页岩气井固井水泥浆体系研究进展
2018-07-28赵军
赵军
【摘 要】页岩气开发已成为当前非常规天然气领域的一个研究热点,也是我国实现大规模增产天然气的一个突破口。页岩气储层与常规天然气储层差异大,对钻完井和增产技术要求高。我国页岩气开发起步较晚,目前还处在前期起步阶段。固井水泥浆技术是钻完井技术的一个重要组成部分,是实现有效层间封隔保证页岩气高效开发的重要因素之一。本文对近年来国内外在页岩气固井水泥浆技术上取得的进展进行调研分析,阐述在页岩气井固井过程中采用的新技术,指出下一步页岩气井水泥浆技术发展方向。
【关键词】页岩气;水平井;固井;水泥浆
中图分类号: TE256.7 文献标识码: A 文章编号: 2095-2457(2018)12-0220-003
DOI:10.19694/j.cnki.issn2095-2457.2018.12.103
Research progress on cementing mud system in shale gas Wells
ZHAO Jun
(Oilfield Chemistry Division of China Oilfield Service Co.,LTD.,Yanjiao Hebei 065201,China)
【Abstract】shale gas development has become a research hotspot in the field of unconventional gas at present, and it is also a breakthrough for China to achieve large-scale increase in natural gas production.Shale gas reservoir differs greatly from conventional gas reservoir,which requires high drilling completion and production technology.China's shale gas development started late and is still in its early stage.Cementing mud technology is an important part of drilling completion technology,and it is one of the important factors to realize effective interlayer sealing and ensure the efficient development of shale gas. In this paper,in the shale gas solid slurry technology at home and abroad in recent years,the progress on the research analysis,this paper used in the process of shale gas well cementing of new technology,points out the next step of shale gas well water slurry technology development direction.
【Key words】Shale gas;Horizontal well;The cementing;The slurry
0 引言
天然氣作为一种清洁能源在我国的消费量逐年增加,进口量也快速增加,其中2017年进口量达920亿立方米[1]。页岩气作为一种储量丰富的非常规油气资源,近年来得到快速发展。美国通过页岩气的开发成功的由天然气净进口国转变为出口国。而我国页岩气资源非常丰富,高效的开发利用不但具有良好经济效益还具有极高的战略意义。
页岩气主要分布于致密、低孔、低渗的泥页岩地层中,其主要的储存空间是岩石发育的微孔和裂缝,并且存在方式主要以吸附为主,与常规砂岩储层不同,页岩储层具有脆性强、构造裂缝及微裂缝发育等特点。此外,页岩中富含的黏土成分还会使页岩水敏性、膨胀性强、容易坍塌。而不合适的固井措施会导致井筒层间封隔失效,进而引起气窜。……
