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昭通页岩气井返排水化学特征及生产特征分析
Chemical characteristics of flowback water and production characteristics of Zhaotong shale gas wells
宋 煜1 刘 成1 高浩宏1 李 尚1 张盼锋1 王子云1 韩永胜
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DOI:
作者单位:1. 中国石油浙江油田公司西南采气厂 2. 中国石油浙江油田公司勘探开发一体化中心
中文关键字:晚奥陶世—早志留世 页岩气 水化学特征 返排规律 矿化度 Cl - 流压梯度 动态监测
英文关键字:Late Ordovician—Early Silurian; Shale gas; Water chemical characteristics; Flowback rules; Salinity; Cl - ; Flowing-pressure gradient; Dynamic monitoring.
中文摘要:    昭通页岩气田气井生命周期内采出水主要为压裂液的返排,投产5 年气井的压裂液返排率介于5% ~ 33%,采出水成为页岩气田开采后期制约气井低压低产阶段生产的关键因素。通过分析气田采出水的化学特征,研究其在气井返排生产过程中变化规律和成因,提出表征页岩气藏沉积和保存条件的水化学因素和及时判断页岩储层改造效果。结果表明:①昭通龙马溪组页岩是在较强蒸发浓缩作用下经过深水陆棚沉积环境形成的岩石,保留了沉积水体较高的盐度,A 区块沉积蒸发作用强,水体流动缓慢,保存条件较好,B 区块后期抬升构造运动使得保存条件变差;②通过Cl -的动态监测,研究Cl -返排变化的规律及井筒积液对生产的影响,可以及时判断页岩储层盐类离子的溶解及改造效果;③对于套压快速增加、产量快速下降、产水降低的气井,在泡排中大剂量加药,可快速清除积液,迅速恢复产能,而对于套压缓慢增加、产量缓慢减少、产水降低的气井,在连续加药后,即可达到持续排液的目的,从而使产气量逐步增加。
英文摘要:    Some water produced from gas wells in the life cycle of Zhaotong shale gasfield, Yunnan Province, mostly belongs to fracturing- fluid flowback. And for those gas wells which have been put into production for 5 years, the flowback ratio is as high as 5%-33%. So, the produced water is the key factor restricting gas wells only at low pressure and low production rate in the later development stage. Based on some chemical characteristics of produced water in this field, its origins and change rules in the flowback and production process were investigated, so as to determine the chemical factors characterizing the sedimentation and preservation and judge promptly the reconstruction effect for shale gas reservoirs. Results show that, (1) shale in Longmaxi Formation, Zhaotong gasfield, is the product of stronger evaporation and concentration under sedimentary setting of deepwater continental shelf, so depositional waterbody with higher salinity may be preserved. In a block preservation conditions are better due to strong sedimentation and evaporation as well as slow water flow. Whereas in B block, these conditions get worse due to some uplift tectonic activities in the later stage  (2) by virtue of dynamic monitoring Cl - , the change rules of Cl - flowback and the effect of wellbore accumulation on production can be investigated so as to discriminate salt ion dissolution and reservoir reconstruction; and (3) as for certain gas wells whose casing pressure rises quickly, production rate declines fast and water production rate decreases, adding a great deal of chemical into foam drainage can remove this accumulation and restore productivity rapidly. As for those whose casing pressure rises slowly, production rate declines slowly and water production rate decreases, therefore one target of continuous liquid drainage can be reached after chemical adding without interruption, so that gas production rate is increased gradually.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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