Page 82: of Offshore Engineer Magazine (May/Jun 2014)

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Production

Subsurface and well planning reservoir simulation model for Prosperidade feld ofshore of Mozambique. Image: Anadarko.

an art,” Pande says. “It depends on the Anadarko ran at least 10 fow tests of Pande says. “The differences are small, operator’s experience and judgement.” three to seven days in duration, with but they’re very discernible. And this is

The art work begins early. Anadarko’s each test producing up to 120MMscf/d, such a huge reservoir, such a large asset,

Mozambique exploration program started events which resulted in spectacular we had to fgure out how to account for with a geologic model of the Rovuma video posted on You Tube by Anadarko. that.”

Basin based on knowledge of similar Flow testing a well without producing Estimates of recoverable gas at basins and how they matched up with signifcant pressure drop is encouraging Prosperidade grew rapidly as drilling

Rovuma. Seismic surveys helped identify because it indicates a sizable reservoir. of exploration and appraisal wells and potential subsurface accumulations of Flow testing in conjunction with pres- modeling continued. The estimate was hydrocarbons. sure monitoring at other wells can start to 6Tcf in August 2011. It climbed to 10Tcf

Then, in February 2010, the frst defne the actual geographic dimensions in October. In November 2012, after wildcat well came in big. Windjammer, of the reservoir. the Camarao discovery 5mi. south of about 30mi. east of Palma, found 555ft “We needed to really establish how Windjammer found 380ft of net pay and of net natural gas pay layered over more continuous this reservoir was and we two new sand layers, the estimate soared than 1200ft of Oligocene and Paleocene establish continuities through interfer- to 15-30+ Tcf. sands after reaching 16,930ft total depth ence tests,” Pande says, describing a Information from drilling and testing in water 4800ft deep. process in which fowing one well and was so good and the model, by this time,

Next, also in 2010, came the watching the pressure impact on another so promising, that Anadarko was able to

Barquentine discovery 2mi. to the well some distance away indicates attract a new investor into the project.

southwest of Windjammer (308ft of net whether they are connected. India’s OVL paid US$2.64 billion for a pay in Oligocene and Paleocene sands) How quickly that pressure response 10% stake in 2013, reducing Anadarko’s and the Lagosta fnd (550ft of net pay in shows up provides additional informa- share to 26.5%. The original partners in

Oligocene and Eocene sands) 14mi. to the tion about how well the fuids in the the project were Mitsui, BPRL, Videocon southeast. reservoir will fow. Mozambique, PTT E&P and ENH,

At that point, as exploration contin- These pressure measurements are Mozambique’s national oil company.

ued, the appraisal phase began in earnest incredibly sensitive. In the case of The results also led Anadarko and to gather more data to feed the computers Prosperidade, the analysis took into Italian giant Eni, which operates and build the models of Prosperidade. account the effect on reservoir pressure Mozambique exploration Area 4 adjacent “In 2012, we conducted the single of Mozambique’s tides, which can be 12ft to Anadarko’s Area 1, to agree in late most extensive deepwater testing pro- or more. 2012 to partner in building an LNG plant. gram in Mozambique that was comprised “You actually have more water on top Prosperidade straddles Area 1 and Area 4 of well tests and interference tests,” of the sea foor from tides, and we can Delivery of the frst LNG cargo is tar-

Pande says. actually see this in the pressure data,” geted for 2018.

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