A Review of the Evaluation, Control, and Application Technologies for Drill String Vibrations and Shocks in Oil and Gas Well

Table 7

Comprehensive comparative analysis of drill string V&S control methods.

Classification	Method/mechanism	Advantages	Disadvantages	Technologies	Adapt the form
					Transverse/; lateral	Axial/; longitudinal	Torsional/; rotational
Passive control	Prevent resonance	The earliest, the most commonly used, mainly considering the inherent characteristics of drill string, fast calculation, can avoid the vibration mode	Model is simplified, the control of drill string structure optimization is limited	Adjust RPM, drilling fluid lubrication	√	√	√
				Adjust WOB	√	/	√
	Change energy distribution	The most common, mainly considering the boundary conditions of the drill string system economic and effective, simple and feasible, mature technology	The contact between tools and borehole wall will increase the friction of the drill string torque, reduce drill string extension ability and the drilling efficiency	Roller stabilizer/double core bit/reamer/DOC bit
				Variable diameter/near-bit/V stabilizer/fairing/spiral stripes	√	/	/
				Hybrid bit	/	√	√
	Absorber	The most effective and simple device, economy	Control ability is limited, tool is easy to damage	Axial/AST shock absorber
Active; control	Whole drill string closed loop	Good simulation result	It is hard to get accurate underground data, calculation is complex, and hardware development is difficult	μ//PID/PI/GA	√	/	√
	Wellhead closed loop	Fast response and low cost	Transmission rule of vibration signal is unknown	Transmission wave decomposition	/	/	√
	Whole drill string open loop	Reduce drill string vibration by control RPM	System response time is long, calibration is difficult	Soft torque rotation system
Semiactive control	Semiactive varied damper	Control precision, high energy utilization, being better than active control and passive control	Control system research and development is difficult and expensive, belongs to the strongly nonlinear control	The magnetic fluid damper	/	√	√