Full-diameter shale reservoir core bedding fracture hydration strength experimental evaluation method

A technology for full-diameter cores and shale reservoirs, applied in the direction of strength characteristics, using stable tension/pressure to test material strength, sampling, etc. Problems such as the theory of stimulation and transformation of shale reservoirs, unfavorable shale reservoir stimulation, etc., to achieve the effect of change

Active Publication Date: 2019-11-29
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the change of the contact area between the rock pillar and the liquid and the influence of the overlying stratum and tectonic stress on the hydration intensity and law, it is impossible to deeply understand the hydration characteristics of shale gas reservoirs, and to clarify the relationship between shale gas reservoirs and conventional hydration. Sandstone reservoirs are essentially different, so they cannot enrich the theory of shale reservoir stimulation and transformation, which is not conducive to shale reservoir stimulation

Method used

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  • Full-diameter shale reservoir core bedding fracture hydration strength experimental evaluation method

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Experimental program
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Embodiment 1

[0031] An experimental evaluation method for the hydration strength of bedding fractures in a full-diameter shale reservoir core, comprising the following steps:

[0032] a. Select a full-diameter rock core with a length of 12 cm and grind the end face of the rock core;

[0033] b. Use air cooling to drill the full-diameter core in the axial direction, the hole diameter is 2.5cm, and the distance between the drilling depth and the bottom of the core is 5cm; clean the debris residue in the hole and make the hole wall smooth and clean;

[0034] c. Put the stainless steel pump liquid pipe covered with sealing rubber sleeve into the hole, confirm the distance between the stainless steel pump liquid pipe and the bottom of the hole according to the scale of the stainless steel pump liquid pipe, and calculate whether the solid-liquid contact area meets the requirements of the experimental plan;

[0035] d. Slowly pressurize the annulus of the stainless steel pump liquid pipe and the ...

Embodiment 2

[0045] An experimental evaluation method for the hydration strength of bedding fractures in a full-diameter shale reservoir core, comprising the following steps:

[0046] a. Select a full-diameter rock core with a length of 13 cm and grind the end face of the rock core;

[0047] b. Use air cooling to drill the full-diameter core in the axial direction, the hole diameter is 2.5cm, and the distance between the drilling depth and the bottom of the core is 8cm; clean the debris residue in the hole and make the hole wall smooth and clean;

[0048] c. Put the stainless steel pump liquid pipe covered with sealing rubber sleeve into the hole, confirm the distance between the stainless steel pump liquid pipe and the bottom of the hole according to the scale of the stainless steel pump liquid pipe, and calculate whether the solid-liquid contact area meets the requirements of the experimental plan;

[0049] d. Slowly pressurize the annulus of the stainless steel pump liquid pipe and the ...

Embodiment 3

[0059] An experimental evaluation method for the hydration strength of bedding fractures in a full-diameter shale reservoir core, comprising the following steps:

[0060] a. Select a full-diameter rock core with a length of 15 cm and grind the end face of the rock core;

[0061] b. Use air cooling to drill the full-diameter core in the axial direction, the hole diameter is 2.5cm, and the distance between the drilling depth and the bottom of the core is 10cm; clean the debris residue in the hole and make the hole wall smooth and clean;

[0062] c. Put the stainless steel pump liquid pipe covered with sealing rubber sleeve into the hole, confirm the distance between the stainless steel pump liquid pipe and the bottom of the hole according to the scale of the stainless steel pump liquid pipe, and calculate whether the solid-liquid contact area meets the requirements of the experimental plan;

[0063] d. Slowly pressurize the annulus of the stainless steel pump liquid pipe and the...

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Abstract

The invention discloses a full-diameter shale reservoir core bedding fracture hydration strength experimental evaluation method and belongs to the field of unconventional oil and gas exploration. Themethod is characterized by comprising the following steps that: a, a full-diameter rock core is selected; b, the full-diameter rock core is drilled along an axial direction; c, a stainless steel pumping liquid pipe sleeved with a sealing rubber sleeve is arranged into a hole; d, annulus pressurization is performed on the stainless steel liquid pumping pipe and the sealing rubber sleeve; e, vertical pressure and confining pressure are applied to the rock core simultaneously; f, liquid is injected into the stainless steel liquid pumping pipe, and a tracking pump is started to monitor pumping pressure; g, whether an experiment is to be terminated or experiment parameters are to be changed is determined; h, the rock core is taken out; i, the vertical pressure or confining pressure is changed;j, after the stainless steel pumping liquid pipe is lifted multiple times, pumping injection pressure change and pumping injection quantities monitored by the tracking pump are obtained in unit time;and k, the hydration strength of the rock core is evaluated through a gas flow ratio. With the method adopted, shale gas reservoir hydration characteristics can be deeply understood; shale reservoir yield increase transformation theories are enriched; and shale reservoir yield increase is facilitated.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas exploration, in particular to an experimental evaluation method for the hydration strength of bedding fractures in full-diameter shale reservoir cores. Background technique [0002] Hydraulic fracturing technology is a key technology for exploiting shale gas, and the complexity of the fracturing fracture network is one of the important indicators of the stimulation effect of shale reservoirs. Understand the hydration characteristics of shale gas reservoirs, clarify the essential differences between shale gas reservoirs and conventional sandstone reservoirs, including but not limited to the basic physical properties of rock mechanics, mineral components under different geological conditions, reservoir core pores-fractures The structure, development of bedding fractures, and reservoir core hydration characteristics are important prerequisites for improving the theory and technology of shale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N1/28G01N1/34
CPCG01N3/12G01N1/286G01N1/34G01N2203/0019G01N2203/0048
Inventor 杨海梁兴朱炬辉王丹李军龙尹丛彬陈明忠张俊成李子健伍洲
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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