长庆姬塬油田长效在线增注技术现场应用

Application of Long-term On-line Injection Enhancement Technology in Changqing Jiyuan Oilfield

王尔珍 王 勇 宋昭杰 邓志颖 王伟波

WANG Erzhen WANG Yong SONG Zhaojie DENG Zhiying WANG Weibo

针对姬塬油田物性差、注水压力高、多次欠注井逐年增多，且治理困难的问题，结合长庆油田“小水量、树枝状”的流程特点，分析主力区块特性，提出以“增压注水，药剂控压”为技术思路的长效在线增注技术。在井场安装注水量100~300 m3/d不同型号的增压装置，同时在满足注水需求的前提下配套加注综合降压增注药剂，建立主力区块的压力预测图版，并在姬塬油田进行了现场应用。结果表明，增压装置满足了现场局部在线提压增注要求；以剥离分散剂、螯合剂、润湿剂、清洗、酸化缓蚀剂和甲醇为主剂的注水井用综合降压增注剂COA-2具有防膨、阻垢、降低油水界面张力的优点，控压增注效果较好；主力区块的压力预测图版为有效控制压力上升幅度提供了依据。在采油厂累计实施48个井组，改善了105口多轮次增注措施无效井欠注问题，平均有效期为266d，平均单井日增注11 m3，累计增注达54.95×104m3，对应826口油井中234口油井见效，平均单井组日增油2.25 t，累计增油1.95×104t，达到了多轮次增注措施无效井长期稳定注水的目的。图5表2参13

Aiming at the problems of poor physical properties，high water injection pressure，increasing number of under-injected wells year by year and difficult treatment in Jiyuan oilfield，combining with the flow characteristics of small water volume and branched form in Changqing oilfield，a long-term on-line injection enhancement technology based on boosting water injection and medicament pressure control was proposed after analyzing characteristics of main blocks. Different types of booster devices with water injection capacity of 100—300 m3/d were installed in the well site，and comprehensive depressurization and injection agents were added to meet the demand of water injection. The pressure prediction chart of main blocks was established and applied in Jiyuan oilfield. The results showed that the booster met the local on-line boosting and injection requirements. The comprehensive agent COA-2 for water injection wells with stripping dispersant，chelating agent，wetting agent，cleaning agent，acidizing corrosion inhibitor and methanol as the main agents，had the advantages of anti-swelling，scale inhibition and reducing oil-water interfacial tension，and good effect of pressure control and injection boosting. The pressure prediction chart of the main block provided a basis for effectively controlling the rise of pressure. A total of 48 well groups were implemented in the oil production plant，which improved the under-injection problem of 105 wells with ineffective multi-round injection stimulation. The average validity period was 266 days，the average single well daily injection increased by 11 m3，and the cumulative injection amount increased by 54.95×104 m3. In the corresponding 826 oil wells，234 oil wells were effective with 2.25 t daily oil increase for average single well group，and 1.95 × 104 t cumulative oil increase，which reached the purpose of long-term stable water injection for multi-rounds ineffective injection wells.

10.19346/j.cnki.1000-4092.2019.02.014