深水深井高温高压水泥石固化养护及制备方法研究

Research on solidification conservation and preparation method of high-temperature and high-pressure set cement for deep wells in deep water

刘书杰 武治强 吴怡 侯铎 张智

LIU Shujie WU Zhiqiang WU Yi HOU Duo ZHANG Zhi

中海油研究总院有限责任公司 西南石油大学

CNOOC Research Institute Co., Ltd., Beijing 100028, China Southwest Petroleum University, Chengdu 610500, Sichuan, China

深水深井面临超深、超高温超高压、复杂储层等特殊地质条件，对固井水泥石的综合力学性能提出了更高要求，急需适用于高温高压工况的水泥石固化养护及制备方法，从而准确可靠地评价和优化水泥浆体系。设计并建立了高温高压水泥浆固化养护装置及水泥石制备方法，精准模拟了深水深井高温高压(150 MPa、250 ℃)工况水泥浆固化养护过程，分析对比了不同温度、压力条件下所制备水泥石的单轴抗压强度、抗拉强度等力学性能。结果表明：所建立的高温高压工况水泥石固化养护及制备方法可准确模拟深水深井高温高压井筒工况条件，同时高温高压条件亦可充分发挥水泥浆体系助剂的性能优势，测试发现运用该方法制备的水泥石与常规方法制备的水泥石在抗压强度、抗拉强度等力学性能方面存在显著差异。该方法的提出有利于促进深水深井高温高压水泥浆体系固化养护和水泥石制备技术的发展，为固井水泥浆体系配方优化提供实验方法和技术支撑。

Deep wells in deep water are facing with special geological conditions such as super depth, ultra-high temperature, ultra-high pressure, and complex reservoirs, which put forward higher requirements for the comprehensive mechanical properties of cementing cement. Thus, there is an urgent need for solidification conservation and preparation methods of set cement under high-temperature and high-pressure working conditions, so as to evaluate and optimize the cement slurry system accurately and reliably. A solidification conservation device for high-temperature and high-pressure cement slurry and a method for preparing set cement were established to simulate the cement slurry solidification conservation process under high temperature and high pressure (150 MPa, 250 ℃) in deep wells in deep water. Besides. The mechanical properties such as uniaxial compressive strength and tensile strength of set cement prepared under different temperature and pressure conditions were analyzed and compared. The results show that the established cement solidification conservation and preparation method under high-temperature and high-pressure conditions can accurately simulate the high-temperature and high-pressure wellbore conditions of deep wells in deep water, and at the same time, the high-temperature and high-pressure conditions can also give full play to the performance advantages of the additives in cement slurry system. The set cement prepared by this method shows significant advantages in mechanical properties such as compressive strength and tensile strength compared with the set cement prepared by conventional methods. The proposal of this method is conducive to promoting the development of solidification conservation of high-temperature and high-pressure cement slurry system in deep wells in deep water, as well as the development of set cement preparation technology, which provides an experimental method and technical support for the optimization of cement slurry system formulations.

10.13639/j.odpt.2022.03.004