Method for increasing recovery rate of shale gas

A shale gas and recovery rate technology, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of low utilization efficiency and low recovery rate of shale gas, and achieve strong microwave absorption capability. , Improve the efficiency of microwave energy utilization, improve the effect of oil recovery

Inactive Publication Date: 2018-11-16
KUNMING UNIV OF SCI & TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

Existing technologies for exploiting shale gas still have the disadvantages of low utilization efficiency and low recovery rate of shale gas

Method used

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  • Method for increasing recovery rate of shale gas
  • Method for increasing recovery rate of shale gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: as figure 1 As shown, the method for enhancing shale gas recovery specifically includes the following steps:

[0028] (1) A water-bearing columnar dark mud shale sample is taken from a gas-bearing shale reservoir;

[0029] (2) Put the columnar shale sample into a pressure vessel;

[0030] (3) Use a vacuum pump to vacuumize the pressure vessel in step (2), so that the absolute pressure inside the pressure vessel is below 6 Pa, and the vacuuming time is 6 hours;

[0031] (4) Fill the pressure vessel in step (3) with 15 MPa of methane gas to promote the shale to fully absorb methane and reach the state of adsorption equilibrium;

[0032] (5) Hydraulically fracturing the columnar shale in the pressure vessel in step (4) with high-pressure water flow carrying proppant for primary exploitation of shale gas; the proppant is natural iron ore with a particle size of 20-60 mesh, the hydraulic fracturing pressure is 20 MPa, and the sand-carrying ratio is 15% (vol...

Embodiment 2

[0038] Embodiment 2: The method for enhancing shale gas recovery specifically comprises the following steps:

[0039] (1) A water-bearing columnar dark mud shale sample is taken from a gas-bearing shale reservoir;

[0040] (2) Put the columnar shale sample into a pressure vessel;

[0041] (3) Vacuumize the pressure vessel in step (2), so that the absolute pressure inside the pressure vessel is below 6 Pa, and the vacuuming time is 6 h;

[0042] (4) Fill the pressure vessel in step (3) with 18 MPa of methane gas to promote the shale to fully absorb methane and reach the state of adsorption equilibrium;

[0043] (5) The columnar shale in the pressure vessel in step (4) is subjected to hydraulic fracturing with high-pressure water flow carrying proppant for primary exploitation of shale gas. The proppant is natural iron ore with a particle size of 20-60 mesh, the hydraulic fracturing pressure is 24 MPa, and the sand-carrying ratio is 20% (volume ratio);

[0044] (6) Place the ...

Embodiment 3

[0049] Embodiment 3: the method for enhancing shale gas recovery specifically comprises the following steps:

[0050] (1) A water-bearing columnar high-carbon shale sample is taken from a gas-bearing shale reservoir;

[0051] (2) Put the columnar shale sample into a pressure vessel;

[0052] (3) Vacuumize the pressure vessel in step (2), so that the absolute pressure inside the pressure vessel is below 6 Pa, and the vacuuming time is 6 h;

[0053] (4) Fill the pressure vessel in step (3) with 21 MPa of methane gas to promote the shale to fully absorb methane and reach the state of adsorption equilibrium;

[0054] (5) Perform hydraulic fracturing of the columnar shale in the pressure vessel in step (4) with high-pressure water flow carrying proppant for primary exploitation of shale gas. The proppant is natural copper ore with a particle size of 20-60 mesh, the hydraulic fracturing pressure is 28 MPa, and the sand-carrying ratio is 25% (volume ratio);

[0055] (6) Place the ...

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Abstract

The invention discloses a method for increasing the recovery rate of shale gas. According to the method for increasing the recovery rate of the shale gas, a high-pressure water flow carried with a proppant is injected into shale for hydraulic fracturing, the shale gas is collected, then the shale is subjected to microwave irradiation through a microwave generator, the shale gas in the shale is exploited for the second time through microwaves and collected, and thus the recovery rate of the shale gas is increased. According to the method for increasing the recovery rate of the shale gas, in theprocess of exploiting the shale gas for the first time through hydraulic fracturing, a natural metal ore is utilized as the crack proppant; and the metal ore has the high microwave absorption capacity, in the process of exploiting the shale gas for the second time through microwave irradiation, the temperature of the shale containing the gas is quickly increased, meanwhile, the total amount of oxygen-containing functional groups in shale organic matters is decreased, pores in the shale are promoted to be fully exposed, after inorganic minerals in the metal ore and the shale absorb the microwaves, thermal stress is formed, then the shale is induced to be damaged, and the recovery rate of the shale gas is significantly increased. The invention provides a clean and efficient shale gas exploiting method, and further provides a utilization way of the microwaves and the metal ore.

Description

technical field [0001] The invention relates to a method for enhancing the recovery rate of shale gas, and belongs to the emerging technical field of unconventional natural gas exploitation. Background technique [0002] Traditional fossil energy such as coal and oil are important strategic resources for maintaining social and economic development. With the large-scale use of coal and oil, environmental pollution and climate change occur frequently, which pose a serious threat to the balance of the earth's ecosystem and the sustainable development of human society. Therefore, in order to alleviate and ultimately solve the problems of ecological environment deterioration and global warming, it is urgent to promote the use of clean energy on a global scale. [0003] As the most common and abundant clean energy, natural gas (mainly composed of methane) is expected to occupy a dominant position in the primary energy consumption structure. Natural gas includes conventional natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/24
CPCE21B43/2405E21B43/26E21B43/267
Inventor 张登峰付学祥贾帅秋罗翠娟李超
Owner KUNMING UNIV OF SCI & TECH
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