Abstract

A new stimulation method takes advantage of the micro-tectonic forces created during a fracturing process to temporarily modify the anisotropical landscape within the area. During this brief temporal window, a secondary fracture can be created in a completely different direction, resulting in much higher probability of maximized well production. Such methods warrant the availability of data related to the dynamic behavior of rocks. Such data includes rock compression, slip data between rock layers, and the amount of energy stored within such slip planes, all recorded as a function of time.

To offer this capability, a new testing device was designed specifically for this purpose. The test fixture accepts three layers of rocks, which could be the same or different type rocks (depending on requirements), which are then stressed and pressurized gradually to represent the real stresses and pore pressures inside a formation. Rock compression to mimic a fracture stimulation treatment is simulated by pressurizing one side of one of the rock layers. Accurate linear displacement sensors are used to sense rock layer motion; hence, compression and slip data can be recorded. Additionally, the device also records micro-seismic signals, which are accurately triangulated to locate the tip of the slip, to further characterize the unique behavior of the rock during stimulation.

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