Method and device for judging the location of emulsification in a long cemented tube

Abstract

A method and device for judging the position where emulsification occurs in a long cemented pipe. The method is to use the method of connecting short cemented pipes in series, extract the continuous phase at the series connection, and observe the state of the continuous phase as a preliminary basis for judging whether the discontinuous phase in the same position in the long cemented pipe is emulsified, and then according to the core The difference in pressure between the internal emulsion and the oil / water phase mixture can determine the specific location where the oil and functional polymer solution in the long cemented pipe are emulsified. The device includes a beaker, a long cemented pipe model, a pipeline, a displacement pump, a control valve, a tee, a pressure gauge, an oil injection piston container, a functional polymer solution injection piston container, and a constant temperature box. The long cemented pipe model consists of several Short and straight metal tube molds are connected in series, and the metal tube molds are connected by flexible connecting pipelines. Sampling and pressure measurement points are arranged in the middle of the connecting pipelines. The metal tubes are filled and pressed with materials cemented with quartz sand resin.

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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