1.5 



1.45 



1.4 



1.35 

 I 

 i 

 s 1.3 



t 



J-* 

 c 



e 1.2 



< 



*1.15 

 n 

 ) 

 1.1 



1.05 



1 



0.95 





Drill Body Motion 



<150 lb force) 





1 



BASELINE 



1 











1 . 11 

 1 11 l\ 

 if] j 



1 











1 J 1 1 I 



i j I L 



Mi 



1 









i ! ! ! ! ! ! 



1 1 i 

 i \ i 1 

 j i 1 



1 1 



\vwv 



1 1 \ 



r 



Vn? 



\ J 1 ' 



ni ' > r "y< 

 1 



I j 

 100 psi/ / 



jpsi n 



\j£. 



V // 

 ~\N~i"~ J 



800 



\ V / 



psi 



i_ — A Yi 



t^i - 1 >-,\ fl f 



0.05 



0.1 



0.15 

 Time (sec) 



0.2 



0.25 



0.3 



Figure 7 

 Comparison of drill body displacement for pressures from 800 to 1,500 psi. 



19 



