Gas-Oil Ratio (GOR)
Compute the gas-oil ratio (GOR) by dividing the produced gas volume by the oil volume, in scf/STB (standard cubic feet per barrel). It is a central petroleum-production parameter: it indicates how much gas accompanies the oil, characterizes the reservoir fluid type (black oil, volatile, gas-condensate) and sizes the surface separation equipment. A rising GOR can signal gas-cap breakthrough at the well. Enter the gas and oil volumes.
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Razão gás/óleo (GOR)
A razão gás/óleo (GOR) — pés cúbicos-padrão de gás por barril de óleo — é uma das primeiras coisas que se mede num poço de petróleo, e diz muito sobre o fluido lá embaixo. GOR baixo (<500 scf/STB) indica óleo 'preto', pesado e com pouco gás dissolvido; à medida que sobe, passa por óleo volátil, e GOR muito alto caracteriza gás-condensado ou gás. O GOR define o projeto da separação na superfície (quantos estágios de separador, dimensionamento de compressores) e a economia do campo (gás e óleo têm valores diferentes). Durante a vida do poço, um GOR que cresce inesperadamente é um sinal de alerta: pode indicar que a pressão caiu abaixo do ponto de bolha (liberando gás antes dissolvido) ou que a capa de gás do reservatório está 'cone-ando' em direção ao poço — exigindo ação. Informe os volumes de gás e de óleo.
Related Tools
Oil in Place (OOIP)
Compute a reservoir's original oil in place (OOIP) by the volumetric method, OOIP = 7758·A·h·φ·(1−Sw)/Boi, in stock-tank barrels (STB). It combines the reservoir area (acres), the porous thickness (ft), the porosity (φ), the water saturation (Sw) and the oil formation volume factor (Boi). The constant 7758 converts acre-feet into barrels. It is the basis of any oil-field evaluation. Enter the area, thickness, porosity, water saturation and Boi.
Oil Formation Volume Factor (Bo)
Compute the oil formation volume factor (Bo) by dividing the volume the oil occupies at reservoir conditions by the volume it occupies at the surface (stock-tank barrels). Bo is always greater than 1 because, in the reservoir, the oil is hot and has dissolved gas, occupying more space; as it rises and loses gas and heat, it shrinks. It is essential to convert reservoir volumes into surface production. Enter the volumes at reservoir and surface conditions.
Reservoir Net Pay
Compute a reservoir's net pay (net productive thickness) by multiplying the gross interval thickness by the net-to-gross ratio (N/G), the fraction of rock with enough porosity and permeability to produce. Shale layers, tight rock or water zones are discounted. The net pay, not the total thickness, is what enters the oil and gas volume calculations. Enter the gross thickness and the net-to-gross ratio.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.