Study and Application of Low Penetration Cement Slurry for Cementing CCUS Wells in Chuanyu Area
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摘要: 针对川渝地区固井水泥环在酸性环境下易发生腐蚀劣化及密封失效等难题，研发了一种兼具成膜吸附与微观结构调控功能的抗腐蚀材料DST，基于此构建了低渗透防腐水泥浆体系。不同于传统防腐材料，DST能够诱导腐蚀水化产物由疏松结构转变为致密的球状碳酸钙堆积，从而阻断腐蚀介质的深层渗透。基于典型井底温压条件（80 ℃/40 MPa），开展室内酸性腐蚀实验与现场应用。结果表明，水泥石在腐蚀28 d后抗压强度较未腐蚀水泥石仅降低5%，渗透率虽有轻微增长，但最终值低于4×10−5 μm2，主要孔径维持在10～90 nm的无害和少害孔范围内，微观形貌未观测到贯通孔隙和松散结构。该体系在川渝地区某CCUS井应用后，一、二界面胶结质量合格率均超94%，在后续超300 d注采作业中，井筒环空未监测到异常带压和CO2泄露现象。该研究开发的防腐关键材料DST和构建的低渗透防腐水泥浆体系，显著提升了CCUS井筒长效密封能力，为CO2埋存奠定了坚实的固井技术支撑。Abstract: Well cementing in the Chuanyu area (Sichuan and Chongqing) is faced with corrosion, deterioration and failure of sealing of cement sheath in acidic condition. To address these issues, a corrosion-resistant material DST with both filming adsorption and microstructure regulation and control functions was developed, and with DST, a low-permeability corrosion-resistant cement slurry was formulated. Different from conventional corrosion-resistant materials, DST can induce corrosive hydration products to transform from a loose structure to a dense spherical calcium carbonate packing, thereby blocking the deep penetration of the corrosive media. Based on the typical bottomhole temperature and pressure conditions (80 ℃/40 MPa), laboratory acid corrosion experiment and field application were conducted. The results show that after being corroded for 28 days, the compressive strength of the set cement is only reduced by 5%. The permeability of the set cement, although slightly increased, is finally lower than 4 × 10−5 μm2. The diameters of the main pores are kept at 10 – 90 nm, which are harmless or only slightly harmful, and no connected pores and loose structures are observed in the micromorphology of the set cement. This cement slurry has been applied in cementing a CCUS well in the Chuanyu area, and the first and the second bonding interfaces of the cement sheath are qualified at a rate exceeding 94%. In subsequent 300-day injection and production operations, no abnormal sustained pressure and CO2 leaking were monitored. The key corrosion-resistant material DST developed in this research and the low-permeability corrosion-resistant cement slurry significantly improve the long-term sealing of the CCUS wellbore and lay a solid foundation for cementing CO2 storage wells.
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Key words:
- CCUS /
- CO2 corrosion /
- Well cementing /
- Cement slurry /
- Low-permeability /
- Pore size distribution /
- Sealing integrity
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