Downhole directional hole bedding guided drilling system and method based on formation lithology identification
A technology for formation lithology and directional drilling, which is applied in directional drilling, automatic control systems for drilling, drilling equipment, etc. It can solve the problems of unknown detailed fluctuations of the formation and the inability to ensure the long-distance extension of the actual drilling trajectory along the bed. Drilling construction efficiency and utilization effect, and the effect of ensuring the safety of drilling construction
Active Publication Date: 2016-10-26
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology
[0007] The present invention mainly solves the problem that in the prior art, when the downhole directional holes are drilled according to the spatial geometric positioning of the drilling trajectory, the actual drilling trajectory cannot be ensured to be in the tar
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[0036] see figure 1 , based on coal-measure formation lithology identification while drilling, the downhole directional hole drilling method along the bedding, the working steps are as follows:
[0037]Step 1: Preliminary design of downhole directional hole trajectory. Firstly, according to the construction purpose of the downhole directional hole, select the appropriate complete coal formation as the drilling target formation 1; then, according to the target coverage area of the downhole directional hole, design the azimuth and the left and right displacement of the downhole directional hole, and determine the plane extension direction of the downhole directional hole; then according to the target The thickness and inclination of formation 1, calculate the elevation of the upper boundary line 4 and the lower boundary line 5 along the extension direction of the downhole directional hole plane, design the downhole directional hole inclination and up and down displacement, and...
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The invention relates to a downhole directional hole bedding guided drilling system and method based on formation lithology identification. The lithology while-drilling identification of a drilling stratum is achieved through a direct parameter comparison method and an orientation radiating rose diagram comparison method according to coal measure stratum lithology while-drilling identification criteria and the stratum natural radiation value, measured by a coal measure stratum physical property parameter while-drilling measurement device in real time, of the near-bit position. By combination with measurement of a drilling track, precise space positioning of a practical drilling track relative to a target stratum is achieved, and bases are provided for controlling a downhole directional hole to do bedding extension in the target stratum in the preset direction; the technical problems that an existing underground coal mine directional drilling technology can only conduct drilling according to the space geometric positioning of the drilling track, cannot distinguish strata and is poor in drilling efficiency and low in target stratum elongation are solved; and through precise bedding directional drilling of the downhole directional hole, an effective means is provided for improving the drilling construction efficiency and the utilization effect, verifying the stratum geological information of a mine lot and ensuring drilling construction safety.
Description
technical field [0001] The invention relates to a drilling system and method, belonging to the field of coal mining, in particular to an underground directional drilling system and method based on formation lithology identification. Background technique [0002] Coal is an important pillar of my country's economic construction, but because my country's coal mines are mainly underground mining, the complex geological conditions of coal fields have brought serious threats to coal mine safety production, and gas disasters are the most serious accident type. [0003] Gas pre-drainage is the most effective technical means to reduce the gas content of coal seams and prevent gas disasters. It is also the basis for comprehensive utilization of gas. It is divided into two modes: ground mining and underground mining. Currently, underground mining is the main method, and mainly through Drill holes for gas pre-extraction. [0004] The depth, diameter and elongation of the target format...
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Login to view more IPC IPC(8): E21B7/04E21B44/00E21B47/022E21B49/00
CPCE21B7/04E21B44/005E21B47/022E21B49/00
Inventor 李泉新石智军方俊曹明温榕高珺毕志琴许超
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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