ABSTRACT:

A novel reciprocating valve equipment used to rapidly transfer downhole information to the surface during drilling process is designed with the purpose of greatly improving the generation rate of the drilling fluid continuous wave signal. The research is primarily focused on the effect of valve ports on the generation frequency and characteristics of drilling fluid continuous wave signal. Valve ports distribution is designed as multi-row along the axis and several along the circumference. Furthermore, a mathematical model is built to calculate the parameters of the valve port distribution. The results show the correlation coefficient between the ideal sinusoidal pressure wave and the pressure wave generated by the designed valve ports (distributing 4 on per row and 3 rows along the axis) is 0.9983, and the generation frequency of the pressure wave is up to 20 bit/s. The research indicates that the reciprocating valve equipment can improve the frequency of the pressure wave signal and has a great advantage of improving drilling efficiency.

1. INTRODUCTION
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