Finite Element Analysis of Flow Field in Drill Bit Design for Gas-Lift Drilling

2021 ◽  
Vol 143 (11) ◽  
Author(s):  
Yi Luo ◽  
Boyun Guo ◽  
Liehui Zhang ◽  
Dong Xiao
Keyword(s):  
Finite Element ◽  
Flow Field ◽  
Power Balance ◽  
Drill Bit ◽  
Hole Cleaning ◽  
Gas Drilling ◽  
Flow Stagnation ◽  
Reverse Circulation ◽  
Flow Power ◽  
Gas Lift

Abstract The hole cleaning issue in gas-lift drilling has been a concern and has not been previously investigated due to the difficulties of experimental studies and analytical modeling. The objective of this study is to deliver an assessment of hole cleaning capacity of drilling fluid in reverse circulation conditions for different bit designs. We use the finite element method (FEM) to target this issue and address a critical question in gas-lift drilling. The result of the theoretical investigation indicates that clean bottom hole can be achieved in gas-lift drilling through optimization of drill bit design to balance fluid energy (cleaning power) between tooth blades. Three drill bit designs were investigated in this study. The flow power balance between blades can be achieved with a 3-orifice bit design and a 2-orifice bit design, but there exist flow stagnation zones between these orifices, which are not desirable for bit tooth and borehole cleaning. The 1-orifice bit design with four cutter blades can eliminate flow stagnation zone and improve flow field to achieve a much better flow power balance between blades and thus bit tooth and borehole cleaning. Therefore, drill bits with one orifice are desirable for reverse circulation gas-drilling. This paper presents a novel technique of using FEM to evaluate bit hydraulics for hole cleaning in reverse drilling conditions. Future laboratory tests are desirable to obtain real data for further validating the model result.

Analytical and Numerical Simulation of Asymmetric Converging Flow of Gas under Drill Bits in Reverse Circulation Gas Drilling

2021 ◽  
pp. 1-11
Author(s):  
Xu Yang ◽  
Boyun Guo ◽  
Tamaralayefa Timiyan
Keyword(s):  
Numerical Model ◽  
Analytical Model ◽  
Gas Flow ◽  
Relative Difference ◽  
Structure Design ◽  
Drill Bit ◽  
Drill Cuttings ◽  
Gas Drilling ◽  
Reverse Circulation ◽  
Converging Flow

Abstract Reverse circulation gas drilling has been considered to solve engineering problems such as formation water influx, wellbore instability, and excess gas requirement in gas drilling. The performance of reverse circulation gas drilling depends to a large extent on the structure design of drill bit. An analytical model and a numerical model were developed in this study to simulate the asymmetric converging flow of gas under drill bit for reverse circulation gas drilling. The two models were compared and applied to the evaluation of a drill bit structure design for bottom hole cleaning capacity of gas flow. It was found that the pressure, velocity, and specific kinetic energy given by the analytical model are slightly lower than that given by the numerical model. The relative difference between the gas flow rates given by the analytical model and the numerical model is less than 5%. For the drill bit structure design considered in this study, the gas flow energy between the short blades is much higher than that between the long blades. A gas injection rate of 10 m3/min (360 ft3/min) is expected to clean the drill cuttings between the short blades, while a gas flow rate of 28 m3/min (990 ft3/min) is required to clean the drill cuttings between the long blades. Although the numerical model gives more accurate result than the analytical model in predicting hydraulics parameters, the analytical model is recommended for evaluating drill bit structure design because of its simplicity and conservativeness.

Finite Element Study of the Cutting Mechanics of the Three Dimensional Rock Turning Process

2015 ◽  
Author(s):  
Demeng Che ◽  
Jacob Smith ◽  
Kornel F. Ehmann
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Three Dimensional ◽  
Polycrystalline Diamond ◽  
Close Correlation ◽  
Experimental Results ◽  
Failure Behavior ◽  
Fe Model ◽  
Gas Drilling ◽  
Cutting Mechanics

The unceasing improvements of polycrystalline diamond compact (PDC) cutters have pushed the limits of tool life and cutting efficiency in the oil and gas drilling industry. However, the still limited understanding of the cutting mechanics involved in rock cutting/drilling processes leads to unsatisfactory performance in the drilling of hard/abrasive rock formations. The Finite Element Method (FEM) holds the promise to advance the in-depth understanding of the interactions between rock and cutters. This paper presents a finite element (FE) model of three-dimensional face turning of rock representing one of the most frequent testing methods in the PDC cutter industry. The pressure-dependent Drucker-Prager plastic model with a plastic damage law was utilized to describe the elastic-plastic failure behavior of rock. A newly developed face turning testbed was introduced and utilized to provide experimental results for the calibration and validation of the formulated FE model. Force responses were compared between simulations and experiments. The relationship between process parameters and force responses and the mechanics of the process were discussed and a close correlation between numerical and experimental results was shown.

