Experimental study on jet pulse assembly design and numerical simulation

Dian Wang,Liang Xue,Zhi-Qiang Yu,He Liu,Hu Han,Xian-Bo Liu

doi:10.1007/s12182-019-00396-y

Dian Wang, Liang Xue + Show 4 more

Open Access

https://doi.org/10.1007/s12182-019-00396-y

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Journal: Petroleum Science	Publication Date: Nov 29, 2019
Citations: 5	License type: open-access

Affiliation: China University of Petroleum, Beijing

Abstract

Jet pulse assembly is one of the main components of jet hydraulic oscillator. The pressure wave characteristics produced by jet pulse assembly have an important influence on the performance of the tool. In this paper, the structure and working principle of jet pulse assembly are studied, the mechanical analysis model of piston rod is established, the dynamic resistance ratio formula of jet pulse assembly is deduced, and the numerical simulation test of 89-mm jet pulse assembly structure parameters is carried out. The results show that the piston rod downward stroke is driven by both the jet element driving force and the throttle plate load driving force, and can stably descend. The driving force of the piston rod upward stroke jet element is opposite to the load acting force of the throttle disc, and the jet driving force needs to be greater than the load resistance of the throttle disc to stably ascend. The dynamic resistance ratio formula is deduced. When the area of the end of the piston rod is reduced, the resistance of the throttle disc is reduced and the jet power is increased, thus solving the problem of insufficient power of the piston rod in the upstroke and ensuring the normal operation of the tool. Ten groups of numerical simulation tests were carried out, and it was found that the pressure amplitude and pressure drop of the tool decreased significantly with the increase of the tool size, and the error between the numerical simulation value and the theoretical calculation value was less than 9%, which verified the correctness of the theory. It is suggested to select tools on site according to the drilling construction situation to ensure the drilling effect.

Highlights

With the gradual deepening of the development of oil fields, the number of complex structural wells such as high-angle wells, horizontal wells and multi-branch horizontal wells is increasing
By calculating the relative error between the numerical simulation value and the formula calculation value, the error is less than 9%, which meets the engineering calculation requirements
In order to solve the problems of small pressure amplitude and weak axial vibration effect of the tool, it is necessary to design a small-sized piston rod Figure 8 shows the variation of tool pressure drop ΔPt with the size of piston rod and throttle plate for different test groups

Summary

Introduction

With the gradual deepening of the development of oil fields, the number of complex structural wells such as high-angle wells, horizontal wells and multi-branch horizontal wells is increasing. The LOT typically uses an eccentric rotating mass driven by mud to create radial vibration between the wellbore and the tool, thereby reducing friction. In practical applications, both of them have effectively improved the drilling friction conditions, but the performance of AOT is significantly better than LOT (Zheng et al 2003). Since the successful development of the tool around 2000, it has been widely used in thousands of wells around the world Both AOT and LOT have slowed down the optimization and further application of these tools, which have complex structures such as deformable or movable parts and subsequent maintenance, technical difficulties associated with corrosion, wear and failure (Panchal et al 2012)

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Conclusion