Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Flexibilizing Hydraulic Limits for offshore inclined Wells
Submission Author:
Andre Leibsohn Martins , RJ
Co-Authors:
Andre Leibsohn Martins, Umberto Sansoni Junior, alex waldmann
Presenter: Andre Leibsohn Martins
doi://10.26678/ABCM.ENCIT2022.CIT22-0327
Abstract
The reduction of the number of phases in the construction of na offshore well is a major driver for cost reduction. In order to achieve this goal, phases must be longer, resulting in additional challenges. . A critical aspect is related to phase II (no fluid return to surface) reaching high inclinations in order to allow 3 phase horizontal wells. Such phases are drilled with fluids with no carrying capacity, during 1500 m and inclinations as high as 65 degrees, resulting in expressive cuttings accumulation in the wellbore annulus. Drillstring trips are frequently obstructed by the cuttings bed. This way, It is necessary to carry on a series of operational procedures to guarantee proper hole cleaning and safe continuation of the drilling operation. This paper details novel design procedures which include the following steps: ● Defining cuttings bed height deposited along the wellbore annulus using traditional steady state cuttings transport models. This information is the initial condition for the desine of hole cleaning pills pumping. ● Estimation of the extension of the cuttings bed through a material balance. ● Estimation of drag efforts for drillstring movement in the presence of a cuttings bed. ● Calculation of the solids removal due to the pumping of hole cleaning pills based on a transiente solid liquid model. • Optimization of the frequency, volumes and pump rates for the cleaning pills.
Keywords
offshore drilling, hole cleaning, cuttings transport, torque & drag, Transient Model
