Loading...

Pore Scale Experimental Investigation of The Effective Parameters on the Preformed Particle Gels Transport Mechanisms in Fractured Porous Media

Afsharpour, Sina | 2022

108 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55784 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobeen; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Recognizing the preformed particle gel (PPG) transport mechanisms in fracture and the effective parameters on them, is a necessary knowledge to design a successful gel treatment operation. In this research the transport behavior of PPGs was investigated in two fractured micro-models. During PPG propagation in fracture, the gel dehydration causes to produce a large filtrate volume and sweep the matrix oil. In the fracture/matrix interface, the gel particles can deform, break or shrink, then penetrate a few millimeters into matrix pores and form an impermeable gel cake, which is the main mechanism of conformance control. The effective parameters on PPG transport behavior such as Nano-silica concentration, fracture width, PPG size, brine salinity and gel injection rate were investigated in a dual permeability fractured model. The Nano-silica concentration effects the PPG loss factor and hence the gel transport behavior. The PPGs containing 1%wt Nano-silica has the most loss factor which are more efficient for gel treatment due to reducing injection pressure and required gel volume. At same fracture volume in reservoir, the PPG treatment is more efficient as the fracture width increase. The PPGs with different size can plug the fracture by direct plugging, bridge plugging or both mechanisms, which provide a same plugging efficiency in fracture. the PPGs swollen in higher salinities are a good candidate for PPG treatment due to decreasing the required gel volume, while the gel injection pressure is almost independent of brine salinity. Using the highest possible gel injection rate is suggested to reduce the gel injection volume, while the sear thinning behavior of PPGs prevents from injection pressure increment. The results of single permeability fractured model showed that the PPG treatment can dramatically reduce the fracture permeability, so the injected brine diverts toward matrix and the oil can be produced through fracture. During secondary brine injection, the PPG restarting pressure in fracture must be considered to prevent from gel washout. Also injecting the secondary low salinity brine into half full fractures, can improve the PPG plugging efficiency in such conditions
  9. Keywords:
  10. Performanced Particles Gels ; Fractured Reservoirs ; Micromodel ; Conformance Test ; Feed Speed ; Double Percolation

 Digital Object List

 Bookmark

No TOC