The Numerical Simulation of Sector Cement Missing Characteristic Wave in Vertical Well

Abstract

Numerical simulate the sound field of the Ⅱ interface sector cement missing in the vertical well. And study the influencing factors of the characteristic wave amplitude and travel time by the sector missing angle, the fluid ring thickness, and the formation media and so on. It is considered that the sector missing angle has a great influence on the amplitude of the characteristic wave, but has little influence on the first wave travel time. As the sector missing angle increases, the characteristic wave amplitude also increases. When the thickness of the fluid ring is greater than a certain value (5mm), the thickness of the fluid ring increases. The amplitude of the characteristic wave increases gradually when the sector missing angle is the same. From the influencing factors of characteristic wave amplitude change, we can see that the angle change of sector cement missing is equivalent to the fluid ring thickness change.