A wireline core drilling tool

Abstract

A wireline coring drilling tool, comprising an outer tube assembly and an inner tube assembly; the inner tube assembly is provided with a snap-in positioning mechanism, an in-position reporting and core blockage alarm mechanism, a single-action mechanism, a core check valve mechanism, a core Tube and core breaking mechanism, the bullet clamping positioning mechanism adopts multi-point hinged mode, the in-position reporting and core blockage alarming mechanism are integrated, and the single-acting mechanism adopts the upper and lower sets of PDC bearings and the TC bearing arranged in the middle. , the core one-way valve mechanism controls the opening and closing of the one-way valve through the cooperation of the steel ball and the liftable valve seat; Pipe, lower reamer and drill bit, a ring seat is embedded in the ring groove formed between the lower end of the cartridge chamber and the inner side wall of the upper reamer, and a ring seat is embedded between the lower end of the outer tube and the inner side wall of the lower reamer A centralizing ring is embedded in the formed ring groove. The invention can improve the drilling efficiency of coring and the quality of core collection, and achieve the purpose of saving drilling cost.

Description

technical field [0001] The invention relates to a wireline core drilling tool, in particular to a wireline core drilling tool suitable for ultra-deep scientific drilling. 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 cores obtained. In order to improve the efficiency of coring drilling and the quality of core collection, and to save drilling costs The wireline core drilling process was also chosen. Affec...

AI Technical Summary

Problems solved by technology

However, existing wireline coring tools have certain defects in the coordination of internal and external assemblies and the positioning of internal assemblies, in-place notifications, core blockage alarms, single-action mechanisms, and core pipe check valves. The main defects are as follows: A few aspects: First, the cartridge positioning mechanism of the inner assembly adopts a single-point hinged method. When the core pipe is blocked, it is easy to cause the cartridge to be blocked, resulting in the failure of the cartridge to be recovered and the salvage failure of the inner pipe assembly. Second, the in-position reporting mechanism and the core plugging alarm mechanism of the wireline coring tool are set independently. Not only are there a large number of parts, but also the reliability of the in-position reporting and core plugging alarm prompts is poor. There are problems such as the phenomenon of single pipe during drilling and large core loss; thirdly, in the core pipe check valve mechanism, the steel ball is used to cooperate with the fixed valve seat. Small, the steel ball and the fixed ball seat are in a bonded state during surface core out operation, causing negative pressure inside the core tube, increasing the difficulty of core out and working time; fourth, in the single-action mechanism, the upper and lower groups are used Thrust ball bearings are matched, and the outer diameter of the drill pipe of the ultra-deep hole drilling tool is increased in design, and the corresponding drill bit lip surface is also increased. The corresponding WOB increases during the drilling process of the drilling tool. Feedback to the upward force of the thrust bearing increases at the same time. In addition, due to the complex working conditions at the bottom of the hole, the thrust ball bearing is easily damaged under the action of large load and alternating stress, resulting in single-action failure, causing the core tube to drill core. Fifth, in the heart breaking mechanism, the retaining ring is an open elastic retaining ring placed in the annular groove of the retaining spring, which limits the axial position of the retaining spring, because the disassembly process takes more time. Time, the retaining ring is generally not used during on-site operation. During the drilling process, the clamp spring clamps the core and then moves up, and the end of the core tube is used to limit the position, which will easily cause the end of the core tube to wear and fail

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