Finite Element Simulation of Freezing Technology for Borehole Stability of Gas Drilling

2014 ◽  
Vol 962-965 ◽  
pp. 415-418
Author(s):  
Zong Gang Wang ◽  
Zhen Wei
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Freezing Point ◽  
Drill String ◽  
Frozen Soil ◽  
Conductive Heat ◽  
Formation Water ◽  
Borehole Stability ◽  
Finite Element Program ◽  
Gas Drilling

The gas drilling mainly relies on the high speed air flow to carry the cuttings. The formation water or oil mixed with the cuttings and then they stick together in clumps after the formation water or oil went into the hole annulus, the clumps stick on the drill string and the borehole. The clumps may block the hole annulus and cause the stick or bury the drill string and many other complex accident. It could stop the cuttings from sticking with the liquid through freezing the formation fluid with the liquid nitrogen. And the natural geotechnical becomes into the frozen soil, and forms the temporary solid which is intact, high strength and low-permeability. This paper utilize the ANSYS finite element program to simulate the 3D model of borehole and hole wall to calculate the freezing radius of the steady state, heat loss, temperature of the freezing point and the conductive heat time of the unsteady state. And this study has provided the basis of the freezing technology for borehole stability of gas drilling.

Simulation of Nine-Spacer Nozzle’s Flow Field of Al Roll-Casting Using Coupled Fluid-Thermal Finite Element Analysis

2010 ◽  
Vol 159 ◽  
pp. 697-702
Author(s):  
Ying Zhou ◽  
Ya Xi Tan
Keyword(s):  
Thermal Analysis ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Flow Field ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Cooling Capacity ◽  
Element Analysis ◽  
Roll Casting ◽  
Element Simulation

A three-dimensional coupled fluid-thermal finite element simulation model has been developed to provide analyzing distribution of velocity and temperature of nine-spacer nozzle by using FEM simulation of FLOTRAN module in ANSYS 6.0. To explore fluid-thermal analysis of the flow fields of nine-spacer nozzle of aluminum roll-casting, stricter analysis of postprocessing result was conducted by MATLAB. It was concluded that flow field of nine-spacer nozzle was able to match cooling capacity of cast rollers, but nine-spacer nozzle’s geometric flaw didn’t suit for working in the case of speed increasing of the drawing-sheet and thickness reducing of the aluminium sheet during roll casting.

Simulation of Ion-Flow Field Using Fully Coupled Upwind Finite-Element Method

2012 ◽  
Vol 27 (3) ◽  
pp. 1574-1582 ◽  
Author(s):  
Xiangxian Zhou ◽  
Tiebing Lu ◽  
Xiang Cui ◽  
Yongzan Zhen ◽  
Gang Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flow Field ◽  
Ion Flow ◽  
Fully Coupled ◽  
Element Method

Study on Structure Parameters of Reverse Circulation Drill Bit Secondary Injector Device Based on Injector Coefficient

2016 ◽  
Author(s):  
Huang Yong ◽  
Zhu Lihong ◽  
Zou Deyong ◽  
Liao Hualin ◽  
Wang Jinying ◽  
...  
Keyword(s):  
Drill Bit ◽  
Structure Parameters ◽  
Reverse Circulation

Computer Aided Finite Element Simulation of the Developed Driller System for Bone Drilling Process in Orthopedic Surgery

2019 ◽  
Vol 18 (04) ◽  
pp. 583-594 ◽  
Author(s):  
Kadir Gok ◽  
Arif Gok ◽  
Yasin Kisioglu
Keyword(s):  
Finite Element ◽  
Temperature Rise ◽  
Orthopedic Surgery ◽  
Soft Tissues ◽  
Experimental Results ◽  
Drilling Process ◽  
Drill Bit ◽  
Bone Drilling ◽  
Computer Aided ◽  
Driller System

Heat reveals during the bone drilling operations in orthopedic surgery because of friction between bone and surgical drill bit. The heating causes extremely important damages in bone and soft tissues. The heating has a critical threshold and it is known as 47∘C. If bone temperature value exceeds 47∘C, osteonecrosis occurs in bones and soft tissues. Many factors such as surgical drill bit geometry and material, drilling parameters, coolant has important roles for the temperature rise. Many methods are used to decrease the temperature rise. The most effective method among them is to use the coolant internally. Numeric simulations of a new driller system to avoid the overheating during the orthopedic operating processes were performed in this study. The numerical simulation with/without coolant was also performed using the finite element based software. Computer aided simulation studies were used to measure the bone temperatures occurred during the bone drilling processes. The outcomes from the simulations were compared with the experimental results. A good temperature level agreement between the experimental results and FEA simulations was found during the bone drilling process.

Sign in / Sign up

Export Citation Format

Share Document