Surge-and-swab pressure predictions for yield-power-law drilling fluids

Freddy Crespo, Ramadan Ahmed, Majed Enfis, Arild Saasen, Mahmood Amani

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Surge and swab pressures have been known io cause formation fracture, lost circulation, and well-control problems. Accurate prediction of these pressures is crucially important in estimating the maximum tripping speeds to keep the wcllbore pressure within specified limits of the pore and fracture pressures. It also plays a major role in running casings, particularly with narrow annular clearances. Existing surge/swab models are based on Bingham plastic (BP) and power-law (PL) fluid rheology models. However, in most cases, these models cannot adequately describe the flow behavior of drilling fluids. This paper presents a new steady-state model that can account for fluid and formation compressibility and pipe elasticity. For the closed-ended pipe, the model is cast into a simplified model to predict pressure surge in a more convenient way. The steady-state laminar-flow equation is solved for narrow slot geometry to approximate the flow in a concentric annulus with inner-pipe axial movement considering yield-PL (YPL) fluid. The YPL rheology model is usually preferred because it provides a better description of the flow behavior of most drilling fluids. The analytical solution yields accurate predictions, though not in convenient forms. Thus, a numerical scheme has been developed to obtain the solutions. After conducting an extensive parametric study, regression techniques were applied primarily to develop a simplified model (i.e., dimcnsionless correlation). The performance of the correlation has been tested by use of field and laboratory measurements. Comparisons of the model predictions with the measurements showed a satisfactory agreement. In most cases, the model makes better predictions in terms of closeness to the measurements because of the application of a more realistic rheology model. The correlation and model arc useful for slimholc, deepwater, and extended-reach drilling applications.

Original languageEnglish
Pages (from-to)574-585
Number of pages12
JournalSPE Drilling and Completion
Volume27
Issue number4
Publication statusPublished - Dec 2012
Externally publishedYes

Fingerprint

Drilling fluids
Rheology
Pipe
Fluids
Surges (fluid)
Compressibility
Laminar flow
Elasticity
Drilling
Plastics

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering

Cite this

Surge-and-swab pressure predictions for yield-power-law drilling fluids. / Crespo, Freddy; Ahmed, Ramadan; Enfis, Majed; Saasen, Arild; Amani, Mahmood.

In: SPE Drilling and Completion, Vol. 27, No. 4, 12.2012, p. 574-585.

Research output: Contribution to journalArticle

Crespo, F, Ahmed, R, Enfis, M, Saasen, A & Amani, M 2012, 'Surge-and-swab pressure predictions for yield-power-law drilling fluids', SPE Drilling and Completion, vol. 27, no. 4, pp. 574-585.
Crespo, Freddy ; Ahmed, Ramadan ; Enfis, Majed ; Saasen, Arild ; Amani, Mahmood. / Surge-and-swab pressure predictions for yield-power-law drilling fluids. In: SPE Drilling and Completion. 2012 ; Vol. 27, No. 4. pp. 574-585.
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