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Guide hole drilling method used under poor geological conditions

A geological condition and pilot hole technology, applied in drilling equipment and methods, chemical instruments and methods, drilling equipment, etc., can solve the problems of high cost, slow speed, long construction period, etc., and achieve short construction period and fast drilling speed , The effect of low construction cost

Pending Publication Date: 2019-11-05
SINOHYDRO BUREAU 6 CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention discloses a pilot hole drilling method under unfavorable geological conditions to at least solve the problems of high cost, slow speed and long construction period in the existing pilot hole drilling method

Method used

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Embodiment Construction

[0019] The present invention will be further explained below in conjunction with specific embodiments, but it is not intended to limit the protection scope of the present invention.

[0020] In order to solve the problems of high cost, slow speed and long construction period in the existing pilot hole drilling method, this embodiment provides a new pilot hole drilling method, which is especially suitable for working conditions in bad geological conditions. The pilot hole drilling method specifically comprises the steps:

[0021] 1) Drilling: After fixing the raise drilling rig at the wellhead, install the drilling rod and pilot bit, use the stabilizer to accurately position the drilling rod and fix it firmly, and then carry out the drilling operation, among which , after positioning the drill pipe for the hole through the stabilizer, the stability of the drill pipe for the hole can be improved, and the pilot hole drill bit is prevented from being hindered by the rock formation...

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Abstract

The invention discloses a guide hole drilling method used under poor geological conditions. According to the method, a raise boring machine is adopted for guide hole drilling, the whole guide hole drilling comprises steps of opening and guide hole drilling, wherein in order to guarantee guide hole drilling quality and increase the drilling speed in the guide hole drilling process, a stabilizing drill rod is utilized during guide hole drilling, diameter of the stabilizing drill rod is the same as that of a guide hole drill bit, so that the stabilizing drill rod can tightly squeeze the side wallof a guide hole in a drilling process, deviation caused by shaking of the guide hole drill bit in the drilling process is prevented, and the drilling speed is increased while the guide hole drillingquality is guaranteed. Under the poor geological conditions, drilling slurry is pumped into the drill hole, drilling can be continued under protection of the drilling slurry, progress of the guide hole drilling is not affected, and the method has the advantages of low construction cost, high drilling speed, short construction period and the like.

Description

technical field [0001] The invention discloses the technical field of inclined shaft construction, in particular to a pilot hole drilling method under adverse geological conditions. Background technique [0002] At present, when a raise drilling rig is used to conduct pilot hole drilling in unfavorable geological formations, once encountering unfavorable geological formations such as faults, cracks, dissolved trenches, dissolved troughs or weak interlayers, the drill pipe will be affected by the real-time geological formations, and the pilot hole will appear. The phenomenon of hole deflection occurs, causing the pilot hole to deviate from the original design axis, and the pilot hole drilling cannot continue. [0003] In the prior art, when encountering the above-mentioned unfavorable geological strata, the method of grouting is generally used for processing. Specifically, cement slurry or cement mortar with a water-cement ratio of 0.4 to 0.55 is mixed, consolidated and grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/00E21B7/04C09K8/00
CPCC09K8/00E21B7/00E21B7/04
Inventor 叶明侯建德何金星蒋洪亮
Owner SINOHYDRO BUREAU 6 CO LTD
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