Method for measuring water concentration in oil product

FIELD: oil and gas industry.

SUBSTANCE: method involves three main stages: sampling of fixed volume of oil product sample the temperature of which is measured; then, fixed chemical reagent volume is added to sample (sulphuric acid) and sample temperature change is measured; level of product water content is determined. First, relationship between oil product water content level and fixed oil product volume temperature increment level is determined at its interaction with fixed chemical reagent volume and calibration charts are built for further determination of oil product water content. Sulphuric acid is used as chemical reagent.

EFFECT: possibility of high-accuracy determination of oil product water content due to recording the parameters determining the oil product water content level; simplifying the set of devices required for implementation of the method.

2 cl, 2 dwg

 

The invention relates to measuring the water content of liquid petroleum products and can be used to determine the percentage of water in petroleum products during their processing and/or burning and/or preparation of water-fuel emulsions (VTE).

There is a method of determining the water cut oil production, according to which in the annular space of the well can withstand the portion of the accumulated products to its separation into components (gas, oil and water) under the action of gravitational forces, then these components by the flow of well production through the flow transducer squeezed from the annulus, recording time of each component, and the components are identified, for example, the indicator density (cm. SU # 1437495, EV 47/10, 1988).

The disadvantages of this method are the low accuracy due to the impossibility of full separation of production wells without heating and the introduction of chemicals, and also the long duration of each measurement.

There is also known a method of measuring the concentration of water in the oil, including the identification of the relationship between physical parameters of the oil and its water content, a sample of oil, the measurement of its physical properties and determination of the level of the water cut of the product using the dependencies between its Phi is practical parameters and the level of water content (see RU # 2220282, EV 47/10, 2003). How is that partially separated the petroleum production contained in a vertical cylindrical vessel, can stand up to the state of complete absence of a bubble of gas and sedimentation foam, measure the height of a column of liquid, the hydrostatic pressure, on the basis of the obtained data, calculate the density of the fluid and using the values of the densities of water and oil contained in wells, determine its mass cut.

The disadvantage of this method is the low accuracy of determination of the water content caused by the use of laboratory values of the densities of water and oil contained in wells in which it is difficult to foresee the effect of dissolved gas.

The challenge which seeks the proposed solution is reflected in the increasing precision and efficiency to determine the water content.

The technical result obtained by solving the problem is to provide opportunities for high-precision determination of the water content of the oil, as fixed parameters, uniquely determines the level of the water content of the oil. This simplifies the set of devices required to implement the method.

To solve this problem the method of measuring the concentration of water is the oil including identifying dependencies between the physical parameters of the oil and its water content, a sample of oil, the measurement of its physical properties and determination of the level of the water cut of the product using the relationship between physical parameters and the level of watering, characterized in that pre-determine the relationship between the level of water cut of the petroleum product and the level of the increment of the temperature of a fixed volume of oil under the influence of the fixed volume of the reagent, the reaction with water is exogenous, while in the process of measuring the concentration of water in the oil selected a sample of oil fixed volume, measure its temperature, then in a sample of oil injected a fixed amount of sulfuric acid and measure its the final temperature, after which, according to the established dependencies, determine the concentration of water in the oil. In addition, as a reagent used sulphuric acid.

Comparative analysis of the essential features of the proposed solution with essential features unique and prototype demonstrates its compliance with the criterion of "novelty".

This distinctive features in the claims solves the following functional tasks.

Signs of "pre-detection of the individual relationship between the level of water cut of the petroleum product and the level of the increment of the temperature of a fixed volume of oil under the influence of the fixed volume of the reagent, reaction with water is exogenous..." permit to construct a calibration graph for the subsequent determination of moisture content of different fuels (fuel oil).

Signs "...in the process of measuring the concentration of water in the oil selected a sample of oil fixed volume" allow for the comparability of the measurement results and the values of the measured parameter on the calibration graph.

The signs that measure the initial temperature of the sample oil, allow for the subsequent fixing of its final temperature to determine the value of the increment of the temperature, which is the input parameter for the use of the calibration graph.

