«Onshore and offshore oil and gas well construction»

Drilling with a controlled pressure in the "well–reservoir" system during the construction of production wells using the example of the Kharasaveyskoye field

UDC: 622.24
DOI: 10.33285/0130-3872-2023-11(371)-25-29

Authors:

¹ Tyumen Industrial University, Tyumen, Russia

Keywords: well drilling, equivalent circulation density, controlled pressure drilling, depression, rotary wellhead seal, abnormally high reservoir pressure, repression

Annotation:

The main technology used today during drilling works remains drilling with abnormally high formations pressure, including productive ones. This is associated with frequent complications in the form of absorption of drilling fluid and sticking of the drilling tool. The main disadvantages of underbalanced primary and secondary wells completion are the following ones: deterioration of the formation reservoir properties and, as a consequence, a significant reduction of wells potential flow rates; longtime of a well development; low oil and gas recovery coefficient of productive formations; difficulties in identifying and assessing the oil and gas content of formations during exploration drilling. By now, it has been proven that the potential effectiveness of any well completion technology can be maximally realized only if the opening of productive formations is carried out under depression conditions.

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