A Prediction Model of Casing Wear in Extended-Reach Drilling With Buckled Drillstring

2017 ◽  
Vol 85 (2) ◽  
Author(s):  
Leichuan Tan ◽  
Deli Gao ◽  
Jinhui Zhou
Keyword(s):  
Practical Method ◽  
Economic Loss ◽  
Groove Depth ◽  
Calculation Error ◽  
Wear Depth ◽  
Energy Principle ◽  
New Model ◽  
Casing Wear ◽  
Complicated Geometry ◽  
Extended Reach Drilling

Buckled drillstring easily existed in extended-reach drilling (ERD) engineering, causing casing wear more severe. However, the effect of the buckled drillstring on casing wear prediction is going unheeded in long-term studies. To solve the issue, this paper proposes a new model, named as circumferential casing wear depth (CCWD) model, based on the energy principle and the more complicated geometry relationship than that in casing wear groove depth (CWGD) model. Meanwhile, sensitivity analysis of parameters clearly describes the changing trends among them. With the established composite wear models, the change of casing wear depth versus drilling footage under different composite wear cases is also discussed. The results show that the severe casing wear may occur if there is the buckled drillstring; due to the greater contact force and more sophisticated wear shape than those under nonbuckling condition, a shorter drilling footage could make a larger calculation error when only CWGD model is used. In the case study, the method of the inversion of casing wear factor from the drilled well can be used to predict the well whose structure resembles it; the revised coefficient, the maximum risky casing wear depth can be evaluated for each wellbore section to avoid drilling engineering failure. The new model provides a practical method to improve the prediction accuracy of casing wear in ERD. Neglecting the effect of the buckled drillstring will make the prediction underestimated and a great economic loss, which is significant for ERD.

Application of a Viscoelastic Model for Polyester Mooring

2010 ◽  
Author(s):  
J. W. Kim ◽  
J. H. Kyoung ◽  
A. Sablok
Keyword(s):  
Material Properties ◽  
Viscoelastic Model ◽  
Practical Method ◽  
Time Dependent ◽  
Mooring Line ◽  
New Model ◽  
Global Performance ◽  
Excitation Period ◽  
Linear Viscoelastic ◽  
Floating Platforms

A new practical method to simulate time-dependent material properties of polyester mooring line is proposed. The time-dependent material properties of polyester rope are modeled with a standard linear solid (SLS) model, which is one of the simplest forms of a linear viscoelastic model. The viscoelastic model simulates most of the mechanical properties of polyester rope such as creep, strain-stress hysteresis and excitation period-dependent stiffness. The strain rate-stress relation of the SLS model has been re-formulated to a stretch-tension relation, which is more suitable for implementation into global performance and mooring analyses tools for floating platforms. The new model has been implemented to a time-domain global performance analysis software and applied to simulate motion of a spar platform with chain-polyester-chain mooring system. The new model provides accurate platform offset without any approximation on the mean environmental load and can simulate the transient effect due to the loss of a mooring line during storm conditions, which has not been possible to simulate using existing dual-stiffness models.

Design of Measure and Control System of the Ring Block Casing Wear Tester

2013 ◽  
Vol 423-426 ◽  
pp. 2414-2418
Author(s):  
Xiang Tong Yang ◽  
Xiao Zeng Wang ◽  
Yin Ping Cao ◽  
Yi Hua Dou
Keyword(s):  
Control System ◽  
Calibration Method ◽  
Contact Forces ◽  
Wear Depth ◽  
Friction Forces ◽  
Deep Wells ◽  
Geological Conditions ◽  
Casing Wear ◽  
Measure And Control System ◽  
And Control

In deep wells and ultra-deep wells the complex geological conditions often result in serious casing wear. In order to obtain the wear efficiency which is used to compute the wear depth of downhole casing, the ring block drillpipe casing wear tester is developed. The measure and control system which include the measure circuits of contact forces between casing and drillpipe samples, the measure circuits of the friction forces are main component of wear tester. It is very important to design the measure and control system of tester. The paper also develops the calibration method of the loads sensors used to measure the contact and friction force. The wear tester can accurately measure the wear efficiency and the friction coefficient needed by casing wear prediction.

scholarly journals A New Approach for Accurate Prediction of Liquid Loading of Directional Gas Wells in Transition Flow or Turbulent Flow

