Method and device for determining the critical pore radius of the influence of capillary force on pvt
A technology of pore radius and determination method, applied in measurement devices, surface/boundary effects, suspension and porous material analysis, etc., can solve problems such as low permeability, large difference in production prediction results, complex structure, etc., to improve numerical simulation The effect of precision
Active Publication Date: 2021-07-02
PETROCHINA CO LTD
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Problems solved by technology
Ultra-low permeability oil and gas reservoirs have micro-nanoscale pore throats, complex structures, and extremely low permeability. The PVT (pressure, volume, temperature) phase changes of oil and gas in them are different from conventional oil and gas reservoirs, and are greatly affected by capillary pressure and surface tension. , conventional multi-component simulations often ignore this effect, resulting in a large difference between the yield prediction results and the actual
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035] In an embodiment of the present invention, a method for determining the critical pore radius of the influence of capillary force on PVT is provided, such as figure 1 As shown, the method includes:
[0036] Step 101: Obtain the attribute parameters of multi-component oil and gas;
[0037] Step 102: According to the attribute parameters, determine the first PVT bubble point pressure curve without considering the capillary pressure;
[0038...
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The present invention provides a method and device for determining the critical pore radius of the influence of capillary force on PVT, comprising: obtaining attribute parameters of multi-component oil and gas; determining the first and third PVT bubble point pressure curves without considering capillary pressure according to the attribute parameters; According to the attribute parameters, determine the second curve considering the capillary pressure, the same wetting angle, and different pore radii, and the fourth PVT bubble point pressure curve with the same pore radius and different wetting angles; analyze different pore radii according to the first and second curves The first influence result of the lower capillary pressure on the PVT bubble point pressure curve; the second influence result of the capillary pressure on the curve under different wetting angles according to the third and fourth curves; according to the attribute parameters, the first influence result and the second influence As a result, changing the wetting angle and pore radius, the critical pore radius considering the effect of capillary pressure on the PVT phase transition was determined. This scheme improves the numerical simulation accuracy of nanoporous multi-component fluid phase transition in ultra-low permeability oil and gas reservoirs.
Description
technical field [0001] The invention relates to the technical field of numerical simulation of micro-nano pores of ultra-low permeability oil and gas reservoirs, in particular to a method and device for determining the critical pore radius of the influence of capillary force on PVT. Background technique [0002] The proportion of ultra-low permeability oil and gas reservoir resources in the remaining recoverable resources of low permeability is increasing day by day. Ultra-low permeability oil and gas reservoirs have micro-nanoscale pore throats, complex structures, and extremely low permeability. The PVT (pressure, volume, temperature) phase changes of oil and gas in them are different from conventional oil and gas reservoirs, and are greatly affected by capillary pressure and surface tension. , the conventional multi-component simulation often ignores this effect, resulting in a large difference between the yield prediction results and the actual results. Contents of the...
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IPC IPC(8): G01N13/00G01N15/08
CPCG01N13/00G01N15/088
Inventor 李宁李莉吴淑红
Owner PETROCHINA CO LTD