第38卷第1期 2017年2月
文章编号：10013873(2017)01-006606
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI: 10.7657/XJPG20170111
Vol.38,No.1 Feb.2017
大涝坝凝析气藏高含蜡凝析油注气石蜡析出分析
孙雷"，罗强"，许深皓”潘毅"，冷捷"，李立健”
（1.西南石油大学石油与天然气工程学院，成都610500；2.中国石化西南油气分公司川中矿区，四川遂宁629000；
3.中国石油华北油田分公司勘探开发研究院，河北任丘062550）
摘要：以塔里木地大涝坝高含蜡凝析气藏地层流体作为研究对象，利用可连接高温高压DBR-PVT测试装置的激光测试仪和在线过滤器，展开凝析油析蜡点和在线析蜡量实验测试，同时注入气进行多次向后接触后析蜡点测试，结合石蜡析出理论计算模型的计算结果进行对比分析。结果表明：以石蜡组分作为可调参数进行析蜡点、析蜡量模拟与实验测试结果能很好的契合，将流体中石蜡组成物质的量分数代入理论模型进行计算，能很好地预测流体多次向后接触前、后的析蜡点和析蜡量；同时，基于此流体体系进行模拟计算，给出了DL4并注入气不同接触次数后流体组成变化和不同温度下析蜡量变化趋势，注入气体主要以抽提作用为主，导致流体重质组分含量增加且析蜡点上升。所得结果可为凝析气藏进行注气前、后析蜡量计算提供依据。
关键调：塔里木盘地；大涝坝凝析气藏；石蜡；析蜡点；析蜡量；多次向后接触
中图分类号：T341
文献标识码：A
Analysis onParaffinDeposition of High-WaxyCondensateOil with Gas Injection in
CondensateGasReservoirsofDalaobaGasField,TarimBasin SUN Lei',LUO Qiang,XU Shenhao',PAN Yi', LENG Jie',LI Lijian
(1.School of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2.Central Sichuan Mining Area, Southwest Oil and Gas Company, Suining, Sichuan 629000, China; 3.Research Institute of Exploration and Development, Huabei Oilfield
Company, PetroChina, Renqiu, Hebei 062550, China)
Abstract: In order to study formation fluids in the high-wax condensate gas reservoirs in Dalaoba gas field, experiments and tests are car ried out for wax appearance temperature(WAT)and on-line wax precipitation amount of condensate oil with a laser test device and in-line filters connected to high-temperature and high-pressure DBR-PVT tester. Meanwhile, gas is injected to test WAT after multiple backward contacts, The paper compares the results with those obtained from the theoretical calculation model for parafin deposition. The analysis shows that if paraffin components are considered as adjustable parameters, the modeling results of WAT and wax precipitation amount could match with the experimental results very well. If the mole fractions of paraffin components are put into the theoretical model, WAT and wax precipitation amount before and after multiple backward contacts could be well predicted. Using this fluid system to perform mod-eling and calculation, the changes of fluid compositions with different contact frequencies and wax precipitation amount at different temper-atures can be obtained after gas injection in Well DL4. The injected gas mainly plays the role of extraction, which will result in the increase of heavy component content in the fluid and the rise of WAT. The results can provide basis for calculation of wax precipitation amount be-fore and after gas injection in condensate gas reservoirs.
Keywords: Tarim basin;Dalaoba condensate gas reservoir;parafin wax appearance temperature; wax precipitation amount; multiple
backward contact
石蜡析出的根本原因，是油田在油气开采过程中，流体体系的温度、压力和组成发生了变化，改变了流体体系原来的热力学平衡条件，导致气、液、固三相相态转换。如果析出的石蜡剪切强度超过作用于其上的剪切应力，则将形成流动障碍，引起堵塞或沉积-"。
大涝坝凝析气藏反凝析液量高，带有油环且重质组分含量高，注人气虽然可以提高凝析油采收率，但也容易导致石蜡的析出，注入气与地层流体多次接触中
收稿日期：2016-07-30
修订日期：2016-10-27
基金项日：中国石油科技重大专项(2011B-1507)
汽化、抽提、蒸发等相间传质作用，与其发生混相；同时，能抽提流体中较重的烃类(C一C)含量更高，抽提的结果使蜡质、沥青质等物质从原油中沉淀出来，从而降低气驱效率，严重影响油井的正常生产-。前人通过建立气-液-固三相热力学相平衡理论模型17-13，利用状态方程描述气、液相态变化和非理想性特征，非理想的固体溶液用正规溶液理论描述，得到油气藏中析蜡点和析蜡量，对油气藏沉积实验和理论做了大
作者简介：孙雷（1954-），男，辽宁辽阳人，教授，油气田开发工程，（Tel)13880551875(E-mail)sunleiswpi@163.com 万方数据