A Method for Analyzing Oil-Water Emulsion Behavior in Near Well Zones and Perforated Blast Holes

Abstract

The present invention relates to a method for analyzing the oil-water emulsification behavior in the vicinity of the wellbore and at the perforated blasthole, which includes: 1. Obtaining the data of any oil production well or the same oil well; "Perforation is positioned on the same radial plane to determine the number of perforations; 3. Establish an equivalent circular pipe, and the radial area near the wellbore is equivalent to a number of circular pipes filled with reservoir rock particles and of the same size. Arrangement form, all the oil-water media in the reservoir that seepage through the formation pores to the wellbore are evenly distributed to flow in these circular pipes; 4. Determine the effective flow cross-sectional area of ​​the equivalent circular pipe; 5. Calculate any equivalent circle of the oil-water mixture The shear energy in the pipe flow field; 6. Repeat steps 1 to 5 to obtain the shear energy; 7. Statistically analyze the shear energy under each production condition; Dosing period and node of chemical demulsifier in the process. The invention solves the problem that the oil-water emulsification behavior is difficult to identify in the near-wellbore area and the perforated blast hole, which is an inaccessible area.

Description

technical field [0001] The invention relates to a quantitative evaluation method for the oil-water emulsification behavior of a non-surface flow shear unit of an oil well, in particular to a method for analyzing the oil-water emulsification behavior in the near-well zone and at the perforation hole. Background technique [0002] Since crude oil has the conditions to form oil-water emulsions during the production process, most of the crude oil is produced in the form of emulsions with different degrees of stability in oilfield development, and the effective identification of its emulsification behavior is the key to the subsequent realization of crude oil purification. The essential. A 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. With the application of technology, the synergistic effect of oil displacement agents w...

AI Technical Summary

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

Images