SPE Production & Operations
Volume 27, Number 1, February 2012, pp. 87-93

SPE-133172-PA

Critical Oil Rate and Well Productivity in Cold Production From Heavy-Oil Reservoirs

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DOI  More information 10.2118/133172-PA http://dx.doi.org/10.2118/133172-PA

Citation

  • Guo, B., Gao, D., Ai, C., and Qu, J. 2012. Critical Oil Rate and Well Productivity in Cold Production From Heavy-Oil Reservoirs. SPE Prod & Oper  27 (1): 87-93. SPE-133172-PA. http://dx.doi.org/10.2118/133172-PA.

Discipline Categories

  • 1.5 Completion Planning, Design and Installation
  • 1.5.4 Completion Equipment
  • 5.1 Design and Optimization
  • 5.1.2 Downhole Tools and Equipment
  • 5.2 Artificial Lift Systems
  • 5.2.2 Electric Submersible Pumps

Keywords

  • CHOPS, Heavy Oil, Cold Production, Unconsolidated , Sandy Well

Summary

Cold heavy-oil production with sand (CHOPS) has been widely used for recovering heavy oil from unconsolidated sandstones (UCSs). Although this technology is considered to be mature in some oil fields in Canada, there are some technical issues that need to be addressed when this technology is transferred to fields in other parts of the world. These issues are primarily related to the variations in local geological and reservoir conditions. One of the concerns is whether the designed well production rate is high enough to self-clean the wellbore against sand accumulation. During planning of CHOPS completions, it is imperative to know if the designed fluid-production rate will be adequate to carry sand to surface, especially when horizontal wells are employed, where a significant amount of sand can accumulate in the horizontal wellbore that can kill the well. However, it is not clear what constitutes the "adequate" fluid-production rate. A theoretical investigation of sand transport in heavy oil was conducted in this study. A critical fluid-production rate was defined to quantitatively describe the "adequate" production rate required to carry sand to surface in vertical, inclined, and horizontal wells. Also developed in this study is a CHOPS-well deliverability model based on self-stimulation of reservoir and oil/water/gas/solid four-phase flow in the production string. Combined use of the critical-production-rate model and the well-deliverability model allows for optimal selection of pumps that will ensure the smooth production of fluids in CHOPS operations. This paper provides petroleum engineers with essential knowledge and information for planning CHOPS well completions.

© Copyright 2012 Society of Petroleum Engineers

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History

  • Original manuscript received: 29 September 2010
  • Meeting paper published: 20 September 2010
  • Revised manuscript received: 21 May 2011
  • Manuscript approved: 7 July 2011
  • Published online: 16 January 2012
  • Version of record: 28 February 2012