Method for obtaining maximum seepage resistance gradient of oil-water two-phase flow in tight low-permeability reservoirs
A seepage resistance and acquisition method technology is applied in the field of obtaining the maximum seepage resistance gradient of oil-water two-phase flow in tight low-permeability reservoirs, and can solve the problems affecting the effective development of low-permeability oil reservoirs, such as failure of injection and production, etc.
Active Publication Date: 2020-10-13
CHINA PETROLEUM & CHEM CORP +1
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[0002] Tight low-permeability reservoirs have finer and smaller pore throats than ordinary low-permeability reservoirs, and the seepage resistance of the fluid has a greater influence during the seepage process. The phenomena of "can't be injected and produced" have seriously affected the effective development of low-permeability reservoirs. At present, there is no effective method to obtain the maximum seepage resistance of low-permeability reservoirs.
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[0021] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0022] like figure 1 as shown, figure 1 It is a flow chart of the method for obtaining the maximum seepage resistance gradient of oil-water two-phase flow in tight low-permeability reservoirs of the present invention.
[0023] In step 101, the core is dried and saturated with deionized water, and under a certain fixed oil-water volume ratio, different displacement pressures are used to inject until a steady flow is achieved, and the multi-functional core displacement device is used to measure Steady-state pressure gradient-flow relationship, respectively record the seepage velocity of oil and water passing through low-permeability cores under different displacement pressure differences, draw the relationship curve between oil and water displacement pr...
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The invention provides a method for acquiring a maximum seepage flow resistance gradient of an oil-water two-phase flow of a compact low-permeability oil reservoir. The method comprises the steps of: step 1, measuring a steady-state pressure gradient-flow relationship, and drawing curves of a relationship between an oil displacement pressure gradient and a relationship between a water displacement pressure gradient and the flow separately; step 2, fitting the experimental curves to obtain respective non-linear seepage flow parameters of oil and water phases; step 3, calculating a water saturation numerical value corresponding to the maximum seepage flow resistance gradient by utilizing the obtained non-linear seepage flow parameters of the oil and water phases; step 4, and calculating a seepage flow resistance gradient of a core by using the water saturation numerical value corresponding to the maximum seepage flow resistance gradient. The method for acquiring the maximum seepage flow resistance gradient of the oil-water two-phase flow of the compact low-permeability oil reservoir can quantitatively characterize the maximum seepage flow resistance in water-flooding exploitation of the low-permeability oil reservoir, and lays a foundation for the rational and effective exploitation of the low-permeability oil reservoir.
Description
technical field [0001] The invention relates to the seepage characteristics of oil, natural gas and other underground fluids in low-permeability porous media and the research on the development of oil and gas reservoirs, in particular to a method for obtaining the maximum seepage resistance gradient of oil-water two-phase flow in tight and low-permeability reservoirs. Background technique [0002] Tight low-permeability reservoirs have finer and smaller pore throats than ordinary low-permeability reservoirs, and the seepage resistance of the fluid has a greater influence during the seepage process. The phenomena of "no injection and no production" have seriously affected the effective development of low-permeability reservoirs. At present, there is no effective method to obtain the maximum seepage resistance of low-permeability reservoirs. To this end, we invented a method to obtain the maximum seepage resistance gradient of oil-water two-phase flow in tight low-permeability...
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IPC IPC(8): G06Q50/02
CPCG06Q50/02
Inventor 苏海波刘显太孙业恒张世明汪勇孙红霞董亚娟张波易红霞侯玉培赵莹莹孟薇曹伟东
Owner CHINA PETROLEUM & CHEM CORP