Device and method for simulating complex crack sand paving

A technology for complex fractures and fractures, applied in the field of oil and gas field development and research, can solve the problems of inaccurate experimental data and failure to consider in-situ stress, etc., and achieve the effect of accurate experimental data

Inactive Publication Date: 2017-06-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a device and method for simulating sanding of complex cracks to solve the problem that in the prior art, due to the fixed shape of the cracked plate, the width of the cracked plate will not change during a simulated sanding process; and there is no Considering the influence of ground stress, it has great limitations, and there is a big discrepancy with the actual situation, which leads to the problem of inaccurate experimental data

Method used

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  • Device and method for simulating complex crack sand paving
  • Device and method for simulating complex crack sand paving
  • Device and method for simulating complex crack sand paving

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Embodiment 1

[0029] figure 1 Schematic diagram of the structure of the device for simulating complex fracture sanding provided by Embodiment 1 of the present invention. figure 2 A cross-sectional view of the main fracture assembly provided for Embodiment 1 of the present invention when the fracture is closed. image 3 A cross-sectional view of the main fracture assembly provided for Embodiment 1 of the present invention when the fracture is opened. The embodiment of the present invention aims at the fact that the shape of the cracked plate is fixed in the prior art, and the width of the cracked plate will not change during a simulated sand laying process; and the influence of the ground stress is not considered, which has great limitations and is different from the actual There is a big discrepancy in the situation, which leads to the inaccurate problem of the obtained experimental data, and a device for simulating complex fracture sanding is provided. Such as figure 1 As shown, the de...

Embodiment 2

[0042] Figure 4 A schematic diagram of the complex fracture simulation structure provided in Example 2. On the basis of the first embodiment above, as Figure 4 As shown, each of the crack components in the complex crack simulation structure 11 includes a plurality of inlet joints 117 and a plurality of outlet joints 118, the inlet joints 117 are evenly distributed along the length direction of the frame where they are located, and the outlet joints 118 are evenly distributed along the length direction of the frame where they are located. When carrying out the experiment, the output port of the first injection pump 14 is connected to a plurality of inlet joints 117 of the main fracture assembly through the second pipeline passing through the first port, and is distributed uniformly along the length direction of the frame. The multiple inlet joints 117 can be injected with liquid, which can realize the function of simulating a wellbore without setting up a simulated wellbore...

Embodiment 3

[0050] Figure 5 It is a schematic diagram of the complex fracture simulation structure provided by the third embodiment of the present invention. On the basis of the above-mentioned embodiment one or embodiment two, as Figure 5 As shown, the complex crack simulation structure also includes at least one support rod 201, which is an adjustable length telescopic rod with locking parts, and the two ends of each support rod 201 are rotatably connected to the corresponding between two adjacent secondary split assemblies 202 and 203, or between two adjacent third-stage split assemblies rotatably connected. When the support rods 201 are locked, each of the support rods 201 rigidly connects two adjacent secondary crack components 202 and 203 , or rigidly connects two adjacent tertiary crack components.

[0051] In this embodiment, the support rod is connected to two adjacent crack surfaces through a direction-lockable universal joint, so that both ends of the support rod 201 are ro...

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Abstract

The embodiment of the invention provides a device and method for simulating complex crack sand paving. A complex crack simulation structure is arranged in confining pressure equipment, the confining pressure equipment is filled with water with preset pressure, the complex crack simulation structure contained in the confining pressure equipment is borne with pressure of the surrounding water, and accordingly the influence of ground stress on the fracturing process is simulated. In addition, two transparent flat plates of a crack assembly can slide in a sliding groove formed by a wrapping frame so that relative displacement can be generated, and when liquid is not injected into the crack assembly, a gap between the two flat plates is in a closed state under the pressure of water of the confining pressure equipment. Along with the increasing of the amount of liquid injected into the gap assembly, when the liquid pressure borne by the two flat plates in the crack assembly is larger than the pressure of water in the confining pressure equipment, the gap between the two flat plates is wider and wider, thus, the crack formation process in the actual fracturing process can be simulated, the fracturing process can be simulated more veritably, and obtained test data re more accurate.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development and research, and in particular to a device and method for simulating complex fracture sanding. Background technique [0002] my country's natural oil and gas resources are rich in reserves and have great development potential, but the rock formations where the resources are stored are deep and the geological conditions are complex, making them difficult to exploit. Hydraulic fracturing (fracturing for short) technology is one of the key technologies for the efficient and low-cost development of shale gas . In the actual fracturing process, due to the joint effect of shear slip and tension failure, a main fracture, multiple secondary fractures and tertiary fractures will be formed during the fracturing process. The width comparison of the secondary fractures and tertiary fractures Small. Due to the complexity of the shape of the fracture, in the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 马新仿张一诺邹雨时张士诚李宁陈铭李四海
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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