Evaluating Factors Controlling Damage and Productivity in by Nick Bahrami

By Nick Bahrami

Tight gasoline reservoirs have very low permeability and porosity, which can't be produced at low-priced circulate charges except the good is successfully inspired and accomplished utilizing complicated and optimized applied sciences. low-budget construction at the foundation of tight fuel reservoirs is hard often, not just as a result of their very low permeability but additionally to a number of assorted different types of formation harm that could happen in the course of drilling, of completion, stimulation, and construction operations.

This learn demonstrates intimately the consequences of alternative good and reservoir static and dynamic parameters that impression harm mechanisms and good productiveness in tight fuel reservoirs. Geomechanics, petrophysics, construction and reservoir engineering services for reservoir characterization is mixed with a reservoir simulation procedure and center research experiments to appreciate the optimal procedure for tight gasoline improvement, supplying stronger good productiveness and fuel recovery.

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In other words, in the case of single hydraulic fracturing, the well productivity may not be improved noticeably if water blocking damage is significant. For both damaged and non-damaged formation, the models with five hydraulic fractures provided significantly better productivity. Fig. 7 Damage to Natural Fractures The reservoir scale simulation model is run in the cases where the well intersects no natural fractures, the well intersects open natural fractures, and the well intersects the natural fractures that have been plugged at the well location.

The simulation results for the effect of initial water saturation are shown in Fig. 8, which indicate significant effect of Swi on well productivity. For all the cases, sub-normal Swi provided significantly higher gas production rate. Fig. 1 Simulation results for injected water and recovered water Simulation results for Scenarios Cumulative water production/injection Injected Water (bbl) A1, normal Swi, no frac No water invasion prior A2, normal Swi, 1 frac to gas production A3, normal Swi, 5 fracs B1, sub-normal Swi, no frac B2, sub-normal Swi, 1 frac B3, sub-normal Swi, 5 fracs A4, normal Swi, no frac 2000 bbl/d water injection prior to gas production A5, normal Swi, 1 frac A6, normal Swi, 5 fracs B4, sub-normal Swi, no frac B5, sub-normal Swi, 1 frac B6, sub-normal Swi, 5 fracs 27 Cumulative Produced Water (bbl) – – 1829 1872 2046 4443 829 911 1164 134 4472 4600 146 192 Fig.

Fig. 2 Effect of Wellbore Related Parameters on Well Productivity 33 Fig. 16 Effect of perforation tunnel length on flow efficiency Fig. 17 Simulation of liquid loading in wellbore (effect of gas production rate) The well production performance modelling results also showed that use of oil based mud instead of water based mud can help reducing liquid loading, since oil has less density than water, and therefore gas can better lift the liquid to surface. Therefore, underbalanced drilling using non-aqueous liquid can reduce the issues related to liquid loading in wellbore during clean-up.

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