Title: Recent advances of cementing technologies for ultra-HTHP formations

Authors: Wenjun Cai; Jingen Deng; Ming Luo; Yongcun Feng; Jing Li; Qiang Liu

Addresses: College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China ' Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China ' College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China ' China University of Petroleum (East China), Qingdao 266580, China ' Supervision Center of Tuha Oilfield, Shanshan 838200, China

Abstract: Ultra-high-temperature-high-pressure (ultra-HTHP) formations are usually those formations having a temperature over 200°C and a pore pressure over 140 MPa. With the growing demand for oil and gas resources all over the world, ultra-HTHP formations are more frequently encountered during exploration and development activities. Compared with conventional HTHP wells, it is much more difficult to solve the issues of unstable cement slurry and poor displacement efficiency in the ultra-HTHP wells. Consequently, fluid loss, gas channelling, and other complexities are commonly encountered during cementing in the ultra-HTHP formations. To provide a reference for solving these issues, this work reviews and discusses the advances and applications of a series of cement materials, tools, and technologies developed in the last decade. The work also indicates that these advances cannot overcome all cementing challenges in the ultra-HTHP formations with complex downhole conditions. In short, many achievements have been done in ultra-HTHP cementing technologies, and many improvements remain to be done ahead. [Received: April 26, 2020; Accepted: November 15, 2020]

Keywords: ultra HTHP; cementing; fluid loss; displacement efficiency; complex downhole conditions.

DOI: 10.1504/IJOGCT.2022.119338

International Journal of Oil, Gas and Coal Technology, 2022 Vol.29 No.1, pp.27 - 51

Received: 26 Apr 2020
Accepted: 15 Nov 2020
Published online: 01 Dec 2021 *

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