Simulation Experiment Study on Adhering Sand Casing Well Full-Waveform Characteristics
From the perspective of acoustics, two layers of medium including cementing agent and sand grains exist between the casing and cement sheath of adhering sand casing well, which can impact the acoustic waveform received by the receiver on the borehole center axis. If the cementing quality of adhering sand casing well is evaluated according to existing standards, wrong interpretation can be generated, which will impair the oil field development effect. To solve this problem, an acoustic logging simulation experiment was designed to observe characteristics of full waveform received, and respectively calculate the relative amplitude of casing waves of casing well and adhering sand casing well. Besides, the relative amplitude of casing well was regarded as the benchmark to work out correction factors of relative amplitude under different cementing conditions of adhering sand casing well, and establish acoustic logging evaluation standards for cementing quality of adhering sand casing well. It’s hoped that these can serve as a guide for cementing quality evaluation and enhance the interpretation accuracy for the cementing quality of adhering sand casing well.