Flow-Back Results at Cambay-77H in Gujurat Suggest a High Performance Well
Oilex Ltd reported Thursday that Cambay-77H well in the Cambay Production Sharing Contract in Cambay Basin, Gujurat, India continues to produce light crude oil and gas as the well recovers frac water during clean-up.
Cambay-77H crude oil recovered from flow-back operations is currently being transported to a nearby refinery for sale, where it attracts a price similar to Bonny Light Crude. Gas produced concurrently with crude oil during flow-back continues to be flared to ensure safety of all wellsite personnel.
Samples of the oil, gas and water have been shipped to facilities for analysis. Preliminary analyses of the recovered water have been received and confirm that the water is consistent with frac water and not formation water. Oilex is currently awaiting analysis results for the oil and gas samples.
Oilex is also pleased to confirm the following field measurements recorded during flow-back and clean-up of Cambay-77H:
- Light crude oil/condensate average of API 48.3 degree
- Highest API value - 50.1 degree and lowest value of 43.6 degree
- Hydrocarbon liquid to gas ratio is calculated to be:
- Cumulative basis - ~120 barrels per million standard cubic feet (MMscf)
- Average while flowing the well – ~130 barrels per MMscf
- This is ~300 percent higher than anticipated as part of the well design
- Downhole pressure and pressure build-up surveys conducted during the initial flowback operation have been compared to frac operations pressure data and confirm the following:
- Original reservoir pressure from pseudo-radial flow results of the micro-frac was calculated to be ~4,330 psi, as announced July 2
- Flowing Bottom Hole Pressure (FBHP) in the horizontal section was measured to be between~2,250psi to 2,500psi
The data collected to date during flow-back operations are interpreted by Oilex as follows:
- The light crude oil is consistently measured in the range of API 45 – 50 degrees and therefore may be considered a condensate. However as seen in the accompanying photograph, Cambay-77H liquid hydrocarbon has the appearance of other Cambay crudes. It is of high quality and the laboratory results will provide more information
- On the basis of the recent laboratory analysis, the water being recovered is frac water. To date, no aquifer has been identified nor has any gas-water contact (GWC) or oil-water contact (OWC) been intersected in the 39 well penetrations of the Y zone Eocene reservoir section within the Cambay PSC
- Pressure data indicates a partial clogging of the well bore perforations. This situation has occurred in frac’d vertical wells in the Cambay Basin and can be commonly encountered in the industry. At Cambay-77H, partial blockage appears to be caused by residue from the breakdown of the polymer gel, used in the frac fluid, and very fine particulate matter. This can be effectively treated using proven industry techniques. As such, Oilex, on behalf of the Cambay Joint Venture, is preparing a remedial treatment plan using coiled tubing to deliver a chemical flush to clear possible blockages that may exist. This type of remedial treatment is common practice and not unexpected for the first well of this design in India
Managing Director of Oilex, Ron Miller, said:
“It is a nice sweetener to continue production of crude oil which sells for an attractive price during flow-back and clean-up as some North American wells only flow water during early clean-up. To date, the data collected continues to support Cambay-77H as capable of being a high performance well compared to previous well designs consisting of vertical or deviated wells with single fracs in the Cambay Basin. As the first well of this type in the Cambay Basin to “flow-back and clean-up”, it is not unexpected for some remedial work as part of those operations.”
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