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

Kerunwa, Anthony

doi:10.11648/j.ogce.20200806.16

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…Fluid rheology affects fluid shearing with the walls of the annulus or pipe [28]. Newtonian fluids behave differently from non-Newtonian fluids [30]. Most fluids used in well operations are adequately model as non-Newtonian fluids.…”

Section: Fluid Rheologymentioning

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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Section: Fluid Rheologymentioning

confidence: 99%

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

Kerunwa¹,

Obibuike²,

Duru³

et al. 2021

OJOGas

Self Cite

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“…Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License much easier, faster, and at optimally reduced operational costs. Operators have given more interest to complex wells such as extended reach wells, horizontal wells (Kerunwa, 2020b), multilateral wells, etc., because of their advantages over conventional vertical wells. These wells have increased well-reservoir contacts which translate to higher productivity, higher sweep efficiency, and more drainage.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the viscous fluid effect on torque and drag modeling in highly deviated wells

Anthony,

Charley,

Inyang

et al. 2024

J. Petroleum Gas Eng.

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In this work, the effects of the viscous flow of fluids on torque and drag simulation results were investigated for down-hole strings. Torque and drag simulations were performed with and without the inclusion of viscous fluid effects, the influence viscous fluid effects inclusion had on torque and drag simulation results were determined and the consequence this margin of influence would pose to drilling operation. Well plan software was used for the simulation; two cases were considered. Case 1 considered the torque and drag simulation without the inclusion of viscous fluid effects. Case 2 considered the torque and drag simulation with the inclusion of viscous fluid effects. Simulations were run for open hole friction factors (OHFF) of 0.15, 0.2 and 0.25 and cased-hole friction factors (CHFF) of 0.2. From the results, it was realized that the maximum effective tension and maximum hookeload decreased by approximately 2.1 kilopounds (kips) for tripping in operation and by approximately 3.3 kips for tripping out operation, and sliding and drilling (rotating-on-bottom) operations remained unchanged due to the inclusion of viscous effects of fluid flow. Analyses of drag and torque revealed that the maximum drag decreased by 2.1 kips for tripping in (slack-off drag) and by 3.3 kips for tripping out (Pickup drag) operations and maximum torque during drilling operation increased by approximately 310.3 ft-lbs due to the inclusion of the viscous effect of fluid flow.

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“…Furthermore, advances in the technologies of drilling play a crucial role in meeting energy demand that is globally needed because they aid the discovery of new resources, they provide access to remote or harsh locations increasing the development of challenged reservoirs, which were previously uneconomical to produce (Okabe et al, 2013). Drilling problems tend to be more pronounced as oil and gas operations move into more challenging and difficult terrains (Kerunwa, 2020b). Although technologies for drilling horizontal and ERD wells have improved, one can still encounter many drilling issues.…”

Section: Introductionmentioning

confidence: 99%

Incorporating Tool Joint Influence on Model for Equivalent Circulation Density Estimation in Horizontal Well Drilling

Kerunwa¹

2022

BJPG

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Modern drilling techniques involving horizontal well (HW) drilling for production of petroleum verify that the well is adequately planned prior to commencement of drilling or completion, especially in drilling of deep and ultra-deep water wells. Because of more rigorous and complex well geometries, planning ensures that drilling or/and completion engineers reach target depths in their respective operations. Equivalent circulation density (ECD) is one of the parameters that is monitored and controlled during well planning and drilling of wells. ECD, when properly managed, leads to successful drilling especially when working in areas of narrow mud-weight window. Poor management of ECD could result in severe problems during drilling such as loss of circulation and kicks. Mud column hydrostatic head and annular frictional pressure loss (AFPL) govern ECD. As such, several factors influence ECD viz: drill string (DS), well geometry, rheology of drilling fluid, and flow rates. Several literature studies have focused on fluid flow through annuli and pipes for AFPL computations. However, tool joint (TJ) effect in the estimation of pressure loss (PL) in annulus is either ignored or underestimated in several cases. The overall contribution of TJs effect on ECD is of great importance. In this paper, TJ effect on AFPL has been evaluated. Dimensional analysis and theoretical methods were utilized for model development that incorporates TJs effect for AFPL computation and, consequently, ECD prediction. AKUBU X12 well, a HW with measured depth (MD) of 11070ft from Niger delta was utilized as a case study. Mud of 8.6 ppg was utilized for the study with model simulation carried out using Matlab software (by Mathworks Inc.-version R2014B). Results show that as the rate of flow increases, TJs presence creates strong hydraulic resistance, which increases localized AFPL and ECD. Also, as the depth and rate of flow increases, the AFPL also increases, leading to an increase in ECD. Pipe rotation affects PL. Such increase in pipe rotation causes PL to either decrease or increase depending on shear thinning as well as inertial effect. Thus, for accurate prediction of ECD and wellbore pressure, TJ effects should be considered.

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

Cited by 3 publications

References 16 publications

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

The Effects of Fluid Rheology and Drillstring Eccentricity on Drilling Hydraulics

Investigation of the viscous fluid effect on torque and drag modeling in highly deviated wells

Incorporating Tool Joint Influence on Model for Equivalent Circulation Density Estimation in Horizontal Well Drilling

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