A Storable Liquid Cement Technology

This paper introduces a new cement slurry – a storable liquid cement. This is a cement that can be stably stored in liquid state, and can set and be made hardened when necessary. Using this technology, the cement slurry can be made in advance, thus solving the problem of large density fluctuation of conventional cement slurries, realizing the accurate control of the density of a cement slurry, and satisfying the requirements of cementing a well that is far away and with hard rig-site operation conditions. The composition, properties, technical features and applications of the storable liquid cement are described in detail. The cement has stable properties when in storage, and can be stored for a long time of more than 90 days, for instance. The liquid cement, after being activated, has properties that are quire close to the conventional cement slurries, and can meet the requirements of operation at 40 – 180 ℃. The cement slurry has short transitional time of static gel strengths, low SPN value, and good anti-channeling performance. This cement slurry can be formulated at the operation base and is not necessarily formulated at the rig-site. The properties of the slurry, after well formulated, can be “locked up”, that is, its properties will always be maintained at the levels when the cement slurry was formulated. When the cement slurry is pumped down the hole, it is activated and then becomes hardened.