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本发明叙述一种利用天然气压力作动力的游梁抽油机。有压力的天然气直接从井口通过两通阀交替地进入气缸的上下端,使活塞产生运劫,这就是动力行程。动力行程除了摆动游梁之外,还用来重新压缩前一次动力行程中用过的天然气,使之足以注进排出管线。两通阀的位置受气动执行机构的控制,而后者靠井口的天然气压力作动力,并且配备一个靠游梁上下摆动触发的、由可调节的限位机构限位的套筒阀。驴头不是用“重锤”就是用固定在游梁上的平衡气缸依赖气压平衡。在本发明的一个方案中,平衡气体的压力储存在空心撬座总成内。
The present invention describes a beam pumping unit powered by natural gas pressure. Pressure of natural gas directly from the wellhead through the two-way valve into the upper and lower cylinder alternately, so that the piston looting, which is the power stroke. In addition to oscillating the beam, the power stroke is also used to regress the natural gas used in the previous power stroke enough to be injected into the discharge line. The location of the two-way valve is controlled by the pneumatic actuator, which is powered by natural gas pressure at the wellhead and is equipped with a sleeve valve that is limited by an adjustable limiter mechanism triggered by the swinging of the beam. Donkey head is not to use “heavy hammer” is to use the balance cylinder fixed on the beam to rely on pressure balance. In one aspect of the invention, the pressure of the balance gas is stored within the hollow prong assembly.