By Nick Bahrami
Tight gasoline reservoirs have very low permeability and porosity, which can't be produced at in your price range stream charges until the good is successfully influenced and accomplished utilizing complicated and optimized applied sciences. cost-effective construction at the foundation of tight gasoline reservoirs is tough quite often, not just as a result of their very low permeability but in addition to numerous diversified varieties of formation harm which may ensue in the course of drilling, of entirety, stimulation, and construction operations.
This examine demonstrates intimately the consequences of alternative good and reservoir static and dynamic parameters that effect harm mechanisms and good productiveness in tight gasoline reservoirs. Geomechanics, petrophysics, construction and reservoir engineering services for reservoir characterization is mixed with a reservoir simulation strategy and center research experiments to appreciate the optimal technique for tight fuel improvement, providing stronger good productiveness and fuel recovery.
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Extra info for Evaluating Factors Controlling Damage and Productivity in Tight Gas Reservoirs
The results for gas production rate from the model are shown in Fig. 13 [1, 2]. 2 Effect of Wellbore Related Parameters on Well Productivity 31 Fig. 13 Effect of wellbore direction on well productivity the direction of minimum permeability (drilling in the direction of maximum horizontal stress, if permeability anisotropy is caused by stress anisotropy). 3 Wellbore Breakouts In order to understand the effect of wellbore break out on well productivity, the horizontal well model is run for a zero skin cased-hole perforated horizontal well (wellbore diameter of 8 inches), and zero skin open-hole horizontal well with enlarged wellbore (wellbore diameter of 20 inches).
11 Effect of damage to natural fractures on productivity 30 3 Tight Gas Reservoir Simulation Fig. 12 Productivity of hydraulic fractures: transverse versus longitudinal following cases are run in order to understand the effect of wellbore direction on productivity of hydraulically fractured horizontal well: No hydraulic fractures (No HF), one longitudinal hydraulic fracture along wellbore (1 LHF), one transverse hydraulic fracture perpendicular to wellbore (1 THF), five transverse hydraulic fractures perpendicular to wellbore (5 THFs), and nine transverse hydraulic fractures perpendicular to wellbore (9 THFs).
6, it is obvious that the wellbore liquid invades deeper in overbalanced conditions. However for underbalanced conditions, although the wellbore pressure is less than the reservoir pressure, water still invades the matrix rock due to the strong capillary suction and causes an increase in water saturation around the wellbore. Thus, damage caused by water blocking might still be significant even in the case of underbalanced drilling in tight formations, owing to the ability of high and negative capillary pressure (water suction) to compensate for relatively low mud pressure in the common case where the tight gas formation is strongly water wet.