Rock block friction coefficient measuring method and device based on fluid environment

Abstract

The invention provides a rock block friction coefficient measuring method and device based on a fluid environment. The device comprises a support assembly, a sliding assembly, a constant-temperature liquid tank assembly, a control assembly and a monitoring assembly. A positive pressure is applied to a steel wheel through screw cap adjustment. A pressure transmitting member is used for equivalentlytransmitting a force of the steel rail on the steel wheel to the upper surface of an upper friction rock block. An electric control hydraulic device serves as a power system of a tangential force, and a pushing force is transmitted through a thrust rod. An experimental fluid is contained in a liquid containing tank, and the experimental fluid is heated through an electric heating wire. A pressuresensor monitors a positive pressure and a tangential force on the rock block; a temperature sensor and a displacement sensor monitor a temperature of the experimental fluid and a sliding distance ofrock block friction respectively; and a friction coefficient of the rock block is obtained through calculation. Therefore, the rock block friction coefficient measuring method and device based on thefluid environment provided by the invention is suitable for rock block friction coefficient measuring of the fluid environment under different positive stress conditions; and the actual fluid environment where the underground rock block of an oil-gas well is located can be simulated more really.

Description

technical field [0001] The invention relates to a method and a device for measuring the friction coefficient of a rock block, in particular to a method and a device for measuring the friction coefficient of a rock block based on a fluid environment. Background technique [0002] With the increasing demand for oil and natural gas and the depletion of conventional oil and gas resources, the exploration and development of oil and gas resources in deep tight reservoirs has become an inevitable development trend. Fractures and joints in fractured rock mass are developed on multiple scales, and the distribution of fracture networks is complex. During the drilling and completion process of deep tight reservoirs, on the one hand, due to the redistribution of in-situ stress, the tangential stress increases, which is easy to cause tangential sliding of rock blocks. On the other hand, due to the oil and gas well working fluid immersing into fractures, physical and chemical reactions oc...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing rock friction experiment process can not fully simulate the actual fluid environment of downhole rock in oil and gas wells;

[0006] (2) There is a lack of an effective method for the friction coefficient of rock blocks based on the fluid environment under different positive pressure conditions

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