CAJ | 학술논문

在深孔中采用双塞浮力法下瓦斯抽排管，由于处于两塞之间带压空气的排出速度难以控制，常造成泥浆管喷现象；加之管内外压力差较大，造成瘪管事故，导致下管失败。基于此，提出用加气混凝土块置换泥浆产生浮力的下管方法。当加气混凝土块密度为660 kg/m3时，由压力罐油压实验，测得其围压强度为6 MPa，对应在泥浆中下放深度为500 m；实验测得其体积收缩率为1.68％，在应用中可以不考虑其体积变化。该方法在现场应用表明，加气混凝土置换泥浆产生的浮力，减轻钻塔负载；由于工作管内、外无压力差，彻底避免瘪管事故；与加塞浮力下管法相比，管材壁厚减薄三分之一，带来明显的经济效益。
재심공중채용쌍새부역법하와사추배관，유우처우량새지간대압공기적배출속도난이공제，상조성니장관분현상；가지관내외압력차교대，조성별관사고，도치하관실패。기우차，제출용가기혼응토괴치환니장산생부력적하관방법。당가기혼응토괴밀도위660 kg/m3시，유압력관유압실험，측득기위압강도위6 MPa，대응재니장중하방심도위500 m；실험측득기체적수축솔위1.68％，재응용중가이불고필기체적변화。해방법재현장응용표명，가기혼응토치환니장산생적부력，감경찬탑부재；유우공작관내、외무압력차，철저피면별관사고；여가새부력하관법상비，관재벽후감박삼분지일，대래명현적경제효익。
In the deep hole of gas pumping,double plugs buoyancy method is used to install mine gas pipe.Because velocity of exhausting the pressure air in two plugs is difficulty controlled and there is large pressure difference between internal and external gas pipe,sometimes the pipe is collapsed and mud sprays out the pipe,at last the sinking pipe is failure.Based on the above reasons,the buoyancy method of sinking pipe is put forward filling of the autoclaved aerated concrete blocks used for floating pipes.In the experiment,the autoclaved aerated concrete blocks are put in the pressure tank,and then confining pressure strength of the AAC is 6 MPa which is associated with 500 m depth under the mud and the vol-ume change rate of the AAC,which should not be considered in the application,is also measured to be 1.68% while the density of the AAC is 660 kg/m3 .Field application shows that the pipe filling of auto-claved aerated concrete blocks reduce the load of the rig.For the pressure between internal and external gas pipe is equal,what the collapse of the pipe is completely avoided and that pipe wall becomes thinner brings obvious economic benefit.