Cold production method for heavy oil at the structural edge of oil reservoir for Huabei Oilfield

In this paper, a series of studies were carried out to guarantee the normal production of heavy oil wells (viscosity of crude oil higher than 10 000-40 000 mPa·s, 50℃) at the structural edge of oil reservoirs.First, the factors controlling the viscosity of heavy oil at the structural edge of oil reservoirs were analyzed.Then, some measures were taken.For example, radial drilling is carried out in oil layers, viscosity reducing agent is applied in oil layer, and progressive cavity pump is combined with coaxial dual-hollow rod.As a result, normal production is realized in 15 heavy oil wells.It makes a certain contribution to the natural decline of oil reservoirs and provides the reliable development data for progressive extension of oil reservoirs, as well as the reference for the production of heavy oil at the similar structural edge.