Session 1 - Oral 14
Design of Well Cement Slurry System for Shallow-Hydrate under Deep Water：The Development and Application of New Energy Storage Microspheres
Meihua HUO，Huajie LIU，Hui YIN，Yuhuan BU，Rui MA
Petroleum Engineering, China University of Petroleum (East China), Qingdao
266580, PR China
formations are characterized by low temperature, high pressure and low fracture
pressure, and are often associated with natural gas hydrates. In deep-water
cementing, the stability of natural gas hydrate is destroyed due to heat
release from hydration of cement slurry and temperature rise around well bore.
The decomposition of substances destroys the cementing quality between cement
ring and formation. Therefore, how to reduce the low hydration heat release
without affecting the performance of cement is one of the keys of deep water
The design of low hydration exothermic oil well cement
slurry mainly includes three steps. Firstly, design and develop high strength
hollow microspheres and test their effect on cement slurry performance.
Secondly, apply high strength hollow microspheres to paraffin encapsulation to
form energy storage microspheres. Finally, the influence of energy storage
microspheres (ESM) on the hydration heat release performance of cement was tested,
and the influence of ESM on the strength and other basic properties of cement
(density, settlement stability, rheology, etc.) was evaluated.
The results show
high-strength metakaolin-based hollow microspheres has strong liquid absorption
capacity in cement slurry, its shell has large pores and stable liquid
absorption capacity. Porous hollow ceramic microspheres show excellent
adsorption capacity, which can adsorb additives to the inner hollow of
microspheres. The new microspheres can carry both hydrophobic and hydrophilic
materials. Energy storage microspheres can be prepared by adsorbing paraffin.
Energy storage microspheres can significantly reduce the hydration heat release
of oil well cement, and have no negative impact on the density and settlement
stability of cement. Furthermore, the properties of energy storage microsphere
cement could be improved by optimizing additives.
In this paper, a cementing slurry with good early
strength and low hydration heat dissipation was developed by adding energy
storage microspheres and optimizing additives, which can be used for cementing
gas hydrate reservoirs in deep water.
cement slurry; low hydration exothermic; natural gas hydrate reservoir; Deep
Water; Energy Storage Microsphere.