FORMATION CUT-OFF PROCEDURE FOR WORK OVER WITHOUT WELL KILL OPERATION Russian patent published in 2014 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: method includes a separate running in to the well of a pipe string with packer system, sensor units (when required) to control parameters of the well state, a pilot-controlled electrical or electromechanic valve and downhole wet contact unit connected and disconnected electrically and mechanically. The pilot-controlled electrical valve is intended for opening/closure for delivery of the formation fluid to overpacker area of the well. A separate running in is made for the pipe string in the lower part of the downhole wet contact unit connected and disconnected electrically and mechanically by an electrical line ensuring data transfer from monitoring sensors, supply and transfer of commands to the pilot-controlled electrical or electromechanic valve from the ground station or running in is made for the pipe string equipped with a deep well pump, electric submersion pump or a shank of any other type fixed in the lower part of the pump equipment, or a telemetry unit located under the pumping unit, the upper part of the downhole wet contact unit connected and disconnected electrically and mechanically. The electrical line may be connected at the wellhead by a separate cable line when submersible electric drive (sucker rod pump, free-flow production method, etc.) is not used in the downhole equipment or in composition with the fourth core of the submersible cable for electric pumps up to an electric drive of the pump equipment and then by a separate cable or from the zero point of the submersible motor or from telemetric system of the submersible motor. The shank may be equipped with emergency isolation device. Upon matching of the upper and lower part of the downhole wet contact unit connected and disconnected electrically and mechanically the electrical coupling between the ground station for the formation operational parameters and the pilot-controlled valve is set and in result there is a option to control and measure parameters of the well state and to cut off the formation fluid when maintenance and repair operations are performed for the pumping equipment.

EFFECT: option to perform lifting of the pumping equipment for maintenance and repair without well kill operations.

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