Shale fracturing fluid forced imbibition and flowback experiment method under condition of containing adsorbed gas

An experimental method, fracturing fluid technology, applied in permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc. Consider the influence and other issues, to achieve the effect of obvious effect and improve the experimental accuracy

Active Publication Date: 2020-06-09
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The current indoor experimental methods for fracturing fluid imbibition and flowback in shale reservoirs mainly have the following two deficiencies: ① Failure to fully consider the influence of shale multi-scale seepage storage space on fracturing fluid imbibition behavior
② Failure to fully c

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  • Shale fracturing fluid forced imbibition and flowback experiment method under condition of containing adsorbed gas
  • Shale fracturing fluid forced imbibition and flowback experiment method under condition of containing adsorbed gas
  • Shale fracturing fluid forced imbibition and flowback experiment method under condition of containing adsorbed gas

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0072] Such as figure 1 As shown in the present invention, a shale fracturing fluid forced imbibition and flowback experimental method under the condition of containing adsorbed gas, the experimental device adopted includes a gas source, an intermediate container, a long core holder 10, a back pressure valve (16 , 22), control valves (6, 11, 19, 25, 26, 27, 28, 29), pipeline 7, confining pressure pump 18, vacuum pump 21, bridge instrument 24, computer 15, constant temperature system 3; the gas source is The nitrogen source 1, the gas source is connected to the intermediate container, the long core holder 10, the back pressure valve, the gas flow meter 31, and the bridge instrument 24 to the two ends of the long core holder 10 through pipelines, and the long core holder 10 is connected to the long core holder. A confining pressure pump 18 is provide...

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Abstract

The invention discloses a shale fracturing fluid forced imbibition and flowback experiment method under the condition of containing adsorbed gas. The method comprises the steps of: connecting crack development, crack underdevelopment and base block shale in series to form a shale multi-scale reservoir seepage space; putting the sample into a long rock core holder; and injecting methane gas into aclamper; after pore pressure and methane adsorption balance are controlled through a rock core outlet end back-pressure valve, achieving forced imbibition of the fracturing fluid under the action of positive pressure difference of a rock core inlet end, enabling the outlet end to monitor methane gas replaced in the imbibition process of the fracturing fluid, and in the flowback stage, simulating the flowback process of the fracturing fluid by setting the pressure difference through the rock core inlet end back-pressure valve. In the process, the core resistance is monitored in real time, and the imbibition and retention amount of the fracturing fluid in the shale multi-scale reservoir seepage space are reflected through the resistance. According to the method, the imbibition and flowback processes of the fracturing fluid in the shale multi-scale reservoir seepage space under the condition of containing the adsorbed gas can be truly simulated, and references are provided for optimizingthe soaking time and formulating a reasonable flowback system after the shale gas well is fractured.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas engineering, in particular to the technical field of shale gas development, in particular to an experimental method for forced imbibition and flowback of shale fracturing fluid under the condition of adsorbed gas. Background technique [0002] Shale gas is an important unconventional energy source, and horizontal well staged hydraulic fracturing technology is one of the important means to realize the commercial exploitation of shale gas. Compared with conventional sandstone and carbonate reservoirs, shale gas reservoirs are characterized by high content of clay minerals, rich in organic matter, well-developed lamellation and multi-scale pore structure. The shale gas production process includes the diffusion of free gas, seepage and desorption, diffusion and seepage of adsorbed gas. The retention of fracturing fluid has a significant impact on gas production. Therefore, simulati...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N27/04
CPCG01N15/08G01N15/0826G01N27/048G01N2015/0866
Inventor 陈明君白佳佳康毅力游利军陆钰刘江赖哲涵李佩松杨东升李可明
Owner SOUTHWEST PETROLEUM UNIV
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