富县天然气井直井优快钻井技术优化与应用

Optimization and Application of High Quality and High Speed Drilling Technology for Gas Well in Fuxian Gasfield

摘要:

为解决富县区块天然气井钻井机械钻速低、钻井周期长、井下复杂情况多等问题，开展了优快钻井技术研究。总结分析了富县气井钻井施工难点，通过岩石可钻性研究、岩屑滚动回收实验和处理剂筛选实验，同时结合现场应用，优选出各钻井参数。优选出一批能适应该区地层特征，耐磨性强，进尺效率高的钻头；优选钻具组合，采用转盘 螺杆的复合钻进方式；为保障井下安全，优选了钾铵基聚磺钻井液体系。现场应用表明，平均钻井周期由优化前80.96 d缩短至41.02 d，平均缩短39.94 d，缩短49.35%，井下事故复杂情况大大减少，为富县区块天然气井优快钻井提供了有力的技术支持。

Abstract:

The research is carried out on high quality and high speed drilling technology to solve low ROP, long drilling cycle and complex downhole instances of natural gas well in Fuxian block. The difficulties in drilling construction are summed up and analyzed; based on the study on rock drillability, by the cuttings rolling recovery experiment and agents screening experiment and combining with the field application, the drilling parameters are optimized. A group of bits are selected, which are applicable to the formation characteristics of this block with strong wear resistance and effective footage; bottom hole assembly is optimized with compound drilling of rotary table screw; potassium-ammonium polysufonate drilling fluid system are optimized to ensure downhole safety. Field practice shows that the average drilling cycle reduces 49.35% and the downhole accident reduces greatly, which provide the powerful technical support for high quality and high speed drilling in natural gas well of Fuxian block.