RU2215277C1 - Procedure of taking samples of liquid from pipe-line and device for its realization - Google Patents

Abstract

FIELD: sampling technology. SUBSTANCE: procedure can find use in oil producing and other branches of industry where high accuracy of determination of parameters of liquid pumped over pipe-line is required. Sampler is placed in pipe-line and samples are taken in compliance with procedure of taking samples of liquid from pipe-line. Flow blended in lateral section of pipe-line is blended with flow along pipe-line and they are aligned prior to sampling. Sample taking element of device sampling liquid from pipe-line is mounted on pipe-line with orientation of inlet hole in opposition to flow. Mixer manufactured from perforated pipe placed uniaxially with pipe-line and joined to block of sections narrowing and expanding laterally is placed in pipe-line ahead of sample taking element. EFFECT: high accuracy in quantitative and qualitative metering of liquid pumped over pipe-line that is carried out by combination of parameters. 2 cl, 1 dwg, 1 tbl

Description

 The invention relates to technology and techniques for sampling fluid from a pipeline and can find application in oil and other industries where high accuracy is required for determining the parameters of the fluid pumped through the pipelines.

 There is a method of sampling liquid from a pipeline, in which a sampling element is placed in the pipeline from one sampling tube with a bent end, which is placed on the axis of the pipeline with an inlet opening facing the flow; sampling is proportional to the flow rate of the pipeline, at which the sampling rate is equal to the average flow rate of the pipeline [1].

 A device for implementing this method is known, including a sampling element in the form of one sampling tube with a bent end, which is installed on the axis of the pipeline with an inlet opening towards the flow [2].

 The disadvantage of known sampling technologies and techniques is that if there is free gas in the flow, proportional sampling is violated. As a result, the sample is not representative.

 There is a method of sampling liquid from a pipeline, in which a sampling element is placed in the pipeline from one sampling tube with a bent end, which is placed on the axis of the pipeline with an inlet opening facing the flow; sampling is proportional to the flow rate of the pipeline, at which the sampling rate is not less than half and not more than double the average flow rate of the pipeline [3].

 A device for implementing this method is known, including a sampling element in the form of one sampling tube with a bent end, which is installed on the axis of the pipeline with an inlet opening towards the flow [4].

 The disadvantage of known sampling technologies and techniques is that if there is free gas in the flow, proportional sampling is violated. As a result, the sample is not representative.

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

 To achieve a technical result in the method of sampling liquid from a pipeline (main), in which a sample is placed in the pipeline, sampling according to the invention, before sampling, the flow is mixed, while the flow is mixed in the cross section of the pipeline (or piping system) with the operation of mixing the flow along part of the pipeline.

 The combination of mixing operations in the cross section of the pipeline flow and mixing the stream along a certain part of the pipeline allows not only to ensure uniform distribution of gas in the stream, but also to reduce its concentration and dispersion per unit volume of the stream. Synergism in mixing the flow contributes to the proportional sampling and obtaining its higher representativeness than in the prototype method [3].

 Thus, the implementation of the above operations of the proposed method will increase the representativeness of the sample in comparison with the prototype method [3].

 The application of the proposed method will allow for more accurate quantitative and qualitative accounting of the fluid pumped through the pipelines.

 To achieve a technical result in the implementation of the proposed method, a device is used that includes a sampling element installed on the pipeline with the inlet oriented towards the flow, according to the invention, a mixer is installed on the pipeline in front of the sampling element, which ensures mixing of the flow not only in cross section but also along some part the pipeline.

 The execution of the flow mixer from the condition of combining mixing operations in the cross section of the pipeline flow and mixing the stream along a certain part of the pipeline allows not only to ensure uniform distribution of gas in the stream, but also to reduce its concentration and dispersion per unit volume of the stream. Synergism in mixing the flow contributes to the proportional sampling and obtaining its higher representativeness than the prototype device [4].

 Thus, due to the implementation of the elements of the inventive device from these conditions, a more representative sample will be selected (in contrast to the prototype device [4]).

