Solution gas oil ratio

Solution GOR is the ratio of gas evolves from solution to oil. Three methods for estimating solution GOR are presented.

1. Standing (1947)
$$R_s=a_1{\gamma }_g{P}_b{{}^{a_2}}_e{}^{a_{3}T+a_4{\gamma }_{API}}$$ $$\overline{)\begin{array}{cc}\text{Coefficient}& \text{Original}\\ a_1& 30.7343x{10}^{-3}\\ a_2& 1.2048\\ a_3& -2.5245x{10}^{-3}\\ a_4& 34.677x{10}^{-3}\end{array}}$$




2. Vasquez & Beggs (1980)
$$R_s=a_1{\gamma }_g{P}_b{{}^{a_2}}_e{}^{a_3{\gamma }_{API}/(T+460)}$$ $$\overline{)\begin{array}{cc}\text{Coefficient}& \text{Original}\\ \multicolumn{2}{c}{\text{For}{\gamma }_{\text{API}}>\mathrm{30\; :}}\\ a_1& 0.0362\\ a_2& 1.0937\\ a_3& 25.7240\\ \multicolumn{2}{c}{\text{For}{\gamma }_{\text{API}}>\mathrm{30\; :}}\\ a_1& 0.0178\\ a_2& 1.1870\\ a_3& 23.9310\end{array}}$$




3. Al-Marhoun (1988)
$$R_s=a_1{\gamma }_g{}^{a_2}{P}_b{}^{a_3}{\gamma }_o{}^{a_4}{(T+460)}^{a_5}$$ $$\overline{)\begin{array}{cc}\text{Coefficient}& \text{Original}\\ a_1& 1.4903x{10}^{+3}\\ a_2& 2.6260\\ a_3& 1.3984\\ a_4& -4.3963\\ a_5& -1.8600\end{array}}$$