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Geochemical characteristics of produced water from coalbed methane wells and its influence on productivity in Laochang Coalfield, China
Open Geosciences ( IF 2 ) Pub Date : 2020-10-22 , DOI: 10.1515/geo-2020-0124
Mingyang Du 1, 2 , Caifang Wu 1, 2 , He Zhou 1, 2 , Shasha Zhang 1, 2 , Erchao Zhang 1, 2
Affiliation  

Abstract The water produced from the coalbed methane (CBM) wells contains abundant geochemical information, which is of great significance in evaluating the productivity of these wells. Based on the data of water produced from five CBM wells, geochemical characteristics of the produced water and its influence on the productivity of the wells are analyzed in Laochang Block. The results show that with the increase in the produced water of the five wells, δD and δ18O show a downward trend in general, reflecting that the influence of coal seams and surrounding rock on the produced water is weak, while the water–rock interaction of the Y-3 and Y-5 wells is more stable than that of the Y-1, Y-2, and Y-4 wells. Combining the water production characteristics of the Y-3 and Y-5 wells with better drainage and recovery effects, it is proposed that 0 ≤ σ M < 0.3 and 0 ≤ σ Y < 600 or 0.7 < σ M < 0.8 and 1,200 < σ Y < 1,300, and the fluctuation ranges of Ca2+, Mg2+, HCO3 − and SO4 2− can provide a basis for quantitative characterization and evaluation of CBM well production.

中文翻译:

老昌煤田煤层气井采出水地球化学特征及其对产能的影响

摘要 煤层气(CBM)井产出水含有丰富的地球化学信息,对评价这些井的产能具有重要意义。以5口煤层气井采出水数据为基础,分析了老厂区块采出水地球化学特征及其对井产能的影响。结果表明,随着5口井采出水量的增加,δD和δ18O总体呈下降趋势,反映煤层及围岩对采出水的影响较弱,而Y-3和Y-5井比Y-1、Y-2和Y-4井更稳定。结合Y-3和Y-5井的产水特点,排水和采收效果更好,
更新日期:2020-10-22
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