Horizontal Drilling with Dual Channel Drill Pipe

2017 ◽  
Author(s):  
O. M. Vestavik ◽  
J. Thorogood ◽  
E. Bourdelet ◽  
B. Schmalhorst ◽  
J. P. Roed
Keyword(s):  
Drill Pipe ◽  
Horizontal Drilling ◽  
Dual Channel

scholarly journals Study on the Mechanical Extended-Reach Limit Prediction Model of Horizontal Drilling with Dual-Channel Drillpipes

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7732
Author(s):  
Tianyi Tan ◽  
Hui Zhang
Keyword(s):  
Prediction Model ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
Outer Diameter ◽  
Horizontal Section ◽  
Horizontal Drilling ◽  
Drag Model ◽  
Dual Channel ◽  
Drilling Method ◽  
Conventional Drilling

Extended-reach horizontal wells are critical for the development of unconventional reservoirs. Dual-channel drill pipe drilling has a great advantage in improving the horizontal section length, while the research on its mechanical extended-reach limit prediction model is insufficient. In this paper, the torque and drag model is built considering the additional axial force of the sliding piston on the dual-channel drillpipe. Based on the torque and drag model, the mechanical extended-reach limit model for dual-channel drilling is established. A case study including a comparison to the conventional drilling method and sensitivity analysis is conducted. The result shows that under the same conditions, the mechanical extended-reach limit of the dual-channel drilling method is 10,592.2 m, while it is 9030.6 m of the conventional drilling method. The dual-channel drilling method achieves a further mechanical extended-reach limit than the conventional drilling method. To improve the mechanical extended-reach limit of dual-channel drilling, a higher back pressure on the sliding piston, a deeper measured depth of the sliding piston, a higher density of the passive drilling fluid, a smaller outer diameter of the outer pipe, a lower weight on bit and rate of penetration should be adopted. The work in this paper completes the extended-reach limit theory of dual-channel drilling, providing a guide for better use in unconventional reservoir development.

Numerical Investigations on the Effect of a Cuttings Bed Remover on the Cuttings Carrying Capacity in Horizontal Drilling

2019 ◽  
Author(s):  
Tong Cao ◽  
Kaian Yu ◽  
Xuyue Chen ◽  
Hongwu Zhu ◽  
Yunqing Luo ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Drill Pipe ◽  
Flow Characteristics ◽  
3D Models ◽  
Design Parameters ◽  
Deviation Angle ◽  
Bottom Edge ◽  
Horizontal Drilling ◽  
Helical Angle ◽  
Cuttings Bed

Abstract With the increasing development of the exploration of unconventional oil-gas resources, people pay more and more attention to horizontal drilling technology. During the process of horizontal drilling, when the deviation angle exceeds the critical value, the falling velocity of the cuttings in annulus will increase with the deviation angle and they are more inclined to slip to the bottom edge. If the drilling parameters are chosen improperly at the same time, the cuttings would be deposited to form a cuttings bed at the bottom edge of the annulus. The high friction and high torque caused by the cuttings bed could greatly reduce the efficiency and the safety of drilling. This paper comes up with a cuttings bed remover with helical grooves to break the cuttings bed and carry cuttings based on the normal drill pipe design, builds 3D models of the cuttings bed removers with different structure parameters to analyze the cuttings carrying capacity with CFD. In addition, an investigation about the effects of the grooves design and drill pipe rotational speed have on the cuttings carrying capacity is accomplished, the grooves design parameters include the number, the length and the helical angle of the groove, and the effects are evaluated by the flow characteristics of fluid field and transportation of cuttings. The remover structure is optimized according to the simulation results, and the good performance of cuttings bed remover is verified by a field test. The whole research about the promotion of cuttings bed remover and its application shall be of great importance to the improvement of horizontal drilling efficiency and safety.

Numerical Analysis of Cuttings Accumulation Tendency in Horizontal Annulus at Different Drilling Conditions

2021 ◽  
Author(s):  
Golam Rasul ◽  
Mohammad Azizur Rahman ◽  
Stephen Butt
Keyword(s):  
Pressure Drop ◽  
Multiphase Flow ◽  
Flow Rate ◽  
Rotational Speed ◽  
Numerical Study ◽  
Drill Pipe ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Horizontal Drilling ◽  
Drilling Conditions

