官深1井超高密度水泥浆固井技术

Cementing with Ultra-High Density Slurry in Well Guanshen-1

为解决异常高压气层和高压盐水层固井的实际困难,采用新型超高密度加重材料、超细加重稳定剂与其他填充剂进行颗粒级配,形成了密度为2.60～2.85kg/L的超高密度水泥浆体系。该体系具有流动性好、强度高、抗高温、防窜能力强、对温度及密度变化自适应、施工安全性高、顶部无超缓凝的优点。针对超高密度水泥浆现场施工工艺,进行了超高密度材料灰样混配方案设计、高密度灰样模拟运输测试等研究,并通过优化施工方案,形成了超高密度水泥浆配套固井工艺技术。该技术在官深1井三开固井中成功应用,入井隔离液平均密度为2.75kg/L,水泥浆平均密度2.78kg/L,创造了国内入井水泥浆密度最高纪录。

For the purpose of cementing in high pressure gas and saltwater layers, the ultra-high densi- ty slurry system was studied. The slurry system with density up to 2.60 - 2.85 g/cm3 has been developed with novel ultra-high density weighting materials, superfine weighted stabilizer and other fillers by grading of grain. It is characterized by good fluidity, high strength, high temperature resistance, and strong anti- channeling, and can realize safe self-adaptive operation as the temperature and density change, without ul tra-retarding at the top. Additionally,further study has been made by designing the mixing program of ul- tra-high density cement samples for field operation, constantly simulating transportation of such samples and optimizing the plan, the cementing technology with ultra-high density slurry has been formed. It has been successfully used in Well Guanshen-1, a key exploratory well of Sinopec, with average density of spacers of 2.75 g/cm3 and average slurry density of 2.78 g/cm3 ,creating a record of the highest density of slurry in China.