METHOD TO MONITOR MULTI-FORMATION WELL Russian patent published in 2010 - IPC E21B47/00 E21B43/14 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for multi-formation well monitoring. For this, self-contained instruments are installed on anchors above every formation, for example, prior to swabbing. Swabbing is carried out along with control over fluid parameters, well fluid level depth by its pressure and sequence of commissioning wells. Well fluid level and pressure are recovered along with recording recovery curves. Anchors with self-contained instruments are withdrawn to analyse recorded data. First commissioned formation production rate is determined, while production that of the second and next formations are defined by subtracting known production rate of the first formation from total production rate, then subtracting the next formations. Dynamics of variations in temperature, wellbore pressure, moisture content of fluid above every formation is used to substantiate and confirm dynamics of variations in production rates and to reveal cross flows between beds. Field-geologic measures are undertaken to eliminate said cross flows. Now, anchors with self-contained instruments are again installed above every formation, production pump is downed into the well to start production. Production pump withdrawn for repair, instruments with recorded data are removed to compare their readings with those obtained in swabbing, cross flows are revealed and eliminated.

EFFECT: higher quality and safety, elimination of cross flows during well development.