|WP 6 Operations (INJECT)|
CO2 will be brought into the reservoirs by wells and “good” flow properties in the near well area are important for successful injection. The aim of work package 6 INJECT is the injectivity of the reservoir.
The reservoir has initially (before operations) a given porosity, permeability and a set of fractures, which will most likely change as a result of CO2 injection. Formation water rich in dissolved CO2 becomes a highly reactive fluid, which may dissolve reservoir rocks and engineering material such as concrete and steel. The injection of CO2 with a large rate may lead to pressure build-up, and an increasing fluid pressre can lead to hydraulic fracturing of the formation. If the fractures are strata bound they may enhance the injectivity, but in case they go through the sealing layers it may lead to leakage of CO2. The focus of WP6 is to understand the geochemical and geomechanical consequences of CO2 injection, and to suggest a work flow for CO2 injection management.
WP6 is divided into four tasks:
Task 6.1: Evaluation of reservoir properties of DeGeerdalen Fm and validity of the LYB PILOT_L
Task 6.2: Develop numerical tools for modelling of near well pressure and deformation
Task 6.3: Workflow for injection well monitoring.
Task 6.4 Experimental data and models for near well flow and reactions.
The figure shows the stress field around a hydraulic fracture. Notice that there is a stress enhancement at the tip of the fractures. That is why the tips are the most likely place for fracture propagation. Figure Courtesy of Magnus Wangen, Insitute of Energytechnology
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