Method of sampling of product from the pipeline and device for its implementation

 

The invention relates to techniques for sampling fluid from the pipeline and can be used in the oil and other industries where high precision of the fluid. In the method of sampling fluid from the pipeline part of the flow pipe is transported under the influence of excess pressure through the channel connecting the pipe with an automatic sampler, and carry out the sampling. First pre-determined pressure drop in the channel where the velocity of flow in the channel you have selected more than half of the flow rate of the pipeline. Then the velocity of flow in the channel is adjusted, based on the established pressure differential. Device for sampling fluid from the pipeline contains a channel connecting a pipeline with an automatic sampler and the sample receiver, and shutoff valves. The device has established channel valve and a drain valve installed on the pipe with a crane for the preliminary determination of the pressure drop in the channel where the velocity of flow in the channel corresponds to a rate of flow of the pipeline and subsequent reg the next sampling of the flow of the pipeline. The invention provides a representative sampling of pumped through pipelines liquid. 2 S. p. f-crystals, 1 Il., 1 PL.

The invention relates to the technology and technique of sampling fluid from the pipeline and may find application in the oil and other industries where high precision of pumped through pipelines liquid.

There is a method of sampling fluid from the pipeline, which produce accommodation in the pipeline sampling element from one sampling tube with a bent end which is situated on the axis of the pipe inlet towards the flow, manual sampling is proportional to the flow rate of the pipeline at which sample rate is not less than half and not more than double the average flow rate of the pipeline [1].

A device for implementing this method, including sampling element in the form of one sampling tube with a curved end, which is mounted on the axis of the pipe inlet towards the flow [2].

A disadvantage of the known technique of sampling: in the case of sampling manually is difficult to control the quality of the of tbor fluid sample from the pipeline, when producing the accommodation in the main intake pipe element, pumping under the influence of excess pressure through the suction element and connected in series with it the auxiliary pipeline is part of the flow of the main pipeline, placement in the auxiliary pipeline sampling elements, manual sampling through one of the sampling elements, the connection channel of the other sampling element with an automatic sampler and the auxiliary pipeline, the sampling automatic sampler from this channel, which continuously moves the part of the flow of the auxiliary pipeline [3] (the prototype of the method).

A device for implementing this method includes a suction element mounted in the pipeline, connected in series with the auxiliary pipeline to pump it part of the main liquid pipe taken through the suction element of the main pipe under the influence of excess pressure, a device for creating excess pressure in the auxiliary pipe and the intake element of the main pipeline in the auxiliary pipeline is installed sampling elementstack data technologies and techniques of sampling - low representativeness of the sample, obtained by automatic sampler is due to the lack of monitoring and regulating the speed of flow in the channel connecting the auto sampler with auxiliary pipeline, the flow velocity in the channel, usually very small (created by the velocity head of flow of the auxiliary pipeline), and is not responsible calculated (isokinetic), and differs from it much more.

The technical result of the present invention is to increase the representativeness of the sample.

To achieve a technical result, in the method of sampling fluid from a pipeline, in which part of the flow pipe is transported under the influence of excess pressure through the channel connecting the pipe with an automatic sampler, the sampling according to the invention in the absence of a counter, which determines the flow rate in the channel, the sampling automatic sampler is carried out at the pressure drop in the channel is equal to the pressure drop in the channel (for example, equal pressure drop in the channel when it is created relative to the ambient pressure), as determined from the condition of maintaining a business flow velocity the velocity of the STI pipe), or choose from the interval isokinetic (more than half of the isokinetic speed).

In the present method selected by the automatic sampler sample is taken from the channel connecting the auto sampler with the pipe in which the flow rate corresponds to an estimated (e.g., isokinetic or close to it) is comparable to the velocity of flow in the pipeline. In the sample obtained by the present method, will be more representative than the sample obtained by the method-prototype [3] (where the flow velocity in the channel connecting the auto sampler with the pipeline, significantly lower isokinetic (due to the large hydraulic resistance of the channel due to the small diameter of the channel)).

