Discussion on single well production improvement of horizontal wells in Ansai oilfield

Horizontal wells developing technology is one of the primary methods to improve the single well production of lowpermeability,ultra low-penetration reservoir,which has been used in Ansai extra-low permeability field recent years.However,problems such as production decline and water-saturation arised in the developing process.To solve this problem,based on influential factors analysis,technologies that improve single production has been carried out,which includes mechanical water plugging towards horizontal wells,hydraulic fracturing and acidification measures.Application effects show long-term stable production of horizontal wells has been realized.