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Drill string vibration drag reduction method for near-horizontal long borehole directional drilling in coal mine

A technology of directional drilling and long drilling, applied in directional drilling, vibration drilling, vibration generating device, etc., can solve the problems of poor track controllability, rapid wear of drill bits, etc., to reduce the feed force and reduce the size of the drill string Friction resistance, the effect of reducing the stress state

Active Publication Date: 2019-11-08
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
  • Description
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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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  • Drill string vibration drag reduction method for near-horizontal long borehole directional drilling in coal mine
  • Drill string vibration drag reduction method for near-horizontal long borehole directional drilling in coal mine
  • Drill string vibration drag reduction method for near-horizontal long borehole directional drilling in 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 method for reducing drag by vibration of a drill string for directional drilling in a near-horizontal long hole in a coal mine, including conventional directional drilling, determining the installation position of a vibration generator, and a construction method for drilling with vibration for drag reduction; The amplitude of the exciting force and the size and material of the drill string are determined, causing the front part to drive the rear part of the drill string to vibrate. At the same time, the stress wave generated by the vibration disappears before being transmitted to the measuring instrument while drilling and the bottom hole drilling tool, which does not affect the drilling while drilling. The normal use of measuring instruments and bottom-hole drilling tools; thus, the present invention realizes the vibration function of the drill string when the deep hole directional drilling in the coal mine is underground, converts static friction into dynamic friction, and can effectively reduce the buckling deformation of the drill string, thereby It is of great significance to greatly reduce the drilling friction and realize signal transmission with the current mature cable communication drill pipe, which is of great significance for improving the depth of directional drilling and the efficiency of deep hole directional drilling.

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 method. With the increasing application of directional drilling technology in water exploration holes, floor reinforcement holes, and high-level holes in...

Claims

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Application Information

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Patent Type & Authority Patents(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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