Abstract:
Adhi field has been producing gas condensate from Tobra and Khewra sandstone reservoirs since 1990. Most of Tobra and Khewra wells have low productivity, primarily due to low reservoir permeability (0.5 to 20 mD), high skin and near well-bore condensate banking. This paper gives the case history of the first hydraulic fracturing treatment in the Potwar region that was executed on Adhi field’s well Adhi-18. This was also the first fracturing job in Pakistan carried out with rig on well, therefore, detailed HAZOP was conducted by the operator and the service company experts. In order to measure the in-situ stresses and calibrate the stress model for fracturing treatment design, stress measurements were carried out first time in Pakistan using dual packer MDT tool. Based on MDT stress test results as well as available geological and petrophysical data, datafracs were designed and completed successfully without facing any significant operational problem. Datafracs provided valuable formation and fracture behavior information for fracturing treatment design refinement. Post frac deliverability has increased by more than 3 times after fracturing. The first hydraulic fracturing treatment success is a milestone for designing and conducting more fracturing treatment in the Potwar region. Some well controlling problems were encountered during running in the completion after the frac jobs. Unfortunately, the use of loss control material (LCM) could not be avoided, which might have induced some damage to fracture conductivity. Therefore, in future fracturing treatments it is recommended to thoroughly design the well killing operation to minimize the damage. Post fracture pressure build-up data will be recorded and analyzed and the results will be used to quantify the fracture effectiveness and to provide guidelines for the improvements of future fracture designs.
Page(s):
211-229
DOI:
DOI not available
Published:
Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: 0, Year: 2007