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Visible experimental method and device for hydraulic fracturing fracture propagation of oil and gas wells

A fracture expansion and hydraulic fracturing technology, which is applied in earthwork drilling, material inspection products, boreholes/well components, etc., can solve problems such as the inability to fill natural fractures, the difficulty in simulating pore pressure, and the inability to directly observe fracture propagation paths, etc.

Active Publication Date: 2016-09-07
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0012] In order to overcome the shortcomings of the existing experimental methods, such as the inability to directly observe the fracture propagation path, the difficulty in simulating the pore pressure, the inability to realize the filling of natural fractures, and the inability to reflect the impact of drilling on the disturbance of the in-situ stress field, the present invention provides a hydraulic fracturing fracture for oil and gas wells. Extending the visualization experiment method while providing an experimental setup suitable for the above method

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  • Visible experimental method and device for hydraulic fracturing fracture propagation of oil and gas wells
  • Visible experimental method and device for hydraulic fracturing fracture propagation of oil and gas wells
  • Visible experimental method and device for hydraulic fracturing fracture propagation of oil and gas wells

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Embodiment Construction

[0039] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0040] Part 1: Some technical terms involved in this article are explained as follows:

[0041] Visualization: Through real-time observation of things, invisible objects can be observed, and the most direct observation of real-time dynamics of things.

[0042] Hydraulic fracturing: A process in which fracturing fluid is continuously pumped into a simulated wellbore at a large volume through a surface high-pressure pump set, and the rock is subjected to tensile failure or shear failure under the action of high-pressure fluid to form fractures and expand.

[0043] Since the size and construction parameters of the experimental model and the field prototype are quite different, similarity criteria need to be established to obtain meaningful experimental results. The similarity coefficient of the fracturing simulation experiment needs to satisfy the followi...

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Abstract

The present invention involves a hydraulic fracture crack expansion visual simulation experiment method and its device. The device consists of a rock sample room, geographical stress loading unit, simulated fracture tube column, high -speed camera, high -pressure pump injection unit, data measurement and collection unit, etc.Among them, there are four transparent observation ports on the top cover of the rock sample room.The method is to first prepare flat rock -like samples, high -pressure water cut prefabricated natural cracks, and fill the epoxy resin to form a filling type crack; then wait for the rock -like saturated water for 3 to 5 days. After the saturated water is complete, Load the three -axis stress on the rock sample, and drill the shaft eye under the condition of three -axis stress to install the simulation fracture tube column; finally, connect the high -pressure pipeline and the flat pump, pump injection fissure, and high -speed camera records at the same timeThe crack extension path, the pressure transmitter measures the pressure change of the pump injection.The present invention can visualize the path of hydraulic crack expansion on the plane, providing a new experimental method for studying hydraulic crack expansion mechanisms.

Description

technical field [0001] The invention relates to a visual experiment method for hydraulic fracturing crack expansion of oil and gas wells, and provides an experiment device suitable for the method, which belongs to the field of oil exploitation. Background technique [0002] Hydraulic fracturing is a widely used oil and gas well stimulation technology in oil production, especially in low-permeability oil and gas reservoirs and unconventional gas reservoirs such as shale gas and coalbed methane, which have achieved good stimulation effects. Its basic principle is to inject a large volume of fracturing fluid (liquid or gas) into the wellbore through the surface high-pressure pump group, causing formation rocks to form tension or shear fractures under the action of fluid pressure, and finally form fractures with A network of man-made fractures with a certain conductivity. [0003] The research on the mechanism of hydraulic fracturing fracture propagation has always been a hot a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26
CPCG01N33/24
Inventor 盛茂李根生邵尚奇田守嶒陈立强耿黎东
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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