Induce Fracture Pneumatic Fracture Granite

In this pioneering study injection induced fracture propagation tests were performed on the single flawed and double flawed granite samples receptivity.

Induce fracture pneumatic fracture granite.

Formation fractures occur when the injection is performed at a pressure exceeding the in situ stresses and fissure propagation occurs. Petropedia explains induced fracture induced fracturing is performed with the help of hydraulic fracturing technique in shale formations where the hydrocarbons are tightly packed between the non permeable rocks under great pressure and. 1b in two cylindrical core samples without visible cracks on the sample surfaces. Line rocks such as granite basalt tuffs etc have been suggested as suitable sites for the construction of nuclear waste repositories in many countries.

Pdf on dec 19 2018 y l. Thereby creating fractures or fissures in soil or rock formations. Pneumatic fracturing or pneumatic inclusion propagation pip enhances the permeability of geologic formations by injecting high pressure air. We investigate mixed mode fracture initiation and propagation in experimentally deformed granite and sandstone.

Pneumatic nitrogen injection system source navfac pneumatic fracturing uses air or other gas to induce and propagate fracturing. Bukit timah granite is a triassic igneous rock sourced from the central region of singapore island. Hydraulic fracturing is used to induce the fractures in the formation so as to enhance oil or gas production. These geologic for mations however often contain interconnected fractures or fault zones on a continuum of scales bonnet et al 2001 caused by cooling and or tectonic processes.

The mineralogical mechanical and hydraulic properties of this granite can be found in ji et al. The observations in the single flawed sample sw 1 is used to prove that the pre existing fractures can be propagated. Typically pneumatic fracturing is used in formations where the fractures will remain open for a long time without support hence propping agents to hold fractures open are not commonly employed. Fracturing experiments on shale and granite using fluids of different viscosities show that sc co 2 can induce a shear dominant fracture with more branches and generate cracks extending more.

We performed a series of asymmetric loading tests to induce fractures in cylindrical specimens at confining pressures up to 20 mpa. To investigate how the viscosity of the fracturing fluid affects fracture propagation hydraulic fracturing experiments using three fluids with different viscosities supercritical co2 water and viscous oil under the true tri axial condition were conducted on anisotropic granite specimens and then the induced fractures were microscopically observed via a fluorescent method. Loading was controlled using acoustic emission ae feedback control which allows studying quasi static fracture propagation for several hours.