Unlock instant, AI-driven research and patent intelligence for your innovation.

Simulation sample preparation method and device for hydraulic fracturing test of broken soft coal seam

A technology for simulating samples and hydraulic fracturing, which can be used in mining equipment, surveying, earthwork drilling and mining, etc. It can solve problems such as interfering with test results, wrong test rules, and inability to reflect the characteristics of layered sedimentary structures of natural sedimentary rocks.

Active Publication Date: 2022-03-18
CHINA UNIV OF MINING & TECH +1
View PDF22 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the simulated samples prepared in the laboratory are generally artificially poured with concrete and other materials. The thickness and flatness of different structural layers of each sample produced by this method are different, and the samples cannot reflect natural sedimentary rocks. Structural features of layered deposition
In addition, the actual experimental results depend on the standardization of the simulated samples, and the differences of each sample due to manual production may have a great impact on the test results, which will interfere with the relationship between the test results of each sample and hinder the establishment of test rules. Explore, or get wrong experimental laws

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Simulation sample preparation method and device for hydraulic fracturing test of broken soft coal seam
  • Simulation sample preparation method and device for hydraulic fracturing test of broken soft coal seam
  • Simulation sample preparation method and device for hydraulic fracturing test of broken soft coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Use a mass ratio of 80% coal powder, 5% fine sand, 15% cement and water to form a coal seam slurry, use a mass ratio of 60% gypsum, 20% fine sand, 20% cement and water to form a coal seam The interface slurry is mixed with 60% fine sand, 40% cement and water to form the roof slurry, and then the coal seam slurry, coal seam interface slurry and roof slurry are placed in separate containers.

Embodiment 2

[0050] Example 2: Use a mass ratio of 70% coal powder, 10% fine sand, 20% cement and water to form a coal seam slurry, use a mass ratio of 50% gypsum, 25% fine sand, 25% cement and water to form a coal seam For the interface slurry, use a mass ratio of 65% fine sand, 43% cement and water to form a roof slurry, and then put the coal seam slurry, coal seam interface slurry and roof slurry in separate containers.

Embodiment 3

[0051] Example 3: Use a mass ratio of 60% coal powder, 15% fine sand, 25% cement and water to form a coal seam slurry, use a mass ratio of 40% gypsum, 30% fine sand, 30% cement and water to form a coal seam The interface slurry is mixed with 70% fine sand, 30% cement and water to form the roof slurry, and then the coal seam slurry, coal seam interface slurry and roof slurry are placed in separate containers.

[0052] In the above-mentioned embodiment, different slurries are pre-mixed first, and then the mixed slurries are filled three times in a horn-shaped slump barrel with an upper opening of 100 mm, a lower opening of 200 mm, and a height of 300 mm. After filling, use a tamping hammer to hit 25 times from outside to inside evenly along the wall of the barrel. After compacting, smooth it out, and then pull up the barrel. The slurry will collapse due to its own weight. Use the height of the barrel to subtract the height of the highest point of the slurry after the collapse. T...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of coalbed methane exploitation simulation test, in particular to a method for making a simulated sample for hydraulic fracturing testing of broken soft coal seams, including the following slurry preparation process: using coal powder, fine sand, cement and water to form a Coal seam slurry, use gypsum, fine sand, cement and water to mix to form coal seam interface slurry, use fine sand, cement and water to mix to form roof slurry, then put the coal seam slurry, coal seam interface slurry and roof slurry respectively in a separate container. The present invention can control and manufacture different samples with a unified process so that they have consistent dimensions and structural layer characteristics. In different confining pressure fracturing tests, the influence of the sample making itself on the experimental results can be reduced, thus enabling Feedback more accurately the impact of external controllable factors on the direction of the experimental results, and then assist the experimenters to obtain the experimental rules and practical experience that can effectively guide the mining of coalbed methane.

Description

technical field [0001] The invention relates to the technical field of coalbed methane mining simulation tests, in particular to a simulation sample preparation method and device for hydraulic fracturing tests of broken soft coal seams. Background technique [0002] The basic principle of hydraulic fracturing is to pump a large amount of high-pressure liquid mixed with proppant into the reservoir through the wellbore, forcing the reservoir to rupture and form artificial fractures, so that the proppant can fill and support the fractures and improve the porosity and permeability of the reservoir. [0003] Fractured, soft and low-permeability coal seams have always been regarded as restricted areas for surface coalbed methane extraction. Fracturing vertical wells generally have low single-well production, short stable production period, fast attenuation, and low extraction rate. The extraction technology has not yet made a breakthrough. Therefore, according to the characteristi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/26E21B43/267E21B47/00E21F17/00E21F17/18
CPCE21B43/006E21B43/26E21B43/267E21B47/00E21F17/18E21F17/00
Inventor 程翔平立华吴财芳巫修平王可新汤楷包宏亮
Owner CHINA UNIV OF MINING & TECH