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Experimental Investigation of Rock Wettability Effect on Carbonate Reservoir Matrix Acidizing

Karimi, Masoud | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48758 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahaboddin; Masihi, Mohsen
  7. Abstract:
  8. Matrix acidizing operation is one of the popular methods of well stimulation in the oil and gas industry which is used to remove near wellbore damage, increase the permeability, hence improve the production rate from the formation. Hydrochloric acid is used in the carbonate reservoirs to remove formation damage and create wormhole deep in the rock. It has been shown that with the proper operating design, significant improvement in the production rate can be obtained. A successful acid operations involves the proper selection of the candidate wells, identify the type of formation damage, stimulation method selection, correct design acidizing scenario, implementation of the technique and evaluation of the operation. Pre-flush is known as the first step of acid stimulation which is used to avoid acid-oil contact, alter the formation wettability to more water-wet in order to react ease the acid reaction with the rock. This operation would remove the organic deposition on the rock surface and cooling the tubing and the well-bore area to reduce corrosion of the down-hole equipment and increase wormhole penetration depth. In this study, the effect of pre-flush fluid on wormhole propagation pattern in acidizing of oil wells has been experimentally investigated. Static and dynamic tests were designed and performed to determine the best pre-flush fluid in terms of the specific criteria. These criteria include: lowering the interfacial tension of pre-flush solvent/oil and quick wettability alteration by considering the effect of flow velocity in near well-bore area. The results showed that the optimum acid volume used for the water-wet case is less that the one for the oil-wet rock. Besides, different solvent types were used in this study resulted in the best pre-flush scenario for acidizing in the carbonate formation
  9. Keywords:
  10. Wormhole ; Wettability ; Acidizing Treatment ; Carbonate Resrevoirs ; Surfactants ; Pre Flush Fluid ; Rock Wettability ; Pre-Fush Surfactant Solution ; Shear Rate Around the Well

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