| According to researching and analyzing failure model of off-center wearing and parting of sucker rod and tubing in the water drive pumping well, I confirm the main factors that cause failure of off-center wearing and parting of sucker rod and tubing in the water drive pumping well, and open out the life distribution of off-center wearing and parting of sucker rod and tubing in the water drive pumping well, then calculate its reliability indexes, so I can quantificationally estimate the use reliability of off-center wearing well. It offers scientific evidences for improving management and operation regulations, arranging reasonably the pump-checking rate, and confirming best technic condition combination. Therefore, it is useful in rising recovery ratio of rude oil and benefit of oil field, and reducing the pump-checking period of water drive pumping well and the cost of usage and servicing, so it has good economy value.During researching the connection of the pump-checking period and its influencing factors, on one hand, adopting regress analysis method I establish its experience formula and draw corresponding curve, and open out the influencing connection to each other; on the other hand, adopting orthogonal test method, I list square difference analysis table, get the influencing degree of the relevant factors to the pump-checking period and confirm best technics condition combination. In addition, through establishing the fault tree of wearing and parting of sucker rod and tubing, I can find all the relevant factors and their combination, calculate structure importance of every factor. We should put emphasis on the basic event that has bigger structure importance, and improving its reliability can improve the whole reliability of water drive pumping well. According to these we can forecast and diagnose off-center well failure in spot, find the weak unit of system, direct servicing, achieve best running of system.
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