METHOD OF WELL SURVEYING ON DEPRESSION PRIOR TO BEGINNING OF PRODUCTION, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2010 - IPC E21B47/00 E21B43/14 E21B43/263 

FIELD: oil and gas industry.

SUBSTANCE: prior to the beginning of production there fixed are cumulative perforators (CP) in groups in number equal to the number of PF in the well on cable or on tubing string (TS). Geophysical instruments (GI) are fixed above CP at safe distance. Distances between CP and distances between GI are equal to the distances between productive formations (PF). The device is lowered to the well at the specified depth so that CP can be located in perforation intervals of each PF. Prior to the secondary drilling of PF with perforation the well is filled with liquid to the level providing design maximum depression value for the formation. Secondary drilling of PF is performed with perforation. Immediately after secondary drilling of PF there moved is geophysical cable or tubing string with CP and GI installed on them till the latter are located in perforation intervals of every PF. Investigations of process parametres of operation of each GI PF are performed. After dynamic level is recovered with fluid from formations or after the well is filled with fluid, geophysical cable or tubing string is removed to the surface. GI readings are taken for the purpose of recommendations on production process optimisation.

EFFECT: improving accuracy of results of investigations, reducing the time required for investigations.

2 cl, 1 dwg