An elastic clamping positioning mechanism for the inner tube assembly of a rope core drilling tool

Abstract

An elastic clamp positioning mechanism for the inner tube assembly of a rope core drilling tool, including a recovery tube, an elastic clamp frame, an elastic clamp limit block, an elastic clamp, an elastic clamp seat and a support plate; the recovery tube is assembled with a spear head assembly, Set the bullet card frame in the recovery pipe; arrange the bullet card limit block, the bullet caliper, the bullet card seat and the support plate in the bullet card frame, wherein the bullet card limit block, the bullet caliper and the support plate all include left and right symmetrical Two parts; the left and right parts of the bullet stop block are hinged together, and the hinge shaft of the bullet stop block is installed on the side wall of the recovery pipe, and they are also hingedly assembled with the left and right parts of the bullet caliper; the left and right parts of the bullet caliper The parts are hinged together, and the hinge shaft of the bullet caliper is assembled with the cartridge holder; the lower end surface of the cartridge holder is in contact with the support plate; the left and right parts of the support plate are hinged together, and the hinge shaft of the support plate is assembled with the cartridge holder. The invention can remove the dead structure of the bullet caliper and the bullet catch stop head, so that the bullet clip can be recovered inwardly, and the purpose of successfully completing the salvage of the inner pipe assembly is achieved.

Description

technical field [0001] The invention relates to a wireline coring drilling tool, in particular to an elastic clamping and positioning mechanism for an inner tube assembly of a wireline coring drilling tool. Background technique [0002] In order to grasp the underground geological situation, people usually adopt the method of drilling and coring to obtain real and reliable underground rock formation data. The wireline coring method has been widely used in various drilling engineering fields such as geological exploration, hydrogeology and engineering investigation due to its advantages of high drilling efficiency, low cost, and fewer drilling accidents. Serialization. [0003] Ultra-deep scientific drilling is a scientific exploration activity for geological research by taking cores from ultra-deep holes and reusing the obtained cores. Heart drilled into craftsmanship. When drilling and taking cores in complex formations in ultra-deep scientific drilling, core tubes often...

AI Technical Summary

Problems solved by technology

When drilling and taking cores in complex formations in ultra-deep scientific drilling, core tubes often become clogged. However, the existing positioning mechanisms for the inner tube assembly of wireline coring tools are generally in the form of ball clamp positioning and bullet clamp positioning. The bullet caliper of the bullet card positioning mechanism adopts a single-point hinged mode, as attached figure 1 As shown, the axial contact surface of the bullet caliper 6 and the bullet stop head 12 is a plane, and when the core is drilled normally, the left and right parts of the bullet caliper 6 can be rotated inwardly to the inside of the core tube 2, and the clamping limit is released, and it is smooth. Salvage the inner drill assembly to the ground; but when the core is blocked, the coring tube 2 is forced to move up, driving the upper end surface 6-1 of the bullet caliper and the stopper head 12 of the bullet caliper to push against each other, and after the bullet caliper 6 loses the turning space Form a rigid structure (as attached figure 2 As shown), the cartridge cannot be recovered, and the inner pipe assembly fails to be salvaged. At this time, the drilling tool in the hole can only be lifted to the surface by comprehensive drilling method, which greatly reduces the use efficiency of the wireline drilling tool. For wireline coring drilling in extra-deep holes, it takes longer to fully lift the drill, and the efficiency decreases more prominently, and the drilling cost increases significantly

Another ball clamp positioning method utilizes the rolling characteristics of the steel ball. Although it can avoid the problem of jacking up when the core is blocked, the force between the positioning steel ball and the outer tube is extremely large, and the outer tube assembly is easy to be blocked by the bullet. The connecting thread of the head and the cartridge chamber swells and cracks, which leads to accidents in the hole. At the same time, the positioning steel ball is easily deformed after being squeezed. After repeated use, the rolling and retracting performance of the steel ball is weakened, which reduces the reliability of salvage.

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