Influence of X-Ray Source Emission Angle onLogging Performance

Against the backdrop of continuous progress and development in oil and gas exploration technology, the design and measurement methods of controllable X-ray density logging tools have received widespread attention. On the basis of the ultra-slim X-ray logging tool, the emission angle of the X-ray source is changed, and Monte Carlo simulation is used to determine the optimal emission angle of the X-ray source based on detection efficiency, density measurement sensitivity, detection depth and other indicators. On this basis, simulate the actual geological environment to verify the measurement accuracy of formation density and Pe for the selected X-ray source emission angle, and compare and analyze the ultra-slim X-ray logging tool with the gamma logging tool after selecting the optimal emission angle. The research results show that setting the X-ray source emission angle to 135°, the near detector has the highest density measurement sensitivity, and the instrument detection depth is 6 cm, which can make the ultra-slim X-ray logging instrument have the best logging effect. At an emission angle of 135°, the density accuracy measured by the ultra-slim X-ray logging tool in the limestone formation under naked eye conditions is 0.004 1 g/cm3, and the Pe accuracy is 0.013 9. In addition, under the condition of light mud cake, the density measurement error of the ultra-slim X-ray tool after selecting the optimal emission angle decreased by 0.002 4 g/cm3, and the Pe measurement error decreased by 0.026 2. Using this optimization method, the measurement accuracy is greatly improved.