Improvement and Application of the Key Technology of Separate Injection in Bohai Oilfield

doi:10.3969/j.issn.1006-396X.2021.04.015

Abstract

Abstract:

Some strategies for improvement of the key technology of testing?adjusting integrated separate injection technology have been investigated, due to much lower efficiency of conventional testing?adjusting integrated separate injection technology, which cannot accomplish layered static pressure testing. Through optimizing the string structure to improve the pressure balance during water injection, the creep of the string caused by the large displacement water injection is reduced. Design of the bridge channel of the water distributor greatly increases the flow area,reduces the interlayer interference, and further improves the testing?adjusting efficiency. Meanwhile, the pressure hole is added in the water distributor body to establish stratum?tubing pressure transfer channel, and the static pressure testing instrument is equipped for further testing of the layered static pressure. The improved technology works well in application, the deployment efficiency has been significantly improved, which takes only 5 hours to complete the deployment of 6 layers. The overpressure layer can be successfully picked out during the layered static pressure test, which provides a basis for the layered injection allocation adjustment. The adaptability of the improved technology in Bohai oilfield is significantly enhanced.

Key words: Bohai oilfield, Integration of testing and adjusting, Pressure balance, Static pressure test, Bridge channel

摘要：

针对渤海油田常规测调一体分层注水工艺测调效率偏低、无法实现分层静压测试等问题，开展了测调一体分注工艺关键技术改进。通过合理优化管柱结构，实现注水压力平衡，减小大排量注水造成的管柱蠕动；配水器采用桥式通道设计，大幅度增加过流面积，降低层间干扰，进一步提高测调效率；同时在配水器本体增设传压孔，建立地层-油管传压通道，并配套静压测试仪，实现了分层静压测试功能。改进工艺在现场应用中取得良好效果，调配效率明显提高，平均单井调配仅耗时6 h；分层静压测试功能可靠，能够准确判断超压层，为分层配注调整提供了依据。改进工艺在渤海油田的适应性显著增强。

关键词: 渤海油田, 测调一体, 压力平衡, 静压测试, 桥式通道

CLC Number:

TE935

Shukun Yang, Yue Li, Xiang Li, Hongfeng Guo, Gongming Ji, Jingyan Shi. Improvement and Application of the Key Technology of Separate Injection in Bohai Oilfield[J]. Journal of Petrochemical Universities, 2021, 34(4): 91-96.

杨树坤, 李越, 李翔, 郭宏峰, 季公明, 史景岩. 渤海油田测调一体分注关键技术改进及应用[J]. 石油化工高等学校学报, 2021, 34(4): 91-96.

Figures/Tables 7

Fig.1 Water injection string structure of testing and adjusting integrated layer in Bohai oilfield

Fig.2 Structure of water distributor integrated with measurement and regulation

Fig.3 Balanced pressure string

Fig.4 Bridge structure of water distributor

Fig.5 Structure of measurable static water distributor

Fig.6 Measurable static pressure regulator

Table 1 Tiered provisioning results and stratified static pressure test

层段	配注量/（m³ $⋅$ d^-1）	实际注水量/（m³ $⋅$ d^-1）	调配误差/％	井段/m	测试压力/MPa
总计	945	959	1.5
1^#	120	125	4.2	1 253~1 264	15.5
2^#	90	86	4.4	1 276~1 295	17.6
3^#	360	378	5.0	1 306~1 326	15.9
4^#	150	142	5.3	1 340~1 356	18.2
5^#	80	75	6.2	1 367~1 388	16.4
6^#	145	153	5.5	1 395~1 426	16.8

Table 1 Tiered provisioning results and stratified static pressure test

层段	配注量/（m³ $⋅$ d^-1）	实际注水量/（m³ $⋅$ d^-1）	调配误差/％	井段/m	测试压力/MPa
总计	945	959	1.5
1^#	120	125	4.2	1 253~1 264	15.5
2^#	90	86	4.4	1 276~1 295	17.6
3^#	360	378	5.0	1 306~1 326	15.9
4^#	150	142	5.3	1 340~1 356	18.2
5^#	80	75	6.2	1 367~1 388	16.4
6^#	145	153	5.5	1 395~1 426	16.8

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