A New, Integrated, Wireline-Steerable, Bottom Hole Assembly Brings Rotary Drilling-Like Capabilities to Coiled Tubing Drilling

1997 ◽  
Author(s):  
D.R. Anderson ◽  
Alain Dorel ◽  
Roy Martin
Keyword(s):  
Rotary Drilling ◽  
Coiled Tubing ◽  
Bottom Hole ◽  
Bottom Hole Assembly

Calculation Methods of Orienter Torque and Drag in Coiled Tubing Drilling

2014 ◽  
Vol 1065-1069 ◽  
pp. 2049-2052
Author(s):  
Liang Hu ◽  
De Li Gao
Keyword(s):  
Static Friction ◽  
Maximum Output ◽  
Force Analysis ◽  
Viscous Forces ◽  
Coiled Tubing ◽  
Bottom Hole ◽  
Weight On Bit ◽  
Bottom Hole Assembly ◽  
The Impact ◽  
The Relationship

Hydraulic orienter has been widely used to alter the drilling direction downhole in coiled tubing drilling. A problem is encountered in construction field. When torque and drag of bottom hole assembly (BHA) are over the maximum output torque of orienter, This caused that it difficult to orient. Therefore, we need to calculate the maximum torque and drag in the process of orientation, it can provide a theoretical basis for designing and selecting the hydraulic orienter. Compared with the conventional force analysis, this paper additionally considered the case of zero weight on bit (WOB), the impact of the mud viscous forces and the relationship between dynamic and static friction, so that we can get more precise result of force analysis.

scholarly journals An Experimental Study of Flow Behavior of Coiled Tubing Drilling System

2014 ◽  
Vol 6 ◽  
pp. 935159 ◽  
Author(s):  
Feng Guan ◽  
Weiguo Ma ◽  
Yiliu Tu ◽  
Chuanxi Zhou ◽  
Ding Feng ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Partial Pressure ◽  
Engineering Practice ◽  
Straight Tube ◽  
Curvature Ratio ◽  
Pressure Losses ◽  
Coiled Tubing ◽  
Bottom Hole ◽  
Bottom Hole Assembly ◽  
Drilling System

Coiled tubing drilling has become an important development direction of drilling. The method of combining theoretical calculation with the experimental verification is adopted to analyze the flow of the coiled tubing drilling system. A set of experimental bench is developed, three kinds of curvature ratio of coiled tubing are used, and the frictional pressure losses of coiled tubing and partial pressure drop of each downhole tool are tested. The results of experiments with water agree well with rough pipe calculation model. The pressure losses of coiled tube are obviously larger than that of straight tube, and the value of it is about 11–17%. The larger the curvature ratio is, the more the pressure losses of coiled tubing are. The fluid experiment with the polymer presents obviously the drag reduction effect. Experiment of simulated bottom hole assembly shows that partial pressure drop of bottom hole assembly is large. It has a little effect on the pressure losses of coiled tubing when whole bottom hole assemblies are connected. The research results can be used as the basis for formulating coiled tubing drilling process parameters, which will provide a guide for engineering practice.

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

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2568 ◽  
Author(s):  
Yingjie Chen ◽  
Jianhong Fu ◽  
Tianshou Ma ◽  
Anping Tong ◽  
Zhaoxue Guo ◽  
...  
Keyword(s):  
Dynamic Stress ◽  
Impact Force ◽  
Axial Loading ◽  
Drill Bit ◽  
Deviation Angle ◽  
Rotary Drilling ◽  
Positive Displacement ◽  
Bottom Hole ◽  
Bottom Hole Assembly ◽  
The Impact

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.

scholarly journals Modeling and Experimental Study on Motion States of Laboratory-Scale Bottom Hole Assembly in Horizontal Wells

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 925
Author(s):  
Wei Li ◽  
Genlu Huang ◽  
Hongjian Ni ◽  
Fan Yu ◽  
Wu Jiang
Keyword(s):  
Numerical Simulation ◽  
Similarity Criterion ◽  
Horizontal Wells ◽  
Circular Motion ◽  
Rotary Drilling ◽  
Circular Arc ◽  
Bottom Hole ◽  
Drilling Engineering ◽  
Bottom Hole Assembly ◽  
Simulation Results

Motion states of bottom hole assembly (BHA) have a great effect on the trajectory control and drilling efficiency while rotary drilling. In order to study the motion states of BHA in horizontal wells, a BHA dynamic model with the finite element method was established. Meanwhile, an indoor experimental setup based on similarity criterion was designed and built to verify the numerical simulation results. Finally, the effects of measuring positions, rotate speeds, weight on bit (WOB), and friction coefficients on the motion states were analyzed in numerical simulation and experiment. The results show that the experimental results can match well with the numerical simulation results. The motion states of BHA in horizontal wells can be divided into three kinds, including circular arc swing, "8" shape swing, and dot-like circular motion. The circular arc swing mainly appears at middle section of BHA and occurs through the collective result of gravity and tangential friction. The dot-like circular motion mainly appears at near-bit or near-stabilizer area because drill bit and stabilizer can steady the BHA at the center part of the wellbore. The "8" shape swing mainly appears at the crossed area and occurs through collective disturbance of the other two motions. Moreover, rotate speed and friction coefficient have promotions on the lateral vibration while WOB have a much smaller effect. Through analyses, related suggestions are given for the drilling engineering. The related conclusions and suggestions in this paper can help to further understand the lateral dynamic characteristics of BHA in horizontal wells and select suitable parameters for drilling engineering.

Bottom Hole Assembly Design Enhancement Successfully Eliminate Hole Problems and Reduce Significant Drilling Time : South S Field Case Study

2020 ◽  
Author(s):  
Y. D. Mulia
Keyword(s):  
Contact Area ◽  
Cost Savings ◽  
Assembly Design ◽  
Drilling Performance ◽  
Bottom Hole ◽  
Unconsolidated Sand ◽  
Bottom Hole Assembly ◽  
Drilling Parameter ◽  
Drilling Time

For S-15 and S-14 wells at South S Field, drilling of the 12-1/4” hole section became the longest tangent hole section interval of both wells. There were several challenges identified where hole problems can occur. The hole problems often occur in the unconsolidated sand layers and porous limestone formation sections of the hole during tripping in/out operations. Most of the hole problems are closely related to the design of the Bottom Hole Assembly (BHA). In many instances, hole problems resulted in significant additional drilling time. As an effort to resolve this issue, a new BHA setup was then designed to enhance the BHA drilling performance and eventually eliminate hole problems while drilling. The basic idea of the enhanced BHA is to provide more annulus clearance and limber BHA. The purpose is to reduce the Equivalent Circulating Density (ECD,) less contact area with formation, and reduce packoff risk while drilling through an unconsolidated section of the rocks. Engineering simulations were conducted to ensure that the enhanced BHA were able to deliver a good drilling performance. As a results, improved drilling performance can be seen on S-14 well which applied the enhanced BHA design. The enhanced BHA was able to drill the 12-1/4” tangent hole section to total depth (TD) with certain drilling parameter. Hole problems were no longer an issue during tripping out/in operation. This improvement led to significant rig time and cost savings of intermediate hole section drilling compared to S-15 well. The new enhanced BHA design has become one of the company’s benchmarks for drilling directional wells in South S Field.

BENDING OF COILED TUBING AT THE BOTTOM HOLE AND THE WELLHEAD

2019 ◽  
pp. 21-23
Author(s):  
A.V. Matsko ◽  
◽  
V.T. Lukyanov ◽  
V.Yu. Bliznyukov ◽  
Keyword(s):  
Coiled Tubing ◽  
Bottom Hole
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