Sampling method of fluid from pipeline and device for its implementation

FIELD: oil and gas industry.

SUBSTANCE: sampling method of fluid from pipeline, at which sampling element with sampling hole is arranged in pipeline and sample is taken through the inlet with the specified flow. At that, passage of sampling hole is increased by the coefficient inversely proportional to 0.6-1, and sample is taken from the flow in the pipeline at average velocity proportional to average flow velocity in the pipeline with proportionality factor from interval of 0.6-1. Pipeline fluid sampling device includes sampling element installed diametrically in the pipeline with the sampling hole oriented towards the flow in the pipeline and made on side surface of sampling element; at that, passage of sampling hole is made in a certain way.

EFFECT: invention allows increasing representativity of the sample, improving the pump operation and reducing electric power consumption.

2 cl, 3 dwg, 1 tbl

 

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 a pipeline, wherein the pipeline is placed sampling element in the form of system 5 handsets input (system sampling holes, holes which are located on the pipeline diameter and separated from each other by 0.2 of the diameter of the pipeline, and the entrance to the Central tube is located in the center of the pipeline, and the diameters of the tubes from the center to the periphery are in the ratio 6:10:13, selection and pooling of samples [1].

A device for implementing this method, in which the pipeline is placed sampling element for sampling in the form of system 5 handsets entrance of the sampling holes, holes which are located on the pipeline diameter and separated from each other by 0.2 of the diameter of the pipeline, and the entrance to the Central tube is located in the center of the pipeline, and the diameters of the tubes from the center to the periphery are in the ratio 6:10:13 [2].

A disadvantage of the known techniques and technologies of sampling violation dynamics sampling, when the flow is non-uniform, as a consequence, neither the Kai representativeness of the sample. When transporting by pipeline stratified by phase flow, sampling tubes, which are immersed in the different phases of the flow, is proportional to the viscosity of each phase. The absence of mixing samples from tubes leads to not proportional to the sampling relative to the flow rate at the levels of selection. Therefore, the sample collected from well-known technique of sampling, is characterized by low representativeness.

There is a method of sampling fluid from the pipeline, which make posting on the pipeline sampling element from one tube to the input in the form of sampling holes on the side facing towards the flow, sampling with a given flow rate and at a speed equal to the speed of flow in the pipeline or differs from it in two times [3] (the prototype of the method).

A device for implementing this method includes sampling an element from one tube to the input in the sampling hole in the form of sampling holes on the side that is installed in the pipe facing towards the flow [4] (the prototype device).

The lack of data technologies and techniques of sampling - sampling element with a sampling hole on the side surface has a greater resistance to flow. This changes the field distribution of the IC is Rasta flow before sampling element, and meeting the requirements of the equality of the velocities of the samples at the entrance to the sampling hole and the flow must be considered taking into account the changed distribution of the velocity field of the flow prior to sampling hole. In addition, the implementation of sampling holes on the side wall of the sampling element leads to compression of the sample inlet and, as a consequence, additional pressure loss during sampling. Head loss can negatively affect the operation of the pump, if it is used to create excessive pressure required for sampling is required, the additional pressure drop across the sampling element to provide the desired sample flow and the pump is overloaded. As a result, not provided not only the necessary high-speed mode sampling, but the normal mode of operation of the pump, by means of which selected sample down to infringement procedures sampling or premature pump failure.

The technical result of the present invention is to restore the correspondence between the speed of sampling using the sampling element and the flow velocity near the side surface of the sampling element for sampling a representative sample, and the elimination of pump overload, creating excessive pressure drop across the sampling element with the bore of the sample.

To achieve a technical result, in the method of sampling fluid from the pipeline, which provide accommodation in the pipeline sampling element with a sampling hole, discrete, continuous to the side surface oriented (-s) towards the flow of the pipeline, sampling through the entrance with a given flow rate, according to the invention the sampling passage holes increase by a factor inversely proportional to 0.6 to 1, and the sampling of flow in the pipeline is carried out with an average speed that is proportional to the average flow velocity in the pipeline, with the proportionality of the interval 0.6 to 1; thus the sample with an average speed that is proportional to the ratio flow sampling holes is optimal (the ratio of the jet samples at the entrance to the sampling hole), is optimal.

When the sampling speed (hereinafter always is meant by speed average speed) at the entrance to the sampling hole, equal to the velocity of flow in the pipe, a compression of the sample, which affects the distribution of the velocity field take samples before sampling element 1, see figure 1, and generates this distribution of velocities. Increasing the width of the hole 2 and maintaining the flow of the sample, the field distribution is of Karosta in the flow of selected samples before sampling element, passing through the site SI, Sy, Scthat will not change. Thus, leaving unchanged the flow sampling and enlarging the hole to the coefficient inversely proportional to the ratio of the sample (or rate of flow of the original hole), increasing the width of the entrance of the sampling port 2 will not affect the distribution of the velocity field in the sample stream passing through the site SI, Sy, Scsee figure 2. Thus, by sampling from a condition of preservation of the sample flow and increasing the width of the sampling holes 2 by an amount not exceeding the maximum increase in hole - by a factor inversely proportional to the flow rate of sampling holes, which lies in the range of 0.6-1, the sampling will comply with the requirement isokinetic taking into account changes in the velocity field of the flow near the sampling element 1. This is the technology of sampling provides the inventive method, namely, when the sample is withdrawn from the flow in the pipe with an average velocity proportional to the average flow velocity in the pipeline, with the proportionality of the interval of 0.6-1.

