In an industry often challenged by complex geology and operational limitations, Mr. Femi Ogboja, an oil and gas expert with about twenty years of experience in the oilfield services industry sheds light on innovative solutions for completion fluid design in open hole gravel packing (OHGP) operations.
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Focusing on injector wells, which support pressure maintenance for production wells, these solutions help optimize and enhance well productivity and extend the profitability of Nigeria’s oil and gas fields. These advancements have the potential to not only maximize completion efficiency but also drive industry growth and development within Nigeria.

Completion fluid design is a critical element in OHGP operations, particularly for injector wells that require meticulous fluid management. These wells are vital for reservoir management, as they help maintain pressure, enabling steady oil production and enhanced recovery rates. However, fields with injector wells face several unique challenges. In some areas, jack-up rigs with limited pit capacity add to the complexity, as they make it difficult to switch between drilling and completion fluids without risking cross-contamination. Fluid contamination can significantly impact well performance and increase operational costs, making effective fluid management indispensable.

In addressing these issues, oilfield servicing companies such as Schlumberger Nigeria advocate for a rigorous fluid management system designed to maintain optimal fluid composition and prevent contamination. Compatibility between the mud, completion fluids, and the reservoir formation is essential to prevent formation damage, which can reduce permeability and hinder production. To address this, retained permeability tests are conducted on core samples to assess how well the formation can maintain flow capacity. This is especially crucial in reservoirs where sand sections are laminated with reactive shale, which can swell or destabilize under certain fluid conditions, leading to blockages and wellbore instability. Furthermore, tectonic features, such as faults and fractured zones, often act as thief zones, drawing completion fluids away from the desired areas, increasing the risk of premature screen-outs or proppant bridging. These variables underscore the need for carefully engineered fluid designs to maintain treatment integrity.
To achieve the best outcomes in OHGP completions, Schlumberger and other oilfield leaders emphasize two primary strategies:

– Selecting the Ideal Carrier Fluid: In reservoirs with a narrow margin between pore pressure and fracture gradient, the right carrier fluid can make a significant difference. Carrier fluids are selected to minimize friction pressure during pumping and reduce the risk of proppant bridging, which is the premature accumulation of proppant particles that can block flow paths. By choosing carrier fluids with low friction and optimized viscosity, operators ensure that treatments are placed efficiently and without complications. This is crucial for well integrity and minimizes the need for re-interventions, which are both costly and time-consuming.

– Managing Reactive Shale and Sand Laminations: In formations where reactive shale is present, uniform filter cake removal becomes essential for maintaining reservoir permeability. Schlumberger achieves this by adding mudsolv agents to the gravel pack fluid, which gradually dissolves the filter cake as gravel is placed, facilitating better fluid flow and preventing losses. Moreover, the use of shunted screens—specialized screens with additional flow paths—addresses fluid losses during gravel placement. These screens ensure that the gravel is evenly packed, even in complex formations, thereby preventing treatment fluid from migrating to thief zones and maintaining a stable treatment process.

Sand control is a primary factor in prolonging the productivity and profitability of injector wells, as it minimizes the need for interventions. By carefully selecting the appropriate combination of fluids, sand, and screens, oilfield servicing companies ensure that gravel packing operations maintain well integrity, reduce intervention needs, and extend the productive lifespan of wells. This is particularly vital in fields where injector wells support pressure maintenance, which in turn sustains production from the surrounding wells. Through this approach, Schlumberger seeks to optimize injector well completions, which helps extend the well’s operational life, reduce maintenance costs, and improve long-term production efficiency. By implementing these advanced techniques, operators can achieve more reliable well performance, driving up overall field productivity and reducing the environmental impact associated with frequent interventions.

The advantages of optimizing OHGP completion fluid design extend well beyond individual well performance. Increased completion efficiency, reduced downtime, and prolonged well longevity collectively strengthen Nigeria’s oil and gas sector. As a result, operators experience higher production yields, lower operational costs, and more consistent revenue streams, which can foster greater investment in Nigeria’s oil and gas industry. Furthermore, these advancements are in line with Nigeria’s vision of positioning itself as a global leader in oil and gas production. By adopting rigorous methodologies and leveraging cutting-edge technologies, Nigeria’s energy sector can meet the challenges of complex geological formations and enhance its competitiveness on a global scale. Mr. Ogboja’s advocacy for advanced completion fluid design solutions aims to not only resolve existing operational challenges but also to pave the way for sustainable industry growth.

As Nigeria’s energy sector evolves, adopting these innovative fluid management strategies will be crucial in overcoming operational challenges and driving continued development. Schlumberger’s dedication to advancing completion fluid design in OHGP settings is poised to provide Nigeria’s oil and gas operators with the tools and strategies needed to optimize their assets fully. By maintaining well integrity, extending productivity, and reducing environmental impact, these solutions align with the industry’s goals of sustainable growth and enhanced competitiveness. As more operators adopt advanced completion techniques and strict fluid management protocols, the Nigerian oil and gas sector can look forward to a future of innovation, resilience, and prosperity. Through collaboration and ongoing investment in these areas, Nigeria’s energy industry is well-positioned to meet the challenges of tomorrow with confidence and achieve long-term success.
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