CAJ | 학술논문

南堡32－3646井是一口四开三段制定向井，设计井深5798 m。3864～4265 m（井斜29.18°的稳斜段）试验了五刀翼旋流喷嘴PDC钻头（主切削齿直径16 mm，3个饱11 mm常规水眼和4个饱18 mm旋流喷射水眼）。针对深井超深井钻进中常采用的相对较高的钻井液密度和粘度，不利于提高钻头破岩效率的问题，在系统介绍旋转射流发生机理和破岩机理的基础上，对NP32－3646井五刀翼旋流喷嘴PDC钻头现场应用情况进行了分析。试验结果表明，旋转射流因具有切向、轴向和径向三维速度，可在高粘钻井液条件下更好地改善井底清岩效果，并通过剪切、冲蚀、拉伸和磨削等多种方式实现辅助破岩，从而提高钻井效率。试验钻头进尺401 m，平均机械钻速4.45 m／h，可较好地满足现场钻进需要，具有良好的推广应用前景。
남보32－3646정시일구사개삼단제정향정，설계정심5798 m。3864～4265 m（정사29.18°적은사단）시험료오도익선류분취PDC찬두（주절삭치직경16 mm，3개포11 mm상규수안화4개포18 mm선류분사수안）。침대심정초심정찬진중상채용적상대교고적찬정액밀도화점도，불리우제고찬두파암효솔적문제，재계통개소선전사류발생궤리화파암궤리적기출상，대NP32－3646정오도익선류분취PDC찬두현장응용정황진행료분석。시험결과표명，선전사류인구유절향、축향화경향삼유속도，가재고점찬정액조건하경호지개선정저청암효과，병통과전절、충식、랍신화마삭등다충방식실현보조파암，종이제고찬정효솔。시험찬두진척401 m，평균궤계찬속4.45 m／h，가교호지만족현장찬진수요，구유량호적추엄응용전경。
NP32-3646 is a three-interval and four-spud directional well with designed depth of 5798m.The swirl nozzle PDC bit was tested in the section of 3864m to 4265m (well deviation angle of 29.18 ), which had 5 drag blades with diameter of 16mm for its main cutters and 7 nozzles (3 ordinary ones and 4 swirl ones with 11mm and 18mm in diameter respectively). In deep and extra-deep well drilling, higher mud density and viscosity are usually employed, which is against to improve bit drilling efficiency.To address this issue, based on the produce mechanism and rock-breaking mechanism of swirling jet flow, the analysis is made on the field application of swirl nozzle PDC bit with 5 drag blades in well NP32-3646.The field application indicates that duo to its three-dimensional velocity of tangential, axial and radial, swirling jet flow can improve the cuttings removal performance at well bottom and rock-breaking can be realized by shear, erosion, stretching and grind-ing so as to improve drilling efficiency.The swirl nozzle bit obtained a total footage of 401m with average rate of penetration of 4.45m/h, which can meet the needs of field drilling and has good popularization and application prospect.