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当前,大直径钻井法在英国不仅用于盲井钻进,而且还作为一种辅助手段进行巷道掘进,现介绍如下.一、钻井法施工中的几项新技术到目前为止,在钻井法施工中,已经使用了几种洗井液循环系统,其中最常用的是洗井反循环系统,即洗井液依自重流入井筒,经刀具表面,由钻杆内部返回地面.本文作者发明了一种新的洗井液循环方法——泵送反循环法.这种方法的工作原理是将一台装配在特殊容器中的潜水泵安装在钻杆组之间,作为它的一部分,该容器唯一的进、出口分别与其上部钻杆和下部钻杆相接,当潜水泵随钻杆下放到井筒中之后,其内部充满了洗井液,由于潜水泵动作,这部分洗井液经钻杆、水笼头和排浆管被排到地面.在液体压力作用下,井底的洗井液又从潜水泵下部与钻头相通的钻杆中流人容器和潜水泵内.在浅井
Currently, the large diameter drilling method is used in the UK not only for blind well drilling, but also as an auxiliary means of roadway excavation, are described as follows: First, several new drilling technology construction technology So far, drilling method construction , Several types of fluid well circulation systems have been used, of which the most commonly used is the well flushing reverse circulation system, that is, the well fluid flows by gravity into the wellbore and passes through the surface of the tool and returns to the ground from inside the drill pipe. The new method of circulating fluid in the wellbore - the pump reverse cycle method - works by installing a submersible pump fitted in a special container between and as part of a drill string that is unique Inlet and outlet are respectively connected with the upper drill pipe and the lower drill pipe. When the submersible pump is lowered into the wellbore with the drill pipe, the inside of the submersible pump is filled with the washout fluid. Due to the action of the submersible pump, the part of the washout fluid passes through the drill pipe, the water The halter and the discharge pipe are drained to the ground and the fluid under pressure causes the wellbore bottomhole fluid to flow into the vessel and submersible pump from the drill pipe in the lower part of the submersible pump which is in communication with the drill bit.