The method of sampling fluid from the pipeline

 

The invention relates to techniques for sampling fluid from the pipeline and may find application in the oil and other industries where high precision of the fluid. In the method of sampling fluid from the pipeline distribution of inclusions in the pipe cross section at different parts of the pipeline is determined by two sets of gravitational and inertial forces. When the process is placed in the pipeline probsably designed for sampling from a stream, in which the distribution of inclusions in the cross-section of the pipeline due to gravitational force. Probsably place in the vertical plane at the location of the pipeline, where the impact on the distribution of inclusions in the flow under the influence of gravitational and inertial forces provides a symmetric distribution of inclusions in the stream relative to the vertical plane. The invention allows to select a representative sample. 2 Il., table 2.

The invention relates to the technology and technique of sampling fluid from the pipeline and may find application in the oil and other traslate.

There is a method of sampling fluid from the pipeline, which produce accommodation in the pipeline promotability and carry out the sampling in proportion to the flow rate of the pipeline, in which the sample rate is chosen equal to the average flow rate of the pipeline [1].

There is a method of sampling fluid from the pipeline, which produce accommodation in the pipeline promotability and carry out the sampling in proportion 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 [2] (the prototype).

A disadvantage of the known technologies of sampling - low representativeness of the sample. This is a consequence of neglecting forces, in different ways affects the distribution of the dispersed phase in the flow cross section of the pipeline. In areas of changing the direction of flow prevailing in the distribution of the dispersed phase flow can be inertial force of the stream. On straight pipe sections are quite remote from the sites of rotation, the predominant effect on the distribution of the dispersed phase flow exert gravitational forces even under the condition of turbulent flow [5].

Technology in the achievement of the technical result in the method of sampling fluid from the pipeline, in which the distribution of inclusions in the pipe cross section at different parts of the pipeline is determined by the known two sets of forces, and which includes accommodation in the pipeline probabilita designed for sampling from a stream, in which the distribution of inclusions in the pipe cross section due to the first of two sets of forces in accordance with known rule placement in the pipeline, sampling, according to the invention probsably put in place a pipeline, where the impact on the distribution of inclusions in the flow under the influence of the second aggregate minimum forces or contributes to a symmetrical distribution of the inclusions relative to the vertical plane.

In the present method probsably designed for sampling from a stream, the distribution of inclusions in the cross section of which is due to the action of the first of two sets of forces, mounted on respective of the population forces the location of the pipeline, namely, when the distribution of inclusions in the flow cross section is determined by the first set of forces (or if the second set of forces shows the effect on the distribution of inclusions is Finance promotability in accordance with its purpose enables higher representativeness of the sample, than on the prototype method [2].

Thus, implementation of the proposed method will allow for a comparison with the method of the prototype [2] to improve the representativeness of the sample.

Application of the proposed method will allow more accurate quantitative and qualitative accounting pumped through pipelines of liquid produced by the combination of parameters, to reduce losses by commodity and commercial operations.

The inventive method of sampling fluid from a pipeline may 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, in which the distribution of inclusions in the pipe cross section at different sites is determined by a known two sets of forces, probabry designed for sampling from a stream, for which the distribution of inclusions in the pipe cross section due to the first set of forces, established on the site of the pipeline, where the distribution of inclusions in the pipeline is determined mainly by this combination of forces, carry out sampling in probobally, after che is the ETS for the implementation of the proposed method of sampling: Fig.1 - the pipeline in a vertical plane; Fig.2 - pipe in the horizontal plane.

Device for sampling fluid from the pipeline (Fig.1) includes probability 1 and 2 on the vertical pipe section 3 and probsably 4 on the horizontal pipe section 3, the valves 5 to adjust the speed of sampling.

The device according to Fig.1 is intended for sampling.

Probability 1 and 6 represent a tube with a bent end, the opening positioned on the axis of the pipe and directed towards the flow [3]. The valves 5 are used to adjust the speed of sampling through probability 1, 2, 4, 6. Probsably 6, located on a horizontal pipe section 3 provides for sampling according to the method of the prototype [2]. Probability 1 and 6 are for sampling from a uniform flow of the pipeline, when the action of gravitational forces on the stratification of the flow is minimal, and the uniformity of the distribution of inclusions in the pipe cross section of flow is determined by the hydrodynamic forces of the stream.

Probability 2 and 4 represent a tube with a slit opening directed towards the flow, which on the horizontal pipe sections raspotnik or non-uniform flow of the pipeline, when the direction of inertial forces lies in the same plane with gravity [4].

The device according to Fig.1 operates as follows. On line 3 transport stream. Under the influence of excess pressure in the external environment with vertical and horizontal sections of pipe 3 through one of probabilitv 1-2 or 4 carry out the sampling in probobally, speed sampling regulate crane 5; then the sample is sent for analysis.

Device for sampling fluid from the pipeline (Fig.2) includes probability 1 and 2 in a horizontal pipeline 3 installed vertically: 1st - to 2nd - after the turn of the pipeline 3, cranes 4.

