method and device for sampling and investigation of unverrohrten oil and gasbohrlu00f6chern

摘要

A method of servicing an open-hole well (12) comprising running a well tool (10) into the well (12). The tool (10) comprises a surge chamber (26) and a closure valve (34), having a normally closed position, in communication with the surge chamber (26). The closure valve (34) comprises an opener for opening the closure valve (34) after a predetermined time delay. The tool (10) further comprises a packer (52) having a packer element (54) engagable with an inner surface of the well (10) adjacent to a zone (18) of interest in the well (10). The tool (10) is activated such that the packer element (54) is sealingly engaged with said inner surface of the well (12), and said opener is actuated to open the closure valve (34) after setting ofthe packer (52). Fluid is flowed from the zone (18) into the surge chamber (26). IMAGE