Intermittent Trial Mining Well Testing Interpretation Method

The characteristics of periodic oil recovery are that formation pressure fluctuates periodically, so as the formation pressure cone of depression caused by it. The producing rate and bottom-hole pressure are unknown because of the periodic oil pumping. It is very difficult to get the analytic solution with the theory of percolation mechanics. In this paper it based on the theory of percolation mechanics, built the basic equations, the mathematical model was scattered into N order three opposite angles linear equations system, and then was solved with shooting method in this paper. In this paper, through the studying on the rule of bottom-hole pressure alteration in periodic trial-produce well, a new method was developed for off-take potential forecasting and well test interpretation.Studying on theoretical model:1. The rule of reservoir pressure distribution and bottom hole flowing pressure alteration of a periodic trial-produce well in infinity subterranean formation.2. The rule of pressure distribution and bottom hole flowing pressure alteration of a periodic trial-produce well near a faultage.3. The rule of pressure distribution and bottom hole flowing pressure alteration of a periodic trial-produce well in the radial compounding stratum.4. The rule of pressure distribution and bottom hole flowing pressure alteration of a periodic trial-produce well in the stratum with circular boundary.5. The rule of pressure distribution and bottom hole flowing pressure alteration of a periodic trial-produce well with fissure after fracturing (finite conductivity, infinite conductivity, uniformly flow rate).Through upwards research , develop interpretation and off-take potential forecasting software. The off-take potential forecasting and data interpretation methods were established for periodic trial-produce well, and the application software was programmed. The application can compute the flowing pressure in periodic recovery for trial-produce well, forecast the flowing pressure alteration trend under the condition of some production rate and production time, thereby optimize the best or reasonable trial-produce output and production time. Based on the condition of pressure alteration during periodic recovery, the data interpretation software mark off automatically the flow periods, and convert the reservoir producing rate according to the pressure alteration. Analytical approach can be modern well test analysis, conventional well test analysis, pressure historical fitting. Analyze and interpret the data of pressure return after periodical recovery. The reservoir model interpreted by the software is homogeneous reservoir considering of the well-bore storage and skin effect. The internal boundary condition is vertical well in homogeneous reservoir, vertical fissure with infinite or finite conductivity, compounding reservoir. The outer boundary condition is infinite or half infinite large circular reservoir.