光纤DTS监测在海上油田热采井中的应用

Application of DTS monitoring technique in the thermal production wells of offshore oilfield

邹剑 万芬 王秋霞 辛野 周法元 刘志龙

ZOU Jian WAN Fen WANG Qiuxia XIN Ye ZHOU Fayuan LIU Zhilong

中海石油(中国)有限公司天津分公司 中海石油能源发展股份有限公司工程技术分公司

CNOOC Tianjin Branch Company, Tianjin 300452, China CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China

为了监测蒸汽吞吐作业中油套环空及水平段注汽管内的蒸汽温度变化，为现场蒸汽施工作业提供井下数据支持，采用分布式光纤温度监测技术DTS，通过将光缆捆绑在隔热油管外和Y管穿越到水平段油管内部的工艺管柱结构，对油套环空和水平段温度进行监测，成功录取了注汽前期、注蒸汽、焖井、放喷4阶段全井段温度数据。测量数据分析结果显示，注汽期间水平段温度最高可达368.22 ℃，根据环空温度的变化趋势，对蒸汽上返开展实时监测并采取措施进行控制，为注汽提供安全性保障。现场试验表明，通过监测注汽过程中的油套环空温度可以对隔热油管的隔热性能进行评价，通过监测焖井、放喷期间水平段的温度变化可以为后续的注汽效果分析及油藏数值模拟提供更为准确的测试数据支持。

It is aimed at monitoring the steam temperature change in the tubing-casing annulus and in the steam injection pipe of horizontal section during cyclic steam stimulation, so as to provide the data support for the field steam operation. The distributed temperature sensing (DTS) technique was adopted, which monitors the temperatures in the tubing-casing casing and the horizontal section based on the technological string structure of binding the optical fiber to the outside of insulated tubing and running the Y pipe into the tubing of horizontal section. Owing to the application of DTS, the temperature data in the full hole in four stages (pre-steam injection, steam injection, soaking and blowout) were obtained successfully. The analysis on the measured shows that the highest temperature in the horizontal section during steam injection is up to 368.22 ℃. The returning of steam is monitored in real time and controlled by taking the corresponding measures according to the change trend of annulus temperature so as to ensure the safety of steam injection. The field tests indicate that the heat insulation performance of the insulated tubing can be evaluated by monitoring the tubing-casing annulus temperature in the process of steam injection, and monitoring the temperature change in the horizontal section in the stages of soaking and blowout can provide the accurate testing data support for the subsequent steam stimulation effect analysis and numerical reservoir simulation.

10.13639/j.odpt.2020.02.020