Method and device for sampling fluid from pipeline

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises setting the sampling member into the pipeline, separating the branch with inhomogeneous distribution of inclusions upstream of the sampling, directing the branch to the mixer for the intensive homogenizing, combining the flow branches, and sampling the combined flow. The device has sampling member, by-pass pipeline for branching the flow, and mixer. The mixer is mounted on the horizontal section of the pipeline between the inlet of the by-pass pipeline and its outlet for homogenizing the flow branch, which does not flow through the by-pass pipeline.

EFFECT: enhanced reliability of sampling.

2 cl, 4 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 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, the sample is proportional to the flow rate of the pipeline, in which the sample rate is chosen equal to the average flow rate of the pipeline [1].

A device for sampling fluid from a pipeline, comprising a sampling element of the one sampling tube with a bent end which is situated on the axis of the pipe inlet towards the flow [2].

The disadvantage of the known techniques of sampling - low representativeness of the sample, when the flow of the pipeline stratified.

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 stream, sampling proporz online 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 [3] (the prototype of the method).

A device for sampling fluid from a pipeline, comprising sampling an element from one sampling tube with a bent end which is situated on the axis of the pipe inlet towards the flow [4].

The disadvantage of the known techniques of sampling - low representativeness of the sample, when the flow of the pipeline stratified.

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

To achieve a technical result, in the method of sampling fluid from a pipeline, in which the placement of the sampling element in the pipeline, before sampling to produce a mixture of stream and then perform the sampling, according to the invention first stream pipeline is divided into parts, the part of the flow with inhomogeneous distribution of impurities is sent to the mixer for intensive homogenization with varying degrees of intensity, which is smaller, the lower the heterogeneity of the distribution of inclusions in this part of the thread, and then part of the flow from the mixer combine with other parts.

In the present method of sampling for the preparation of thread apply operations to complete the CSOs and efficient mixing. The latter is achieved by mixing flow by separating into parts and homogenization parts flow with varying degrees of intensity when the intensity of the mixing part of the flow the less, the less it is the heterogeneity of the distribution of inclusions. Sampling after the election mixing flow provides a more representative sample than on the prototype method [3] and with minimum loss of pressure in the mixing flow of the pipeline.

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 allow for more representative sampling.

To achieve a technical result, when implementing the proposed method uses a device that contains a suction element, the bypass pipeline to divert the flow and the mixer according to the invention, the mixer is mounted on the horizontal pipe section between the entrance to the bypass pipe and the output for the homogenization of the flow not passing through the bypass pipe, and before the intake element of the pipeline is made for mixing stream pipeline before sampling.

In the inventive device sampling for the preparation of the thread used is a separate estimate for fast and efficient electoral mixing. The latter is provided by transporting through the bypass pipeline upper layer flow with a relatively uniform distribution of inclusions in the flow, the homogenization of the lower layers of the flow of the pipeline, subject to stratification in the mixer installed on the main pipe between the outlet and the inlet of the bypass, followed by mixing parts of the stream by combining them at the entrance of the bypass in the main pipeline. Due to such a phase mixture flow in the inventive device the sample by the present method is more representative than the sample obtained using the device of the prototype [4].

Thus, the use of the inventive device will allow a more representative sample than the use of 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 for commercial metering of oil.

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

In the pipeline, which is under pressure in the transported liquid, carry out the placement of the sampling element, before sampling to produce the mixture flow, and the mixing flow carried out by dividing it n the part with the subsequent merger, when homogenization parts of the flow is carried out with varying degrees of intensity, which is the less than less in the received part of the flow of the heterogeneity of the distribution of inclusions; then select the sample; selected in probobally the sample is sent for analysis - determining the relative amount of ballast in the sample.

The invention is illustrated in the drawing.

Figure 1-4 shows four variants of the device for implementing the proposed method of sampling.

Device for sampling fluid from pipe 1 includes a sampling element 2 that is installed in the pipe 1 after the bypass pipeline 3 (next - line 3), the mixer 4, the passages 5 with the diameter of the pipe 1 to the diameter of the mixer 4, the connecting pipe 1 with a mixer 4 in the section between the inlet 6 and outlet 7 of the pipeline 3.

