RESEARCH AND APPLICATION OF THE CLOSED MATCHING EXPLOITATION PIPE STRING IN LOW PRODUCTIVITY WELL

Armed at the lower productivity well that could not produce regularly, the closed pipe string and its matching tools were developed according to the theory of exploitation. The chief problem of it is how to ensure the coordinate and integrate among flowing pressure, pipe string diameter and production on the basis of formation parameter, producing liquid quantity and quality. Field testing proved, the closed pipe string has several function that include increasing differential pressure, flushing and plug removal, formation damage prevention, prevention oil well counter-pour and tubing losing. So it can improve production.