Drilling fluid screen and method

A system for filtering a drilling fluid in a tubular string comprising:

• a first tubular member having a box end and a second tubular member having a pin end, wherein said box end is threadedly connected to said pin end, and wherein said threadedly connected box end and pin end form a cavity and wherein said first tubular member and said second tubular member have an internal bore;
• a cylindrical flange member, said cylindrical flange member having a first passage and a second passage, and wherein said cylindrical flange member is fitted into said cavity;
• a cylindrical sleeve having an internal bore, and wherein said internal bore contains a fishing neck, said cylindrical sleeve having a first opened end and a second opened end;
• an attachment member attaching said cylindrical flange member to said first opened end of said cylindrical sleeve;
• a screen member extending from said second opened end of said cylindrical sleeve, said screen member having a plurality of openings;
• a pulling tool for engagement with said fishing neck, said pulling tool having a mandrel with a first end and a second end;
• a plurality of dog members disposed about said mandrel;
• a spring urging said dog members into engagement with the mandrel's first end;
• and wherein said dog members have a shoulder that cooperates and engages with said fishing neck of said cylindrical sleeve.

A method of cleaning a drilling fluid of debris comprising:

• providing a plurality of tubular members, wherein said plurality of tubular members are threadedly connected, and wherein said plurality of tubular members include a first tubular member having a box end and a second tubular member having a pin end, wherein said box end is threadedly connected to said pin end, and wherein said box end and pin end form a cavity;
• placing a screen apparatus within said first tubular member, said screen apparatus comprising:
• a cylindrical flange member, said cylindrical flange member having a first passage and a second passage, and wherein said cylindrical flange member is configured to fit into said cavity;
• a cylindrical sleeve attached to said cylindrical flange having a first shear pin in said first passage and a second shear pin in said second passage, said cylindrical sleeve having an internal bore, and wherein said internal bore contains a fishing neck, and a screen member attached to said cylindrical sleeve;
• seating said cylindrical flange member within said cavity;
• passing the drilling fluid through said internal bore;
• flowing the drilling fluid through said screen member;
• collecting the debris within said screen member.