河元背地区绳索取心钻进泵压计算模型的建立与应用

Establishment of Pump Pressure Calculation Model for Wire-line Core Drilling in Heyuanbei Area and the Application

摘要:

泵压是反映金刚石绳索取心钻进时井内作业是否正常的重要参数。为了进一步研究泵压波动变化与实际钻进作业之间的关系，指导钻进工作的快速、安全开展，结合江西相山河元背地区CUSD2井实际泵压波动数据及相关钻进资料，建立了适用于本井的循环系统压力损失计算模型。对比分析模型计算的理论泵压与实际泵压的波动变化趋势，将模型应用于实际钻进，在此基础上预测后续地层的泵压波动区域范围，发现7 MPa的泵压安全值不再适用于后续地层钻进，调整设置泵压安全值为10 MPa，并利用邻井泵压波动数据进一步验证其可靠性。适当调整修正理论模型，使其可应用于河元背以及相山地区绳索取心钻进中，指导该地区钻探工作。

Abstract:

Pump pressure is one of the important parameters of diamond wire-line core drilling, which can reflect whether the operation is normal in the well. In order to further study the relationship between pump pressure fluctuation and the actual drilling operation for fast and safe drilling, on the basis of the actual pump pressure data of CUSD2 in Heyuanbei of Jiangxi and the related drilling data, a pressure loss calculation model for drilling circulation system is established. Comparing the fluctuation trend of theoretical pump pressure calculated by analysis model and actual pump pressure and using the model to the actual drilling, the pump pressure fluctuation in subsequent formation was predicted, it was found that 7MPa pump pressure safety value was no longer suitable for subsequent drilling, then the safety value was adjusted to 10MPa. The reliability was verified by the pump pressure fluctuation data of adjacent well. By the appropriate adjustment and correction, this theoretical model can be applied in wire-line core drilling in Heyuanbei and the whole Xiangshan area.