A method to manipulate a well , comprising: - providing an apparatus in the well below an annular sealing device , the annular sealing device engaging with an inner face of casing or wellbore in the well, and being at least 100m below a surface of the well; and wherein a connection means is provided connecting the apparatus to the annular sealing device, the connection means being above the apparatus and below the annular sealing device; the apparatus comprising: - a container having a volume of at least 1 litre (I); - a port to allow fluid communication between a portion of the container and a surrounding portion of the well; - an electrically powered pump configured to direct fluids to/from the container from/to the surrounding portion of the well; - a battery to supply electrical power to the pump; - a control mechanism to control the pump, and comprising a communication device configured to receive a control signal for operating the pump; - running the apparatus into the well; then, - isolating the port of the apparatus from a surface of the well; - sending a control signal to the communication device at least in part by a wireless control signal transmitted in at least one of the following forms: electromagnetic or acoustic; - operating the pump in response to said control signal and pumping fluid from within the container to the surrounding portion of the well; and wherein at least one pressure sensor is provided in the well below the annular sealing device, the at least one pressure sensor coupled to a wireless transmitter ; and wherein data is transmitted from the transmitter to above the annular sealing device. - providing an apparatus in the well below an annular sealing device , the annular sealing device engaging with an inner face of casing or wellbore in the well, and being at least 100m below a surface of the well; and wherein a connection means is provided connecting the apparatus to the annular sealing device, the connection means being above the apparatus and below the annular sealing device; - a container having a volume of at least 1 litre (I); - a port to allow fluid communication between a portion of the container and a surrounding portion of the well; - an electrically powered pump configured to direct fluids to/from the container from/to the surrounding portion of the well; - a battery to supply electrical power to the pump; - a control mechanism to control the pump, and comprising a communication device configured to receive a control signal for operating the pump; - running the apparatus into the well; then, - isolating the port of the apparatus from a surface of the well; - sending a control signal to the communication device at least in part by a wireless control signal transmitted in at least one of the following forms: electromagnetic or acoustic; - operating the pump in response to said control signal and pumping fluid from within the container to the surrounding portion of the well; and wherein at least one pressure sensor is provided in the well below the annular sealing device, the at least one pressure sensor coupled to a wireless transmitter ; and wherein data is transmitted from the transmitter to above the annular sealing device. <EOS>