Patent ID: 8820400
Filing Date: 2014-09-02
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; at least two top entry ports in respective circular sockets machined in the annular shoulder, the circular sockets communicating with circular bores that communicate with the central passage; the central passage including a convergence chamber where the central passage and the circular bores converge, a bottom of the convergence chamber being wider than a top of the convergence chamber; an expansion chamber with a downwardly and outwardly inclined sidewall directly below the convergence chamber; and, a mixing chamber directly below the expansion chamber; and a replaceable bottom leg having a bottom end that comprises a flange, the bottom leg being threadedly secured in a bottom leg socket in the frac head body.