CALCULATION AND ANALYSIS OF THE STEERING FORCE OF THE COMPOUNDING SLIDE STEERING ASSEMBLY

The compounding slide steering drilling mode has its specific advantages in trajectory control of directional well and horizontal well. This paper calculates and analyzes the steering force of the conventional compounding slide steering assemblies. The results show that not all the assemblies exhibit angle holding or slight building-up capacity, and some even make angle dropping holes. Therefore, the steering ability of the BHAs should be simulated and analyzed before they are run in.The deviation force on bit when the tool face angle equals 90 degrees or 270 degrees could be approximately used as the steering characteristics of the assembly.It should be emphasized that the quality of downhole motor must be paid much attention to,and suitable drilling parameters should be applied so as to avoid pipe breakage or screwing off accidents.