the role of the annular gap in expandable sand screen completions spe 86463 l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
The Role of the Annular Gap in Expandable Sand Screen Completions SPE 86463. PowerPoint Presentation
Download Presentation
The Role of the Annular Gap in Expandable Sand Screen Completions SPE 86463.

Loading in 2 Seconds...

play fullscreen
1 / 15

The Role of the Annular Gap in Expandable Sand Screen Completions SPE 86463. - PowerPoint PPT Presentation


  • 284 Views
  • Uploaded on

The Role of the Annular Gap in Expandable Sand Screen Completions SPE 86463. . J. Heiland, J. Cook, A. Johnson, B. Jeffryes. Schlumberger Cambridge Research. Outline. Where does the gap come from? How does it influence the mechanics of the completion? experiments theory

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'The Role of the Annular Gap in Expandable Sand Screen Completions SPE 86463.' - liam


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the role of the annular gap in expandable sand screen completions spe 86463

The Role of the Annular Gap in Expandable Sand Screen Completions SPE 86463.

J. Heiland, J. Cook, A. Johnson, B. Jeffryes. Schlumberger Cambridge Research

outline
Outline
  • Where does the gap come from?
  • How does it influence the mechanics of the completion?
    • experiments
    • theory
  • How does it influence the hydraulics?
  • Conclusions.
origins of the gap
Origins of the gap
  • State of the hole after drilling (enlargement, tortuosity, rugosity).
  • Nature of the screen - expansion ratio.
  • Nature of the expansion process - fixed diameter or compliant.
possible consequences of a gap short and long term
Possible consequences of a gap: short- and long-term

Rock failure behind screen with gap:

  • generating load on screen.
  • releasing grains and fines.
    • transport, and erosion of screen
    • plugging of screen
  • changing permeability ( or ).

Fluid flow in annular gap:

  • intervention or production logging more difficult.

This paper addresses the first two of these.

views of the system
Views of the system

Transverse

Collapse; closure; inflow

Inflow; fluid and sand transport

Axial

transverse view experimental
Transverse view - experimental
  • Aim: observe how the gap influences closure and collapse
  • using full-size screens in simulated boreholes in weak rock.
  • Sample is 600 mm OD, 215 mm ID, 1000 mm long. NB: no fluid flow through rock pores.

Camera

Rock

Screen

Pressure

Kerosene

example test 4 full screen close fit
Example: Test 4. Full screen, close fit

Pressure

in bars

(500 bars

= 7250 psi)

transverse view modelling
Transverse view - modelling
  • Simple rock deformation model, incorporating support stress (isotropic stress, perfect plasticity, no pore pressure gradients).
  • Couples deformation of rock to that of screen.
  • Allows study of effects of stiffness, gap, rock properties….
typical results from modelling
Typical results from modelling

Result:Optimum gap for mechanical stability: zero to few mm

axial view modelling
Axial view - modelling
  • Accounts for
    • radial flow from formation into well
    • axial flow along gap
    • radial flow through screen wall
    • axial flow in basepipe.
  • Tracks movement of sand (if annulus velocity is above threshold value).
  • Allows blockage of screen or annulus.
conclusions
Conclusions
  • Most stable system when movement of both grains and larger fragments is prevented.
  • Small gap (few mm) allows mobilization of rock strength to assist stability.
  • Sand movement in annulus prevented by smaller gap, because of lower annulus velocity.
  • Sand accumulations, plugged screen sections, and enlarged holes lead to local hotspots and potential erosion.

Very small or zero gap is therefore best for long-term integrity of completion.