METHOD FOR BIT WEAR DETERMINATION DURING WELL DRILLING OR SECONDARY HOLE PREDRILLING

• Main Authors: ZAKHAROV ANDREJ ALEKSANDROVICH, STREL'TSOV VIKTOR MIKHAJLOVICH, BUDNIKOV VLADIMIR FEDOROVICH, MORDOVIN VLADIMIR ALEKSANDROVICH, GERAS'KIN VADIM GEORGIEVICH, CHERNENKO ANATOLIJ MIKHAJLOVICH, GORBENKO VIKTOR NIKOLAEVICH, SHUMAKOV VALERIJ PAVLOVICH, SHOSTAK ANDREJ VALER'EVICH, SYCHEV NIKOLAJ FEDOROVICH
• Format: Patent
• Language: English; Russian
• Published: 27.04.2007
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

FIELD: well drilling, particularly drilling of slightly inclined wells along with current well coordinate measurement. ^ SUBSTANCE: method involves determining axial load applied to bit, bit rotation speed, drilling mud supply rate and current hole bottom coordinates, namely zenith, apsidal and azimuth angles; measuring natural gamma radiation of rock to be drilled and longitudinal drilling string vibration by means of sensors included in downhole instrument of telemetering system provided with communication channel to communicate hole bottom with day surface; determining lithologically uniform drillable rock bound and longitudinal drilling string vibration corresponding to them; comparing obtained values of actual longitudinal bit vibrations with that obtained from estimated dependence and if above values differ drilling operation is terminated and bit is lifted for inspection thereof. ^ EFFECT: increased time of bit presence in well bottom. ^ 1 ex, 2 dwg