A multi-stage liquid co 2 Phase change composite fracturing stimulation system and method
A composite fracturing and CO2 technology, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of difficult fracturing sand-carrying, short loading time, complicated construction, etc. Improve flow conductivity and enhance the effect of driving pressure
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Embodiment 1
[0042] Such as Figure 1~4 As shown, a multistage liquid CO based 2 Composite fracturing stimulation system with phase change, including liquid CO 2 Injection unit, conventional fracturing fluid injection unit, underground blast fracturing unit and surface control unit; said liquid CO 2 The injection unit and the conventional fracturing fluid injection unit are connected to the underground blasting and fracturing unit through the fracturing string 13; the ground control unit includes a ground control device 9, and the ground control device 9 is connected to the underground blasting and fracturing unit through a cable 28. connect;
[0043] The liquid CO 2 Injection unit includes liquid CO 2 Tank 1, liquid CO 2 Pressurization equipment 2, gas-liquid separation equipment 3, high-pressure pumping equipment 4; the liquid CO 2 Tank 1, liquid CO 2 Pressure boosting equipment 2, gas-liquid separation equipment 3, and high-pressure pumping equipment 4 are connected in sequence t...
Embodiment 2
[0053] Based on multistage liquid CO as described in Example 1 2 Phase change composite fracturing stimulation system, the difference is that the multi-stage liquid CO 2 In the phase change blasting device 15, four liquid CO 2 Phase change generator. The liquid CO 2 The pipe lengths of the phase change generators are 800mm, 600mm, 400mm and 400mm respectively.
Embodiment 3
[0055] Based on multistage liquid CO as described in Example 1 2 Phase change composite fracturing stimulation system, the difference is that the multi-stage liquid CO 2 Phase change blasting device 15 is provided with 2 liquid CO 2 Phase change blasting device. The liquid CO 2 The tube lengths of the phase change blasting devices are 800mm and 600mm respectively.
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