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Hole cleaning is one ofa major considerations foron both the design, and a  1 execution of drilling operations. Especially in well’s that havingThis is especially true in wells with a high- inclination, if for which the fluid velocity
is lowest may be lower 2 thaen a critical value; a stationary bed is developed makes, which may causes several problems, such as a higher probability of stuck a pipe getting stuck, high -drag, and higher hydraulic requirements
etc.3, if not removed properly not [1-5]. In order to clearTo avoid such problems, generated any cuttings generated will have too be taken outremoved from the wellbore through help ofusing a drilling fluid. Factors that influenceing cutting transport includes drilling fluidthe flow rate, drilling fluid viscoscity, drilling fluid weight, and ; drilling fluid type of drilling fluid, as well as the; hole size, rotational speed, eccentricity, penetration-rate, and cutting size. Efficient cutting transport are is presumed to be achieved when the pump-flow–rate 4 above exceeds a critical flow–ratevalue. An inadequate pump- flow rate may bring cause cuttings to fall back to the bottom of the hole. In inclined highly vertical and horizontal wells, cutting beds—i.e., occur frequently ie. fall-back back-fallen cuttings that have piled up onin the surface of the a wellbore—occur frequently.

A lot of Several cutting- transportation models have beening developed.
Nowadays, it was common to recognize a tTwo main approaches can be recognized 5
: an empirical approach, and an mechanistic approach [6]. However, these the present study employsed three models, developed through an empirical approach; these are the ie. Rudi-Shindu’s model [7], Hopkins’ model [8], and Tobennas model [9]. In 1995, Hopkins listed all variables that is required too determine the minimum flowing rate. After several year,Several years later, Rudi–Shindu introduced the slip velocity, and correction factors for the to drilling- fluid weight, and the for the angularle inclination. Tobeenna6 developed a model in 2010 tofor calculate the critical flow rateing for deviated wells based to on Bern-Lous method. The models was are compared to case-study wells. 2 examplesTwo exemplary wells that mimickeding operational conditions are considered.

Explanations

Hole cleaning is one ofa major considerations foron both the design, and a  1  execution of drilling operations. In particular, Especially in wells that having a high- inclination, if the fluid velocity is lowestlower thaen a critical value; a stationary bed is developed makes, which may causes several problems, such as a higher probability of stuck a pipe getting stuck, high -drag, and higher hydraulic requirements etc.2 , if not removed properly not [1-5]. In order tTo clear avoid such problems, generated any cuttings generated will have too be taken outremoved from the wellbore through help ofusing a drilling fluid. Factors that influenceing cutting transport includes drilling fluidthe flow rate, drilling fluid viscoscity, drilling fluid weight, and ; drilling fluid type of drilling fluid, as well as the; hole size, rotational speed, eccentricity, penetration-rate, and cutting size. Efficient cutting transport are is presumed to be achieved when the
pump-flow–rate 3 above exceeds a critical flow–ratevalue. An inadequate pump- flow rate may bring cause cuttings to fall back to the bottom of the hole. In inclined highly vertical and horizontal wells, cutting beds occur frequently, i.e., fall-back back-fallen cuttings that pile up onin the surface of the a wellbore.

A lot of Several cutting- transportation models have beening developed. Nowadays, it was common to recognize a tTwo main common approaches: include an empirical approach, and an mechanistic approach [6]. However, these this study employsed three models, developed through an empirical approach, i.e., Rudi-Shindu’s model [7], Hopkins’ model [8], and Tobennas model [9]. In 1995, Hopkins listed all variables that is required too determine the minimum flowing rate. After several year,Several years later, Rudi–Shindu introduced the slip velocity, and correction factors for the to drilling- fluid weight, and the for the angularle inclination. Tobeenna 4 developed a model in 2010 tofor calculate the critical flow rateing for deviated wells based to on Bern-Lous method. The models was are compared to case-study wells. 2 examplesTwo exemplary wells that mimickeding operational conditions are considered.

Explanations

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