Abstract: A swing chamber pump can be situated within a horizontal wellbore for pumping wellbore fluids to surface using a power gas. The pump has two fluidly independent and separate pump chambers, each having a self-orienting gas valve and a self-orienting fluid outlet. A switch alternately directs the power gas into a chamber for conveying stored fluid therein to a production string, while the other chamber passively fills with wellbore fluids. A latency device converts a continuous motion into a sudden snap actuation of the switch and controls a period of delay between the actuation of the switch.