Apparatus and methods for determining in real-time efficiency of extracting gas from drilling fluid at surface

A system for determining an efficiency of gas extraction from a drilling fluid, comprising:

• a chamber for inflow and outflow of the drilling fluid;
• a gas measurement device;
• and
• a processor configured to:
• measure an amount of a gas extracted from the drilling fluid flowing through a chamber at a constant flow rate during a dynamic process;
• obtain a dissolution curve indicative of an amount of the gas remaining in the chamber after the dynamic process;
• measure an amount of the gas drawn from the chamber during a static process subsequent to the dynamic process in which a set volume of the drilling fluid is in the chamber;
• determine an amount of the gas extracted from the drilling fluid during the static process from a difference between the amount of the gas drawn from the chamber during the static process and the amount of the gas indicated by the dissolution curve;
• and
• determine the gas extraction efficiency from a ratio of the amount of the gas extracted from the drilling fluid during the static process and the amount of the gas extracted from the drilling fluid during the dynamic process.

A method of determining an efficiency of extracting a gas from a drilling fluid, comprising:

• measuring, at a gas measurement device, an amount of the gas extracted from the drilling fluid flowing through a chamber at a constant flow rate during a dynamic process;
• evacuating from the chamber the gas remaining in the chamber after the dynamic process;
• obtaining a dissolution curve indicative of an amount of the gas dissipating from the chamber over time during the evacuation process;
• determining an amount of the gas remaining in the chamber from the dissolution curve;
• measuring, at the gas measurement device, an amount of the gas drawn from a set volume of the drilling fluid in the chamber during a static process subsequent to the dynamic process;
• and
• determining, at a processor, the gas extraction efficiency from a ratio of the amount of the gas drawn from the set volume of the drilling fluid during the static process and the amount of the gas extracted from the drilling fluid during the dynamic process and the amount of the gas indicated by the dissolution curve.