首页| Effects of wellbore irregularity on primary cementing of horizontal wells, Part 1: Large scale effects

Effects of wellbore irregularity on primary cementing of horizontal wells, Part 1: Large scale effects

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We study the effect of borehole ovalization and large-scale irregularities during primary cementing of a horizontal section of well. We use a two-dimensional gap-averaged model that can compute the displacement within varying annular geometries: both eccentric and elliptic. We study displacement of a drilling mud by a spacer within both, elliptical-uniform cross-sections and those which vary irregularly in the axial direction, based on field caliper measurements. The combination of eccentricity and ellipticity adjusts the azimuthal positioning of the wide and narrow gaps producing a variety of characteristic behaviours, e.g. the front may advance in the form of 2 peaks at off-centre positions. The irregularities can induce additional azimuthal flow when compared to uniformly circular wellbores. In cases when the displaced mud has a significant yield stress, the displacement can leave patches of residual mud at the top of eccentric horizontal wellbores: not usually found without ellipticity.

Wellbore irregularityEnlargementsBreakoutBorehole ovalizationCementing2D gap-averaged model

A. Renteria、P. Sarmadi、C. Thompson

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Department of Mechanical Engineering University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC, Canada V6T 1Z4

Department of Mathematics, University of British Columbia, 1984 Mathematics Road, Vancouver, BC, Canada, V6T 1Z2

Geonomic Technologies, 7523 Flint Rd. SE, Calgary, AB, Canada, T2H 1G3

2022

10.1016/j.petrol.2021.109581

Journal of Petroleum Science & Engineering

Journal of Petroleum Science & Engineering

ISSN：0920-4105
年,卷(期)：2022.208
  • 10
  • 49