Numerous research surveys justified that the major purpose of well stimulation is the productivity increase by means of elimination of bottomhole damages in formation and well. This process appears directly by creating a certain structure in formation. Thus, in field conditions as a stimulation method the fracturing, acid treatment of reservoirs, as well as acid treatment of cracks (acid fracturing) are generally applied. Field studies showed that due to the radial nature of the flow the pressure decrease is basically occurs near the well and in the bottomhole. The analysis justifies that any damage in this area significantly increases the pressure reduction and the effect of such damages may be presented by means of “skin-factor”. The authors present more generalized concept of “skin factor” combining the most important aspects of bottomhole zone damages of production well. These processes create additional resistance decreasing production. From our perspective, the well stimulation is the productivity increase. In this case there is scientific-practical sense to consider the stimulation as a method for “skin-effect” value reduction. The paper offers a new parameter of “generalized skin-effect” or “generalized skin-factor” showing positive results with negative values, i.e. increases performance and productivity.
Hydraulic Fracture Stimulation and Acid Treatment of Well Baca 20; Geothermal Reservoir Well Stimulation Program