Enhanced interventional CT imaging of cracks in rocks during hydraulic testing

A system for high precision imaging of cracks in a hydraulic fracturing test of rock, comprising:

• an industrial x-ray CT in a laboratory setting, a high precision rotary platform and a hydraulic fracturing testing machine for rocks provided on the high precision rotary platform,
• wherein the hydraulic fracturing testing machine for rocks includes a support device, a peripheral pressurizing device, an axial pressurizing device and a high pressure water pump, wherein the support device is used for clamping a rock sample to be fractured, the peripheral pressurizing device is disposed to surround the rock sample and used for applying pressure on periphery of the rock sample, the axial pressurizing device is provided below the support device and used for applying axial pressure to the rock sample, and the high pressure water pump is used for delivering interventional contrast-enhanced agent into the rock sample to form cracks within the rock sample,
• wherein the industrial x-ray CT is used for forming a CT image of the cracks within the rock sample,
• wherein the interventional contrast-enhanced agent is a dispersed nano bismuth solution which is made by the following steps:
• stirring a dispersant with a mass fraction of 5%, a nano bismuth powder with a mass fraction of 20% and a polyethylene glycol with a mass fraction of 75% for a first time period, and vibrating them for a second time period.