Multi-scale seam net experimental device and experimental method thereof

Abstract

The invention provides a multi-scale seam net experimental device and an experimental method thereof. The device comprises a model main body frame, a digital partition plate, a digital grid, a mold pressing block and a displacement injection-production plug, the digital partition board divides the model main body frame into 22 mother areas (A1 to A11 and B1 to B11), 3 longitude areas (alpha1 to alpha3) and 10 latitude areas (beta1 to beta10), and each mother area is divided into four sub-areas (a, b, c and d) and a gamma net area by the digital grids; the device can realize simulation of a well pattern, a matrix, a hydraulic fracturing crack and a natural crack by filling natural rock cores or artificial rock cores into different areas according to actual oil reservoir conditions and integrally pouring the natural rock cores or artificial rock cores after pressing forming; further, saturation and pressure monitoring points are arranged in the primary area, the secondary area, the longitude area, the latitude area and the net area, so that the fluid state in the reservoir during oil reservoir exploitation can be dynamically monitored; based on the method, simulation of a big data multi-scale seam network model and pressure and saturation big data detection in a later experiment process can be realized.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas development, in particular to a multi-scale fracture network experimental device and an experimental method thereof. Background technique [0002] As China's petroleum industry enters into the stage of exploration and development of both conventional oil and gas and unconventional oil and gas, low-permeability-tight reservoirs have become a hot spot in exploration and development. For such reservoirs, hydraulic fracturing is usually used to increase oil and gas production. As fractures progress, the fracture network structure of formation rocks often changes, and the seepage characteristics are quite different from those of homogeneous cores. Therefore, fine evaluation and flow experiments of natural and artificial fractures in such reservoirs have become more and more important. At the same time, as the formation conditions in the development process become more and more complex, on-site ...

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Problems solved by technology

[0003] The existing fracture network cores mainly have the following four methods: (1) physical fracture (preparation method of carbonate rock slab core with finely characterized fracture structure, ZL201811058421.4), that is, cutting by grinding wheel cutting machine or water jet Cutting the core with a machine to form a fracture network on the surface of the core, but the fractures formed by this method can only be distributed on the surface of the core and the shape is difficult to control; (2) chemical fracture (an artificial core with multiple pore structures and its preparation method, ZL201410341399.X ), that is, in the core making process, add metal flakes and mix them with sand and cement, then fill sand, press, bake, and finally use acid to wash out the metal flakes to obtain fractured cores, but this method is due to the use of acid It will lead to changes in the chemical properties of the rock, which will lead to large experimental errors; (3) Hollow plate fracture (an artificial crack core preparation system, ZL201921431097.6), that is, the flat plate is processed to form a hollow plate with cracks and then put into the core for pressing The mold is used to make simulated fractured cores, but the contact between fluid and rock in this method is quite different from that of real cores; (4) Fracture creation with degraded interlayers (a method for making artificial fractured cores, 201610566936.X), which can be used immediately Degraded starch is used to make fracture barriers, and the well-mixed cement and sand are alternately filled into the core pressing mold for core production. After the production is completed, the starch is removed by degrading enzymes to obtain fractures. However, this method will result in insufficient degradation of the core. Changes in pore throat structure, intergranular contact relationship and sensitivity

[0004] Based on the above, the current artificial fracture network cores cannot meet the requirements of all laboratory experiments. Therefore, a multi-scale fracture network model preparation method and device are urgently needed to complete digital cores, fractured cores, horizontal well fracture network models, and large natural cores. Production, to promote the further development of my country's oil industry

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