 The inventive method of sampling liquid from a pipeline and a device for its implementation can be specifically applied, for example, in oil fields - at commercial oil metering stations.

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

 In the pipeline through which the liquid is transported, a sampling element is placed, before which the flow is mixed both in the cross section of the pipeline and along the pipeline, after the mixing operation, a sample is taken, the selected sample is sent for analysis.

 The invention is illustrated in the drawing.

 The drawing shows one of the variants of the claimed device for sampling liquid from a pipeline.

 The device includes a sampling element 1 mounted vertically in the pipe 2 with an inlet opening facing the flow; the mixer from coaxially to the pipeline 2 located perforated pipe 3, docked with a block of alternately tapering and expanding sections 4, the crane 5.

 The sampling device is intended for sampling from the flow of the pipeline 2, while the sampling element 1 is intended for sampling after mixing the flow, the perforated pipe 3 of the mixer is used to mix part of the flow along the pipeline, the unit of alternately tapering and expanding sections 4 serves to mix the flow in cross section pipeline 2. Using a valve 5, the sampling rate through the sampling element 1 is regulated.

 A device for sampling fluid from a pipeline works as follows.

 The liquid transported through the pipeline 2 is mixed: when it enters the perforated pipe 3, the flow is mixed along part of the pipeline in the pipe section 3, then it enters the unit of alternately tapering and expanding sections 4, where it is mixed in the cross section of the pipeline 2; under the influence of excessive pressure in the pipeline 2 with the external environment, a sample is taken through the sampling element 1; the selection speed is regulated by a crane 5.

 For testing, a device was used for sampling liquid from pipeline 2 with the design parameters given below.

Pipeline 2 - horizontal with a diameter of 159 mm. The liquid of the pipeline 2 was an oil emulsion with a water content of 5-10 vol.%; the viscosity of anhydrous oil at 20 ^o C was 3 cP; pipeline flow rate 2-160 m ³ / hour. The length of the perforated pipe 3 was 50 mm, a diameter of 80 mm. The length of the sections is 4-320 mm, the diameter of the narrowing is 60 mm. The sampling element 1 was a tube with a bent end with a diameter of 6 mm, oriented by the inlet opening towards the flow of the pipeline 2 (device [4]).

 Comparative tests of the proposed method and device for sampling liquid from the pipeline were carried out using the sampling method [3] and the sampling device [4]. The implementation of the method was carried out using the sampling element 2 - in the absence of a mixing element 3. The data of comparative tests of the claimed and known (prototype [3-4]) sampling techniques are summarized in table.

 As shown by the test data when implementing the proposed method on the device (drawing), the proportionality of sampling and its representativeness were restored. Sampling only after mixing the flow in the cross section of the pipeline did not adequately ensure the proportionality of sampling and its representativeness (table).

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

 The inventive sampling method and device for its implementation are industrially applicable - they do not require radical reconstruction of existing metering units for liquids pumped through pipelines, and the changes necessary to implement the inventive technique can be carried out by the manufacturers who service these systems.

Sources of information
1. The method of sampling fluid from the pipeline. / GOST 2517-85. paragraph 2.13.1.2.

 2. A device for sampling liquid from a pipeline. / GOST 2517-85, clause 2.13.1.2, damn. 14.

 3. The method of sampling fluid from the pipeline. / GOST 2517-85. paragraph 2.13.1.3. 2.13.1.7.

 4. A device for sampling liquid from a pipeline. / GOST 2517-85, p.2.13.1.7, damn. 14.

Claims (2)

 1. A method of sampling liquid from a pipeline, in which a sample is placed in the pipeline and a sample is taken, characterized in that before sampling, the flow is mixed in the cross section of the pipeline and the flow is mixed along the pipeline.  2. A device for sampling liquid from a pipeline containing a sampling element mounted on the pipeline with the orientation of the inlet towards the flow, characterized in that a mixer is installed on the pipeline in front of the sampling element, made of a perforated pipe arranged coaxially with the pipe and made transversally aligned with the block tapering and expanding sections.

Images