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Prediction of the Calcium Sulfate Deposition under Reservoir Conditions for Water Injection ProcessNormal access

Authors: A. Khormali, M.F. Ghasemi, D.G. Petrakov and H. Jafarpour
Event name: GeoBaikal 2016
Session: Разработка месторождений и повышение нефтеотдачи
Publication date: 22 August 2016
DOI: 10.3997/2214-4609.201601701
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 981.95Kb )
Price: € 20

Inorganic salt deposits on the underground equipment and in the formation are one of the most common complications in the artificial oil production from the reservoir. Prediction of the scaling intensity in the well and the reservoir is the starting point for planning to reduce equipment failures and formation damage due to the salt precipitation during water injection into the reservoirs in the pressure maintenance system. In this work, two different synthetic injection and formation waters were prepared to study the effect of different parameters on the scaling prediction of calcium sulfate. The following parameters have been investigated to obtain the scaling tendency, which gives the possibility of the salt formation: temperature, pressure and mixing ratio of injection and formation waters. The results of study showed that these parameters had a great effect on the scaling tendency of calcium sulfate and amount of its precipitation. Method of scaling prediction using the saturation index and the algorithm for selecting protection technology, which were realized in the used program, can be successfully used in the risk analysis of the salt deposition and planning for their prevention in the wells and reservoirs.

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