Vibratory drag reduction method of drill column for directional drilling of approximate horizontal long drill holes of underground coal mine

A technology of directional drilling and long drilling, used in directional drilling, vibration drilling, vibration generating devices, etc., can solve the problems of poor trajectory controllability and rapid wear of the drill bit, so as to reduce the feeding force and drill string. The effect of friction and safety improvement

Active Publication Date: 2018-11-30
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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AI Technical Summary

Problems solved by technology

Although the composite drilling process can reduce friction, there are problems such as rapid wear of the drill bit in hard rock and poor track controllability.

Method used

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  • Vibratory drag reduction method of drill column for directional drilling of approximate horizontal long drill holes of underground coal mine
  • Vibratory drag reduction method of drill column for directional drilling of approximate horizontal long drill holes of underground coal mine
  • Vibratory drag reduction method of drill column for directional drilling of approximate horizontal long drill holes of underground coal mine

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Embodiment Construction

[0028] see figure 1 and 2 , shows the communicable vibration generator used in the method for reducing vibration and drag of the drill string for near-horizontal long boreholes in underground coal mines according to the present invention.

[0029] The communicable vibration generator includes an upper communication handle 1, an upper transition handle 2, a vibration nipple ( figure 2 ), a flexible communication line 3, a lower transition handle 8 and a lower communication handle 9, the upper communication handle 1 and the lower communication handle 9 are connected with the cable drill pipe for directional drilling in the coal mine underground, and the structure and principle are the same as those of the mature coal mine underground The cable drill pipe is the same, so I won’t go into details here. The upper transition joint 2 is connected to the upper communication joint 1 and the vibration joint, the lower transition joint 8 is connected to the vibration joint and the lower...

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Abstract

A vibratory drag reduction method of a drill column for directional drilling of approximate horizontal long drill holes of an underground coal mine comprises a conventional directional drilling, vibration generator installing position determination, vibratory drag reduction drilling construction method and the like. The size and material of the drill column are determined by (omitting) a vibrationgenerator installing position and according to a excitation force amplitude value, a front portion is caused, a rear portion drill column is driven to vibrate, meanwhile the stress waves produced invibration are transferred to an instrument for measurement while drilling and disappear in front of a hole bottom drill, and normal use of the instrument for measurement while drilling and the hole bottom drill is not affected. Therefore, a vibration function of the drill column during directional drilling of deep holes of the underground coal mine is achieved, a static friction force is convertedinto a movable friction force, buckling deformation of the drill column can be effectively decreased, accordingly the drilling friction resistance is remarkably decreased, signal transmission with existing mature cabled communication drill rods can be achieved, and the vibratory drag reduction method has the great significance in improvement of directional drilling depth and directional drillingefficiency of deep holes.

Description

technical field [0001] The invention relates to the technical field of underground drilling in coal mines, in particular to a method for reducing vibration and drag of drill strings for directional drilling in underground long near-horizontal drilling holes in coal mines. Background technique [0002] At present, during the sliding directional drilling process of coal mines in my country, the friction between the drill string and the hole wall is static friction. When the hole depth reaches a certain depth, the problem of friction accumulation and friction is prominent, resulting in the ineffective transmission of drilling pressure to the drill bit. , resulting in back pressure effect, which causes the drilling efficiency of deep hole drilling to be greatly reduced, and restricts the drilling depth under the sliding drilling mode. With the increasing application of directional drilling technology in water exploration holes, floor reinforcement holes, and high-level holes in t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B7/24E21B17/02E21B28/00
CPCE21B7/04E21B7/24E21B17/02E21B28/00
Inventor 王力姚宁平王毅徐保龙贾明群马斌张金宝
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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