Modeling of Environmental Fate and Effects of Oil Leakages from Abandoned Subsea Wells Using an Environmental Impact Factor Tool

Pham, Hanh Ht; Lohne, Hans Petter; Arild, Øystein; Schlenk, Daniel; Pampanin, Daniela M.

doi:10.1002/ieam.4392

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…Alves proposed a method for evaluating the probability of uncontrolled external leaks in subsea wells during the production phase [9] . Hanh conducted simulation research on the fate and impact of oil spills from abandoned oil wells [10] . Zhang established a continuous annular pressure model caused by multiple oil pipe leakage points [11] .…”

Section: Introductionmentioning

confidence: 99%

A New Calculation Method of Well Leakage in Gas Well with Annular Pressure

Yuan,

Luo,

2024

E3S Web Conf.

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The gradual promotion of the concept of gas well integrity has made major oil and gas fields pay more and more attention to the integrity management and evaluation of gas wells with annular pressure. Annular leakage rate is one of the key parameters for gas well integrity evaluation. However, the leakage rate measurement of high-temperature, high-pressure, and acid-containing gas wells has high risks and costs, which are often difficult to obtain in field operations. In order to obtain the bottom hole leakage rate parameters of the gas well to assist the integrity evaluation, this article is based on the safety valve leakage model and the small hole leakage model, combined with the characteristics of the gas well with annulus pressure, the idea of applying the annulus leakage rate calculation from the perspective of model mechanism is analysed, and the model parameters are clarified as well. The application of the two leak models is compared by case wells calculation, which verifies their rationality and feasibility. The research of this paper provides a theoretical basis for the leakage evaluation of gas well with annular pressure, and promotes development of gas well integrity management research.

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Section: Introductionmentioning

confidence: 99%

A New Calculation Method of Well Leakage in Gas Well with Annular Pressure

Yuan,

Luo,

2024

E3S Web Conf.

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Use of DREAM to assess relative risks of presence of pharmaceuticals and personal care products from a wastewater treatment plant

Pampanin,

Schlenk,

Vitale

et al. 2024

Front. Environ. Sci. Eng.

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Tracer-Based Monitoring of P&A in Offshore Fields

Silva

Brandvoll

Hubred

et al. 2023

SPE EuropEC - Europe Energy Conference Featured at the 84th EAGE Annual Conference &Amp; Exhibition

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Thousands of offshore wells are planned to be permanently plugged and abandoned worldwide up to 2050. Fractures are known to occur and develop in the materials used as seals/plugs, creating channels that compromise P&A integrity. This risk is increased by the foreseeable use of oil and gas assets in CCS and hydrogen storage projects. Existing monitoring methods may fail to provide early warning of issues with plug integrity. There is presently no regulation in place on Norwegian Continental Shelf about long-term monitoring of permanently plugged and abandoned wells, however, this situation is likely to change in the future. Thus, cheap, and effective methods to monitor the integrity of long-term P&A of offshore wells are necessary. The existing technology for P&A is sufficiently mature to dramatically reduce the risk of a "catastrophic" failure in its deployment. Thus, if the integrity of permanent barriers is compromised, it is likely that this will happen through the establishment of micro-fractures where very small flowrates of reservoir fluids can escape or diffuse to the marine environment. If such early signs are detected, then a more thorough diagnose and mitigation campaign can be deployed in a timely manner. Tracer technology can provide this type of early warning. By including tracers in the P&A projects, either deploying a slug just before the installation of barriers, or embedded in the barrier material matrix, these substances will be detected in the waters around the plugged well head, if channels allow for the circulation of fluids between the bottom and top of the wells. Most (if not all) existing tracers are detectable in the ng/L (ppt) level, thus providing a warning system even if just diffusion occurs. The tracers qualified for use in oil & gas reservoirs are not exposed to the presence of materials used in plugs/barriers in P&A. Many of these materials (e.g., cement-based) exhibit surfaces with relatively high energies and activities. Thus, it is critical to evaluate tracer response for this type of new application. In the present document, we present an initial study to evaluate long-term stability and dynamic flooding properties of existing water-based tracers in the presence of Portland cement and CO2 originated ions. The stability experiments were performed at two different temperatures. The dynamic flooding properties were evaluated relatively to tritiated water in a reference barrier cell constructed with known defects. The cell used (referred to in the present document as plug) consisted of a well section with cemented casing (Portland), constructed on purpose to allow for fluid circulation in a "microannulus". Results show that further evaluation and development of the concept of using tracers as an early warning system for permanent P&A is necessary. However, of the 8 tested tracers, 4 exhibit an ideal or close to ideal flooding behavior in the microannulus system that open the doors to such an application. Results also suggest that tracer tests using conventional inter-well water tracers can be devised to assess the quality of both borehole and casing cementing in conventional well-completion operations.

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Modeling of Environmental Fate and Effects of Oil Leakages from Abandoned Subsea Wells Using an Environmental Impact Factor Tool

Cited by 3 publications

References 32 publications

A New Calculation Method of Well Leakage in Gas Well with Annular Pressure

A New Calculation Method of Well Leakage in Gas Well with Annular Pressure

Use of DREAM to assess relative risks of presence of pharmaceuticals and personal care products from a wastewater treatment plant

Tracer-Based Monitoring of P&A in Offshore Fields

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