鄂尔多斯盆地神府区块小井眼优快钻井关键技术

鄂尔多斯盆地神府区块为致密气产区,为进一步提高该区块的机械钻速、降低钻井成本,开展了小井眼优快钻井技术研究.井眼轨道由"直—增—稳—增—稳"优化为与地层走向精确匹配的"直—增—降—稳",提高了钻井效率;钻头进行了优化设计,改变了钻头布齿密度,调整了钻头切削齿尺寸和后倾角,增强了钻头的稳定性和耐磨性;优化了钻具组合,优选...

Key Technology of Optimized and Fast Slim Hole Drilling in Shenfu Block,Ordos Basin

The Shenfu Block in Ordos Basin is a tight gas-producing area. In this study, optimized and fast drilling technology for slim holes was explored to further increase the rate of penetration (ROP) and reduce the drilling cost in this block. The wellbore trajectory was optimized from "vertical–build–hold–build–hold" to "vertical–build–drop–hold" matching the formation strike, which improved the drilling efficiency. The drill bit was optimized, including the change of tooth density, adjustment of cutting tooth size and caster angle, and enhancement of stability and wear resistance. The drilling assembly, size of the drill pipe, and postive displacement motor (PDM) were optimized, and a three-dimensional (3D) vibration impactor was developed for enhancing the ROP. Additionally, the performance of the drilling fluid was improved by the introduction of a biomimetic lubricant and the optimization of the drilling fluid formula. Further, drilling parameters were also optimized. The key technology of optimized and fast slim hole drilling relying on the above measures was applied in 8 wells in Shenfu Block, realizing the one-trip drilling of the second-spud section. The ROP was increased by more than 50% and the drilling cycle was shortened by 45%. This technology provides technical support for future drilling of tight gas wells in Shenfu Block and a reference for the drilling of tight gas wells in other regions in China.