In addition, when increasing the width of the sampling holes reduces the hydraulic resistance of the sampling element, this will decrease confused the d pressure when sampling at the sampling element. Thus, the sampling by the present method in comparison with the prototype [3] will provide a smaller pressure drop across the sampling element. While sampling at maximum magnification, the width of the sampling holes (within the stated interval) will provide the maximum reduction of hydraulic resistance sampling element will be optimal to reduce the pressure drop required for sampling and ensure isokinetic taking into account the modified velocity field of the flow near the sampling element. Thanks to the implementation of distinctive operations during sampling by the present method, in contrast to the prototype [3], provides the necessary speed of taking representative samples and more favorable conditions for normal operation of the pump with which it is supposed to create excessive pressure drop for sampling.

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

Application of the proposed method will provide the necessary speed sampling, corresponding to the sampling of the high representative, as well as to reduce the pressure loss and to improve the performance of a pump intended for sampling.

For the achievement of the program technical result when implementing the proposed method using the device which includes a sampling element, which is determined by the diameter of the pipeline with a sampling hole, oriented towards the flow in the pipeline and executed on the side surface of the sampling element according to the invention the passage of the sampling holes are made conditions so that the sampling of the flow in the pipeline was carried out with an average speed that is proportional to the average flow velocity in the pipeline, with the proportionality of the interval of 0.6-1 (or equivalent conditions under which the sampling area of the holes is chosen equal to the area of the living section of the jet samples).

As installed, when sampling using the inventive device, sampling the opening for sampling, in which facing towards the flow and made on the lateral surface of the sampling element, ensures compliance with mean velocities of flow in the pipe near the side surface of the sampling element and the sample flow rate at the entrance to the sampling hole. This is achieved when the sampling hole fulfill the condition that the sampling of the flow in the pipeline was carried out with an average speed that is proportional to the average flow velocity in the pipeline, with the proportionality of the interval of 0.6-1, for which the area of the sampling hole is ment by a factor inversely proportional to 0.6-1 compared with the area of sampling holes prototype [4]. This increase in the area of sampling holes in the inventive device reduces the hydraulic resistance of the sampling element. This ensures that the decrease in the differential pressure at the sampling at the sampling element and the load on the pump, if it is used to create excessive pressure drop for sampling. However, when the area of the sampling hole is equal to the area of the living section of the jet samples at its input in the sampling hole, that is, when the aspect ratio of the sample is equal to or approximately equal to the coefficient of discharge sampling holes (the ratio of the jet samples), minimizing the error of conformity (equality) of the flow velocity in the pipe near the sampling element from the entrance and speed sampling at the entrance to the sampling hole - this is the optimal condition to log on to the claimed device. Thus, thanks to the implementation of the above features of the proposed device, in comparison with the prototype [4]it is not only necessary correspondence between the average speed of the sample at the entrance to the sampling element and the average flow velocity in the pipeline, but sampling with a smaller pressure drop. Due to this, when the sampling of the true is aprovada using the inventive device, unlike prototype [4], provides the necessary speed for taking representative samples and more favorable conditions for normal operation of the pump, if it is supposed to carry out the sampling.

In the sample obtained using the inventive device will be more representative than the sample obtained using the device of the prototype [4], under more favorable conditions for the pump, which can create a pressure drop across the sampling element in the sample.

Thus, thanks to the implementation of the elements of the claimed device of the above conditions will be more representative sample of the inventive device when more favorable conditions for the pump, which can create a pressure drop across the sampling element for sampling (as opposed to device prototype [4]).

The inventive method of sampling fluid from the pipeline and device for its implementation can specifically be used, for example, in the oil industry - the commercial metering of oil.

The inventive method of sampling fluid from the pipeline is as follows.

In the pipeline, which transports liquid, place the sampling element from the sampling hole on the side surface in the form of holes (and is), oriented (-s) towards the flow of the pipeline, select the sample through the sampling hole with a specified flow rate with an average speed that is proportional to the average flow velocity in the pipeline, with the proportionality of the interval 0.6 to 1; however, to minimize the error between the average flow velocity near the sampling orifice and an average speed of sample entrance test taken at an average speed, the coefficient of proportionality that is set to equal to or close (settlement) the ratio of the jet samples at the entrance to the sampling hole (the coefficient of discharge sampling holes); next, the sample is sent for analysis.

The invention is illustrated by drawings, figure 1-3.

Figure 1 and 2 shows the streamlines of the fluid in the pipeline by the flow of the stream sampling element.

Figure 3 presents one of the variants of the claimed device for sampling fluid from the pipeline.

