Measurement device and method for fracture shapes after physical model samples are fractured

Abstract

The invention belongs to the technical field of the oil industry, and particularly relates to a measurement device and method for fracture shapes after physical model samples are fractured. The device comprises a test rack (1), locating clamping strips (2) are installed on the test rack (1) and are provided with a linear locating guide rail (3), the linear locating guide rail (3) is connected with a locating sliding block (4), the locating sliding block (4) and a locating box (5) are fixed together, a laser distance measuring instrument is installed in the locating box (5), the locating sliding block (4) can drive the locating box (5) to transversely move on the linear locating guide rail (3), and the linear locating guide rail (3) can longitudinally move on the locating clamping strips (2). The device is easy to operate, low in cost, convenient to use and high in precision, and the measurement method for the fracture shapes after the physical model samples are fractured through the device is applicable to indoor hydraulic fracturing physical experiment simulation and can accurately recognize multiple fractures.

Description

technical field [0001] The invention belongs to the technical field of the petroleum industry, and in particular relates to a measuring device and method for a fracture shape of a physical model sample after fracturing. Background technique [0002] The geometry of hydraulic fractures is one of the main factors affecting the effect of fracturing treatment. The monitoring and identification of fracturing fractures is a difficult point in fracturing design, especially in shale gas reservoirs that need to be stimulated through horizontal well drilling and multi-stage fracturing technology, and the formation of natural fractures in the reservoir after fracturing will be complicated The network fractures bring more challenges to the monitoring of fracture propagation patterns. The indoor hydraulic fracturing physical experiment simulation is an important means to understand the fracture shape in the fracturing process. Currently, the monitoring methods for the hydraulic fracturi...

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Problems solved by technology

In terms of visual observation, the distribution range of the tracer can be observed by the labeling of the tracer, but the fracture shape cannot be characterized; the sample is processed with a transparent material, which is limited to the large difference between the mechanical properties of the transparent material and the rock; based on the solidification fluid As a fracturing fluid, the material is cured in the fracture to realize the visualization of the fracture, which is affected by the temperature and the difficulty of separation after curing

In terms of indirect monitoring, the acoustic emission monitoring method can detect crack expansion in real time, but the effective identification of acoustic emission signal points is very difficult, and the simulation results are not intuitive enough; ultrasonic testing, CT scanning, and infrared thermal imaging have the advantages of high equipment sensitivity and detection The result is intuitive, but there are problems such as difficulty in identifying multiple cracks, high cost, and difficult operation

[0003] The Chinese invention patent with the application number 201210287011.3 discloses a hydraulic fracturing fracture monitoring device and monitoring method based on electrokinetic coupling. The device consists of three parts: a front-end conditioning module, a data acquisition module and a main control module. The problem that the monitoring results exceed the actual fracture size is high cost, complex equipment, difficult operation, and difficult identification of multiple fractures, which is not suitable for indoor hydraulic fracturing physical experiment simulation

The Chinese invention patent with the application number 201310019575.3 discloses a spatial reconstruction method of formation fractures based on core measurement. This method is difficult to identify multiple fractures, the operation is complicated, and it is not suitable for indoor hydraulic fracturing physical experiment simulation.

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