天然气工业2017，Vol.37Issue(8)：61-65,5.DOI:10.3787/j.issn.1000-0976.2017.08.007
精细控压压力平衡法固井技术的应用实践
Application precise MPD & pressure balance cementing technology
马勇 1郑有成 1徐冰青 1陈力力 1刘世彬2
作者信息
- 1. 中国石油西南油气田公司工程技术处
- 2. 中国石油川庆钻探工程公司井下作业公司
- 折叠
摘要
Abstract
The precise managed pressure drilling (MPD) technology is mainly used to deal with the difficulties encountered when oil and gas open hole sections with multiple pressure systems and the strata with narrow safety density window are drilled through.If its liner cementing is carried out according to the conventional method,lost circulation is inevitable in the process of cementing while the displacement efficiency of small-clearance liner cementing is satisfied.If the positive and inverse injection technology is adopted,the cementing quality cannot meet the requirements of later well test engineering of ultradeep wells.In this paper,the cementing operation ofφ114.3 mm liner in Well Longgang 70 which was drilled in the Jiange structure of the Sichuan Basin was taken as an example to explore the application of the cementing technology based on the precise MPD and pressure balancing method to the cementing of long open-hole sections (as long as 859 m) with both high and low pressures running through multiple reservoirs.On the one hand,the technical measures were taken specifically to ensure the annulus filling efficiency of slurry and the pressure balance in the whole process of cementing.And on the other hand,the annulus pressure balancc was precisely controlled by virtue of precise MPD devices and by injecting heavy weight drilling fluids through central pipes,and thus the wellbore pressure was kept steady in the whole process of cementing in the strata with narrow safety density window.It is indicated that 3114.3 mm liner cementing in this well is good with qualified pressure tests and no channeling emerges at a funnel during the staged density reduction.It is concluded that this method can enhance the liner cementing quality of complex ultradeep gas wells and improve the wellbore conditions for the later safe well tests of high-pressure gas wells.关键词
超深井/尾管固井/窄安全密度窗口地层/精细控压/压力平衡法/井漏/四川盆地/龙岗70井Key words
Ultradeep well/Liner cementing/Narrow safety density window/Precise MPD/Pressure balancing method/Lost circulation/Sichuan Basin/Well Longgang 70引用本文复制引用
马勇,郑有成,徐冰青,陈力力,刘世彬..精细控压压力平衡法固井技术的应用实践[J].天然气工业,2017,37(8):61-65,5.
