The speed control research on rotary valve driven by micromotor in MWD

Zhang, Lingtan; Shen, Yue; Hu, Gaixing; Wei, Lingzhi; Jia, Jia; Sheng, Limin

doi:10.1007/s00542-019-04620-y

Cited by 2 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Valve. e rotary valve, installed in the drill collar above drill bit, is composed of stator and rotor, in which there exist the same numbers of holes and blades [12,13]. When the rotor rotates relative to the stator, the hole in the rotor is relative to the stator hole.…”

Section: E Load Torque Of Rotarymentioning

confidence: 99%

“…During the movement, a valve hole with a variable flow area is formed, and the upper part of the valve hole produces a change in the pressure of the drilling fluid, which is transmitted to the wellhead in a fluctuating manner, and the voltage pulse formed by the MWD data quickly changes the speed of the rotary valve to modulate the pressure of the drilling fluid which can realize the upload of underground information. e rotary valve rotor is driven by a motor through a reducer [12,13].…”

Section: E Load Torque Of Rotarymentioning

confidence: 99%

“…According to torque balance equation of electrical motor [13][14][15][16], the mathematical model of the speed control of rotary valve can be written as…”

Section: Analysis Of Load Torque Effect On Rotary Valve Speedmentioning

confidence: 99%

“…In equation ( 4), a new variable V, used as given angular acceleration, is introduced and defined as V � (K e U/2πr m Jk n ) − (M r (θ)/Jk 2 n ). en, the linear equation of rotational speed becomes [13]…”

Section: Open-loop Speed Control Of Rotary Valve Based Onmentioning

confidence: 99%

“…To make sure the rotary valve speed can track the change of phase-modulated pulse and suppress the interference strongly, the closed-loop PID control system, generated by rotation speed feedback of linearized openloop speed control system, is introduced, and PID controller is added in forward channel of V(s) serially to realize the real-time adjustment and to enable the rotary valve speed reach the set value quickly and suppress the interference [19,20], as the block diagram shows in Figure 2 [13].…”

Section: Control Modelmentioning

confidence: 99%

See 4 more Smart Citations

Rotation Speed Control of the Rotary Valve in MWD Tools Based on Speed Feedforward Compensation

Zhang

Shen

Wang

et al. 2021

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

The rotary valve speed control, seriously affected by the nonlinear characteristic of rotary valve load torque, affects the generation of drilling fluid pressure phase shift keying (PSK) signal and its quality. The calculation model feedforward of the load torque acts on the speed control system and enables the motor voltage to change according to the law of calculation model, and the linearization correction of the speed system is performed. Additionally, the flow measurement is introduced into the calculation model of the load torque to track the load torque change with the flow, suppressing the influence of large changes in flow rate on open-loop control of rotary valve speed. The closed-loop proportional-integral-derivative (PID) control is formed by negative feedback of speed, and the PID parameter value rule is established based on the rapid decay control of transient component in the rotary valve speed step response, which speeds up the tracking of the rotary valve speed following the control voltage pulse and reduces the distortion of the drilling fluid pressure PSK signal, increasing the frequency of the drilling fluid pressure carrier and improving the transmission rate of downhole information. Simulink simulation indicates that the closed-loop PID control of rotary valve speed can track the change of control voltage pulse quickly and strongly suppress the interference influences from flow measurement error and load torque calculation model deviation.

show abstract

Section: E Load Torque Of Rotarymentioning

confidence: 99%

Section: E Load Torque Of Rotarymentioning

confidence: 99%

“…According to torque balance equation of electrical motor [13][14][15][16], the mathematical model of the speed control of rotary valve can be written as…”

Section: Analysis Of Load Torque Effect On Rotary Valve Speedmentioning

confidence: 99%

Section: Open-loop Speed Control Of Rotary Valve Based Onmentioning

confidence: 99%

Section: Control Modelmentioning

confidence: 99%

See 3 more Smart Citations

Rotation Speed Control of the Rotary Valve in MWD Tools Based on Speed Feedforward Compensation

Zhang

Shen

Wang

et al. 2021

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

A Review of Communication Technologies in Mud Pulse Telemetry Systems

Li,

2023

Electronics

View full text Add to dashboard Cite

Mastering real-time and accurate downhole information is crucial for ensuring drilling safety, improving drilling efficiency, and maximizing economic benefits. In recent years, logging while drilling (LWD) technologies, represented by mud pulse telemetry (MPT), achieved significant success. However, they still face challenges such as a large amount of downhole information conflicting with low information transmission rates, severe channel distortion, strong noise interference, and weak surface receiving signals. Therefore, this review collects and updates the papers, patents, and conference articles in the relevant field over the past ten years. Starting from the basic structure of communication systems, the downhole signal coding and modulation technologies of the MPT system are discussed. The attenuation reflection brought by the mud channel and various noise interferences in the system are described. The surface noise cancellation, channel equalization, synchronization, and decoding are studied in detail. By analyzing the theoretical principles, development breakthroughs, and relevant challenges that can improve the development of LWD technologies, this review aims to assist researchers in the field in obtaining the latest references and strategies.

show abstract

The speed control research on rotary valve driven by micromotor in MWD

Cited by 2 publications

References 12 publications

Rotation Speed Control of the Rotary Valve in MWD Tools Based on Speed Feedforward Compensation

Rotation Speed Control of the Rotary Valve in MWD Tools Based on Speed Feedforward Compensation

A Review of Communication Technologies in Mud Pulse Telemetry Systems

Contact Info

Product

Resources

About