CAJ | 학술논문

分析了常规复合片钻头钻遇弹塑性致密泥岩钻进效率低的主要原因，并在此基础上研制了适用于该种地层的新型尖齿PDC钻头。通过对PDC切削齿几何结构的改进、切削结构和水力结构的优化设计而研制的新型钻头，在现场试验中取得了良好的钻进效果。平均寿命高达300 m，平均钻进时效3～4 m，解决了弹塑性致密泥岩钻进效率低的难题，为类似地层的钻探施工提供了一种高效实用的新产品。
분석료상규복합편찬두찬우탄소성치밀니암찬진효솔저적주요원인，병재차기출상연제료괄용우해충지층적신형첨치PDC찬두。통과대PDC절삭치궤하결구적개진、절삭결구화수력결구적우화설계이연제적신형찬두，재현장시험중취득료량호적찬진효과。평균수명고체300 m，평균찬진시효3～4 m，해결료탄소성치밀니암찬진효솔저적난제，위유사지층적찬탐시공제공료일충고효실용적신산품。
The main reasons of low drilling efficiency in elastic-plastic compact mudstone are analyzed.On this basis, a new type bit with sharp-tooth PDC was developed.The optimal design in geometric structure of PDC, cutting structure and hydraulic structure makes a good performance of the bit.Compared with ordinary PDC bits, it provides longer service life and higher drilling efficiency (average in 300m and 3~4m/h respectively) in elastic-plastic compact mudstone drilling.