Flow diversion chamber capable of testing flow diversion capacity of fracture network of tight reservoir by gas and working method thereof

A technology of diversion capacity and tight reservoirs, applied in the field of diversion chambers, can solve the problems of high cost, neglect, and inability to simulate formation lithology, etc., and achieve the effects of saving costs, expanding the spread range, and improving test accuracy

Active Publication Date: 2015-04-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, marble or groove plates are mostly used to simulate fracture networks, and the lithology of marble and formation rocks is quite different, which cannot simulate the real formation lithology; under high closure pressure, the embedded damage of proppant is ignored; the flow pattern is a single linear flow , it is impossible to truly simulate the flow state of the seam network; the whole system needs to be redesigned, and the cost is high

Method used

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  • Flow diversion chamber capable of testing flow diversion capacity of fracture network of tight reservoir by gas and working method thereof
  • Flow diversion chamber capable of testing flow diversion capacity of fracture network of tight reservoir by gas and working method thereof
  • Flow diversion chamber capable of testing flow diversion capacity of fracture network of tight reservoir by gas and working method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Study vertical fractures in fracture network structures such as figure 1 Influence of the number of vertical fractures 15 on the conductivity of the fracture network. Use a cutting machine to process the shale core into a plate-shaped core with the same size, with a length of 50-60 mm, a width of 50-60 mm, and a thickness of 12-15 mm; by adding proppant or not, the number of vertical fractures is controlled. Fractures are directly closed without adding proppant; the single fracture width, proppant, and sand concentration in the fracture network are the same, and a fracture network model with different numbers of vertical fractures is assembled. By measuring the conductivity of the fracture network in different models, the influence of the number of vertical fractures on the conductivity of the fracture network can be obtained.

[0057] A diversion chamber for testing the diversion capacity of a tight reservoir fracture network for gas, comprising a test tank 4 arranged...

Embodiment 2

[0062] A diversion chamber for gas testing the conductivity of a fracture network in a tight reservoir as described in Example 1, the difference lies in that a simulated wellbore 7 is arranged through the center of the sealed bottom plate.

[0063] The thickness of the sealing top plate and the sealing bottom plate are both 10-15 mm; the thickness of the upper sealing plug is 40-50 mm; the thickness of the lower sealing plug is 20-25 mm.

[0064] A sealing groove is provided on the surface of the upper sealing plug and the lower sealing plug, and a sealing film is provided in the sealing groove, and the thickness of the sealing film is 5-7mm.

Embodiment 3

[0066] Utilize the method for testing the flow conductivity of a tight reservoir fracture network using a flow diversion chamber as described in embodiment 1 or 2, comprising the following steps:

[0067] (1) selecting formation rocks, i.e. shale or tight sandstone, and processing the formation rocks into slab cores;

[0068] (2) According to the preset fracture network structure, the slab core is cut horizontally and vertically into different small sections, and put into the test groove;

[0069] (3) Construct the number of fractures and the fracture network structure by adding proppant: that is, control the fracture width of the fracture network by adding proppant with different particle sizes or using different sanding concentrations;

[0070] (4) Install the diversion chamber, and connect the four air inlets with the air inlet of the API diversion capacity tester;

[0071] (5) Open the data acquisition and control system of the API diversion tester, pressurize the diversi...

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Abstract

The invention relates to a flow diversion chamber capable of testing the flow diversion capacity of a fracture network of a tight reservoir by gas. The flow diversion chamber can be blended with an API (American Petroleum Institute) flow diversion capacity tester, so that the cost is reduced; rocks such as an actual formation shale or tight sandstone are used for realistically simulating the formation lithology, the damage to the flow diversion capacity by the embedment of a propping agent is considered, and the fracture width and the fracture network structure are changeable; the flow type of the flow diversion chamber is radial flow but not linear flow, whether a test medium passes through all fractures in the fracture network or not cannot be ensured by the linear flow, the spread range of the test medium can be increased by the radial flow, and the accuracy of testing the flow diversion capacity can be increased.

Description

technical field [0001] The invention relates to a diversion chamber for gas testing the diversion capacity of fracture networks in tight reservoirs and a working method thereof, belonging to the field of oil and gas field development. Background technique [0002] Tight gas means that the permeability of the overlying matrix is ​​less than or equal to 0.1×10 -3 μm 2 Shale gas is a special kind of unconventional natural gas, which occurs in mudstone or shale, and has the characteristics of self-generation and self-storage, no gas-water interface, large area of ​​continuous accumulation, low porosity, and extremely low permeability ( Less than 0.001×10 -3 μm 2 ) and other features. Tight gas and shale gas single wells generally have no natural production capacity or natural production capacity is lower than the lower limit of industrial gas flow, but industrial natural gas production can be obtained under certain economic conditions and technical measures. Typically, thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B47/10E21B49/00
Inventor 温庆志高金剑罗明良刘华刘欣佳王峰王淑婷段晓飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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