During fracturing of low-temperature, shallow oil and gas reservoirs, it is difficult to break viscosity because of low activity of convention viscositybreaker at low temperature.
低温浅层油气井的压裂，常由于低温下常规破胶剂活性太低而破胶困难。
2
If the capsule's quality can't meet the demand, the excessive rapid release speed of the breaker would lead to the fracture fluid viscosity premature descending and inducing the failure of work.
但是如果制作胶囊破胶剂的囊壳材料不好，胶囊破胶剂释放速率过快则会使压裂液提前破胶，导致施工失败。
3
A novel water base gel breaker for fracturing fluid-EB-1 micro-capsule gel breaker is developed, to solve the difficulty of prophase viscosity reducing and gel breaking in the later period.