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前几年,我参与了广东水文二队处理一起重大井内事故的工作.当时运用微型孔底喷反钻具打捞障碍物,并作为扫、劈、掏等措施的配套工具,使用效果很好.现将此项经验简介于后,供同志们参考.那起事故的大体情况是:钻具被卡后,经强力打、顶、反无效;孔内套管、花管多处破裂、错动、脱扣及下跑;孔壁坍塌掉块厉害;孔深近500米,孔径为89毫米;运用喷反钴具前,曾发生过几次跑管、误扫和误劈等重复事故.情势严重到放弃处理的边缘.经运用喷反钻具,竟将数以百斤计的套管残边、合金片和坍掉物等打捞干净,保证了事故处理措施的顺利进行.我体会,这项经验的突出优点有二:一、由于喷反钻具抽吸力强,能使孔底障碍物随冲洗渡进入钻具之内,以排除杂物在孔壁(或套管)与钻具之间造成挤夹的威胁,在捞渣和扫、劈、掏过程中,消除孔内阻力干扰,从而为采取处故措施,提供安全的工作环境.二、用微型喷反钻具打捞障碍物时,不但少受孔径限制(φ75以下的岩心管均可以用)、可连接长岩心管(4～5米)进行捞渣,而且
A few years ago, I participated in the work of the Guangdong Hydrological Second Team in handling a major accident in the well. At that time, the use of mini-hole-bottom spray-back drilling tools to salvage obstructions was used very well as an accessory tool for sweeping, splitting and digging. The experience is now briefed for the comrades for reference.The general situation is that after the accident: the drill was stuck, the strong hit, top, anti-ineffective; hole casing, spent pipe rupture, staggered , Tripping and running down; hole wall collapsed block powerful; hole depth of nearly 500 meters, a hole diameter of 89 mm; the use of spray anti-Cobalt before, there have been several runs, misjudgment and error splitting and other repetitive accidents. Seriously to the brink of giving up treatment.Using spray reverse drilling tools, actually hundreds of pounds of casing debris, alloy pieces and slump and other salvage clean, to ensure the smooth handling of accident handling measures.I understand that this The experience of the outstanding advantages of two: First, due to spray drill reverse suction strong, can make the bottom of the hole with the rinse into the drill into the device to remove debris in the hole wall (or casing) and the drill Resulting in the threat of pinch, in the slag and sweep, hacking, dig in the process, eliminating the interference resistance holes, so as to take precautionary measures , To provide a safe working environment.Second, using micro-jet drill to retrieve obstacles, not only less subject to aperture restrictions (φ75 below the core tube can be used), can connect the long core tube (4-5 meters) for slag ,and