Differential positioning seismometer while drilling

Abstract

The invention aims to provide a differential positioning seismometer while drilling to meet requirements while drilling. In the drilling process, the seismometer uses a geophone to measure seismic reflection waves generated when a drilling bit impacts a stratum and convert the measured seismic waves into digital signals which are combined with position information generated by a differential positioning system, time information generated by a high-precision GPS timing system and geophone vertical information generated by an inclination angle sensor to form seismic data in the drilling process, and a drilling well field wireless local area network consisting of data transmission modules realizes the high-speed real-time transmission of the data. The differential positioning seismometer can acquire the seismic waves of fixed points and fixed times in a seismic system while drilling in real time without lagging and realize high-precision differential positioning of collection points; a computer in a monitoring center can realize measuring line display, accurately calculate the track pitch and the offset distance and reduce the seismic interpretation errors; and simultaneously, the inclination angle sensor monitors the inclination angle changes of the seismometer in real time.

Description

technical field [0001] The invention is aimed at the development of new technology of exploration while drilling in the field of seismic exploration, and is also applicable to the fields of petroleum, geology, coal and other exploration fields. It is based on a high-precision differential positioning system and can realize a new generation of high-performance real-time seismic with virtual survey lines. data collection system. Background technique [0002] Vertical seismic profiling (VSP) is an effective method of side-hole seismic exploration. In order to obtain the vertical seismic profile near the well, the drilling process needs to be interrupted during VSP data acquisition, and a downhole geophone is placed in the well, and the measurement is carried out by exciting the ground source. Because of the risks associated with operating in an open hole, VSP measurements are usually performed after cementing. VSP measurement is carried out when drilling reaches a certain sta...

AI Technical Summary

Problems solved by technology

[0005] The analog and digital components of most of the seismic recording systems in the prior art are designed separately, and external wiring is required to connect the analog components of one or several units of the geophone with the digital recording unit and the telemetry component, which brings many problems to the construction site. inconvenient

The operation of the digital recording unit and the telemetry unit and the seismic sensors are pre-programmed and cannot be controlled and monitored in real time

[0006] Ordinary seismographs design the location of the geophone group through experiments before exploration, and calculate the corresponding track spacing and offset distance. The offset cannot be guaranteed to be consistent with the calculated value, and the error of trace spacing directly affects the interpretation work of seismic while drilling

In addition, the dip angle change of the geophone group is also an important factor affecting the accuracy of seismic exploration, and the current seismograph cannot realize real-time monitoring of this information

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