Application the self-diverting acid to increasing the production wells (on example Orenburg OGCF)

Increasing the efficiency of oil and gas production wells is the primary problem in the industry. It became more actual because the most of the biggest fields are in the last stage development today. Hydrochloric and acid treatment is very common method of chemical treatment on bottomhole formation zone to increasing the oil and gas production in carbonate basin. But those treatments are not successful in spite of long-term applying and researchers aimed to improving the efficiencyof that method.
Materials and methods
Field trials on Orenburg oil gas condensate field.
Results
The application of self-diverting acid provides next points.
• Increasing productivity of producing wells operating reservoirs with heterogeneous carbonate reservoirs and temperatures from 20 to 120°C;
• The resulted gel creates effective local deviation to the low-permeability areas;
• The resulted viscous barrier temporarily decreases its properties until their full deacidification, and by contact with hydrocarbons;
• Eliminating of any chance of damage to the filtration characteristics of the bottomhole formation zone;
• Is uniform stimulation of all the productive reservoir interval.
Сonclusions
At the moment, the problem of non-uniform treatment of carbonate reservoirs is still relevant, thereby leaving the demand flow diverting technologies based on viscoelastic surfactant. Self-diverting polymer-freeacid composition allows to make uniform gentle stimulation of the bottom zone, effectively solving the tasks in a wide range of temperatures.