Study on High Temperature Completion Stimulation Fluid for Offshore Low Porosity Low Permeability Gas Field
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摘要: 低孔低渗气田的主要产能释放措施是酸化和压裂,而海上油气田受完井方式、作业成本、安全要求等因素制约,储层改造措施技术有限。为解决文昌低孔低渗高温气田产能释放问题,通过对酸化以及储层保护等多方面研究,分别构建了具有酸化、破胶、扩孔和防水锁等功效的适合文昌气田定向井和水平井的新型完井产能释放液体系,体系酸溶率7.70%~12.99%,深部酸化能力强,可有效降低毛管压力和增加助排性,系列流体污染后渗透率恢复值大于90%,且二次污染后渗透率恢复值仍保持稳定,具有良好的储层改造和保护效果。完井产能释放液体系在文昌气田应用后,各井清井测试产能平均达到配产产量的1.7倍,充分释放了低孔低渗高温气田的产能需求,为类似海上低渗气田的开发提供了借鉴。Abstract: Reservoir acidization and fracturing are two common stimulation measures used to enhance the productivity of low porosity low permeability wells. Offshore gas fields have less reservoir stimulation measures because of limitations in well completion method, job cost and safety. To improve the productivity of the high temperature low porosity low permeability gas field in Wenchang, a new completion stimulation fluid suitable for directional well and horizontal well has been developed. This stimulation fluid has the abilities of acidization, gel breaking, porosity improvement and anti-water blocking. Percent acid solubility of the stimulation fluid for formation solids is between 7.70% and 12.99%. This stimulation fluid is capable of in-depth acidizing and effectively reducing capillary pressure and enhancing cleanup of acidizing residues. Laboratory experimental results showed that the permeability of a rock sample contaminated by the stimulation fluid was resumed by more than 90%, and the permeability recovery of the rock sample was steady after second contamination by the stimulation fluid. Application of the stimulation fluid in Wenchang gas field gave birth to a production rate that is 1.7 times of the allocated production rate of each well, substantially releasing the productivity of the high temperature low porosity low permeability wells and providing a clue for the development of similar low permeability offshore gas fields.
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Key words:
- Low porosity /
- High temperature /
- Productivity releasing /
- Acid solubility /
- Reservoir protection
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