摘要
为了解决注水泥塞的施工过程中,地面调配水泥浆费时费力、施工难度大及安全风险高的问题,根据射流抽吸原理设计了射流抽吸式水泥浆调配装置。基于离散颗粒法对注入漏斗内干水泥粉的运动规律进行数值模拟研究,优化设计了注入漏斗的半顶角和调制开关塞的安装高度,以达到防堵塞的目的,最后通过现场应用验证了该装置的使用效果。研究结果表明:漏斗流的流动形态是导致注入漏斗口堵塞的主要原因;随着注入漏斗半顶角的增大,干水泥粉停滞区域增大,体积流率减小,优选半顶角为45°;调制开关塞能够实现干水泥粉的流动形态由漏斗流向整体流转变,随着其安装高度的增加,干水泥粉的体积流率逐渐减小,优选安装高度为70 mm。现场应用中,射流抽吸式水泥浆调配装置可节省调配水泥浆用时50%以上,水、灰混合均匀,未出现堵塞现象,极大降低了“插旗杆”等施工事故发生的概率,保证了施工作业安全、高效地进行,应用前景广阔。
To address difficult operation and high safety risk of the time-consuming and labor-intensive cement slurry mixing during pumping the cementing plug,the jet suction type cement slurry mixing device is designed based on the jet suction principle.Based on the discrete particle method,the numerical simulation of the movement of dry cement powder in the injection funnel was carried out to optimize the injection funnel semi-apex angle and the installation height of the modulation switch plug to eliminate plugging.The field applications verified the performance of the device.The study results show that the flow pattern of the injection funnel flow is the main reason for the blockage of the injection funnel port.With the increase of the semi-apex angle of the injection funnel,the stagnant area of the dry cement powder increases,and the volume flow rate decreases.The preferable semi-apex angle is 45°.Modulation switch plug can change the flow pattern of dry cement powder from the funnel flow to the whole flow.With the increase of the installation height,the volume flow rate of the dry cement powder is gradually reduced,and the installation height is preferably 70 mm.The field application shows that the jet suction type cement slurry mixing device can save more than 50%of the cement slurry mixing time.The water and cement powder are evenly mixed without plugging,which greatly reduces the probability of operation accidents like"cementing drill pipe"and ensures safe and efficient operation,presenting a broad application prospect.
作者
王方祥
张曙光
李龙
解同川
刘德正
Wang Fangxiang;Zhang Shuguang;Li Long;Xie Tongchuan;Liu Dezheng(Downhole Technology Service Company,CNPC Bohai Drilling Engineering Company Limited)
出处
《石油机械》
北大核心
2019年第11期19-25,共7页
China Petroleum Machinery
基金
中石油渤海钻探工程有限公司项目“水平井连续油管作业技术研究”(2018ZD21Y-01)
关键词
注水泥塞
射流抽吸原理
水泥浆调配装置
离散颗粒法
防堵塞
cement plug pumping
jet suction principle
cement slurry mixing device
discrete particle method
anti-plugging
