基于快速堵漏阀的多漏层不起钻堵漏技术研究及应用
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中石化西南石油工程有限公司钻井工程研究院

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Research and Application of Multiple Leakage Layers Plugging Without Tripping Out Based on Fast Circulating Valve
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Drilling Engineering Research Institute, Sinopec Xinan Oilfield Service Corporation,

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    摘要:

    川渝地区裂缝、断层、不整合接触的弱面结构及多压力体系等复杂地层因素,导致同一裸眼段多层、多机理漏失频发。为了解决传统更换组合堵漏模式下大粒径堵漏材料泵送通道建立慢,堵漏耗时长,以及现有堵漏工具稳定性差,现场应用受限等难题,以地面投球切换流道,快速建立堵漏通道的工作原理,研制出一种允许大粒径堵漏材料通过的可重复开关快速堵漏阀。通过工具尺寸、滑套结构、球座结构、球篮及工作球组结构特异性优化设计,增强工具结构稳定性同时匹配井漏高风险段井眼尺寸及堵漏材料性能需求,允许通过堵漏材料粒径≤10mm,允许堵漏浆浓度≤40%。基于长裸眼段不同井漏特点,以钻具组合中配置快速堵漏阀为核心,形成了单趟钻分次钻遇不同漏点多次堵漏、多漏点同时漏失分段堵漏方法,可实现不起钻最多5个漏层堵漏。现场试验提高堵漏作业时效74%,降低了堵漏成本。

    Abstract:

    Complex geological factors such as fractures, faults, weak surface structures in unconformity contact, and multiple pressure systems in Sichuan Chongqing region result in multi-layers and multi-mechanisms leakage in same open hole. In order to solve the problems of long plugging time caused by slow establishment of pumping channels for large-diameter plugging materials under traditional mode of replacing drilling tool assemblies for plugging operations and limited on-site application caused by poor stability of existing plugging tools. A repeatable on-off fast circulating valve that allows large-diameter plugging materials to pass through has been developed based on the working principle of quickly establishing a plugging channel by switching flow channels through ground injection of work balls. Through specific optimization designs of tool size, sliding sleeve structure, ball seat structure, basket and working ball group structure, the stability of tool structure is enhanced while matching the wellbore size and performance requirements of high-risk leakage section. It is allowed to use maximum material particle size of 10mm and maximum plugging slurry concentration of 40%. Based on the characteristics of different leakage type in long open hole section, a technical method for rapid plugging with fast circulating valves has been proposed, which involves multiple plugging methods for multi-leakage points encountered in longitudinal drilling and segmented plugging method for multi-leakage points simultaneously. The method can achieve plugging up to 5 leakage layers without tripping out and on-site test improved the efficiency of plugging operations by 74% and reduced the cost of plugging.

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  • 收稿日期:2024-07-11
  • 最后修改日期:2024-11-08
  • 录用日期:2024-11-22
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