Scanning type radioactive hole diameter measurement device and method

A technology of well diameter measurement and radioactivity, which is applied in measurement devices, geophysical measurement, and nuclear radiation exploration, etc., can solve the problems of heavy instrument weight and complex structure, and achieve large calculation range and accuracy of well diameter and high imaging quality. , the effect of improving the accuracy

Active Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Among them, when the contact mechanical multi-arm caliper measuring instrument is used for logging, the measuring arms in each direction are mechanically displaced according to the change of the caliper, and the caliper data is transmitted to the ground by the cable for recording, realizing multi-directional caliper measurement. The instrument is heavy and relatively complex in structure

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  • Scanning type radioactive hole diameter measurement device and method
  • Scanning type radioactive hole diameter measurement device and method
  • Scanning type radioactive hole diameter measurement device and method

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Embodiment Construction

[0060] The invention discloses a scanning radioactive borehole diameter measurement method and equipment, which selects a gamma radiation source, sets a plurality of collimation holes at the gamma radiation source, and correspondingly a plurality of near and far gamma detectors record scattering Gamma counting: Gamma counting is the result of the weighted average effect of mud density and formation density, based on the fact that the contribution of mud to detector gamma counting is related to the mud gap, and there is a nonlinear relationship between the two; Gamma counting in various azimuths at different depths along the wellbore forms a method for quantitatively evaluating the size of the wellbore. By setting multiple sets of collimation hole-detector combinations, the statistical error of gamma counting is reduced, and the accuracy of azimuth caliper data is improved; the equipment performs measurements in the form of rotary scanning in the downhole, and records the azimut...

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Abstract

The invention discloses a scanning type radioactive hole diameter measurement device and method. A gamma radiation source is adopted, a plurality of collimation holes are formed at the gamma radiation source, and scattering gamma counts are recorded by a plurality of corresponding close and far gamma detectors; according to the fact that the gamma count is a result of weighted average of mud density and stratum density, and on the basis that a contribution rate of mud to the gamma counts of the detectors is related to the mud gaps, a nonlinear relation is formed therebetween; and a quantitative evaluation method of a hole diameter is formed by adoption of the gamma counts on all directions at different depths along a borehole recorded by the gamma detectors. As the combination of multiple groups of collimation holes-detectors is arranged, the statistical errors of the gamma counts are reduced, and the accuracy of the hole diameter data on the directions is improved; and the device performs measurements underground in a rotary scanning manner and records the hole diameter data in all directions at different depths underground for imaging and displaying the hole diameter.

Description

technical field [0001] The invention relates to a well logging device for measuring borehole diameter by nuclear radiation method and a borehole diameter measuring method based on the measuring equipment, belonging to the technical field of mine geophysics logging. Background technique [0002] With the deepening of exploration and development of oil and gas fields, the accurate description of oil and gas reservoirs and reservoir parameters is the key to formulating oil and gas field development plans to improve recovery and oil and gas production, and geophysical logging is the main technology to directly determine the formation parameters. Radius logging data is an important basis for in-situ stress analysis, real-time drilling monitoring, completion cement volume estimation, logging curve correction, borehole scour evaluation, and storage division. [0003] At present, the caliper measurement methods and equipment mainly include mechanical multi-arm caliper logging and no...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/04
CPCG01V5/04
Inventor 刘军涛吴赫张锋张泉滢邱飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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