Drilling underbalanced brings unique problems, but overcoming them can result in a successful well not attainable with traditional drilling techniques.There are many locations worldwide where drilling cost reduction or production improvement is likely to result through application of directional underbalanced drilling (UBD). The main benefit of underbalanced drilling is the minimization of formation invasion related problems. Because the majority of hydrocarbons today are found in existing fields with depleting pressures, or in complex and low quality reservoirs, the economical use of underbalanced drilling has become more popular and the routine...

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