Analysis of Hole Cleaning for a Vertical Well

Abstract

Vertical or straight hole drilling that usually has less than 30 degree still is utilized to drilling operations in conventional and even in unconventional resources in nowadays worldwide for increasing recovery i.e. higher rate of penetration where there are kind of challenges that demand investigation of this type of drilling. One key challenge is efficient hole cleaning or cuttings removal which can lead to issues related to hole problems and consequently problems such as high over pull margins and stuck pipe may occur. Furthermore, inappropriate use of drilling fluid properties at different stages of drilling operation causes the hole to collapse due the accumulation of cuttings in the annulus as well as at the wellbore. The present study introduces an analytical and a numerical model for a vertical well that can be used to optimize drilling operations. The transport velocity i.e. the ration of the annular velocity and slip velocity is so vital in hole cleaning. Inefficient hole cleaning may lead to problems such as, slow drilling rates which increase drilling time and costs. For a vertical well, as addressed in the literature, the proper hole cleaning is basically dependent on drilling hydraulics or mud rheology liked rilling fluid density, viscosity and thixotropy or gel strength. Based on the proposed predictions of the above-mentioned parameters that are significant to avoid formation damage while drilling a vertical hole. The present article analysis the data related to efficient drilling operations, hole cleaning for a vertical well and the results revealed that mud rheology, density, transport velocity, pipe rotation and the depth of the well are the controlling factors that influence hole cleaning.

Optimization of Water Based Drilling Fluid Properties with the SiO2/g-C3N4 Hybrid

“…The key factor affecting fluid flow in the reverse direction is the yield point (YP). The capacity of drilling fluid to remove drilling cuttings from downhole and transport them to the surface is often accomplished via the YP characteristic . Electrical ions in the vicinity of the active chemical cause this parameter, which is introduced into a fluid via electrostatic forces.…”

“…The capacity of drilling fluid to remove drilling cuttings from downhole and transport them to the surface is often accomplished via the YP characteristic. 59 Electrical ions in the vicinity of the active chemical cause this parameter, which is introduced into a fluid via electrostatic forces. The electrical charges that are present on the surfaces of the interacting particles generate these electrochemical forces.…”

Settling of Drilling Cuttings in Polymeric Solutions: A Parametric Investigation

“…Cuttings quickly settle down in the drilling fluid when drilling activities are stopped under specific conditions, such as the connection of the drill pipe. Cutting concentration in the vertical portion and cutting bed thickness in the deviated sections are both impacted by settling velocity. , The chance that the cuttings may settle and the cuttings may bury the drill bit inside the wellbore increases if the settling velocity is very high because the cutting bed or cutting plug will soon form in the deviated portions. − In horizontal and deviated wells, efficient wellbore cleaning is crucial. It may avoid issues like stuck pipe, lost circulation, high torque and drag, and loss of control on equivalent circulation density (ECD).…”

Numerical Simulation of Hole Cleaning of a Horizontal Wellbore Model with Breakout Enlargement Section

“…The horizontal wellbore approach is often employed in unconventional petroleum and natural gas development [2][3][4][5]. The contact area between the wellbore and the petroleum and natural gas reservoir is larger for horizontal wells than for vertical wells, which can effectively increase the recovery rate for petroleum and natural gas production [6][7][8].…”