Device and method for calibrating orientational double-gamma instrument balance
An instrument and azimuth technology, applied in the field of dual gamma instrument balance calibration of azimuth while drilling, can solve the problem that the sensitivity of sensors will not be completely consistent, and achieve the effect of eliminating influence, universal comparability, and uniform response
Active Publication Date: 2014-06-04
上海神开石油测控技术有限公司 +3
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Problems solved by technology
However, even if the production conditions and processing technology are exactly the same, the sensitivity of the two sensors finally assembled on the instrument will not be exactly the same.
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[0058] The specific embodiments of the present invention will be described below in conjunction with the drawings.
[0059] The balance calibration device and method of the present invention are used for figure 1 The azimuth dual gamma instrument 300 shown performs correction. In the outer wall 350 of the azimuth dual gamma instrument 300, a sensor for gamma detection (hereinafter also referred to as the first sensor 310 and the second sensor 320) is designed at a position relative to 180°. These two sensors An azimuth shielding layer 330 is correspondingly provided at the position of the water eye 340 in between.
[0060] See also figure 2 , image 3 As shown, the balance calibration device of the present invention includes a calibration tank ( figure 2 ), and a rear shield 102 ( image 3 ). The calibration tank main body 101 is cylindrical, which can be split into two symmetrical semi-cylinders; each semi-cylinder is formed as an independent sub-tank 10.
[0061] Such as figur...
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The invention relates to a device and a method for calibrating orientational double-gamma instrument balance and provides a rear shielding case and a calibrating tank capable of being detached in half. An instrument to be calibrated is placed in a shielding space formed by connecting the rear shielding case and a sub-tank body, and a first sensor and a second sensor which are arranged in a 180-degree opposite mode in the instrument are respectively close to one side of the sub-tank body and measured under the radioactive action of a homogenous calibration material. Therefore, sensitivity normalization of the instrument is calibrated, the instrument can be further placed in an another space formed by connecting two sub-tank bodies on a complete calibrating tank body so as to eliminate radioactivity influence of stratum on one side of the instrument to measurement of the sensors on the other side of the instrument, and conventional accurate position indicator (API) calibration can be performed. Thus, the whole performance of the calibrated instrument and response of a single sensor can both be unified, and total measurement results or some component values obtained by the instrument has general comparability.
Description
Technical field [0001] The invention relates to a calibration device and a calibration method of a logging instrument, in particular to a device and a method for the balance calibration of an azimuth double gamma instrument while drilling. Background technique [0002] Different types of formations have different natural radioactive intensities. The traditional single-probe gamma instrument only gives the average value of the radioactivity around the instrument. The azimuth dual gamma instrument can distinguish the difference in radioactivity on both sides of the instrument, and provides an effective means for finding the formation boundary in time for logging while drilling. [0003] figure 1 The azimuth-while-drilling dual gamma instrument 300 shown is connected to the inner wall of the drill collar 400 through the outer wall 350 of the instrument; a sensor for gamma detection is designed at a position relative to 180° in the outer wall 350, one of the two sensors An azimuth sh...
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IPC IPC(8): E21B49/00
Inventor 毕东杰吴大囡
Owner 上海神开石油测控技术有限公司