Experimental facility for simulating forming process of mud cake

Abstract

The invention discloses an experimental facility for simulating the forming process of a mud cake. The experimental facility comprises a simulation shaft and invasion chambers; the simulation shaft is connected with a feeding bin and a pressurizing pump; a stirring shaft is arranged at the hole axis position of the simulation shaft; and the stirring shaft is in transmission connection with a stirring motor. Impellers are arranged on the stirring shaft, and windows are formed in the simulation shaft; stratum modules are arranged in the invasion chambers; the invasion chambers are connected to the windows of the simulation shaft in a sealing manner; and leak-off flow measuring devices are arranged at the outlet ends of the invasion chambers. According to the experimental facility, mud filtration experiments of different mud types, different mud pressures and different hydrodynamic conditions are achieved, and the favorable condition is created for researching the forming rule of the mud cake and evaluating the leak-off performance and the wall building property of mud, and the experimental facility is of great significance in optimizing the mud property and protecting reservoir production capacity.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, and belongs to the technical category of reservoir rock physics experiments, in particular to an experimental platform for simulating the formation process of drilling mud cakes. Background technique [0002] During overbalanced drilling, mud cake will be formed on the well wall to delay the invasion of the mud filtrate into the formation and prevent the hole wall from collapsing. Therefore, the formation law of drilling mud cake is an important research content of drilling engineering. [0003] At present, the existing mud cake formation process simulation devices at home and abroad mainly include: simulated well-scale mud invasion simulation device; core-scale mud invasion simulation device; drilling fluid dynamic and static fluid loss instruments. [0004] The advantages of the simulated well-scale mud invasion simulation device: the wellbore hydrodynamic environment and mu...

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Problems solved by technology

[0007] In view of the problems of high cost, low utilization rate, and unrealistic simulation degree of the current mud cake formation simulation device, the present invention designs an experimental device with a moderate size of the experimental object, complete functions, and the ability to realistically simulate the mud cake formation process under complex drilling conditions. It is of great significance to study the law of mud cake formation, optimize mud performance, and protect reservoir productivity

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