E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/1, 255/25
E21B 34/06 (2006.01) E21B 34/10 (2006.01) E21B 43/12 (2006.01) E21B 49/08 (2006.01)
Patent
CA 1330432
Abstract of the Disclosure Means for lifting formation fluid to the surface in a drill stem test. The drill string has first openings allowing entry of formation fluid and upwardly spaced second openings which are normally closed by a sleeve slidably mounted on the drill string. Fluid pressure from within the drill string impinges on a transverse surface of the sleeve and forces it down, allowing treatment fluid to enter the drill string from the annulus between the drill string and the well bore. A jet pump comprised of a flow constriction creating a venturi effect causes treatment fluid to accelerate upwardly in the drill string, the circulation of the treatment fluid drawing the formation fluid to the surface. The second openings covered by the sleeve include the fluid crossover of the jet pump. A standing valve in the drill string between the first and second openings allows down hole shut-in and pressure build-up tests.
577558
Macrae & Co.
Marathon Oil Company
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