Well monitoring, sensing, control and mud logging on dual gradient drilling

A method comprising:

• defining each of a seawater and a mud circulatory system associated with a wellbore, the seawater circulatory system comprising a riser fluid circulating therein, and the mud circulatory system comprising a drilling fluid circulating therein;
• defining an end point for each of the seawater and mud circulatory systems;
• defining fluid composition for each of the riser fluid and drilling fluid;
• defining fluid density for each of the riser fluid and drilling fluid;
• monitoring position of a drill string that includes at least a portion of any one or more of the seawater and mud circulatory systems;
• monitoring flow rate of the riser fluid in and out of the first circulatory system;
• monitoring flow rate of the drilling fluid in and out of the second circulatory system;
• and
• simultaneously tracking any one or more system parameters for each of the seawater and mud circulatory systems, each system parameter being selected from the group consisting of fluids;
• cuttings;
• gas;
• changes in density;
• sweeps;
• cement;
• tracer material;
• number of trips;
• bit depth;
• hole depth;
• fluid flow rate;
• fluid volume in any discrete portion of the wellbore;
• torque;
• pressure;
• equivalent circulating density;
• drive, inlet pressure, or stroke rate of any one or more pumps within each circulatory system;
• top-of-mud;
• subsea rotating device (SRD) bypass setpoint;
• pressure above the SRD;
• pressure below the SRD;
• SRD differential pressure;
• mud temperature;
• mud conductivity;
• and any combination thereof.

A software program including executable instructions stored on a tangible medium that, when executed, cause at least one processor of a computer to:

• define each of a seawater and a mud circulatory system associated with a wellbore, the seawater circulatory system comprising a riser fluid circulating therein, and the mud circulatory system comprising a drilling fluid circulating therein;
• define an end point for each of the seawater and mud circulatory systems;
• define fluid composition for each of the riser fluid and drilling fluid;
• define fluid density for each of the riser fluid and drilling fluid;
• monitor position of a drill string that includes at least a portion of any one or more of the seawater and mud circulatory systems;
• monitor flow rate of the riser fluid in and out of the first circulatory system;
• monitor flow rate of the drilling fluid in and out of the second circulatory system;
• and
• simultaneously track any one or more system parameters for each of the seawater and mud circulatory systems, each system parameter being selected from the group consisting of fluids;
• cuttings;
• gas;
• changes in density;
• sweeps;
• cement;
• tracer material;
• number of trips;
• bit depth;
• hole depth;
• fluid flow rate;
• fluid volume in any discrete portion of the wellbore;
• torque;
• pressure;
• equivalent circulating density;
• drive, inlet pressure, or stroke rate of any one or more pumps within each circulatory system;
• top-of-mud;
• subsea rotating device (SRD) bypass setpoint;
• pressure above the SRD;
• pressure below the SRD;
• SRD differential pressure;
• mud temperature;
• mud conductivity;
• and any combination thereof.