Understanding Fluid Displacement in Extended-Reach Drilled Wells

Yerubandi, Krishna Babu; Hennessy, Kathryn; Jogdand, Anoop

doi:10.2523/iptc-20330-ms

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Running the primary displacement flow in turbulent for cement placement has not been proven to provide better displacements. As earlier discussed, some works such as the ones of Foroushan et al [39,40] and Yerubandi et al [31] suggested that keeping the flow rate below a certain level provided better displacements. McLean et al [23] concluded that the turbulent flow did not offer a better displacement, and thinning the cement to run it in turbulent regime caused additional channeling.…”

Section: Kelvin-helmholtz Type Of Instabilitymentioning

confidence: 90%

“…They showed that a critical value of flow rate can be obtained, below which the interface remains stable and, having proper density and viscosity contrasts, a good displacement can be achieved. Yerubandi et al [31] explored the fluid displacement in extended-reach drilled wells and concluded that increasing the flow rate, while having a good density hierarchy, deteriorated the cement placement process.…”

Section: Flow Regimementioning

confidence: 99%

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Cement Placement: An Overview of Fluid Displacement Techniques and Modelling

et al. 2021

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During drilling operations, effective displacement of fluids can provide high-quality cementing jobs, ensuring zonal isolation and strong bonding of cement with casing and formation. Poor cement placements due to incomplete mud removal can potentially lead to multiple critical operational problems and serious environmental hazards. Therefore, efficient mud removal and displacement of one fluid by another one is a crucial task that should be designed and optimized properly to guarantee the zonal isolation and integrity of the cement sheath. The present work provides an overview of the research performed on mud removal and cement placement to help the industry achieve better cementing jobs. An extensive number of investigations have been conducted in order to find some key techniques for minimizing the cement contamination and obtaining maximum displacement efficiency. Yet, even after implementing those techniques, the industry happens to encounter poor cementing jobs. The present review aims to assist with evaluating the current theories, methodologies, and practical techniques, in order to possibly identify the research gaps and facilitate the way for further improvements.

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Section: Kelvin-helmholtz Type Of Instabilitymentioning

confidence: 90%

Section: Flow Regimementioning

confidence: 99%

Cement Placement: An Overview of Fluid Displacement Techniques and Modelling

et al. 2021

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Longest 9 5/8" Casing Cementing in ERD Well, A Worldwide-Record

Sasso

Alzaki

Zuleta

et al. 2022

Day 3 Wed, February 23, 2022

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The efficient placement of cement as a verified barrier above a distinct permeable zone in any oil and gas well is a constant challenge faced by the industry. Absence of isolation behind the casing represents a deficiency to the required well integrity barriers. A compromised well barrier may result in casing corrosion, leaks, and eventually sustained casing pressure which might lead the loss of the asset and/or endanger the safety or workers and/or the environment. Ultimately, a compromised barrier implies compromised well integrity. Fluid displacement in ERD wells is different from conventional wells and the job conditions pose additional challenges. To ensure adequate cement placement in this ultra-ERD well, several challenges had to be addressed. Hence, an optimized cement placement method that focused on ECD management to prevent induced loss circulation included maintaining fluids displacement regimes, fluid density, and hydraulic friction hierarchy. Moreover, casing centralization was imperative. Limiting casing string movement once the string deployed successfully to bottom equally added to the challenge. A system's approach was utilized to achieve the level of optimization desired. Slurry rheology and fluid loss control were adjusted. A pumping schedulethat ensured that optimum displacement efficiencies were achieved in line with the designed rheology was used. The impact of pump rates on downhole ECD regimes were equally evaluated and confirmed to be fit-for-purpose. Mud conditioning prior to the cement displacement and spacer wettability were also of paramount importance. A centralizer spacing resulting in >70% stand-off was utilized. These optimized practices represented the results of 3D modeling used to understand the fluid dynamics, and its distribution under the influence of a horizontal static pipe. This work also presented a comprehensive sensitivity analysis not only on the effects of thermal thinning on fluid rheology, but also on gravitational forces acting on the fluids in an ERD well. After execution, a combination of cement bond logs, ultrasonic measurements, and advanced interpretation techniques were used to evaluate the cement bond quality. The logs showed an improved cement bonding with minimal to no channeling, and excellent radial cement coverage. As global hydrocarbon resources become harder to reach, ERD wells maybe required to access such subsurface targets. Adequate cementing well integrity is crucial to assuring the long-term integrity of such wells for the economic life of the assets. The practices implemented in this case history will contribute to expanding the tools and techniques available to engineers to achieving excellent barrier isolation in such wells.

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Understanding Fluid Displacement in Extended-Reach Drilled Wells

Cited by 2 publications

References 10 publications

Cement Placement: An Overview of Fluid Displacement Techniques and Modelling

Cement Placement: An Overview of Fluid Displacement Techniques and Modelling

Longest 9 5/8" Casing Cementing in ERD Well, A Worldwide-Record

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