Drag‐Reduction Performance Evaluation of Controllable Hybrid Steering Drilling System

Abstract

The excessive drag/torque and the backing pressure is an important factor that restricts the improvement of the penetration rate and the extension of the drilling in the sliding drilling process of extended-reach wells and horizontal wells. To deal with this problem, this paper developed a novel controllable hybrid steering drilling system (CHSDS) based on the friction-reducing principle of a rotating drill string. The CHSDS is composed of a gear clutch, hydraulic system, and measurement and control system. By controlling the meshing and separation of the clutch with the mud pulse signal, the CHSDS has two working states, which leads to two boundary conditions. Combined with the stiff-string drag torque model, the effects of the drilling parameters on the friction-reducing performance of the CHSDS are analyzed systematically. The results show that the friction reduction effect in the inclined section is the most significant, followed by that in the horizontal section, whereas there is almost no impact in the vertical section. Friction reduction increases with the rotary speed and the drilling fluid density, whereas it decreases with the increase in the surface weight-on-bit and the bit reaction torque. Field tests confirm the separation and meshing function of the CHSDS. The developed controllable hybrid steering and friction-reducing technology provides an alternative approach for the safe and high-efficiency drilling of horizontal wells.

Research on Low-Carbon, Energy-Saving Sintering Process with Uniform Temperature for Drill Bits

“…The large-diameter insulation pad (7), slightly larger than the insulation pads (6), helps stabilize the overall structure, preventing instability in the center of gravity and further isolates heat between the insulation pads ( 6) and the rotating mechanism. The rotating mechanism involves the rotating platform (8), bearings (9), fixed platform (10), and motor (11). During the sintering process of the drill bit, this mechanism ensures smooth and slow rotation, promoting more uniform sintering and improving drill bit quality.…”

“…This rotation ensures that the magnetic induction lines pass through every part of the mold, resulting in a more even heating of the drill bit during sintering. Figure 9 illustrates the rotary sintering mechanism designed in this study, comprising rotating platforms (8), bearings (9), fixed platforms (10), and motors (11). The motor is selected as a PFDE68KYYZ synchronous motor, and the corresponding parameters of rotational speed and torque are as follows in Table 2.…”

“…The quality of drill bits directly impacts the drilling cycle and associated costs. Higher drilling efficiency, longer lifespan, reduced frequency of starting and stopping drilling, shorter drilling cycles, and lower drilling costs are all desirable outcomes [6][7][8][9][10][11][12][13]. When considering the energy consumption in drilling, the energy required for the bit preparation is often overlooked, 2 of 18 as it appears insignificant compared to the energy consumed during drilling.…”