Patent ID: 6702028
Filing Date: 2004-03-09
Classification: E21B

Abstract:
Apparatus for effective production of oil and gas from an oil- and gas reservoir (1) comprising a borehole casing (10) with a plurality of perforations (2) or inlet-valves (17), positioned sufficiently enough above a gas seal level (11) to enable a gravitational separation process of gas from the reservoir (1) to take place in a ring space (3), and a tubing (6) which end (15) is positioned underneath the gas seal level (11) assuring only liquids being produced through the tube (6) characterized in that said apparatus comprises at least one submersible pump (5) positioned within the tubing (6), preferably the first pump (5) positioned at a height level underneath the gas-seal (11), a height level regulating system that regulates the height of the gas-seal level (11) preventing the gas seal level (11) from going underneath end (15) of tube (6) and in addition also preventing the gas seal level (11) rising so high that it disables an effective gravitational separation to take place, wherein said height level regulating system comprises a height monitoring means that monitors the height of the gas-seal level (11), and further comprising means for regulating the height of gas-seal level (11) by controlling the gas pressure in ring space (3) in combination with controlling one or more other distinct production features, said other distinct production features being selected from the group consisting of (i) adjustment of the power of pump(s) (5), and (ii) adjustment of a valve (12) positioned inside tube (6) slightly above the lowest of the pumps (5), and further whereby the control of the gas pressure in ring space (3) is accomplished by measuring the gas pressure in ring space (3) by a pressure meter (8) and regulating the pressure by a valve (4).