Abstract
Summary
Oilfield-cement compositions capable of self-healing cracks/fractures in set cement without depending on contact with a fluid, such as water or oil, are presented in this laboratory study. Traditionally, such compositions include additives that are capable of swelling when exposed to fluids such as water or oil, for example. Dependence on additives to swell and block flow channels after contact with a specific type of fluid hinders the self-healing effectiveness of the cement composition. As a result, designing cement compositions for field applications requires prior knowledge of the type of fluids that the cement may come into contact with, not only through the productive lifetime but also after abandonment of the well.
Results from testing cement compositions containing a new class of elastomeric additives that do not depend on the nature of the fluid to seal cracks are presented in this paper. The elastomeric materials were chosen such that they have suitable chemical functionalities for binding strongly with cement and metal surfaces, and either have low melting points, as in the case of semicrystalline
polymers, or have low glass transition temperatures (Tg), as in the case of amorphous polymers. Low viscosity or flowability of the elastomers at test temperature and the ability to bind to cement surfaces appear to be two key factors for their effectiveness. The test methods included static thermal healing, measurement of retained mechanical properties after self-healing, and fluid-flowrate measurements through cracked cement samples. The results show that the elastomers are effective in thermal healing of broken cement parts, in partial retention of mechanical properties, and in preventing fluid flow through failed cement samples.
Publisher
Society of Petroleum Engineers (SPE)
Subject
Mechanical Engineering,Energy Engineering and Power Technology
Cited by
19 articles.
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