RESEARCH ARTICLE


Design and Application of Removable Plugging Slurry for Fractured Carbonate Reservoir



Weian Huang1, 2, *, Zaiming Wang3, Zhengsong Qiu1, Zhongzhi Hu3, Hanyi Zhong1, Yunfeng Liu1, Zhaochuan Li1
1 School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
2 School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley 6009, Australia
3 Drilling & Production Research Institute, Petro China Jidong Oilfield Company, Tangshan 063000, China


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© Huang et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; Tel: +86 0532 86981190; Fax: +86 0532 86983030; E-mail: masterhuang1997@163.com


Abstract

To meet the requirements of leakage stopping and reservoir protection at the same time in fractured formation, the removable plugging slurries with high temperature tolerance were designed, evaluated and applied in the field successfully. Analysis shows that the fibre materials can deposit onto crack surface, bridge and seal fractures quickly and the selected particles can bridge in throat near wellbore. The comprehensive grading of filling particles was determined from the point of view of gradient filling. The designed plugging slurries KJD155 and KJD200 with higher total dissolution rates sealed 1 mm, 2 mm, 3 mm, and 4 mm crack blocks effectively at room temperature and high temperature (KJD155 at 155 °C; KJD200 at 200 °C) respectively. Their pressure bearing ability of them was up to 5 MPa under bottom hole conditions, which was beneficial to the next operation. Field application of the designed plugging slurries was carried out successfully and showed that they were removable and did smaller damage to reservoir.

Keywords: Bearing pressure ability, fractured formation, high temperature tolerance, leak stopping, reservoir protection.