Magnesium Peroxide & Calcium Peroxide in Oil Field application
In this field, a polysaccharide polymer is often used to either fracture
the rock or form a filter cake. After
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the polymer achieves its purpose, it must be degraded to lower its
viscosity so that it can be easily removed.Products that are used
in this field to lower the viscosity of these polymers are called
breakers.The challenge in the selection of a breaker is to use a product
that will remain inactive until the polymer performs its function
and then causes a rapid degradation of the polymer. Calcium Peroxide
and Magnesium Peroxide have unique advantages in this field. They
are very slightly soluble in water and have relatively high stability
to decomposition at elevated temperatures. At the desired time, these
products can be activated by the addition of an acid or by other means.
This results in the generation of hydrogen peroxide which is the actual
oxidizing agent.Several patents and new patent applications claim
the use of calcium and magnesium peroxide in this field. The following
examples are selected for illustration only. The reader should review
the literature for a full list of patents to determine whether the
intended application is coveredby a patent in the country of application.
Fracturing fluids
US 5,253,711 claims the addition of calcium or magnesium peroxide
as a component of a fracturing fluid. The products are then activated
by heat. Magnesium peroxide achieves a delayed break at high temperatures
whereas lower temperatures activate calcium peroxide.
US 200,309,251 and US 6,488,091 claim the use of calcium or magnesium
peroxide in fracturing fluids of different compositions and processes.
US 5,624,886 claims the use of alkaline earth metal peroxides for
fracturing of subterranean formation. The products are granulated
into a pellet or prill.
Filter cake removal
US 5,238,065 claims the destruction of filter cakes using solutions
containing calcium or magnesium peroxide together with an acid. The
acid activates the peroxide at the desired time.
US 5,697,905 and US 6,494,263 claim the incorporation of magnesium
peroxide as a breaker in different filter cake compositions. At the
appropriate time, an activator solution is used to release hydrogen
peroxide from magnesium peroxide.
US 6,138,760 claims the incorporation of magnesium peroxide in a preî€treatment
fluid which is introduced prior to the polymer containing fluid. This
enhances degradation of the polymer in the filter cake from the reservoir
side of the filter cake during flow back of the treatment fluid.
WO 03,054,109 claims the encapsulation of an inorganic peroxide in
order to improve its stability while embedded in the filter cake and
reduce premature degradation of the polymer. At the appropriate time,
pH is decreased in order to activate the inorganic peroxide.
Well cementing
US 5,613,558 claims the use of calcium or magnesium peroxide in a well
cementing composition. The composition contains hydraulic cement, and
a cement hydration retarder. The role of the peroxide is to degrade
the retarder over a period of time.
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