Novel Hydraulic Fracturing Technique Application in Egypt
- Mourad Emam (Shell) | Roger Knight (Shell) | Pearl Bezboruah (Shell) | Ahmed Sweedan (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition and Conference, 10-13 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2014. Society of Petroleum Engineers
- HiWay, Stimulation, Methanol
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Shell Egypt and the joint Venture partners Vegas and GDF Suez are currently developing the Karam gas field by drilling 4 new wells, working over two existing wells and installing surface facilities to process and export this new production. The field is operated by Bapetco (a Shell/EGPC Joint Venture) on behalf of the Joint Venture Partners.
The Abu Roash G reservoir is approximately 4400 meters deep and with reservoir pressures and temperatures in excess of 9500 psi and 310 deg Fahrenheit respectively it is technically challenging. The reservoir is over pressured and Calcium Bromide brine was required to kill the wells for the work over activities.
Post-workover well productivity was significantly below expectations with very high well skins observed. The root cause for the productivity loss was believed to be from formation damage due to losses during the workover operations but relative permeability effects (water blocking) was also suspected as a potential productivity damage mechanism. Laboratory tests were carried out which showed the creation of a sever emulsion between the completion fluid used during the workover (CaBr, CaCl, CaCO3) and reservoir fluids.
A novel technical solution, a methanol Channel Fracturing treatment was developed to restore well productivity. This was a world first application of this treatment utilizing the Channel Fracturing treatment technology to reduce the required pump rate/pressure to place the treatment and methanol as the carrying fluid to minimize the water block effect.
The well was tested after the methanol Channel Fracturing stimulation at a constrained rate of 35 MMscf/d and 3000 bpd condensate compared to the pre-stimulation gas rate of 2 MMscf/d.
This paper will discuss planning, execution and production results making recommendations to improve the effectiveness of future Channel Fracturing applications.
Karam-3& 4wells were drilled as part of 4 wells campaign to explore and appraise the gas potential in Karam filed. The wells succeeded to find large gas volumes in Kharita reservoir which has high Co2 percentage. The wells also found sweet gas in Abu Roash G reservoir but with smaller volumes which could be produced through the existing facility.
Abu Roash G reservoir was tested in Karam 3 with an initial rate of 23 MMscf for few days and then the well was shut-in due to an integrity issue in the completion. The other well Karam 4 was tested only on Kharita formation and Abu Roash G formation was not tested due to an integrity issue also in the completion, however from log response it was expected that Abu Roash G in Karam 4 should produces at good initial rate similar to Karam 3 as the sand quality looks similar in both wells from the logging data. Fig.1 shows a correlation panel between Karam 3 & 4 and the sand quality in both wells.
|File Size||8 MB||Number of Pages||9|