RU2236581C2 - Method for determining water amount in oil and device for realization of said method - Google Patents

Abstract

FIELD: oil extractive industry.

SUBSTANCE: method includes filling of sample collector with oil sample, weighing oil sample before and after filling of sample collector and determining its mass without oil sample m₁ and with oil sample m₂, detaining oil sample until appearance of boundary between oil and water, after which water is drained, weighed and mass m_wd is determined as well as density ρ_w and temperature t_w of drained water, while oil-water emulsion remaining in sample collector is pumped through densitometer and hygrometer and volume share w_e of water in oil-water emulsion is determined as well as density ρ_e and temperature t_e of oil-water emulsion and determining of amount of water relatively to oil m_w on basis of mathematical expression. Device for realization of method has sample collector with indicator of phases separation, densitometer, input of which is connected to lower portion of sample collector through first valve, hygrometer, input of which is connected through pump and second valve to densitometer output, and output is connected to upper portion of sample collector, and liquid weighing assembly, receiving tank of which is connected to densitometer output through third valve.

EFFECT: higher precision of determining of amount of oil in water.

2 cl, 1 dwg

Description

The invention relates to the oil industry and can be used in oil production and in cases where it is necessary to determine the water content in oil.

A known method for determining the water content in oil, including filling the sampler with an oil sample, settling the oil sample until an oil-water boundary appears and determining the water content in oil by its level in the sampler, as well as a device for determining the water content in oil, including a sampler with an indicator of the phase separation in the form, for example, of two floats with permanent magnets mounted in them, which can move along a non-magnetic pipe depending on the level of oil and settling water in the sampler (Is Covic RJ Technological measurements and devices. M .: Nedra, 1970).

The disadvantage of this method and device is the low accuracy of determining the water content in oil due to the fact that when sedimenting oil in the sampler between clean (dehydrated) oil and settling water, an intermediate layer is formed containing both oil and water, which introduces a large error in the determination water content by the level of settling water.

The objective of the patented invention is to increase the accuracy of determining the water content in oil by taking into account its amount located in the transition (intermediate) layer after sedimentation of water in the sampler.

This problem is achieved by the fact that in the method for determining the water content in oil, including filling the sampler with an oil sample, settling the oil sample until an oil-water boundary appears and determining the water content in oil, before and after filling the sampler with an oil sample, it is weighed and determined its weight without the oil sample m ₁ and m ₂ sample of oil, and after settling the supernatant decanted oil sample water, it is weighed and the weight of _Sun m, density ρ and t _to fusion temperature _in water, the rest in probosbor ike water emulsion is pumped through the meter and the density meter and determine the volume fraction of water in the w _e-water emulsion, the density ρ and the temperature t _{e e-water} emulsion, a determination of water content in the oil is produced from m _{in the} expression

where ρ = ρ _{vte in} [1-2 × 10 ^-4 (t _a -t _e)] - value quoted fusion water _density ρ measured at _a temperature t, temperature-water emulsion _e t.

And also by the fact that a demulsifier is introduced into the oil sample before settling.

 And also the fact that as a demulsifier use a disolvant or proxanol.

 And also the fact that the demulsifier is administered in an amount of 1-3 g.

 And also by the fact that the oil sample is heated before settling.

 And also the fact that the heating is carried out to a temperature of 45-55 ° C.

This problem is also achieved by the fact that the device for determining the water content in oil, including a sampler with a phase separation indicator, is equipped with a densitometer, the input of which is connected through the first tap to the bottom of the sampler, a moisture meter, the input of which is connected through the pump and the second tap with the output of the densitometer, and the outlet - with the upper part of the sampler, and a fluid weighing unit, the receiving tank of which is connected through the third tap to the outlet of the density meter.

And also the fact that it is equipped with a thermostat with a thermostatic jacket located around the sampler.

And also the fact that it is equipped with a paddle mixer, installed with the possibility of mixing the liquid in the sampler.

And also the fact that it is equipped with a signal processing unit, connected with the possibility of exchanging signals via communication lines with a moisture meter, densitometer, pump, fluid weighing unit, thermostat, paddle mixer and / or phase separation indicator.

The drawing shows a device for determining the water content in oil according to the patented invention.

The device consists of a sampler 1 with a phase separation indicator 2, a density meter 3, the input 4 of which is connected through the first valve 5 to the lower part 6 of the sampler 1, a full-flow moisture meter 7, the input 8 of which is connected through a pump 9 and a second valve 10 with the output 11 of the density meter 3, and the outlet 12 - with the upper part 13 of the sampler 1, and the node 14 of the liquid weighing, the receiving tank 15 of which is connected through the third valve 16 with the output 11 of the density meter 3.

