Bore hole safety valves
A safety valve and pump apparatus has an electric pump, a safety valve, a packing means, a continuous length of tubing extending from the surface to the location of the safety valve and pump,Safety Valves a control means provided to operate the safety valve and the pump, and a transmission means disposed along the tubing to transmit signals from the control means to the safety valve and the pump. The tubing, the safety valve and the pump are all being concentrically aligned The electric pump is releasably attached to the safety valve by pump connection means, so that the pump may be disconnected from the apparatus above and left in the well,Butterfly Valves and may afterwards be retrieved. Likewise, the safety valve is releasably attached to the packing means by packer connection means. A safety valve and pump apparatus for a well, PLUG VALVESsaid apparatus comprising: an electric pump; a safety valve releasably connected to said pump by a releasable pump connection; a packing connected to said safety valve for sealing against a well casing; a continuous length of tubing extending from the surface to the safety valve and pump; and control means for operating the safety valve and the pump and including transmission means disposed along the tubing for the transmission of control signals to the safety valve and the pump, the tubing, the safety valve and the pump all being concentrically aligned. Preferably the electric pump is releasably attached to the safety valve by pump connection means. Preferably the safety valve is releasably attached to the packing means by packer connection means. Preferably an electrical connection means is provided, and the coiled tubing and the transmission means are remotely releasably attached to the electrical connection means. Preferably a well head electrical supply is provided, and the electrical connection means is remotely releasably attachable to the well head electrical supply. Preferably a safety valve and an electric pump as defined above are provided. Thus by means of the invention any damage to an eternal hydraulic cable is prevented. Also, the safety valve housing is retrievable, which is a significant advantage in the event of failure of the safety valve for any reason. Conventionally, if the safety valve fails, an additional safety valve is fitted inside the existing production tube which puts severe limitations on the dimensions of the subsequent production tube. Alternatively the production tube is removed and the failed safety valve removed by drilling, such a method is expensive and there is a high risk of damage to the casing and other elements of the well. Packing means refers to at least a surface which, in conjunction with a corresponding surface in the well casing, causes the safety valve to be sealed against the well casing.
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