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Low-sulfate seawater injection into oil reservoir to avoid scaling problem

机译:将低硫酸盐海水注入油藏以避免结垢问题

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摘要

This study presents the results of laboratory experiments carried out to investigate the formation of calcium, strontium and barium sulfates from mixing Angsi seawater or low sulfate seawater with the following sulfate contents (75, 50, 25, 5 and 1%) and formation water contain high concentration of calcium, strontium and barium ions at various temperatures (40-90°C) and atmospheric pressure. The knowledge of solubility of common oil field scale formation and how their solubilities are affected by changes in salinity and temperatures is also studied. Results show a large of precipitation occurred in all jars containing seawater while the amount of precipitation decreased when the low sulfate seawater was used. At higher temperatures the mass of precipitation of CaSO4 and SrSO4 scales increases and the mass of precipitation of BaSO4 scale decreases since the solubilities of CaSO4 and SrSO4 scales decreases and the solubility of BaSO4 increases with increasing temperature. It can be concluded that even at sulfate content of 1% there may still be a scaling problem.
机译:这项研究提供了实验室实验的结果,以研究将具有以下硫酸盐含量(75%,50%,25%,5%和1%)的Angsi海水或低硫酸盐海水混合形成钙,锶和钡的硫酸盐在各种温度(40-90°C)和大气压下的高浓度钙,锶和钡离子。还研究了常见油田结垢形成的溶解度知识以及盐度和温度变化如何影响其溶解度。结果表明,在所有装有海水的广口瓶中都出现大量沉淀,而当使用低硫酸盐海水时,沉淀量减少。在较高温度下,CaSO4和SrSO4氧化皮的沉淀质量增加,BaSO4氧化皮的沉淀质量降低,这是因为CaSO4和SrSO4氧化皮的溶解度降低,BaSO4的溶解度随温度升高而增加。可以得出结论,即使硫酸盐含量为1%,也可能存在结垢问题。

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