Before we fully endulge ourselves in the social meet & greet we will welcome our two lecturers Henk van Lochem (Wintershall) and Pieter Bruijnen (TAQA). This year's lecture theme is all about:
Good bugs vs. bad bugs - Two tales on microbiological applications in the Dutch North Sea.
Henk will side with the good bugs that have the power to make & break our exploration decisions. Conversely, this talk will be followed by Pieter's plea for more awareness of microbial vandalism on production engineering matters. We hope this combination will spark some lively discussion about the merits of microbiology in the subsurface industry.
When: Monday June 18, 2018
Where: Oscar’s @ Gevers Deynootweg 205
Note: Swimming pool with changing rooms accessible
Doors open: 17:00hr; Lectures start at 18:00hr
Registration: Members €40; Students €15; Non-members €60
Microseepage Survey: Bacteria-assisted Exploration
By: Henk van Lochem, Wintershall
Abstract: In 2015 Wintershall Noordzee performed a microseepage survey to assist its exploration efforts in the southern F Quadrant of the Dutch offshore and in its Greater Ravn Area in the Danish offshore. The main targets are Upper Cretaceous Chalk oil in the Dutch licenses and Upper Jurassic Heno sandstone oil in the Danish license.
The concept of microseepage is that in every oil or gas field hydrocarbons will pass through the top seal in the form of small bubbles and migrate vertically by buoyancy to the earth’s surface. In a microseepage survey samples are taken just below the surface or sea bed to identify the occurrence or absence of microseepage above a prospect. These samples can be analyzed directly for their hydrocarbon content but also the route of microbiology can be taken. The presence and continuous supply of hydrocarbons will result in the growth of specialized bacteria capable of feeding on hydrocarbons and thus their presence is a proxy of microseepage. These specific bacteria can be identified either by metabolism experiments or by their DNA.
In the Dutch licenses the microseepage survey significantly downgraded a Chalk prospect, which was planned for eminent drilling. These results, in combination with other data, led to the cancellation of the well and the relinquishment of the prospect area. In the Danish license the survey led to the high grading of a fault block next to the producing Ravn Field and Hibonite discovery.
Microbiologically Influenced Corrosion: how microbes can impact the petroleum industry.
By: Pieter Bruijnen, TAQA
Abstract: Microbes are contained in all oilfield water systems and often cause major problems, including reservoir souring, fouling and corrosion. The impact that microbes can have on the performance of the water system has historically been misunderstood, underestimated or even denied. It is however estimated that 60% of all corrosion related issues are caused by microbes. The Rijn oilfield, offshore The Netherlands, is no exception to that: the reservoir and the tubings appeared to be affected by a microbial population consisting of more than 200 different species of bacteria and archaea. This resulted in a very strong decrease in the injectivity and in major integrity issues, with production loss and additional Capex/Opex as a direct consequence. Both classical and novel techniques like QEMSCAN and DNA based methods were combined in order to diagnose the observed problems. In this presentation it is demonstrated how the combined efforts from petroleum engineering, corrosion engineering and biotechnology had led to the conclusion that microbes play a much larger role in the petroleum industry than previously expected.
Gevers Deynootweg 205
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