Abstract
An instantaneous change of displacement during the cementing pump closing in the process of cementing in formations with a narrow density window may cause flow and pressure fluctuations and affect the wellbore safety and annulus pressure stability. Therefore, it is important to study the wellbore fluid flow characteristics in the process of cementing pump closing. In this paper, the authors have established control equations for the wellbore fluid flow in the process of instantaneous cementing pump closing and have determined the solution method and boundary conditions for the derived equations. The corresponding calculation software has been developed, and the fluid flow characteristics in the process of the cementing pump closing have been analyzed based on the practical calculation. This research may have important practical significance for optimizing the closing operation parameters in the process of cementing.
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