Development and Application of a Leakproof Stage Cementing Collar with Packer in the Shunbei Oil & Gas Field
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摘要:
顺北油气田二叠系固井极易发生漏失，环空水泥缺失长度超过2 000 m，导致生产期间套损严重。针对该问题，研制了封隔式分级箍，并进行了室内性能评价试验和现场应用。室内性能评价试验发现，该分级箍不仅具有常规分级箍的功能，还可以在一级固井后胀封封隔器，封隔漏层，防止二级固井时发生漏失，提高环空水泥环完整性；封隔器胀封后，环空封隔能力可达20 MPa；循环孔关闭后，管内密封能力不低于套管抗内压强度。顺北油气田9口井应用了封隔式分级箍，二级固井平均漏失量由105.1 m3降至3.5 m3，环空水泥缺失长度由2 048 m缩短至350 m，节约固井成本约1 100万元。封隔式分级箍解决了长裸眼易漏失井段固井时的漏失问题，为顺北油气田的高效开发提供了技术支撑。
Abstract:Permian cementing was leakprone in the Shunbei Oil & Gas Field, and the loss of annular cement surpassed 2 000 m, which led to severe casing damage in the production period. To solve this problem, a stage cementing collar with packer was developed, performance evaluated in the laboratory, and applied in fields. The tool works well not only with the conventional function of the stage cementing collar, it can also expand the packer upon the first-stage cementing to seal the layers and prevent the leakage of the second-stage cementing and thus improve the integrity of annular cement sheaths. After the expansion, the annular sealing capacity of the tool could reach 20 MPa, and when the circulation holes were closed, the internal sealing capacity should not be lower than the internal pressure strength of the casing. The developed tool was applied in nine wells of the Shunbei Oil & Gas Field. The results revealed that the average leakage of the second-stage cementing was reduced from 105.1 m3 to 3.5 m3, and the missing length of annular cement declined from 2 048 m to 350 m, saving about 11.0 million yuan in cementing. The stage cementing collar with packer could solve the leakage problem in the cementing of the leakprone well sections which tend to leak in long open holes. The lessons learned in this study provide technical support for the efficient development of the Shunbei Oil & Gas Field.
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图 2 封隔式分级箍结构
1.关闭塞座；2.分级箍本体；3.关闭套；4.循环孔；5.打开塞座；6.注液通道；7.开启阀；8.单向阀；9.关闭阀；10.基管；11.胶筒；12.封隔器单元；13.连接阀单元；14.分级箍单元
Figure 2. Stage cementing collar with packer
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图 6 分级箍循环孔打开压力试验结果
Figure 6. Opening pressure test results of circulation holes of stage cementing collar
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图 7 分级箍管内密封压力试验结果
Figure 7. Internal sealing pressure test results of stage cementing collar
表 1 不同规格封隔式分级箍主要性能参数
Table 1 Main performance parameters for stage cementing collar with packer of different specifications
套管直径/
mm整机密封
能力/MPa封隔器注液
打开压力/MPa封隔器注液
关闭压力/MPa循环孔打开
压力/MPa循环孔关闭
压力/MPa环空封隔
能力/MPa管内密封
能力/MPa胶筒长度/
mm本体最大
外径/mm本体内径/
mm177.8 35 7.0±0.5 13.0±0.5 15.0±0.5 5.0±0.5 20 80 1200 210 156 193.7 35 7.0±0.5 13.0±0.5 15.0±0.5 5.0±0.5 20 75 1200 230 168 244.5 35 7.0±0.5 11.0±0.5 14.0±0.5 5.0±0.5 35 65 1200 290 220 273.1 35 7.0±0.5 11.0±0.5 14.0±0.5 5.0±0.5 35 50 1200 312 244 
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表 2 封隔式分级箍在顺北油气田的应用情况统计
Table 2 Application of stage cementing collar with packer in the Shunbei Oil & Gas Field
年份 井号 二叠系井段/m 套管直径/mm 封隔式分级箍位置/m 一级固井漏失量/m3 二级固井漏失量/m3 水泥环缺失长度/m 2021 SHBX-2YH 3 702～4 261 273.1 3 644.90 366.5 0 265 2021 顺北Z4X 3 886～4 384 193.7 3 651.40 0 0 710 2021 SHBX-8H 4 370～5 034 273.1 4 356.10 474.0 0 305 2021 顺北EY2X 3 458～4 030 193.7 3 400.00 374.5 23.3 700 2022 SHBF-O9H 4 592～5 154 244.5 3 685.70 280.0 0 390 2022 SHBZ-O2H 3 644～4 162 273.1 3 381.20 437.9 0 370 2022 SHBE-X3H 3 415～3 983 273.1 3 008.70 399.2 0 100 2022 顺北E10X 3 264～3 812 273.1 3 013.30 395.0 0 0 2022 顺北T1X 4 104～4 711 273.1 4 078.80 265.1 6.9 140
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