Influence of formation fluid viscosity on hydrofracturing efficiency

Authors: V.G. Salimov, R.R. Ibatullin, A.V. Nasybullin, O.V. Salimov (TatNIPIneft, RF, Bugulma)

Key words: hydraulic fracturing, viscosity of formation fluid, fracture design.

The hydrofracturing modeling performed allowed estimating the well deliverability as a function of the formation fluid viscosity and the reservoir drainage area geometry. It has been found that a horizontal well, where no multi-stage hydrofracturing is planned, shall be parallel to the long axis of the reservoir area. The areas shall rather be rectangular than isometric. For a horizontal well with transverse hydraulic fractures, a reservoir drainage area shall preferably be rectangular and oriented parallel to fractures. An optimum reservoir aspect ratio can also add to production. It has been found that the higher the formation fluid viscosity, the larger aspect ratios, and, consequently, the higher the production rate. For Tatarstan oil fields, the number of transverse fractures shall be at least four. So, when planning hydrofrac treatment, the orientation of the fracture is first determined to ensure the highest possible productivity, then, the orientation of the horizontal wellbore and the reservoir drainage area shape are selected.

  

Key words: hydraulic fracturing, viscosity of formation fluid, fracture design.

The hydrofracturing modeling performed allowed estimating the well deliverability as a function of the formation fluid viscosity and the reservoir drainage area geometry. It has been found that a horizontal well, where no multi-stage hydrofracturing is planned, shall be parallel to the long axis of the reservoir area. The areas shall rather be rectangular than isometric. For a horizontal well with transverse hydraulic fractures, a reservoir drainage area shall preferably be rectangular and oriented parallel to fractures. An optimum reservoir aspect ratio can also add to production. It has been found that the higher the formation fluid viscosity, the larger aspect ratios, and, consequently, the higher the production rate. For Tatarstan oil fields, the number of transverse fractures shall be at least four. So, when planning hydrofrac treatment, the orientation of the fracture is first determined to ensure the highest possible productivity, then, the orientation of the horizontal wellbore and the reservoir drainage area shape are selected.

  



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