Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Research on the Synthesis and Performance of Ultra-High Temperature and Large Temperature
Difference Retarder
Ling-Long SHI1,2,3, Tian-Yi ZHANG1,2,3, Kun-Peng YANG1,2,3, Jian-Guo ZENG1,2,3,Bao-Hui ZHAO1,2,3, Jian-Long ZOU1,2,3(1. CNPC Tianjin Bo-Xing Engineering Science&Technology Limited Company, Tianjin, China; 2. CNPC Key Laboratory of Drilling Engineering;
Laboratory of Cementing Technology, Tianjin, China; 3. National Engineering Laboratory of Petroleum Drilling Technology, Tianjin, China)

ABSTRACT

is more prone to super-retarding and cannot afford strength under large
temperature difference. In high-temperature and ultra-high-temperature
cementing, the thickening time and strength development of cement
slurry are key factors related to cementing construction safety andcementing isolation effect. Therefore, it is of great practicalsignificance to develop ultra-high temperature retarders with wide
applicable temperature range and rapid development of top strength
under large temperature difference.

In view of the problems such as the rapid shortening of thickening timeor super-retarding caused by the molecular decomposition of retarders
under ultra-high temperature conditions, and the mutual destructive
performance caused by competitive adsorption similar to the structureof fluid loss additive. The ultra-high temperature and large temperature
difference retarder BCR-500L was synthesized by using vinyl
pyrrolidone with temperature-resistant rigid groups as the main
adsorption monomer and vinyl phosphonic acid as the main retardergroup. After thermos gravimetric analysis, the heat resistance of theretarder was over 300 °C.

DIFFICULTIES IN THE DEVELOPMENT
Functional group

The thickening performance evaluation results show that the retarder
has a wide application range (120~230 °C), the thickening time is easy
to adjust, and the linear regularity is good. The top strength of cementstone of large temperature difference starts within 24 hours.

IA (itaconic acid) is commonly used as the main retarding functionalgroup in polymer retarders, which chelates with calcium ions in cement
slurry to delay the hydration rate. AM (Acrylamide) monomer as
adsorption monomer, in the cement slurry with calcium ion adsorption.
At high temperature and ultra-high temperature, some amide groups
and carboxyl groups are broken, which will lead to abnormal
performance of retarders, and the molecular cracking of retarder maingroup IA will lead to abnormal thickening, such as inversion; thefracture of the adsorption group AM structure will lead to abnormal
adsorption and poor thickening linearity, such as drum up the steps.
The structural diagram of the reaction is shown in Fig. 1.

This retarder also has certain auxiliary fluid loss control performance,
and it still maintains excellent performance after aging. The
comprehensive performance of the ultra-high temperature cement
slurry system meets the technical requirements of ultra-hightemperature cementing, which provides technical support for theexploration and development of oil fields to deep and ultra-deep layers.
Most importantly, this system provides a powerful security assurance
for site construction operations.

KEY WORDS: Ultra-high temperature; Large temperature difference;
Cementing; Retarder
INTRODUCTION
With the development of exploration and development to deep strata,
more and more ultra-deep wells or deep wells with high geothermal
gradient are encountered, and their static temperature reaches above
180~220 °C. Under such high temperature environment, cementing
cement and cement slurry system will have physical and chemical
structure changes. In particular, retarders lead to a sharp shortening of
cement slurry thickening time or super-retarding, while the top cementFig. 1 Structure diagram of polymer retarder binding to calcium ion andhigh temperature decomposition in cement.

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