Method of sampling hydrocarbon compositions from pipeline

FIELD: analyzing and/or investigating of materials.

SUBSTANCE: method comprises setting the sampling member and means for measuring the flow parameters into the pipeline, pumping a part of the flow through the sampling member, and determining the parameters of the flow.

EFFECT: enhanced reliability of sampling.

1 dwg, 1 tbl

 

The invention relates to the technology of sampling hydrocarbon compounds from the pipeline and may find application in the oil and other industries requiring precision determination of flow parameters of the pipeline system.

There is a method of sampling hydrocarbon compounds from the pipeline, which produce accommodation in the pipeline sampling element from one sampling tube with a bent end, which have inlet towards the stream; sampling 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 velocity in the piping system [1].

The disadvantage of this technology sampling - as determined experimentally, the selection of representative samples, it is important to ensure isokinetically selection, as determined by means of measuring the flux density depends on the flow rate and decreases or increases when the change in the flow rate of the flow relative to the flow rate value at which the measurement tool parameter was believed. In the result, it is impossible to simultaneously provide the flow rate through the means of measuring the density corresponding to the value at which it is believed the measuring tool and isokinetic sampling.

The known method of selection is and samples of hydrocarbon compounds from the pipeline, implemented in the sampling system, which is placed in the main pipeline having a flow regulator flow measurement tools and valves, intake element, they are displaced under the action of excess pressure of the flow of the pipeline through the mixer, placed in the additional pipeline sampling element, select a sample from a stream of additional pipeline, determine the parameters of pipelines by means of measurements or parameters of measurement [2] (the prototype of the method).

The disadvantage of this technology sampling - as determined experimentally, the selection of representative samples, it is important to ensure isokinetically selection, as determined by means of measuring the flux density depends on the flow rate and decreases or increases when the change in the flow rate of the flow relative to the flow rate value at which the measurement tool parameter was believed. In the result, it is impossible to simultaneously provide the flow rate through the means of measuring the density corresponding to the value at which it is believed the measuring tool and isokinetic sampling.

The technical result of the present invention is the implementation of rigorous quantitative and qualitative accounting of the flow of the pipeline by the combination of parameters.

To achieve the technical financial p is Tata in the way of sampling hydrocarbon compounds from the pipeline, at which carry out the placement of the suction element, the means of measurements of flow parameters, pumped air flow through intake pipe element, installed in the pipeline flow for measuring flow parameters in the intervals in which is conducted the verification or calibration, calibration, configuration tools, measurement, and determine the parameters of the flow in the pipeline or parameters of measuring flow parameters, and through the means of measurements of flow parameters set the flow rate to ensure that when sampling on a fence element flow from a given interval, according to the invention when changing the flow rate is correct, which provides an identical determination by means of measuring the flow parameter when its consumption, which was conducted verification or calibration, calibration, adjustment measurement tools.

It is found experimentally that for the selection of representative samples, it is important to ensure isokinetically selection, as determined for example by means of measurement [3] the flux density depends on the flow rate: it decreases with increasing flow rate relative to the value at which the measurement tool was believed, and when changing the flow rate in the other direction, it increases. Because the requirement isokinetic sampling about the s refers only to establish the appropriate value of the flow through probsably, the change of flow rate in the pipeline, subject to the requirements of the isokinetic sampling will lead to a change in flow rate through the means of measuring density. Therefore, the flux density of the pipeline with the method of the prototype [2] will be determined incorrectly. According to the proposed method defined by means of measuring the density will be amended, which compensates for changes due to the passing of a stream through a medium of density measurement with the flow, non-flow, which was carried out calibration of measurement tools. As a result, the proposed method provides compatibility requirements for sampling by probabilism and define flow gauge (measuring means). This is its advantage in comparison with the way the prototype [2].

Thus, the implementation of the above operations, the proposed method will allow more precise than that of the prototype method [2], taking into account the flow of the pipeline by the combination of parameters, measuring flux density and parameters defined by the test.

Application of the proposed method will allow more accurate quantitative and qualitative accounting of the flow of the pipeline implemented by the combination of parameters, to reduce the losses during trademark the commercial operations.

The inventive method of sampling may specifically be used, for example, in the oil industry - the commercial metering of oil.

