Device and method for simulating interaction between rock core and drilling fluid under drilling condition

Abstract

The invention discloses a device and a method for simulating interaction between a rock core and drilling fluid under a drilling condition. The device comprises a piston vessel, a constant-flux pump and a displacement circulating pump, wherein the piston vessel comprises a hydraulic chamber and a rocker core chamber; the constant-flux pump is connected with the hydraulic chamber and used for loading working pressure on the rock core chamber; the displacement circulating pump is connected with the rock core chamber and used for pumping the drilling fluid into the rock core chamber and forming circular flow. Compared with the prior art, the measuring device is reliable in principle, simple in structure and strong in maneuverability. The device realizes the environmental behavior characteristic simulation for the contact action between dynamic drilling fluid and the rock core under a high temperature and a high pressure and provides a reliable basis for the rock core intensity characteristic change and drilling fluid rejection capability evaluation so as to guide the reasonable design for an on-site drilling fluid scheme.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a device and method for simulating the interaction between a rock core and drilling fluid under drilling conditions. Background technique [0002] During the oil drilling process, the drilling fluid filtrate will enter the core through the effects of hydraulic pressure difference, chemical potential difference, concentration difference, capillary force, etc., resulting in the migration and exchange of water and ions between the core and the drilling fluid. These environmental behavior characteristics will cause changes in the strength and mechanical characteristics of the easily collapsed core body, and this environmental behavior characteristic changes dynamically under the action of circulating drilling fluid. The change law of core strength and mechanical characteristics under the action of drilling fluid is an important index for the analysis of wellbore stab...

AI Technical Summary

Problems solved by technology

[0004] 1. The maximum loading pressure is 5MPa, which cannot simulate the real formation pressure of thousands of meters underground

[0005] 2. The core is soaked in the drilling fluid statically, which cannot simulate the complex working conditions of the core in contact with the dynamic circulating drilling fluid under drilling conditions

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