A Quantitative Prediction Method of Periodic Polymer Injection Enhanced Oil Recovery
A prediction method and technology of recovery rate, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the application situation of difficult-period polymer injection mines, provide technical support, few, and the range of recovery rate is difficult Carry out quantitative prediction and other issues to achieve the effect of increasing oil recovery and increasing liquid absorption
Active Publication Date: 2021-06-22
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
However, the periodic polymer injection method involves many injection parameters, such as reservoir permeability gradient, alternating cycle, oil displacement system concentration, and injection velocity, etc., and a large number of physical simulation experiments are needed to optimize the periodic polymer injection parameters and analyze the influence of parameters. At the same time, it is difficult to quantitatively predict the extent of enhanced oil recovery by periodic polymer injection
At present, there are not many research literature reports on relevant issues, and it is difficult to provide technical support for the application of periodic polymer injection enhanced oil recovery technology in mines
Method used
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[0059] 1. Experimental conditions:
[0060] 1. The heterogeneous system is a water dispersion system of flexible microgel particles (including micron SMG (W) Granular and Submillimeter SMGs (Y) Two kinds of particles), the effective content is 100%; the polymer is partially hydrolyzed polyacrylamide (HPAM), and the relative molecular mass is 1900×10 4 , with a solid content of 90%; the oil used in the experiment was a mixture of degassed crude oil and kerosene from the J Oilfield, with a viscosity of 17 mPa s at 57 °C; the experimental water was simulated water prepared according to the salinity of the J Oilfield.
[0061] Table 1 Water quality analysis results
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[0064] 2. The experimental core is a quartz sand epoxy resin cemented artificial homogeneous core. The experimental model is composed of two cores connected in parallel. The appearance geometric dimensions are length × width × height = 30cm × 4.5cm × 4.5cm. g =200, 400, 600, 800, 1000, 1200×...
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The invention discloses a method for quantitatively predicting the amplitude of recovery rate enhancement by periodic polymer injection. It includes the following steps: 1) optimization of periodic polymer injection parameters; 2) analysis of influencing factors: according to the optimal periodic polymer injection parameters in step 1), a Monte Carlo prediction model is established; the optimal periodic polymer injection is obtained through analysis 3) Quantitative prediction of the enhanced oil recovery range: the periodic polymer injection parameters are selected according to the distribution law, and the optimal periodic polymer injection parameters obtained in step 1) are calculated using the Monte Carlo model Random combination prediction is carried out; according to the prediction results, the relationship between the range of enhanced oil recovery and the number of tests and the cumulative number of tests can be drawn, and the range of enhanced oil recovery by periodic polymer injection under different occurrence probabilities can be obtained. The invention can increase oil recovery by periodic polymer injection in the displacement process; can optimize periodic polymer injection injection parameters; and can quantitatively predict the range of enhanced recovery, and obtain the range of enhanced recovery under different occurrence probabilities.
Description
technical field [0001] The invention relates to a method for quantitatively predicting the amplitude of oil recovery enhanced by periodic polymer injection, and belongs to the technical field of oil reservoir development. Background technique [0002] Reservoir heterogeneity is the basic characteristic of oil reservoirs. After water flooding, regardless of interlayer, intralayer, or microcosm, there will be a large amount of remaining oil that is difficult to be efficiently produced by conventional water flooding techniques. Therefore, the periodic polymer injection method for macro-heterogeneity can cause pressure disturbance between high and low permeability layers. This alternating change of pressure can improve the development effect of poor oil layers, which is beneficial to reduce water cut and increase crude oil production; A heterogeneous system (flexible microgel particles) is used for microscopic heterogeneity. The particles have good hydration expansion characteri...
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IPC IPC(8): E21B43/22E21B49/00
Inventor 孙哲康晓东王玉唐晓旭姜维东李强王秀军
Owner CHINA NAT OFFSHORE OIL CORP