Quantitative analysis method for pore volume increments of hydrated shale in different scales

A pore volume and quantitative analysis technology, applied in the field of oil and gas exploration and development, can solve the problems of inaccurate guidance of actual production and inability to accurately reflect the influence of "boiled well pores", so as to improve seepage capacity, increase effective pore volume, and increase the number of gas wells The effect of capacity

Active Publication Date: 2020-12-25
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the test methods for shale pore changes in the prior art cannot accurately reflect the influence of the "simmering well" operation on the pores, and cannot accurately guide actual production, thereby providing a water Quantitative analysis method for pore volume increment of different scales in chemical shale

Method used

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  • Quantitative analysis method for pore volume increments of hydrated shale in different scales
  • Quantitative analysis method for pore volume increments of hydrated shale in different scales
  • Quantitative analysis method for pore volume increments of hydrated shale in different scales

Examples

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Embodiment 1

[0048] This example provides a quantitative analysis method for pore volume increment of different scales of hydrated shale, and the specific steps are as follows:

[0049] 1. Determination of water and absolute ethanol T per unit mass (1g) by nuclear magnetic resonance 2 Spectrum, T 2 The spectrum signal amplitude values ​​are 915 and 1182 respectively, and the conversion coefficient of the two is determined to be 1:1.3; the signal quantities corresponding to absolute ethanol and water in a calibrated unit volume (1mL) are S 1 and S 2 . In this experiment, the signal quantities corresponding to a unit volume of absolute ethanol and water are respectively S 1 = 24472 and S 2 =28623.

[0050] 2. Prepare standard rock samples in the target shale area by wire cutting. In this example, the shale rock samples come from three different shale gas wells in the Yongchuan area of ​​western Chongqing, respectively labeled 1#, 2#, 3#, rock The sample size is Φ25×50mm. Then dry the ...

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Abstract

The invention belongs to the technical field of oil-gas exploration and development, and particularly relates to a quantitative analysis method for pore volume increments of hydrated shale in different scales. According to the quantitative analysis method for the pore volume increments of the hydrated shale in different scales, saturation of a standard rock sample is carried out by adopting a first solvent which does not generate hydration reaction with the shale, data of original effective pore volume is obtained through testing, and then saturation testing is carried out by adopting water; and therefore, real change data of pores of different scales after shale hydration can be obtained. The method can quantitatively evaluate the absolute increase amplitude of the effective pore volumesof different scales in the shale under the hydration effect, and has practical significance for guiding field screening of shale reservoirs suitable for production increase of after-fracturing "soaking".

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a quantitative analysis method for pore volume increments of different scales of hydrated shale. Background technique [0002] Shale is an important unconventional natural gas resource. The exploration and development of shale gas can greatly relieve the pressure on natural gas demand and improve energy structure and energy security. Hydraulic fracturing is one of the key technologies for the successful development of shale gas reservoirs. Different from conventional oil and gas reservoirs, field experience has proved that some shale gas well reservoirs are shut down for a period of time after hydraulic fracturing (that is, the "simmering" stage after fracturing), and then flowback of fracturing fluid can effectively increase the productivity of shale gas wells. The production stimulation mechanism of shale gas well "boiled well" is no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08G01N15/08G01N1/44
CPCG01N24/081G01N15/088G01N1/44Y02A90/30
Inventor 林魂杨兵宋西翔孙新毅曲海
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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