Fixed-area controllable staggered oriented perforating horizontal well hydraulic fracturing physical simulation method

A technology of directional perforation and physical simulation, applied in the direction of applying stable tension/pressure to test material strength, earthwork drilling, wellbore/well components, etc. Issues such as the influence of perforation azimuth are not considered

Inactive Publication Date: 2021-01-26
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process takes full account of the influence of perforation azimuth angle on hydraulic fracture propagation. However, the perforation between each section of this process adopts side-by-side simulation devices, that is, the phase angle between each perforation hole is zero, and inevitably There will be serious stress interference between adjacent perforations, resulti

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  • Fixed-area controllable staggered oriented perforating horizontal well hydraulic fracturing physical simulation method

Examples

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Example Embodiment

[0050]Example one

[0051]Such asfigure 1As shown, this embodiment discloses a simulated wellbore, which includes a wellbore head 1 and a wellbore 2 which are connected to each other. The wellbore 2 is provided with a plurality of perforation groups along its axial direction. The perforation groups are distributed in the simulation The middle position of the wellbore ensures that the part of the wellbore 2 with perforation holes is located in the center of the artificial core.

[0052]The simulated wellbore also includes a plurality of liquid injection pipes 3, all of which are partially inserted into the wellbore 2 from the outside to the inside. Each perforation perforation group corresponds to an injection tube 3, and each injection tube 3 injects liquid for its corresponding perforation perforation group.

[0053]The outer diameter of the wellbore head 1 is 20mm, the inner diameter is 18mm, and the height is 30mm; the outer diameter of the wellbore 2 is 14mm, the inner diameter is 12.8mm...

Example Embodiment

[0057]Example two

[0058]This embodiment discloses a physical simulation method for hydraulic fracturing of a horizontal well with controlled staggered directional perforation in a fixed area, which includes the following steps:

[0059]S1. Make a simulated wellbore. There are multiple perforation groups on the simulated wellbore. Each perforation group corresponds to a liquid injection pipe 3. The perforation group includes multiple perforation holes, and paper is used to make perforation channels. Insert the perforation tunnel into the perforation hole;

[0060]S2. Place the simulated wellbore in the mold, pour the mixture of cement and quartz sand into the mold, and remove the mold after drying to obtain an artificial core specimen;

[0061]S3. Put the test piece and simulated wellbore into the loading chamber of the true three-axis physical simulation testing machine;

[0062]S4. Connect the injection pump to a injection pipe 3 of the simulated wellbore;

[0063]S5. Load the ground stress in the...

Example Embodiment

[0067]Example three

[0068]This embodiment discloses a physical simulation method for hydraulic fracturing of a horizontal well with controlled staggered directional perforation in a fixed area, which includes the following steps:

[0069]S1. Make a simulated wellbore. The simulated wellbore is provided with multiple perforation perforation groups along its axial direction. Each perforation perforation group corresponds to a liquid injection pipe 3. The perforation perforation group includes multiple perforation perforations. The perforation channel is inserted into the perforation hole; the simulated wellbore is the one in the first embodiment. The length of the perforation channel is 20mm-40mm, and the perforation channel is inserted into the second perforation hole 22 to adjust and control the angle of the fracturing fluid sprayed by the second perforation hole 22. The perforation tunnel is made of A4 paper.

[0070]S11. Make a test piece mold, where the size of the mold is selected to b...

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Abstract

The invention relates to the technical field of unconventional oil and gas resource development, and discloses a fixed-area controllable staggered oriented perforating horizontal well hydraulic fracturing physical simulation method. The fixed-area controllable staggered oriented perforating horizontal well hydraulic fracturing physical simulation method comprises the steps that S1, a simulation shaft is manufactured, the simulation shaft is provided with a plurality of perforating hole sets, each set corresponds to a liquid injection pipe, and the simulation shaft comprises a plurality of perforating holes, and perforating hole channels are manufactured and are inserted into the perforating holes; S2, the shaft is put into a mold, and pouring is carried out to obtain an artificial rock core test piece; S3, the artificial rock core test piece is put into a loading chamber; S4, a liquid injection pump is connected to the liquid injection pipe; S5, crustal stress is loaded in the X, Y andZ directions of the test piece, fracturing fluid is injected into the simulation shaft, data are synchronously acquired, and the crustal stress on the test piece is canceled; S6, the liquid injectionpump is connected to the next liquid injection pipe, then the step S5 is repeated till all the liquid injection pipes are injected with liquid, and then the step S7 is carried out; and S7, sectioningis carried out on the test piece, and a fluid migration channel in the test piece is observed to obtain a hydraulic fracturing crack propagation rule.

Description

technical field [0001] The invention relates to the technical field of development of unconventional oil and gas resources, in particular to a physical simulation method for hydraulic fracturing of horizontal wells with fixed-area controllable staggered perforation and directional perforation. Background technique [0002] Conventional oil and gas resources have been gradually depleted, and the amount of exploitation can no longer meet the current society's demand for energy. Due to the abundant reserves of unconventional oil and gas, its development and utilization have attracted more and more attention and attention from all over the world. However, unconventional oil and gas reservoirs are characterized by tightness, strong heterogeneity, large burial depth, and high stress difference in some areas. The current conventional hydraulic fracturing technology often cannot meet the requirements of efficient and stable development of unconventional oil and gas resources. [00...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/11E21B43/30E21B47/00E21B49/00G01N3/12
CPCE21B43/11E21B43/26E21B43/30E21B47/00E21B49/00G01N3/12G01N2203/0048G01N2203/0256G01N2203/0298
Inventor 田福春李玉伟龙敏贾云鹏赵玉东石林刘学伟闫阳构小婷杨立永尹顺利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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