An Improved Integrated Reverse Washing, Measuring and Adjusting Zonal Water Injection Process in the Bohai Oilfield
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摘要:
为解决渤海油田常规分注工艺反洗井难、调配效率及调配合格率低的问题，开展了可反洗测调一体分层注水研究。通过配套测调一体配水器、可反洗井封隔器，优化防砂、注水管柱结构，实现了不动管柱反洗井和测调一体功能，形成了渤海油田可反洗测调一体分层注水工艺。渤海油田10口注入困难的井应用该工艺进行了不动管柱反洗井作业，并进行了30井次的调配作业。现场应用结果表明，反洗井工具性能可靠，开关灵活，洗井效果良好，缓解了注水压力升高现象，降低了酸化频次；测调效率显著提高，平均单井调配周期仅需10 h，相较常规分注工艺调配周期2～3 d大幅降低。可反洗测调一体分层注水工艺的成功应用，验证了该工艺的可行性，为渤海油田分层注水开发提供了新的技术手段。
Abstract:The Bohai Oilfield has experienced challenges with its conventional zonal injection processes. Specifically, there have been difficulties with reverse washing, along with low distributing efficiency and low distributing qualified rate. To improve the situation, a study was carried out on the integrated reverse washing, measuring and adjusting zonal water injection process. By developing the integrated measuring/adjusting water distributor and reverse washing packer, the structures of sand control and water injection strings were optimized, and the integrated reverse washing/measuring/adjusting function with fixed string were achieved, thus forming the integrated reverse washing, measuring and adjusting zonal water injection process in the Bohai Oilfield. This process was applied in 10 wells that had difficulty in water injection. In fact, thirty well times of distribution adjustment were performed in the Bohai Oilfield. Field applications suggested that the performance of reverse washing tool was reliable, the switching was flexible, and the well washing effect was good, which effectively alleviated the increased water injection pressure and reduced the frequency of acidizing. The measuring/adjusting efficiency was significantly improved, and the average single well distribution adjustment cycle was shortened to 10 hours, which was significant shorter than that of the conventional zonal injection processes (2–3 days). The successful applications of the integrated reverse washing, measuring and adjusting zonal water injection process verified the feasibility of this process and provided new technical ideas for the zonal water injection development of Bohai Oilfield and thereby improve the efficiency of acidizing.
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图 1 可反洗测调一体分注工艺原理示意
Figure 1. The principle of integrated reverse washing, measuring and adjusting zonal water injection process
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图 2 可反洗测调一体工艺管柱
Figure 2. The integrated reverse washing, measuring and adjusting pipestring
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图 6 A 井反洗作业前后的注水动态曲线
Figure 6. Water injection dynamic curves before and after reverse washing in Well A
表 1 A井模拟测调结果
Table 1 Simulation deployment results of Well A
防砂层段 层位 配水器编号 配水器测调情况 第6防砂段 L50—L70 配6 将流量由490 m3/d调小到260 m3/d，再调大到480 m3/d，证明配水器测调正常 第5防砂段 L74—L80 配5 将流量由256 m3/d调小到188 m3/d，再调大到260 m3/d，证明配水器测调正常 第4防砂段 L82 配4 将流量由140 m3/d调小到60 m3/d，再调大到145 m3/d，证明配水器测调正常 第3防砂段 L84—L92 配3 转动配水器，调节流量不变，且电流由90 mA增大到118 mA，说明该层在此压力条件下不吸水，建议进行酸化处理 第2防砂段 L94—L96 配2 将流量由79 m3/d调小到45 m3/d，再调大到65 m3/d，证明配水器测调正常 第1防砂段 L100 配1 将流量由44 m3/d调小到15 m3/d，再调大到45 m3/d，证明配水器测调正常 
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