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→Flow systems
===Flow systems===
===Flow systems===
Either linear flow or radial flow is commonly used to analyze production data and to forecast reserves. In ''linear flow'' systems, fluid flows in parallel paths to a fracture. In ''radial flow'' systems, fluid flows in a path that converges to the wellbore, causing high pressure drops near the wellbore because of high fluid velocity (see [[Fundamentals of fluid flow]]).
Either linear flow or radial flow is commonly used to analyze production data and to forecast reserves. In ''linear flow'' systems, fluid flows in parallel paths to a [[fracture]]. In ''radial flow'' systems, fluid flows in a path that converges to the wellbore, causing high pressure drops near the wellbore because of high fluid velocity (see [[Fundamentals of fluid flow]]).
Linear flow is observed as a straight line ([[:file:production-histories_fig2.png|Figure 2]]) on a log Δ''p'' or log 1/''q'' versus log Δ''t'' graph of field data. Linear flow is common in low permeability reservoirs where pressure changes very slowly and fluids move slowly through the reservoir. Radial flow is expected in wells with high permeability or in old wells where the drainage area is large.
Linear flow is observed as a straight line ([[:file:production-histories_fig2.png|Figure 2]]) on a log Δ''p'' or log 1/''q'' versus log Δ''t'' graph of field data. Linear flow is common in low permeability reservoirs where pressure changes very slowly and fluids move slowly through the reservoir. Radial flow is expected in wells with high permeability or in old wells where the drainage area is large.