The Research Of Gaotaizi Tight Reservoir Evaluation And Effective Development In The West Of Daqing Placanticline

In this dissertation, experimental methods of constant-rate mercury injection, NMR and physical simulation technology were used to study the microscopic pore structure, the movable fluid percentage and the curve of flow, and reveal the seepage law in Gaotaizi reservoir of West Daqing Placanticline. The classification method of tight reservoir preferred the favorable area by using logging techniques and reservoir evaluation. Based on the large model physical simulation and numerical simulation, applying the effective development technology to design the adjustment programs of Gaotaizi area got good results. The main research findings are as follows:1.According to analyzing the features of Gaotaizi tight reservoir deeply, we find the large size throats dominant the capacity of fluid permeability, Gaotaizi tight reservoir has a greater potential for development compared to other tight reservoirs, the throat is 1.10μm on average and it is classified Type Ⅲ. The NMR spectrum show the structure of crest change one vertex to two vertices gradually with the increasing permeability, the average movable fluid is 30.43% and it is classified Type Ⅳ. The minimum starting pressure gradient and the quasi starting pressure gradient have a good correlation with the permeability. The average minimum starting pressure is 0.0479MPa/m, the average quasi starting pressure gradient is 0.1685MPa/m, and it is classified Type Ⅲ.2. Combined reservoir evolution and logging curve analysis, introduced the clay content and reservoir thickness, we created ’flat five parameters classification methods’, proposed four ranks standard. It can solve the problem of evaluating not fully utilized and strongly heterogeneity reservoirs also can support the development of product.3. Using large model physics simulation systems, reservoir engineering methods and nonlinear numerical simulation studied the effective development. We introduced the effective pressure coefficient and the effective production coefficient to evaluate the effective development. We found that the fracturing scale is closely related to the effectiveness of horizontal wells with depletion, and different permeability will bring different development under low pressure, conversely the effect will tend to be consistency under high pressure. Through A and B zones of vertical wells and horizontal wells comparative simulation study, we found that infill wells or horizontal manner can significantly improve reservoir development.4. By investigating the production status of infill wells area, we calculated the appropriate distance between wells, and designed three horizontal wells and eight conversion wells improving the well network and the utilization of oil wells. We also predicted the production of horizontal wells and determined the lower limit production of single well, after we had analyzed the economic returns and have proved the programs has good maneuverability and anti-risk ability.