Simulation experiment device for complex working conditions in fractured formations

Abstract

The invention provides a fractured stratum complex working condition simulation experiment device. The fractured stratum complex working condition simulation experiment device comprises a simulation shaft unit, a simulation fracture unit, a simulation stratum unit and an adjusting part, wherein the side wall of the simulation shaft unit is provided with a shaft through hole; the side wall of the simulation stratum unit is provided with a stratum through hole; the shaft through hole is communicated with the stratum through hole through the simulation fracture unit; the adjusting part is used for adjusting the overflow area of the shaft through hole. A process in which a fracture of the fractured stratum is drilled gradually can be simulated by adjusting the overflow area of the shaft through hole, so that reliable theoretical data can be provided for leakage, gas migration and gas-liquid gravity displacement working conditions of the fractured stratum through experiments, and a reasonable solution can be made conveniently.

Description

Technical field [0001] The invention relates to a simulation experiment device in the field of petroleum drilling, in particular to a simulation experiment device for complex working conditions of a fractured formation that can obtain relevant parameters of complex working conditions downhole. Background technique [0002] With the continuous deepening of exploration and development in my country, the focus of future development will be deep oil and gas resources dominated by marine carbonate formations. Fractures and karst caves are developed in this type of formation. During the drilling process, due to the high conductivity of the fractures, the safe mud density window of the drilling fluid is narrow, and there will be complex downhole working conditions such as leakage, gravity displacement, and overflow at the bottom of the well. During the drilling process, such accidents are mainly dealt with based on experience, and there is a lack of corresponding theoretical research. ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that the experimental device in the prior art can only observe the fluid flow in the wellbore, so that the parameters obtained in the experiment have little guiding effect on the actual drilling, the present invention provides a simulation experimental device for complex working conditions in fractured formations, which can simulate The process in which the fractures in fractured formations are gradually drilled, so that the experiment can provide reliable theoretical data for the working conditions of lost circulation, gas invasion, and gas-liquid gravity displacement in fractured formations, so as to formulate a reasonable solution

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