SAND PRODUCTION MANAGEMENT IN OIL AND GAS WELLS: A CASE STUDY OF NIGER DELTA ONSHORE OIL AND GAS

Sand production remains a significant operational challenge in oil and gas well operations, particularly in unconsolidated and weakly consolidated sandstone reservoirs commonly found in onshore petroleum fields. The uncontrolled movement of formation sand into the wellbore during hydrocarbon production poses serious technical, economic, safety, and environmental concerns, often leading to equipment erosion, flow restrictions, increased non-productive time, and, in severe cases, premature well abandonment. This study investigates sand production in oil and gas wells by examining its underlying causes and mechanisms, assessing its operational impacts, and evaluating effective management and control strategies applicable to petroleum reservoirs, with specific emphasis on the Nigerian oil and gas industry. The study adopts a qualitative and analytical research approach based on an extensive review of existing literature, industry reports, and documented field case studies related to sand production and sand control practices. Key factors influencing sand production, including pressure drawdown, high production rates, reservoir depletion, water breakthrough, grain size distribution, and formation cementation strength, are critically analyzed. Various sand control techniques, such as gravel packing, stand-alone screens, chemical consolidation, and production rate control, are reviewed and comparatively evaluated in terms of their applicability, effectiveness, and limitations in unconsolidated sandstone formations. Findings from the reviewed studies indicate that sand production is primarily triggered when the mechanical stresses induced by fluid flow exceed the formation’s compressive strength, resulting in grain detachment and migration into the wellbore. The study further reveals that sand production significantly increases operational costs due to equipment damage, frequent well interventions, and deferred production, while also posing safety risks and environmental concerns. Mechanical sand control methods, particularly gravel packing and screen-based completions, were found to provide more reliable and long-term sand control in highly unconsolidated formations when appropriately designed and implemented. Chemical consolidation methods, although useful in specific conditions, showed variable performance depending on formation properties and operational conditions. The study concludes that effective sand production management requires a proactive and integrated approach that combines thorough reservoir characterization, appropriate selection of sand control techniques, controlled production strategies, and continuous monitoring throughout the well’s life cycle. Proper sand management not only enhances well integrity and production sustainability but also reduces operational risks, minimizes environmental impact, and improves the overall economic performance of oil and gas projects. Consequently, the implementation of well-tailored sand control strategies is essential for achieving safe, efficient, and long-term hydrocarbon production in sandstone reservoirs