Displacements in Eccentric Annuli During Primary Cementing in Deviated Wells

Jakobsen, J.; Sterri, N.; Saasen, Arild; Aas, Bjarne; Kjosnes, I.; Vigen, A.

doi:10.2118/21686-ms

Cited by 35 publications

(7 citation statements)

References 5 publications

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“…However, the occurrence of GM and SCVF is higher in deviated wells than in vertical wells, indicating that wellbore deviation is a factor affecting overall wellbore leakage. Mechanical aspects such as casing centralization and cement slumping may contribute to the increased incidence of wellbore leakage in deviated wells (Jakobsen et al 1991).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores

Watson

Bachu

2009

SPE Drilling &Amp; Completion

268

140

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Implementation of carbon dioxide (CO 2) storage in geological media requires a proper assessment of the risk of CO 2 leakage from storage sites. Leakage pathways may exist through and along wellbores, which may penetrate or be near to the storage site. One method of assessing the potential for CO 2 leakage through wells is by mining databases that usually reside with regulatory agencies. These agencies collect data concerning wellbore construction, oil and gas production, and other regulated issues for existing wells. The Alberta Energy Resources Conservation Board (ERCB), the regulatory agency in Alberta, Canada, collects and stores information about more than 315,000 oil, gas, and injection wells in the province of Alberta. The ERCB also records well leakage at the surface as surface-casing-vent flow (SCVF) through wellbore annuli and gas migration (GM) outside casing, as reported by the industry. The evaluation of a leakage pathway through wellbore casing or annuli and what causes these wellbore leaks are the first step in determining what factors may contribute to wellbore leakage from CO 2-storage sites. By using available data, major factors that contribute to wellbore leakage were identified. Data analysis shows that there is a correlation between these SCVF/GM and economic activity, technology changes, geographic location, and regulatory changes regarding well completion and abandonment. Further analysis indicates a relationship between low-annular-cement top, external corrosion, casing failure, and wellbore leakage (SCVF/GM). Other factors that could affect the presence of wellbore leakage, such as wellbore deviation, surfacecasing depth, and wellbore density, were also investigated. This paper presents the findings of the data analysis and a method to evaluate the potential for leakage along wells in an area where CO 2 storage is intended. This information is useful not only for future operations of CO 2 storage in geological media, but also for current operations relating to the exploration and production of hydrocarbons.

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores

Watson

Bachu

2009

SPE Drilling &Amp; Completion

268

140

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“…The replacement of drilling fluids with cement to establish a barrier and to seal formation pressures hydraulically is the main task to be achieved during plug placement, besides the prime physical properties of the cured cement. Several parameters influencing mud displacement efficiency during plug placement include: hole geometry and inclination, flow rate, degree of turbulence, ECD, cement or mud and spacer design, hole conditioning, rheological behavior, buoyancy and plug stability, pulling out of plug, size of work string, and centralization of work string [3,[22][23][24][25][26]. Obviously, no single technique, will magically make mud displacement and cementing a success.…”

Section: Mud Displacement During Cementingmentioning

confidence: 99%

Fundamentals of Plug Placement

Khalifeh¹,

Saasen²

2020

Ocean Engineering &Amp; Oceanography

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The best practice of permanent plug and abandonment requires a cross sectional barrier, which is known as rock-to-rock barrier. The barrier is placed at the right depth where formation is capable to hold the maximum anticipated pressure. To fulfill the requirement, two general situations could be encountered: openhole plug placement or cased hole plug placement. Openhole Plug PlacementTo place a permanent cement plug in an openhole, the fluid in the well needs to be replaced with cement. As the compositions and properties of drilling (or milling) fluids and cement slurries vary widely, severe contamination can occur at the interface of drilling fluid and cement slurries due to incompatibility. Therefore, fluid removal during cement plug placement is a crucial task. Fluid RemovalFluid removal has been an interest for cement engineers for many years. To achieve the objectives, drilling fluid and pre-flushes must be fully removed from the openhole interval and be exchanged fully with cement or any plugging material. The fluid removal process is a function of borehole quality, circulation and displacement efficiency, fluid conditioning and properties of drilling fluids, spacers and washes [1][2][3][4][5][6]. Fluid removal process can be carried out in two main different ways: hydraulically or mechanically. In the hydraulic process, spacer fluids with specific viscous behavior are pumped ahead of cement slurry to displace drilling or milling fluid. The contamination effect of these spacer fluids on cement is less compared to drilling or milling fluids.

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“…Alguns trabalhos (92,93,148,118,127,103,83,9) atestam que o processo de deslocamento de fluidos em poço vertical é governado principalmente pelas razões de viscosidade e densidade, propriedades dos fluidos, geometria do poço (dimensões, excentricidade do espaço anular entre a coluna e o revestimento e inclinação) e vazão. Abdu (1) e Deawwanich (58) apresentam análises e discussões acerca da influência de cada um desses parâmetros na eficiência de deslocamento.…”

Section: Organização Do Trabalhounclassified

“…Diversos autores investigaram a influência da razão de viscosidade na eficiência de deslocamento. Jakobsen et al (103) Syed (165) revisou as práticas de projeto e posicionamento de tampão de cimento em poços com alta temperatura e pressão (HPHT) através de estudos de caso. Afirma que a estimativa da temperatura de fundo do poço é um fator fundamental para determinar as propriedades e comportamento dos fluidos durante o projeto da operação.…”

Section: Organização Do Trabalhounclassified

Posicionamento De Tampões Em Poços De Petróleo: Uma Investigação De Escoamentos De Inversão Por Gravidade

VARGES¹

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Displacements in Eccentric Annuli During Primary Cementing in Deviated Wells

Cited by 35 publications

References 5 publications

Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores

Evaluation of the Potential for Gas and CO2 Leakage Along Wellbores

Fundamentals of Plug Placement

Posicionamento De Tampões Em Poços De Petróleo: Uma Investigação De Escoamentos De Inversão Por Gravidade

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