Slow release breaking method for surfactant fracturing fluids
A surfactant and fracturing fluid technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc. The effect of scheduling cycle, reducing damage, and reducing development cost
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Embodiment 1
[0042] The block where a certain oil well (1#) is located has poor physical properties, and the average daily liquid production of single well test drainage is less than 10m 3 , 9 surfactant fracturing fluid tests have been completed in the early stage, of which 7 wells have gel-carrying sand back after blowing out after pressure, and the viscosity is still greater than 5mPa.s after blowing out for 1 hour. There are 7 shifts in the swabbing cycle, and the average flowback rate is 85.7%.
[0043] On September 20, 2010, 12m of surfactant fracturing fluid main agent was prepared on site 3 , clear water 120m 3 , Capsule slow-release gel breaker 500kg, solid particle slow-release gel breaker 80kg, high-viscosity liquid slow-release gel breaker 300kg. Start pumping pre-fluid (displacement 1.4m 3 / min), manually add capsule slow-release gel breaker from the sand mixer at a rate of 5kg / min, and at the same time add solid particles from the mixer at a rate of 4kg / min during the enti...
Embodiment 2
[0045] The block where a certain oil well (2#) is located has poor physical properties, and the average daily fluid production of single well test drainage is less than 10m 3 , 9 surfactant fracturing fluid tests have been completed in the early stage, of which 7 wells have gel-carrying sand back after blowing out after pressure, and the viscosity is still greater than 5mPa.s after blowing out for 1 hour. There are 7 shifts in the swabbing cycle, and the average flowback rate is 85.7%.
[0046] On September 26, 2010, 10m of surfactant fracturing fluid main agent was prepared on site 3 , clear water 100m 3 , Capsule slow-release gel breaker 450kg, solid particle slow-release gel breaker 60kg, high-viscosity liquid slow-release gel breaker 200kg. Start pumping pre-fluid (displacement 1.2m 3 / min), artificially add capsule slow-release gel breaker from the sand mixer at a rate of 5.5kg / min, and manually add solid particles from the sand mixer at a rate of 3kg / min throughout th...
Embodiment 3
[0048] The block where a well (3#) is located has poor physical properties, and the average daily fluid production of a single well test drainage is less than 10m 3 , 9 surfactant fracturing fluid tests have been completed in the early stage, of which 7 wells have gel-carrying sand back after blowing out after pressure, and the viscosity is still greater than 5mPa.s after blowing out for 1 hour. There are 7 shifts in the swabbing cycle, and the average flowback rate is 85.7%.
[0049]On September 28, 2010, 6m of surfactant fracturing fluid main agent was prepared on site 3 , clear water 60m 3 , capsule sustained-release gel breaker 300kg. 45kg of slow-release gel breaker for solid particles, 150kg of slow-release gel breaker for high-viscosity liquid. Start pumping pre-fluid (displacement 1.6m 3 After that, manually add capsule slow-release gel breaker from the sand mixer at a rate of 6kg / min, and at the same time add solid particles from the mixer at a rate of 4kg / min dur...
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