This paper examines the relationship between crude-oil production in the Niger Delta and economic development in Rivers State from 2000–2025. Using secondary time-series data and published reports, the study traces production trends, security shocks, environmental damages, and policy responses, and evaluates how those dynamics have affected regional development indicators (public revenue flows, infrastructure provisioning, employment, and human development outcomes). The analysis synthesizes national production statistics, environmental assessments, media and industry reporting, and academic studies to show that (a) oil production in Nigeria and in the Niger Delta basin that supplies much of it experienced marked volatility during 2000–2025; (b) production shortfalls driven by vandalism, theft and militancy reduced expected fiscal flows and constrained state-level development; and (c) chronic environmental degradation from spills and gas flaring has undermined local livelihoods, offsetting some gains from oil rents. The paper ends with policy recommendations focusing on security and anti-theft measures, environmental remediation, revenue transparency, and local development investments in Rivers State. Key sources include national production series (EIA/CEIC), UNEP environmental assessments, and contemporary coverage of anti-theft operations.