Thus, the operations of the proposed method will allow for a comparison with the method prototype [3] to improve the representativeness of the sample.

Application of the proposed method will allow for representative sampling, to reduce fluid loss during metering operations.

To achieve a technical result, when implementing the proposed method uses a device that includes a channel connecting the pipe with the automatic is Otok in the channel, pump for transporting the flow in the channel the device is made of the conditions for regulating the flow in the channel at a given flow rate in the pipeline.

In the inventive device, select automatic sampler sample is taken from the channel connecting the auto sampler with the pipe in which the flow rate can be set isokinetic or close to it due to the fact that the device is made of the conditions for regulating the flow in the channel at a given flow rate in the pipeline. In the sample, obtained by the claimed device, will be more representative than the sample obtained by the device-prototype [4] (when sampling which the flow velocity in the channel connecting the auto sampler with the pipeline, significantly lower isokinetic (due to the large hydraulic resistance of the channel due to the small he-diameter)).

Thus, the claimed device, thanks to its distinctive features will allow the selection of a more representative sample (in contrast to devices of the prototype [4]).

The inventive method of sampling fluid from the pipeline and device for its implementation can specifically is about fluid from the pipeline is as follows.

The pipeline, which transports fluid, connect using a channel with automatic sampler installed in the channel pressure drop, which is equal to the pressure difference between the pressure in the pipeline and the environment and at which the rate of flow in the channel corresponds isokinetic (or more than half of isokinetic), and select a sample of an automatic sampler. Selected into the sample receiver, the sample is sent for analysis - determining the relative amount of ballast in the sample.

The invention is illustrated in the drawing.

The drawing shows one variant of the inventive device for sampling fluid from the pipeline.

The device includes a channel 1 connecting the auto sampler 2 with line 3, valve 4, mounted on the end of the channel 1, the valve 5 is mounted on the pipe 3 between the beginning of the 6th and the end 7 of the channel 1, the gauges 8 and 9 installed on the pipeline 3 respectively opposite connection points (6 and the beginning of the end (7) of the channel 1 with the pipe 3, the sample receiver 10, the drain valve 11 installed before the valve 4, a measuring tank 12 for receiving fluid from the drain valve 11 and valve 13 for adjusting the flow rate and pressure in the pipe 3.

here in the channel 1 corresponded to the velocity of the fluid in the pipeline 3), who should be on the gauges 8 and 9. The differential pressure is determined as follows using auxiliary elements - valves 4, 11 and a measuring tank 12, the valve 4 is closed and thereby cut off the flow channel 1 from line 3, by opening the drain valve 11, to produce the filling of the measuring vessel 12. At the time of filling of the measuring vessel 12 and the cross-section of the channel determine the flow rate in channel 1. If necessary adjust by changing the pressure in the pipe 3 by adjustment of the valve 13, so that the velocity in the channel 1 coincided with the calculated flow rate in the pipe 3. The corresponding differential pressure between the pressure in the pipe 3 and the external environment) on channel 1 read on a pressure gauge 8. Then probsably include work - auxiliary cranes result in a corresponding position - drain valve 11 must be closed and the valve 4 is fully open.

Sampling device is intended for sampling flow pipe 3 by means of an automatic sampler 2 connected to the pipe 3 by means of channel 1, in which: the valve 5 serves to adjust the pressure drop in channel 1; adjustment of the differential pressure gauges 8 and 9 are used for control, to clean the

Device for sampling fluid from the pipeline works as follows.

