冻土区天然气水合物试采对接井冲洗液技术

Technology of Flushing Fluid for Gas Hydrate Trial Mining Horizontally Butted Well in Permafrost Area

摘要:

2015年，在祁连山木里冻土区进行了天然气水合物试采对接井施工。根据木里地区的地层条件，针对孔壁易出现的水化、坍塌、掉块等现象，制定了冲洗液配方，通过合理调整处理剂的用量，达到良好的护壁及润滑效果。使用过程中对密度、粘度、含砂量、失水量等参数进行了监测，并对冲洗液性能作出及时调整。应用结果表明，该冲洗液配方具有良好的综合性能，能够满足冻土区天然气水合物试采井钻探施工要求。

Abstract:

In 2015, gas hydrate trial mining horizontally butted well was constructed in Qilian Mountain Muli permafrost area, The formula of flushing fluid was designed optimally according to the formation conditions such as hydration, collapsing and chipping. Good wall protection and lubrication results were achieved by adjusting the dosage of drilling mud additives reasonably. Mud parameters such as density, viscosity, sand content, filter loss and some others were monitored in the application, and the properties of flushing fluid were timely adjusted. The application results show that the flushing fluid has good comprehensive properties and can meet the requirements of trial mining well drilling construction.