Drilling Free Stage Cement Collar

· Drilling Free Stage Cement Collar

1.The circulation ports are mechanically opened by free-fall opening plug.
2.After circulation ports are closed, keep building up pressure will enable the sliding sleeves and other accessories to free fall to bottom, eliminating drill-out.
3.The stage collar is designed with internal closing structure. The closing sleeve is designed with hold down mechanism.
4.Applicable well inclination: ≤25°. Applicable to vertical wells or inclined wells with small inclination angle
5.Close the plug and use POLYPAK seal, it can be more Good sealing effect
6.The closing plug uses a flexible rubber plug. Compared with the conventional closing plug, this kind of closing plug has better passability