Before transporting the known velocity of the fluid through the pipeline 2 pre-determine the pressure drop in channel 1, in which the velocity of flow in the channel 1 corresponds to the velocity of the flow pipe 3. For this purpose, the channel 1 close the valve 4 and fully open the drain valve 11 and the control valve 13 set the differential pressure in the pipe 3 with respect to the external environment in which the velocity of flow in the channel 1 corresponds to the known speed of transportation of liquids by pipeline 3 is the flow velocity in the channel 1 is determined proceeding from the time of filling of the measuring vessel 12 and the flow area of channel 1. Then close the drain valve 11 fully open the valve 4 for the flow part of the flow pipe 3 on channel 1 and return it to the pipeline 3. Control valves 13 and 5 on the line 3 restore the operating pressure and the flow velocity in the pipe 3, in which the pressure drop in channel 1, defined as the difference of the readings of the pressure gauges 8 and 9 is set to a specific, that is, when the velocity of flow in the channel 1 corresponds to C is th speed on channel 1 part flow line 3 selects the sample into the sample receiver 10. Upon completion of sampling, the sample receiver 10 transmits to the laboratory for analysis.

For testing we used a device for sampling fluid from the pipeline (see drawing) below the estimated parameters.

Line 3 - the internal diameter of 24 mm. Transported via the pipeline 3 liquid oil with a water content of about 1-3.%; the viscosity of the water-free oil at 20 degrees Celsius was 4 SP; the flow rate of the pipeline 3-1,8 m/sec. channel Diameter of 1-6 mm, the temperature of the flow of the pipeline 3-38S; density of water-free oil, reduced to 20C at a pressure of 0 MPa, was 823,5 kg/m3. The sampling system was installed automatic sampler Probe-1M” (Manufacturer factory “BOSNA”, , Bugulma, Tatarstan). To exclude hydraulic losses was used ball valves 4, 5, 11, 13 with a passage corresponding to the diameter of the pipeline 3 and channel 1.

Comparative tests of the proposed method and devices for sampling fluid from the pipeline were carried out using a method of sampling [3] and sampling [4], the difference of which from the claimed device at the site include automatic sampler 2 - Otsu is testing the claimed and known (prototype [3-4]) techniques of sampling are summarized in table.

The representativeness of the sample for method and device [3-4] (prototype), obtained by automatic sampler, 25-35% lower compared to the representativeness for the claimed technology - compare columns 3 and 4 of the table.

According to experiments, it follows that in the absence of channel 1 must flow velocity close to the speed of the fluid in the pipe 3, and the prototype [3-4] the flow rate in channel 1 by one to two orders of magnitude lower (because of the pressure drop in the channel there is little, and the hydraulic resistance of the channel 1 is high due to its small diameter and 6 mm), the representativeness of the samples taken by an automatic sampler 2, low. The inventive method and device can solve the problem isokinetic transportation part of the flow pipe 3 on channel 1 in the absence of counter flow channel 1 and perform representative sampling.

Thus, the data of comparative tests of the table confirm that the sampling of the flow of the pipeline by the present method and device, in contrast to the sampling of the prototype [3-4], provides a more representative selection.

The inventive method of sampling and device for realization of industrial liquids, as necessary to implement the inventive technique changes can be carried out by manufacturers serving these systems.

Sources of information

1. The method of sampling fluid from the pipeline/ GOST 2517-85. p. 2.1.13.1.3, 2.13.1.7.

2. Device for sampling fluid from the pipeline/ GOST 2517-85, p. 2.13.1.7, damn.14.

3. The method of sampling fluid from the pipeline/ GOST 2517-85. Damn.18.

4. Device for sampling fluid from the pipeline/ GOST 2517-85. Amendment # 1. The amendment, damn.18b), table 2.

Claims

1. The method of sampling fluid from a pipeline, in which part of the flow pipe is transported under the influence of excess pressure through the channel connecting the pipe with an automatic sampler, and carry out the sampling, wherein the first pre-determined pressure drop in the channel where the velocity of flow in the channel you have selected more than half of the flow rate of the pipeline, then the velocity of flow in the channel is adjusted, based on the established pressure differential.

2. Device for sampling fluid from a pipeline containing a channel connecting a pipeline with automatic ProBook and a drain valve installed on the pipe with a crane for the preliminary determination of the pressure drop in the channel, when the velocity of flow in the channel corresponds to a rate of flow of the pipeline and subsequent regulation of the velocity of the flow in the channel to match the flow rate in the pipeline and the possibility of subsequent sampling of the flow of the pipeline.

 

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