Patent ID: 7789133
Filing Date: 2010-09-07
Classification: E21B

Abstract:
1. An erosion resistant frac head, comprising: a frac head body having a top end with an axial port and a central passage that extends though the axial port and the frac head body, an annular shoulder that surrounds the axial port and is downwardly inclined with respect to the axial port; and at least two top entry ports threadedly secured in respective circular sockets machined in the annular shoulder, the circular sockets communicating with circular bores that communicate with the central passage, the respective at least two top entry ports comprising an elongated pin thread that cooperates with respective box threads in the respective circular sockets, and an outer end of the respective elongated pin threads receives a lock nut that is tightened against the annular shoulder to lock the respective top entry ports in the respective circular sockets.