College

Q1 [1 mark]
The top of a formation of interest is at a depth of 6500 ft, and the ROP of the drill bit is 310 ft/day. How long will it take to drill to the top of the formation?

Q2 [1 mark]
A density log shows that the bulk density of a formation is 2.30 g/cc. The density of the rock matrix is 2.62 g/cc, and the density of the fluid in the formation is 0.869 g/cc. Calculate the porosity.

Q3 [1 mark]
We have a structure that is planned to be appraised in the year 2024. We think it might contain a STOTIP of 33 MMstb. The recovery factor is assumed to reach 42%, achieved through a waterflooding project. Determine the proved oil reserves as of today.

Q4 [1 mark]
The reserves to production ratio of a country is 99.3, and their annual production is 32 million stock tank barrels of oil. Determine the reserves available in this country.

Q5 [1 mark]
Calculate the oil formation volume factor given the reservoir volume is 388 million reservoir barrels and the surface volume of fluids is 318 million stock tank barrels.

Answer :

Q1: It will take approximately 21 days to drill to the top of the formation (6500 ft ÷ 310 ft/day = 20.97 days).

Q2: The porosity can be calculated using the formula: porosity = (matrix density - bulk density) ÷ (matrix density - fluid density). Plugging in the given values, the porosity is (2.62 g/cc - 2.30 g/cc) ÷ (2.62 g/cc - 0.869 g/cc) = 0.29 or 29%.

Q3: The proved oil reserves as of today can be calculated using the formula: proved reserves = STOIIP x recovery factor. Plugging in the given values, the proved oil reserves as of today are 13.86 MMstb (33 MMstb x 0.42 = 13.86 MMstb).

Q4: The reserves available in the country can be calculated using the formula: reserves = reserves to production ratio x annual production. Plugging in the given values, the reserves available in the country are 3.17 billion stock tank barrels of oil (99.3 x 32 million stock tank barrels of oil = 3.17 billion stock tank barrels of oil).

Q5: The oil formation volume factor can be calculated using the formula: oil formation volume factor = reservoir volume ÷ surface volume of fluids. Plugging in the given values, the oil formation volume factor is 1.22 (388 million reservoir barrels ÷ 318 million stock tank barrels = 1.22).

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