Method for determination of dispersion degree for water and gas mixture

FIELD: oil and gas industry.

SUBSTANCE: method includes receipt of water and gas mixture under high pressure, sampling of water and gas mixture and its transfer to a metering tank at the same pressure. Before measurement volume of the metering tank is measured and in measurement process change in free gas pressure, volume of free gas and the respective increment in free gas volume is recorded permanently, total volume of gas is determined for the taken sample; then dependency of free gas volume in the tank ΔP id determined and re-calculated to dependency of pressure change (ΔP) on relative share of the current free gas mass mig/mg, where mg is the total quantity of gas mg in the taken sample, mig is a current value of the free gas mass; then radius is determined for gas bubbles contained in the share of the current free gas mass according to the following formula: r i = 2 σ Δ P i where σ is interfacial tension and function of bubbles radius distribution determined.

EFFECT: provision of disperse degree measurement for water and gas mixture both in transparent and non-transparent dispersion medium.

4 cl, 1 ex, 1 tbl

 

The invention relates to the oil industry and can be used to determine the parameters of fine-gas mixture (MDGS) before injection.

It is established that the extraction of residual oil from flooding the reservoir provides mixing the displacement of hydrocarbon gases that is ultra-low interfacial tension at the contact phases. Such conditions occur when the displacement of oil by agents that virtually eliminate the negative effects of capillary forces on the displacement of oil. Process, use of associated petroleum gas (APG) for injection into oil-bearing stratum, solves a number of industrially and environmentally important issues. One of the promising applications of APG - reverse injection under high pressure for enhanced oil recovery and enhanced oil recovery. The reverse injection of the extracted gas is used as a secondary method of oil production and, despite the additional costs associated with the need for its purification, compression, at the same time, prolongs the life of the oil fields, providing additional volumes of oil production. Thus, the gas can be reused throughout the entire period of active exploitation of oil deposits. Known methods for the development of flooded oil fields at a later stage, including the injection of working agent through the injection wells in non-stationary mode, it periodically through injection wells inject water-gas mixture consisting of produced water and dispersed therein purified gas from the bubble sizes up to 5 microns (U.S. Pat of the Russian Federation No. 2236573). Also known the way of the development of oil deposits at a later stage, including the establishment of the nature of the distribution of the current saturated thickness or the current oil saturation of the reservoir, periodic operation of high water-cut wells located in areas of low values of net oil pay thickness or saturation, the operation of the wells are located in areas of elevated values of net oil pay thickness or oil saturation factor, forced modes selection of fluid injection through injection wells water-dispersed mixture (VGDS), consisting of produced water and dispersed therein purified gas, characterized in that the injection VGDS implement, periodically changing the degree of dispersion: first injection VGDS with the size of the gas bubbles, commensurate with the size of the pore channels, washed with water, up until the cut crude production will decrease by 2-6,1%, then the injection of VGDS with the size of the gas bubbles, commensurate with the size of the capillary and subscapular oily pore channels, up until production watercut after this reduction will increase by 0.5 to 2.5%, while maintaining the specified periodic variation of the degree of dispersion of VGDS during the whole period of its injection (U.S. Pat. Of the Russian Federation No. 2318997).

Mixing oil with gas formation water is provided by injection of produced water oil gas: a gas under high pressure, podsushivaet water, raspalas in her small bubbles. For more dispersion of gas used different dispersers. However, the configuration of each disperser to obtain MDGS requires calibration, i.e. the study of the distribution of the sizes of the bubbles on the configuration of the modes of operation of the ejector and dispersant in the field.

However, there is currently no reliable way of measuring the size of gas bubbles in liquids with high gas content and the presence in the analyzed mixture of foreign matter (dust, mill scale, droplets of water-immiscible liquid and the like)

Known methods for determining the dispersion of the water-gas mixtures (acoustic and optical) is suitable for measurements in carefully cleaned from impurities liquids in a fairly narrow ranges gas saturation (Acoustic journal, 1961, Vol.7, No. 4, str-427; all-Union Symposium. physics of acoustic-hydrodynamic phenomena optoacoustic. The abstracts. M.: Nauka, 1979, p.42-43; Mikhalev A.S., Rinkevicius BS, Grigory Skornyakov NM Laser interferometric method of determining parameters of gas bubbles, Metrology, 2009, No. 9, p.3-14; RF Patent №2037806).

A common disadvantage of the above methods of measuring and controlling the dispersion of the water-gas mixtures is the inability to effectively use them in the field.

In connection with the above, the main technical challenge which seeks the invention is to provide a method for determining the size of the gas bubbles in a liquid when significant gas saturation, which is insensitive to the presence in the system outside of the dispersed phase (dirt), and a simple device for its realization in the conditions of the field.

Closest to the present invention is a method of determining the degree of dispersion of the gas mixture (foam) under pressure, including the production of water-gas mixture under high pressure and translated it into a measuring container at the same pressure. (Vasiliev VK, Bykova T.N., Markin, A.A. Stability of foams under pressure. Petroleum engineering, No. 5, 1976, p.27-29).

The disadvantage of this method is the necessity of making measurements using microscopic photography that requires a microscope with recording equipment that turn iskluchau the possibility of carrying out measurements in the case of opacity of variance (continuous) phase, or when the presence of the impurities, as well as the inability for rapid measurements in field conditions

The aim of the invention is the provision of measuring the dispersion of the gas mixture for transparent and conditions with an opaque (or contaminated) of the dispersion medium.

