Device and method for evaluating dynamic scaling and scale inhibition of oil field

Abstract

The invention relates to the technical field of oil field evaluation test devices, and concretely relates to a device an a method for evaluating the dynamic scaling and scale inhibition of anan oil field. The oil field dynamic scaling and scale inhibition evaluation device is formed by a deoxidizing device, a liquid conveying unit, a mixing mechanism, an information detecting and recording unit, a rock core displacement dynamic evaluation system, a capillary pipeline dynamic evaluation pipeline and a constant temperature box. According to the evaluation method of the oil field dynamic scaling and scale inhibition evaluation device, under the condition that the field temperature, pressure, flow velocity and different flow state working conditions are simulated in a manner of being most close to the actual conditions of an injecting water reservoir, the scaling induction period time is quickly judged through the change of pressure difference and permeability, and a technical basis is provided for a field water injection scheme; and meanwhile, an effective scale inhibitor and an optimal use concentration are screened out for on-site scale inhibitor quality monitoring, an evaluation means is provided for novel scale inhibitor research and development and mechanism research, and the device is easy to operate, high in automatic control degree and convenient to maintain.

Description

technical field [0001] The invention relates to the technical field of oil field evaluation test devices, in particular to an oil field dynamic scaling and anti-scaling evaluation device and evaluation method. Background technique [0002] At present, domestic oilfields generally adopt water injection oil recovery technology, but because some oilfield injection water is Na2SO4 type, rich in a large amount of scale-forming anions, and formation water salinity is generally high, mainly CaCl2 water type, containing high concentrations of calcium and barium Scaling cations, injection water and formation water are seriously incompatible, and with the deepening of oilfield development, the comprehensive water cut continues to rise, resulting in serious scaling of surface pipelines, wellbores, and even formations. [0003] There are the following problems in oilfield scale evaluation and antiscalant screening: First, the method of scale influence in the oilfield production process ...

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Problems solved by technology

[0002] At present, domestic oilfields generally adopt water injection oil recovery technology, but because some oilfield injection water is Na2SO4 type, rich in a large amount of scale-forming anions, and formation water salinity is generally high, mainly CaCl2 water type, containing high concentrations of calcium and barium Scaling cations, injection water and formation water are seriously incompatible, and with the deepening of oilfield development, the comprehensive water cut continues to rise, resulting in serious scaling of surface pipelines, wellbore, and even formations

[0003] There are the following problems in oilfield scale evaluation and antiscalant screening: First, the method of scale influence in the oilfield production process is mainly based on static tests. This method does not consider the effects of pressure, fluid flow, etc., especially on-site production. Among them, the actual impact of scale deposition on the pipe wall surface is often much more serious than the macroscopic precipitation in the static solution body, and the static test cannot truly reflect the scaling situation under field conditions; In the performance evaluation, the specific test methods refer to the standard SY / T 5673-93 "Performance Evaluation Method of Scale and Scale Inhibitors for Oilfields", Q / SY 126-2014 "Technical Specifications for Corrosion and Scale Inhibitors for Oilfield Water Treatment" as the basis

Its disadvantage is that it cannot simulate the fouling situation under high temperature and high pressure conditions

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