Cementing apparatus for reverse cementing

A method for cementing a wellbore;

• the method comprising:
• placing a cementing apparatus within a downhole portion of a wellbore, the cementing apparatus, including:
• a housing;
• a fixed member coupled with the housing, the fixed member having at least one fixed member fluid opening therein;
• and
• a moving member positioned downhole of the fixed member and movable between a circulating position and a cemented position, the moving member having at least one moving member fluid opening therein, the at least one moving member fluid opening linearly offset from the at least one fixed member fluid opening;
• and
• pumping cement slurry into an annulus surrounding the wellbore casing until the moving member moves from the circulating position to the cemented position with the moving member seated against the fixed member.

A well system, comprising:

• a wellbore located within a subterranean formation;
• and
• a cementing apparatus placed in a downhole portion of the wellbore via a conveyance, the cementing apparatus including:
• a housing;
• a fixed member coupled with the housing, the fixed member having at least one fixed member fluid opening therein;
• and
• a moving member positioned downhole of the fixed member and movable between a circulating position and a cemented position, the moving member having at least one moving member fluid opening therein, the at least one moving member fluid opening linearly offset from the at least one fixed member fluid opening.