METHOD OF NON-CONTACT DOWNHOLE TEMPERATURE MEASUREMENT DURING DRILLING Russian patent published in 2008 - IPC E21B47/06 B24B49/12 

FIELD: mining.

SUBSTANCE: invention refers to the mining industry, namely to the drilling equipment, and is designed for research of optimal drilling mode parameters based upon the temperature rise criteria in the contact zone of the drilling tool and the rock. For this purpose, the temperature of the contact zone of the drilling tool and the rock is measured by the pyrometry method by rotating the rock sample while the tool remains steady. IR-radiation is directed to the receiver by the means of a fiber optic cable laid through the tool's cannelure and connected to the IR-radiation receiver. Then, it is transformed into analog signal, got amplified and fed to the recording device. Besides, cold water is fed to the cannelure through the tool inner cavity, in order to reduce the hindrances from additional IR-radiation of heated fiber optic cable walls by cooling the cable down. The working end of the optic cable is insulated from the water-bearing cavity with sealer.

EFFECT: setting the optimal drilling mode parameters by the contact zone temperature of the tool and the rock, as measured on the testing bench.

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