Liner Cementing Techniques with Small Annular Space for Complicated Deep Wells in the Sun Basin, North Yellow Sea
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摘要:
北黄海太阳盆地小间隙尾管固井时，砾石层漏失严重，煤层掉块造成环空憋堵，导致顶替效率低，固井质量差。为此，从固井工具和水泥浆着手，优化井眼准备措施，应用封隔式内嵌卡瓦尾管悬挂器增大环空过流面积，采用基体抗侵纤维防漏水泥浆降低漏失风险，研究形成了一套适合北黄海太阳盆地复杂深井的防憋堵、防漏失小间隙尾管固井技术。该固井技术在4 口井进行了现场应用，均取得了良好的应用效果，固井施工未发生憋堵和漏失，固井质量合格。研究结果表明，该技术可以有效解决北黄海太阳盆地尾管固井质量差的问题，有利于该区域油气资源的进一步勘探开发，具有一定的推广应用价值。
Abstract:During the liner cementing with small annular space in the Sun Basin of the North Yellow Sea, lost circulation is severe in gravel layers, and chippings of coal seams cause annular blockage, resulting in low displacement efficiency and poor cementing quality. Considering these problems, this study selected suitable cementing tools and cementing slurry, optimized the wellbore preparation measures, and expanded the annular flow area using the slip-embedded liner hanger with packer. In addition, anti-leakage cement slurry with matrix invasion-resistant fiber was adopted to reduce the risk of lost circulation. In this way, a set of cementing techniques with small annular space were formed for complicated deep wells in the Sun Basin to prevent blockage and lost circulation. These techniques were applied to 4 wells on site, and the results revealed that no blockage and lost circulation occurred during liner cementing. As a result, the cementing quality met standards. Field applications indicated that the developed techniques could effectively solve the problem of poor liner cementing quality in the Sun Basin, suggesting that they could be further promoted and applied. Overall, these techniques are conducive to the further exploration and development of oil and gas resources in this area.
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Keywords:
- liner cementing /
- cement slurry /
- lost circulation /
- liner hanger /
- blockage /
- Sun Basin /
- North Yellow Sea
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表 1 基体抗侵纤维防漏水泥浆的流变性能
Table 1 Rheological properties of anti-leakage cement slurry with matrix invasion-resistant fiber
温度/℃ 塑性黏度/
（mPa·s）动切力/
Pa静切力/
Pa静切力差/
Pa70 150 26.6 7.1/31.2 24.1 90 144 24.3 6.3/29.2 22.9 110 123 21.5 5.5/27.2 21.7 130 120 20.1 5.1/26.5 21.4 
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表 2 基体抗侵纤维防漏水泥浆的堵漏性能
Table 2 Performance of anti-leakage cement slurry with matrix invasion-resistant fiber
缝隙类型 尺寸/mm 堵漏压力/MPa 漏失量/mL 孔缝 0.5 7.0 10 1.0 7.0 11 2.0 7.0 27 3.0 7.0 41 裂缝 0.5 3.5 14 1.0 3.5 19 2.0 3.5 35 3.0 3.5 49
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