Analytical models were derived in this work to predict the Maximum Permissible Pressure (MaxPP) and Minimum Permissible Pressure (MinPP) in CO2 sequestration and other fluid injection wells. The outer radius of the cement sheath should be estimated on the basis of cement placement efficiency measured by the CBL.
The West Hastings Oil Field and Oyster Bayou Oil Field in Gulf of Mexico region were analyzed to identify the potential leakage of the current CO 2 injection wells using the analytical models. Potential problems for the current wells were identified. There are potential risks for the CO 2 injection wells with relatively smaller wellbore diameter and casing diameter.
36 CO2 injection wells of the West Hastings and Oyster Bayou fields were taken as learning wells to train the neural network model, which was tested by 21 wells in the fields. The results show that the neural network model could be used for predicting the potential likelihood of leakage for CO2 injection wells, which could be an alternative and convenient way to assess the risk of leakage CO2 .
Sensitivity analysis was also performed considering cement mechanical properties, well structure and reservoir pressure. Results show that improving cement sheath mechanical properties (cement tensile strength, cement cohesive strength, internal friction angle) is not a very effective means of decreasing potential leakage of CO2 during CO2 EOR and carbon sequestration processes. The potential risk of leakage for CO2 injection wells should be decreased by maximizing the outer radius of the cement sheath and improving the cement placement efficiency. For the current CO2 EOR activities and carbon sequestration processes, the well head maximum water injection pressure could be increased as the reservoir pressure increases.
|Commitee:||Boukadi, Fathi, Lee, Jim|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 53/01M(E), Masters Abstracts International|
|Keywords:||Carbon sequestration, Cement integrity, Gulf coast fields|
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