苏联石油产品储运及应用科学研究所研制出一种用于处理落井钻杆、套管和油管的内撑式打捞矛,这种工具的特点是依靠旋转来增强落鱼与打捞矛的连接强度,因而它具有更大的提载能力。 内撑式打捞矛的结构如图所示。它由带左旋凸起螺纹锥面的本体1、开槽的撑抓套3、引鞋4以及撑环2所组成。撑环与撑抓套的接触端面加工成三角形凸缘5。打捞矛上段有螺 The Soviet Union’s Institute of Petroleum Products Storage, Transport and Applications developed an internally-armed salvage spear for handling downhole drill pipes, casing and tubing. This tool relies on rotation to enhance the connection between the fish and the spear , So it has a greater carrying capacity. The internal structure of the spear spear as shown. It is composed of a body 1 with a left-handed convex thread conical surface, a grooved support sleeve 3, a guide shoe 4 and a support ring 2. Bracing ring and support sleeve contact end surface processed into a triangular flange 5. Salvage spear snails on the upper section