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

Abstract

The invention discloses a device and method for measuring the adhesion strength of bridging plugging materials and rock walls. The device includes a main controller, a measuring housing and a hydraulic system. The measuring housing is fixed on the base through a gantry; A hollow core is provided; one end of the measurement housing is provided with a limit block for limiting the position of the hollow core; a first piston and a second piston are arranged in the hollow core, and the first piston is fixed to the first base block through the first arm Above; the second piston is fixed on the second base block through the second limb, and the second piston is provided with a liquid discharge port. This device can realize 360° contact between bridging plugging material and rock, simulate the process of bridging plugging material being consolidated under pressure in rock, and measure the adhesion between bridging plugging material and rock wall in time under high temperature and high pressure conditions. Adhesion strength, providing the accuracy of the adhesion strength test of bridging plugging materials in the downhole high temperature and high pressure environment.

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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