Measurement method and measurement device for simulating emulsifying capacity of crude oil in surfactant oil displacement process

Abstract

The invention discloses a measurement method and a measurement device for simulating the emulsifying capacity of crude oil in a surfactant oil displacement process. The measurement device comprises a pump, an incubator, a pressure data collection system and a microscopic observation system, an outlet end of the pump is provided with a crude oil pipeline and a surfactant pipeline, which are connected in parallel, a holder pipeline is arranged at an outlet collection end of the crude oil pipeline and the surfactant pipeline, the holder pipeline is located in the incubator, a measuring cylinder is arranged at the outlet end of the holder pipeline, a plurality of core holding units arranged in series are arranged on the holder pipeline, the outlet end of each core holding unit is provided with a sampling chamber, a corresponding pressure sensor is arranged at an inlet end of each core holding unit, and the pressure sensor is connected with the pressure data collection system. The invention aims to provide a measurement method and a measurement device for simulating the emulsifying capacity of crude oil in a surfactant oil displacement process.

Description

Technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to a method and a device for determining the emulsification ability of crude oil along the course of a simulated surfactant flooding process. Background technique [0002] The well spacing of the oil field production is very large. When surfactant flooding is performed, the surfactant solution continuously contacts, mixes, carries, and emulsifies the underground crude oil from the injection well to the production well to form an emulsion. The formed emulsion can stay in the pores, thereby causing the flow to divert and expanding the sweep efficiency; reducing the interfacial tension between oil and water; reducing the mobility ratio, thereby increasing the recovery factor. If an emulsion with high viscosity or large particle size is formed in the deep part of the formation, the injection capacity of the displacing agent will be reduced; therefore, if the d...

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Problems solved by technology

For the research on the oil-water emulsification process, the oil-water emulsion was first prepared in proportion by the agitator, and then the water separation rate of the emulsion was recorded at a certain temperature to study the factors affecting the stability of the emulsion; The microscopic model has observed the formation process of the emulsion, and there is a big difference between the oil-water distribution state in the above experimental model and the oil-water distribution state in the porous medium; the emulsification law of the ASP solution and the residual oil was studied by using a long sand-filled thin tube. Collect the output fluid at the end, and then measure the parameters such as the water separation rate of the output fluid. This method is out of the actual environment of the porous medium. The output fluid has changed, and only the state of the effluent at the outlet end can be observed, not the state of the output fluid. Real-time observation of the emulsification situation on the spot, so the emulsification state at each position along the way cannot be determined, and the existing evaluation methods cannot prove whether emulsification and the degree of emulsification occur in various parts of the core under the condition of seepage of the surfactant in the porous medium

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