Separation System Design and Equipments Performance Optimization for High-Viscosity and High-Density Drilling Fluid

Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B ◽

10.1115/imece2010-37984 ◽

2010 ◽

Author(s):

Renbo Xu ◽

Jingjiang Deng ◽

Xiaoguang Liu

Keyword(s):

Performance Optimization ◽

Orthogonal Experiment ◽

Drilling Fluid ◽

High Viscosity ◽

High Density ◽

Field Analysis ◽

Operating Variables ◽

Structural Variables ◽

Orthogonal Experiment Method ◽

Flow Field Analysis

For degassing of high-density and high-viscosity drilling fluid used in Ultra-high pressure oil & gas zones, carry out vertical separation systems, gravity separator for first and active centrifugal separator for secondary. Orthogonal experiment method for CFD simulates the flow field, Analysis operating variables, structural variables impact of efficiency; carry out the performance optimization scheme in accordance with the characteristics of flow fields.

Download Full-text

Design and Optimization of High-Viscosity and High-Density Drilling Fluid Separation System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.562 ◽

2010 ◽

Vol 34-35 ◽

pp. 562-565

Author(s):

Ren Bo Xu ◽

Xiao Guang Liu ◽

Fu Quan Tu

Keyword(s):

Performance Optimization ◽

Oil And Gas ◽

Orthogonal Experiment ◽

Drilling Fluid ◽

High Viscosity ◽

High Density ◽

Separation System ◽

Design And Optimization ◽

Orthogonal Experiment Method ◽

Fluid Separation

For degassion of high-viscosity and high-density drilling fluid used in ultra-high pressure oil and gas zones, a two-stage vertical separation system was established. In this system, gravity separator was used as the first separator and the second separator was centrifugal separator. Using orthogonal experiment method, we simulated flow field in this system by CFD software and analyzed the effect of operate variable and structural variable on system degassion efficiency. In accordance with the characteristics of flow fields, the performance optimization scheme was presented.

Download Full-text

Performance Prediction of a Turbodrill Based on the Properties of the Drilling Fluid

Machines ◽

10.3390/machines9040076 ◽

2021 ◽

Vol 9 (4) ◽

pp. 76

Author(s):

Delong Zhang ◽

Yu Wang ◽

Junjie Sha ◽

Yuguang He

Keyword(s):

High Temperature ◽

Performance Prediction ◽

Drilling Fluid ◽

High Viscosity ◽

High Density ◽

Fluid Viscosity ◽

Two Phase ◽

Geometry Model ◽

Multi Stage ◽

Fluid Properties

High-temperature geothermal well resource exploration faces high-temperature and high-pressure environments at the bottom of the hole. The all-metal turbodrill has the advantages of high-temperature resistance and corrosion resistance and has good application prospects. Multistage hydraulic components, consisting of stators and rotors, are the key to the turbodrill. The purpose of this paper is to provide a basis for designing turbodrill blades with high-density drilling fluid under high-temperature conditions. Based on the basic equation of pseudo-fluid two-phase flow and the modified Bernoulli equation, a mathematical model for the coupling of two-phase viscous fluid flow with the turbodrill blade is established. A single-stage blade performance prediction model is proposed and extended to multi-stage blades. A Computational Fluid Dynamics (CFD) model of a 100-stage turbodrill blade channel is established, and the multi-stage blade simulation results for different fluid properties are given. The analysis confirms the influence of fluid viscosity and fluid density on the output performance of the turbodrill. The research results show that compared with the condition of clear water, the high-viscosity and high-density conditions (viscosity 16 mPa∙s, density 1.4 g/cm3) will increase the braking torque of the turbodrill by 24.2%, the peak power by 19.8%, and the pressure drop by 52.1%. The results will be beneficial to the modification of the geometry model of the blade and guide the on-site application of the turbodrill to improve drilling efficiency.

Download Full-text

Aerodynamic Performance of a Coaxial Hex-Rotor MAV in Hover

Aerospace ◽

10.3390/aerospace8120378 ◽

2021 ◽

Vol 8 (12) ◽

pp. 378

Author(s):

Yao Lei ◽

Jiading Wang ◽

Wenjie Yang

Keyword(s):

Performance Optimization ◽

Structural Design ◽

Aerodynamic Characteristics ◽

Aerodynamic Performance ◽

Field Analysis ◽

Test Results ◽

Compact Structure ◽

Coaxial Rotor ◽

Optimum Aerodynamic ◽

Flow Field Analysis

Micro aerial vehicles (MAVs) usually suffer from several challenges, not least of which are unsatisfactory hover efficiency and limited fly time. This paper discusses the aerodynamic characteristics of a novel Hex-rotor MAV with a coaxial rotor capable of providing higher thrust in a compact structure. To extend the endurance during hover, flow field analysis and aerodynamic performance optimization are conducted by both experiments and numerical simulations with different rotor spacing ratios (i = 0.56, 0.59, 0.63, 0.67, 0.71, 0.77, 0.83, 0.91). The measured parameters are thrust, power, and hover efficiency during the experiments. Retip ranged from 0.7 × 105 to 1.3 × 105 is also studied by Spalart–Allmaras simulations. The test results show that the MAV has the optimum aerodynamic performance at i = 0.56 with Retip = 0.85 × 105. Compared to the MAV with i = 0.98 for Retip = 0.85 × 105, thrust is increased by 5.18% with a reduced power of 3.8%, and hover efficiency is also improved by 12.14%. The simulated results indicate a weakness in inter-rotor interference with the increased rotor spacing. Additionally, the enlarged pressure difference, reduced turbulence, and weakened vortices are responsible for the aerodynamic improvement. This provides an alternative method for increasing the MAV fly time and offers inspiration for future structural design.

Download Full-text

Flow Field Analysis on the Erosion Prone Parts of the Drilling Equipment

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.697.350 ◽

2014 ◽

Vol 697 ◽

pp. 350-355

Author(s):

Qing Lei Wang ◽

Li Ping Dong

Keyword(s):

Flow Field ◽

Theoretical Basis ◽

Drilling Fluid ◽

Rate Of Change ◽

Field Analysis ◽

Fluid Flow Rate ◽

The Finite Element Method ◽

Drilling Equipment ◽

Flow Field Analysis ◽

Drilling System

The erosion and wear mechanism for drilling equipment is studied in this paper, which is for the problem of unstable performance of drilling system and short lifetime caused by the erosion of drilling equipment by drilling fluid. The flow field, surface pressure of the erosion prone parts and drilling fluid flow rate are calculated by the finite element method. The results demonstrate the parts eroded seriously by drilling fluid appear in where the curvature of the curve of the wall changes suddenly and where the rate of change in the stress field is greater, which provide a theoretical basis on design, optimize, repair of drilling equipment.

Download Full-text