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A kind of drilling tool assembly and drilling technology for l-shaped ground pre-grouting drilling with a depth of one thousand meters

A drilling tool assembly and pre-grouting technology, which is applied in the field of mining machinery, can solve the problems of high rock powder up-return resistance, difficult tripping and drilling, and sticking, so as to improve drilling efficiency, improve construction quality, and improve drilling efficiency. Smooth track effect

Inactive Publication Date: 2018-01-19
SHANDONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention is to provide a drilling tool assembly and drilling technology for L-shaped ground pre-grouting drilling at a depth of one thousand meters, which not only meets the construction requirements of the ground pre-grouting drilling with modified ground in the horizontal roadway of a thousand-meter-deep shaft , which solves the problems of large back-up resistance of rock powder, difficulty in tripping, drill sticking and hole collapse when drilling to the horizontal orientation section, and reduces the stress and strain fatigue damage of drilling tools under the condition of drill pipe rotation

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  • A kind of drilling tool assembly and drilling technology for l-shaped ground pre-grouting drilling with a depth of one thousand meters
  • A kind of drilling tool assembly and drilling technology for l-shaped ground pre-grouting drilling with a depth of one thousand meters

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Embodiment Construction

[0026] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.

[0027] Take the L-shaped hole ground pre-grouting reinforcement project of the underground roadway in Xinhu Coal Mine, Guoyang County, Anhui Province as an example.

[0028] In this embodiment, a total of 3606m is drilled, including a total of 1806m in the deflection section and a total of 600m in the horizontal section. in:

[0029] (1) Drilling in straight hole section

[0030] When drilling open holes, the drilling tool assembly used includes Ф215.9mm roller cone bit, Ф159mm drill collar and Ф73mm short drill pipe; the drilling parameters are: drilling pressure 0.3~0.5t; drilling speed: 30~40r / min; Volume: 990L / min; when drilling, the drilling rig rotates slowly at low pressure, and circulates mud with a large displacement to ensure the verticality of the drilling hole.

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Abstract

The invention discloses a drilling tool assembly and a drilling process for a thousand-meter-deep L-shaped ground pre-grouting drilling, a thousand-meter-deep L-shaped ground pre-grouting drilling process, and a thousand-meter-deep L-shaped ground pre-grouting drill Hole drilling technology, including straight hole drilling, deflection section drilling and horizontal section drilling, deflection section drilling includes deflection section drilling with an inclination angle greater than 45° and deflection section drilling with a well inclination angle less than 45° Drilling in the inclined section; during the drilling of the building section, on the premise that the building rate meets the design requirements, replace the drilling tool assembly after drilling a single drill pipe length and drill 2m in combination; One vertical drill pipe or pure drilling for more than 24 hours, short tripping and drilling 10-15 vertical drill pipes. The invention satisfies the construction requirements of modified ground pre-grouting drilling in the horizontal roadway of a thousand-meter-deep wellbore, and solves the problems of large back-up resistance of rock powder, high difficulty in tripping and drilling, drill sticking and hole collapse when drilling to the horizontal directional section. problem, and reduce the stress and strain fatigue damage of the drilling tool under the condition of the drill pipe rotation.

Description

technical field [0001] The invention relates to the field of mining machinery, in particular to a drilling tool assembly and a drilling process for a thousand-meter-deep L-shaped ground pre-grouting drilling. Background technique [0002] The ground pre-grouting technology for modifying the surrounding rock of the thousand-meter-deep horizontal roadway refers to the use of high-precision drilling trajectory control technology to perform ground pre-grouting modification on the unstable and broken surrounding rock of the underground horizontal roadway through deep well horizontal grouting drilling. In order to enhance the integrity of the surrounding rock of the roadway, improve the mechanical properties of the surrounding rock, improve the overall stability of the surrounding rock mass of the relevant coal mine roadway and chamber, reduce the difficulty of roadway support, and ensure the safety of underground construction activities. [0003] The ground pre-grouting construct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B7/06
Inventor 田忠喜刘书杰王渭明刘业斌
Owner SHANDONG UNIV OF SCI & TECH
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