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Ruiqing Ming ◽  
Huiqun He
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Correction Coefficient ◽  
Calculation Error ◽  
Gas Velocity ◽  
Transition Flow ◽  
Deviation Angle ◽  
Vertical Wells ◽  
Liquid Loading ◽  
New Model

Current common models for calculating continuous liquid-carrying critical gas velocity are established based on vertical wells and laminar flow without considering the influence of deviation angle and Reynolds number on liquid-carrying. With the increase of the directional well in transition flow or turbulent flow, the current common models cannot accurately predict the critical gas velocity of these wells. So we built a new model to predict continuous liquid-carrying critical gas velocity for directional well in transition flow or turbulent flow. It is shown from sensitivity analysis that the correction coefficient is mainly influenced by Reynolds number and deviation angle. With the increase of Reynolds number, the critical liquid-carrying gas velocity increases first and then decreases. And with the increase of deviation angle, the critical liquid-carrying gas velocity gradually decreases. It is indicated from the case calculation analysis that the calculation error of this new model is less than 10%, where accuracy is much higher than those of current common models. It is demonstrated that the continuous liquid-carrying critical gas velocity of directional well in transition flow or turbulent flow can be predicted accurately by using this new model.

Experimental Study and Prediction Model of Casing Wear in Oil and Gas Wells

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Zhanghua Lian ◽  
Qiang Zhang ◽  
Tiejun Lin ◽  
Kuncheng Li ◽  
Yonghui Liu
Keyword(s):  
Prediction Model ◽  
Contact Force ◽  
Oil And Gas ◽  
Economic Losses ◽  
Wear Depth ◽  
Gas Wells ◽  
Wear Prediction ◽  
Oil And Gas Wells ◽  
Casing Wear ◽  
Force Calculation

With the development of drilling technology and reinforced exploration and exploitation of unconventional reservoirs, there has been a great increase of complex wells. Meanwhile, however, consequent casing wear is and will continue to be a serious problem that causes enormous economic losses and many safety issues. The purpose of this paper is to find out the mechanism of casing wear and establish casing wear prediction model. Casing wear experiment was carried out to study the effect of contact force, rotation speed, and casing grade on wear depth. Meanwhile, wear coefficients under different working conditions were obtained through the normalizing of data. With the extensive research of downhole drag and torque calculation method, a contact force calculation model was established. Through the combination of crescent-shaped model and wear-efficiency model, the past complicated casing wear prediction models and confusing empirical formulae were greatly simplified. Therefore, the wear volume and depth of the casing string can be accurately predicted. Finally, a prediction software was developed to predict downhole casing wear of oil and gas wells. Comparison with the field data confirmed that the established model and software had enough accuracy to help predict and analyze casing wear at field.

scholarly journals Prediction of casing wear depth and residual strength in highly-deviated wells based on modeling and simulation

2020 ◽  
Vol 103 (4) ◽  
pp. 003685042096957
Author(s):  
Liangliang Ding ◽  
Miao Xian ◽  
Qiang Zhang
Keyword(s):  
Friction Coefficient ◽  
Contact Force ◽  
Residual Strength ◽  
Strength Degradation ◽  
Force Model ◽  
Wear Depth ◽  
Wear Prediction ◽  
Strength Evaluation ◽  
Casing Wear ◽  
Deviated Wells

Casing wear is a serious problem in highly-deviated wells because serious wear will lead to casing deformation, drilling tool sticking and failure of subsequent operations. The purpose of this paper is to predict casing wear depth and evaluate its effect on casing strength degradation in highly-deviated well drilling operation. Special attention has been given to the algorithm to achieve the prediction and evaluation. The effect of tool joint on contact force distribution is considered in contact force model. Then a wear depth prediction model and its solution method are proposed based on crescent-shaped wear morphology and wear-efficiency model. Besides, strength degradation of worn casing is analyzed in bipolar coordinate system and the model is verified by finite element method. Therefore, the technology of casing wear prediction and residual strength evaluation is completed systematically. Then, to apply casing wear prediction and residual strength evaluation technologies to an actual highly-deviated well, casing wear experiment and friction coefficient experiment are carried out to obtain wear coefficient and friction coefficient. Finally, based on the established models as well as experimental results, the distribution of casing wear is predicted and residual strength is evaluated. The method presented in this paper will contribute greatly to casing wear prediction and evaluation in highly-deviated wells.

