Contributory Influence of Drill Cuttings on Equivalent Circulation Density Model in Deviated Wellbores

Kerunwa, Anthony

doi:10.11648/j.ogce.20200804.12

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…Other factors that influence ECD include the presence of drill cuttings in the wellbore and the depth and diameter of the wellbore. The surge pressure is also controlled during drilling to ensure safe operations and speed up pipe tripping [ 13 , 14 ]. Controlling the well pressure and ECD is a critical aspect of drilling horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

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A Developed Robust Model and Artificial Intelligence Techniques to Predict Drilling Fluid Density and Equivalent Circulation Density in Real Time

Al-Rubaii,

Al-Shargabi,

Aldahlawi

et al. 2023

Sensors

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When drilling deep wells, it is important to regulate the formation pressure and prevent kicks. This is achieved by controlling the equivalent circulation density (ECD), which becomes crucial in high-pressure and high-temperature wells. ECD is particularly important in formations where the pore pressure and fracture pressure are close to each other (narrow windows). However, the current methods for measuring ECD using downhole sensors can be expensive and limited by operational constraints such as high pressure and temperature. Therefore, to overcome this challenge, two novel models named ECDeffc.m and MWeffc.m were developed to predict ECD and mud weight (MW) from surface-drilling parameters, including standpipe pressure, rate of penetration, drill string rotation, and mud properties. In addition, by utilizing an artificial neural network (ANN) and a support vector machine (SVM), ECD was estimated with a correlation coefficient of 0.9947 and an average absolute percentage error of 0.23%. Meanwhile, a decision tree (DT) was employed to estimate MW with a correlation coefficient of 0.9353 and an average absolute percentage error of 1.66%. The two novel models were compared with artificial intelligence (AI) techniques to evaluate the developed models. The results proved that the two novel models were more accurate with the value obtained from pressure-while-drilling (PWD) tools. These models can be utilized during well design and while drilling operations are in progress to evaluate and monitor the appropriate mud weight and equivalent circulation density to save time and money, by eliminating the need for expensive downhole equipment and commercial software.

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Section: Introductionmentioning

confidence: 99%

“…Proper drilling fluid designs can enhance drilling efficiency and minimize incidents. Nevertheless, laboratory testing is still the primary method used to determine the drilling fluid’s qualities [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

A Developed Robust Model and Artificial Intelligence Techniques to Predict Drilling Fluid Density and Equivalent Circulation Density in Real Time

Al-Rubaii,

Al-Shargabi,

Aldahlawi

et al. 2023

Sensors

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show abstract

“…In vertical wells, the influence of cuttings on drilling hydraulics is not profound. Cuttings deposition increases when wells deviate from vertical and become highest in horizontal wells [7] [8].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

Kerunwa¹,

Obibuike²,

Duru³

et al. 2021

OJOGas

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Accurate determination of hydraulic parameters such as pressure losses, equivalent circulation density (ECD), etc. plays profound roles in drilling, cementing and other well operations. Hydraulics characterization requires that all factors are considered as the neglect of any could become potential sources of errors that would be detrimental to the overall well operation. Drilling Hydraulics has been extensively treated in the literature. However, these works almost entirely rely on the assumption that the drill string lies perfectly at the center of the annulus-the so-called "concentric annulus". In reality, concentricity is almost never achieved even when centralizers are used. This is because of high well inclination angles and different string geometries. Thus, eccentricity exists in practical oil and gas wells especially horizontal and extended reach wells (ERWs) and must be accounted for. The prevalence of drillstring (DS) eccentricity in the annulus calls for a re-evaluation of existing hydraulic models. This study evaluates the effect of drilling fluid rheology types and DS eccentricity on the entire drilling hydraulics. Three non-Newtonian fluid models were analyzed, viz: Herschel Bulkley, power law and Bingham plastic models. From the results, it was observed that while power law and Bingham plastic models gave the upper and lower hydraulic values, Herschel Bulkley fluid model gave annular pressure loss (APL) and ECD values that fall between the upper and lower values and provide a better fit to the hydraulic data than power law and Bingham plastic fluids. Furthermore, analysis of annular eccentricity reveals that APLs and ECD decrease with an increase in DS eccentricity. Pressure loss reduction of more than 50% was predicted for the fully eccentric case for Herschel Bulkley fluids. Thus, DS eccentricity must be fully considered during well planning and hydraulics designs.

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“…One area of this optimisation is in drilling and completions [1]. Drilling in oil and gas asset development requires high investment cost [2,3]. Owing to this, operators seek ways to efficiently reach target depths at least overall drilling costs [3].…”

Section: Introductionmentioning

confidence: 99%

“…Drilling in oil and gas asset development requires high investment cost [2,3]. Owing to this, operators seek ways to efficiently reach target depths at least overall drilling costs [3]. The development of longer reach or ERWs enables maximum contact with reservoirs allowing more drainage area and requiring less number of platforms on new development assets.…”

Section: Introductionmentioning

confidence: 99%

Drillstring Buckling Prediction and Its Impact on Tool-Joint Effects in Extended Reach Wells

Kerunwa¹

2020

OGCE

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The mechanism of buckling has been extensively studied in pipes and tubings. But these studies more often has been restricted to continuous or straight body pipes. In reality most pipes and other drillstring elements have end couplings or connections known as tool joint. Tool joint presence changes the annular geometry, hydraulics and stress distribution of the pipe or tubulars in the wellbore. Modelling drillstring in highly deviated wells with no regards to the tool joint effects has been a major source of error in many drilling mechanics analysis. This has often led to misleading information on buckling and bending of the pipe which could lead to drilling and completion problems and costly well interventions. Thus it becomes necessary to model tool joint effect in the drillstring as it is subjected to downhole forces and stresses. In this study, emphasis is made on the determination of tool joint effect on pipe buckling for highly deviated extended reach wells (ERWs). WellPlan T&D spreadsheet software was used for the simulation. The simulation was runned for pipe with tool joint and the same pipe with the tool joints removed. Results show that jointed pipes has similar buckling behaviour with continuous straight body pipes with buckling starting from sinusoidal buckling mode and gradually entering the helical buckling mode for both types of pipes. Furthermore, result revealed that tool joint presence increases the critical buckling force by an average of 28.9% for helical as well as (AWA) sinusoidal buckling modes.

show abstract

Contributory Influence of Drill Cuttings on Equivalent Circulation Density Model in Deviated Wellbores

Cited by 10 publications

References 13 publications

A Developed Robust Model and Artificial Intelligence Techniques to Predict Drilling Fluid Density and Equivalent Circulation Density in Real Time

A Developed Robust Model and Artificial Intelligence Techniques to Predict Drilling Fluid Density and Equivalent Circulation Density in Real Time

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

Drillstring Buckling Prediction and Its Impact on Tool-Joint Effects in Extended Reach Wells

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