Large true tri-axial physical model test method for researching thin interbed fracturing fracture extension principle

A test method and technology of thin interlayers, applied in the direction of earthwork drilling, production fluids, wellbore/well components, etc., which can solve the problem that horizontal two-way stress cannot be layered, cannot apply separate two-way stress in thin interlayers, and cannot. Research on the law of crack propagation in thin interbedded layers, etc., to achieve the effect of improving the development effect

Active Publication Date: 2017-08-18
PETROCHINA CO LTD
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Problems solved by technology

[0003] At present, there are two main problems in the conventional triaxial stress loading method. One is that the size of the test piece is small, generally tens of millimeters to 600mm. Due to the small size of the model, the error of the research results is large, and

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  • Large true tri-axial physical model test method for researching thin interbed fracturing fracture extension principle
  • Large true tri-axial physical model test method for researching thin interbed fracturing fracture extension principle

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Embodiment 1

[0027] Such as figure 1 As shown, a large-scale true triaxial phantom test method for studying the extension law of thin interlayer fracturing cracks provided by the embodiment of the present invention includes the following steps:

[0028] Step 101, obtaining the three-dimensional in-situ stress and rock mechanics parameters of the real geological core under formation conditions;

[0029] Step 102, establishing a physical model 1 for simulating a real thin interlayer;

[0030] Step 103, checking the coincidence rate of the physical parameters of the physical model 1 and the physical parameters of the real geological core, if the coincidence rate is qualified, then proceed to step 104; if the coincidence rate is not qualified, then repeat step 102 until the coincidence rate is qualified;

[0031] Step 104, load confining pressure on the physical model 1 according to the three-dimensional ground stress tested in step 101, and perform a hydraulic fracturing test;

[0032] Step...

Embodiment 2

[0035] On the basis of Embodiment 1, in the step 101, the method for obtaining the real geological core is an existing method, which will not be described in detail again.

[0036] The real geological core is a full-diameter core. Full-diameter cores refer to cores taken from oil (gas) layers by coring technology, without cutting and splitting, and the entire section is used for laboratory analysis to determine relevant parameters of the columnar core.

[0037] The shape of the real geological core is a cylinder with a height of 50mm and a diameter of 25mm, and the shape of this size is adopted to adapt to the shape of the triaxial compression test machine. The triaxial compression testing machine is a device used to test the three-dimensional in-situ stress and rock mechanics parameters of real geological cores under formation conditions. The triaxial compression testing machine is an existing device and will not be described here. Among them, rock mechanics parameters inclu...

Embodiment 3

[0044] On the basis of Example 1, the process of checking the physical model 1 is carried out indoors. Specifically, the model rock core is obtained by drilling on the physical model 1, and the physical parameters of the model rock core are tested. After the test, the physical parameters of the model rock core are compared. The coincidence rate of the physical parameters and the physical parameters of the real geological core, if the coincidence rate is greater than or equal to 95%, it is qualified, then proceed to step 104; if the coincidence rate is less than 95%, it is unqualified, then repeat step 102 until the coincidence rate qualified.

[0045] Among them, the physical parameters to be tested for the model core include Young's modulus and Poisson's ratio, and the testing methods are existing methods, which will not be described in detail here.

[0046] Wherein, in step 103, one model core needs to be obtained on each thin interbed 3, and each model core is tested, and t...

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Abstract

The invention relates to the technical field of oil and gas well production increment, in particular to a large true tri-axial physical model test method for researching a thin interbed fracturing fracture extension principle. The method comprises five steps that the three dimensional in-situ stress size and rock mechanical parameters of a true geological core are obtained; a physical model for simulating a true thin interbed is built; the physical model is tested; the confining pressure is loaded on the physical model, and a hydraulic fracturing test is conducted; and the fracture shape of the physical model is subjected to quantitative analysis, and the fracture extension principle is researched. All test factors of the method approximate the true geological conditions, the thin interbed oil reservoir hydraulic fracturing fracture extension principle can be mastered through the method, thin interbedded reservoir transformation is guided, and the developmental effect of an oil reservoir is greatly improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas well stimulation, in particular to a large-scale true triaxial physical modeling test method for studying the extension law of thin interlayer fracturing fractures. Background technique [0002] The physical simulation test method is an important method for the study of fracture extension law. It is used to understand the complex fracture shape law of different reservoirs under different process conditions, guide on-site construction, and improve the technical level of oilfield development and completion. [0003] At present, there are two main problems in the conventional triaxial stress loading method. One is that the size of the test piece is small, generally tens of millimeters to 600mm. Due to the small size of the model, the error of the research results is large, and the complex crack system cannot be studied. The second is that the loaded horizontal two-dimensional stress cannot be del...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 李川赵振峰李宪文张矿生唐梅荣王成旺张翔殷桂琴李昌恒徐创朝
Owner PETROCHINA CO LTD
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