Measuring device for determining invasion depth of mud filtrate

Abstract

The invention discloses a measuring device for determining the invasion depth of mud filtrate. The measuring device comprises a simulation wellbore, an invasion chamber and a data collection device, wherein a window is formed in the simulation wellbore; a stratum module is arranged in the invasion chamber; the invasion chamber is tightly connected with the window of the simulation wellbore; the invasion chamber is provided with an electrode; the outlet end of the invasion chamber is provided with a leak-off flow measuring device; the data collection device comprises a data collection controller and a computer; the electrode is connected with the data collection controller; and the data collection controller is connected with the computer. The measuring device has the characteristics of being vivid and visual in simulation degree, high in accuracy, simple to operate and the like; the device is suitable for measurement of mud invasion experiments of the stratum module under the conditions of fresh water mud and salt water mud and research of influences on an electric logging response of a reservoir caused by mud invasion, provides experimental data for building a mud invasion correction model of the logging response of the reservoir, and is of great significance on improvement of domestic mud invasion research capability.

Description

technical field [0001] The invention relates to reservoir rock physical experiment detection technology, in particular to an experimental measurement device for determining the invasion depth of mud filtrate through a resistance detection method. Background technique [0002] During overbalanced drilling, the mud filtrate enters the reservoir under the pressure difference between the inside and outside of the wellbore, changing the original state of the pore fluid around the well. Therefore, the accuracy of reservoir logging evaluation is reduced, and it is necessary to use the mud invasion correction model to reduce the adverse effect of the invasion zone on the measurement. The mud filtrate invasion depth is a key parameter of the mud invasion calibration model. It is necessary to establish empirical formulas for mud filtrate invasion depth, overbalance pressure difference, invasion time, mud type and other parameters through experiments. Depth measuring device. At prese...

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Problems solved by technology

The filtrate seepage pattern simulated by the plunger long core mud invasion experimental device is a horizontal linear flow, but the actual downhole situation is a plane radial flow, and the simulation degree is not realistic enough; the experimental core size is small, and the simulated invasion time is short, which is different from the actual drilling conditions bigger

The physical property conditions and seepage characteristics of the model in the mud invasion laboratory experimental device based on the sand filling model are quite different from the actual conditions of the reservoir, which limits the popularization and application of the invasion law obtained from the experiment

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