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 and Application of Hydrophobically Association High-temperature Suspension AgentShuang ZOU1,2,3, Jian-Dong Wang 1,2,3, Tian-Yi ZHANG1,2,3,Wei HOU1,2,3, Jian-Yao WANG1,2,3,
Fang-Zhu XI1,2,3, Fu-Quan SUN1,2,3, Lei YANG1,2,3
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
products in China, mainly composed of compound products withlimited temperature resistance. The stability of these products at low
temperature can still be guaranteed; however, at high temperature, due
to the degradation, desorption, shear dilution and other factors ofpolymer additives in the system, as well as the intensification ofBrownian motion, the settlement of solid particles is accelerated andthe stability is deteriorated, and the temperature resistance can only
reach 160 °C. At the same time, the suspension agent products arebasically mixed with a certain amount of metakaolin, resulting inexcessive thickening of cement slurry at low temperature and excessive
dilution at high temperature. Therefore, it is necessary to develop
cement suspension agents with strong temperature resistance and wide
application scope to improve the stability of cement slurry and ensure
the safety and quality of cementing in high-temperature deep wells.

ABSTRACT
In view of the cementing problem that the sedimental stability of
cement slurry is difficult to guarantee under high temperature and ultrahigh temperature conditions, a hydrophobically associating hightemperature suspension agent BCJ-Z was invented by introducing
hydrophobic groups into hydrophilic polymer chains through molecular
structure design. IR analysis showed that the monomers were involvedin the polymerization reaction; TG analysis showed that BCJ-Z had
good heat resistance, and the heat resistance reached 278 °C. The
performance evaluation experiments of cement slurry show that thesuspension agent does not thicken at low temperature, does not dilute athigh temperature, and has good suspension performance. The
maximum use temperature can reach 200 °C. The comprehensive
performance of cement slurry containing the suspension agent is good.
The suspension agent has been used in more than 30 wells of hightemperature complex deep wells in Tarim and Liaohe Oilfields. The
high-temperature sedimental stability of cement slurry is good, and thesite construction is successful. The high-pressure brine in the salt paste
layer is effectively sealed, and the negative pressure channeling test of
the target layer is qualified.

Through molecular structure design, hydrophobic groups wereintroduced into hydrophilic polymer chains to form hydrophobicallyassociating high-temperature suspension agent BCJ-Z. The temperature
resistance of the suspension can reach 200 °C, and it can resist
saturated salt water. The comprehensive performance meets the fieldrequirements, and solves the problem of poor high temperature stabilityof deep and ultra-deep well cementing slurry.

KEY WORDS: Hydrophobic polymerization, suspension agent, hightemperature, cementing

SYNTHESISINTRODUCTION

Design ideas

Cementing suspension agent is a kind of oil well cement additive usedin cement slurry to prevent particle sedimentation and increase systemstability. Free liquid and solid phase settlement caused by unstablecement slurry has a great influence on the cementing quality, which ismore obvious in large slope section and horizontal section cementing.
Free liquid and solid phase settlement can cause excessive permeabilityof cement stone in the upper part of the well section, and even produce
micro clearance, resulting in interlayer connected channeling.

(1) The rigidity of polymer molecular chain is increased and the heat
resistance of polymer is improved by introducing ring monomers,(2) Hydrophobic association polymer is formed by introducing
hydrophobic monomer to improve the suspension performance ofpolymer.
(3) The salt resistance of the polymer is increased by introducing
sulfonated monomers.

MATERIALS AND INSTRUMENTS

At present, the mature cement suspension agents abroad are mainly
synthetic polymer materials with high temperature resistance, such aslatex suspension agents and polymer suspension agents. The
temperature resistance can reach about 180 °C, but the comprehensive
performance needs to be improved. There are few cement suspension

Materials
Acryloyl morph, sodium 2-acrylamidotetradecane sulfonate(NaAMC14S), ammonium persulfate, G class cement, retarder (BCR-637