Signs pointing to the fact that "in a sample of oil injected a fixed amount of sulfuric acid to provide comparability of the measurement results and the values of the measured parameter on the calibration graph.

Signs "...according to the established dependencies determine the concentration of water in the oil..." provide quantitative characteristics of the water content of the oil.

Signs of additional claim specify the type of reagent used for implementing the method.

1 shows a diagram of a device enabling the method of Fig. - calibration graph for the determination of moisture content of fuel oils and experimental high-viscosity fuel (tar - 75% + mazut M 100 25%), where 1 - oil - 5; 2 - oil M40; 3 - oil MV; 4 - experimental high-viscosity fuel.

Device for measuring the concentration of water in the oil contains the vessel 1, for placing a sample of a petroleum product made from heat-resistant and acid-resistant material, the conductivity of which is small, for example PTFE. As a means of mixing the used oil stirrer, a working body which is made in the form of the impeller 2, is mounted at the end of the rod 3 (named parts are made of acid-resistant material). The rod 3 is arranged to bond with the shaft of the electric motor 4 (for example, through a coupling, not shown). The motor 4 is bonded with the end of the bracket 5, is rigidly secured to the sleeve 6, is placed on the vertical guide 7, is fixed on the base 8, with the possibility of reciprocating motion along it. The vessel 1 is placed on the base 8, is rigidly mounted on a vertical guide 7. In addition, the sleeve 6 is provided with a locking screw 9, made with the possibility of detachable fastening of the sleeve 6 with a vertical guide 7. As a means of measuring the physical parameter of the sample nafter the product used thermometer 10. The motor housing 4 is provided with an additional bracket 11 is made with the possibility of fixing it thermometer 10.

The method is as follows.

Before analysis the insulated vessel 1 is filled with a fixed amount of VTE, such as 25 ml, and measure its temperature with a thermometer 10. After switching on the stirrer 2 pour a fixed amount of concentrated sulfuric acid, for example, 20 ml, and after stirring the mixture measured by thermometer 10 of its final temperature. On the final and initial values of temperature VTE determine their difference Δt and calibration schedule is the moisture content. Calibration graph receive preliminary measurement device difference Δt for a few pre-prepared fixed samples hte same amount of known moisture content. Exemplary sample VTE receive a dosage of oil and water volume method and thorough mixing of both components in high-speed mechanical stirrer 2.

Moisture measurement of high-viscosity fuel has some peculiarity. High viscosity fuel consists of 75% (by weight) of tar and 25% mazut M-100. At a temperature of 20...25°C, at which starts the measurement of the moisture content of VTE, the viscosity of the fuel is so high that the mixer does not produce enough good mixing. In connection with e is for them to reduce the viscosity of the fuel type kerosene. Experimentally selected additive in a sample of 20% kerosene. Calibration of the instrument produce similar calibration on VTE-based fuel oils.

On the calibration graph (figure 2), obtained by measuring the moisture content of VTE shows experimental data for different fuels (f 5, M 40, M 100V and experimental high-viscosity fuel). From this it follows that for VTE on the basis of fuel oil to the value of the moisture content of 25...30% of the temperature difference does not depend on the type of fuel, which is a big advantage of this measurement method.

1. The method of measuring the concentration of water in the oil, including the identification of the relationship between physical parameters of the oil and its water content, a sample of oil, the measurement of its physical properties and determination of the level of the water cut of the product using the relationship between physical parameters and the level of watering, wherein the pre-identify the relationship between the level of water cut of the petroleum product and the level of the increment of temperature of a fixed volume of oil under the influence of the fixed volume of the reagent, the reaction with water is exogenous, while in the process of measuring the concentration of water in the oil selected a sample of oil fixed volume, measure its temperature, then in a sample of oil is oduct enter a fixed amount of sulfuric acid and measured its final temperature, after that, installed the dependencies determine the concentration of water in oil.

2. The method according to claim 1, characterized in that the reagent used sulfuric acid.



 

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