Using natural gamma instruments, it is possible to determine the current geological formation and whether it has entered or left the oil and gas reservoir. Natural gamma can determine whether it has left the oil and gas reservoir, but cannot accurately determine whether it has left from above or below.

The directional gamma instrument can detect the amount of natural gamma in different directions. By interpreting the changes in gamma data in different directions, it can determine which direction the instrument is leaving or will leave the reservoir. The directional personnel can process it in a timely manner and return to the reservoir.

In real-time drilling, directional gamma can record gamma data of eight different sectors of the formation. After drilling, trajectory imaging maps can be generated. Through imaging data, formation fault information and dip angle information can also be fed back, which is of great reference significance for a comprehensive understanding of the formation.

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1. Central azimuth gamma

2. Drill collar azimuth gamma (imaging gamma)

GS AziGR: Center azimuth gamma

GS ImgGR: Drill collar azimuth gamma (imaging gamma)

GS AziGR is used in multiple directional and horizontal wells in the Yanchang area of northern Shaanxi. During the window entry stage, it can truly reflect that the lower part of the instrument enters the window first and then the upper part enters the window; During the instrument drilling process, the instrument is located at a deeper position in the reservoir, and the azimuth gamma display shows the average gamma data of each sector; When deviating from the reservoir, it is possible to distinguish which direction the deviation is from based on the difference in the trend of gamma data changes, and thus adopt the correct adjustment method to return to the reservoir.

GS AziGR will continuously optimize its algorithm and gradually expand its usage in horizontal and directional well operations.

I believe that the usage rate of gamma rays in the future will continue to increase.