5-14. The Crown Zellerbach No. 1 was the discovery well in the Hooker (Rodessa)

Question

5-14. The Crown Zellerbach No. 1 was the discovery well in the Hooker (Rodessa) Field. The reported production during the first year of production is given below. How would you classify this reservoir fluid? Why? Date Stock-tank Liquid Gravity, AP Monthly Production Oil, STB Water, STB Gas, Mscf Apr 1984 May 1984 Jun 1984 Jul 1984 Aug 1984 Sep 1984 Oct 1984 Nov 1984 Dec 1984 Jan 1985 Feb 1985 Mar 1985 112 1,810 2,519 3,230 3,722 2,780 3,137 2,291 2,108 1,799 1,422 1,861 3,362 12,090 54,809 64,104 94,419 279 119,151 248 100,235 270 113,359 210 80,083 71,412 60,279 57,626 186 60,330 180 240 54 56 56 56 56 56 217 203 196

Explanation / Answer

Typically there are mainly 5 types of reservoir fluid black oil, volatile oil,condensate (retrograde gas),wet gas & dry gas.Primary method for determining & quantifying fluid type is laboratory analysis but stock tank gravity & initial oil production are other useful indicators.

classification: Retrograde condensate gas

reason:

as the stock tank gravities are between 40o to 60o API

& lower limit for retrograde condensate gas for production of initial gas oil ratio is 3300 scf/STB & upper limit is not well defined value over 150000scf/STB.

its far away from black oil & volatile voil

decision need to made between retrograde or wet gas ,but from production trend we can see that it can be classified as retrograde condensate gas.

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