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Plug removal and injection stimulation system with conjugate acid in ASP injection wells
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摘要: 由于三元复合驱中聚合物、碱的存在，易形成“胶团”状混合物，使注入井堵塞，常规化学解堵技术解堵半径小、有效期短，容易产生二次沉淀且需要返排残酸，大幅增加了措施成本及安全环保隐患。为了解决措施有效期短及残酸返排不环保的问题，研究了三元复合驱注入井共轭酸解堵增注体系。通过扫描电镜及CT三维数字岩心重构，明确了堵塞物的微观形貌及结构特征；通过无机质溶垢及离子络合评价实验，研发出1种共轭酸解堵增注体系。实验结果表明，三元复合驱注入井堵塞物是由聚合物、垢质、蜡胶质形成的多元“团状”聚集体；共轭酸解堵增注体系可实现深部解堵，无二次沉淀；岩心渗透率的恢复率较常规解堵剂提高29.2个百分点，平均措施有效期193 d，措施后无需返排，实现了三元复合驱注入井解堵措施的高效环保。Abstract: Due to the presence of polymers and alkalis in ASP flooding, it is easy to form a micelle-like mixture, which will block the injection well. The conventional chemical plug removal technology has a small effective radius and a short period of validity, it is easy to generate secondary precipitation, and the residual acid need to flow back, which greatly increases the cost of stimulations and the hidden dangers to environment. In order to solve the problems of short validity period of stimulations and the dangers of residual acid to environment when flows back, the plug removal and injection stimulation system with conjugate acid in ASP injection wells was studied. The microscopic morphology and structural characteristics of the plugs were clarified by scanning electron microscopy and CT 3D reconstruction. Through the evaluation experiments on inorganic scale dissolution and ion complexation, a plug removal and injection stimulation system with conjugated acid was developed. The experiment results show that the plugs in the ASP injection wells are multi-component clump-like aggregates formed by polymers, scales, and wax colloids. The plug removal and injection stimulation system with conjugated acid can realize deep plug removal without secondary precipitation. Compared with conventional plug removal agent, the recovery rate of core permeability after using this system was increased by 29.2%, with an average validity period of 193 days. After stimulation, there is no need for residual acid to flow back, which realizes the high efficiency and environment protection during plug removal process in ASP injection wells.
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Key words:
- ASP flooding /
- injection well /
- conjugate acid /
- plug removal /
- injection stimulation
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图 5 解堵剂不同pH值溶垢率对比曲线
Figure 5. Comparison curve of scale dissolution rate of plug removal agent with different pH values
表 1 岩心微观结构参数表
Table 1. Micro-structure parameters of core
表征参数 空白岩心 驱替后堵塞岩心 参数降幅/% 平均孔隙体积/μm3 82406 6434.8 92.2 平均配位数 2.67 1.46 45.3 平均喉道半径/μm 12.79 4.25 66.8 平均喉道体积/μm3 7400 1117 84.9 平均喉道长度/μm 12.48 7.78 37.6 
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表 2 不同质量分数共轭酸解堵剂的离子络合率
Table 2. Complexation rate of ions under conjugated acid plug removal agents with different concentrations
共轭酸解堵剂浓度/% 铁离子络合率/% 钙离子络合率/% 0.02 7.1 0.8 0.10 64 19.8 0.50 72.3 49.9 1.00 86.6 59.7
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表 3 岩心解堵实验渗透率恢复效果
Table 3. Permeability recovery effect of the core in plug removal experiment
药剂 第1段岩心
渗透率
恢复率/%第2段岩心
渗透率
恢复率/%第3段岩心
渗透率
恢复率/%平均岩心
渗透率
恢复率/%无机酸解堵剂 74.3 26.6 －9.5 31.7 共轭酸解堵剂 65.2 59.4 51.8 60.9
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表 4 某井措施前后生产数据对比
Table 4. Comparison of production data from some well before and after stimulation
注入量/m3 注母液量/m3 压力/MPa 增加注入量/m3 增加注母液量/m3 下降压力/MPa 60 20 5.6 40 17 7.6 69 23 5.9 49 20 7.3 69 23 6.2 49 20 7 69 23 6.9 49 20 6.3 69 23 7.9 49 20 5.3 69 23 8.0 49 20 5.2 69 23 8.2 49 20 5 69 23 8.2 49 20 5 69 23 8.3 49 20 4.9 69 23 8.4 49 20 4.8 69 23 8.4 49 20 4.8 69 23 8.7 49 20 4.5 69 23 8.9 49 20 4.3 68.3 22.7 7.7 48.3 19.7 5.5
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