Method and system for injecting slurry using two tanks with valve timing overlap

A system for injecting slurry from a slurry source into a slurry injection site comprising:

• a first elongated tank comprising a first end having a first volume and a second end having a second volume, said first volume separated from the second volume;
• a first pipe having a first end external to the first elongated tank, said first pipe extending into the first elongated tank through the second volume so that a second end of the first pipe is disposed within the first elongated tank and ends within the first volume;
• a second elongated tank comprising a first end having a third volume and a second end having a fourth volume, said third volume separated from the fourth volume;
• a second pipe having a first end external to the second elongated tank, said second pipe extending into the second elongated tank through the fourth volume so that a second end of the second pipe is disposed within the second elongated tank and ends within the third volume;
• a plurality of slurry valves fluidically coupled to the first elongated tank and the second elongated tank, said plurality of slurry valves having a first state, a second state and an intermediate state between the first state and the second state, wherein in the first state, said plurality of slurry valves communicating high pressure slurry from the second volume to the slurry injection site and communicating low pressure slurry to the fourth volume, wherein, in the second state, said plurality of slurry valves communicating low pressure slurry to the second volume and high pressure slurry from the fourth volume to the slurry injection site and in the intermediate state communicating high pressure slurry simultaneously from the first elongated tank and the second elongated tank to the slurry injection site;
• and
• a plurality of clear fluid valves, wherein in the first state the plurality of clear fluid valves fluidically communicating high pressure clear fluid to the first volume and communicating low pressure clear fluid from the third volume and, in a second state, communicating low pressure clear fluid from the first volume and high pressure clear fluid to the third volume, and wherein, in the intermediate state, said plurality of clear fluid valves simultaneously communicating high pressure clear fluid to the first volume and the third volume.