提高水井分注测试成功率配套技术研究与应用

doi:10.13809/j.cnki.cn32-1825/te.2023.06.008

摘要/Abstract

摘要：

为解决苏北复杂断块油田同心分层注水在实际应用中存在测试仪器遇阻、分层注水量调配不到位等问题，创新采用空心杆冲洗清管，研究应用防返吐配水器、化学防砂技术来保持注水管柱清洁；设计聚合物冻胶调剖体系来缓解层间矛盾，避免层间级差影响测调效果。各项配套技术累计应用13井次，矿场试验证明其在避免测试仪器遇阻、降低分层注水量调配难度方面具有良好效果，年度配套措施井测试成功率达100 %，同心分层注水井整体测试成功率由74.4 %提升至84.4 %，做优精细注水工作的同时实现降本增效，具有良好的推广应用前景。

关键词: 同心分层注水, 测试成功率低, 空心杆清洗, 防砂, 防返吐配水器, 聚合物调剖

Abstract:

To address the challenges of test instrument obstruction and the suboptimal deployment of concentric stratified water injection in the Subei complex fracture block oilfields, an innovative approach involving the use of a hollow rod for pipe cleaning was introduced. This method focused on two key areas: the implementation of a flowback preventing water dispenser and the application of chemical sand control technology to maintain the cleanliness of the water injection pipe. In addition, a polymer gel profile control system was designed to mitigate the disparities between layers, aiming to minimize the influence of stratum grade differences on measurement and adjustment processes. This suite of supporting technologies has been applied to testing wells a total of thirteen times. The on-site tests have demonstrated that this approach is effective in preventing the obstruction of testing instruments and in simplifying the deployment process for layered water injection. Notably, the success rate of testing wells for these annual supporting measures reached 100 %, marking a significant achievement. Furthermore, the overall success rate of concentric layered water injection wells increased from 74.4 % to 84.4 %. The implementation of this method offers a dual advantage of reducing costs and enhancing efficiency, particularly in the context of optimizing fine water injection.

Key words: concentric stratified water injection, low testing success rate, hollow rod cleaning, sand control, flowback preventing water dispenser, polymer gel profile control

中图分类号:

TE357

许国晨,刘晓文. 提高水井分注测试成功率配套技术研究与应用[J]. 油气藏评价与开发, 2023, 13(6): 773-780.

Guochen XU,Xiaowen LIU. Research and application of supporting technologies for improving success rate of water injection well testing[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(6): 773-780.

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测井层号	厚度/ m	相对吸水量/ %	各层吸水量/（m³/d）	分层情况	配注量/（m³/d）
11	3.0	72.7	18.18	上层	10
13	1.7	18.2	4.55	中层	10
14	1.7	0	2.27	下层	5
15—16	6.0	9.1	2.27	下层	5

井号	措施前测吸水		最高施工压力/ MPa	防砂剂用量/ m3	措施后测吸水
井号	测试压力/ MPa	视吸水指数 /[L/（MPa·min）]	最高施工压力/ MPa	防砂剂用量/ m3	测试压力/ MPa	视吸水指数/ [L/（MPa·min）]
C4-3	8	28.75	13.0	18.0	8.0	27.38
NH2-19	17	8.00	20.8	10.5	17.5	7.50