An apparatus comprising: a degasser operable to release and separate mud gas entrained in drilling fluid discharged from a wellbore at an oil and gas wellsite, wherein the degasser comprises: a gas-liquid separator comprising a separator inlet configured to receive the drilling fluid containing the entrained mud gas, a first separator outlet configured to discharge the mud gas, and a second separator outlet configured to discharge degassed drilling fluid; a venturi ejector operable to move the drilling fluid containing the entrained mud gas from a drilling fluid source to the gas-liquid separator, wherein the venturi ejector comprises a first ejector inlet configured to fluidly connect with a motive gas source, a second ejector inlet configured to fluidly connect with the drilling fluid source, and an ejector outlet fluidly connected with the separator inlet; a gas analyzer fluidly connected with the first separator outlet, wherein the gas analyzer is operable to generate signals or information indicative of type and/or quantity of the mud gas released and separated from the drilling fluid; and a fluid analyzer fluidly connected with the second separator outlet, wherein the fluid analyzer is operable to generate signals or information indicative of properties and/or characteristics of the degassed drilling fluid. a degasser operable to release and separate mud gas entrained in drilling fluid discharged from a wellbore at an oil and gas wellsite, wherein the degasser comprises: a gas-liquid separator comprising a separator inlet configured to receive the drilling fluid containing the entrained mud gas, a first separator outlet configured to discharge the mud gas, and a second separator outlet configured to discharge degassed drilling fluid; a venturi ejector operable to move the drilling fluid containing the entrained mud gas from a drilling fluid source to the gas-liquid separator, wherein the venturi ejector comprises a first ejector inlet configured to fluidly connect with a motive gas source, a second ejector inlet configured to fluidly connect with the drilling fluid source, and an ejector outlet fluidly connected with the separator inlet; a gas-liquid separator comprising a separator inlet configured to receive the drilling fluid containing the entrained mud gas, a first separator outlet configured to discharge the mud gas, and a second separator outlet configured to discharge degassed drilling fluid; a venturi ejector operable to move the drilling fluid containing the entrained mud gas from a drilling fluid source to the gas-liquid separator, wherein the venturi ejector comprises a first ejector inlet configured to fluidly connect with a motive gas source, a second ejector inlet configured to fluidly connect with the drilling fluid source, and an ejector outlet fluidly connected with the separator inlet; a gas analyzer fluidly connected with the first separator outlet, wherein the gas analyzer is operable to generate signals or information indicative of type and/or quantity of the mud gas released and separated from the drilling fluid; and a fluid analyzer fluidly connected with the second separator outlet, wherein the fluid analyzer is operable to generate signals or information indicative of properties and/or characteristics of the degassed drilling fluid.