Swab test for determining relative formation productivity

Details Swab test for determining relative formation productivity Swab test for determining relative formation productivity

E - Fixed Constructions

21

B

E21B 49/08 (2006.01) E21B 43/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2256258

The productivity of a formation is determined by stroking the drill bit up and down (swabbing) in the zone of interest for creating a suction in the wellbore and inducing the flow of hydrocarbons from the formation. The drilling mud 15 is first circulated to deplete hydrocarbon gas from the mud 15, the zone is swabbed, and the mud 15 is again circulated and the quantity of hydrocarbon gas contained therein is measured for comparison against that known for predetermined productivity. Preferably, the swabbing is performed enough times to ensure measurable production regardless of filter cake or invasion.

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