Drilling fluid dynamic damage evaluation instrument based on glass core

Abstract

The invention discloses a drilling fluid dynamic damage evaluation instrument based on a glass core, belonging to the field of drilling exploration. The instrument comprises a controller and a bracket, wherein a kettle body is arranged on the bracket; a well for placing a drilling fluid is arranged in the kettle body; a well cover is arranged at the upper end of the kettle body; a rock core clamping assembly communicating with the well is arranged on the side surface of the kettle body; a metering assembly is movably arranged at the other end of the rock core clamping assembly; a stirrer for stirring the drilling fluid is arranged in the well, and a power part for driving the stirrer is arranged outside the kettle body; and the well cover is provided with a data detection hole used for installing a temperature and pressure sensor and a pressurizing hole used for installing a pressurizing device. According to the invention, the drilling fluid can be prevented from being retained in a flow guide chamber, and meanwhile, the drilling fluid in the glass core can also be counted, so the acquisition precision of the filter loss of the drilling fluid can be greatly improved, and then the damage evaluation precision of the drilling fluid is improved.

Description

technical field [0001] The invention relates to the field of drilling exploration, in particular to a glass core-based drilling fluid dynamic damage evaluation instrument. Background technique [0002] Lost circulation is one of the most troublesome drilling problems. Some well control problems may also result from increased economic costs due to the loss of expensive drilling fluids into the formation. The incidence of lost circulation in the world accounts for about 20% to 25% of the total number of wells, so lost circulation has always been a concern at home and abroad. [0003] Filtration refers to the penetration of free water in the drilling fluid into the cracks or pores of the well wall rock under the action of pressure difference. During the filtration process, some solid particles in the drilling fluid will adhere to the well wall to form a mud cake. After the mud cake is formed on the well wall, it will prevent or slow down the further intrusion of water in the ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, a glass core-based drilling fluid dynamic damage evaluation instrument provided by the present invention solves the problem that the existing evaluation instrument cannot accurately evaluate the drilling fluid damage

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