Control System Research And Winding Tension Model Of Coiled Tubing In The Roller

Coiled tubing technology has gradually developed into oil and gas field development in the field survey application more mature emerging technologies.Coiled tubing operation machine adaptability strongly, can be applied to all aspects of oil and gas operations, almost the equivalent of "universal working machine", while the life of coiled tubing equipment is to determine the core elements of the entire job.Therefore, an urgent need for the mechanical properties of coiled tubing during bending tensile deformation depth analysis and research.In this paper, the status quo of the coiled tubing on the mechanical behavior of the drum, tension control and other aspects of domestic and international first reviews, previous studies found that continuous tubing focused in force coiled tubing, deformation and the factors that affect their working life, etc., and some research on coiled tubing less tension mode, which made research direction-Coiled Tubing a tension mode process. While the coiled tubing operation machine working principle and an important part of a brief introduction.Secondly, combined with previous studies and the actual site, the use of elastic-plastic mechanics and material mechanics, the establishment of a wound on the drum coiled tubing operations during the mechanical model, and its internal forces and bending tension-depth study and calculation, reveals coiled tubing operations required during major tension with coiled tubing diameter, wall thickness, material properties and the bending radius about. Coiled tubing yield strength, the larger diameter and thicker wall thickness, the greater the tension needed, but the larger the bending radius, the smaller the tension required. And by calculating the results, coiled tubing operations during roll torque required at different layers is constant, it is based on the premise, derived research objectives of this paper are:coiled tubing wound on the drum needs tension within the same level range should be constant tension control.Finally, to achieve the coiled tubing operation through Cheng Zhongheng control system tension control design and virtual simulation, including:(1) Analysis and design of coiled tubing tension control system solutions, the use of PID controllers, electro-hydraulic control method, by the tension sensor tension transmission signal;(2) Combined with control theory, the control system controller and control algorithm are described, combined with the characteristics and requirements of the system, select the appropriate PID controller and associated control algorithms, including PID control parameters tuning method;(3) The control system program has been established for the essential component in the control system are described in detail and selection, and solved the mathematical model for system simulation back to prepare;(4) Combination of coiled tubing tension control system and various elements of the mathematical model consists in Matlab Simulink simulation of the control system for different operating conditions, with or without PID controller, whether PID parameter tuning simulation were analyzed by comparison of simulation results, when the coiled tubing tension constant conditions, allow a certain tension fluctuation range of conditions, coiled tubing tension control system designed to meet the conditions required to achieve the purpose of coiled tubing corresponding conditions of constant tension control and responsive, better system stability. At the same time, PID controller is the essential part of the control system, PID tuning parameters that affect coiled tubing tension control system controls the effect of the key.Coiled tubing tension control system of the present research designed to achieve the basic coiled tubing operations during constant tension control, coiled tubing to guide field operations and enhance the life of coiled tubing has a certain reference value and practical significance.