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OIL RESERVES CLASS 05 CLASS 04

CLASS 05

OIL RESERVES

Hydrocarbon reserves are "the volumes of crude oil, condensate, natural gas, natural gas liquids and associated substances that can be recovered commercially from known accumulations from a given date forward" (Directorate General of Exploration and Land Reserve, Ministry of Energy and Petroleum, 2005). According to this concept, has made an effort to classify and standardize the methods to be used to quantify these reserves and thus ensure that the values \u200b\u200bof oil volume are internationally comparable.

There are various methods to quantify the volumes of oil and gas underground. These are mainly divided into Deterministic and Probabilistic .

deterministic methods include:

1. Volumetric method.

Here

known formulas used to calculate hydrocarbon Origical Site (POES, GOES or COES).

POES = 7758 * Vb * O * Soi / Boi

GOES = 43560 * Vb * O * SGI / BGI

2. Calculation of production performance curves.

used in this case curves vs daily production. Time or vs. Daily Production. Cumulative production and through analysis and extrapolation of the behavior of the same is possible to estimate the remaining volume of hydrocarbon reserves and reservoir known

3. Material balance calculation.

This method has already been discussed, it is necessary to have the pressure history, production and reservoir PVT data to calculate the original oil in place.

4. Calculation by numerical simulation.

For the application of numerical simulation using computerized mathematical models to study the site and simulate the processes and comprtamiento it.

The deterministic or probabilistic methods are not used when study conditions are very complex or difficult and costly to evaluate accurately. In this case we selected a representative sample of the deposit and based on statistical probability and the results are generalized for the entire reservoir.