The inventive method of sampling is as follows. In the pipeline, which is transported hydrocarbon compounds, produce placement of the pick up element, means for measuring flow parameters, carry out pumping under pressure excess part of the stream pipeline through the suction element, installed in the pipeline flow rate for measurement of flow parameters at known intervals, with (a) pre-through the means of measuring the flow parameter (e.g., density) set the flow rate at which the tool was believed; then b) through the means of measuring the flow parameter sets the flow rate of the known interval (which is isokinetically selection on a fence element part of the flow system piping), and in determined by means of measuring the parameter is adjusted, which provides an identical definition of the parameter of the flow when flow is established from the condition (a); measuring means to determine the flow parameters of the piping system, from intake element stream (sample) send in cumulative capacity for analysis - determination of the relative content score the hundred in the sample.

The invention is illustrated in the drawing.

The drawing shows one variant of the device for implementing the proposed method, which is specified by means of measurement is the density.

The device includes a suction element of the five intake tubes 1-5 with curved ends that are installed vertically on the pipe diameter (main) 6, the axis of the inlet 7 to 11 which are parallel to the longitudinal axis of the pipe 6, is directed towards the flow and separated from each other by a distance of 0.2 of the diameter of the pipeline, while the inlet of the Central tube 3 is located on the axis of the pipeline 6. The opposite ends of 1-5 are included in the mixing chamber 12. The diameters of the intake tubes 1-5 to the center pipe 6 are reduced in accordance with a ratio of 26:20:12; the device also includes a pipeline 13 (optional) to pump it part of the flow pipe 6, taken through the suction element system (tubes 1-5) pipe 6 under the influence of excess pressure, and return it to the pipeline 6; pipeline 13 sequentially connected to the mixing chamber 12; on the pipeline 13 is a regulator 14 flow rate for the adjustment through the measurement of flow parameters - a tool for measuring density 15 (used flow density [3]), temperature is ry 16, pressure 17, and the flow regulator flow 14 is located after the pressure taps 17 (the location is determined in the course of following the flow of the pipeline 13); sampling the line element 13 is located after the controller 14 of the flow rate and is a tube 18 with a curved end, the axis of the inlet 19 which is parallel to the axis of the pipe 13, while the inlet 19 is located on the longitudinal axis of the pipe 13 and is directed towards the stream; the output sampling tube 18 mounted faucet 20 and accumulation tank 21; monitoring the flow rate of the pipeline 13 is carried out by means of flow measurement 22; for the division of flow when determining the optimal flow through the means of measuring density 15 and amendment thereto, for the determination of density at non-optimal flow rate through the means of measuring density 15 before him the pipe 13 has a working 23 and the control 24 branching with a total area of 25, which is connected with the pipe 13 between the controller 14 of the flow rate and sampling tube 18; on the fork 23 of the pipe 13 mounted faucet 26, 24 - valve 27. Excessive pressure in the bypass pipe 13 and the intake system of tubes 1-5 created by aperture 28 located between the intake line element 6 and the end of labor is aprovada 13, located (along the flow) for the intake of the pipeline 6. The pipeline node 6, where there is only one way of measuring the flow rate of 30 pipe 6, is a constriction 29. The valve 33 is located at the end of the pipe 13.

Sampling device, see the drawing, is intended for sampling stream pipeline 6 in two stages: - the first is the selection of the flow pipe 6 through the system intake tubes 1-5, combining it into a single stream in the mixer 12 and then pumping it through a pipeline 13 (optional) with the subsequent return to the pipeline 6, the pumping part of the flow pipe 6 is realized under the influence of excess pressure, for creation of which is the aperture 28 of the pipeline 6; the second stage is the selection of the sample under the influence of excess pressure, which are selected sampling tube 18 from the flow pipe 13. Collect the sample serves as an accumulation tank 21. Isokinetically sampling from the pipeline 13 this sets the valve 20 or 33.

In parallel with the analysis of the sample is determined by temperature, pressure, density, flow pipe 6 by means of temperature measurement 16, pressure 17, density 15 (temperature and pressure are taken into account when determining density gauge density 15). Accounting flow pipe 6 is n is discontinuously when processing on the computer listed parameters flow (as also recalculation flux density to the pressure 0 MPa and a temperature of 20° (C) the program developed on the basis of normative documents, for example [3].

