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Method for improving recovery ratio of shale gas and simulation experiment method

A simulation experiment and shale gas technology, applied in chemical instruments and methods, mining fluids, earthwork drilling, etc., can solve the problems of weakening the mechanical durability of proppant particles, high cost of shale gas exploitation, and deep shale gas burial depth and other issues to achieve the effect of reducing the total cost, reducing the cost of use, and reducing consumption

Pending Publication Date: 2021-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the raw materials for the preparation of the proppant are cheap and easy to obtain, some magnesium silicates will undergo hydration reactions under the conditions of shale reservoirs and weaken the mechanical durability of the proppant particles
[0005] For my country, although shale gas reserves are abundant, the deep burial depth and low permeability of shale gas make the cost of shale gas exploitation in my country much higher than that of the United States and Canada.

Method used

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  • Method for improving recovery ratio of shale gas and simulation experiment method
  • Method for improving recovery ratio of shale gas and simulation experiment method

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Embodiment 1

[0041] The method for improving the recovery rate of shale gas in the embodiment of the present invention specifically includes the following steps: S01: FeCl 3 It is blended and dissolved in hydraulic fracturing fluid according to the preset ratio. S02: FeCl will be blended 3 hydraulic fracturing fluid injected into gas-bearing shale reservoirs. S03: Extraction of shale gas through hydraulic fracturing. The burial depth of shale gas in my country is generally deep, reaching 3000-4000m, and the shale reservoir temperature range corresponding to this burial depth range will reach 70-95°C. Therefore, the above temperature conditions will promote the full hydrolysis of FeCl3, and finally generate HCl and Fe(OH) 3 . On the one hand, the hydrolysis product HCl reacts with inorganic minerals in shale (ie, mineral dissolution), which increases the porosity of the shale matrix and the permeability of the shale reservoir, thereby strengthening the CH 4 (methane) desorption, diffus...

Embodiment 2

[0047] Such as figure 2 As shown, the simulation experiment method of the embodiment of the present invention for the method for enhancing the recovery of shale gas described above includes the following steps: S01: Take a shale sample from the gas-bearing shale reservoir. S02: Put the shale sample into a pressure-resistant container placed in a constant temperature device, and the temperature of the constant temperature device is set to 95°C. S03: Fill the pressure vessel with high pressure CH 4 Methane gas promotes the shale to fully absorb methane and reach the state of adsorption equilibrium. S04: Inject the shale sample in the pressure vessel into dissolved FeCl 3 Hydraulic fracturing fluid and perform hydraulic fracturing, FeCl in hydraulic fracturing fluid 3 The mass percentage is 35%, and the operating pressure of hydraulic fracturing is 50MPa. S05: Determination of the total desorption of methane during hydraulic fracturing using the drainage gas collection metho...

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Abstract

The invention provides a method for improving the recovery rate of shale gas. The method comprises the steps that FeCl3 is blended and dissolved in hydraulic fracturing fluid according to a preset proportion; the hydraulic fracturing fluid blended with FeCl3 is injected into a reservoir containing the shale gas; and the shale gas is exploited through hydraulic fracturing. The invention further provides a simulation experiment method. According to the method for improving the recovery rate of the shale gas, the chemical characteristic that FeCl3 is easy to hydrolyze, namely hydrolysis product HCl reacts with inorganic minerals in shale, is fully utilized; the porosity of a shale matrix and the permeability of a shale reservoir are improved, and then desorption, diffusion and flowing of CH4 from high-carbon mud shale are enhanced; the hydrolysis product Fe (OH)3 is easy to decompose at 95 DEG C, and Fe2O3 is generated; and Fe2O3 is relatively high in hardness and can be used as a propping agent for supporting fresh cracks formed by hydraulic fracturing, so that desorption, diffusion and flowing of CH4 are promoted, and the recovery rate of the shale gas in the shale reservoir is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of shale gas recovery, in particular to a method for increasing the recovery rate of shale gas and a simulation experiment method thereof. Background technique [0002] Shale gas (mainly composed of CH4) is an emerging unconventional natural gas resource. Promoting the use of shale gas is of great significance for optimizing my country's current energy consumption structure, alleviating the supply pressure of the natural gas market, and promoting energy conservation, emission reduction, and pollution prevention and control. Therefore, it is of great strategic significance to develop clean and efficient shale gas extraction technologies. A large number of studies have shown that the main forms of shale gas in shale reservoirs include: free compressed gas in pores and fractures; adsorbed gas on the surface of organic matter and inorganic minerals; dissolved gas in asphaltenes, kerogen, liquid hydrocarbons, an...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B43/28C09K8/80C09K8/72
CPCE21B43/26E21B43/267E21B43/283C09K8/72C09K8/80
Inventor 伦增珉赵春鹏龙胜祥王海涛骆铭
Owner CHINA PETROLEUM & CHEM CORP