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首页> 美国政府科技报告 >Thermal EOR: a Review of Insulated Tubing and Downhole Steam Generator Materials Evaluations
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Thermal EOR: a Review of Insulated Tubing and Downhole Steam Generator Materials Evaluations

机译：热EOR：绝缘油管和井下蒸汽发生器材料评估的综述

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A downhole steam generator post-field-test materials study program has been completed. For the particular combustor design that was tested, wall temperatures as high as 1500 exp 0 F (816 exp 0 C) were observed. Significant variations with respect to time and position were also observed. The CoCrAlY and FeCrAlY alloys appeared to suffer little chemical attack, but both were damaged by what we conclude to be thermally-induced stresses. This mechanism also appears to be a dominant component in the corrosive attack suffered by 310 SS. It was concluded that very thin combustor walls are required in this design to avoid the potentially damaging ''alternating plasticity'' and ''ratcheting'' regimes of cyclic thermal stress. A study of wellbore heat losses from steam injection wells equipped with insulated tubing and conventional (uninsulated) couplings was completed. This study has confirmed that overall wellbore heat loss is substantially higher than expected for good quality tubing with uninsulated couplings if the well bore is wet - an effect attributed to ''wellbore refluxing.'' The temperature at which wellbore refluxing occurs is the boiling point of the annulus water, and is consequently a controllable function of annulus pressure. Reduction of annulus pressure is one means of decreasing the heat loss associated with the refluxing process. Another method is the use of insulated couplings which provided a sufficient thermal resistance to prevent boiling, and hence refluxing, even when totally immersed. Finally, the observation that steady wellbore refluxing can occur without visible steam venting at the wellhead demonstrates that operators should not assume a dry, nonrefluxing annulus based solely on the observed absence of venting. 9 refs., 7 figs. (ERA citation 10:038750)

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