Models &amp; tests of casing wear in drilling for oil &amp; gas

Sun, Lianzhong; Gao, Deli; Zhu, Ke

doi:10.1016/j.jngse.2011.06.005

Cited by 26 publications

(18 citation statements)

References 10 publications

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“…Previous study mainly investigates the contact force between casing and drill pipe body. 7 However, the effect of tool joint on contact force distribution cannot be ignored because tool joint is generally bigger than drill pipe body, which is especially true in highly-deviated wells or extended reach wells. 12 To consider the effect of tool joint on contact force distribution, mechanical analysis is carried out on the drill pipe unit in Figure 3.…”

Section: Contact Force Modelmentioning

confidence: 99%

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

2020

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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.

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Section: Contact Force Modelmentioning

confidence: 99%

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

2020

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“…The width of P110 casing specimen is 13 mm, as shown in Figure 6(b). In tests, the anti-hightemperature KCl drilling fluid with density of 1.02 g/ cm 3 was adopted. The experiment was conducted at contact force F N from 60 to 120 N and the rotating speed of 60 r/min.…”

Section: Casing Wear Experimentsmentioning

confidence: 99%

“…[1][2][3] The highly deviated well in this article refers to the well with deviation angle greater than 45°. 4,5 Because of long drilling cycle, large friction, and big side force acting on the casing, the casing wear phenomenon is very severe.…”

Section: Introductionmentioning

confidence: 99%

“…Through a wide variety of wells with measured depths (MDs) greater than 13,000 ft, Mitchell and Xiang 15 created an extensive database and presented an improved casing wear prediction model using the statistically based model. Through the comparisons of different experimental tests, Sun et al 3 established a nonlinear wear model to consider running-in casing wear and steady-state casing wear during pipe rotation. Shen and Beck 16 proposed an analytical solution for the stress evolution in worn casing based on the boundary superposition principle.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical study on casing wear in highly deviated drilling for oil and gas

Lian

Lin

et al. 2016

Advances in Mechanical Engineering

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Aimed at studying the casing wear in the highly deviated well drilling, the experimental study on the casing wear was carried out in the first place. According to the test data and the linear wear model based on the energy dissipation proposed by White and Dawson, the tool joint-casing wear coefficient was obtained. The finite element model for casing wear mechanism research was established using ABAQUS. The nodal movement of the contact surface was employed to simulate the evolution of the wear depth, exploiting the Umeshmotion user subroutine. In addition, the timedependent geometry of the contact surfaces between the tool joint and casing was being updated continuously. Consequently, the contact area and contact pressure were changed continuously during the casing wear process, which gives a more realistic simulation. Based on the shapes of worn casing, the numerical simulation research was carried out to determine the remaining collapse strength. Then the change curve of the maximum casing wear depth with time was obtained. Besides, the relationship between the maximum wear depth and remaining collapse strength was established to predict the maximum wear depth and the remaining strength of the casing after a period of accumulative wear, providing a theoretical basis for the safety assessment of worn casing.

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“…Several models have been proposed to estimate casing wear, like the wear-efficiency model (White et al 1987) (Hall et al 1994), and the nonlinear casing wear model (Sun et al 2012). In this application, we utilize this latter model because it has been shown to better describe the phenomenon better than the former one (Sun et al 2012). Accordingly to the nonlinear wear model, the volume V of casing removed (per foot of well depth) [in 3 /ft] by the tool joint is (Deli et al 2010):…”

Section: Case Studymentioning

confidence: 99%

Resistance-based probabilistic design by order statistics for an oil and gas deep-water well casing string affected by wear during kick load

Maio¹,

Baraldi²,

Brivio³

et al. 2016

Risk, Reliability and Safety: Innovating Theory and Practice

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Deep-water wells for oil and gas extraction make structural components, such as casing and tubing , work in extremely harsh environmental conditions that accelerate component degradation and increase failure probability. Therefore, it is important to properly design casing strings under these operative circumstances. To do this, a Resistance-Based Probabilistic Design (RBPD) approach is here complemented with the quantification of the probabilistic safety margin that the design load does not exceed the casing strength. Wear is taken as the main degradation mechanism during drilling and the accidental event of a kick load is considered to affect the performance of the casing string. By so doing, we consider all uncertainties affecting the casing burst strength and evaluate the string safety by the Order Statistic (OS) method.

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Models & tests of casing wear in drilling for oil & gas

Cited by 26 publications

References 10 publications

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

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

Experimental and numerical study on casing wear in highly deviated drilling for oil and gas

Resistance-based probabilistic design by order statistics for an oil and gas deep-water well casing string affected by wear during kick load

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