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Four-component VSP (vertical seismic profiling) while-drilling measurement system and method

A measurement-while-drilling, four-component technology, applied in the field of geophysical exploration, can solve problems such as low detection accuracy, poor coupling effect of three-component geophones, and inability to effectively predict calibration shots, and achieve the effect of preventing strong vibration and impact

Active Publication Date: 2016-11-23
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

[0008] The present invention mainly solves the technical problems existing in the prior art that in vertical wells and cased wells, three-component geophones cannot effectively predict the use of calibration shot records due to their poor coupling effect and low detection accuracy, and propose a Four-component VSP measurement-while-drilling system and method

Method used

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  • Four-component VSP (vertical seismic profiling) while-drilling measurement system and method
  • Four-component VSP (vertical seismic profiling) while-drilling measurement system and method
  • Four-component VSP (vertical seismic profiling) while-drilling measurement system and method

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Experimental program
Comparison scheme
Effect test

Embodiment

[0051] 1. System structure

[0052] 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 geophone arrays distributed in the X, Y, and Z axes, two hydrophones, signal measurement circuits, data acquisition and storage circuits, signal receiving and transmitting circuits, system power monitoring circuits, and data It is composed of high-speed download interface and battery canister. Underground VSP measurement system such as image 3 Shown.

[0053] The downhole VSP measurement tool is an important core part of the entire measurement system. Its function is to collect the seismic wave signals received downhole and automatically extract the first arrival time (check shot time), and save the seis...

Embodiment approach 1

[0078] The working state STPUMP of the mud pump is automatically set by comparing the difference between AxRMS and AyRMS and Ath respectively.

[0079] AxRMS-Ath>0 or AyRMS-Ath>0

[0080] Then STPUMP=1 (open the pump); otherwise STPUMP=0 (close the pump).

[0081] Among them, AxRMS is the root mean square value of the X-axis vibration sensor, namely

[0082] Ax R M S = X i = 1 N ( A x i 256 ) 2 N = 1 256 X i = 1 N ( A x i ) 2 N

[0083] AyRMS is the root mean square value of the Y-axis vibration sensor, namely

[0084] Ay R M S = X i = 1 N ( A y i 256 ) 2 N = 1 256 X i = 1 N ( A y i ) 2 N

[0085] Ath is the artificially set comparison threshold (obtained by experiment), Axi is the AD sampling value of the vibration sensor on the X axis (channel 0) after high-pass filtering ...

Embodiment approach 2

[0087] Because Axi (or Ayi) is a two-byte signed integer number, and the result of Axi÷256 (or Ayi÷256) is actually to take the high byte of Axi (or Ayi) (denoted as AxiHGH and AyiHGH, respectively), The storage space that needs to be opened up can be reduced by half (2×256 bytes).

[0088] AxRMS is the root mean square value of the X-axis vibration sensor, namely

[0089] Ax R M S = X i = 1 N ( Axi H G H ) 2 N

[0090] AyRMS is the root mean square value of the Y-axis vibration sensor, namely

[0091] Ay R M S = X i = 1 N ( Ayi H G H ) 2 N

[0092] The damping 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 be invalid, and it needs to be verified by experiment. Test verification of the described dril...

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Abstract

The invention relates to a four-component VSP (vertical seismic profiling) while-drilling measurement system and method. The four-component VSP while-drilling measurement system comprises a seismic source and a VSP underground measurement tool, wherein the VSP underground measurement tool comprises a first hydrophone, a second hydrophone, an X-direction wave detector, a Y-direction wave detector, a Z-direction wave detector, push block inner mould cavities and a precision clock assembly; the first hydrophone and the second hydrophone are arranged at a distance interval L in the depth direction; the X-direction wave detector, the Y-direction wave detector and the Z-direction wave detector are distributed in the X, Y and Z axial directions respectively; the push block inner mould cavities are used for containing the wave detectors and can push out and withdraw the wave detectors under the control of a control circuit; the precision clock assembly is used for performing clock synchronization with a ground clock synchronizing device. Therefore, the four-component VSP while-drilling measurement system has the advantages as follows: through the three axial wave detectors, longitudinal and transverse waves of a seism are measured at the same time, and seismic signals received by the two hydrophones are non-directional, so that data processing can be quickly analyzed quantitatively, and the current seismic velocity and direct wave and reflected wave are calculated for wave field separation.

Description

Technical field [0001] The invention relates to a measurement while drilling system and method, belonging to the technical field of geophysical exploration, and in particular to a four-component VSP measurement while drilling system and method. Background technique [0002] With the increasing difficulty of oil and gas exploration and development, the application value of Vertical Seismic Profiling (VSP) measurement while drilling technology has become increasingly prominent, especially its formation probing function, and the detection range is much larger than other logging while drilling tools. Problems such as precise positioning of carbonate caves in deep and ultra-deep wells and jamming of high-pressure formations are still difficult to solve. For example, relevant data show that the success rate of the first drilling of karst caves in the Tabei area of ​​the Tarim area is 59.5%. Using the VSP tool while drilling to locate the failed wells in this area can increase the drill...

Claims

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Application Information

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IPC IPC(8): G01V1/42G01V1/52
CPCG01V1/42G01V1/52
Inventor 刘岩生盛利民艾维平蔡志东贾衡天张庆红张磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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