To separate the flow before measuring density 15 on the pipeline 13 is a fork 23, 25. Branching 23,25 pipe 13 serves to divide the flow at which shut-off valve 26 is open, and 27 closed, the consumption of part of the flow pipe 13, which passes through a medium of density measurement 15, temperature 16, pressure is 17, set by the controller 14 of the flow rate by means of measuring the flow rate of 22 permanent. The diameters of the intake tubes 1-5 below (determined from the conditions for the creation of flow rate, providing a tool for measuring density 15 in a given interval is determined by the passport means of measuring the density). Branching 23-25 and 24-25 pipe 13 are used to separate the flow pipe 13 before measuring density 15 and sequential control flow in the pipe 13 and the means of measuring density 15, and determine the optimal flow rate through the means of measuring density 15 and amendments when selecting the flow through the means of measuring density 15, different from the optimum. The flow rate is thus controlled by using measurement tools 22: when closed, the valve 26 open 27 determine the total discharge pipe 13, when open the tap 26 and the closed 27 determine the flow rate by means of density measurement 15. The use of the diaphragm 28 as a device to create a pipeline 13 overpressure allows for the desired flow rate through the suction element (intake tube 1-5) of the pipeline 6 and connected in series with him pipeline 13.

Device for sampling hydrocarbon compounds from a piping system operates as follows.

Part of the flow of the pipeline 6 (primary) under overpressure generated by means of the diaphragm 28, flows through the system intake tubes 1-5 in the mixer 12 and then pumped through a pipeline 13 (optional) with the subsequent return to the pipeline 6. Pre-flow pipe 13 before measuring density 15 is divided into two: one part of the flow is directed through the means of measuring density 15, temperature 16, pressure 17, the other bypasses the specified measuring instruments 15-17 for working fork 23, 25 of the pipeline 13 (when the valve 26 is open, and the 27 is closed). The constant flow rate through the means of measuring the density of 15 set by the controller 14 of the flow rate using the flow measurement flow 22 (specific cost values are given in the examples below). By means of density measurements 15, temperature 16, pressure 17 are determined by the flow parameters of the pipeline 13 - PL is Tosti, temperature, pressure. After passing the measuring 15-17 and working branching 23, 25 of the pipeline 13 is divided into two parts the flow pipe 13 before sampling tube 18 again combined into a single plot 32; however, the division of flow is to determine the optimal flow rate through the means of measuring density 15 and amendment in determining density gauge density 15 at a known flow rate through a thread other than the optimal (that is, to a certain gauge 15 density at a known flow rate through flow, different from the optimum, after adjusting for certain amendments coincided with the density determined by means of measurement 15 at the optimum, through him, the flow rate). Then through the means of measuring density 15 establish a known flow rate, different from the optimum, to determine the flux density of the measure 15. Known flow rate through the means of measuring density 15 set of conditions isokinetic sampling part of the flow pipe 6 through the intake element of the system intake tubes 1-5. Sampling tube 18 selected sample into the accumulation tank 21 for subsequent analysis. Produce accounting flow pipe 6 by the combination of parameters adjusted p the h flux (determined by means of measurement 15C-corrected) and the parameters determined by the sample accumulation tank 21.

The average speed of the selection of the product from the pipeline 6 intake (intake tubes 1-5) is determined by means of measuring 22 by closing the valve 26 and the opening 27. When closed, the valve 26 open 27 to control the flow rate through the means of measuring density 15.

For testing we used a device for sampling hydrocarbon compounds from a piping system (see drawing) below the estimated parameters.

The pipe 6 is horizontal, the diameter of which on the plot suction device from the system intake tubes 1-5 amounted to DN 400 mm, an Inner diameter of the pipeline 13-49 mm, sections 23 and 24 of 25 mm

Product pipeline 6 was an oil emulsion with the following parameters: water content of 0-0 .12% vol.; the viscosity of the water-free oil at 20°C - 18 SP; the flow rate of the pipeline 6 - 210.2 and 839.7 m3/hour.

