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A method for detecting fault occurrence by single-hole jet

A fault and jet technology, applied in the field of fault advance exploration based on radial jet technology, can solve the problem that a single hole cannot determine the fault occurrence and location, and achieve the effect of wide coverage, strong adaptability and less drilling engineering.

Active Publication Date: 2019-07-05
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the technical problem that the occurrence and location of faults could not be determined in a single hole

Method used

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  • A method for detecting fault occurrence by single-hole jet
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  • A method for detecting fault occurrence by single-hole jet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for detecting the occurrence of faults with a single-hole jet. The implementation steps of the method are:

[0039] Step 1: Construct a straight hole on the ground above the position where the fault may develop. Casing is required to be installed in the alluvium section, and the hole diameter of the bare hole section shall not be less than Φ127mm. After the construction of the straight hole section is completed, the drilling rig cooperates with the radial jet construction.

[0040] Step 2: Arrange jet holes in Austrian limestone and sandstone according to the exploration results of the straight hole section. The jet position in the Austrian ash is 15m lower than the top surface of the Austrian ash. According to the relative position relationship between the straight hole section and the fault, the radial jet hole depth and jet azimuth are designed.

[0041] Step 3: According to the expected columnar shape of the jet flow, carry out the design of the jet flo...

specific Embodiment

[0051] There are many faults in the 3D seismic exploration and interpretation area of ​​a mine in Xingtai, Hebei, some of which have large fault throws, and geophysical prospecting shows that some faults have good water content and good vertical conductivity, and the mining area goes uphill mainly through large faults. The single-hole jet method was used to detect the occurrence of faults in front of the uphill roadway excavation before the uphill roadway excavation.

[0052] Step 1: Construction of the straight hole section on the ground

[0053] The drilling volume of this hole is 259.90m. The loose layer is drilled without core, and the bedrock section is drilled with core. The thickness of the alluvial layer is 177.35m, and the final hole enters Austrian ash 22.10m.

[0054] The hole diameter of the first hole is Φ245mm, drilled to 183.2m, and run into Φ219 casing. The diameter of the second opening is Φ180mm, and the F35 fault was encountered when drilling to 225.41m. ...

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PUM

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Abstract

The invention relates to a fault advance detection method based on radial jet technology. Including: step 1, constructing straight holes on the ground, and conducting preliminary investigation and confirmation of the fault development position; step 2, designing radial jet holes based on the exploration results, and drawing the expected stratum profile of each jet hole; step 3, carrying out Radial jet construction process design; step 4, construct each radial jet hole to the design position, and determine the breakpoint position of the jet hole; step 5, calculate the fault occurrence according to the break point parameters of the straight hole and each jet hole, and determine the roadway exposed fault position . This method has less drilling engineering volume, low engineering cost, wide coverage and strong adaptability, and has more advantages in the advanced exploration of roadways passing through faults.

Description

technical field [0001] The invention relates to an advanced detection method, which belongs to the technical field of mine geology, in particular to a fault advanced detection method based on radial jet technology. Background technique [0002] The fault in front of the coal mine roadway has a great influence on the excavation work. The occurrence and location of the fault restrict the layout of the shaft and roadway system and affect the safety of the mine. Finding out the occurrence and location of the fault can provide a basis for the layout of the mine and roadway, and after taking effective control measures in advance to block the water-conducting channel of the fault, the safety of roadway excavation can be guaranteed. [0003] At present, the main means of detecting faults are geological survey, drilling, geophysical prospecting, roadway prospecting and other methods. Drilling is an important means of geological structure exploration in coalfields, and usually three ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 南生辉刘再斌胡宝玉李凯
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP