Soluble metal fracturing ball
Comparison chart for dissolution experiment of soluble fracturing ball
Through dissolution experiment on fracturing ball by Institute of Metal Research, Chinese Academy of Sciences, the dissolution shapes of soluble fracturing ball in simulated petroleum downhole solution medium in different time periods are shown below:
• Dissolving medium: P>80 MPa in simulated petroleum downhole medium;
• Dissolving temperature: T> 150°C in simulated petroleum downhole medium;
• Dissolving time: t<120 h for single fracturing ball.
Compressive test
Diameter of the ball used is tested to be 60 mm, ball seat diameter is 56 mm and temperature is 160°C oil immersed. Testing pressure of 103 MPa is adopted to stabilize the pressure for 20 min.
In simulated petroleum downhole solution medium, dissolution rate of soluble fracturing ball in different time periods is shown below:
Domestic field application
Operating site：No. 9 Oil Recovery Plant of Daqing Oilfield
Operation effect：On July, 2015, Daqing Oilfield in Heilongjiang carried out combined construction of pumping cable perforation and soluble bridge plug.Fracturing construction of 6 segments of 5 bridge plugs was finished after three days. Soluble bridge plug was adopted for Level 1 and Level 5, while large drift diameter quick-drilling bridge plug was used for the three immediate levels.The effect is good.
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