Device for sampling fluid from the pipeline (figure 1) includes a sampling element 1 with a sampling hole on the side oriented towards the flow in the pipe 3, additional pipeline 4, connected in series with the sampling element 1 and connected in parallel to the pipeline 3, the manual test is sbornik 5, the pump 6, the pressure gauges 7, the sample receiver 8, a flow meter 9.

Device for sampling fluid from the pipeline (figure 1) is designed for sampling: sampling element 1 serves for selection of the flow of the pipeline under the influence of excess pressure created by the pump 6; manual sampler 5 - for sampling in the sample receiver 8 manually from a part of the flow pipe 3, pumped through the sampling element 1 and connected in series with additional pipeline 4; gauges 7 to control the differential pressure generated by the pump 6 when sampling from the pipe 3 through the sampling element 1, the flow meter 9 to control the flow and speed take samples through the sampling element 1.

Device for sampling fluid from the pipeline (figure 1) works as follows.

During transport stream via line 3 is part of his under the influence of excess pressure generated by the pump 6 passes through the sampling element 1 in additional pipeline 4, the consumption and the rate of sampling is controlled by the flow meter 9; change of the differential pressure control using pressure gauges 7; additional pipeline 4 a sample selected using manual sampler 5 in the sample receiver 8.

For testing we used a device to which tbore fluid sample from the pipeline (figure 3) with the following parameters.

The pipe diameter 3 - 508 mm, the device-prototype [4] was calculated according to the patent [5], with the sampling hole, representing five slot on the side surface and the area of the entrance 642 mm2. The proposed device was similar to the prototype [4] the difference in the area, namely the entrance of the sampling hole was proportionally increased according to the patent [6] by a factor of the inverse of the coefficient k=0,6-1, see table. The value of the coefficient k=0.6-0.76 to correspond to the calculated one, which is equal to the ratio of the jet samples [8] and adopted for the calculation of the optimal area of the entrance of the inventive device when implementing the proposed method. The fluid in the pipe 3 was oil with a water content of 0.09 to 0.18%. The viscosity of the water-free oil at 20C was 4 cSt. The flow rate in the pipe 3 was 273,63 m3per hour, the flow of the sample through the sampling device was in both cases (claimed and prototype engineering sample) 0.92 m3/hour.

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], data also are summarized in table.

The data of comparative tests of the table confirm that the pressure drop in the sample decreased from 6 to 40% claimed SPO is trained, the quality of the sample increased, while for the optimal value of the square of the entrance pressure loss in the secondary line 4 (figure 3)decreased by approximately 28%. Thus, these experiments indicate the advantage of the inventive technique of sampling compared with the prototype [4], reduction of pressure loss will reduce the load on the pump and loss of power if the pump is supposed to apply to create excess pressure in the sampling, and the conversion rate of the sample through the sampling hole in accordance with the flow velocity near the entrance to the sampling element is to provide high quality samples.

The inventive method of sampling and device for its implementation industrially applicable - required change of the square of the input sampling elements can be carried out by manufacturers, serving sampling device and providing and controlling the technology of sampling.

No. of experimentThe value of the proportionality coefficient of the sample claimed method / area of the claimed device, mm2Ex. the water content of the flow in the pipeline, % vol. Water content, % vol., in the sample according to the method
The inventive method and devicePrototype [4]
10,95 / 6760,120,150,15
20,85 / 7550,090,110,13
30,74/ 8680,180,180,21
40,70/ 9170,120,110,15
50,64/10030,150,140,18
60,60/ 10700,120,100,15
Note - in the experiments, the pressure drop in the sampling at the sampling element on the claimed technology decreased from 6 to 40% (increase in accordance with increase in the number e is speriment).

Sources of information

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

2. Device for sampling fluid from the pipeline. / GOST 2517-85, cert.

3. The method of sampling fluid from the pipeline. / GOST 2517-85 with amendment # 1, certb).

4. Device for sampling fluid from the pipeline. / GOST 2517-85 with amendment # 1, certb).

5. Device for sampling fluid from the pipeline, patent No. 2141105, IPC G01N 1/10.

6. The method of sampling fluid from the pipeline and device for its implementation, patent No. 2144179, IPC G01N 1/10.

1. The method of sampling fluid from the pipeline, which provide accommodation in the pipeline sampling element with a sampling hole (discrete, continuous) on the lateral surface oriented (-s) towards the flow of the pipeline, sampling through the entrance with a given flow rate, wherein the sampling passage holes increase by a factor inversely proportional to 0.6 to 1, and the sampling of flow in the pipeline is carried out with an average speed that is proportional to the average flow velocity in the pipeline, with the proportionality of the interval 0.6 to 1; thus the sample with an average speed that is proportional to the coefficient of discharge sampling holes is the best.

2. The device DL the sampling of fluid from the pipeline, which includes a sampling element, which is determined by the diameter of the pipeline with a sampling hole, oriented towards the flow in the pipeline and executed on the side surface of the sampling element, characterized in that the sampling passage holes are made conditions so that the sampling of the flow in the pipeline was carried out with an average speed that is proportional to the average flow velocity in the pipeline, with the proportionality of the interval of 0.6-1.



 

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