Formation fluid treatment method

FIELD: oil production, oil refining, oil chemistry and other fields connected with emulsion breakdown, particularly adapted for formation fluid separation into such components as oil, gas and water.

SUBSTANCE: method involves subjecting formation fluid flow to magnetic treatment to provide emulsified water droplet coalescence; breaking inhibiting shells at oil-water interface to provide additional water droplet collision. To increase rate of water-gas-oil emulsion stratification, to improve quality of emulsion separation into oil, gas and water and to reduce emulsifier consumption above magnetic treatment is carried out in field directed transversely to fluid flow and having strength H = 5-10kA/m and magnetic field strength gradient dH/dr=2-5·106 A/m2. Unidirectional unipolar point constant magnets are used for above magnetic field creation. Inhibiting shells are broken with the use of vibration having 10-100 Hz frequency and 0.5-10 mm amplitude.

EFFECT: increased emulsion breakdown rate along with decreased hydrocarbon concentration in water and water content in hydrocarbon, as well as reduced demulsifier consumption.

1 tbl, 2 dwg

 

The invention relates to the field of oil production, refining, petrochemical and other fields related to the destruction of emulsions, and can be used in technological methods for the separation of fluids into components - oil, gas, water.

As is well known, the presence of mechanical impurities increases the separation of water-hydrocarbon mixtures and the content of hydrocarbons in the water, and the aqueous phase in the hydrocarbon, i.e. mechanical impurities act as stabilizers [pozdnyshev GN. Stabilization and breaking emulsions. - M.: Nedra, 1982. - 222 S.]. Thus, in the preparation of the production wells, the main task is to remove them from the stream, which facilitates the separation of fluids on the components of oil, gas, water.

A method of processing production wells, including its heating and subsequent destruction of booking membranes at the interface oil-water hydrodynamic method in highly developed turbulent regime. Site destruction booking shells made in the form of a Laval nozzle, where the diameter of the narrow part is determined by the hydrodynamic calculation to create sellersville turbulent flow regime. [RF patent №2045982, CL 01 D 17/00, 01 D 19/00, 1995].

The disadvantage of this method is the low efficiency of preparation of production wells.

Most Blimber is Kim to the declared object is a method of processing production wells, including heating and subsequent treatment in a magnetic field for coalescence of emulsified water droplets and the destruction of the book of shells on the phase boundary "oil-water" for further merging of drops of water. To create the magnetic field is the installation of magnetic treatment, in which the magnets are installed in the form of a ring. Site destruction booking shells made with narrowing and widening parts in the shape of a cone with turbulization flow in the form of a cylinder. [RF patent №2149260, CL E 21 In 43/34, 2000].

The disadvantage of this treatment, the production wells is as follows. At the location of the magnets in the form of a ring portion of the magnetic flux is closed to the interior of the device through which the liquid flows, resulting in the space between the housing of the magnetic device and the wall of the pipeline to transport production wells creates a magnetic field of low intensity (1-2 kA/m) and gradient (dH/dr=1-5·103A/m2). Accordingly, the force acting on the mechanical impurities in the liquid will also be small.

The invention is directed to accelerate the separation of emulsions in the formation fluids with a simultaneous decrease in the concentration of hydrocarbons in water and water in hydrocarbons, as well as reducing consumption of demulsifier.

This is achieved by the fact that in the manual processing of reservoir fluids, including the magnetic flow of formation fluids to the coalescence of emulsified water droplets with subsequent destruction booking shells on the phase boundary "oil-water" for further merging of drops of water, the magnetic treatment is carried out in the direction perpendicular to the flow of fluid pulsating non-uniform magnetic field of strength H=5-20 kA/m and a gradient magnetic field dH/dr=2-5·106A/m2by exposing unipolar aimed permanent spot magnets, and the destruction of the book of shells carried by vibrations with the frequency of vibration of 10-100 Hz and amplitude of 0.5-10 mm

Figure 1 shows the proposed installation for processing of reservoir fluids; figure 2 - block of magnetic treatment installation.

The installation includes the United flanges blocks of magnetic and vibratory processing.

The magnetic treatment unit is a casing 1 within which is parallel to the incoming fluid flow plates 2 are mounted with their surfaces permanent spot magnets 3. It is advisable before the plates to install rails 4 flow streamlined shape. The magnets can be performed, for example, cylindrical or in the form of a parallelepiped.

Unit vibration treatment contains dia is agnity the housing 5, on the outer side of which is an electromagnet 6. Inside the housing 5 is fixed to the elastic plate, the vibrator 7.

The method of processing of reservoir fluids is as follows.

Commercial emulsion enters the magnetic treatment unit where under unipolar aimed permanent spot magnets creates a pulsating inhomogeneous magnetic field of 5-20 kA/m and a gradient magnetic field dH/dr=2-5·106A/m2and initiated the process of demulsification, with guides 4 directs the flow of fluid in the space between the plates 2. When the magnetic treatment attenuated connection booking membranes due to the orientation of the molecules of asphaltenes in a magnetic field, exit the shell of ferromagnetic impurities and processing of positive and negative ions in opposite directions. Further separation of the emulsion occurs in the block of the vibration treatment under the action of plate-vibrator 7, oscillating under the influence generated by the electromagnet 6 alternating electromagnetic field with a frequency of 10-100 Hz and an amplitude of 0.5-10 mm Vibration field intensifies the process of mass transfer and merging of droplets of oil.

According to the above-described technology was carried out processing of reservoir fluids NGDU "Ufanet" water content 70% in pulsating ambiguity of orodno magnetic field of 6000 A/m and a gradient magnetic field strength 4· 106And subsequent vibration exposure (example 1). Similar processing was subjected to formation fluids other parameters (example 2). The original data and the results of the examples are summarized in table.

The time of the separation and the quality of reservoir fluids depending on their processing
If actionThe magnetic field strength, a/mThe gradient magnetic field, a/m2Frequency, HzThe oscillation amplitude, mmThe concentration of demulsifier HFA-005 oil, mg/DM3The time separation of the emulsion, minThe residual concentration of oil in water, mg/l
160004·1065053025250
280005·1064782022200

For comparison, the reservoir fluid was processed according to the prototype using a laboratory model. Fish emulsion is first processed by the magnets in the form of a ring tension 1 kA/m and a gradient magnetic field dH/dr=4·103A/m 2and then processed using a Laval nozzle. The time separation of the emulsion was 55 minutes, the residual concentration of oil products in water - 850 mg/L.

As can be seen, the use of the invention will allow for a comparison with the prototype to accelerate the separation of the water-gas emulsions by creating a pulsating inhomogeneous magnetic field and simultaneously improve the separation of fluids for oil, water and gas due to the intensification of mass transfer and merging of droplets of oil (to reduce the concentration of oil in water and water in oil). In addition, it will reduce the consumption of emulsifier.

The method of processing of reservoir fluids, including magnetic flow of formation fluids to the coalescence of emulsified water droplets with subsequent destruction booking shells on the phase boundary "oil-water" for further merging of drops of water, characterized in that the magnetic treatment is carried out in the direction perpendicular to the flow of fluid pulsating non-uniform magnetic field of strength H=5-20 kA/m and a gradient magnetic field dH/dr=2-5·106A/m2by exposing unipolar aimed permanent spot magnets, and the destruction of the book of shells carried by vibrations with the frequency of vibration of 10-100 Hz and applicationready 0.5 to 10 mm



 

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