Gas composition from a drilling fluid density change

A system comprising:

• a memory;
• and
• one or more processors that execute instructions out of the memory to:
• identify a set of metrics of an initial composition of a drilling mud provided to a wellbore, the set of metrics including a first metric associated with a fraction of a clay and a second metric associated with a fraction of a solid included in the initial composition of the drilling mud provided to the wellbore;
• calculate a density of the initial composition of the drilling mud as a function of the first metric associated with the fraction of the clay and the second metric associated with the fraction of the solid included in the initial composition of the drilling mud:
• wherein the initial composition of the drilling mud is changed to a changed composition of the drilling mud after the initial composition of the drilling mud is provided to the wellbore;
• wherein the changed composition of the drilling mud includes a fraction of gasses and an estimated rock mass;
• and
• wherein the density of the initial composition of the drilling mud is calculated by determining a constituent volumetric density of each of the clay, the solid, and a fluid within the initial composition based on the fraction of each of the clay and the solid included in the initial composition and a volumetric density of each of the clay and the solid included in the initial composition;
• calculate a density of the changed composition that includes the fraction of gasses and the estimated rock mass;
• identify a density difference by subtracting the density of the changed composition from the density of the initial composition;
• identify the fraction of gasses included in the changed composition based on the density difference and the estimated rock mass;
• predict a composition of the fraction of gasses included in the changed composition based on the density difference;
• and
• adjusting a drilling operation based on the predicted composition of the fraction of gasses.

A non-transitory computer-readable storage medium having embodied thereon instructions executable by one or more processors to implement a method comprising:

• identifying a set of metrics of an initial composition of a drilling mud provided to a wellbore, the set of metrics including a first metric associated with a fraction of a clay and a second metric associated with a fraction of a solid included in the initial composition of the drilling mud provided to the wellbore;
• calculating a density of the initial composition of the drilling mud as a function of the first metric associated with the fraction of the clay and the second metric associated with the fraction of the solid included in the initial drilling mud:
• wherein the initial composition of the drilling mud is changed to a changed composition of the drilling mud after the initial composition of the drilling mud is provided to the wellbore;
• wherein the changed composition of the drilling mud includes a fraction of gasses and an estimated rock mass;
• and
• wherein the density of the initial composition of the drilling mud is calculated by determining a constituent volumetric density of each of the clay, the solid, and a fluid within the initial composition based on the fraction of each of the clay and the solid included in the initial composition and a volumetric density of each of the clay and the solid included in the initial composition;
• calculating a density of the changed composition that includes the fraction of gasses and the estimated rock mass;
• identifying a density difference by subtracting the density of the changed composition from the density of the initial composition;
• identifying the fraction of gasses included in the changed composition based on the density difference and the estimated rock mass;
• predicting a composition of the fraction of gasses included in the changed composition based on the density difference;
• and
• adjusting a drilling operation based on the predicted composition of the fraction of gasses.