10136 Development of Low Corrosive Environmental Friendly Calcium Carbonate Scale Dissolver for HTHP Wells

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Product Number: 51300-10136-SG

ISBN: 10136 2010 CP

Author: Tao Chen, Ping Chen, Harry Montgomerie, Bjorn Juliussen, Torstein Haaland and Thomas Hagen

Publication Date: 2010

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Calcium carbonate is one of the most common scales found in oilfields. Scale inhibitor treatment is a traditional method to control the calcium carbonate deposition. Scale acid treatment is another common way to remove/dissolve carbonate scale. However, high corrosion rate of scale dissolvers at high temperature and the environmental requirement for scale dissolvers have been two major challenges in the development of scale dissolvers and applications under HTHP conditions.

In this paper, a low corrosive environmental friendly calcium carbonate scale dissolver has been developed to provide a treatment to remove calcium carbonate scale formed in HTHP wells. The characteristics of this product are as following:

· Low corrosiveness at temperatures up to 170°C. General corrosion is low and no pitting corrosion observed.

· Yellow Y1 environmentally acceptable chemical in Norway.

· Both the aged (170°C) and non-aged samples showed similar CaCO3 dissolving capacity.

· A high dissolving rate in the initial stages of scale dissolution.

· No re-precipitation risk after cooling.

In addition, a winterized version of this dissolver has been developed. The performance tests have been carried out and reported as well.

Key words: scale dissolver, calcium carbonate, scale, HTHP well