Title: True rheological behaviours of spacer fluid with consideration of wall slip effect

Authors: Cheng Cao; Xiaolin Pu; Gui Wang; Zhengguo Zhao

Addresses: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China; Energy Research Center of Lower Saxony, Clausthal University of Technology, Goslar D-38640, Germany ' State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China ' State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China ' Drilling Engineering Technology Research Institute, SINOPEC Zhongyuan Petroleum Engineering Company, Puyang, Henan 457000, China

Abstract: Based on the modified coaxial cylindrical measuring systems, experiments on the rheological behaviours of spacer fluid have been done. Tikhonov regularisation is used to acquire the rheological parameters for its advantage. Then the characteristics of rheology and the wall slip effect of spacer fluid have been analysed in detail. The results show that wall slip effect tends to occur in the flow of spacer fluid and should be removed in the measurement of rheological behaviours. The apparent rheological behaviours can be characterised by Herschel-Bulkley model. However, it is far away from the true rheological behaviours of the spacer fluid, which can be characterised by Bingham model. The slip velocity of spacer fluid increases with the increases of wall shear stress. Besides, the critical wall shear stress of spacer fluid varies from 3.26 Pa to 16.64 Pa, and the wall slip effect of spacer fluid will occur even if in a low shear stress region. [Received: February 23, 2017; Accepted: January 9, 2018]

Keywords: spacer fluid; rheological behaviours; wall slip effect; slip velocity; Tikhonov regularisation.

DOI: 10.1504/IJOGCT.2020.104969

International Journal of Oil, Gas and Coal Technology, 2020 Vol.23 No.1, pp.30 - 43

Received: 23 Feb 2017
Accepted: 09 Jan 2018
Published online: 10 Feb 2020 *

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