As ultra-low permeability reservoir is developed by water flooding,it always presents characteristics of non-Darcy flow and permeability anisotropy. We derived water breakthrough time formula of five-spot well pattern,inverted nine-spot well pattern and rhombic nine-spot well pattern with basic non-Darcy flow formula and streamline integral method. Breakthrough time of one actual well pattern in Ordos Basin was calculated. Calculation results accorded with production data well. Effects of threshold pressure gradient, permeability anisotropy and viscosity difference between oil and water were analyzed. It shows that the greater the viscosity ratio of oil and water,the earlier the water breakthrough time; Corner well of rhombic nine-spot well pattern can realize uniform displacement both in x direction and y direction as ratio of well spacing in x direction and y direction equals to permeability anisotropy degree; The grenter the threshold pressure gradient,the latter the water breakthrough time. Effect of threshold pressure gradient became more apparent as well spacing is larger.

Based on drift model which copes with gas-liquid phase slippage and non-uniform distribution along section of wellbore,a coupled temperature-pressure prediction model was established for varied angle gas wellbores considering momentum conservation,conservation of energy and wellbore heat transmission. The model was validated with 15 tested gas wells. The calculation showed satisfying results with average absolute error of 3. 6% which meets engineering requirements.

A straight-line track model is developed, and validity of Kalman filter track reconstruction algorithm with the track model was verified in detail. It shows that given sufficient hits track parameters converge to true values. The track reconstruction program is implemented in MarlinTPC reconstruction framework in practice. By choosing track reeonstruction parameters reasonably, the program discriminates noise efficiently and reconstructs tracks. The algorithm is valuable in track reconstruction of large prototypes.