Patent ID: 11940592
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC G  E | IPC E  G

Claim 11:
12. A system for evaluating an integrity of a liner disposed in a wellbore that contacts a formation through a cement layer between the liner and the formation, the system comprising:
a measurement device configured to measure a property of the liner in the wellbore;
a computer processor comprising functionality for:
computing a stress on an outer boundary of the liner by an iteration procedure that implements an analytical solution of stresses on a liner-cement interface and a cement-formation interface using at least one mechanical property of the liner;
constructing a computational numerical model for simulating interactions between the liner, the cement layer and the formation;
performing a plurality of numerical simulations using the computational numerical model to calculate a magnitude and distribution of stress acting on the liner-cement interface and the cement-formation interface, wherein the numerical simulations are repeatedly performed to obtain model-predicted stresses;
comparing the model-predicted stresses on the liner-cement and cement-formation interfaces with values provided by the analytical solution until the model-predicted stresses substantially match the analytical solution;
performing the plurality of numerical simulations using actual in-situ stress to replace a mean in-situ stress on an outer boundary of the formation layer to calculate the magnitude and distribution of stress acting on the liner-cement and cement-formation interfaces using a calibrated computational mesh where the analytical solution and numerical simulation results match;
applying the calculated stresses acting on the liner to a liner integrity evaluation model to determine the integrity of the liner at a plurality of stages of the wellbore; and

determining, by the computer processor, a type of second liner based on the liner integrity evaluation model; and
performing a production operation using the wellbore and based on the type of second liner, and
wherein geometric data and at least one property of the liner are obtained using at least one of a sonic measurement, a seismic measurement, a density log and a rock mechanics testing.