A Cement Slurry Used at Ultra-high Circulation Temperature of 210℃
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摘要: 随着勘探开发不断向深层迈进,超深井、超高温井逐渐增多,超高温对水泥浆抗温能力提出了更高挑战。为了解决现有水泥浆体系抗高温能力差的问题,研制了抗高温降失水剂DRF-1S、抗高温缓凝剂DRH-2L及其他配套抗高温水泥外加剂,并形成了超高温常规密度固井水泥浆,在室内对该水泥浆的性能进行了评价结果表明,该水泥浆能够满足井底循环温度210℃、井底静止温度230℃的固井要求,水泥浆API失水量可以控制在100 mL以内,稠化时间可调,高温沉降稳定性不大于0.04 g/cm3,230~250℃超高温下水泥石强度高且不衰退。该水泥浆在华北油田杨税务地区高温深井安探4X井φ127 mm尾管固井进行应用,固井质量优质,为该地区勘探开发提供了固井技术支撑。Abstract: To develop deep buried hydrocarbons, more and more ultra-deep and ultra-high temperature wells are drilled, imposing greater challenges to the thermal stability of cement slurry. To improve the high temperature stability of the cement slurries presently in use, a high temperature filter loss reducer DRF-1S, a high temperature retarder DRH-2L and other high temperature cement additives have been developed. A high temperature cement slurry with normal densities was formulated with these additives and was evaluated in laboratory. The laboratory evaluation results show that this cement slurry can be used at bottom hole circulation temperature of 210℃ and static bottom hole temperature of 230℃. The API filter loss of the cement slurry can be controlled to below 100 mL. The thickening time is adjustable. Differential density of the cement slurry at bottom and top is less than 0.04 g/cm3 at elevated temperatures. At ultra-high temperatures of 230℃-250℃, the set cement has a high strength that does not deteriorate with time. This cement slurry has been successfully used in cementing the φ127 mm liner string of the high temperature deep well Antan-4X drilled in the Block Yangshuiwu, Huabei Oilfield, and the excellent job quality of well cementing has provided a technical support for cementing exploratory wells in this area.
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