Big latus rectum bridging plug

The utility model provides a big latus rectum bridging plug, includes sleeve pipe, center tube, overlaps the packing element on the center tube outer wall and arranges the upper and lower cone at the packing element both ends respectively, go up the cone the top and down its cross -section of bottom of cone be the toper, wedge the space between upper and lower slips and the center tube respectively, its characterized in that: the upper portion of center tube inner wall the reducer has, its internal diameter from top to bottom reduces, the cross -section of this reducer is the tapering and is 12-30 the conical surface, this center tube diameter one section less its diameter is not less than 70mm, has the dissoluble ball to arrange this reducer department in. The utility model discloses a distinctive quality lies in: he need not bore to grind, only need to pour into into electrolyte solution alright dissolve the dissoluble ball completely, the big latus rectum of having reserved the bridging plug supplies follow -up plant use.