Apparatus and method for high pressure abrasive fluid injection

1. A system for injecting high pressure abrasive fluid into a wellbore, comprising:

an abrasives hopper;

a slurry tank connected to the abrasives hopper;

a low pressure abrasive pump connected to the slurry tank, wherein the low pressure abrasive pump comprises abrasive-resistant materials;

a slurry circulation line for circulating slurry from the slurry tank through the low pressure abrasive pump past the abrasive hopper and back to the slurry tank;

a first high pressure vessel connected to the low pressure pump through a first high pressure valve;

a high pressure non-abrasive pump connected to the first high pressure vessel through a second high pressure valve, wherein the high pressure non-abrasive pump is configured to pressurize the first high pressure vessel; and

a wellbore connected to the first high pressure vessel through a third high pressure valve.

2. The system of claim 1 , further comprising:

a second high pressure vessel connected through a fourth high pressure valve to the low pressure abrasive pump and to the high pressure non-abrasive pump and connected through a fifth high pressure valve to the wellbore.

3. The system of claim 1 , further comprising:

a water supply tank connected to a line connecting the high pressure non-abrasive pump.

4. The apparatus of claim 3 , further comprising:

a flow restrictor connected to the high pressure non-abrasive pump and the water supply tank.

5. The apparatus of claim 1 , wherein the first high pressure valve comprises a dump valve.

6. The apparatus of claim 1 , further comprising:

a pressure pulse damper connected to a line connecting the high pressure non-abrasive pump and the first high pressure valve; and

a pressure sensor connected to the pressure pulse damper.

7. The apparatus of claim 1 , further comprising:

a fluid discharge hose connecting the abrasives hopper to the slurry tank.

8. A method for injecting high pressure abrasive fluid into a well bore, comprising:

mixing low pressure abrasive slurry by circulating the abrasive slurry from a slurry tank, through a low pressure abrasive pump, by an abrasive hopper, and back to the slurry tank, wherein the low pressure abrasive pump comprises abrasive-resistant materials;

circulating the low pressure abrasive slurry from the slurry tank, through the low pressure abrasive pump, through a second high pressure valve, through a first high pressure vessel, through a third high pressure valve, and back to the slurry tank;

sending high pressure non-abrasive fluid by a high pressure non-abrasive pump through a first high pressure valve to the first high pressure vessel;

opening the second high pressure valve to allow abrasive slurry to fill the first high pressure vessel; and

actuating the first, second, and third high pressure valves to allow the high pressure non-abrasive fluid to push the abrasive slurry through the first high pressure vessel to a wellbore.

9. The method of claim 8 , further comprising:

actuating the first, second, and third high pressure valves to allow more non-abrasive fluid

to go directly to the wellbore while the high pressure non-abrasive pump refills the first high pressure vessel through the first high pressure valve.

10. The method of claim 8 , further comprising:

actuating the first, second, and third high pressure valves to allow abrasive slurry to fill a second high pressure vessel through a fourth high pressure valve; and

actuating the first, second, third, and fourth high pressure valves to allow the high pressure

non-abrasive fluid to push the abrasive slurry through the second high pressure vessel and a fifth high pressure valve to the wellbore, while the non-abrasive high pressure pump refills the first high pressure vessel through the first and second high pressure valves.

11. The method of claim 8 , further comprising:

adding guar powder to the slurry tank to gel the abrasive fluid.

12. The method of claim 8 , further comprising:

adding air to the slurry tank.