Abstract
Thick coal seam BK block the distribution appears below 2500 meters long, loose and mixed carbonaceous mudstone. Release a new borehole pressure after the drill will cause collapse block falling, finally form an approximate elliptical hole, such as malignant accidents caused by its drill, bit freezing trip even well abandonment. Through three times of immersion test evaluation of the anti collapse ability of NH-1 core, NH-1 drilling fluid system has been optimized. Results show that, the drilling fluid has strong inhibition and anti pollution. The plastic viscosity is 24 mPa·s, the shear stress of 11Pa and the permeability recovery value reached (81.9-89.6)%. The success of the test card 21 Ping 1 well shows that the system of NH-1 drilling fluid has strong inhibition can effectively solve the Jurassic coal and carbonaceous shale collapse, the current high lubricating performance, can effectively improve the drilling speed, at the same time, its performance for reservoir protection, control the rheological properties of drilling fluid, improve the anti pollution and reduce the occurrence of downhole complicated conditions. Therefore, it can be in the sloughing formation for drilling operation reference for future.
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