摘要
水平封固段的固井顶替效果是影响水平井固井质量的关键问题,套管居中度与水泥浆流变性是影响水平段固井顶替效果的重要参数。基于国家超级计算中心天河一号大规模集群计算平台,采用Fluent软件对300 m长水平段偏心环空进行1 000 s的固井顶替数值模拟,研究水泥浆流变性对固井顶替界面的影响规律。研究结果表明:在低居中度(居中度≤50.0%)条件下,水泥浆流性指数n对顶替的影响可以忽略;在中等居中度(50.0%<居中度<85.0%)条件下,提高水泥浆n值可以大幅改善环空宽边隔离液滞留,降低水泥浆n值可以改善环空窄边隔离液滞留,设计时需要综合考虑水泥浆n值;在高居中度(85.0%≤居中度<100%)与理想居中度(居中度100%)条件下,设计水泥浆n值时要避免出现其值过小的情况,从而避免在环空出现水泥浆分层窜流现象。研究结果对固井顶替施工设计具有重要指导作用。
Cementing displacement effect of horizontal cementing section is the key to cementing quality of horizontal wells.And the centralized degree of casing and the rheological property of slurry are important parameters impacting cementing displacement effect of horizontal section.In this paper,the cementing displacement in the eccentric annulus of horizontal section(300m long)was numerically simulated for1000s by using Fluent software on the large-scale cluster computing platform Tianhe-1of National Supercomputing Center,to investigate the influential laws of rheological property of slurry on cementing displacement interface.It is indicated that the effect of slurry flow index(n)on displacement is negligible when the centralized degree is low(≤50.0%).When the centralized degree is moderate(50.0%<centralized degree<85.0%),the retention of spacer fluid at the wide(narrow)side can be improved significantly by increasing(decreasing)slurry n,so it is necessary to take slurry n into consideration comprehensively during the design.In the case of high centralized degree(85.0%≤centralized degree<100%)and ideal centralized degree(100%),it is necessary to prevent slurry n from being too low during the design,so as to avoid slurry from stratified channeling in annulus.The research results can be used as the instruction for the design of cementing displacement operation.
作者
陶谦
周仕明
张晋凯
方春飞
薛亮
陈博
TAO Qian;ZHOU Shiming;ZHANG Jinkai;FANG Chunfei;XUE Liang;CHEN Bo(SINOPEC Research Institute of Petroleum Engineering Technology, Beijing 100101, China;College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China)
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2017年第2期185-191,共7页
Oil Drilling & Production Technology
基金
国家科技重大专项"高压低渗油气藏固井完井技术"(编号:2016ZX05021-005)
国家科技重大专项"彭水地区高效钻井及压裂工程工艺优化技术"(编号:2016ZX05061-002)
关键词
水平井
固井
顶替界面
居中度
水泥浆流变性
数值模拟
天河一号
集群计算平台
horizontal well
cementing
displacement interface
centralized degree
rheological property of slurry
numerical simulation
Tianhe-1
large-scale cluster computing platform
