A sand production prediction model for weak sandstone reservoir in Kazakhstan

Ainash Shabdirova, Nguyen Hop Minh, Yong Zhao

Research output: Contribution to journalArticle

Abstract

Weakly consolidated reservoirs are prone to sand production problem, which can lead to equipment damages and environmental issues. The conditions for sand production depend on stresses and properties of rock and fluid. Accurate sand volume estimation is, however, still a challenging issue, especially for reservoirs in weak formations. The weak reservoirs containing viscous or heavy oil are mainly discovered in shallow depths in Kazakhstan, with moderate temperature and pressure. Many prediction models developed for open-hole completions where the reservoir materials usually possess certain strength are not applicable for the local reservoirs where the materials are significantly weaker even if casing is used to support the wellbore with oil produced through the perforation tunnels. In this context, a prediction model was proposed where the volume of the produced sand was estimated as the volume of the plastic zone of the failed materials surrounding the perforation tunnels. The model assumes an evolving truncated conical shape for the damage zone and takes into account stress distributions and shear failure in this zone. Then, the proposed model was used to estimate sand volumes in 20 wells during oil production with sequential increase of flow rates. The predictions match well with the measured sand volumes in a local oil field. Finally, a sensitivity analysis was conducted on the model performance. It shows that the permeability of the plastic zone was the most significant controlling factor in the prediction results.

Original languageEnglish
JournalJournal of Rock Mechanics and Geotechnical Engineering
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Sandstone
Sand
sandstone
sand
prediction
perforation
Tunnels
tunnel
Oil well production
plastic
Plastics
damage
Petroleum reservoirs
Oil fields
heavy oil
environmental issue
oil production
oil field
Sensitivity analysis
sensitivity analysis

Keywords

  • Perforation tunnel
  • Plastic zone
  • Sand production
  • Shear failure
  • Weak sandstone

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

A sand production prediction model for weak sandstone reservoir in Kazakhstan. / Shabdirova, Ainash; Minh, Nguyen Hop; Zhao, Yong.

In: Journal of Rock Mechanics and Geotechnical Engineering, 01.01.2019.

Research output: Contribution to journalArticle

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