Research On Logging Data Interpretation Method Of Shale Gas Well Production Profile

Horizontal well multi-stage fracturing as an important technical means for shale gas production has been widely used in major shale gas production areas at home and abroad,and production profile logging interpretation is an important means to improve recovery.The production profile interpretation models are derived for vertical wells.The velocity field of fluid in horizontal wells is more complicated than that in vertical wells.Therefore,it is very important to be able to establish a set of production profile logging interpretation models suitable for horizontal wells..Flow pattern is a prerequisite for accurate interpretation and affects the choice of model.The main physical experiments at home and abroad are mainly analyzed,and the corresponding flow pattern chart is established.Relatively speaking,the parameter conditions are limited by the experimental equipment itself and cannot be close to real mining.Happening.However,numerical simulation technology has been applied in the research of shale gas seepage and migration mechanism,and there is little research on the flow pattern and velocity field of the production profile.First,through a large amount of literature research,this paper analyzes the reservoir characteristics,occurrence mode and migration and production mechanism of shale gas.Set the numerical simulation parameter conditions according to the experimental design plan to simulate the flow conditions under the same conditions.With the aid of the multiphase flow simulation experimental device,the MAPS array combination logging tool was selected to carry out related physical experiment simulation,the experimental data was exported and the related experimental process was recorded,and finally the numerical simulation results and the flow pattern and holdup rate of the experimental results were analyzed.After comparing and analyzing the numerical simulation results and the experimental results,it is found that the results are basically the same,and the correlation is good.The study found that the gas-water two-phase flow pattern is affected by the total flow rate and well deviation;under the same water cut horizontal well condition,the flow pattern transitions from stratified flow to slug flow and bubbly flow with the increase of water cut.When consistent,the flow pattern also follows the same law as the well inclination increases.Comparing the holdup rate between physical experiment and numerical simulation under the same water-bearing condition at low flow level,the error is within 15%,indicating that the numerical simulation has good applicability in flow pattern prediction and holdup calculation.At the same time,the simulation takes into account the influence of the instrument on the distribution of the surrounding fluid flow pattern and velocity field.By post-processing the numerical simulation file,the velocity contour map of the fluid in the wellbore is obtained.The analysis shows that the maximum velocity of the fluid is concentrated below the instrument.The phase area further guides the subsequent flow calculation method.After processing and analyzing the experimental data,the four holding rate calculation methods of the array water holdup meter and the air holdup meter are summarized: the average method,the layered interface method,the imaging method,and the integral method,as well as the equidistant weighted average method and the integral method.The two flow calculation methods use experimental data to calculate the method.Comparing the results with the experiment shows that the calculation error of the holding rate calculation using the CAT instrument is small,and the calculation method of the flow and holding rate uses the integral method to obtain an error of 10 Within %,there is good applicability.