天然气工业2023，Vol.43Issue(12)：84-90,7.DOI:10.3787/j.issn.1000-0976.2023.12.009
推力可控的投球式液压随钻扩眼器
A newly-developed ball-activation hydraulic controllable reamer while drilling
摘要
Abstract
As oil and gas exploration and development in China steps into the deep strata,the small annulus clearance in deep and ultra deep wells and the presence of massive salt gypsum cause drilling engineering difficulties such as pipe sticking in plastic strata and narrow safety window of drilling fluid density,which poses severe challenges to casing program,drilling construction and cementing quality.In order to solve these problems,this paper analyzes the structural and functional limitations of domestic reamers,and then develops a ball-activation hydraulic controllable reamer while drilling by means of structural design,safety simulation,flow field analysis,and laboratory experiments.In addition,it is tested on site.And the following research results are obtained.First,the tool can meet the on-site safety requirements,with safety coefficients of 2.42,1.70,and 1.23 under extreme drilling pressure,extreme torque,and extreme pulling conditions,respectively.Second,the tool can control the thrust of the blade by regulating the flow rate of drilling fluid,so as to meet the needs of different reaming holes.Third,the pressure loss changes more significantly at a small flow rate,so the working state of the tool in the downhole can be determined by holding the pressure at a small flow rate after throwing the ball.Fourth,laboratory and field experimental results indicate that the tool can stably perform blade deployment and retraction actions after throwing the ball.The expected reaming hole diameter of the experimental well section is 241.3 mm,and the actual average reaming hole diameter is 241.49 mm,which has an average enlargement of 14.53 mm compared with the hole diameter before reaming,with an expansion rate of 6.4％.Obviously,it is basically consistent with the preset target.In conclusion,the controllable reamer while drilling effectively alleviates the problems of electrical logging resistance and sticking caused by hole shrinkage,and provides a method for solving hole shrinkage in salt gypsum layers and unconventional casing operations.关键词
超压油气藏/盐膏层/井眼缩颈/随钻扩眼器/非常规套管Key words
Overpressure oil and gas reservoirs/Salt gypsum layer/Borehole shrinkage/Reamer while drilling/Unconventional casing引用本文复制引用
李玮,盖京明,李思琪,陈新勇,李钧儒,邹林浩..推力可控的投球式液压随钻扩眼器[J].天然气工业,2023,43(12):84-90,7.基金项目
国家自然科学基金面上项目"万米深井PDC钻头冲击破岩机理及提速方法研究"(编号:52274005). （编号:52274005）
