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Device and method for simulating volume fracturing of horizontal well on shale reservoir stratum

A technology for simulating reservoirs and shale reservoirs, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of large construction scale, lack of simulation devices and methods, and lack of experimental devices, and achieve reliable device principles and practical methods. Feasible, the effect of optimizing the construction parameters

Active Publication Date: 2012-07-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large-scale fracturing operation of horizontal wells in shale reservoirs, and the fractures are several kilometers underground, it is impossible to observe the initiation and extension of fractures, and it is impossible to accurately obtain data such as the density of fracture networks and the volume of reservoir stimulation, and it is also impossible to analyze The seepage law of oil and gas in shale reservoirs and the impact of fracture network on productivity, therefore, it is necessary to apply experimental methods to simulate the volume fracturing of horizontal wells in shale reservoirs
At present, shale fracturing at home and abroad is mainly based on theoretical research, and there is a lack of relevant simulation devices and methods.
The main problems are: 1. There is a lack of experimental equipment capable of simulating the physical properties of shale reservoirs and underground conditions. The experimental medium is mainly quartz sand or rock outcrops, which are quite different from shale reservoirs; 2. There is a lack of equipment capable of simulating A device for staged fracturing of horizontal wells, especially a device capable of simulating more than 20 stages; 3. The density of the fracture network and the volume of fracturing in shale reservoirs can be measured without detection; 4. It cannot simulate the perforation diameter of horizontal wells, Effect of Density and Phase on Fracture Initiation, Propagation, and Productivity of Fractured Wells

Method used

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  • Device and method for simulating volume fracturing of horizontal well on shale reservoir stratum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 is the device used for simulating the shale reservoir pressure fracture expansion process; embodiment 3 is the device used for simulating the production process of shale oil reservoir; embodiment 5 is the device used for simulating the production process of shale gas storage reservoir .

[0057] Embodiment 1,

[0058] A device for simulating volume fracturing of a horizontal well in a shale reservoir, comprising a simulated reservoir cavity, a data acquisition control panel 20, a computer 21, a horizontal wellbore 9 set in the simulated reservoir cavity, the data acquisition control panel 20 is connected to the computer 21; the simulated reservoir chamber includes an upper cover 27 and a rectangular cavity 28, and the upper cover 27 is sealed on the rectangular cavity 28 by bolts;

[0059] The simulated reservoir cavity is installed on the universal support 12, which is composed of four height-adjustable pillars. By adjusting the height of each pillar, th...

Embodiment 2

[0066] Utilize the device described in embodiment 1 to simulate the shale reservoir pressure fracture expansion process, carry out according to the following steps,

[0067] (1) According to the similarity criterion, select a horizontal wellbore 9 with a certain length and steel grade, and select the perforation hole 26 of the horizontal wellbore 9 according to the perforation requirements, perforation density and shot Hole phase angle; the valve 7 at the liquid inlet of the supply source is closed and set, and the liquid storage tank 1 is communicated with the liquid inlet 17 of the horizontal wellbore through the pipeline 15;

[0068] (2) Add the sand-carrying liquid in the liquid storage tank 1, and the sand-carrying liquid in the liquid storage tank 1 is passed into the horizontal wellbore 9 at a low speed along the pipeline 15 and the horizontal wellbore liquid inlet 17, and check the pipeline 15 and the cavity of the simulated reservoir tightness;

[0069] (3) connect f...

Embodiment 3

[0075] The device for simulating volume fracturing of horizontal wells in shale reservoirs as described in Example 1, the difference lies in:

[0076]According to this embodiment, when simulating the production process of the shale oil reservoir, the liquid storage tank is connected to the liquid inlet 16 of the supply source through the pipeline 15, and the liquid inlet 17 of the horizontal wellbore is connected to the atmosphere; An artificial fracture model 10 is set at the perforation hole 26, so that the artificial fracture model 10 communicates with the perforation hole 26; the artificial fracture model is a horizontal well transverse fracture model, a longitudinal fracture model, an oblique fracture model or a distorted fracture model. The size (radius, width) of the artificial fracture model is determined according to the needs of the experiment, and the number of artificial fractures ranges from a few to dozens. The simulated reservoir cavity is installed on the unive...

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Abstract

The invention relates to a device and a method for simulating volume fracturing of a horizontal well on a shale reservoir stratum; when crack propagation of the shale reservoir stratum is simulated, a valve at a liquid inlet of a supply source is set to be closed, and a fluid reservoir is communicated with a liquid inlet of a horizontal shaft by a pipe line; when the production process of the shale reservoir stratum is simulated, the fluid reservoir is communicated with the liquid inlet of the supply source by the pipe line, and the liquid inlet of the horizontal shaft is communicated with the atmosphere; a man-made fracture model is arranged at a bullet hole of the horizontal shaft; when the production process of the shale reservoir stratum is simulated, a gas tank is communicated with the liquid inlet of the supply source by a gas pipeline, and the liquid inlet of the horizontal shaft is communicated with the atmosphere. According to the invention, according to the similarity principle, the crack initiation and extending processes of the volume fracturing can be simulated, the density and the volume of a fracture network are determined, the effect of crack parameters on the fracturing capacity of the horizontal well on the shale reservoir stratum is researched, fracturing construction parameters and the crack parameters are optimized and a key problem of fracturing of the shale reservoir stratum is solved.

Description

technical field [0001] The invention relates to a device and method for simulating volume fracturing of horizontal wells in shale reservoirs, and belongs to the technical field of unconventional oil and gas resource development. Background technique [0002] Shale oil and gas belongs to unconventional oil and gas resources. Due to the low permeability of shale reservoirs (nano-Darcy level), the oil and gas seepage resistance is high, and there is usually no natural production capacity. Fracturing measures are required to be effectively exploited. However, the field fracturing test is difficult to construct, the downhole situation is complex, and the same layer cannot be repeated for multiple tests, so the simulation study of the fracturing process is required indoors. CN201724868U (CN201020283533.2) provides an indoor device for simulating a hydraulic fracturing process, which is a test device for indoor simulating the process of rock fracturing under liquid pressure under f...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 温庆志罗明良胡蓝霄刘广忠于姣姣齐宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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