Improved Techniques for Fluid Diversion in Oil Recovery – 1995

R.S. Seright – 1995

Abstract

Final report of the three-year project on improved fluid diversion techniques. Topics include gel properties in fractures and optimization of gel placement in fractured systems, investigation of why gels selectively reduce water permeability more than oil, comparison of microorganisms and particulates as blocking agents, and assessment of foams for superior placement properties. Gels remain the most technically mature and field-proven fluid diversion technology across the widest range of reservoir conditions. Microorganisms show less reliable and controllable placement than gels. Technology was transferred via SPE publications and industry reviews attended by 27 people from 13 organizations.

Key Takeaways

  • Gel extrusion through fractures is characterized: preformed Cr(III)-acetate-HPAM gels propagate and plug fractures effectively, with gel dehydration limiting matrix invasion.
  • Microorganisms show less reliable and controllable placement behavior than chemical gels and are not recommended over gels for selective fracture plugging.
  • Particulates can selectively enter high-permeability channels but cannot achieve the deep penetration of polymer solutions, limiting their effectiveness as standalone blocking agents.
  • Foams offer excellent mobility control in gas-injection scenarios but face stability limitations and are not a substitute for gels in fracture-dominated water shutoff projects.
  • Polymer and gel systems remain the most technically mature and field-proven fluid diversion technology across the widest range of reservoir conditions assessed in this project.
Read Article

Related Articles