A finite element model for analyzing horizontal well BHA behavior

Akgun, F.

doi:10.1016/j.petrol.2003.12.005

Cited by 17 publications

(13 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the complicated loads and movement of the drill-string in the downhole borehole, finite element modelling still cannot absolutely simulate the real downhole environments for drill-strings. Therefore, basic assumptions were made as follows [25][26][27][32][33][34][35]: the BHA was regarded as a slender beam; the geometry of the wellbore cross-section is circular and the wellbore collapse is ignored; the BHA is located in the center of the borehole at the initial moment; the influence of drilling fluid in the annulus is involved, but the drilling fluid flow is ignored; and the changes in the cross area between the drill pipe and joint are ignored, i.e., each section of the drill-string is regarded as a rod.…”

Section: Dynamic Theorymentioning

confidence: 99%

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

et al. 2018

Energies

View full text Add to dashboard Cite

Fully rotary drilling is one of many useful technologies used for the exploitation of petroleum and geothermal resources, but fully rotating drill-strings are extremely complicated. Therefore, according to the Hamilton principle, a non-linear coupled bottom hole assembly (BHA)-bit-formation-wellbore model is proposed for BHAs with bent-housing positive displacement motor using the finite element method to investigate the dynamic behavior and steering ability under fully rotary drilling. The impact force, acceleration, axial loading, torque, and dynamic stress were simulated, and factors influencing the dynamic steering forces were investigated. The results indicate that the impact force, acceleration, axial loading, torque, and dynamic stress under fully rotary drilling are much higher than under conventional drilling. The numerical simulation and field test in well B confirmed that the rotation of the drill-string is conducive to the hold-on of the deviation angle. With the increase in the weight-on-bit, bend angle, and stabilizer height, the deflecting force on a drill bit increases. Conversely, with the increase in stabilizer diameter, the deflecting force on the drill bit decreases; the lower the deflecting force, the better the effectiveness of hold-on. With increasing deviation angle, the deflecting force on the drill bit first decreases and then increases. The present model can provide a theoretical basis for wellbore trajectory control and optimization design of BHA.

show abstract

Section: Dynamic Theorymentioning

confidence: 99%

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

et al. 2018

Energies

View full text Add to dashboard Cite

show abstract

“…The general formulations of direct and inverse problems of deformation of the curved rods were presented in [9] [10] [11]. The applied aspects of this problem were considered in [12] [13].…”

Section: Statement Of Problems About Elastic Bending Of the Drill Strmentioning

confidence: 99%

Elastic Bending Deformation of the Drill Strings in Channels of Curve Wells

Musa¹

2017

MME

View full text Add to dashboard Cite

The problem about identification of elastic bending deformation of a drill string in a curve wells based on the theory of flexible curved rods and the direct inverse problems of drill string bending in the channels of curvilinear bore-holes is stated. The problem is solved which determines the resistance forces and moments during performing ascending-descending operations in curvilinear bore-holes with trajectories of the second order curve shapes. The sensitivity of the resistance forces relative to geometric parameters of the bore-hole axial line trajectories is analyzed.

show abstract

“…And then Tang, et al [9] derived the relation between the bit lateral steering force and its influencing parameters with this method aiming at push-the-bit RSBHA. Akgun & Apostal [10] and Panayirci, et al [11] used the beam finite element model to estimate the bit lateral force. Note that the bit lateral force calculated above is a static value neglecting the effects of dynamic factors.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristic analysis on the bit lateral steering force of push-the-bit rotary steerable bottom hole assembly

Wang¹,

Guan²,

Zhao³

2018

Math. models, eng.

View full text Add to dashboard Cite

A dynamic finite element model was established to characterize the motion state of the rotary steerable bottom hole assembly (RSBHA). Then the steering lateral force on bit was obtained after the motion equation was solved. The relation between the bit steering force and the pads offset pointing towards the high side direction of the borehole was gotten and the effects of the rotary speed on the bit lateral steering force were analyzed. Results showed that the near-bit stabilizer would contact the wellbore wall with the increasing of the pads offset, resulting in an inflection point presenting on the relation curve between the bit inclination force and the pads offset value. The larger pads offset value was, the more concentrated bit side cutting would be. Rotary speed had a small effect on time average of the bit lateral steering force but could enlarge the action range on both sides of the high side direction of the borehole.

show abstract

A finite element model for analyzing horizontal well BHA behavior

Cited by 17 publications

References 1 publication

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

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

Elastic Bending Deformation of the Drill Strings in Channels of Curve Wells

Dynamic characteristic analysis on the bit lateral steering force of push-the-bit rotary steerable bottom hole assembly

Contact Info

Product

Resources

About