**Integrating Analogous Estimation and Earned Value Management for Cost and Schedule Performance Evaluation of an Oil Well Workover Project**

Oil well workover projects are critical operations in the petroleum industry, as they restore well productivity, extend asset life, and maintain production efficiency. However, these projects are subject to operational uncertainties, equipment-related risks, and unexpected subsurface conditions that may affect cost and schedule performance. This study evaluates the time and cost performance of an oil well workover project by integrating Analogous Estimation during planning with Earned Value Management (EVM) during execution.

A case study was conducted using data from a real workover project with a planned duration of 30 days and a Budget at Completion (BAC) of USD 1,956,000. Historical data from similar workover operations were used to establish the initial project baseline. During execution, performance was assessed using EVM indicators, including PV, EV, AC, CV, SV, CPI, SPI, EAC, and VAC.

The results showed that an equipment-related delay reduced SPI to 0.83 and CPI to 0.74, indicating significant schedule delay and cost inefficiency. Following corrective actions, both SPI and CPI improved to 0.99 by Day 18, demonstrating substantial recovery in project performance. The findings indicate that integrating Analogous Estimation with EVM provides an effective framework for project estimation, early detection of performance deviations, and timely corrective decision-making throughout the project lifecycle.