Method and device for judging emulsification generating position in long cementing tube

Abstract

Provided are a method and device for judging emulsification generating position in a long cementing tube. According to the method, a short cementing tube series connection method is used, continuous phases are extracted at series connection areas, the state of the continuous phases is observed to serve as the primary basis for judging whether emulsification is generated at non-continuous phases atthe same position in the long cementing tube, and then the specific position where oil and a functional polymer solution generate emulsification in the long cementing tube is judged according to thepressure difference of emulsion in a rock core and an oil / water phase mixture. The device comprises a beaker, a long cementing tube model, pipelines, a displacement pump, a control valve, a tee joint,a pressure meter, an oil injection piston container, a functional polymer solution injection piston container and an incubator. The long cementing tube model is formed by a plurality of metal tube molds in a series connection mode, and all the metal tube molds are in communication through the bendable connecting pipelines. Sampling and pressure measuring points are distributed in the middles of the connecting pipelines, and the metal tube molds are filled with quartz sand resin cemented materials for pressing.

Description

Technical field: [0001] The disclosure relates to a method and a device for judging the location where emulsification occurs in the technical field of oil and gas field development and enhanced recovery. Background technique: [0002] At present, most oil fields in my country have entered the high water cut period, and functional polymer flooding has become one of the effective technologies for enhancing oil recovery in the late stage of high water cut. The oil displacement mechanism of functional polymers is emulsification and viscosification. During the core displacement process, the shearing action of the reservoir core throat is used to generate emulsion. In the actual reservoir pores, due to the influence of the connectivity of small pores and the size of pore throats, the oil and water phases are dispersed and discontinuous, and more contact points or narrow contact surfaces are in contact; while the oil and water phases in conventional static tests They are distribut...

AI Technical Summary

Problems solved by technology

At present, the visible lithography glass model is mainly used to study the formation and distribution of emulsion in the core in the laboratory. Under the condition that the artificial core is invisible, the existing experimental methods have the following defects: 1. It is impossible to judge the emulsion in the core. The specific location where the oil emulsifies with the functional polymer solution

2. Under certain reservoir conditions, the actual emulsification distance is too large, which cannot be achieved with existing laboratory conditions

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