Ideal fracture geometry differs depending on the relative permeability conditions. Reservoir length is the most important dimension in low-permeability reservoirs, whereas reservoir width is more important in high-permeability reservoirs.
Artificial Lift
In general, the objective of artificial lift processes is to reduce the bottom hole flow pressure by increasing the flow rate. The Gas Lift method relies on gas compressor systems controlled by valve systems and produces oil and gas at the surface. Beam pumping has been used in its most conventional form, relies on gravity-based beam pumping units used by the industry since the 19th century. Various more modern forms of beam pumping systems include unitorque, air-balanced, and low-profile pumping unit configurations.
More particularly, electrical submersible pumps can lift high volumes of product at lower cost per volume; they are simpler to operate; and have much smaller and less obtrusive profiles above the surface. Conversely, this method (obviously) depends on the availability and affordability of electric current and at high voltages and it is generally limited to a maximum reservoir depth of 10,000-foot depth. Other limitations and potential complications that must be considered are potential problems caused by the electric cable, limitations in the maximum casing size, and flow problems caused by gaseous and solid materials.
