Schlumberger

The First Well

Planning and designing exploration wells

Designing the first exploration well requires well defined objectives and detailed planning, in particular identifying and managing the drilling risks. Drilling this well will test the effectiveness of the petroleum system and the viability of the prospect.

Choosing the optimum well trajectory includes a robust assessment of the pore pressures to be encountered. Optimum mud weights and drilling fluid systems need to be specified. During and after drilling critical data for formation and fluids evaluation must be acquired based on an appropriate well logging program.

Direct measurements of the reservoir rocks and fluid content provide a key part of the information  to be collected from the first well.

Once drilled and completed, the well needs to be flowed in order to evaluate productivity, fluid properties, composition, flow, pressure and temperature, and the associated costs and hazards.

Drilling The First Well

Diligent planning for the first well involves well trajectory design in combination with a prediction of pore pressures in order to drill safely and efficiently. Measurements while drilling are used for continuous forward planning.

The First Formation Evaluation

First access to the reservoir formation provides crucial information with which to gain a detailed understanding of rock and fluid characteristics.

Reservoir Evaluation

Assessing the presence of reservoir zones, their pressures and hydrocarbon volumes is necessary for further economic planning.

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