Traditional vertical drilling involves creating a single, straight path from the surface to the reservoir. Sometimes, a shallower horizontal well can be more profitable than a deeper vertical one because it drains a larger area of the reservoir.
Reservoir Economics and Depth Target Optimization
Onshore rigs, constrained by space and infrastructure, often drill shallower wells focused on onshore reservoirs. As depth increases, temperatures can exceed 150°C and pressures can surpass 10,000 psi, requiring specialized materials and technologies.
On the shallow end, vertical wells might terminate just a few hundred meters below the surface, accessing reserves trapped near the top of rock formations. The depth of an oil well is not a single number but a spectrum dictated by geology, technology, and economic strategy.
Reservoir Economics and Depth Targets for Oil Wells
In contrast, directional drilling allows the drill bit to bend and navigate horizontally through the reservoir after reaching a certain vertical depth. Conversely, in regions with ultra-deep reservoirs, the high initial cost is the only way to access the vast quantities of oil trapped beneath.
More About How deep are oil wells
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