Transitions 5 can be concentric or eccentric connected with bends or turns.

Device for sampling fluid from the pipeline, Fig. 1, is intended for sampling from a flow pipe 1 under the influence of excess pressure in the pipe 1 relative to atmospheric. The pipe 3 is designed to divert part of the flow from the upper and middle strata of the pipeline 1 with a relatively uniform distribution of inclusions, so that in the mixer 4 conditions of which I am a part of the flow pipe 1 - mainly the lower layers of the pipeline 1 with inhomogeneous distribution of impurities was subjected to intensive homogenization. Section 8 of the pipe 1 between the input 7 of the pipeline 3 and the sampling element 2 serves to unify the parts of the flow pipe 3 and the mixer 4 and their mixing before sampling (it can be configured as a tube of variable cross-section).

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

During the transportation of liquids by pipeline 1 the upper and middle layers of the flow with a relatively uniform distribution of inclusions come in the pipe 3, and the remaining part of the flow pipe 1 with inhomogeneous distribution of impurities through the passage 5 is supplied to the mixer 4, in

where it undergoes intensive homogenization and further through the second downstream flow passage 5 flows into the pipeline 1. On the section 8 pipeline 1 part of the flow pipe 3 and the mixer 4 are combined and mixed. After mixing thread on the section 8 pipeline 1 out through the sampling element 2 select the sample.

For testing we used a device for sampling fluid from the pipeline, figure 1, with the following parameters.

The pipeline 1 is a horizontal diameter 159 mm Liquid pipe 2 was an oil emulsion with the average water content of 4.5%vol.; the viscosity of the water-free oil at 20°was 4 SP; the flow velocity in the pipeline 1-3,6 m/sec. Sampling element 2 was a tube inner diameter of 18 mm, the bent end of which is oriented towards the flow and is located on the axis of the pipeline 1. Mixer 4 consisted of 4 sections in the form of Venturi tubes, the length of each of which was 220 mm with a minimum diameter of 70 mm and maximum 103 mm; the total length of the mixer 4 was 1063 mm Transitions 5 - standard diameter DN 150 mm for DN 100 mm Diameter pipeline 3-119 mm, length 2000 mm Probsably 2 was installed on the pipeline 1 at a distance of 1000 mm from the entrance 7 of the pipeline 3.

Comparative tests of the proposed method of sampling fluid from the pipeline were carried out using a method of sampling [3] and devices [4] (data above).

The data of comparative tests of table. 1 (columns 3, 4, 5) confirm that the sample obtained by the present method, is characterized by high representative, and the process of mixing the flow of the pipeline can be carried out if splitting with homogenization them with different intensity.

The inventive method of sampling and device for its realization is industrially applicable for realizing the inventive technology changes can be carried out by manufacturers, service system is neither accounting pumped through pipelines liquid.

Sources of information

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

2. Device for sampling fluid from the pipeline./ GOST 2517, damn. 14.

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

4. Device for sampling fluid from the pipeline./ GOST 2517, damn. 14.

Table 1
No. of experimentThe parameters of the experiments
 The proportion of water flow, % vol.
The flow velocity in the pipe 1, m/sTrueDeclareThe placeholder
12345
13,64,54,42,1
2-“-4,44,51,8
3-“-4,54,31,9
4-“-4,34,31,7
5-“-4,64,52,2
6-“-4,44,31,6

1. Pic is b sampling fluid from the pipeline, at which carry out the placement of the sampling element in the pipeline, before sampling to produce a mixture of stream and then perform the sampling, wherein the first stream pipeline is divided into parts, the part of the flow with inhomogeneous distribution of impurities is sent to the mixer for intensive homogenization with varying degrees of intensity, which is smaller, the lower the heterogeneity of the distribution of inclusions in this part of the thread, and then part of the flow from the mixer combine with other parts.

2. Device for sampling fluid from a pipeline containing a suction element, the bypass pipeline to divert the flow and the mixer, wherein the mixer is mounted on the horizontal pipe section between the entrance to the bypass pipe and the output for the homogenization of the flow not passing through the bypass pipe, and before the intake element of the pipeline is made for mixing stream pipeline before sampling.



 

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