Research and Application of a ϕ273.1 mm Infinite Circulation Liner Hanger in Yuanba Gas Field
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摘要: 元坝气田ϕ273.1 mm尾管固井时因裸眼段长、环空间隙小和尾管段长，导致尾管难以下到设计位置、中途开泵受限和替浆计量困难等技术难点。在分析地质状况、井眼条件和工具功能等因素的基础上，采用了具有压力平衡机构、卡瓦内嵌结构的无限极循环尾管悬挂器及配套胶塞系统，并制定了针对性的尾管下入措施。元坝气田7口井应用了无限极循环尾管悬挂器，实现了中途循环解阻，解决尾管难以下到设计位置的问题，尾管到位率100%，胶塞复合信号明显，实现了精准替浆作业，碰压率85%。研究结果表明，元坝气田ϕ273.1 mm尾管固井采用无限极循环尾管悬挂器效果显著，该尾管悬挂器为元坝气田大尺寸、长裸眼段的尾管固井提供了有效的技术手段，具有一定的推广应用价值。Abstract: Technical problems were encountered when cementing ϕ273.1 mm liners in Yuanba Gas Field, such as long open holes and liner sections and small annular gaps, further leading to difficulties in running the liner to the targeted area and measuring slurry displacement, as well as impeding the midway pump start-up. Considering geological conditions, borehole conditions, tool functions, etc., a infinite circulation liner hanger, integrating a pressure balance mechanism and embedded slips, was adopted and combined with a supporting rubber plug system. Moreover, specific measures for running the liner were introduced. Implementing the technique in 7 wells of Yuanba Gas Field eliminated the midway circular resistance and allowed liner running into the targeted area safely with a successful rate of 100%. The compound signal of rubber plugs was evident, and slurry replacement was accurate, with a bump rate of 85%. The results confirmed the remarkable performance of the infinite circulation liner hanger in cementing the ϕ273.1 mm liner in Yuanba Gas Field. This liner hanger is worthy of popularizing, for it has provided an effective way for cementing large liners with long open holes in Yuanba Gas Field.
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Keywords:
- infinite circulation /
- liner hanger /
- long open hole /
- liner cementing /
- Yuanba Gas Field
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图 1 无限极循环尾管悬挂器坐挂机构原理
Figure 1. Principle of the setting mechanism of the infinite circulation liner hanger
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图 2 内嵌尾管悬挂器与常规尾管悬挂器循环泵压对比
Figure 2. Comparison of circulating pump pressure between the embedded hanger and the conventional hanger
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