Volume 14.1 (2-1), May 2023, Pages 16-15

Tamila Khankishiyeva1, Rashad Orujov2

1Assistant, "Industrial machinery" Department, Azerbaijan State Oil and Industry University, Candidate of technical sciences, Azerbaijan. Email id: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.
2Static equipment engineer of SOCAR DOWNSTREAM MANAGEMENT LLC, master degree student of Azerbaijan State University of Oil Industry, Azerbaijan. Email: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.


 When drilling wells in a productive formation being penetrated, hydrostatic bottomhole pressure when it rises above the formation pressure may cause absorption of the drilling fluid by the formation, and when the formation pressure rises above the bottomhole pressure created by the mud column, then fluids enter the well and this can create a blowout, i.e. a manifestation; and absorption and manifestation are accidents.

Losses of the solution result in a decrease in hydrostatic pressure on the well wall in the upper part of the well body, cleaning occurs and favorable business is formed, including the violation of the zone around the well body; which lead to the extraction of the drilling tool and its sticking; therefore, in order to eliminate loss, it is necessary to reduce the density of the drilling fluid, if possible, and increase the value of the structural viscosity. Most accidents occur when drilling clayey rocks.

To reduce the adhesion of clay cake on the well wall, special chemicals are added to the solution: CMAD-1, graphite, oil, sulfonol, OП-10, CAM, soapstock tar (ST).

The narrowing of the well body occurs as a result of swelling of the clay layers.

To prevent complications and accidents associated with the drill string, they are systematically pressure tested. Test pressure values for different depths are shown.

To eliminate accidents associated with the drill bit, it cannot be kept at the bottom of the well for a long time.

The article presents the formulas:

- to determine the maximum speed of descent of the drilling tool.

- to determine the density of the solution.

- to determine the minimum stock of drilling fluid

The wellhead is equipped with appropriate preventers [1].

Keywords: ram preventer, complications, accident, catastrophe, mud losses, blowout, development, drilling mud, crust clay, structural viscosity, shear stresses.