«Onshore and offshore oil and gas well construction»

Formation of hydrated inclusion compounds for controlling the state of bonds in cement stone

UDC: 622.245
DOI: 10.33285/0130-3872-2022-4(352)-21-27

Authors:

¹ Scientific Research Institute of Pipeline Transport, Moscow, Russian Federation

Keywords: well construction, well cementing, grout cements, cement stone shrinkage, water of hydration, polymer additives, expansion mechanism, hydrate bonds, inclusion compounds, crown ethers

Annotation:

To ensure the tightness of a well lining, it is necessary to ensure the long-term performance of its design. One of the elements that determine a well lining performance is the stable state of the cement stone in the annular and inter-string spaces of the well. The sustainable state of the cement stone includes maintaining its insulating properties under various thermodynamic conditions and sealing contact with boundary surfaces. A change in the state of water and hydrate bonds in the cement stone, accompanied by their transition to the state of an ionic or molecular substance, leads to a weakening and destruction of the cement stone structure. To avoid it, the water in the cement stone should be in the state of matter of the atomic structure. Judging by the nature of hydrate bonds, occurred in the cement stone volume, it is possible to control their state and properties. This provision is realized by the formation of hydrate inclusion compounds in the cement stone based on water and organic compounds, capable of acting as filler (substrate) in hydrated water. Strengthening bonds non-polarity due to the formation of hydrate inclusion compounds based on a combination of water and hydrocarbon compounds makes it possible to control the polarity of bonds in the compounds that make up the cement stone, and, consequently, to control its strength properties, operational durability, and volumetric deformations. It has been experimentally shown that large-sized ionic compounds are able to saturate hydration water based on Portland cement hydration products and change the strength characteristics of the stone, i.e. change the level of polarity in the hydrate bonds of the cement stone.

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