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Summary: The control of biofouling and sulphate-reducing bacteria (SRB) is essential for the long term performance of the water flood operation, in terms of plugging and souring. SRB are the prime cause of oilfield souring and their growth and activity within an oil reservoir are the subject of the souring prediction tool 'Dynamic TVS'.
The Dynamic TVS software package was developed to predict a reservoir's propensity to sour in advance of well completion. The H2S profiles generated provide a future view of sour gas content for any fluid phase at any PVT conditions in the system. |
Company
Water Injection
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Patrick Laycock of UMIST and Bob Eden have worked in the field of water injection and souring since 1985. Rawwater Engineering can develop an Operator's management strategy on any aspect of the subject. The first stage is the souring gas prediction using the Dynamic TVS software package.
The Dynamic TVS software package was developed to predict a reservoir's propensity to sour in advance of well completion. The H2S profiles generated provide a future view of sour gas content for any fluid phase at any PVT conditions in the system.
The Dynamic TVS predictions have been used specifically for:
- Assessment of health and safety risks and environmental risk management
- Determination as to whether the wellstream would stay within existing limits of the metallurgical specification to continue safe operation
- The management of waterflood treatments
- Decision making on use or otherwise of desulphation plant
- Sour service materials specification
- Separator management
A detailed questionnaire with explanatory notes has been prepared. This questionnaire addresses water physiochemistry, including pressure, filtration and biocidal treatment. In the absence of such data, Rawwater Engineering will advise on appropriate substitute values and justifications.
Prior to completing this questionnaire Rawwater Engineering will discuss with you what is required in terms of input data to ensure that the correct injector/producer pair conditions are selected.
All the predictions are developed from either historical matching or best guesses from the operator and bounded by 'what if?' sensitivities. When the field has produced real data the outputs are suitable for history matching purposes and QA of the prediction.
To date, we have predicted the H2S profile for around 28 wells. Those Rawwater Engineering can summarise, from either public domain information or because wells are no longer commercially sensitive, are as follows:
- Amerada Hess, Scott Correctly predicted severe souring
- BP, Magnus Correctly predicted sweet operation
- Phillips, Maureen Correctly predicted sweet operation
- Statoil, Gullfax Correctly predicted severe souring
- OMV, Metzen Correctly predicted and implemented desouring strategy
Deliverables
The deliverables will include:
- H2S profile for the selected producer in each fluid phase over the production life of the producer under selected PVT conditions.
- Four sensitivities
- A hard copy of the report including a narrative explaining the predictions together with supporting published literature
- An electronic copy of the above report
The deliverables exclude strategic planning in the matters of application of those predictions. These issues will be raised only in the event that souring is predicted.
Costs and Schedule
The cost of the desktop study will be given on application. The prediction will be delivered within 28 working days of the supply of all the necessary input data. |
