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- Title
致密气藏压裂用防水锁剂的性能评价.
- Authors
张黄鹤; 程兴生; 李永平; 张智勇; 张大年
- Abstract
For hydraulic fracturing in low-pressure strong hydrophilic tight gas reservoirs, it is necessary to evaluate the influence of the carrier and the usage environment on the performance of the anti-water blocking agent, and to make sure the anti-water blocking agent performs its proper function. Three different types of surfactants, including fluorocarbon anionic surfactant FCY137, fluorocarbon nonionic surfactant FCF102 and self-developed nano FC-ST, had been studied to reduce surface tension and change wettability. By comparing the performance of the solution under different viscosity, APS dosage, mineralization, and pH value, the best anti-water blocking agent were selected, and the waterproof locking capability was evaluated in fracturing fluid, through self-absorbing experiments, adsorption performance experiments sur factant and penetration rate recovery experiments. The results showed that the fluorocarbon anionic surfactant FCY137, fluorocarbon nonionic surfactant FCF102 and nano FC-ST could significantly reduce the surface tension, increase contact angle, effectively reduce the capillary force under the conventional indoor conditions. The nano-FC-ST could maintain stable performance in the fracturing gel-breaking fluid under the condition that the viscosity was less than 4 mPa·s, the temperature was below 120 ℃, APS dosage was 0.5 g/L, the mineralization of water was 1× 105 mg/L and pH value was lower than 11. The performances of the anti-water blocking agent nano surfactant FC-ST met the needs of common low-pressure strong hydrophilic tight gas reservoirs, and it was better than fluorocarbon anionic surfactant FCY137 and fluorocarbon nonionic surfactant FCF102. The slick water of nano FC-ST fracturing fluid could significantly reduce the capillary force, effectively reduce water intrusion, and reduce adsorption in the near well zone. It had a permeability recovery rate of more than 50%, compared with conventional anti-water blocking agent, cleanup additive, the performance was less affected by the carrier and the environment, the performance of the water blockage prevention was remarkable.
- Subjects
SURFACE tension; CONTACT angle; GAS reservoirs; FRACTURING fluids; HYDRAULIC fracturing; WATERPROOFING; ANIONIC surfactants; NONIONIC surfactants
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p401
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.004