True tri-axial hydraulic fracture test machine and test method

A hydraulic fracturing and true triaxial technology, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the problems of inconvenient maintenance, broken deformation, large triaxial pressure difference, etc., to achieve The effect of low physiological inertia, high compression resistance, and low viscosity-temperature coefficient

Inactive Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the triaxial confining pressure device for simulating the stress state of the formation rock and the injection device for simulating the fracturing process are controlled by two independent systems, which cannot be coordinated and controlled on the same platform. , the lack of unified monitoring measures, which not only increases the operating procedures, affects the efficiency of the experiment, but also brings certain safety hazards; on the other hand, the hydraulic pressure source with triaxial confining pressure is pressurized in the form of a plunger pump During the operation, the pressurization rate cannot be effectively controlled, resulting in excessive triaxial pressure difference of the rock mass, causing crushing and deformation, and affecting the experimental results; in addition, the disassembly and assembly of the oil-water separator is not easy to operate, and there are certain difficulties in replacing the fracturing fluid
[0003] With the deepening of the research scope of oil and gas reservoirs, the existing equipment can no longer meet the requirements of the experimental parameters, and there are many control lines and high-pressure pipelines connected between the equipment, which bring certain safety hazards and are not easy to maintain

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  • True tri-axial hydraulic fracture test machine and test method
  • True tri-axial hydraulic fracture test machine and test method
  • True tri-axial hydraulic fracture test machine and test method

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Experimental program
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Embodiment 1

[0051] Such as figure 1 As shown, according to an embodiment of the true triaxial hydraulic fracturing testing machine of the present invention, it includes a confining pressure system 1, an injection system 2 and a true triaxial test frame 3, the confining pressure system 1 and the injection system 2 Connected with the true triaxial test frame 3, the downhole core 4 is placed in the true triaxial test frame 3; the injection system 2 and the confining pressure system 1 are connected with a computer 5, and the injection system 2 includes fracturing A fluid container I 201 , a fracturing fluid container II 202 and a piston container 203 . The fracturing fluid container II 202 is equipped with a stirring mechanism 204 connected to the computer 5 .

[0052] The fracturing fluid container and the injection container (that is, the piston container) of the true triaxial hydraulic fracturing testing machine of this embodiment are designed separately, which facilitates replacement of f...

Embodiment 2

[0067] According to another embodiment of the true triaxial hydraulic fracturing testing machine of the present invention, its structure, connection relationship between components, working principle and beneficial effects are all the same as those of the first embodiment. Using the testing machine of this embodiment to carry out another embodiment of the true triaxial hydraulic fracturing test method, it includes the following steps in sequence:

[0068] Step 1: Close all switch valves and drain valves, inject clean water and additives into the fracturing fluid container II in a certain proportion, set the stirring time, and start the stirring mechanism to stir to form a uniform fracturing solution;

[0069] Step 2: Open the on-off valve III and the on-off valve IV first, and then open the high-pressure gas cylinder. At this time, the fracturing solution enters the cavity above the piston plate in the piston container;

[0070] Step 3: After all the fracturing solution enters...

Embodiment 3

[0079] According to another embodiment of the true triaxial hydraulic fracturing testing machine of the present invention, its structure, connection relationship between various components, working principle and beneficial effects are the same as those of Embodiment 2, the difference is: the fracturing fluid container The size of the pipeline connected between II and the piston container, and between the piston container and the downhole core should be large enough to ensure the smooth injection of sand-carrying fracturing fluid into the downhole core.

[0080] Using the testing machine of this embodiment to carry out another embodiment of the true triaxial hydraulic fracturing test method, the process steps are the same as in the second embodiment, except that the clear water and additives in step one are replaced with fracturing fluid and proppant . The fracturing fluid and proppant are injected into the fracturing fluid container II according to a certain ratio, the stirrin...

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Abstract

The invention relates to a true tri-axial hydraulic fracture test machine which comprises a confining pressure system, an injection system and a true tri-axial test stand, wherein the injection system comprises a fracturing solution container I, a fracturing solution container II and a piston container, and a stirring mechanism is mounted in the fracturing solution container II. A test method comprises the following steps: injecting clear water and an additive into the fracturing solution container II according to a certain proportion, and starting the stirring mechanism to stir; injecting a fracturing solution into a cavity body above a piston plate in the piston container by utilizing pressure; respectively applying confining pressures onto three axial directions of a downhole rock core simultaneously through three high-pressure advection pumps; draining into a cavity body under the piston plate in the piston container through a constant-pressure constant-speed plunger pump I and / or a constant-pressure constant-speed plunger pump II; injecting the fracturing solution into the rock core to start to fracture and taking out the downhole rock core after the end of fracturing to observe fracture expansion condition. The true tri-axial hydraulic fracture test machine provided by the invention has the benefits that the technical scheme is simple and easy to understand, the operation is convenient and fast, the unified control of the confining pressure system and the injection system can be realized, and the fracturing solution is convenient to replace.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a true triaxial hydraulic fracturing test machine and a test method thereof. Background technique [0002] During the development of oil and gas reservoirs, due to the low-permeability geological characteristics of the reservoirs, the migration of oil and gas is hindered. At this time, hydraulic fracturing has become an important means for the efficient development of such reservoirs. Through hydraulic fracturing, a complex large-scale fracture network with high conductivity can be formed, thereby increasing the drainage area of ​​oil and gas and reducing the flow resistance of oil and gas in the reservoir. Therefore, indoor physical simulation experiments are carried out to study the crack initiation and expansion behavior of fractures. is of great significance. The true three-axis experimental device in the prior art is mainly composed of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
CPCG01N3/12G01N2203/0019G01N2203/0048G01N2203/0066
Inventor 侯冰郭小锋张儒鑫谭鹏陈勉金衍林伯韬卢运虎周舟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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