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Evaluation of Caprock Integrity for Geosequestration of CO2 in Low Temperature Reservoirs

People Involved

EFENWENGBE AMINAHO

Project Description

The project aims to evaluate the effects of combing different gases with CO2 for reducing caprock embrittlement in cold temperature formation for storing CO2 in depleted oil and gas reservoirs. A promising solution to mitigate caprock embrittlement and thermal fracturing in low (cold) temperature CO2 storage sites is to initiate a chemical interaction between the caprock and CO2 by introducing certain gases that are proven friendly when in contact with CO2. This could help to reduce permeability and porosity of the caprock induced by frozen pore or connate water in low temperature formation, self-heal possible thermal fractures created in the rock due to strong temperature variations, heal caprock embrittlement resulting from the cold temperature, and increase the caprock breakthrough pressure and storage life of the sites through treatment by the chemical interactions between CO2, injected gases and the caprock. The research design is based on experimental study and numerical simulation. The main materials for this study are brittle shale rock samples, CO2, and gases that can be in association with captured CO2 (for example H2S, NO2, CH4, SO2, etc.), and water. The equipment for the experiments include gas flow rig, Oedometer cell, gas chromatography-mass spectrometer, and mechanical and petrophysical testing devices. Core samples will be cut from a single core plug to ensure they have similar original properties before experiments. After, the experiments are completed, numerical simulations will be conducted using ANSYS software. The simulation results will be validated with results from the experiments.

Project lead by University of Sheffield

Status Project Complete
Funder(s) Engineering & Physical Sciences Research Council
Value £8,000.00
Project Dates Nov 1, 2022 - Jul 31, 2023

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