Recent Advances in Casing Wear Technology

R.W., Hall; Garkasi, Ali; Deskins, Greg; Vozniak, John

doi:10.2523/27532-ms

Cited by 11 publications

(4 citation statements)

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“…Experimentally determined over an 8-hour testing period, the Casing Wear Factor, WF, is then defined as the ratio of friction factor to specific energy, as shown in equation 2, ε µ = WF …………..……………………………………… (2) and the sliding distance is defined as shown in equation 3,…”

mentioning

confidence: 99%

Contact Pressure Threshold: An Important New Aspect of Casing Wear

Hall¹,

Malloy²

2005

Proceedings of SPE Production Operations Symposium

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mentioning

confidence: 99%

Contact Pressure Threshold: An Important New Aspect of Casing Wear

Hall¹,

Malloy²

2005

Proceedings of SPE Production Operations Symposium

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“…Bradley(1975), Bol(1986), Williamson (1985) and Hall(1993Hall( , 1994Hall( , 2005, and others have all helped to develop methods of calculating casing wear. Bradley(1975), Bol(1986), Williamson (1985) and Hall(1993Hall( , 1994Hall( , 2005, and others have all helped to develop methods of calculating casing wear.…”

Section: Casing Wear Calculationmentioning

confidence: 99%

“…Many researchers, including Bradley(1975), Bol(1986), Williamson (1985) and Hall(1993Hall( , 1994Hall( , 2005,have concluded that the volume of steel removed from casing is proportional to frictional work done by the tool joint rotating against the casing.…”

Section: Wear Factormentioning

confidence: 99%

Improving Casing Wear Prediction and Mitigation Using a Statistically Based Model

Mitchell¹,

Xiang²

2012

IADC/SPE Drilling Conference and Exhibition

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Wells are now routinely drilled both in deepwater and on land to depths that were previously considered impossible. In these environments, casing design is critical to safely and successfully drilling and producing wells, and unexpected casing wear can result in significant costs or even the loss of a well. As part of a successful casing design strategy, the engineer must assess the maximum permissible casing wear required to maintain casing integrity. Then, steps must be taken to ensure that casing wear thresholds are not exceeded.Casing wear models use the number of drill string revolutions and contact force between the drill pipe and casing to calculate wear. The contact force is calculated using the dog-leg severity within the well, with the maximum dog-leg severity often determining the location and extent of the most severe casing wear. There is often a large discrepancy between predicted and actual casing wear because of survey quality and inaccurate estimates of dog-leg severity and total revolutions. These discrepancies result in predictions of contact force and drill string revolutions that are in error by 50% or more. To improve the accuracy of casing wear models, an extensive database was created from a wide variety of wells with measured depths greater than 13,000ft. The database results in a statistically based model for determining dog-leg severity within vertical, build, and tangent sections, as well as total drill string revolutions at various levels of confidence to bound average and maximum expected contact force and casing wear.Case histories compare measured wear with predictions of casing wear based on original well data and the statistically based model. The case histories also demonstrate the effect of various drilling parameters on casing wear, and evaluate the effectiveness of non-rotating protectors in preventing casing wear. Project GoalThe goal of this project was to more accurately quantify casing wear risk by improving casing wear analysis accuracy. To do this, data from a large number of wells was analyzed to generate probabilities for dog-leg severity in common well types and also correlate those to actual backmodeled casing wear factors. The results will allow an engineer to analyze what the expected casing wear might be for an average (P50) horizontal well, and then evaluate the maximum expected wear for a 1 in 10 case (P90), 1 in 20 case (P95), or 1 in 100 (P99) case. SurveysAll casing wear software, and torque and drag software as well, use a directional survey to determine the side force or contact force between the drill string and wellbore. These points within a directional survey can be a representation of a planned well path, or it can be taken from actual downhole measurements. The survey points are then connected into a single line representing a best approximation of the wellpath with the information given.

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“…Song 12 studied the formula of the casing wear and presented an accurate method to calculate the strength of worn wear based on a crescent-shaped groove by building polar coordinate. Hall et al 13 argued that the casing wear is mainly associated with the wear coefficient, contact pressure, and sliding distance and deduced a prediction casing wear model based on the simplified static wear efficiency model. Gao and Sun 14 modified the wear efficiency model by considering the change in the contact pressure during casing wear process and developed the nonlinear relationship of the wear depth and time.…”

Section: Introductionmentioning

confidence: 99%

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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Recent Advances in Casing Wear Technology

Cited by 11 publications

References 0 publications

Contact Pressure Threshold: An Important New Aspect of Casing Wear

Contact Pressure Threshold: An Important New Aspect of Casing Wear

Improving Casing Wear Prediction and Mitigation Using a Statistically Based Model

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

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