Study and Application of an Intelligent Self-Diverting Acidizing Technology for Buried-Hill Reservoir Development
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摘要: 胜利油田潜山油藏储层埋藏深、温度高、跨度大、缝洞系统较为发育，针对酸化过程中酸液易漏失、低渗储层区域酸化程度低、施工后层间渗透率差距大的问题，通过引入羟烷基磺酸提高长链脂肪酸酰胺甜菜碱溶解性和耐温性，制得一种速溶耐温的转向剂，将该转向剂和HCl复配得到转向酸。对酸液体系配方进行了优选，研究了转向酸的各项性能。研究发现，该速溶耐温转向酸体系起黏速率快，具有良好的耐温耐剪切性能，适用于160 ℃的储层。转向酸体系在pH值3～7范围内黏度保持较好，具有良好的转向性能。双岩心酸液流动驱替实验表明，对于渗透率级差在10以下的并联岩心，酸液转向体系具有较好的均匀酸化效果。在胜利油田潜山油藏成功施工37井次，平均单井日增油量为7.3 t/d，日增液量为11.5 m3/d，控水增油效果显著。Abstract: The buried-hill reservoirs in the Shengli Oilfield have these characteristics: deep buried depths, high temperatures, large spans and highly developed fractures and vugs. In well acidizing operation, the acids are easy to be lost into the fractured formations, the reservoir formations with low permeability are poorly acidized, and after acidizing operation, different pay zones have permeabilities that are greatly different. To solve these problems, an instant high-temperature stable self-diverting agent was developed by introducing hydroxyalkyl sulfonic acid into long-chain fatty acid amide betaine to improve the solubility and temperature resistance of the latter. A self-diverting acid was then developed by mixing the self-diverting agent and HCl. The acid was carefully formulated and its properties were studied. It was found that this instant high-temperature stable self-diverting acid has the ability of fast viscosity development, and is resistant to the negative effects of high temperature and shearing. It can be used to acidize reservoir formations of 160 ℃. This self-diverting acid has satisfactory viscosity at pH values between 3 and 7, and has good diverting performance. Acid flooding displacement through double cores shows that for parallel cores with permeability difference below 10, these cores can be acidized with good uniformity. This self-diverting acid has been successfully used on 37 wells in the buried-hill reservoir, with average oil production increase of 7.3 t/d per well, and average liquid production increase of 11.5 m3/d per well, showing good performance in oil production enhancement and water production control.
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Key words:
- Buried-hill reservoir /
- Acidize /
- Self-diverting /
- Amphoteric surfactant
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表 1 酸液体系对碳酸盐岩岩心粉的溶蚀率
HK-3/
%岩心粉质量/g 溶蚀率/
%溶蚀率平均值/
%反应前 反应后 0 1.0011 0.0832 91.69 92.25 1.0016 0.0721 92.81 8 1.0016 0.2795 72.09 70.84 1.0017 0.3046 69.59 9 1.0011 0.3357 66.47 67.09 1.0019 0.3236 67.71 10 1.0009 0.4316 56.88 55.96 1.0009 0.4500 55.04 
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表 2 酸液体系在不同条件下的平均腐蚀速率（160 ℃）
钢片 转速/r·min−1 腐蚀前质量/g 腐蚀后质量/g 腐蚀质量/g 腐蚀速率/g/(m2·h) 平均腐蚀速率/g/(m2·h) N80 0 11.0351 10.8216 0.2135 39.2 39.5 11.2633 11.0476 0.2157 39.7 80 11.3183 11.2103 0.1080 19.9 20.4 11.3884 11.2745 0.1139 20.9 160 11.4186 11.3011 0.1175 21.6 21.9 11.5079 11.3871 0.1208 22.2 P110 0 11.4742 11.2855 0.1887 34.7 35.1 11.1886 10.9962 0.1924 35.4
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表 3 并联岩心考察转向酸的性能
渗透率级差 岩心编号 起始渗透率/mD 酸化后渗透率/mD 酸蚀引孔穿透情况 3 1# 39 酸液穿透 完全穿透 2# 91 酸液穿透 完全穿透 5 3# 30 210 穿透50% 4# 152 酸液穿透 完全穿透 10 5# 20 21 穿透率为0 6# 210 酸液穿透 完全穿透
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表 4 胜利油田河口潜山油藏近3年增产井的酸化措施效果统计
年度 实施井次 酸化前产能 酸化后产能 累计增产原油/
t产液量/m3·d−1 产油量/t·d−1 含水率/% 产液量/m3·d−1 产油量/t·d−1 含水率/% 2019 11 41.2 13.2 68.0 250.3 135.5 45.9 19 081.9 2020 13 45.2 4.3 90.5 194.1 59.8 69.2 10 466.8 2021 13 122.2 6.1 95.0 190.1 97.5 48.7 8210.5
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