Separating solids from liquids in a drilling fluid

A drilling fluid shaker screen system, comprising:

• a screen assembly that comprises a screen mounted to a funnel, the screen comprising a plurality of screen sections, where a first screen section of the plurality of screen sections comprises a first screen mesh size and a second screen section of the plurality of screen sections comprises a second screen mesh size different than the first screen mesh size, the first and second screen mesh sizes each configured to allow one or more cuttings entrained in a drilling fluid used in a drilling or workover operation to pass therethrough;
• a rotation assembly mounted to the screen assembly, the rotation assembly comprising one or more rollers moveable to rotate the screen assembly about an axis of rotation;
• a motor assembly coupled to the screen assembly and configured to vibrate the screen assembly;
• a vibration assembly mounted to the housing and comprising one or more springs configured to oscillate the screen assembly based at least in part on operation of the motor assembly, the vibration assembly mounted to a bottom portion of the rotation assembly, and the rotation assembly is mounted to a bottom portion of the funnel;
• and
• a housing coupled to the screen assembly and the rotation assembly, the housing comprising a cuttings outlet that is fluidly coupled to a cuttings inlet formed in the screen, and a liquid outlet separate from the cuttings outlet that is fluidly coupled to the plurality of screen sections.

A drilling fluid shaker screen system, comprising:

• a screen assembly that comprises a screen mounted to a funnel, the screen comprising a plurality of screen sections, where a first screen section of the plurality of screen sections comprises a first screen mesh size and a second screen section of the plurality of screen sections comprises a second screen mesh size different than the first screen mesh size, the first and second screen mesh sizes each configured to allow one or more cuttings entrained in a drilling fluid used in a drilling or workover operation to pass therethrough;
• a rotation assembly mounted to the screen assembly, the rotation assembly comprising one or more rollers moveable to rotate the screen assembly about an axis of rotation;
• a motor assembly coupled to the screen assembly and configured to vibrate the screen assembly;
• a locking assembly that comprises:
• a first member attached to the screen assembly;
• a second member attached to the rotation assembly;
• a bore formed through each of the first and second members;
• and
• a pin insertable through the bore to fixedly lock the screen assembly to the rotation assembly;
• and
• a housing coupled to the screen assembly and the rotation assembly, the housing comprising a cuttings outlet that is fluidly coupled to a cuttings inlet formed in the screen, and a liquid outlet separate from the cuttings outlet that is fluidly coupled to the plurality of screen sections.