Measuring instrument for mud cake mechanical properties

Abstract

Belonging to the field of petroleum drilling, the invention discloses a mud cake mechanical property measuring instrument. The mud cake mechanical property measuring instrument comprises: a high temperature and high pressure kettle, a metal cylinder group, a first tensiometer, a second tensiometer and a torque motor. The high temperature and high pressure kettle is a cube structure provided with a cavity, the bottom is provided with a semicylindrical groove for generating a mud cake, the metal cylinder group is disposed in the semicylindrical groove and consists of a first metal cylinder, a second metal cylinder and a third metal cylinder, the height direction of the metal cylinders is parallel to the length direction of the semicylindrical groove, the diameter is smaller than that of the semicylindrical groove, and the side contacts the mud cake. The first tensiometer measures the mud cake friction, the second tensiometer measures the mud cake adhesion, and the torque motor measures the mud cake torque. The semicylindrical groove simulates the well wall state, and the metal cylinder group simulates drill columns. The mud cake mechanical property measuring instrument provided by the invention solves the problem that the mud cake friction and adhesion cannot be measured directly, and reaches the effect of direct measurement of mud cake torque, friction and adhesion.

Description

Technical field [0001] The invention relates to the field of petroleum drilling, in particular to a measuring instrument for the mechanical properties of mud cake. Background technique [0002] During the drilling process, due to the penetration of the borehole wall, the drilling fluid will be lost and enter the formation. In the process of fluid loss, the surface of the borehole wall will produce a certain thickness of mud cake due to the accumulation of solid particles in the drilling fluid. The size of the mechanical properties such as friction, adhesion and torque of the mud cake has an important influence on the stability of the well wall and the formation of pressure differential stuck. Among them, differential pressure sticking refers to the sticking of the drill string caused by the pressure difference between the drilling fluid column and the formation when the drill string is stationary in the well. [0003] There is a mud cake mechanical property measuring instrument in...

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Problems solved by technology

[0006] In order to solve the problem that the existing mud cake mechanical property measuring instrument can only measure the torque of the mud cake, but cannot directly measure the friction and adhesion of the mud cake, the present invention provides a mud cake mechanical property measuring instrument

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