The method of determining the level of the lower boundary layer of the emulsion produced water in oil dehydrator

 

(57) Abstract:

The inventive method is that identical converters remove signals at three different depths, and the level is determined by comparison of RMS values of the frequencies obtained at different depths. 2 Il.

The invention relates to the preparation of oil and is intended for use in the process of dehydration.

The closest set of features of the claimed method is a method of determining the boundary between the two liquids with different electrical properties (electrical impedance) [1] Method is to dive two identical probes (transducers) in the test environment so that these probes were located at different depths, obtaining difference signals with probes and bearing measurement information from the local areas studied medium. If both probes are in contact with the same fluid, the differential signal will be zero, if different fluids having different electrical properties (electrical impedance), the differential signal will not be equal to zero.

Prototype method, keta, forming a boundary, constant in its entirety.

The inventive method allows to obtain a higher technical result to determine the boundary between the two types of the same oil emulsion: emulsion formation water in oil emulsion of oil in produced water, as well as between the emulsion produced water in oil and formation water. In each of the emulsions there is a vertical concentration gradient and, hence, the vertical gradient of the dielectric constant, conductivity, and electrical impedance.

Achieved results allow to determine the level of the lower boundary layer of the emulsion produced water in oil dehydrator.

Higher technical result is achieved by the fact that just as in the prototype by using identical transducers receive signals at two depths in the studied environment and compare them, but, unlike the prototype, identical transducers made in the form of isolated dielectric cylindrical electrode connected in an oscillatory circuit of the oscillator, the frequency of which is an output signal of the measuring transducer, at the same time DOUT RMS frequency received on the lower and middle, and upper and middle depths.

According to the static characteristic of the measuring transducer (Fig. 1), the frequency of the oscillator depends on the type of emulsion, the volume concentration of water in the emulsion produced water in oil and so will vary slightly when changing the volume concentration in the emulsion of oil in produced water, including 100% (produced water) that these changes in practice can be neglected.

Disclosure of the nature of the proposed method provide a brief description of physical processes in the tank dehydrator.

In the tank, dehydrator, which served a watered oil, under the action of natural forces (gravity and buoyancy) and artificial influence (electric field, chemical reagents) is the process of breaking of the emulsion and separation of its components. But full delamination does not occur, there is a concentration gradient. In oil emulsions when reaching a certain concentration of the dispersed phase happens change the type of emulsion (treatment phase). Usually in the emulsion of oil in produced water stratification process proceeds quickly, and at a shallow depth from the Neue what is a stationary ergodic random process, it is therefore necessary to compare the RMS values of the frequencies.

If the RMS value of the frequency obtained for the lower and middle depths, almost equal, and the middle and top are different, the lower bound of the emulsion produced water in the oil is between the upper and middle depths. The equality of the signals from three depths shows that this boundary is above the upper depth. Inequality of all three signals indicates that this boundary is somewhere below the average depth.

In Fig. 1 shows a graph of the dependence of the mean square value of the frequency of the measuring transducer from the volume concentration of water in the emulsions of both types (static characteristic of the transducer), and Fig. 2 shows a functional block diagram of a level switch to the lower boundary layer of the emulsion produced water in oil dehydrator.

The ability of the proposed method is confirmed by its implementation in the device level switch in the bottom boundary layer of the emulsion produced water in oil in a horizontal metal tank dehydrator with a diameter of 3 m

The middle point (hole) is located at a height of 1/3 of Jindrisska electrode, isolated by a dielectric, a length of 200-300 mm, diameter 10-15 mm, is installed through holes horizontally within the tank. Tightness is ensured by performing a housing in which is mounted a cylindrical electrode.

Cylindrical electrodes insulated by the dielectric 1-3, connected to the oscillating circuit of the corresponding oscillator 4-6, each of which is connected with unit RMS frequency block C. K. Z.) 7-9. The output of block C. K. C. 7 is connected to one of inputs of the block 10 of comparison, a second input connected to the output of block C. K. C. 8. The output of block C. K. C. 8 is connected with one input unit 11 of the comparison, a second input connected to the output of block C. K. C. 9. The units of comparison are the indication of the results of the comparison.

The metal wall of the tank serves as the electrode and forms with each cylindrical electrode insulated by a dielectric 1-3, electric capacity, which is included in the oscillatory circuit of the corresponding oscillator. Changing the dielectric constant of the medium in the interelectrode space changes the capacitance and hence the frequency of the oscillator, which is the output value of the measuring prenebrezhimo low sensitivity to volumetric water content in the emulsion of oil in water reservoir eliminates the influence of the concentration gradient in it and identify with it produced water. A significant difference in the values of the frequencies for the different types of emulsions allows you to identify the boundary of the emulsion produced water in oil and oil emulsion formation water or brine water.

Receive operation the RMS values of frequencies and comparing them in the given order are implemented on the basis of computer technology and inpatient programs. The comparison operation can be performed as subtraction and division.

The METHOD of DETERMINING the level of the LOWER BOUNDARY LAYER of the EMULSION PRODUCED WATER IN OIL DEHYDRATOR, namely, that with identical transducers located at two depths in the studied environment, remove signals, and compare them to results of the comparison determine the desired value, characterized in that identical transducers made in the form of isolated dielectric cylindrical electrode connected in an oscillatory circuit of the oscillator, the frequency of which is an output signal of the measuring transducer, at the same time additionally remove the signal from the transducer located at a third depth, and compare the RMS values of the frequencies obtained at different depths of the

 

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