Investigation of pipe rocking and agitator effectiveness on friction reduction during slide drilling

Zhang, He; Ashok, Pradeepkumar; Oort, Eric van; Shor, Roman

doi:10.1016/j.petrol.2021.108720

Cited by 15 publications

(2 citation statements)

References 31 publications

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“…There are various explanations for how hydraulic oscillators reduce friction. One suggests that they convert static friction to dynamic friction [13,20], while another suggests that they change the direction of friction [21][22][23]. A third explanation is that vibration helps the drill string overcome tight spots [10].…”

Section: Factors Affecting the Dynamic Effective Traction Forcementioning

confidence: 99%

A Method of Evaluating the Effectiveness of a Hydraulic Oscillator in Horizontal Wells

Zhong,

Li,

Zhao

et al. 2023

Sound&Vibration

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Bent-housing motor is the most widely used directional drilling tool, but it often encounters the problem of high friction when sliding drilling in horizontal wells. In this paper, a mathematical model is proposed to simulate slide drilling with a friction reduction tool of axial vibration. A term called dynamic effective tractoring force (DETF) is defined and used to evaluate friction reduction effectiveness. The factors influencing the DETF are studied, and the tool placement optimization problem is investigated. The study finds that the drilling rate of penetration (ROP) can lower the DETF but does not change the trend of the DETF curve. To effectively work, the shock tool stiffness must be greater than some critical value. For the case study, the best oscillating frequency is within 15∼20 Hz. The reflection of the vibration at the bit boundary can intensify or weaken the friction reduction effectiveness, depending on the distance between the hydraulic oscillator and the bit. The optimal placement position corresponds to the plateau stage of the DETF curve. The reliability of the method is verified by the field tests. The proposed method can provide a design and use guide to hydraulic oscillators and improve friction reduction effectiveness in horizontal wells.

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Section: Factors Affecting the Dynamic Effective Traction Forcementioning

confidence: 99%

A Method of Evaluating the Effectiveness of a Hydraulic Oscillator in Horizontal Wells

Zhong,

Li,

Zhao

et al. 2023

Sound&Vibration

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“…These studies mainly focus on the impact of vibration frequency, vibration load, pressure, and flow rate on the drag reduction effect of hydraulic oscillator. In addition, some researchers conducted research on drag reduction model [16] , vibration mathematical model [17][18] , and friction resistance prediction [19] of hydraulic oscillator. However, the above literature lacks research on the geometric parameters of hydraulic oscillator.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Geometric Parameters on Vibration Characteristics of Hydraulic Oscillator Used in Oil Drilling

Tang,

Zhao,

Zhu

et al. 2024

J. Phys.: Conf. Ser.

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Hydraulic oscillator is an important drilling equipment extensively used in petroleum extraction and drilling work. It generates vibration along the axis direction to drive the drilling tool to drill and the drilling effect largely depends on the axial impulsive loading and frequency of the hydraulic oscillator. However, few present studies have been conducted on the influence of variations in key geometric parameters on axial impulsive loading and frequency of hydraulic oscillators, and systematic analysis is still lacking. Optimization calculations were carried out on throat inner diameter, throat length, nozzle spacing, and nozzle angle of the hydraulic oscillator. The analysis results show that: The overall impact of throat length and nozzle angle changes on axial load is small, while throat inner diameter has the greatest impact on the axial load. The axial load is 375.78 N when throat inner diameter is 10 mm, which is 8 times larger than that when throat inner diameter is 20 mm. Moreover, the throat inner diameter is smaller, both the axial load and amplitude are greater. Nozzle spacing has a significant influence on the axial load within a narrow spacing range. As nozzle spacing increases, the axial load increases overall while the amplitude shows a decreasing trend. Particularly, when nozzle spacing exceeds a certain value, the axial load does not vary significantly.

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Selection of Optimal Well Trajectory Using Multi-Objective Genetic Algorithm and TOPSIS Method

Yavari,

Qajar,

Aadnoy

et al. 2023

Arab J Sci Eng

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This study presents a novel approach for optimizing well paths in extended reach drilling (ERD) wells. Different trajectories can be used for ERD wells, each with its pros and cons. Previous research overlooked certain objective functions in single-objective optimization and lacked an autonomous method for selecting the best solution from Pareto optimal solutions in multi-objective optimizations. Furthermore, they lacked comparing different profiles in well design. Risk assessment and operational factors, which greatly influence optimization and drilling success, were insufficiently considered. This study utilized the multi-objective genetic algorithm (MOGA) and the technique for order preference by similarity to an ideal solution (TOPSIS) method to select the optimal well path based on torque, wellbore length, risk (e.g., keyseat), and required tools. First, all possible trajectories were determined, and MOGA identified the optimal path with minimal torque and length. The fuzzy decision-making method automatically selected the best solution from the Pareto optimal solution set. The associated risks and required tools are evaluated for each trajectory. Finally, the TOPSIS method selected the optimal trajectory based on torque, length, risks, and required tools. The case study demonstrated that the undersection path was the most advantageous trajectory for ERD wells, with a 60% closeness to the ideal state. The multiple build trajectory achieved 57% closeness, while the build and hold and double build paths had lower closeness values (43 and 28%, respectively). Consequently, it can be inferred that in the context of ERD wells, it is preferable to carry out the deviation process at deeper depths.

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Investigation of pipe rocking and agitator effectiveness on friction reduction during slide drilling

Cited by 15 publications

References 31 publications

A Method of Evaluating the Effectiveness of a Hydraulic Oscillator in Horizontal Wells

A Method of Evaluating the Effectiveness of a Hydraulic Oscillator in Horizontal Wells

Study on the Influence of Geometric Parameters on Vibration Characteristics of Hydraulic Oscillator Used in Oil Drilling

Selection of Optimal Well Trajectory Using Multi-Objective Genetic Algorithm and TOPSIS Method

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