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Radioactive source bin and drill collar with same

A radioactive source and radioactive source technology, applied in the field of radioactive source bin structure, can solve the problems of not considering the radioactivity through the mud flow channel, increase the measurement error, etc., and achieve the reasonable design of the instrument structure, the improvement of the measurement accuracy, and the increase of the safety of use. Effect

Active Publication Date: 2014-12-10
CHINA PETROLEUM & CHEM CORP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]In density logging while drilling, the radioactive source is separated from the shield at present, and the radioactive source is directly placed on the drill collar. The radioactive source and the detection The shielding block is wedged between the detectors to prevent the radiation from directly entering the detector without passing through the formation, resulting in a large measurement error
The radioactive source chamber with this structure does not consider the radioactivity passing through the mud flow channel, and the measurement error will increase due to the design of no collimation holes around the radioactive source

Method used

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  • Radioactive source bin and drill collar with same
  • Radioactive source bin and drill collar with same
  • Radioactive source bin and drill collar with same

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1, compared with attached figure 2 and 3 , the radioactive source chamber includes the matrix (the lower part of the matrix here is image 3 In the drill collar 1, the upper part of the substrate is figure 2 Central centralizing wing 7 (that is, the joint between the main body of the drill collar and the centralizing wing), the radioactive source chamber 4 and the shielding body chamber 5 distributed in the matrix, and the shielding body chamber 5 has a high-density shielding body. The radioactive source chamber 4 is a stepped circular hole, which includes a radial hole 8, a threaded hole 9, a sealing groove 10, and a ring groove 11 from the inside to the outside. The shield bin 5 is a cup-shaped groove covering the periphery of the radial hole 8 of the radioactive source chamber. A high-density shield is embedded in the cup-shaped groove, and the outer end of the shield is blocked by a block 12 . A low-density window 13 is engraved radially on the shiel...

Embodiment 2

[0017] Embodiment 2, contrast figure 1 , a drill collar with the aforementioned radioactive source chamber, the drill collar 1 adopts the existing structure, its two ends are upper and lower joints, and there is a mud flow channel 2 in the middle. The mud circulates to the bottom of the well in the mud channel 2, flows out through the water hole of the drill bit, and then returns to the wellhead through the annular space between the drill collar and the formation. Mud not only carries cuttings, but also serves as a transmission medium for downhole signals, and the density measurement value is transmitted to the ground through MWD using mud as a carrier. combined with figure 2 , there are three righting wings 7 outside the middle of the drill collar. One of the righting wings 7 is provided with a groove, and the outside of the groove cooperates with the cover plate to form a closed chamber 3, and the density detector is placed therein. On the same righting wing, there is a ...

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Abstract

The invention relates a radioactive source bin which comprises a basal body and a radioactive source chamber and a shielding body bin which are distributed in the basal body, wherein the shielding body bin is internally provided with a high density shielding body; the radioactive source chamber is a step-type round hole, and the shielding body bin is a cup-shaped groove which is covered on the periphery of a radial hole of the radioactive source chamber; and the high density shielding body is nested in the cup-shaped groove, the outer end part of the shielding body is plugged by a plugging block, a low density window is engraved on the shielding body in radial direction, and the window is communicated with an alignment hole in the basal body. The invention also relates to a drill collar with the radioactive source bin, the middle of the drill collar is provided with more than two righting wings, one of the righting wings is provided with a groove, and the exterior of the groove and a cover plate are cooperated to form a closed bin; and the radioactive source bin approaches to one side of the closed bin, and the alignment hole of the bin inclines to one side of the closed bin. The radioactive source bin and the drill collar provided by the invention have the advantages that a radioactive source can not drop off all the same even if in the harsh drilling environment, the use is safe and reliable and the measuring accuracy is high.

Description

Technical field: [0001] The invention relates to a radioactive source chamber structure of a geophysical exploration device and a drill collar with the source chamber structure. Background technique: [0002] The density measuring instrument used in geophysical exploration is a logging instrument that irradiates the formation with gamma rays emitted by a radioactive gamma source, and measures the volume density of the formation according to the Compton effect, thereby calculating the porosity of the formation around the wellbore. The commonly used radioactive source is a 2 Curie gamma source, which has serious damage to the human body and the environment, so the safe use of radioactive sources is extremely important. [0003] In density logging while drilling, the radioactive source is separated from the shielding body at present, and the radioactive source is directly placed on the drill collar, and a shielding block is wedged between the radioactive source and the detector...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/16G01V5/12
Inventor 施斌全亢武臣崔海波肖红兵张海花李勇华
Owner CHINA PETROLEUM & CHEM CORP