Continuous natural gamma logging while drilling instrument and logging method thereof

Abstract

The invention discloses a continuous natural gamma logging while drilling instrument and a logging method thereof. The continuous natural gamma logging while drilling instrument is mainly composed of four parts, i.e., a rock debris collector, a natural gamma sensor, an access integrated logging instrument and natural gamma signal acquisition software, wherein the rock debris collector is designed according to onsite well conditions and project design requirements and realizes rock debris quantitative continuous collection and automatic updating functions so as to enable the natural gamma sensor to perform continuous measurement on underground rock debris. According to the invention, real-time detection is performed through the natural gamma sensor, detection signals are input to the integrated logging instrument, lag depth correction and data acquisition processing are carried out, a real-time curve and real-time data can be output, a reference basis is provided for geological technical personnel in lithology identification, stratum comparison and horizon sticking work, and the exploration efficiency is improved.

Description

technical field [0001] The invention relates to a mud logging instrument and a mud logging method thereof, in particular to a drilling-while-drilling continuous natural gamma mud logging apparatus and a mud logging method thereof. Background technique [0002] At present, the existing measurement method is that mud logging staff use manual methods to measure the natural gamma of cuttings, and manually place the cuttings one by one in special measuring equipment for natural gamma radioactivity detection, and input the detected data into the computer. Data processing is performed to form a real-time natural gamma curve reflecting lithology. This measurement method needs to be carried out package by package, the workload is heavy, and the steps are cumbersome. Although the measured data is comparable, due to manual reasons, there will be data lag, or the depth correction is not accurate enough. [0003] One measurement method is wireless logging while drilling. The sensor is p...

AI Technical Summary

Problems solved by technology

This measurement method needs to be carried out package by package, the workload is heavy, and the steps are cumbersome. Although the measured data is comparable, due to manual reasons, there will be data lag, or the depth correction is not accurate enough.

[0003] One measurement method is wireless logging while drilling. The sensor is placed near the drill bit to detect the natural gamma signal of the formation. Through the acquisition and transmission of mud pulse signals, it is transmitted to the surface for data processing. The main function is geosteering and rapid identification. Lithology, the logging method uses mud pulse data acquisition and transmission, which is greatly affected by working conditions, and the bit error rate of the transmission signal is high. In addition, the equipment while drilling is expensive, and only key exploration wells and horizontal wells use this method. to a wide range of applications

[0004] The other is to place the sensor in the mud tank for measurement. During the circulation of the mud, the broken cuttings are brought to the ground and enter the vibrating screen through the mud tank channel. The sensor measures the natural gamma signal of the cuttings in the mud tank. The mud tank The content of cuttings is small, which is greatly affected by drilling, the range of numerical value is small, and the reference of the measured data is poor;

[0005] Another mud logging method is to collect cuttings through the vibrating screen. The cuttings are compressed, and then the cuttings natural gamma signal is collected, and the output is transmitted through the network 3G signal. The process is slightly complicated; the data is output by 3G signal , although it can meet the requirements of most wells, but in the case of poor offshore signals, data transmission cannot be realized; the special equipment for data reception cannot achieve a perfect connection with the comprehensive mud logging unit, and data depth correction requires a certain amount of work

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