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For a block of oilfield geological conditions(high salt,high pressure sandwich)complex,the inner pressure is too low when no support within the fluid column after unloading by using conventional single-tube gas lift completions with positive lift oil production,and so the pressure between the annulus and external of casing becomes large,the casing may be damaged,a dual tube completion annulus filled with fluid for resisting pressure is used to overcome this problem in the adjacent surrounding blocks by gas lift production string with positive and reverse lift oil,but this technology is complex,poor system reliability,having large construction and maintenance difficulty.From anti-squeeze,tensile strength,internal pressure strength check of the casing string,the production and shut state's safety of the concentric double tube gas lift positive lift completion string preferably determined under the conditions is verified,the results show that the set of gas lift completion string design is feasible,the new completion string not only reduces the implement construction,maintenance difficult of gas lift and also improves system reliability by contrasting completion string in the adjacent blocks.