Technology Solution for Improvementof the PDC Drill Bits Performance

Abstract

The article is devoted to the problem of bringing the desired load to the drill bit and improving the technical and economic indexes of drilling at drilling the oil and gas wells. The authors propose a bottom-hole assembly (BHA) consisting of PDC bits, downhole oscillator, screw downhole motor, measuring-while drilling system and drill pipes. The results of the proposed assembly pilot tests are presented. The tests were conducted in well No. 6053 in Sheremetyev field, Tatarstan Republic.

Sonic Drilling with a Cavitation Hydraulic Vibrator: Theoretical Computation of the Energy Performance and Rate of Penetration

“…Considering the presented results, it can be argued that for rocks of approximately equal strength, the use of a drill bit with a cavitation hydraulic vibrator is more effective compared to other means of exciting the vibration load of a drill bit. For example, the maximum penetration speed using a hydraulic low-frequency oscillator (up to 100 Hz) was 22 m/h [45], and the high-frequency mechanical vibration impactor at the frequency of 2500 Hz reached the value of 34 m/h [19]. At the same time, the penetration speed with a cavitation hydraulic vibrator at a frequency of approximately 2500 Hz (see Figure 7a at τ = 0.25) is 43 m/h and it is approximately 28% higher than the speed with a mechanical high-frequency vibration hammer.…”