Slimhole Drilling Hydraulics

Delwiche, R.; Lejeune, M.W.D.; Mawet, P.F.B.N.; Vighetto, R.

doi:10.2118/24596-ms

Cited by 33 publications

(13 citation statements)

References 4 publications

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“…In separate studies conducted at drilling sites in the North Sea (Charlez 1998;Isambourg 1999), the effects of drillpipe rotation were studied while circulating and rotating at various rates inside casing (without cuttings), and the results were analyzed in terms of changes in ECD as calculated from downhole pressure tool data. In an early study of slimhole applications, the effects of drillpipe rotation on changes in ECD on narrow-annuli wells in Gabon (Delwiche 1992) were measured. In all of these early studies, no attempt was made to model the results into a coherent calculation scheme.…”

Section: Previous Workmentioning

confidence: 99%

A Simplified Method for Prediction of ECD Increase with Drillpipe Rotation

et al. 2008

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The ability to accurately predict the effect of drillpipe rotation on Equivalent Circulating Density (ECD) remains a challenge for those involved in engineering today's complex wells. In many of these challenging wells (extended-reach drilling, deepwater, HPHT, etc.), the safe drilling window between hole collapse and fracturing is often narrow. Accurate prediction of the effect of drillpipe rotational speed could allow better optimization of operational parameters in the drilling process, and hopefully reduce the incidence of violation of the safe drilling window.Recently ECD results measured at different circulation rates and drillpipe rotational speeds were modeled and presented to the industry. The calculation methods involved several complex factors including estimated drillpipe eccentricity, nonlinear shear rate modeling coefficients, drillpipe geometry correction factors, etc. The presented results constituted the best-available correlation with direct downhole pressure measurements, but still showed improvement was needed.Further development work has been done in this same area to reduce the complexity of the calculations and yet improve modeling accuracy. It was noticed that the effect of increasing drillpipe rotational speed at a constant annular velocity produced a near-linear increase in ECD. In addition the ratio of the internal diameter of the hole or casing and the outer diameter of the drillpipe (Di/Do) was found to be a meaningful modeling parameter that could transcend explicit values of estimated drillpipe eccentricity. Data from the earlier work and some additional field results were then reworked using the new calculation scheme, which is presented in the paper. The results presented in this paper show that this calculation technique can produce better prediction of field measurements of downhole pressure changes while rotating and is much simpler to use. Not only can it help in navigating through the safe drilling window, but it also can be used to separate pure rotation effects from other coupled wellbore events, such as hole cleaning and barite sag.

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Section: Previous Workmentioning

confidence: 99%

A Simplified Method for Prediction of ECD Increase with Drillpipe Rotation

et al. 2008

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“…hole, confirm field observations that high-speed pipe rotation increases as annular pressure drops. 6,8 Drilling-Ahead Model. The EKD dynamic model was required to run continuously for each bit run.…”

Section: The Hydraulic Modelmentioning

confidence: 99%

“…A simple pressure-drop calculation confirms that in slimhole the annulus will provide the bulk of pressure losses, a result confirmed by Bode et al 1 The annular pressure drop is also very sensitive to the rotational speed of the drillpipe. A number of authors 1,[5][6][7]9 have demonstrated the increase in annular pressures caused by drillpipe rotation at high speed. The additional pressure caused by pipe rotation is such that pressures and flowrates will be affected throughout the well.…”

Section: Introductionmentioning

confidence: 99%

Slimhole Early Kick Detection by Real-Time Drilling Analysis

Swanson

Gardner

Brown

et al. 1997

SPE Drilling &Amp; Completion

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Early kick detection has been identified as being of primary importance in slimhole wellbores. Small annular volumes mean that, to maintain the integrity of the well, allowable kick volumes must be small. Gas influxes must therefore be detected and shut in rapidly. This paper describes an early kick-detection system developed for slimholes to detect and confirm the presence of an influx rapidly. This system has been run successfully on a number of slimhole operations.The early kick-detection (EKD) system is based on real-time analysis of drilling data obtained directly from a comprehensive mud-logging system on the rig. The analysis technique compares predictions of mud flow out and standpipe pressure from a dynamic wellbore model with corresponding values from the rig. The predicted values are derived from a model driven in real time by rig data such as pump rate and pipe rotation rate. Kick detection is based on deviations between measured data and idealized model predictions.The EKD system has been incorporated into an operational engineer-oriented graphical interface, which has provided easy access to the model for both input and output of data, and for the interpretation of results. This paper describes the design considerations and technology behind the EKD system and the engineering interface. The paper also presents examples of the system running in real time at a slimhole rig site.

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“…Delwiche et al (1) and Marken et al. (2) investigated using real wells' pipe rotation effects on pressure loss and found that frictional pressure loss increased if rotation to the inner cylinder in the annulus was applied.…”

Section: Introductionmentioning

confidence: 99%

Frictional Pressure Loss Estimation of Non-Newtonian Fluids in Realistic Annulus With Pipe Rotation

Ozbayoglu

Sorgun

2010

Journal of Canadian Petroleum Technology

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Summary The annular frictional performance of non-Newtonian fluids is among the major considerations during development of hydraulic programs for drilling operations. Proper estimation of the frictional pressure losses become more critical when determining hydraulic horsepower requirements and selecting proper mud pump systems to foresee any serious problems that might occur with hydraulics during drilling operations. Because the rheological behaviour of the non-Newtonian fluids is known to be challenging, it becomes even more complicated during pipe rotation, especially in eccentric wellbores. In many cases, significant differences are observed when theoretical calculations and measurements for pressure losses are compared. This study aims to develop correction factors for determining the frictional pressure losses accurately in eccentric horizontal annulus for non-Newtonian fluid, including the effect of pipe rotation. Extensive experimental work has been conducted on METU-PETE Flow Loop for numerous non-Newtonian drilling fluids, including KCl-polymer muds and PAC systems for different flow rates and pipe rotation speeds, and frictional pressure losses are recorded during each test. Rheological characteristics of the drilling fluids are determined using a rotational viscometer. Observations showed that pipe rotation has a significant influence on frictional pressure loss, especially at lower flow rates. Up to a point, as the pipe rotation increases, the frictional pressure losses also increase. As the flow rates are increased, the effect of pipe rotation on frictional pressure losses diminishes. Also, after a certain pipe rotation speed, no additional contribution of pipe rotation on frictional pressure loss is observed. When the developed friction factors are used, there is a good agreement between the calculated and observed frictional pressure losses for any pipe rotation speed.

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Slimhole Drilling Hydraulics

Cited by 33 publications

References 4 publications

A Simplified Method for Prediction of ECD Increase with Drillpipe Rotation

A Simplified Method for Prediction of ECD Increase with Drillpipe Rotation

Slimhole Early Kick Detection by Real-Time Drilling Analysis

Frictional Pressure Loss Estimation of Non-Newtonian Fluids in Realistic Annulus With Pipe Rotation

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