An experimental device and method for evaluating the damage of fracturing fluid to oil reservoirs
A technology of reservoir damage and experimental equipment, applied in the direction of material inspection products, soil material testing, etc., can solve problems such as complex circuits, long measurement time, and difficult control of cracks, and achieve the effect of improving measurement accuracy and reducing testing costs
Inactive Publication Date: 2019-04-23
TSINGHUA UNIV
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Problems solved by technology
Because the cores of tight oil reservoirs are very dense, manual fracturing of standard cores is required before injection of fracturing fluid, and the size of fractures is difficult to control. core, and then measure the flow out of the core, this method requires high equipment costs, complex circuits, high test costs, long measurement time, and the flow details of the fluid in the core cannot be obtained
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[0018] The specific structure, principle and working process of the present invention will be described in detail below with reference to the accompanying drawings.
[0019] figure 1 It is a schematic diagram of the structure and principle of a device for evaluating the damage of fracturing fluid to petroleum reservoirs. The device includes a graduated cylinder 1, a micro-channel model, a capillary 8, a microscope head 9, an image collector 10 and a computer 11; the micro-channel model includes The rock slab base 14, the rock slab micro channel 15, the glass upper cover 5 and the glass bottom plate 13; the rock slab micro channel 15 is directly processed on the rock slab by a femtosecond laser. After the micro channel processing is completed, it is respectively bonded with the glass upper cover plate 5 and the glass bottom plate 13, and the rock slab base 14 and the rock slab micro channel 15 are sealed therein; The front inlet of the rock slab micro channel is connected, and...
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Abstract
The invention discloses an experimental device and a test method for evaluating the damage of a petroleum reservoir caused by fracturing fluid. The device comprises a measuring cylinder, a micro-channel model, an entrance conduit, an exit conduit, a capillary tube, a microscopic lens, an image collector and a computer, wherein the micro-channel model comprises a rock board substrate, a rock board micro-channel, a glass upper cover plate and a glass bottom plate. In the method, water and fracturing fluid are injected into the rock board micro-channel under the effect of certain pressure difference; the damage degree of the core caused by the fracturing fluid is evaluated by comparing the water flow change in the rock board micro-channel before and after introducing the fracturing fluid. The micro-channel model disclosed by the invention is processed on a true core by use of a femtosecond laser, the measurement result is closer to the true situation, a complicated and hard-to-control fracturing process is unnecessary before measurement, special high-pressure drive equipment is not needed in the experimental system, and the test cost is greatly lowered; and in the test, the flow passing through the rock board micro-channel is measured by use of the capillary tube, the image collector, the microscopic lens and the computer, and the measurement precision is greatly improved.
Description
technical field [0001] The invention relates to a device and method for evaluating the damage degree of fracturing fluid to a reservoir, in particular to a device and method for evaluating the damage of fracturing fluid to a petroleum reservoir. Background technique [0002] In low permeability and tight oil reservoirs, because the pores of the reservoir are small, artificial fracturing is usually required to create gaps in the core to achieve the purpose of improving oil recovery. However, in the fracturing process, the injection of fracturing fluid will cause the original pores of the reservoir to be blocked and reduce the permeability of the original reservoir, which we call fracturing fluid damage; how to evaluate the effect of fracturing fluid on the reservoir. Injury and choice of fracturing fluid are critical. The existing evaluation methods mainly measure the permeability change of standard cores before and after injection of fracturing fluid. Because the tight oil...
Claims
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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 郝鹏飞谢斌黄波韩飞鹏高叶
Owner TSINGHUA UNIV