Fully Mechanical Vertical Drilling System Delivers RSS Performance in Vertical Drilling Applications While Providing an Economical Alternative to Conventional Rotary Steerable Systems Set-Up for Vertical Hold Mode

Jones, Steve; Feddema, Chad; Castro, Juan; Sugiura, Junichi

doi:10.2118/178788-ms

Cited by 16 publications

(10 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the well deviation angle is small, the eccentric moment of the eccentric block is always less than the friction torque of the plate valve, and there is no intersection point between the parabola and the x-axis. At this time, the real number solution of the critical deflection angle cannot be obtained by Equation (10). There is no deceleration area in the circumferential direction, and the eccentric block will rotate clockwise in one direction.…”

Section: Tool Face Angle Modelmentioning

confidence: 99%

“…Compared with the EVDS, the MVDS has a relatively low deviation control accuracy, but it possesses a simple structure without any electronic components, which can reduce the sealing requirements of drilling tools. In addition, the MVDS has many advantages, such as low manufacturing cost, high reliability, high temperature resistance, and greater impact resistance [9,10]. Therefore, the MVDS has a better application prospect in the future and the key problem we are facing is the improvement of its deviation correction performance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Integral Modeling for Deviation Correction Trajectory of the Mechanical Vertical Drilling System

et al. 2021

View full text Add to dashboard Cite

The deviation correction trajectory of the mechanical vertical drilling system (MVDS) is very important because it is the final embodiment of performance. However, it is impossible to obtain it at the design stage, except when using simulation methods. In this paper, tool face angle model and other theoretical models were established, respectively, and the trajectory simulation method was created through model coupling. Next, the method was used to simulate the trajectory of MVDS under two typical working conditions. The results indicate that the critical deviation angle is the deviation control accuracy of the MVDS. The existence of critical deflection angle makes MVDS correct deviation and change azimuth at the same time, resulting in the trajectory being a three-dimensional curve, which has the tendency of drifting to the left. Furthermore, the deviation and azimuth change rate are constantly changing in the process of drilling. The results also show that the MVDS is unable to correct the horizontal displacement of the downhole. The proposed method and analysis results are helpful to find out and solve the problem of the current design as soon as possible, and to provide guidance for the subsequent structure optimization.

show abstract

Section: Tool Face Angle Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integral Modeling for Deviation Correction Trajectory of the Mechanical Vertical Drilling System

et al. 2021

View full text Add to dashboard Cite

show abstract

“…More important, the all-metal structural design can withstand higher temperatures and high temperature environments such as ultra-deep wells and vertical wells with abnormal geothermal gradients. So, it becomes the only way to achieve active correction during drilling in high temperature and ultra-deep wells [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics and Key Parameter Optimization of Mechanical Automatic Vertical Drilling Tools

Wang

Liu

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

Mechanical automatic vertical drilling tools (MAVDT) have gradually gained attention as a drilling tool that can achieve active correction in harsh working environments such as high temperature and high pressure. The gravity sensing mechanism can sense the deviation and convert the deviation signal into the control signal to drive the actuator to correct the deviation. It is the core component of the mechanical automatic vertical drilling tool. This paper analyzes the force on the gravity sensing mechanism based on the structural analysis of the mechanical automatic vertical drilling tool. Then, the general dynamic equation of the gravity sensing mechanism is established based on D’Alembert principle. The critical response position where the acceleration value is zero is used as the research object to complete the preliminary design and analysis of the sensing mechanism. Through analysis, it can be found that there is a conflict between the response accuracy and control stability of the gravity sensing mechanism. High response accuracy often means poor control stability. For the gravity sensing mechanism with definite structural parameters, there is a limit value of the allowable friction coefficient. When the friction coefficient of the thrust bearing exceeds the limit value, the gravity sensing mechanism cannot achieve the inclination response no matter how big the inclination angle and deflection angle are. The friction coefficient between the disc valves and the force between the disc valves of the gravity sensing mechanism have a linear effect on the performance of the mechanism, and the smaller the deviation angle, the greater the influence coefficient of the force or the friction coefficient between the disc valves on the length of the gravity sensing mechanism. During the process of dynamic swing, the dynamic stable position of the gravity sensing mechanism is related to the relative relationship between the restoring force of the mechanism and the friction damping. To be precise, it is related to the potential energy zero point and the speed zero point during the gravity sensing mechanism swing process before it reaches the dynamic stable position.

show abstract

“…However, the drilling industry have to face the reality of low oil and gas prices in present, drilling costs needed to be reduced further. 7 The development of fully mechanical vertical drilling tool (MVDT) was perfectly adapted to the current economic situation. MVDT has the following advantages: (a) low costs due to its fully mechanical structure, (b) high temperature resistance, (c) high suitability and reliability without electric components, and (d) high bearing capacity for larger weight on bit (WOB) and rate of penetration (ROP).…”

Section: Introductionmentioning

confidence: 99%

“…(c) Eccentric block-locate the mud control valve through holding itself on lower side of borehole due to gravity. 7 The eccentric block is mounted on outer cylinder using bearings, by which the eccentric block could freely rotate around its axle. An upper plate valve is rigid connected with the eccentric block, and there is an opening opposite to the eccentric block.…”

Section: Introductionmentioning

confidence: 99%

The dynamics of eccentric block in a fully mechanical vertical drilling tool under the effect of torsional vibration

Xue

Liu

et al. 2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

In present, the drilling industry have to face the reality of low oil and gas prices, fully mechanical vertical drilling tool is likely to become the best choice for vertical drilling in the future. Without electric measurement and control system, the mechanical vertical drilling tool has a mechanically stable platform with gravity sensitivity. The stable platform included an eccentric block which is not only sensitive to gravity but also severely affected by torsional vibration. In this article, we reveal the dynamics of eccentric block under the effect of torsional vibration, which is the key element of the well deviation control accuracy in mechanical vertical drilling tool. The dynamic model of eccentric block is established using Lagrangian equation and Coulomb friction, and the law of dynamic characteristics under the effect of different amplitudes and period of torsional vibration is found. The results show that, with the deviation angle and eccentric torsion moment of eccentric block is increased, the resistance to torsional vibration increases. While the frequency of torsional vibration decreases, a subordinate period gradually appears after the rotation speed value of v is less than 1 rad/s, the torsional vibration with large amplitude and high frequency is detrimental to the stability of the eccentric block. In addition, the largest Lyapunov exponent is estimated using the time series of simulation, the dynamics of eccentric block under the effect of torsional vibration can be switched four types, and the maximum and minimum values of largest Lyapunov exponent are 3.99 3 10 22 and 22.98 3 10 22 , which means with the state of torsional vibration changes and the response of eccentric block would be transformed to chaos.

show abstract

Fully Mechanical Vertical Drilling System Delivers RSS Performance in Vertical Drilling Applications While Providing an Economical Alternative to Conventional Rotary Steerable Systems Set-Up for Vertical Hold Mode

Cited by 16 publications

References 4 publications

Integral Modeling for Deviation Correction Trajectory of the Mechanical Vertical Drilling System

Integral Modeling for Deviation Correction Trajectory of the Mechanical Vertical Drilling System

Dynamic Characteristics and Key Parameter Optimization of Mechanical Automatic Vertical Drilling Tools

The dynamics of eccentric block in a fully mechanical vertical drilling tool under the effect of torsional vibration

Contact Info

Product

Resources

About