Numerical Modeling of Dynamic Behavior and Steering Ability of a Bottom Hole Assembly with a Bent-Housing Positive Displacement Motor Under Rotary Drilling Conditions

Chen, Ying‐Jie; Fu, Jianhong; Ma, Tianshou; Tong, Anping; Guo, Zhaoxue; Wang, Xudong

doi:10.3390/en11102568

Cited by 14 publications

(7 citation statements)

References 18 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the basis of the studies of drill string vibration and rockbreaking process, some researchers successfully combine the two to study the application of downhole tools and bottom hole assembly (BHA) (Dong and Chen, 2018a;Chen, et al, 2018). In these studies, the weight on bit (WOB) is applied to the upper end of drill string or the drill bit using an axial force, and the results are more interpretable.…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Liang

Guan

et al. 2021

Front. Earth Sci.

View full text Add to dashboard Cite

Using various tools to obtain downhole data to reach a precise pore pressure model is an important means to predict overpressure. Most downhole tools are connected to the lower end of drill string and move with it. It is necessary to understand the motion state and dynamic characteristics of drill string, which will affect the use of downhole tools. In this paper, a drilling process considering rock-breaking process in vertical wells is simulated using finite element method. In the simulation, gravity is applied to the whole drill string. The contact force between PDC bit and formation is the weight on bit (WOB). And a rotation speed is applied to the upper end of drill string. Analysis of the results shows that the vibration amplitude of bottom hole WOB (contact force between PDC bit and formation, which is the real WOB in drilling process) is bigger than the amplitude of wellhead WOB (acquired through conversion using Hook load, which is on behalf of the WOB obtained on drilling site). Both wellhead WOB and bottom hole WOB decline with a fluctuation in drilling process. In small initial WOB and low rotation speed conditions, the fluctuation of wellhead WOB focuses on low frequency, the fluctuation of bottom hole WOB focus on high frequency, and the phase of them are not identical. In large initial WOB and high rotation speed conditions, the fluctuation of wellhead WOB and bottom hole WOB both become more irregular. As for wellhead torque and bottom hole torque, the fluctuation of them mainly focuses on low frequency. And in high rotation speed conditions, wellhead torque may become negative. The research results are beneficial to the usage of downhole tools.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Liang

Guan

et al. 2021

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Morin and Wilkens [23] reported that the bit tends to be perpendicular to the fracture strike in the drilling process and used the deviation logarithm to describe the trajectory of the borehole in three-dimensional space. Chen et al [24] proposed a bit formation wellbore model for a nonlinear coupled bottom borehole assembly under full screw drilling. Liu et al [25] established a linear elastic model of borehole collapse failure based on pore fluid seepage and obtained the attenuation law for the soft coal seam collapse pressure with gas seepage; the basic mechanical parameters of the coal seam and fluid seepage and the space of the borehole trajectory were also analyzed.…”

Section: Introductionmentioning

confidence: 99%

Deflection Laws of Gas Drainage Boreholes in Interbedded Soft and Hard Seams: A Case Study at Xinzheng Coal Mine, China

Xiao-yan

Cheng

Chen

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Coal and gas outbursts can lead to serious disasters in coal mines. The drilling of boreholes to predrain the gas is an effective measure for preventing such accidents. However, due to the complexity of the geological situation, the drilling trajectory often deviates from the design trajectory, resulting in poor gas extraction. To solve the problem of gas drainage borehole deflection, an analytic hierarchy process (AHP) model is established based on geological factors, technical factors, and human factors. The AHP model is used to rank the weights of various influencing factors, and the analysis is combined with a drilling model and engineering examples. Finally, the results show that soft and hard interlayers are the most important factors affecting the deflection of the borehole. The rock drilling model is mainly affected by the formation forces. The regularity of the change in the azimuth angle during drilling is not obvious when the angle of the encountered layer is less than some critical value. When the borehole is skewed downward, the deflection angle ranges from 0 to 4°, and the deflection of the borehole occurs mainly at the interface of the rock layers. When the angle of the encountered layer is greater than the critical value, the borehole is skewed upward, with a deflection angle of 0–6°, and the deflection occurs at the rock interface. The trajectory curve obtained by theoretical predictions from field data is found to be consistent with that of an actual project.

show abstract

“…e variable diameter stabilizer was developed and applied in the field [11,12]. In order to make the variable diameter stabilizer play a better role in the directional well, the variable diameter stabilizer was used in combination with the positive displacement motor, antiwear and antitorque tool [13][14][15]. However, the compound deflection of variable diameter stabilizer and BAH is seldom applied in the field, and the mechanism and model of the compound deflection are seldom studied in the application process.…”

Section: Introductionmentioning

confidence: 99%

Application of Composite Deflecting Model in Horizontal Well Drilling

Shaohu

Zhu

2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Based on current issues of difficulties in controlling horizontal well trajectory and high cost in drilling deflecting, a compound deflecting BHA (bottom hole assembly) with diameter-adjustable stabilizer (DAS) and bending-adjustable housing (BAH) is presented. According to the DAS operational principles and the stress condition in operation, the computational formula of wedge’s axial moving displacement and piston’s radial telescopic displacement of the DAS driven by drilling fluid pressure is presented. This formula is verified by lab experimental simulation. Three-points-circle method is utilized to calculate geometrical build up rate of compound deflecting BHA, and the result is verified by field data. The method is utilized to make design and calculate for compound BHA. The research can be used as a reference for compound deflecting drilling in horizontal wells. The flow rate and pressure difference have a very serious impact on the flow regulator erosion, so the flow rate and pressure difference should be controlled when the DAS works, and it is suggested that the flow regulator should maintain and replace frequently when in service.

show abstract

Numerical Modeling of Dynamic Behavior and Steering Ability of a Bottom Hole Assembly with a Bent-Housing Positive Displacement Motor Under Rotary Drilling Conditions

Cited by 14 publications

References 18 publications

Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Study on Dynamic Characteristics of Drill String Considering Rock-Breaking Process

Deflection Laws of Gas Drainage Boreholes in Interbedded Soft and Hard Seams: A Case Study at Xinzheng Coal Mine, China

Application of Composite Deflecting Model in Horizontal Well Drilling

Contact Info

Product

Resources

About