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A method for determining the yield point of w/o waxy crude oil emulsion

A determination method and emulsion technology, applied in the direction of using a stable shear force to test the strength of materials, instruments, measuring devices, etc., can solve the problem that the yield point is not easy to read accurately, and achieve the effect of enriching research progress.

Active Publication Date: 2022-06-21
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] The purpose of this invention is to provide a kind of W / O type waxy crude oil emulsion yield point determination method, this kind of W / O type waxy crude oil emulsion yield point determination method is used to solve the ductility enhancement of waxy crude oil emulsion yield process The resulting yield point is not easy to read

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  • A method for determining the yield point of w/o waxy crude oil emulsion
  • A method for determining the yield point of w/o waxy crude oil emulsion
  • A method for determining the yield point of w/o waxy crude oil emulsion

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Embodiment 1

[0038] The method for determining the yield point of W / O waxy crude oil emulsion under the experimental condition of 34℃ under the loading condition of linear increase of stress, includes the following steps:

[0039] 1. The preparation of the waxy crude oil experimental sample, that is, the pretreatment, the specific operations are as follows:

[0040] After the crude oil samples are taken from the production site and transported to the laboratory in sealed oil drums, the crude oil is fully stirred, and then packed into appropriate grinding-mouth bottles to be sealed and stored as experimental oil samples with the same composition; Put it in a water bath, let it stand and heat to 80°C, and keep it at a constant temperature for 2 hours, then take out the experimental oil sample and let it stand at room temperature, cool it naturally, and store it in a place where the ambient temperature changes little for more than 48 hours, as the base oil sample prepared by the emulsion .

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Abstract

The invention relates to a method for determining the yield point of a W / O waxy crude oil emulsion, comprising: experimentally determining the time when the gel structure of the W / O waxy crude oil emulsion is approximately completely formed; Scanning experiment, sorting out the experimental data, drawing a graph of storage modulus, loss modulus and stress, the shear stress corresponding to the intersection point of the storage modulus and loss modulus is the minimum applied stress for the yield test; Carry out shear experiments on the gelled structure in the constant shear stress loading mode and the loading mode in which the shear stress increases linearly; calculate the rate of change of the shear rate per second, that is, the rate of change of the shear rate; draw the rate of change of the shear rate The change curve with time, the obvious inflection point in the curve is the yield point of W / O type waxy crude oil emulsion. The invention can accurately obtain the yield stress and yield time of the waxy crude oil emulsion, and provide basic data for the pumpability and economic evaluation of crude oil-water pipeline mixed transportation.

Description

Technical field: [0001] The invention relates to a crude oil-water pipeline mixed transportation technology, in particular to a method for determining the yield point of a W / O waxy crude oil emulsion. Background technique: [0002] With the decreasing of onshore oil and gas resources, the global oil and gas development is developing towards the deep sea in an all-round way. In offshore oilfield gathering and transportation pipelines, the mixed transportation of oil and gas and water has become one of the main transportation methods. In the process of oil-water mixing and transportation, the oil-water two phases form an emulsion due to turbulent flow and various shearing effects. Because the crude oil contains interfacial active substances, it is easier to form a W / O type emulsion. The yield characteristics of the crude oil emulsion-gelling system are the basic data for the pumpability and economic evaluation of its pipeline transportation. [0003] There are two widely used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00G01N3/24
CPCG01N11/00G01N3/24G01N2011/0033G01N2011/002G01N2203/0092G01N2203/0025G01N2203/0298G01N2203/0676
Inventor 国丽萍刘扬成庆林刘承婷刘保君韩雪
Owner NORTHEAST GASOLINEEUM UNIV
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