Abstract The influence of rotational speed and eccentricity of the drill pipe as well as the effect of fluid flow rate on the accumulation of cuttings in the horizontal annulus are the focus of this study. Computational Fluid Dynamics (CFD) is utilized to model a horizontal annulus section which conveys solid-liquid two-phase flow at different drilling conditions. In this numerical study, the Eulerian multiphase flow model has been adopted for solidliquid characteristics analysis. Here the basic continuity and momentum equations have been considered, which have further been reduced to solve the conservation of mass and momentum equations with appropriate boundary and initial conditions. The study has considered the transient, turbulent model (k-epsilon) with no-slip conditions at pipe walls as well as velocity inlet and pressure outlet at the boundaries. The result indicates the clear impact of rotational speed on the cuttings removal process in the horizontal annulus section. As the rotational speed of the drill pipe increases, the cuttings concentration drops down significantly in the annulus section. Around 20% less accumulation is noticed if the drill pipe rotation is increased from 0 RPM to 120 RPM, which happens due to momentum created by the rotation that does not allow the particles to be accumulated. The eccentricity has a significant impact on solid accumulation as well. However, with increased flow rate and eccentricity, the pressure across the annulus section drops substantially. The difference in pressure drop is noticed as much as around 61 Pa/m with the flow rate change. Consequently, a higher pressure drop per length for the higher velocity of fluid implies higher pumping power consumption. The findings from this study may help to understand the optimum operating conditions for horizontal drilling. The effects of drilling conditions are identified and the complex multiphase flow in the annulus is modeled that could be extended to further related studies.

scholarly journals Optimization of Drillstring Design to Produce More Stable Dynamic Drilling on Horizontal Drilling by Applying Different Stiffness Combinations

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Dundie Prasetyo ◽  
Ratnayu Sitaresmi ◽  
Suryo Prakoso
Keyword(s):  
Data Acquisition ◽  
Oil And Gas ◽  
Drill Pipe ◽  
Drill String ◽  
Drilling Process ◽  
Directional Drilling ◽  
Horizontal Section ◽  
Stick Slip ◽  
Horizontal Drilling ◽  
Drilling Operation

<p>Horizontal drilling technique is one of the methodologies that have been widely implemented recently to improve the production of oil and gas wells. Several directional drilling technologies can be utilized to drill the horizontal wells, vary from the simple mud motor technology to Bottom Hole Assembly (BHA) with the advanced motorized rotary steerable system. The most common challenges that are faced on horizontal drilling process are on the torque and the stick-slip throughout drilling process, which can be a technical limiter for the length of horizontal section that would be achieved. Stick-slip is the vibration <br />that occurs due to cyclical rotation acceleration and deceleration of the bit, BHA or drill string. This speed fluctuation can be zero to rate of penetration (ROP) or far in excess of twice the rotational speed measured at the surface. Stick-slip can significantly decrease the ROP, increases tool failures and damage, affects borehole quality, and impacts the data acquisition. Several studies had been done on the stick-slip prevention and mitigation throughout creation of new technology and drilling parameters envelope throughout drilling operation, however no study has ever been done on the modification of the design and <br />arrangement of the BHA itself to produce more stable BHA. Drill pipe is the longest component of the drill string and hence it has biggest contribution towards the drill string dynamic. This study will focus on the analysis of the combination of several designs of the drill-pipe and heavy weight drill-pipe (HWDP) that has different stiffness and characteristic to produce less <br />vibration, more efficient drilling operation and to create zero impact on the data acquisition measured while drilling. FEA drilling dynamic simulator was used to optimize the drill sting configuration. The calculation is made from the depth of 750 m to 2801 m. Based on the drilling simulation results of FEA modeling, it is concluded that the minimum stiffness ratio to give stability of the drill string of Well-Z7 BHA and Well-Z6 BHA is 0.012175272 and 0.07366999, respectively.</p>

Experimental Evaluation of the Lateral Contact Force in Horizontal Wells

2000 ◽  
Vol 122 (3) ◽  
pp. 123-128 ◽  
Author(s):  
Alexander Martinez ◽  
Stefan Miska ◽  
Ergun Kuru ◽  
James Sorem
Keyword(s):  
Contact Force ◽  
Drill Pipe ◽  
Analytical Models ◽  
Directional Drilling ◽  
Frictional Drag ◽  
Horizontal Drilling ◽  
Coiled Tubing ◽  
Lateral Contact ◽  
Helical Pipe ◽  
Extended Reach Drilling

In horizontal and extended reach drilling, a large frictional drag may occur. If the pipe buckles laterally or into a helical shape, additional lateral contact force, LCF, is developed between the pipe and the wellbore wall, increasing the drag force. This paper presents the results of an experimental study of the lateral contact force between the drill pipe and the wellbore wall, for helical pipe configuration. Comparison of the experimental results with the current analytical models is also presented. A horizontal well was simulated using a 2-in-dia hole, 86-ft long, and three different sizes of pipe. Two different techniques were used to measure the lateral contact force. Results from both techniques seem to be in good agreement. The comparison with the current analytical models shows that higher values are predicted. The results will find application in directional drilling, horizontal drilling, and coiled tubing operations. [S0195-0738(00)00603-8]

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