Key Structural Parameters Analysis of Effective HydroClean Drill Pipe

In directional well, horizontal well and extended reach well, there is a common problem that cuttings bed is easy to form in the process of drilling in highly deviated section. To solve this problem, an Effective Hydro Clean Drill Pipe (EHCDP) is designed, and the flow characteristics of the annular flow field under the action of EHCDP are analyzed by using computational fluid dynamics (CFD) simulation technology. On this basis, the key structural parameters affecting the swirl characteristics of EHCDP are studied. The results show that when the number of spiral grooves is 3, the axial and tangential velocities of annular fluid in spiral groove section will be greater, which is conducive to carrying and removing cuttings. Compared with the inclination angle of spiral groove with 1000 mm lead, that of spiral groove with 500 mm lead is larger, which has more obvious stirring effect on flow field, and the effect of cuttings removal is better. In addition, the spiral groove with 90 degree groove angle is more conducive to cuttings removal than the spiral groove with 30 degree groove angle. The results can provide a basis for the selection and optimization of structural parameters of spiral groove.