工区上部地层为泥岩层，蒙脱石与伊利石含量高，中下部地层为微裂缝发育的硬

The upper strata of the work area is mudstone with high content of montmorillonite and illite, and the middle and lower strata are hard and brittle shale with micro-cracks, interbedded with coal seams, which is extremely difficult to prevent collapse and plugging. GW-AMO white oil-based drilling fluid is used. Technology, the highest construction density reaches 2.2g/cm³, and the highest bottom hole temperature reaches 196℃, which solves the complex accidents of diameter reduction, well collapse and stuck drill in the area, and meets the needs of underground safety construction. The ROP is increased by about 1.1 times. The oil test capacity has been increased by approximately 2 times.

The upper formation of the industrial area is a mud rock layer, with high content of Montess rock and Yili stone, and the lower middle strata is a hard brittle mud shale with micro-crack development, a cerium seam, which is extremely difficult to prevent collapse and sealing, and the GW-AMO white oil-based drilling fluid technology is applied, with the highest construction density. Up to 2.2g/cm3, the maximum bottom temperature of 196 degrees C, to solve the region's shrinkage, well collapse and card drilling and other complex accidents, to meet the safety of underground construction needs, ROP increased by about 1.1 times, single well oil test capacity increased by about 2 times.

The drilling fluid has the highest density of 196-2g? Mud in the lower part of the well, which can meet the requirements of drilling in the upper part of the formation, which is up to 196-2g? Of shale, and the drilling fluid in the upper part of the well can meet the requirements of drilling in the upper part of the formation The ROP is increased by 1.1 times and the production test productivity of single well is increased by about 2 times.<br>