Device and method for measuring adhesion strength of bridging type plugging material and rock wall surface

Abstract

The invention discloses a device and a method for measuring the adhesion strength of a bridging type plugging material and a rock wall surface. The device comprises a main controller, a measuring shell and a hydraulic system, the measuring shell is fixed on a base through a portal frame; a hollow rock core is arranged in the measuring shell; a limiting block for limiting the position of the hollow rock core is arranged at one end in the measuring shell; a first piston and a second piston are arranged in the hollow rock core, and the first piston is fixed on the first base block through a first limb arm; the second piston is fixed to the second base block through the second limb arm, and a liquid outlet is formed in the second piston. The device can realize 360-degree contact between the bridging type plugging material and the rock, simulate the compression consolidation process of the bridging type plugging material in the rock, and measure the adhesion strength of the bridging type plugging material and the wall surface of the rock in time under the conditions of high temperature and high pressure; the testing accuracy of the adhesion strength of the bridging type plugging material in an underground high-temperature and high-pressure environment is improved.

Description

technical field [0001] The invention relates to the field of exploration, in particular to a device and a method for measuring the adhesion strength of bridging plugging materials and rock wall surfaces. Background technique [0002] As oilfield development continues, complex drilling accidents occur from time to time. Lost circulation is the most common downhole complex problem in the drilling process. It not only consumes drilling time and loses mud, but also may cause pipe sticking, blowout, well collapse, etc. A series of complicated situations even lead to the failure of the wellbore, resulting in significant economic losses. Bridging plugging materials are composite plugging materials formed by granular, fibrous, flake and other inert materials according to a certain mass ratio and particle size gradation. The bridging plugging material mainly forms a dense plugging layer through the functions of bridging, stretching, stacking, filling, etc. in the lost channel. It ha...

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Problems solved by technology

[0003] However, most of the current research in this field is still in the study of the single surface friction of the plugging material, and the existing measurement methods cannot simulate the compression and consolidation of the plugging material in the downhole high temperature and high pressure environment, nor can it simulate the pressure Adhesion to the adhesive rock after consolidation, so the adhesion strength between the bridging plugging material and the rock wall cannot be accurately obtained

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