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Fracture simulation method for fractured tight sandstone oil-gas reservoir

A technology of tight sandstone and simulation method, which is applied in the field of fractured oil and gas reservoirs in oil exploitation, and can solve the problems of single simulation and difficulty in controlling the mixing ratio of sand with different meshes

Active Publication Date: 2018-11-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the gasket method is simple and easy to implement, but its disadvantage is that it can only simulate large-scale cracks, and the simulation of crack shape is too simple; the difficulty of the sand mixing method is that it is difficult to control the mixing ratio of different mesh sands

Method used

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  • Fracture simulation method for fractured tight sandstone oil-gas reservoir
  • Fracture simulation method for fractured tight sandstone oil-gas reservoir
  • Fracture simulation method for fractured tight sandstone oil-gas reservoir

Examples

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example 1

[0084] Example 1: Under the condition of 10MPa confining pressure, the crack opening and permeability of 1-layer gauze

[0085] In this embodiment, the physical model used in the experiment is a 1-layer gauze mesh fractured core model. Under the condition of 10MPa confining pressure, the experimental results of the 1-layer gauze mesh crack opening and permeability are shown in Table 1 and image 3 , Figure 4 shown. Under the condition of 10MPa confining pressure and 60℃, the crack opening of the first layer of gauze is 0.08mm, and the permeability is 4.29mD. Among them, the pump speed was set to 0.2ml / min and 0.4ml / min respectively, and the permeability of the cracks in the first layer of gauze was measured to be 4.2mD and 4.4mD respectively, with an average of 4.29mD.

[0086] Table 1 Experimental results of cracks in 1-layer gauze

[0087]

[0088] image 3 and Figure 4 Shown are the inlet pressure curves at different flow rates: at a flow rate of 0.2ml / min, the in...

example 2

[0089] Example 2: Under the condition of 10MPa confining pressure, the crack opening and permeability of 3 layers of gauze

[0090] In this example, the physical model used in the experiment is a 3-layer gauze fractured core model. Under the condition of 10MPa confining pressure, the experimental results of the 3-layer gauze crack opening and permeability are shown in Table 2 and Figure 5 , Image 6 shown. Under the conditions of 10MPa confining pressure and 60℃, the thickness of the crack in the three-layer gauze is 0.24mm, and the permeability is 87.865mD. Among them, the pump speed was set to 0.2ml / min and 0.4ml / min respectively, and the permeability of the cracks in the three layers of gauze was measured to be 75.97mD and 99.76mD respectively, with an average of 87.865mD.

[0091] Table 2 Experimental results of cracks in 3-layer gauze

[0092]

[0093] Figure 5 and Image 6 The inlet pressure curves at different flow rates are shown respectively: under the flow ...

example 3

[0094] Example 3: Under the condition of 10MPa confining pressure, the crack opening and permeability of 5 layers of gauze

[0095] In this example, the physical model used in the experiment is a 5-layer gauze fractured core model. Under the condition of 10MPa confining pressure, the experimental results of the 5-layer gauze crack opening and permeability are shown in Table 3 and Figure 7 , Figure 8 shown. Under the conditions of 10MPa confining pressure and 60℃, the thickness of the crack in the 5-layer gauze is 0.42mm, and the permeability is 295.42mD. Among them, the pump speed was set to 0.2ml / min and 0.4ml / min respectively, and the permeability of the cracks in the five layers of gauze was measured to be 308.64mD and 282.19mD respectively, with an average of 295.42mD.

[0096] Table 3 Experimental results of cracks in 5-layer gauze

[0097]

[0098]

[0099] Figure 7 and Figure 8 The inlet pressure curves at different flow rates are shown respectively: at a...

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Abstract

The invention discloses a fracture simulation method for a fractured tight sandstone oil-gas reservoir. The method is characterized by comprising the following steps: step one: pressing a core model and laying gauze elements with different layer numbers at the middle part of the core model to simulate different fracture apertures; step two: determining the relationship between the gauze elements with different layer numbers and the fracture apertures; step three: determining the relationship between different placement directions of the gauze elements in the core model and the fracture strike;step four: determining the relationship between different layer numbers of the gauze elements and the fracture permeability. The method disclosed by the invention can simulate fractures with different fracture apertures, different branch numbers and different strikes in fractured oil and gas reservoirs; the simulated minimum fracture aperture can reach 0.08mm which fully reaches the micro-fracture level, while the maximum fracture aperture can be set according to needs; meanwhile, the matrix permeability can be as low as 0.1*10<-3>mu m<2> which reaches the ultra-low permeability level of a tight oil reservoir matrix, so that indoor simulation requirements of actual production conditions in the oil reservoir are met.

Description

technical field [0001] The invention relates to a fracture simulation method for fractured tight sandstone oil and gas reservoirs, belonging to the field of fractured oil and gas reservoirs in oil exploitation. Background technique [0002] At present, fractured oil and gas reservoirs have become an important type of oil and gas reservoirs in the development of oil and gas fields in the world, and their reserves and oil production account for a considerable proportion. Complex fractured oil and gas reservoirs of different scales exist widely, such as the Asmari limestone reservoir in Iran, the carbonate reservoir in Mexico, and the Atlantic White Sacred Rock reservoir. In my country, the fractured oil and gas reservoirs are mainly low-permeability sandstone fractured reservoirs, carbonate rock fractured reservoirs and volcanic rock fractured reservoirs. As of 2016, the proven geological reserves of fractured oil and gas reservoirs in my country were 100×10 8 Above t, typic...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N1/28
CPCG01N1/286G01N33/24
Inventor 赵凤兰鲁国用侯吉瑞郝宏达
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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