Evaluating the Transport of Solids Generated by Shale Instabilities in ERW Drilling

Martins, A.L.; Santana, Maria Luzia da Silva; Gaspari, E.F.; Campos, Wellington

doi:10.2118/50380-ms

Cited by 17 publications

(10 citation statements)

References 10 publications

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“…Previous studies of cuttings transport models can be categorized into two main types, the steady models (Doron et al, 1987(Doron et al, , 1997Doron and Barner, 1993;Gavignet and Sobey, 1989;Wang et al, 1993;Nguyen and Rahman, 1996;Hyun et al, 2000;Zhang, 2003, 2004a;Ramadan et al, 2005;Guo and Wang, 2007) and the unsteady models (Martins et al, 1999;Wang and Zhang, 2004b;Naganawa, 2006). The steady models have been experienced from one-layer models to two-layer models, and finally to three-layer models.…”

Section: Introductionmentioning

confidence: 99%

Study on three-layer unsteady model of cuttings transport for extended-reach well

Guo

Wang

Zhi-hui

2010

Journal of Petroleum Science and Engineering

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Section: Introductionmentioning

confidence: 99%

Study on three-layer unsteady model of cuttings transport for extended-reach well

Guo

Wang

Zhi-hui

2010

Journal of Petroleum Science and Engineering

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“…Similar to the models developed in the mining industry [13][14][15] , Gavignet 16 , Walton 17 , Martins 18 and Nguyen 19 developed two/three layer mechanistic models to predict the bed height and pressure drop. However such models are not able to model cuttings transport at medium inclination angles (35 o -55 o ) due to the chaotic motion of the cuttings 1 .…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Hole Cleaning Parameters in Directional Wells

Li¹,

Walker²

1999

All Days

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe major differences between conventional rotary drilling and Coiled Tubing drilling are the absence of pipe rotation and the continuous circulation of drilling fluids.• In rotary drilling the circulated fluid must be selected to support the cuttings while making a connection. In slide drilling, the circulated fluids can be continuously circulated. This capability greatly aids the use of gasified fluids in underbalanced drilling. • In slide drilling, the pipe does not rotate; while in rotary drilling, the pipe rotation enhances the cuttings transport by the agitation effect due to the pipe rotation and vibration. For a typical Coiled Tubing drilling job, the challenge is achieving the circulation rate required to keep the hole clean. Current field practice is to perform frequent wiper trips.The economics of hole cleaning are crucial to the industry and therefore we seek answers to questions such as:• What is the change in the cuttings bed height when the fluids flow rates are altered? • How long does it take to clean out an existing cuttings bed?• Is there a need to remove the cuttings bed fully before resuming drilling? In this study, 600 tests were conducted and a new computer program was developed for the prediction of cuttings transport in the multi-phase system (gas+liquid+cuttings). The sensitivity of cuttings bed height with respect to liquid/gas volume flow rate ratio, in-situ liquid velocity, ROP, inclination angle and circulation fluid properties was conducted. The hole cleaning time with both circulation mode and wiper trip is also discussed. The results from the sensitivity analysis presented in this paper indicate that: i) the fraction of the circulation liquid has a significant impact on the cuttings transport in underbalanced drilling with gasified fluids, ii) among different variables, the in-situ liquid velocity is the most important variable for cuttings transport, iii) the hole cleaning time decreases non-linearly with increasing fluid circulation rate.

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“…The unstable effects of this added amount of solids are taken into account through a variable representing the added volume of cuttings per unit time and length. A finite volume approach is used to solve the system of differential equations 4 .…”

Section: A Few Examples Of Activities Carried Out and Results Obtainementioning

confidence: 99%

Planning Extended Reach Wells for Deep Water

Cunha

Martins

et al. 2002

SPE International Petroleum Conference and Exhibition in Mexico

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractAlthough Extended Reach Wells (ERW) have recently reached limits that would not even be dreamed a few years ago, most of those wells were drilled from onshore locations. Even though there are some experiences offshore, they are related to wells drilled on shallow waters from fixed platforms.In Brazil, where the major oil field producers are located in deep waters, ERW may be in some cases the only technical and economical viable solution to the development of such fields. ERW, besides minimizing problems related to fluid flow, will also diminish the cost of development in large extension fields by reducing the number of production units per field. Also it may be the mandatory option in case of development of a large field by means of using a dry completion system (a TLP for example).To drill ERW in deep water from a floating vessel such as a semi-submersible rig or a drill ship, is much more complex than performing the same job onshore. In Campos basin, Brazil, some of the problems that may be faced when drilling ERW in deep water fields are the presence of very unstable formations and small sedimentary coverage above the reservoir.Due to studies indicating the feasibility of the use of ERW to develop oilfields in that basin, an R&D project was created aiming to develop techniques and operational procedures to be used when drilling those wells. Main tasks of the project were: -Well planning; -Wellbore stability; -Horizontal completion and sand control; -Drilling and completion fluids; -Cuttings transport. This paper shows which methodology was used to manage the project and also some results and benefits obtained.

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Evaluating the Transport of Solids Generated by Shale Instabilities in ERW Drilling

Abstract: This paper was prepared for presentation at the 1998 SPE International Conference on Horizontal Well Technology held in Calgary, Alberta, Canada, 1-4 November 1998.

Cited by 17 publications

References 10 publications

Study on three-layer unsteady model of cuttings transport for extended-reach well

Study on three-layer unsteady model of cuttings transport for extended-reach well

Sensitivity Analysis of Hole Cleaning Parameters in Directional Wells

Planning Extended Reach Wells for Deep Water

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