基于水合物层骨架重构的低温早强胶凝材料
A Low Temperature Early Strength Gel Material Based on Reconstruction of Hydrate Layer Frame
徐鸿志 1宋伟宸 2步玉环 3向常友 4柳华杰 3路畅5
作者信息
- 1. 中国石油大学(华东),山东青岛 266580;中国石油集团海洋工程有限公司,天津 300451
- 2. 中国石油集团海洋工程有限公司,天津 300451
- 3. 中国石油大学(华东),山东青岛 266580;非常规油气开发教育部重点实验室,山东青岛 266580
- 4. 中国石油大学(华东),山东青岛 266580;中国石油天然气股份有限公司塔里木油田分公司,新疆库尔勒 841003
- 5. 中国石油大学(华东),山东青岛 266580
- 折叠
摘要
针对于天然气水合物能源试采过程中出砂导致试采作业被迫终止的问题,在水合物第 2次试采工作经验和层内加固、防砂理论的基础上,进行了水合物层骨架重构的低温早强胶凝材料体系构建研究.该研究对比了嘉华G级、超细水泥和早强水泥的低温早期强度和长期长度、粒径分布,基于满足层内加固骨架重构孔隙尺寸,进行了低温早强胶凝材料组分设计,以水泥浆流动度、早强性及成本为目标,尽可能提高固结体的早期强度,为后续增渗提供更多强度下降空间.通过研究超细油井水泥与嘉华G级水泥的配比、早强剂优选及加量优化,构建出了低温早强胶凝材料体系,该体系在 15℃水浴下 24h抗压强度可达到 12.86 MPa,具有良好的流动性、稠化时间和失水可控性,相较于文献的低温早强水泥浆体系具有更好的增渗高强特性.该研究为后续研究水合物层内骨架重构高渗透、高强度的工作液体系奠定了材料基础.
Abstract
In the trial production of natural gas hydrate resources,sand production often forces the operation to terminate.A study,aimed at the construction of low temperature early strength gel materials through reconstruction of hydrate layer frames,is conducted based on the experiences gained in the second trail production of hydrate resources and the theory of intralayer reinforcement and sand control.In the study,the low temperature early strength,the long-term length and the particle size distribution of three kinds of cement,which are Jiahua class G,ultra-fine cement and early strength cement,are compared.Based on satisfying the requirements of reconstructing pore sizes through intralayer reinforcement of frames,the components of the low temperature early strength gel materials are designed.The early strength of the solidification body is increased to a degree that is as high as possible taking into account the fluidity of the cement slurry,the early strength and the cost as the main design targets,thereby leaving more space for the strength decline in subsequent permeability improvement.By studying the ratio of the ultra-fine oil well cement to the Jiahua class G cement,optimizing the early strength agents and their concentrations,a low temperature early strength gel system is developed.The low temperature early strength gel system has 24 h compressive strength in 15℃water bath of 12.86 MPa,good fluidity and controllable thickening time and filtration rate.Compared with other low temperature early strength cement slurries introduced in relevant literatures,this cement slurry has better permeability enhancement and high strength characteristics.This study has laid the material foundation for subsequent researches on frame reconstructing high permeability high strength working fluid systems within hydrate layers.
关键词
水合物层/骨架重构/低温早强/胶凝材料Key words
Hydrate layer/Frame reconstruction/Low temperature early strength/Gel material引用本文复制引用
基金项目
中国石油天然气股份有限公司重大科技项目(ZD2019-184)
出版年
2024
国家科技期刊平台
NSTL
万方数据