square value of the X-axis vibration sensor, that is

[0088]

[0089] AyRMS is the root mean square value of the Y-axis vibration sensor, that is

[0090]

[0091] 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, th...

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Abstract

The invention relates to a signal playback device and method and belongs to the technical field of geophysical exploration and specifically relates to the signal playback device and method for measuring a VSP while drilling. The signal playback device and method for measuring the VSP while drilling comprises an FPGA controller, a number of SRAMs, a USB controller, an SPI interface and a crystal oscillator, wherein the SPI interface is connected with a storage chip array manager via an SPI bus, the SRAMs are connected with the FPGA controller via a data bus and an address bus, and the USB controller and the crystal oscillator are respectively connected with the FPGA controller. The signal playback device and method are advantageous in that a USB to SPI interface circuit is used for directly reading data of a storage device via the SPI bus, no digital signal controller is needed to serve as a transit part, and therefore large volume VSP data can be downloaded at high speed.

Description

technical field [0001] The invention relates to a signal playback device and method, belonging to the technical field of geophysical exploration, in particular to a signal playback device 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 wells in this area by using the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042G01V1/40
CPCG01V1/40G05B19/042G05B2219/25257
Inventor 艾维平贾衡天吕海川曹冲张磊邓乐
Owner BC P INC CHINA NAT PETROLEUM CORP
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