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Experimental Performance Analysis of Different Drill-in Fluids in Order to Reduce Formation Damage in Reservoir Sections

Masoomi Azandaryani, Milad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50802 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Goodarznia, Iraj
  7. Abstract:
  8. Formation damage is defined as any process that reduses the reservoir permeability relative to its normal state. Two major causes of this problem are filtrate and solid invasion into the pore spaces of reservoir rock.Therefore, the drilling fluid used for drilling the reservoir sections should prevent such a problem as much as possible.The goal of this study is to optimize the weighting additive particle size distribution to prevent permeability damage in one of the southern Iranian oil fields. By analizing the capillary pressure data of core samples, it seems that fracture presence in rock matrix leads to poor quality of mudcake, resulting peremabilty reduction in near wellbore region. Regarding pore size disttibution of reservoir rock and using Ideal Packing Theory, the blending proportion of several bridging agents was adjusted and then by measuring return permeability of plugs, it was determined that a combination of different particle size can prevent severe damage.Ressults show that change of bridging agents particle size does not affect the drilling mud properties and while reduces the mudcake thickness it also improve its quality. It has been confirmed from experimental results that the damage has not been reversible without the use of a completion fluid. Potassium Formate, as a substitute for calcium carbonate was used as a weighting agent, which of course was not as effective as calcium carbonate. It was also observed that in this case study the effect of the particle size adjustment in oil base mud is greater than water base mud
  9. Keywords:
  10. Particles Size Distribution ; Formation Damage ; Pore Size ; Calcium Carbonate ; Return Permeability ; Drill-In Fluid

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