«Onshore and offshore oil and gas well construction»

A methodology for calculating pressure increase in the annulus of a well caused by thermal expansion of the above-packer fluid

UDC: 622.24
DOI: -

Authors:

¹ Gazprom VNIIGAZ, Moscow, Russia
² National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: thermal expansion, annular space, production, drilling, experiment, calculation, methodology

Annotation:

The authors of the article identify well integrity problems associated with pressure increase in the annulus when the above-packer fluid is heated during hydrocarbons production. More than 50 MP a pressure increase due to the fluid thermal expansion is confirmed by theoretical and experimental studies. The necessity of taking into account thermal effects when designing wells construction and reservoirs development is shown. Thermal expansion of liquids should be taken into account not only during production, but also during drilling, when a significant deepening of the well below the shoe with an intermediate casing string causes an increase of pressure due to heating of the solutions located in the closed inter-annular space above the roof of the cement stone. To prevent the loss of tightness due to the liquid thermal expansion, compensating measures should be provided in the regulations for inflow induction.

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