Abstract: The Bozi block of the Tarim Oilfield is a typical tight sand condensate gas reservoir with serious wax plugging. So it is necessary to study the phase behavior and the wax deposition pattern of well fluids in Bozi gas reservoir, which will provide the phase enveloping diagram of the condensate gas and then help to control the paraffin deposition. In this study, the PVT tester and the self⁃designed microscopic solid deposition tester with visualized windows are used to get the phase enveloping line of the condensate gas of Well Bozi 104. The condensate oil and wax precipitation are analyzed based on the results of software simulation and production data. The results show that in the process of condensate gas changing with temperature and pressure, different phase states are produced, such as gas phase region, gas⁃liquid two phase region, gas⁃solid two phase region and gas⁃liquid⁃solid three phase region. The experimental results are used to correct the software simulation results to obtain different temperature and pressure phase. The state envelope is used to predict the conditions for liquid and wax precipitation when the production wells are in different production stages; the condensate and wax deposition areas of the Bozi 104 wells are located on the ground transmission pipelines, and appropriate anti⁃wax measures should be made

Key words: Condensate Gas, Phase envelope, Wax deposition line, Software simulation

摘要： 塔里木油田博孜区块属于典型致密砂岩凝析气藏，存在较为严重的蜡堵问题。通过对博孜区块井流物进行气藏条件下的相态与析蜡规律的实验研究，获得凝析气相态包络线相图，为凝析气井防蜡工艺提供理论支撑。以博孜104井凝析气为研究对象，采用可视化多功能高温高压流体PVT测试仪和可视化高倍显微固相沉积测定仪对其进行高温高压相态与析蜡规律的实验研究，并结合软件模拟结果和生产数据，对凝析油和析蜡情况进行分析。结果表明，凝析气随温度、压力变化过程中，产生气相区、气⁃液两相区、气⁃固两相区、气⁃液⁃固三相区等不同相态区域；利用实验结果对软件模拟结果进行校正获取了实验温度、压力以外的相态包络线，用于预判生产井处于不同生产阶段时析液与析蜡情况；博孜104井析液与结蜡区域位于地面输送管线，应做好相应的防蜡措施。

关键词: 凝析气, 相态包络线, 析蜡线, 软件模拟