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Particle transport in inclined annuli

Abstract

A new model for the formation and behaviour of deposits in inclined wellbores is formulated. The annular space is divided into two layers, separated by a distinct plane boundary. While the lower layer is taken to consist of closely packed cuttings, the upper layer is presumed to behave as a pure fluid. A force balance for the lower layer decides whether it is stationary or slides in the upwards- or downwards direction. The position of the deposit surface is governed by the fluid shear stress at the deposit surface. The proposed model represents a major improvement compared to an earlier model. The predictions from the SCSB-model are in good qualitative agreement with experimental results obtained by the author, and results published by research groups in the U.S.A., United Kingdom and Germany. The quantitative agreement is variable, presumably because the SCSB-model is a somewhat simplified description of particle behaviour in inclined annuli. However, the model provides a clearer understanding of the physical background for previously published experimental results. In order to couple the theoretical work with experimental observations, an annular flow loop has been constructed. A characteristic feature in the flow loop design is the application of load cells, which permits  More>>
Authors:
Publication Date:
Dec 31, 1993
Product Type:
Thesis/Dissertation
Report Number:
NEI-DK-3339
Reference Number:
SCA: 020300; PA: DK-99:001154; EDB-99:028436; SN: 99002064624
Resource Relation:
Other Information: DN: EFP-90; TH: Thesis (ph.d.); PBD: 1993
Subject:
02 PETROLEUM; INCLINATION; DRILLING FLUIDS; DIRECTIONAL DRILLING; OIL WELLS; MATHEMATICAL MODELS; WELL DRILLING; HYDRAULIC FRACTURING; CEMENTING; ANNULAR SPACE; FLUID FLOW; FRICTION FACTOR; CUTTINGS REMOVAL
OSTI ID:
317114
Research Organizations:
Danmarks Tekniske Univ., Lyngby (Denmark). Inst. for Kemiteknik; Danmarks Tekniske Univ., Lyngby (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE99730834; CNN: Contract ENS-1313/90-0006; TRN: DK9901154
Availability:
OSTI as DE99730834
Submitting Site:
DK
Size:
[157] p.
Announcement Date:
Mar 22, 1999

Citation Formats

Kurtzhals, Erik. Particle transport in inclined annuli. Denmark: N. p., 1993. Web.
Kurtzhals, Erik. Particle transport in inclined annuli. Denmark.
Kurtzhals, Erik. 1993. "Particle transport in inclined annuli." Denmark.
@misc{etde_317114,
title = {Particle transport in inclined annuli}
author = {Kurtzhals, Erik}
abstractNote = {A new model for the formation and behaviour of deposits in inclined wellbores is formulated. The annular space is divided into two layers, separated by a distinct plane boundary. While the lower layer is taken to consist of closely packed cuttings, the upper layer is presumed to behave as a pure fluid. A force balance for the lower layer decides whether it is stationary or slides in the upwards- or downwards direction. The position of the deposit surface is governed by the fluid shear stress at the deposit surface. The proposed model represents a major improvement compared to an earlier model. The predictions from the SCSB-model are in good qualitative agreement with experimental results obtained by the author, and results published by research groups in the U.S.A., United Kingdom and Germany. The quantitative agreement is variable, presumably because the SCSB-model is a somewhat simplified description of particle behaviour in inclined annuli. However, the model provides a clearer understanding of the physical background for previously published experimental results. In order to couple the theoretical work with experimental observations, an annular flow loop has been constructed. A characteristic feature in the flow loop design is the application of load cells, which permits determination of the annular particle content at steady state as well as under transient conditions. Due to delays in the constructional work, it has only been possible to perform a limited number of investigations in the loop. However, the results produced are in agreement with results published by other research groups. (au)}
place = {Denmark}
year = {1993}
month = {Dec}
}