富满油田长封固段低摩阻超低密度水泥浆固井技术

Ultra-Low Density and Low-Friction Cement Slurry Cementing Technologies in Long Sealing Sections of Fuman Oilfield

杨昆鹏 李鹏晓 敖康伟 张天意 夏元博 侯薇

YANG Kunpeng LI Pengxiao AO Kangwei ZHANG Tianyi XIA Yuanbo HOU Wei

天津中油渤星工程科技有限公司, 天津 300451 CNPC钻井工程重点试验室, 天津 300451 油气钻完井技术国家工程研究中心, 天津 300451

CNPC Tianjing Bo-Xing Engineering Science & Technology Co., Ltd., Tianjin, 300451, China CNPC Key Laboratory of Drilling Engineering, Tianjin, 300451, China National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Tianjin, 300451, China

为解决塔里木富满油田二开固井裸眼段长、漏失压力低，1.35 kg/L水泥浆固井一次上返成功率低，且水泥浆流变性和稳定性差、早期强度发展慢等技术难题。依据紧密堆积设计理论，通过研究低密度水泥浆用增强剂、优选耐压减轻材料、优化低黏降滤失剂和高效梳型聚羧酸减阻剂等配套外加剂的加量，研制了密度为1.20 kg/L的低摩阻超低密度水泥浆，该水泥浆沉降稳定性低于0.02 kg/L， K ≤0.5 Pa·s n ， n ≥0.8；24 h底部抗压强度大于7.5 MPa，较传统低密度水泥浆抗压强度提高50%以上，满足长封固段、高温高压、易漏失井固井对水泥浆性能的要求。低摩阻超低密度水泥浆在富满油田应用了3井次，效果良好，平均固井质量合格率88.0%。研究及现场应用表明，低摩阻超低密度水泥浆可以为富满油田安全高效开发提供支持。

This paper aims to solve the technical problems of long open hole section, low leakage pressure, low success rate of one-time return of cement slurry of 1.35 kg/L, poor rheological property and stability of cement slurry, and the slow development of early strength in the second-opening cementing of Fuman Oilfield in the Tarim Basin. The low-friction and ultra-low density cement slurry system of 1.20 kg/L was developed based on the theory of close packing design by studying the reinforcing agent for low-density cement slurry and optimizing the pressure-resistant and light material, the low-viscosity fluid loss agent, and high-efficiency comb-type polycarboxylate drag reducer, etc. The settlement of the system was stable and lower than 0.02 kg/L, K ≤0.5 Pa·s n , n ≥0.8; the 24 h bottom compressive strength was larger than 7.5 MPa, which was more than 50% higher than that of the traditional low-density cement slurry system and met the requirements of performance and mechanical properties for long sealing section, high temperature and high pressure, and easy leakage well. The field application of three wells has achieved good results, with an average pass rate of 88.0%. The research and field application show that the ultra-low density and low-Friction Cement Slurry can provide support for the safe and efficient development of Fuman Oilfield.

中国石油天然气集团有限公司科技项目“复杂超深井固井密封完整性技术研究”（编号：2021DJ4105）资助。

https://doi.org/10.11911/syztjs.2023060