Method for quantitatively evaluating influence of water injection on distribution of pore throats
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A quantitative evaluation, pore throat technology, applied in suspension and porous material analysis, measurement device, permeability/surface area analysis, etc. Error, Overcoming the Effect of Qualitative Analysis
Active Publication Date: 2014-07-16
XI'AN PETROLEUM UNIVERSITY
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In the published articles, the characteristics of pore throat changes are mainly evaluated by comparing the mercury injection data before and after water flooding and the comparison under a thin-section microscope. The main disadvantage is that the parame
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Embodiment 1
[0027] The method for quantitatively evaluating the influence of water injection on pore-throat distribution in the present invention, see figure 1 shown, including the following steps:
[0028] Step 1. Drill a core with a diameter of 2.5 cm and a length of 5.5 cm from the full-diameter core, wash oil and dry it. The gas porosity is 14.20%, and the gas core permeability is 2.29×10 -3 μm 2 , the calculated pore volume is 3.55 cm 3 ;
[0029] Step 2, prepare simulated formation water for experiment, the salinity of formation water reaches 48000mg / L;
[0030] Step 3, preparing experimental simulated oil according to kerosene and formation crude oil, the viscosity is 2.08mPa.s;
[0031] Step 4. Put the rock core in the high pressure bag and device, the pressure is 5MPa, the time is 6 hours, make it saturated with simulated formation water, and measure the nuclear magnetic resonance T 2 Spectrum;
[0032] Step 5. Place the core saturated with simulated formation water in the ...
Embodiment 2
[0037] A method for quantitatively evaluating the effect of water injection on pore-throat distribution includes the following steps:
[0038] Step 1. Drill a core with a diameter of 2.5 cm and a length of 5.2 cm from the full-diameter core, wash oil and dry it. The gas test core porosity is 11.02%, and the gas test permeability is 0.28×10 -3 μm 2 , the calculated pore volume is 2.81cm 3 ;
[0039] Step 2, prepare simulated formation water for experiment, the salinity of formation water reaches 48000mg / L;
[0040] Step 3, preparing experimental simulated oil according to kerosene and formation crude oil, the viscosity is 2.08mPa.s;
[0041] Step 4. Put the rock core in the high pressure bag and device, the pressure is 5MPa, the time is 6 hours, make it saturated with simulated formation water, and measure the nuclear magnetic resonance T 2 Spectrum;
[0042] Step 5. Place the core saturated with simulated formation water in the core holder, and use the configured simulate...
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Abstract
The invention discloses a method for quantitatively evaluating influence of water injection on distribution of pore throats. The method comprises the following steps: taking rock core for experiment, scrubbing oil and drying, measuring porosity and gasometry permeability of the rock core and calculating pore volume; preparing formation water salinity of simulated formation water for experiment; preparing oil field crude oil viscosity of experiment simulated oil; saturating the rock core and simulating the formation water, and measuring a nuclear magnetic resonance T2 spectrum; displacing the rock core of the saturated and simulated formation water by using prepared and simulated oil and recording original oiliness saturation and recording initial oil saturation; selecting a simulated formation water displacing speed according to the rock core permeability, simulating formation temperature and pressure, displacing the rock core of the saturated oil by using the simulated formation water and enabling the rock core to achieve residual oil saturation; scrubbing oil and drying the rock core, then saturating the simulated formation water and measuring a nuclear magnetic resonance T '2 spectrum; respectively drawing a distribution curve graph of the nuclear magnetic resonance spectrums before and after driving water, quantifying to obtain the degrees of influence of different water drives on the distribution of the pore throats. The method is capable of testing online, thereby realizing the quantitative evaluation on the degree of influence of water injection on the distribution of the pore throats.
Description
technical field [0001] The invention relates to the technical field of oil and gas development and testing, in particular to a method for quantitatively evaluating the influence of water injection on pore throat distribution. Background technique [0002] In the process of oilfield water injection development, it will affect the distribution of pore throats in rocks, which will change the law of oil-water movement and make the distribution of remaining oil more complex. It is of great reference value to guide the remaining oil to tap the potential of remaining oil by clarifying the impact of water injection on the distribution of pore throats. In existing research, patent CN102953726A discloses a method and device for identifying dominant channels in water drive oilfields; A method for water-washing degree of sandstone reservoirs in oil reservoirs; patent CN102312666A discloses a method for improving water flooding oil recovery in low-permeability reservoirs; patent CN102146...
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