Research and application of high-temperature resistant production string technology for offshore superheated steam flooding affected wells
After multiple rounds of huff and puff in Bohai A oilfield,it has been converted to steam flooding development.During the development process,the high temperature at the bottom of the affected wells has put forward stricter requirements for wellbore integrity and sand control.To meet the long-term production needs at sea,how to improve the overall high-temperature resistance of the production string,reduce the temperature of the oil casing annulus,and lower the temperature of the produced liquid on the ground are the key points in the research of the offshore superheated steam flooding affected well technology.Taking the affected well B1 in Bohai A oilfield as an example,combined with the practical experi-ence of offshore oilfield production string and the progress of tool testing,proposes the pro-cess idea of"insulated string+annular fluid replenishment",and optimizes the design of pro-duction string scheme.The wellbore temperature was calculated using professional software under the condition of using this string technology.Compared with conventional string tech-nology,this process string improves the overall temperature resistance performance,reduces the temperature of the oil casing annulus,ensuring wellbore safety and laying a solid founda-tion for the safe production and operation of offshore steam flooding affected well strings.
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