钻井水力参数对钻头优选的影响

Influence of drilling hydraulic parameters on the optimal bit

准噶尔盆地玛湖区块三叠系百口泉组地层钻头选型困难,严重制约着玛湖区块致密油的开发进度。针对常规因子分析法优选钻头过度注重机械破岩参数而忽略水力参数影响的问题,提出水力参数排量与泵压同时作为主要因子参与优选钻头,并在玛18井区验证了纯理论最优排量模型,给出了玛湖区块百口泉组最佳水力参数范围,即排量为15~18 L/s,泵压为18~28 MPa。现场实例证明:在玛131井区百口泉组地层中,当MSI613和MDI513钻头排量与泵压在最佳水力参数范围内时,其平均机械钻速分别为5.45 m/h和5.96 m/h,比在最佳水力参数范围外分别高出0.74 m/h和3.55 m/h,平均机械钻速分别提高了16%和60%,这表明该组最佳水力参数范围也适合于玛131井区百口泉组,对玛湖区块百口泉组地层现场优选钻头具有一定的指导意义。

Difficulties in bit selection in the Triassic Baikouquan formation of the Mahu block in Junggar basin have seriously restricted the development of tight oil in the Mahu block.According to the conventional factor analysis method,the optimized drill bit only focuses on mechanical rock breaking parameters,while ignoring the effect of hydraulic parameters.It is proposed that displacement and pump pressure are also the main factors to participate in the optimized drill bit.Practice in the Ma18 well area has verified the theoretical optimal displacement model.The optimal range of hydraulic parameters of Baikouquan formation in Mahu block is given,with displacement of 15-18 L/s and pump pressure of 18-28 MPa.Field examples show that when the displacement and pump pressure of MSI613 and MDI513 bit are within the optimal hydraulic parameters range in the Baikouquan formation in the Ma131 well area,the average mechanical drilling rate is 5.45 m/h and 5.96 m/h respectively,which are 0.74 m/h and 3.55 m/h higher than those outside the optimal hydraulic parameters range,and the average mechanical drilling rate is increased by 16%and 60%respectively.The results show that the optimal hydraulic parameters range of this formation is also suitable for Baikouquan formation in the Ma131 well area,which has certain guiding significance for optimizing the drilling bit in the formation site of Baikouquan formation in the Mahu block.