METHOD OF SEALING GAS EXTRACTION DRILLED HOLE BY USING POLYURETHANE SAFELY

• Main Authors: ZHANG, Zhen, WANG, Yingjie, SONG, Lei, ZHANG, Yunfeng, HUANG, Lanying, SONG, Xuejuan, SHAN, Hao, JIANG, Hui, HU, Dongliang, LU, Ligang, WANG, Shengcheng, YANG, Jie, XIA, Hongchun, ZHANG, Qipeng, HU, Yilu, ZHU, Xinge
• Format: Patent
• Language: English
• Published: 15.04.2021
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The present invention discloses a method of sealing a gas extraction drilled hole by using polyurethane safely. Drilling cuttings generated in a drilling process of the gas extraction drilled hole are turned into an aggregate in polyurethane, so that the usage amount of a polyurethane material is reduced and heat released by a reaction of the polyurethane material can be further absorbed. Phase change material microcapsules are doped into polyurethane, so that heat released by polyurethane is further absorbed by means of a phase change heat absorbing effect fully. Hole sealing tubes of the gas extraction drilled hole are arranged by way of connecting conventional hole sealing tubes and thick hole sealing tubes alternately. As the thick hole sealing tube is larger in diameter, the volume of a sealed space is smaller, so that the usage amount of a hole sealing material for filling the sealed space is further reduced, the heating amount is reduced and the bonding force and the frictional force between the hole sealing material and a hole wall and the hole sealing tube can be further increased, and the hole sealing quality is improved. Under the synergistic effect of various modes, the reaction temperature of the polyurethane hole sealing material can be reduced effectively, so that the hole is sealed by using polyurethane safely, and the method is wide in applicability. Fig. 1