A5101980446- Drilling and Well Engineering
- Tunneling and Rock Mechanics
- Hydraulic Fracturing and Reservoir Analysis
- Reservoir Engineering and Simulation Methods
- Oil and Gas Production Techniques
- Endodontics and Root Canal Treatments
Shandong Institute of Automation
2017-2020
China University of Geosciences
2017-2020
In this article, a systematic linear parameter-varying (LPV) model and gain-scheduled control methodology for drill-string systems are proposed to analyze dynamics suppress stick-slip vibrations, finally achieving efficient drilling. First, the changing length of drill string over entire drilling process is emphasized corresponding LPV presented by combining existing multi-degree-of-freedom (DOF) model, so as capture length-varying effect. Then, we construct generalized structure based on H...
Stick–slip vibrations are widespread and hazardous phenomena in drilling practice. The objective of this paper is to develop a simple general control strategy minimise such together with unknown disturbances. Taking into account the transmission delay torsional energy from surface downhole, neutral-type drill-string model established applied rather than lumped-parameter that cannot provide satisfactory modelling precision. Based on model, major contribution consists combination disturbance...
A controller is proposed based on the equivalent input disturbance (EID) method to suppress stick-slip vibration of drilling process. The drillstring system described by a neutral type model with unknown disturbances, where disturbances are mainly nonlinear bit-rock reaction. core idea this approach use EID variety external and impact caused state delay model. main advantage our that does not depend specific model, which great significance for suppression control in complex stratigraphic...
A control method is proposed to suppress stick-slip vibration of drillstring system based on tracking with zero steady-state error and state observer in this paper. multiple degree-of-freedom (DOF) model dynamic presented first, which considers high-order modal vibration. Then, constructed estimate the states system, whose are usually difficult measure top system. Finally, combing feedback internal principle, a ensure speed rotary table bit consistent. The proposal only need measurement, can...
Facing the demand of efficiency and safety drilling process, it is necessary to find optimal trajectory in complex geological environment. To solve this multi-objective optimization problem, non-dominated sorting genetic algorithm II (NSGA-II) applied. And Linear sum weighted method applied at same time for comparison. Firstly, numerical model a sidestracking horizontal well established by nature curve method. Constraints subjected engineering conditions objective functions are discussed....
With the increase in drilling depth, encountered formations become more complicated, and industrial controller for weight on bit has limited precision due to uncertain varying formations. In this paper, we design a scheme of control system achieve higher complex geological process. A double-loop structure is introduced, which involves with two models: multi-degree-of-freedom lumped parameter drill string model finite element bit-rock interaction model. The effect analyzed, strategy presented paper.