The device also includes a thermostat 17 with a thermostatic jacket 18 located around the sampler 1, and a paddle mixer 19, installed with the possibility of mixing the liquid in the sampler 1.

The device may include a signal processing unit 20 connected with the possibility of exchanging signals through communication lines 21 with a moisture meter 7, densitometer 3, pump 9, liquid weighing unit 14, thermostat 17, paddle mixer 19 and / or phase separation indicator 2.

The method for determining the water content in oil is as follows.

Sampler 1 is thoroughly washed with gasoline, wiped dry with a soft cloth inside and out, and then weighed on a balance and its weight is determined without an oil sample m ₁ . The oil sample is thoroughly mixed and filled into it with a pre-weighed sampler 1, after which it is weighed with an oil sample and the mass of sampler 1 with an oil sample m _{2 is} determined. An oil sample is then defended until an oil-water boundary appears. To accelerate the settling process, a demulsifier, for example, a dissolvant or proxanol, in the amount of, for example, 1-3 g, is introduced into the oil sample before settling. To accelerate the settling process, sampler 1 with the oil sample can be placed in thermostatic jacket 18 of thermostat 17 and include a paddle mixer 19. Using a thermostat, heat the oil sample in the sampler to a temperature of 45-55 ° C, after which the paddle mixer is turned off and the oil sample is defended until the oil-water boundary appears by the phase separation indicator 2. Open 5, the first valve and the third valve 16 and the supernatant drained water into the receptacle 15 of weighing unit 14 of the liquid. Measure the density ρ _e and temperature t _{in the} drained water, taking readings of the densitometer 3. After the drain is finished, close the third valve 16 and determine the mass m of the _whole drained water.

Then opening the second valve 10, the pump 9 and the paddle mixer 19. Pump the oil remaining in the sample probosbornike representing an essentially water-oil emulsion, and stirred until a stable reading moisture 7. Determine the volume fraction of water in the w _e-water emulsion, ρ density _e and temperature t _e water-oil emulsion. The determination of the water content in oil m _{in is} made from the expression

where ρ = ρ _{vte in} [1-2 × 10 ^-4 (t _a -t _e)] - value quoted fusion water _density ρ measured at _a temperature t, temperature-water emulsion _e t.

Processing of the measurement results can be carried out manually or using the signal processing unit 20, which is a personal IBM compatible computer with appropriate software, which receives readings from the corresponding devices via communication lines 21.

The patented method and device can significantly improve the accuracy of determining the water content in oil and, thereby, increase the reliability of the evaluation work during oil production and distribution to the consumer.

Claims (10)

1. A method for determining the water content in oil, including filling the sampler with an oil sample, settling the oil sample until an oil-water boundary appears and determining the water content in oil, characterized in that before and after filling the sampler with an oil sample, it is weighed and determined mass without oil sample m ₁ and with oil sample m ₂ , and after sedimentation of the oil sample, the settled water is drained, weighed and its mass m _sun , density ρ _in and temperature t _{in the} drained water are determined, and the oil and water remaining in the sampler the emulsion is pumped through a densitometer and a hydrometer and the volume fraction w _{e of} water in the oil-water emulsion is determined, the density ρ _e and temperature t _{e of the} oil-water emulsion, and the determination of the water content in oil m _{in is} made from the expression

where ρ = ρ _{vte in} [1-2 × 10 ^-4 (t _a -t _e)] - value quoted fusion water _density ρ measured at _a temperature t, temperature-water emulsion _e t. 2. The method according to claim 1, characterized in that a demulsifier is introduced into the oil sample before settling. 3. The method according to claim 2, characterized in that as a demulsifier use a disolvant or proxanol. 4. The method according to claim 2, characterized in that the demulsifier is administered in an amount of 1-3 g. 5. The method according to claim 1, characterized in that the oil sample is heated before settling. 6. The method according to claim 5, characterized in that the heating is carried out to a temperature of 45-55 ° C. 7. A device for determining the water content in oil, including a sampler with a phase separation indicator, characterized in that it is equipped with a densitometer, the input of which is connected through the first tap to the bottom of the sampler, a moisture meter, the input of which is connected through the pump and the second valve with the output of the densitometer, and the outlet - with the upper part of the sampler, and a fluid weighing unit, the receiving tank of which is connected through the third tap to the outlet of the density meter. 8. The device according to claim 7, characterized in that it is equipped with a thermostat with a thermostatic jacket located around the sampler. 9. The device according to claim 7, characterized in that it is equipped with a paddle mixer installed with the possibility of mixing the liquid in the sampler. 10. The device according to claim 7, characterized in that it is equipped with a signal processing unit, connected with the possibility of exchanging signals via communication lines with a moisture meter, densitometer, pump, fluid weighing unit, thermostat, paddle mixer and / or phase indicator.