High frequency impact direct push split tube sampling technology for sandy pebble layers

Abstract:

Formation sampling quality determines the accuracy of contaminated site investigation. It is of great significance for environmental sampling to obtain samples without pollution or disturbance， but with the intact structure and the required core recovery. The sandy pebble layer is featured of soft and hard alternating with loose structure， resulting in low sampling rate， easy damage to the sample structure and low sampling efficiency. With regard to the pollution detailed investigation of a chemical park of a key industrial enterprise in Wuhai City where the high-frequency impact direct push drill was used together with the split tube sampling drilling tool， this paper introduces the high-frequency impact direct push split tube sampling technology and its application performance. The core recovery of this process in the sandy pebble layer was more than 85%， and the samples were kept highly undisturbed， which provides a reliable reference basis for drilling and sampling in this kind of stratum in the later stage.

Key words:high frequency impact direct push drill;split tube drilling tool;drilling sampling;contaminated site investigation;sandy pebble layer