Application of Wellbore Insulated Tubing Technique in Bohai High Waxy Oilfield B
Bohai oilfield B is a high waxy oilfield.Due to lack of consideration of the corresponding wellbore wax prevention measures in the development stage,while the wellbore temperature is lower than the wax precipitation temperature,the wax in crude oil begin to precipitate and adsorb on the inner wall of the production string.As more wax precipitates,the oil pipe gradually becomes blocked,causing the oil well to be unable to produce normally.By comprehensively considering the influence of crude oil wax precipitation point temperature,production string,and environmental temperature,the wellhead temperature after running the insulated tubing is designed to be 40-42℃.On this basis,the related software is applied to calculate the depth of the insulated tubing to be 1 100 m.After running the insulated tubing,the wellhead temperature is 43℃,which solves the problem of wax deposition in the wellbore and ensures the normal production of high wax oil wells throughout the year.
Bohai oilfield Bhigh waxy oilwax precipitation temperatureinsulated tubingwellhead temperature
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