易漏产水层注水泥隔断塞工艺优化与应用  

Optimization and application of cementing plug technology for leaky water-producing layers

作　　者：张君毅 简旭 王栋 付华才 张贵鹏 ZHANG Junyi;JIAN Xu;WANG Dong;FU Huacai;ZHANG Guipeng(Chuandong Drilling Company,CNPC Chuanqing Drilling Engineering Company Limited,Chongqing 401147,China)

机构地区：[1]中国石油集团川庆钻探工程有限公司川东钻探公司,重庆401147

出　　处：《天然气勘探与开发》2025年第2期113-123,共11页Natural Gas Exploration and Development

基　　金：中国石油集团川庆钻探工程有限公司E类科研课题(编号:CQ2023B-Y-15-3)。

摘　　要：为了解决川渝地区易漏产水层注水泥隔断塞作业中经常发生的反复注水泥塞无法成塞或水泥成塞后强度不高、成塞段长难以确定的问题,结合易漏产水层特点,充分考虑注水泥隔断塞相关因素,深入分析注塞前、中、后三个阶段的压力平衡状态,建立了水泥隔断塞注塞计算模型,推导了注水泥浆量、注塞位置等关键参数的计算方法,优化注塞方案设计,并开展了施工应用验证。研究结果表明:①注水泥浆量、注塞位置是注水泥隔断塞工艺方案设计中至关重要的参数,新方法可以计算得到上述两个参数的最佳值;②影响注塞质量和成塞段长的混窜,使水泥塞的上顶面和下底面产生段长损失,预估总损失段长的合理范围为50~100 m;③现场应用于TC4井、LG64井,施工过程顺利,一次性注塞成功,显著提高了易漏产水层注塞一次性成功率,同时可以精准控制注塞后的成塞段长和成塞位置,验证了新计算方法的有效性,实现了对原有工艺技术的优化改进。结论认为,优化后的易漏产水层注水泥隔断塞工艺技术,有助于提高易漏产水层注水泥隔断塞作业效率、减少后续侧钻报废进尺。In the cementing plug operations for leaky water-producing layers in the Sichuan-Chongqing area,there are recurring problems such as the failure to form plugs after repeated cement injection,insufficient strength of the formed plugs,and difficulty in determining the length of plugged section.To solve these problems,the pressure balance states before,during and after plugging were analyzed deeply with full consideration of the factors related to cementing plug,together with the characteristics of the leaky water-producing layers.Then,a computation model for cementing plug was established,and the method for calculating key parameters such as the injection volume of cement slurry and plugging depth was derived.Finally,the scheme of cementing plug was optimized,and verified through field application.The results show that,(i)the injection volume of cement slurry and the plugging depth are the critical parameters in the design of cementing plug technology,and their optimal values can be calculated by the new method;(ii)the mixing and channeling of cement slurry influencing the quality of cementing plug and plugged section length lead to the loss of section length at the top and bottom surfaces of cement plug,with the expected reasonable range of the total loss being 50–100 m;and(iii)the field application in Wells TC4 and LG64 is smooth and achieves successful plugging in one trip,which significantly improves the success rate of one-trip cementing plug in the leaky water-producing layers,while controlling precisely plugged section length and plugging depth,verifying the effectiveness of the new calculation method,and achieving the optimization for the original technologies.It is concluded that the optimized cementing plug technology for leaky water-producing layers is helpful for improving the operation efficiency,and reducing the scrapped footage of subsequent side tracking.

关 键 词：易漏产水层 井漏失返 侧钻 水泥隔断塞 液柱压力 

分 类 号：TE256[石油与天然气工程—油气井工程]