| 摘要 |
<p>A wellhead assembly is used to cooperate with a polished rod to pump oil. The polished rod crosses through the wellhead assembly. The wellhead assembly includes a clip(1) provided with a cavity; a ring-shaped seat(17) located above the cavity of the clip(1); a eccentricity adjusting ball(2) provided with a vertical through hole, the eccentricity adjusting ball(2) is at least partially rotatably setted in the ring-shaped seat(17); a seal ring(18) provided with an arcual inner wall mounted on the outer wall of the eccentricity adjusting ball(2), and the inner diameter of the seal ring(18) is less than the maximal outer diameter of the eccentricity adjusting ball(2); a tightening cap(3) of the eccentricity adjusting ball, the lower end of the cap body is connected to the outer wall of the clip(1) by thread, the upper surface of the cap body is a cirque, and the space receiving the eccentricity adjusting ball(2) is formed between the tightening cap(3) of the eccentricity adjusting ball and the ring-shaped seat(17) in the clip(1). The polished rod crosses through the clip(1), the ring-shaped seat(17), the eccentricity adjusting ball(2), the seal ring(18) and the cirque on the upper surface of the tightening cap(3) of the eccentricity adjusting ball in turn. The assembly can prevent eccentric wear on the wellhead and is convenient to replace packings.</p> |