The suction element for installation on the pipe 6 was a system of intake tubes 1-5, the diameter of which is decreased from the periphery to the center pipe 6 according to the value (in millimeters) 26 : 20 : 12, the internal diameter of the sampling tube 18 was 12 mm (diameter tubes 1-5, 18 for the claimed technology coincide with the diameters of the tubes 1-5, 18 suction device of the pipeline 6 to below the specified method and eliminate the STV [5-6], used for comparative tests). Means for measuring the flux density of 15 was continuous density [3]. The pressure in the pipe 6 was 0.8 MPa, the temperature of 24-30°C.

Comparative tests of the proposed method of extraction of hydrocarbon compounds were carried out using applied in the oil industry method of sampling [5], implemented using devices of sampling according to GOST 2517-85 [6]. The data of comparative tests of the claimed and known [5] the technology of sampling are given in table. 1.

Comparative experiments on density determinations reflected in columns 12 and 13. Reliability is presented in table. 1 data-dependent density flow was maintained due to the fact that the physico-chemical composition of flux during the experiments anhydrous stream (experiments No. 1-3, 7-9) and water flow (experiments No. 4-6, 10-12) was unchanged (conclusion based on the constancy of the three parameters - temperature, pressure and flux density). This was achieved due to the small length of time of the experiments (the time between the nearest experiments and the duration of each experiment did not exceed 3 min), during which the flow parameters of the pipes 6 and 13 is not changed. A fixed flux density was judged due to the high FOTS is izvedenosti density measurement, which measurement tools [3] does not exceed 0.02 kg/m3.

During the experiments it was found that the flux density determined by the present method, when to increase or decrease the flow rate through the suction element of the intake tubes 1-5 nearly constant - compare experiments No. 1 to 6 with No. 7-12 table. 1. The first series of experiments (No. 1-6) corresponds to the flow rate through the means of measuring density 15, less consumption of 5 m3per hour, which was carried out calibration of measuring density 15 (column 12 of experiments No. 1 to 6). In the second series of experiments (No. 7-12 table 1) the flow rate through the means of measuring density 15 was greater than 5 m3/hour. The density in the implementation of known technology sampling [5] in the first series of experiments increased by 0.15 kg/m3in the second series of experiments was reduced to 0.18 kg/m3(column 13 of table. 1). For the proposed method, the change in flux density amounted to only 0.02 kg/m3- (column 12 of table. 1).

Thus, in the proposed technology of sampling, in contrast to the known [5], does not increase or decrease determined by means of measuring the flux density when the speed changes, the selection of the flow on the suction element of the tubes 1-5, and because it will allow the optimum clicks the zoom accounting flow in the pipeline for all the parameters.

The inventive method of sampling is industrially applicable to its implementation does not require a radical reconstruction of the existing metering pumped through the pipeline system hydrocarbon compounds.

Sources of information

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

2. The method of sampling hydrocarbon compounds from the pipeline. GB 2164021 And class. G 01 N 1/10, published. 12.03.1986,, 6 C.

3. Recommendation. State system for ensuring the uniformity of measurements. Converters density production company "the SOLARTRON ELECTRONIC GROUP LTD (UK). The calibration methodology MI 23 0-1-95.

4. RD 39-0147103-343-89 "regulations on accounting and implementation of accounting and accounting operations when receiving and delivering oil”, 1989

5. The method of sampling hydrocarbon compounds from the pipeline./ GOST 2517-85 hell. 18, p.

6. Device for sampling hydrocarbon compounds from the pipeline./ GOST 2517-85 hell. 18.

The method of sampling hydrocarbon compounds from the pipeline, in which the placement of the suction element, the means of measurements of flow parameters, pumped air flow through intake pipe element, installed in the pipeline flow for measuring flow parameters in the intervals, to whom that is the verification or calibration, calibration, adjustment measurement tools and determine the parameters of the flow in the pipeline or parameters of measuring flow parameters, and through the means of measuring the flow parameter set the flow rate to ensure that when sampling on a fence element flow from a given interval, wherein when changing the flow rate is correct, which provides an identical determination by means of measuring the flow parameter, at his expense, which was conducted verification or calibration, calibration, adjustment measurement tools.



 

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