The Experimental Research of P110 Casing Wear-Resisting Property in Oil Base Mud

2014 ◽  
Vol 1073-1076 ◽  
pp. 2231-2234
Author(s):  
Hong Xue Mi ◽  
Guo Liang Li ◽  
Xiao Zeng Wang ◽  
Yang Yu ◽  
Yi Hua Dou
Keyword(s):  
Friction Coefficient ◽  
Contact Force ◽  
Wear Mechanism ◽  
Oil And Gas ◽  
Wear Depth ◽  
Gas Well ◽  
Burst Strength ◽  
Rotating Speed ◽  
Maximum Value ◽  
Casing Wear

The contact and slide under high pressure between casing and tool joint leads to wear of the casing inner surface in cemented well. The reduced collapse and burst strength of worn casing threats to the safety of oil and gas well. In order to calculate the wear depth and residual strength of the casing wear, the wear efficiency and friction coefficient is measured in the different wear time, the contact force and the rotating speed. The wear efficiency is in proportion to the contact force and the rotating speed. The wear efficiency of P110 casing change from 2 to 4×10-131/Pa. Friction coefficient reaches maximum value under certain contact force and rotating speed. The rotating speed has less influence on the wear mechanism of casing, while the contact force play a greater influence on the wear mechanism.

scholarly journals Prediction of casing wear in extended-reach drilling

2010 ◽  
Vol 7 (4) ◽  
pp. 494-501 ◽  
Author(s):  
Deli Gao ◽  
Lianzhong Sun ◽  
Jihong Lian
Keyword(s):  
Casing Wear ◽  
Extended Reach Drilling

scholarly journals New Micromechanical Model for Predicting Biaxial Tensile Moduli of Plain Weave Fabric Composites

2016 ◽  
Author(s):  
Jiangbo Bai ◽  
Junjiang Xiong ◽  
Qiang Wang
Keyword(s):  
Biaxial Loading ◽  
Micromechanical Model ◽  
Tensile Tests ◽  
Woven Fabric ◽  
Curved Beams ◽  
Energy Principle ◽  
New Model ◽  
Plain Weave ◽  
Biaxial Tensile ◽  
Weave Fabric

This paper addresses a new micromechanical model to predict biaxial tensile moduli of plain weave fabric (PWF) composites by considering the interaction between the orthogonal interlacing strands. The two orthogonal yarns in micromechanical unit cell (UC) were idealized as the curved beams with a path depicted by using sinusoidal shape functions. The biaxial tensile moduli of PWF composites were derived by means of the minimum total complementary potential energy principle founded on micromechanics. The biaxial tensile tests were respectively conducted on the RTM-made EW220/5284 PWF composites at five biaxial loading ratios of 0, 1, 2, 3 and ∞ to validate the new model. The predictions from the new model were compared with experimental data and good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed model. Using the new model, the biaxial tensile moduli of plain weave fabric (PWF) composites could be predicted based only on the properties of basic woven fabric.

Study of Resistance to Wear of P110 Casing Down-Hole in Water Based Mud

2014 ◽  
Vol 687-691 ◽  
pp. 224-227
Author(s):  
Guo Liang Li ◽  
Hong Xue Mi ◽  
Xiao Zeng Wang ◽  
Yang Yu ◽  
Yi Hua Dou
Keyword(s):  
Friction Coefficient ◽  
Contact Force ◽  
Wear Depth ◽  
Well Test ◽  
Rotating Speed ◽  
Wear Time ◽  
Water Based ◽  
Resistance To Wear ◽  
Casing Wear

The operation of drilling well leads to casing wear to some degree in cased well. The reduced strength of worn casing threats to the safety of well test and completion. In order to calculate casing wear depth and prevent the casing wear, the wear efficiency and friction coefficient is measured in the different wear time, the contact force and the rotating speed. The wear efficiency increases with the contact force and the rotating speed. And the bigger the rotating speed, the bigger the friction coefficient. The wear efficiency of P110 casing is change from 2 to 8×10-13 1/Pa. The rotating speed has less influence on the wear efficient. So it is reasonable that the wear efficiency model is adopted to calculate the wear degree of P110 casing.

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