Dynamic modeling of environmental risk associated with drilling discharges to marine sediments

Date

2015-10

Author

Durgut, İsmail
Reed, Mark
Smit, Mathijs G.D.
Ditlevsen, May Kristin

Metadata

Show full item record

Item Usage Stats

375
views

0
downloads

Drilling discharges are complex mixtures of base-fluids, chemicals and particulates, and may, after discharge to the marine environment, result in adverse effects on benthic communities. A numerical model was developed to estimate the fate of drilling discharges in the marine environment, and associated environmental risks. Environmental risk from deposited drilling waste in marine sediments is generally caused by four types of stressors: oxygen depletion, toxicity, burial and change of grain size. In order to properly model these stressors, natural burial, biodegradation and bioturbation processes were also included. Diagenetic equations provide the basis for quantifying environmental risk. These equations are solved numerically by an implicit-central differencing scheme. The sediment model described here is, together with a fate and risk model focusing on the water column, implemented in the DREAM and OSCAR models, both available within the Marine Environmental Modeling Workbench (MEMW) at SINTEF in Trondheim, Norway.

Subject Keywords

Drilling discharge, Marine sediment pollution, Environmental risk, Mathematical modeling, Diagenetic model

URI

https://hdl.handle.net/11511/28562

Journal

Marine Pollution Bulletin

DOI

https://doi.org/10.1016/j.marpolbul.2015.07.019

Collections

Department of Petroleum and Natural Gas Engineering, Article

Suggestions

OpenMETU
Core

Random walk particle-tracking method for modeling changes of sediment characteristics in marine sediments after drilling discharges Özdemir, Rabia Tuğçe; Durgut, İsmail (Elsevier BV, 2019-08-01) Adverse impacts of drilling discharges on marine benthic environments have been observed since the advent of offshore drilling operations for exploration and production of oil and gas. This study utilizes a marine sediment model based on a system of equations that has been developed earlier to assess environmental impacts of drilling waste discharges. Bioturbation, bio-degradation and natural burial processes are included in the model. The model is based on the diagenetic equations, providing vertical conce...
Particle tracking modeling of marine sediment pollution Özdemir, Rabia Tuğçe; Durgut, İsmail; Department of Petroleum and Natural Gas Engineering (2015) Drilling cuttings, chemicals and drilling mud that are discharged to the sea during drilling in offshore, affect sediment habitat at sea floor. The main stressors describing the impact of discharges on marine sediment are, burial, toxicity and free oxygen depletion. In order to determine the effects of mixing of the discharged material in the sediment column, one dimensional particle tracking model that utilizes the random walk method was developed for estimating the free oxygen, natural carbon and added ch...
Computer simulation of a complete biological treatment plant Topkaya , Pınar; Gökçay, Celal Ferdi; Department of Environmental Engineering (2008) Nitrogen and phosphorus removal is often required before discharge of treated wastewater to sensitive water bodies. Kayseri Wastewater Treatment Plant (KWWTP) is a biological wastewater treatment plant that includes nitrogen and phosphorus removal along with carbon removal. The KWWTP receives both municipal wastewater and industrial wastewaters. In this study, KWWTP was modeled by using a software called GPS-X, which is developed for modeling municipal and industrial wastewaters. The Activated Sludge Model ...
The effects of aquifer heterogeneity on the natural attenuation rates of chlorinated solvents Önkal, Başak; Ünlü, Kahraman; Department of Environmental Engineering (2005) Monitored natural attenuation has been particularly used at sites where petroleum hydrocarbons and chlorinated solvents have contaminated soil and groundwater. One of the important aspects of the methodology that has been recognized recently is that the mass removal rates, the most important parameter to determine effectiveness of the methodology, is controlled by the groundwater flow regime and the aquifer heterogeneity. Considering this recognition, the primary objective of this study is to quantitatively...
Numerical modeling of counter-current spontaneous imbibition during underbalanced drilling Naseri, Masoud; Sınayuç, Çağlar (2012-09-10) Mud solid and filtrate invasion are the most common causes of formation damage during overbalanced drilling (OBD), which is a method of drilling in which the wellbore pressure remains greater than formation pressure. During the past ten years, underbalanced drilling operations (UBD), which can be defined as a drilling method in which the wellbore pressure is less than formation pressure, has been growing due to their applications such as prevention of lost circulation, reduction of filtration lost in natura...

Citation Formats

İ. Durgut, M. Reed, M. G. D. Smit, and M. K. Ditlevsen, “Dynamic modeling of environmental risk associated with drilling discharges to marine sediments,” Marine Pollution Bulletin, pp. 240–249, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28562.