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; - 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; - 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.