The proposed method is as follows. The method is based on the experimental fact, namely, that when the separation of polydisperse gas mixture primarily destroyed most of the large bubbles. Since the excess gas pressure in the bubble Δ in equilibrium with the liquid, is related to the size of the bubble r and surface tension coefficient σ formula of Laplace:

ΔP=2σr(1)

when the destruction of the bubbles with the size of rithe pressure in a sealed vessel with a water-gas mixture will increase in value:

ΔPi=2σri(1a)

as the separation gas mixture pressure in the gas layer is formed over the layer flowing down to the bottom of the pressurized vessel and a layer of water-gas mixture will increase. Detecting a pressure change in the vessel and the volume of gas, it is possible to calculate the initial distribution of gas bubbles in size. The final value of the increment of the pressure ΔTo(after complete separation of the mixture of gas and liquid) characterizes srednevekovoi the radius of the bubbles in the gas mixture at the time of sampling and concluding it in a sealed vessel, and the ratio of the amount (level) of the liquid in the vessel to the volume occupied spin-off gas, water-gas ratio.

From the discharge line of fine gas mixture (MDGS) when the discharge pressure P0selected sample in a hermetically sealable container with volume V0(by definition MDGS preparing monodisperse or with a fairly narrow size distribution of the bubbles). In the lid and the container bottom mounted pressure sensors, temperature. The device is equipped with an ultrasonic probe volume in the form of a multibeam sonar or ultrasound scanner, a sensor which is placed in the lid of the container.

In the research process is logged to the change in pressure under the cover of the vessel ΔPiand the corresponding increment of the volume of the free gas ΔV i. The amount of gas contained in the volume ΔV1is calculated by the equation Mendeleev-clayperon

(P0+ΔPi)ΔVi=nIRT;(2)

ni- the number of moles of gas, R is the universal gas constant, T is the absolute temperature.

The total amount of gas mgcontained in the selected sample, is calculated by the equation Mendeleev-clayperon(P0+ΔPK)ΔVi=n0RT;(3)

keeping in mind that mg=MP0where M is the average molecular weight of the injected gas, and n0- the number of moles of gas in the sample is calculated by the formula (3).

In the process of measurements obtained dependence Δ of the volume of free gas in the vessel. This dependence is converted (used with the eating of the above ratios) in dependence on the relative proportion of the current value of the mass of free gas m/mg

ΔP=f(mig/mg)(4)

Differentiation of the latter dependence allows for the use of ratios (1A), to obtain the size distribution of gas bubbles in MDGS.

The ability of the proposed method and device proved by the use in domestic and foreign practice equipment for gas injection and gas-liquid mixtures using the pump volumetric displacement, the presence of commercially available high-precision pressure sensors and temperature, as well as precision ultrasonic scanners.

An example implementation of the method

Capacity - V0=0,100 m3gas CH4(M=16), P0=50000 PA, σ=0,n/m

P (PA)50000501005050051000515005200052100
Δ (PA) 01005001000150020002100
ri(mm)≥1,46≥0,29≥0,146≥0,097≥0,073≥0,069
ΔVi(m3)00,0010,0030,030,070,08of 0.081
T293293293293293293293
ni(mol)00,02 0,0620,6281,481,711,73
m(grams)00,320,99510,0423,6827,3227,68
Mg27,68
m/mg00,0120,03590,3630,8560,986
The fraction of bubbles with radius rimm≥1,460,29-1,46 0,146-0,290,097-0,1460,073-0,0970,069-0,073
%1,22,432,7to 49.313,01,4

1. How to determine the dispersion of the water-gas mixture under pressure, including the production of water-gas mixture under high pressure, the sample-gas mixture and transfer it into the measuring tank at the same pressure, characterized in that before measurement is determined by the volume of the measuring vessel, and in the process of measuring continuously registers the change in pressure of the free gas within the measuring vessel and the amount of free gas, the corresponding increment of the volume of free gas, will determine the total amount of gas contained in the selected sample is then determined by the dependence Δ of the volume of free gas in the tank, which is then translated in dependence of pressure change (Δ) from the relative proportion of the current value of the mass of free gas m/mgwhere mg-the total amount of gas mgcontained in the currently selected sample, miك -the current value of the mass of free gas, then determined the radius of the gas bubbles contained in a fraction of the current value of the mass of free gas according to the formula:
ri=2σΔPi,
where σ is the interfacial tension,
and calculate the distribution function of the bubble radius.

2. The method according to claim 1, characterized in that the quantity of gas contained in the volume is calculated by the equation Mendeleev-clayperon:
(P0+ΔPi)ΔVi=niRT;(1)
where ni- the number of moles of gas,
R is the universal gas constant,
T is the absolute temperature,
P0-the initial gas pressure in the measuring vessel,
Δi- increase pressure,
ΔVithe increase in gas volume.

3. The method according to claim 1, characterized in that the total amount of gas mgcontained in the selected sample, is calculated by the equation
mg=Mn0,
where M is the average molecular weight is acaciaelongi gas, and n0- the number of moles of gas in the sample.

4. The method according to claim 1, characterized in that the number of moles of gas in the sample, is calculated by the formula:
n0=RT/(P0+ΔPK)ΔVi,
where ΔTo- the final increment of pressure;
ΣΔVi- the total volume of gas evolved.



 

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