Quadruple-tube fidelity coring drill tool for complex formations

Abstract

The invention provides a quadruple-tube fidelity coring drill tool for complex formations. The drill tool comprises an outer tube assembly and an inner tube assembly. An annular gap is formed betweenthe outer tube assembly and the inner tube assembly. The outer tube assembly comprises a tool joint, a connection tube, a water joint, a core outer tube and a bottom spray drill which are connected sequentially from top to bottom. The inner tube assembly comprises a core column and a core inner tube. The inner tube assembly is connected with the outer tube assembly through the core column. The upper end of the core column is in spherical hinge with the tool joint through a connecting rod. A triple semi-closed tube and an extensible quadruple hose are mounted in the core inner tube. A snap spring is arranged at the lower end of the core inner tube. The quadruple-tube fidelity coring drill tool has the advantages that the triple semi-closed tube and the extensible quadruple hose are arrangedon the quadruple-tube fidelity coring drill tool, so that a core sample is taken out conveniently, and the original state of the core sample is maintained; through an internal spherical hinge mode, single acting of the core inner tube is achieved; the snap ring arranged at the bottom prevents the core sample from sequence reversing, and coring quality and coring rate of the complex formations areimproved.

Description

technical field [0001] The invention belongs to the field of drilling, and in particular relates to a quadruple tube fidelity core drilling tool for complex formations, which can be widely used in the drilling fields of geology, water conservancy and hydropower, coal, petroleum and other departments. Background technique [0002] Core samples are the most intuitive and accurate data for evaluating mineral resource reserves and geological structures. It is of great significance to accurately obtain representative core samples by using reasonable drilling techniques and tools. For hard and complete rock ore layers, traditional core drilling tools can be used to obtain core samples that meet the quality requirements. Representative core samples are very difficult. On the one hand, the stability of the formed core samples is poor, and it is difficult to take them out from the drilling tool. On the other hand, the performance of the core samples cannot be guaranteed, and even som...

AI Technical Summary

Problems solved by technology

For hard and complete rock ore layers, traditional core drilling tools can be used to obtain core samples that meet the quality requirements. Representative core samples are very difficult. On the one hand, the stability of the formed core samples is poor, and it is difficult to take them out from the drilling tool. On the other hand, the performance of the core samples cannot be guaranteed, and even some complex formations cannot be cored at all, seriously affecting People's correct evaluation of mineral resources, formation conditions, etc.

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