RESEARCH ARTICLE


Study and Application of Permitted Yield Point Control Boundary of Drilling Fluid



Yao Ru-Gang1, 2, Jiang Guan-Cheng1, 2, Li Wei1, 2, Wang Yu-Zhe1, 2, Zhang Hong-Xia3, Fan Jin1, 2
1 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China;
2 MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
3 Drilling Fluid Branch, PetroChina Great Wall Drilling Company, Panjin 124010, China


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© Ru-Gang et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China. Tel: 010-8973.2239; E-mail: 05250815@163.com


Abstract

To consider the needs for drilling and the principles of carry and suspend formation cuttings, the permitted yield point control boundary model of drilling fluid was derived using solid-liquid dynamics under certain given assumptions. Corresponding calculation software was developed in c#. The results show that: Any one of the drilling fluid density, pump discharge, plastic viscosity and drilling fluid pump cylinder bore increases would result in the permitted yield point control boundary which turned out to be narrow. Drilling fluid pump discharge is the main cause of the decrease in the upper range of the permitted yield point control boundary. While drilling fluid density is the main cause of the decrease in the lower range. Application had shown the practicality and accuracy of this model in Tarim oil field KS8 well.

Keywords: Drilling fluid, model, permitted yield point control boundary.