MONITORING METHOD OF MULTI-BED WELL WITH ELIMINATION OF CROSS-FLOWS BETWEEN BEDS Russian patent published in 2009 - IPC E21B47/00 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: invention is used for co-developing of several beds in an oil or gas well operating a multi-bed deposit. Essence of the invention is that above each bed being developed there arranged are independent devices. The production process is imitated in order to decrease level of liquid or pressure in the well. Flow rate and fluid parametres of each bed are measured with independent devices and readings are stored in long-term memory. The independent instruments are lifted and possible cross-flows between beds are defined according to their readings, and the range of bottomhole pressure in which there are no cross-flows between beds is determined. Independent instruments are lowered again and located above each bed being developed. A production pump is lowered to the depth corresponding to the range of bottomhole pressure determined during well development, in which there are no cross-flows between beds. Production pump is brought into operation and production process is performed. During production process there controlled is equality of two flow rates: as per the readings measured with a flow metre and as per the readings measured during the well development with an independent instrument located above the top bed. Equality of three flow rates is controlled during each scheduled lifting of independent instruments together with the production pump on to the well top: as per the readings measured with a flow metre, as per the readings measured during the well development with an independent instrument located above the top bed, and as per the readings measured during production with an independent instrument located above the top bed. Equality of all the three flow rates is controlled within the range of bottomhole pressure in which there are no cross-flows between beds. Equality of fluid parametres is controlled as per the readings measured during the well development with independent instruments located above each bed and as per the readings measured during production with independent instruments located above each bed. Equality of fluid parametres is controlled within the range of pressure in which there are no cross-flows between beds.

EFFECT: eliminating cross-flows between beds, increasing efficiency and stability of production process, decreasing fluid losses and increasing oil or gas outputs.