<title>Abstract</title> To address the issue of low drilling efficiency in horizontal wells, a Drilling String Rotary Orientation Tool (DROT) has been proposed, and its dynamic characteristics have comprehensively examined. The model drill string system established, axial response both with without DROT are analyzed. findings indicate that when displacement each unit stabilizes following use tools, upper lower limits increase, while width fluctuation interval decreases. Further analysis...

With the development of petroleum exploration and drilling, current drilling tools are facing more difficulty situations, which lead to these problems such as low speed, weak rock breaking ability or short service time. Based on this background, we propose a new tool is proposed in paper. By analyzing force cam roller system, dynamic differential equations horizontal drill string established. The key parameters' influences axial impact studied first. outputs, vibration characteristics system...

Abstract In the process of long horizontal well in directional drilling, serious contact between drill string and wellbore leads to weight on bit loss. Therefore, this paper proposes a rotary controller (DSC) for well, its function test is completed through experimental platform. Connected DSC working mechanism, coupling dynamic model established under conditions drilling. case study, characteristics different units, including pipes bottom-of-hole modules axial torsional directions, are...

Due to the complexity and uncertainty of downhole conditions during drilling, torsional vibration generated at drill bit may cause bottom hole assembly (BHA) excite high frequency longitudinal vibration, which lead bounce string in severe cases. The excessive will seriously affects service life or other tools. To avoid these problems reduce stick-slip phenomenon, this paper proposed an innovative longitudinal-torsional coupling tool, can generate appropriate vibration. With analysis working...

Abstract Internal motion and dynamics mechanism studies of a new composite percussion drilling tool aim at reducing stick-slip phenomenon improving rock breaking efficiency. In this study, experiments are performed using tools to investigate its torsional axial impact performance. According the experimental results, six degrees-of-freedom (6DOF) rigid body model was established study passive hammer. The obtained including tangential acceleration, were verified with data, small pressure...

Abstract Aiming at the problem of low drilling efficiency oil and gas wells due to high friction during drilling, a dual-piston axial oscillation drag reduction tool (DAOT) is proposed reduce for long drill string in this paper. Using proportional experiment methods based on ground conditions, pressure drop, displacement, acceleration DAOT were tested with different input parameters. The drop calculation model was established by fluid mechanisms applied, excitation displacement damped...

Abstract Conventional directional drilling mainly relies on the sliding of screw motor and drill string to realize change wellbore trajectory, so friction force is large. The use reduction tools that generate axial state can only achieve partial reduction, still in a during drilling. These problems are solved by using rotary steerable system, which when rotates. But its cost high. Considering principle high efficiency economy, new tool called rotation controller proposed, also used reduce...

The characteristics of a drill string system have an essential influence on the performance directional drilling. appropriate control method is important to drilling efficiency and downhole operation safety. Therefore, based new mechanical rotary steerable tool (RST), this paper aims analyze Dynamic Characteristics RST in Directional Drilling. First, considering thrust force generated by bottom hole assembly (BHA), governing vibration equations are established. Furthermore, connected with...

Buckling may cause drill string damage or even drilling failure. For the 3[Formula: see text]000-m-long horizontal section string, a simplified analysis model of in well is established, and dynamic response results axial displacement, angular displacement contact force are obtained. When buckling, closer position to bottom, later buckling time, smaller deformation degree, slower growth rate attenuation degree amplitude. After undergoes tensile eventually remains stable state. stabilization,...