活跃水缝洞漏失堵漏模拟评价装置及实验研究.

Research shows that there is no equipment for simulating the mud loss zones in fractures and vugs with active water. Based on the investigation and study on the characteristics of the mud loss zones in fractures and vugs with active water, the functions to be achieved and the corresponding parameters of the simulation apparatus were clearly defined, and the structure and components of the apparatus were determined. The simulation apparatus is composed of five subsystems, which are the fracture and vug simulation subsystem, the formation water simulation subsystem, the lost circulation material slurry injection subsystem, the borehole simulation subsystem and the data acquisition subsystem. This simulation apparatus can be used to simulate a water flowing speed of 10 m/min and has a pressure bearing capacity of 2 MPa, satisfying the needs of controlling mud losses into most fractures and vugs with active water. Using this apparatus, the factors affecting the retention of gel in mud loss channels with active water were evaluated. The test results show that in a mud loss channel with atmospheric pressure, good retention of the lost circulation control gel can be obtained at the following conditions: the injection rate of a lost circulation control gel is greater than 1.2 times of the water flowing rate, the adhesion strength of the gel is greater than 10.1 N/m², and the density of the gel is between 1.1 g/cm³ and 1.2 g/cm³. This study has provided a guideline to the control of mud losses into fractures and vugs with active water. [ABSTRACT FROM AUTHOR]