Investigation on the influence coupling drilling fluid and formation boundary on acoustic wave propagation in drill string

Springer Science and Business Media LLC - Tập 6 - Trang 1-14 - 2020
Tianshou Ma1, Jiayan Zou1, Ping Chen1, Haosheng Liu2
1State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, People’s Republic of China
2Southwest Drilling Company, Zhongyuan Petroleum Engineering Co., Ltd., SINOPEC, Chengdu, People’s Republic of China

Tóm tắt

Acoustic transmission along the drill string for measurement while drilling (MWD) is an effective solution to the problem of the low transmission rate that results from mud pulse transmission. However, the actual downhole acoustic waves are affected by many factors, such as drilling fluid properties and, formation boundaries, and their effects on acoustic wave transmission in drill string are not thoroughly understood. To solve this problem, a longitudinal vibration model was proposed for acoustic wave propagation in drill string, and the coupling effect of the viscous damping of drilling fluid and the contact between the drill bit and formation was taken into account. The finite difference method with second-order accuracy is used to solve the mathematical model. The results show that an increase in drilling fluid damping causes the amplitude of the acoustic wave to decrease linearly, but the effect is not significant. The formation boundary mainly affects the low-frequency response of the drill string channel, while having little impact on the high-frequency response. Based on the above analysis, this paper proposes adding an acoustic isolator in the bottom-hole-assembly that can be used to mitigate or eliminate the influence of the formation boundary on the acoustic signal in drill string. The numerical results indicate that such an acoustic isolator can effectively attenuate the noise and improve the amplitude-frequency characteristics of a low-frequency signal induced by acoustic transmission along the drill string.

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