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AC impedance spectrum evaluation method for influence of CO2-water-rock interaction on pore throat structure of dense rock

A technology of AC impedance spectroscopy and compact rock, applied in the direction of material electrochemical variables, etc., can solve unrelated problems, achieve the effect of maintaining the original characteristics, simple device, and convenient operation

Inactive Publication Date: 2020-02-18
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

None of the above methods or techniques involve CO 2 - A rapid qualitative evaluation method for the influence of water-rock interaction on the pore-throat structure of tight rocks

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  • AC impedance spectrum evaluation method for influence of CO2-water-rock interaction on pore throat structure of dense rock
  • AC impedance spectrum evaluation method for influence of CO2-water-rock interaction on pore throat structure of dense rock
  • AC impedance spectrum evaluation method for influence of CO2-water-rock interaction on pore throat structure of dense rock

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Embodiment

[0042] CO 2 - AC impedance spectroscopy evaluation method for the impact of water-rock interaction on the pore-throat structure of tight rocks, including the following steps:

[0043] Step 1. Core preparation: Drilling a core column with a diameter of 25.4mm and a length of 30mm from the full-diameter core, the drilling direction is the radial flow direction of the formation fluid, and drying after oil washing;

[0044] Step 2. Formation water configuration: According to the water sample analysis of oilfield produced water, a solution simulating formation water is prepared;

[0045] Step 3, putting the core sample into the prepared formation aqueous solution, and vacuuming and saturating for 24 hours;

[0046] Step 4. Attach the two ends of the core sample saturated in step 3 to the electrode sheet and connect the wires. Connect the wires to the electrochemical workstation. The open circuit potential of the test system is 5mv, and the disturbance voltage is set to 5mv to test...

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Abstract

The invention discloses an AC impedance spectrum evaluation method for the influence of CO2-water-rock interaction on a pore throat structure of a dense rock. The method comprises the steps of: firstly, preparing a core, and configuring formation water; then, vacuumizing the core, and saturating the formation water; measuring an initial AC impedance spectrum of the core; placing the core in a holder, and injecting CO2 and the formation water under the formation pressure and temperature; measuring the AC impedance spectrum of the core; and comparing Nyquist maps before and after the CO2-water-rock interaction, fitting an equivalent circuit diagram according to the Nyquist maps, and qualitatively evaluating the influence of the CO2-water-rock reaction on the core according to the change condition of the magnitude of the connected pore resistance in the circuit diagram. By adopting the method disclosed by the invention, the influence of the CO2-water-rock interaction on the pore throat structure of the dense rock can be quickly, accurately and qualitatively evaluated.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a CO 2 - AC Impedance Spectroscopy Evaluation Method for Effect of Water-rock Interaction on Pore Throat Structure of Tight Rocks. Background technique [0002] my country has huge reserves of unconventional oil and gas resources, and tight oil and gas reserves occupy an important position in unconventional oil and gas resources. At present, the commonly used reservoir stimulation method is slick water fracturing. This method has achieved good results in conventional reservoir stimulation, but it also exposed many problems in the development of tight oil and gas. The permeability of tight oil and gas matrix is ​​extremely low. During the process of drilling and reservoir stimulation, drilling fluid and fracturing fluid can easily damage the reservoir, resulting in a decline in production. Slippery water may cause damage such as water locking, swelling and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/26
CPCG01N27/26G01N27/30
Inventor 闫伟李文博邓金根
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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