Low-permeability oilfield energy-gathering equi-fluidity oil displacement method
An oil displacement method and equal fluidity technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as difficult to achieve parallel oil displacement, and achieve the effect of increasing efficiency, improving efficiency, and increasing production
Inactive Publication Date: 2016-02-10
DALIAN HUAO SHENGFENG OILFIELD TECH SERVICECO LTD
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Problems solved by technology
For low-permeability reservoirs, it is difficult to achieve parallel flooding with polymers of the same molecular weight
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Embodiment 1
[0025] Example 1: Artificial 3-layer cuboid heterogeneous core, size 4.5×4.5×30cm, low, medium and high permeability respectively 20, 50, 100×10 -3 um 2 . Select 3 kinds of polyacrylamine chemical agents, the molecular weights are respectively 200×10 4 , 500×10 4 , 1000×10 4 , The measured molecular gyration radius is 32, 70, 110nm in turn. Prepare the chemical agent solution with clear water, and see Table 3 for the concentration and viscosity of the chemical agent.
[0026] Table 3 Chemical agent matching table
[0027]
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The invention discloses a low-permeability oilfield energy-gathering equi-fluidity oil displacement method and relates to the technical field of reservoir engineering. The method comprises the following steps: step I, counting and classifying permeabilities: classifying and counting the longitudinal permeabilities of an oil reservoir according to 10-50, 50-100, and greater than 100*10<-3> um<2>, and calculating the averaged permeability of each oil reservoir and the corresponding effective thickness; step II, selecting the molecular weight of polyacrylamide: according to the rule that k1, k2 and k3 are matched with the polyacrylamide P1, P2 and P3 with proper molecular weight respectively, wherein the molecular turning radius of polyacrylamide is smaller than 1 / 10 of the mid-value of a channel and can be measured by a BI-200 SM type wide angle dynamic / static light scatterometer system produced by BIC.
Description
technical field [0001] The invention relates to the technical field of oil reservoir engineering, in particular to an energy-gathering equal mobility oil displacement method in a low-permeability oilfield. Background technique [0002] The average porosity of reservoirs in low-permeability oilfields is small, and water injection development is the main way to supplement formation energy recovery. Due to the influence of reservoir heterogeneity, injected water rushes along high-permeability layers, and long-term water injection tends to form dominant water flow channels, resulting in low-efficiency and ineffective circulation of water flooding area, leading to a decrease in swept volume and lower recovery. Parallel flooding technology[1] uses polyacrylamide with the same molecular weight, and realizes parallel oil flooding by designing combined slugs with different concentrations. This oil flooding method is more effective than conventional polymer flooding methods. The yield...
Claims
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Inventor 韩艳龙陈征窦广瑞张艳李永祥李静高娜高燕
Owner DALIAN HUAO SHENGFENG OILFIELD TECH SERVICECO LTD
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