The device Fig.2 is intended for sampling.

Probability 1 and 2 represent a tube with a slit opening directed towards the flow, which on the horizontal pipe sections arranged vertically [4]. This type of promotability is designed to select a representative sample from a uniform or non-uniform flow of the pipeline, when the action of the inertial forces of the minimum flow or when their direction in one plane with gravity.

Probsably 5 is similar to probabilita 1 and 2 and designed the pipeline 3 transport stream. Under the influence of excess pressure in the external environment with the horizontal part of the pipeline 3, before or after rotation through one of probabilitv 1 or 2 carry out the sampling in probobally, speed sampling regulate crane 4; selected sample sent for analysis.

During testing it was used the device for sampling fluid from the pipeline in Fig.1 and 2 with the following parameters.

Pipeline 3 - diameter 159 mm Liquid pipe 2 was an oil emulsion with an average water content of about 15 vol.%; the viscosity of the water-free oil at 20With 8-12 JV; the flow velocity in the pipe is about 2 m/s

When implementing the proposed method on the device according to Fig.1 when sampling from a vertical pipe section 3, on which the action of inertial forces flow and gravity on the distribution of inclusions in the pipe cross section is minimal (inertial force of the flow is zero, since the movement of the rectilinear flow at the site of placement of probabilitv 1 and 2, and the direction of gravitational force coincides with the direction of flow) and is completely determined by the hydrodynamic forces of the flow (hydrodyna representative sample (table.1). Representative sample and when the sample through probsably 4 (PL.1) designed for sampling from a stream, stratified under the influence of gravity - direction inertial force of the stream on the site paparata pipeline 3 from vertical to horizontal sections lies in the same plane with the gravitational force, so the action of inertial forces, flow stratification similar to the effect on the stratification of the flow of gravity. The implementation of the method of the prototype [2], the sample is selected through probsably 6, designed for sampling from a uniform flow [3] (when the action of inertial forces, flow and gravity on the distribution of inclusions in the cross-section of the pipeline should be minimal), is not adequately representative samples (table.1), because the plot of rotation under the influence of inertial forces flow and gravity flow stratified early part of the rotating pipe 3 under the influence of gravitational and inertial forces of the flow area of the pipeline bend 3 they maximum).

When implementing the proposed method on the device according to Fig.2 when sampling with the horizontal part of the pipeline 3 is determined by the gravitational force [5], and sampling through probsably 1, designed for sampling from a stream, stratified under the influence of gravitational forces [4], provides a high representativeness (table.2). The implementation of the prototype method [2] in the device according to Fig.2, a sample is taken through the same slit probsably 4, - does not provide a high representativeness (table.2) because probsably 4 is located at a distance of two diameters of the pipeline from the turn - on distance of 300 mm, where the stratification of the flow is principally determined by the inertial forces of flow on the section of the pipeline bend 3 90. It was established experimentally that at a distance of 30-35 diameters of the pipeline from the site of the turning effect of stratification of the flow under the influence of inertial forces of flow on the plot turning on the distribution of inclusions in the pipe cross section is zero and the sampling at this distance through the same sampler 2 provides the necessary representativeness of the sample (table.2). That is, when placed in the pipe 3 probabilita 2 at a distance of 30-35 diameters of the pipeline 3 turn the stratification of the flow in the pipe cross section 3 is mainly determined by gravitas the tests (table.1 and 2) confirm, the sampling of the flow of the pipeline by the present method, in contrast to the sampling of the prototype [2], provides a more representative selection. Thus, placing probabilita on the pipeline in accordance with the inventive method with regard to the forces that determine the stratification of the flow, provides the selection of representative samples.

The inventive method of sampling is industrially applicable - it does not require a radical reconstruction of the existing metering pumped through pipelines liquids as necessary to implement the claimed engineering calculations and tests for placement probabilitv 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. 2.13.1.1, 2.13.1.2.

2. The method of sampling fluid from the pipeline. GOST 2517-85, p. 2.13.1.1, 2.13.1.3.

3. GOST 2517-85, p. 2.13.1.7 hell. 14, p. 1.5.2.

4. Amendment # 1 GOST 2517-85 hell. 15 (a), PL.1, p. 2.13.1.8.

5. The oil industry. M.: Nedra, 1980, No. 1, S. 45.

Claims

The method of sampling fluid from a pipeline in which the distribution vkljucenosti - gravitational and inertial forces, which includes accommodation in the pipeline probabilita designed for sampling from a stream, in which the distribution of inclusions in the pipe cross section due to the gravitational force at a known rule of placing the sampler in the pipeline, and a sample, characterized in that probsably place in the vertical plane at the location of the pipeline, where the impact on the distribution of inclusions in the flow under the influence of gravitational and inertial forces provides a symmetric distribution of inclusions in the stream relative to the vertical plane.

 

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