METHOD FOR DETERMINATION OF STRATUM PRODUCTIVITY IN PROCESS OF WELL DRILLING Russian patent published in 2013 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of a well accompanied by mud logging. At that in drilling process total content of hydrocarbon gas and luminescent properties of capillary extraction are determined. Moreover if total content of hydrocarbon gas is 2% and more and luminescent properties of capillary extraction are equal to 2 points and more the penetrated stratum is subject to further surveys. Packed-hole assembly is pulled out from the well, flow string with packer is lowered and the packer is located over the penetrated stratum; circulation of flush liquid is arranged, tubular annulus is filled with a tracing fluid, the packer is inserted into the borehole over the penetrated stratum. The flow string is swabbed with the rate of 10-17 m/min till intake of reservoir fluid is obtained. In swabbing process samples of liquid are taken to check oil presence. When oil is received from the stratum its daily production rate is determined by build-up method from the maximum reduction value for the level, but not less than 3 MPa of bottomhole pressure. Conclusion on productivity of the penetrated stratum is made provided that oil flow rate is 2 m³/day and more. Drilling of the well is continued.

EFFECT: increase of reliability and operational efficiency, determination of productivity in the process of well drilling.