Crude oil from Oilfield mined containing certain amount of water, so it need to be done oil - water separation that its moisture content reach requirements and will be on the market. Due to other methods having some shortcomings, physical separation is widely used. Spiral pipe separator has the character of simpler structure and lighter weight, becoming one of the most common centrifugal separation methods. Adapting computational fluid dynamics of VOF model, using the simulation software, oil - water separation of different inlet velocity in spiral pipe was simulated, and the oil - water separation rule was obtained. The farther from the axis, the speed is smaller and the lesser velocity the evener distribution. The most regional of water and phase distribution appeared in each lap nearly entry outside. Oil - water separation is in a cyclical along with the axial. It supplies spiral pipe separation and improvement provides with a theoretical.

In order to effectively maintain a stable crude oil production, scientific workers put forward a hydraulic sandblasting jet technology for cutting, rock fragmentation and cleaning. It can increase the penetration depth, reduce ballistic compaction damage, and improve the fracturing effect. Due to the factors of superficial study and high cost, it failed to get extensive application over a long period of time. Rapid development of computer technology and increasingly mature computational fluid dynamics for hydraulic provides a reliable way to injection desander numerical study. Using computational fluid dynamics method and simulation software, the different abrasive density, size and jet speed spray desander working conditions were on the numerical researched. Pressure of cutting sewing place increases with particle diameter and jet speed ,but decreases with particle size. It provides the improvement of sandblast Perforation with basis theory.