E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/10 (2006.01) E21B 33/129 (2006.01) E21B 34/10 (2006.01) E21B 43/12 (2006.01)
Patent
CA 2120798
An annular safety system for a well produced by gas lift includes a packer, a landing nipple below the packer and an operating seal unit to which primary and secondary well tubings and a control line are connected. There is an inline valve in the secondary tubing and safety valve operated by the control line in a primary flow conduit in the operating seal unit. After the operating seal unit is inserted through the packer to automatically land and be locked in the landing nipple and the packer operated to anchor and seal in a well casing, flow passages are formed for conveying lift gas from the secondary tubing to around the landing nipple for lifted flow upward through the primary conduit and tubing. When the well is being produced by lift gas, and pressure in the control line is reduced purposely or by rupture of the control line, the safety valve operates to prevent upward lifted flow in the primary tubing. If lift gas pressure in the secondary tubing is reduced purposely or by rupture, the inline valve prevents upward flow. The operating seal unit may be unlocked from the landing nipple for retrieval from the packer and well.
Proctor Lewis Deans
White Pat Murphy
Company Halliburton
Proctor Lewis Deans
Swabey Ogilvy Renault
White Pat Murphy
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