Study On Residual Oil Evaluation And Plan Adjustment About Long Borehole Section And Multilayer Reservior

Enclosing the study on residual oil distribution and plan adjustment of long borehole section multilayer reservoir and in combination with developement dynamic analysis and production split reservoir engineering analysis, the paper forms a method of distribution and excavation to residual oil long borehole section multilayer reservoir, and summarizes the distribution of residual oil and the adjustment of residual oil development program. Through research, the paper made the following knowledge and innovation results:1. Formed prediction and evaluation technique for residual oil in long borehole section multilayer reservoir. The technique includes reservoir dynamic comprehensive analysis qualitative - semi-quantitative residual oil prediction, quantitative study of residual oil distribution in which detailed reservoir simulation technology and integrated evaluation of residual oil classification are involved. In this study, since the distribution of oil sands in the main block is scattered, and it is quite difficult for numerical simulation, this paper presents qualitative to semi-quantitative evaluation technology for residual oil in oil sand bodies, providing a new technical method for forecast of residual oil in complex oil sands. Based on minor layer oil sands chart compiling and the assessment of oil sands reserve, the paper splits single well injection rate and production rate to minor layers to implement the injection rate and production rate onto oil sands, and based on this, analyzes the injection and production to make clear recovery level of the oil sands, and according to the assessment on changes of reservoir properties and connectivity in oil sands, analyzes the movement direction of oil and water to study the recovery difference and potential distribution inside the oil sands.2. Realized the oil sand reservoir developing technology policy. The article established the water flooding control and evaluation model about small oil sand contrary to the reality of the scattered distribution of the oil sands. From the geological point of view of scattered distribution of the oil sands,thesis study the well density under different degree of control, single oil sands water flooding control the minimum size limits and minimum size of reserves, and the marginal adjustment reservoir encryption technology policy limits to development and adjustment. It made the adjustment from the qualitative analysis into a quantitative evaluation, evaluation by a single well into the overall evaluation. The adjust plan for the oil field encryption provides a theoretical basis to ensure the economic effects of the marginal reservoir.3. Developed production split program. On the problems in production rate split, this paper put forward new ideas to solve the major problems that have been troubled production split for a long time, the main results are reflected in two aspects: one is the accurate calculation of production split coefficient, the other is programming of production split and output statistics.