Anti-Corrosion Cement Slurry Technology for Deep CCUS-EOR Wells in Hetao Basin
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摘要: CCUS是实现碳中和的关键技术之一，CO2的注入引起的井筒温度变化可能使水泥石产生微间隙，CO2在潮湿、高温、高压的环境中对水泥石产生长期的腐蚀，造成CO2泄露，导致储层和井筒完整性受到破坏、停产等。作为国内最深层次的CCUS-EOR工程，河套盆地面临温压变化及长期CO2腐蚀的问题，结合该地区现有成熟的固井水泥浆体系，引入防腐材料和活性材料，研发了一套具有强度高、抗CO2腐蚀能力强、微膨胀等特点的高性能防腐水泥浆体系。对比水泥石在高温湿相CO2中的长期性能，研究结果表明，优化后的水泥浆常规性能满足现场施工要求；在150℃、CO2分压40 MPa条件下，常规水泥石中加入防腐材料后的120 d腐蚀深度小于2.00 mm，抗压强度衰退约3.2%，渗透率增加14.19%，较常规水泥石大为改善；低密度水泥石的120 d腐蚀深度为2.12 mm，抗压强度衰退约4.34%，渗透率增加23.49%。该水泥浆体系在现场应用30余井次，固井质量优质率90%以上，对河套盆地的CCUS-EOR工程奠定了基础。Abstract: CCUS is one of the key technologies for achieving carbon neutrality. CO2 injection into a well causes the well temperature to change and hence produces micro fractures in the set cement. In a damp, high-temperature high-pressure environment CO2 causes a long-term corrosion to the set cement, resulting in CO2 leakage, failure of the integrity of the reservoir and the borehole, as well as production stoppage etc. As the deepest CCUS-EOR engineering in China, the Hetao Basin has long been faced with temperature and pressure changes as well as long-term CO2 corrosion. To deal with these problems, a high-performance anti-corrosion cement slurry was developed by introducing corrosion inhibitive materials and active materials into the mature cement slurries commonly used in the field operations in the basin. This new cement slurry has those characteristics such as high strength, high resistance to CO2 corrosion and micro expansion. Study results show that, compared with other cement slurries, the optimized cement slurry has long-term performance in a damp high temperature that meets the requirements of field operations. At 150℃ and CO2 partial pressure of 40 MPa, the optimized set cement treated with corrosion inhibitors has a 120-d corrosion depth less than 2.00 mm, a compressive strength that declines only by 3.2%, and a permeability that only increases by 14.19%, indicating that the performance of the set cement has been greatly improved. As with the low-density set cement, the 120-d corrosion depth is 2.12 mm, the compressive strength declines by about 4.34%, and the permeability increases by 23.49%. This new cement slurry was used 30 well-times in field operations, with more than 90% of the job quality being excellent, and this has laid the foundation for the CCUS-EOR engineering in the Hetao Basin.
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Key words:
- Well Cementing /
- CCUS Well /
- Anti-corrosion cement slurry /
- Hetao Basin
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表 1 粉煤灰和矿渣的性能
名称 ρ/
g·cm−3D50/
μmD75/
μm表面积/体积/
m2·cm−3粉煤灰 2.40 13.710 29.086 2.1675 矿渣 2.85 14.869 29.764 1.6169 
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表 2 水泥浆常规性能
配方 ρ/
g·cm−3FLAPI/
mLn K/
（Pa·sn）△ρ/
g·cm−3t稠化/min
（100℃）t终凝/
h1# 1.87 40 0.78 0.44 0 130 4.5～5.0 2# 1.87 38 0.82 0.47 0 138 4.5～5.0 3# 1.45 42 0.86 0.26 0 345 11～12 4# 1.45 44 0.83 0.37 0 324 11～12 注：流变参数测定温度为90℃。
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表 3 水泥石不同腐蚀时间下的抗压强度（CO2压力40 MPa）
配方 T养护/
℃p/MPa 7 d 14 d 30 d 60 d 90 d 120 d 2#-未腐蚀 150 40.1 45.5 50.9 52.5 53.4 54.7 2#-腐蚀 150 39.8 44.8 49.8 51.2 52.0 52.9 4#-未腐蚀 90 23.6 26.5 27.5 29.1 29.7 29.9 4#-腐蚀 90 23.3 26.0 26.8 28.2 28.5 28.6
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