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Signal acquisition and storage device for VSP (Vertical Seismic Profiling) measurement while drilling

A signal acquisition and storage device technology, applied in the field of geophysical exploration, can solve the problems of inability to effectively and stably store downhole measurement data, difficult to use, etc., and achieve the effects of fast reading speed and stable storage performance

Active Publication Date: 2016-11-09
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 acquisition and storage device for VSP measurement while drilling

Method used

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  • Signal acquisition and storage device for VSP (Vertical Seismic Profiling) measurement while drilling
  • Signal acquisition and storage device for VSP (Vertical Seismic Profiling) measurement while drilling
  • Signal acquisition and storage device for VSP (Vertical Seismic Profiling) measurement while drilling

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Experimental program
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Effect test

Embodiment

[0036] 1. System structure

[0037] 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.

[0038]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

[0060] The working state STPUMP of the mud pump is automatically set by comparing the difference between AxRMS and AyRMS and Ath respectively.

[0061] AxRMS-Ath>0 or AyRMS-Ath>0

[0062] Then STPUMP=1 (turn on the pump); otherwise STPUMP=0 (turn off the pump).

[0063] Among them, AxRMS is the root mean square value of the X-axis vibration sensor, namely

[0064] Ax R M S = Σ i = 1 N ( A x i 256 ) 2 N = 1 ...

Embodiment approach 2

[0069] 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).

[0070] AxRMS is the root mean square value of the X-axis vibration sensor, that is

[0071] Ax R M S = Σ i = 1 N ( Axi H G H ) 2 N

[0072] Ay...

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Abstract

The invention relates to a signal acquisition and storage device for VSP (Vertical Seismic Profiling) measurement while drilling, which comprises a signal acquisition circuit and a data storage circuit, wherein the signal acquisition circuit comprises a sampling digital signal controller, an analog-to-digital converter, a detector, a sample buffer array and a hydrophone; the detector and the hydrophone are connected with the analog-to-digital converter via a differential amplifier respectively; the analog-to-digital converter and the sample buffer array are respectively connected with the sampling digital signal controller; the digital signal controller is connected with a clock module; and the data storage circuit comprises a storage data word signal controller, a storage chip array manager and a storage device array. The device of the invention has the following advantages that a high-temperature chip is adopted, the storage performance is stable, the reading speed is quick, and the storage capacity can meet storage space needed by a four-component VSP measurement tool while drilling for 200-hour continuous work.

Description

technical field [0001] The invention relates to a signal acquisition and storage device, which belongs to the technical field of geophysical exploration, and in particular to a signal acquisition and storage device 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 ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28G01V1/288G01V2210/48
Inventor 贾衡天艾维平彭烈新张连成彭浩管康
Owner BC P INC CHINA NAT PETROLEUM CORP
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