| 摘要 |
<p>Air is introduced into the injection water for microbial enhanced oil recovery. The injection water is passed through an ejector where it is entrained and the oxygen subsequently dissolves in the water. In operation, the pump (12) operates at a constant speed, pumping water to the wellhead, via the ejector (13). Air is drawn into the water stream at the ejector (13) and dissolves in the water, by virtue of the high water pressure, between the ejector (13) and the wellhead. The amount of air supplied is adjusted using the control valve (23) and this is controlled in dependence upon the pressure in the air line (21) measured by the pressure gauge (25) and the pressure drop across the ejector (13) measured by the pressure gauges (16, 17). The amount of air drawn into the water is also affected by the proportion of water which passes via the bypass line (14), thus avoiding the ejector (13).</p> |
