How do you calculate stock tank oil initially in place?

How do you calculate stock tank oil initially in place?

4.2: Estimation of Stock Tank Oil Originally In-Place, STOOIP Using the Volumetric Method

1. V=Vgrv(¯hn/¯hg)ˉϕ ¯SpC ¯Bp.
2. G=Vgrv(¯hn/¯hg)ˉϕ ¯Sg ¯Bg.
3. W=Vgrv(¯hn/¯hg)ˉϕ ¯Sw5.615 ¯Bw.

How do you calculate recoverable oil?

Sw = water saturation (decimal, not percent) Boi = formation volume factor = 1.05 + (N × 0.05), where N = number of ft3 of gas produced per bblbarrels of oil (gas-oil ratio or GOR). For example, if a well has a GORgas-oil ratio of 1,000, then Boi = 1.05 + (10 × 0.05) = 1.1.

What is initial oil in place?

What Does Oil Initially in Place Mean? Oil initially in place (OIIP) is the amount of crude oil first estimated to be in a reservoir. Oil initially in place differs from oil reserves, as OIIP refers to the total amount of oil that is potentially in a reservoir and not the amount of oil that can be recovered.

How do you calculate oil pore volume?

Pore Volume = Net Volume x Porosity. Hydrocarbon Volume = Pore Volume x (1 Water Saturation) STOOIP/STOIIP = Hydrocarbon Volume / Oil Formation Volume Factor. Recoverable Oil Volume = STOIIP x Oil Recovery Factor.

How do you calculate gas initially?

5.2: Estimation of Original Gas In-Place, OGIP, Using the Volumetric Method

1. Equation 5.01a. or, equivalently (after applying the Saturation Constant): G=Vgrv(¯hn/¯hg)ˉϕ(1−¯Swι)¯Bgι
2. Equation 5.01b. Where: G is the original-gas-in-place of the reservoir, SCF.
3. Equation 5.02. Where: Vgrv is the gross rock volume, ft.

What is reserve estimation?

Introduction Reserves estimation is one of the most essential tasks in the petroleum industry. It is the process by which the economi- cally recoverable hydrocarbons in a field, area, or region are evaluated quantitatively. Consequently, the industry’s record of properly predicting reserves has been mixed.

What is the volume of oil?

In the oil industry, an oil barrel is defined as 42 US gallons, which is about 159 litres, or 35 imperial gallons.

What is original oil in place?

Oil initially in place (OIIP) is the amount of crude oil first estimated to be in a reservoir. Oil initially in place differs from oil reserves, as OIIP refers to the total amount of oil that is potentially in a reservoir and not the amount of oil that can be recovered.

How do you calculate oil in place by volumetric method?

Volumetric Calculations. I. Calculating Oil in Place by the Volumetric Method Oil in place by the volumetric method is given by: Where: N(t) = oil in place at time t, STB V. b = 7758 A h = bulk reservoir volume, bbl 7758 = bbl/acre-ft A = area, acres h = thickness, ft φ(p(t)) = porosity at reservoir pressure p, fraction S.

How do you calculate recoverable oil reserves?

The basic equation used to calculate recoverable oil reserves is. where RF = recovery factor, which equals RF P + RF S. The primary recovery factor, RF P, is estimated from the type of drive mechanism (Table 2).

How is oil initially in place (OIP)?

The numbers for the aforementioned factors are established by conducting a series of test drills around the reservoir. Oil initially in place is known more simply as oil in place (OIP). It is also referred to by a few variations.

What are original oil in place and original gas in place?

To better understand reserves estimation, a few important terms require definition. Original oil in place (OOIPoriginal oil in place) and original gas in place (OGIPoriginal gas in place) refer to the total volume of hydrocarbon stored in a reservoir prior to production.