Determining whether the swirling jet is applicable in bottom-hole cleaning: A CFD study

AbstractEfficient cuttings transport and improving rate of penetration (ROP) are two major challenges in horizontal drilling and extended reach drilling. A type of jet mill bit (JMB) may provide an opportunity to catch the two birds with one stone: not only enhancing cuttings transport efficiency but also improving ROP by depressuring at the bottom hole. In this paper, the JMB is further improved and a new type of depressure-dominated JMB is presented; meanwhile, the depressurization capacity of the depressure-dominated JMB is investigated by numerical simulation and experiment. The numerical study shows that low flow-rate ratio helps to enhance the depressurization capacity of the depressure-dominated JMB; for both depressurization and bottom hole cleaning concern, the flow-rate ratio is suggested to be set at approximately 1:1. With all other parameter values being constant, lower dimensionless nozzle-to-throat-area ratio may result in higher depressurization capacity and better bottom hole cleaning, and the optimal dimensionless nozzle-to-throat-area ratio is at approximately 0.15. Experiments also indicate that reducing the dimensionless flow-rate ratio may help to increase the depressurization capacity of the depressure-dominated JMB. This work provides drilling engineers with a promising tool to improve ROP.

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Improvement of Bottom-Hole Cleaning After Hydraulic Fracturing on Urengoy Oil and Gas Condensate Field

10.2118/166861-ms ◽

2013 ◽

Author(s):

Ivan Buriak

Keyword(s):

Hydraulic Fracturing ◽

Oil And Gas ◽

Gas Condensate ◽

Hole Cleaning ◽

Bottom Hole

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Evaluation of drilling hydraulic calculation to the ability of bottom hole cleaning

Journal of Physics Conference Series ◽

10.1088/1742-6596/1402/5/055109 ◽

2019 ◽

Vol 1402 ◽

pp. 055109

Author(s):

H Widiyatni ◽

A Rizkina ◽

W I Dirastri

Keyword(s):

Hydraulic Calculation ◽

Hole Cleaning ◽

Bottom Hole

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A Comparative Study of Hole Cleaning Performance — Water Versus Drag Reducing Fluid

Volume 5: Materials Technology; Petroleum Technology ◽

10.1115/omae2014-24083 ◽

2014 ◽

Cited By ~ 2

Author(s):

Fabio Ernesto Rodriguez Corredor ◽

Majid Bizhani ◽

Ergun Kuru

Keyword(s):

Experimental Program ◽

Flow Loop ◽

Carrier Fluid ◽

Hole Cleaning ◽

Hole Pressure ◽

Bottom Hole Pressure ◽

Bottom Hole ◽

Operational Window ◽

Critical Velocities ◽

Hydrolyzed Polyacrylamide

Effective hole cleaning in horizontal and extended reach wells (ERD) often requires use of high circulation rates, which may not be always achievable due to the risk of circulating bottom hole pressure reaching the fracture limit of the rock. Achieving good hole cleaning while keeping the circulating bottom hole pressure within the safe operational window is very often the major engineering challenge. A drag reducing fluid with good hole cleaning ability could be a potential solution in this case. In order to see if it is possible to use a drag reducing fluid and still achieve a good hole cleaning, an experimental program was designed and conducted. The main objective of this experimental study was to compare the hole cleaning performances of water and a drag reducing fluid. The hole cleaning experiments were conducted using a 9m long horizontal flow loop with concentric annular geometry (Outer Pipe ID = 95 mm, Inner Pipe OD = 38 mm, ID/OD ratio = 0.4). The drag reducing additive was a commercially available partially hydrolyzed polyacrylamide (PHPA). Water and two drag reducing fluids with 0.07% V/V and 0.1% V/V PHPA concentrations were used. Critical velocities for the initiation of cuttings movement with rolling, saltation/dunes, and suspension modes were determined and compared when using water and drag reducing fluids as a carrier fluid. Critical velocities for the initiation of cuttings movement were found to be lower with water than that of drag reducing fluid in all transport modes.

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Improvement of Bottom-Hole Cleaning After Hydraulic Fracturing on Urengoy Oil and Gas Condensate Field (Russian)

10.2118/166861-ru ◽

2013 ◽

Author(s):

Ivan Buriak

Keyword(s):

Hydraulic Fracturing ◽

Oil And Gas ◽

Gas Condensate ◽

Hole Cleaning ◽

Bottom Hole

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Benefits of Using Continuous Circulation Systems in ERD Wells to Manage ECD, Bottom Hole Pressure and Hole Cleaning

10.2118/202140-ms ◽

2021 ◽

Author(s):

Scott William Petrie ◽

Rick Doll

Keyword(s):

Drill Pipe ◽

Key Factors ◽

Hole Cleaning ◽

Hole Pressure ◽

Bottom Hole Pressure ◽

Bottom Hole ◽

High Pressure High Temperature ◽

Angle Section ◽

Time Required ◽

Extended Reach Drilling

Abstract Continuous Circulation Systems (CCS) have been around since the JIP between Shell, BP, Statoil, BG, Total and Eni in October 2000. Initial reports of these systems demonstrated that while cumbersome, the use of CCS is of benefit to drilling ERD wells. Continuous circulation keeps cuttings moving out of the wellbore, reducing or eliminating the time required to circulate clean any high-angle section before making a drill pipe connection or before tripping out of the hole. Continuous Circulation over each connection enhances the management of Equivalent Circulating Density(ECD) to control the bottom hole pressure on the well by never switching off the pumps, therefore the wellbore never experiences an Equivalent Static Density(ESD). Through this mechanism, the application of CCS has also been proven to manage bottom hole pressure constantly, which in conjunction with good drilling practices for torque and drag management, are key factors in drilling any Extended Reach Drilling(ERD), Complex or High Pressure/High Temperature (HPHT) well.

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