Method for analyzing oil-water emulsification behavior in near wellbore area and perforation blasthole

Abstract

The invention relates to a method for analyzing oil-water emulsification behavior in a near wellbore area and a perforation blasthole. The method comprises the steps that 1, the data of any one liquid production capacity oil well or the same oil well are obtained; 2, conventional 'screw type' perforations of actual layer sections are subjected to planar location treatment in the same radial direction, and the number of the perforations is determined; 3, n equivalent round pipes are built, a radial zone of the near wellbore area is arranged into an arrangement form in an equivalent mode, the arrangement form is composed of the multiple round pipes filled with reservoir rock particles and with the same size, and all oil-water media penetrating and flowing into an oil pool of a borehole through formation pores are uniformly distributed into the round pipes to flow; 4, the effective flow cross area of the equivalent round pipes is determined; 5, the shear energy of oil-water mixtures in any one equivalent round pipe flow field is calculated; 6, the shear energy is obtained by repeating the steps from one to five; 7, the quantitative shear energy under various production working conditions is subjected to statistic analysis; and 8, the adding period and a joint of a chemical demulsifier in the production process are formulated according to high and low changes of the shear energy subjected to statistic analysis. According to the method for analyzing the oil-water emulsification behavior in the near wellbore area and the perforation blasthole, the problem that the oil-water emulsification behavior in the near wellbore area and the perforation blasthole which cannot be reached is difficult to identify is solved.

Description

technical field [0001] The invention relates to a quantitative evaluation method for oil-water emulsification behavior of an oil well non-surface flow shearing unit, in particular to a method for analyzing oil-water emulsification behavior in a near-well zone and a perforation blasthole. Background technique [0002] Since crude oil has the conditions to form an oil-water emulsion during the production process, most of the crude oil in oilfield development is produced in the form of emulsions with different degrees of stability, and the effective identification of its emulsification behavior is the subsequent realization of crude oil purification. The essential. The conventional oil-water emulsion is a water-in-oil (W / O) system in which water droplets are dispersed in the oil phase, or an oil-in-water (O / W) system in which oil droplets are dispersed in the water phase. The application of technology and the synergistic effect of oil-displacing agents can also lead to the for...

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Problems solved by technology

Although the shear stress and flow velocity in the shear flow field are both directional vectors, the energy generated after the shear work is a scalar without direction, which is a quantitative description of the contribution of the macro flow to the shear emulsification in the flow field It provides convenience, and naturally also provides the possibility for the quantitative evaluation of the oil-water emulsification behavior of the non-surface flow shear unit of the oil well, which is often neglected in the traditional

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