Rotating Coiled Tubing Drilling In Tight Gas
The potential damage mechanism in tight gas reservoirs of overbalance drilling is well documented. Permeabilities of less than 5mD are common and production is limited to either high permeability streaks or fractures. Ideally the fractures are intersected at 90 degrees and provide infinite permeability access into the reservoir. Alternately the reservoirs can be expensively fractured after the drilling of the wells.

It can be seen from the figure above the advantages of underbalance drilling of reservoirs with normal to high permeability where the detrimental effects of reservoir damage are less marked. If this analogy is applied to reservoirs which have permeabilities less than 5 mD then obviously the effects will be considerably more pronounced

Rotating Coiled Tubing Drilling In Coal Bed Methane
CBM relies on the intersection of a number of well bores to sufficiently drain a seam due to the relatively low production of the wells. The RRL unit is ideally suited to this type of drilling for several reasons.

• Open hole side tracks can be initiated using the coil tubing BHA
• The wells could be drilled on balance / underbalance (well stability allowing) which would prevent fines from blocking the pores of the coal bed and inhibiting production
• EMWD could be used with the CTBHA which will remove the limit of total % of nitrogen that can be used to remain underbalance.
• A +six inch hole can be drilled which will increase the production rate from the well will bore for a single well.

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