RU2141105C1 - Device for taking liquid samples from pipeline - Google Patents

Abstract

FIELD: examination and analysis of materials. SUBSTANCE: device has sampler positioned in pipeline with sampling hole opposite to flow. Device includes outlet assembly arranged on top, on horizontal or inclined section of pipeline. Sampler is made as tube with sampling hole on side surface. Average value of tube wall thickness on side of hole does not increase from point of sampling tube arrangement in pipeline, and it is not more than 5 mm. Sampling hole is determined by equations by means of width B_j at distance H_j from pipeline generating line positioned from diametrically opposite side relative to outlet assembly. parameters B_j and H_j are determined by equations with i varying from 1 to 9 for continuous and discrete sampling holes. Sampling hole width is monotone function and is selected to be not less than

, where G=9 mm; D_{nom o}=100 mm. Permissible deviation of hole width from the rated one is not over 0.2 mm, distance H_j does exceed 10 mm, rounding radius of sampling hole pointed sections is from 0 to 5 mm. Lower end of tube carries stabilizer, width X_n of which at distance Y_n from lower boundary of hole is determined by rated formula. Value Y_n is also found from rated formula. Deviation of parameters X_n,Y_n from rated values does not exceed 5 mm. Device allows accurate quantitative and qualitative accounts of liquid pumped through pipelines. EFFECT: true sampling. 6 tbl, 4 dwg

Description

 The invention relates to techniques for sampling liquids from a pipeline and can find application in oil production, oil refining and other industries where high accuracy in determining impurities is required.

 A device is known for sampling liquid from a pipeline, including a system of three sampling tubes of the same diameter, installed between the flanges by means of a plate with inlet openings facing the flow, one of which is located on the axis of the pipeline, and the other two are separated from it at a distance of 0.66 of the radius of the pipeline ( Sampler GOST 2517-85 / p. 2.13.1.11/. [1].

 A disadvantage of the known sampling technique is the violation of the dynamics of sampling due to clogging of the sampling holes, and, as a consequence, the deterioration of the representativeness of the obtained sample. As practice shows, when applying the well-known sampling technique, partial or even complete silting of one or two sampling openings often occurs after 2-3 months of operation. In addition, there is a large dependence of the representativeness of the sample on the stratification of the flow, for example, under the influence of gravity.

 A device is known for sampling liquid from a pipeline, including a sampling element of five sampling tubes, the outlet assembly of which is located on top of the pipeline, while the axes of the inlet openings of the sampling tubes are parallel to the axis of the pipeline, directed towards the flow and removed from each other by a distance of 0.2 pipe diameters, while the inlet of the Central tube is located on the axis of the pipeline. The opposite ends of the tubes enter the mixing chamber, from which the sample is sent for analysis to the quality control unit. The diameters of the sampling tubes to the center of the pipeline are reduced in accordance with a ratio of 13: 10: 6 (Sampler. GOST 2517-85 / p. 2.13, drawing 15 /). [2].

 A disadvantage of the known sampling technique is the violation of the dynamics of sampling due to clogging of the sampling holes, and, as a consequence, the deterioration of the representativeness of the obtained sample. As practice shows, when applying the well-known sampling technique, partial or even complete silting of one or two sampling openings often occurs after 2-3 months of operation. In addition, there is a large dependence of the representativeness of the sample on the stratification of the flow, for example, under the influence of gravity.

 The technical result of this invention is to increase the reliability of obtaining a representative sample by reducing the influence of factors contributing to clogging of the sampling hole, as well as improving the convenience in the manufacture and operation of sampling devices.

где G= 9 мм, D_yo = 100 мм; допустимое отклонение ширины отверстия от расчетного - не более 0.2 мм, расстояния H_j - не более 10 мм; радиус закругления заостренных участков пробозаборного отверстия - от 0 до 5 мм; на нижнем конце пробозаборной трубки устанавливается стабилизатор, который изменяет поперечное сечение пробозаборной трубки так, что в поперечном сечении трубопровода ширина стабилизатора X_n на расстоянии Y_n от нижней границы пробозаборного отверстия определяется по формуле
X_n = d₁ - 0,2 - (d₁ - 1,2)•(0,1• (n-1))^0.5, (9)
a Y_n определяется равенствами
Y_n = 12,2•(n-1), (10)
если условный диаметр трубопровода D_y больше или равен 350 мм;
Y_n = 0,0348571•(n-1)•D^y, (11)
если D_y < 350 мм;
номер n изменяется от 1 до 11, при этом отклонение параметров X_n и Y_n от рассчетных составляет не более 5 мм.To achieve a technical result, in a device that includes a sampling element installed in the pipeline with a sampling hole (continuous, discrete) facing the flow, the outlet of the sampling device located on top of a horizontal, inclined section of the pipeline, according to the invention, a sampling tube is used as a sampling element hole on the side surface, the average value of the wall thickness of which on the execution side of the sampling hole does not increase from of the placement of the sampling tube in the pipeline and does not exceed 5 mm, while the sampling hole is defined by the width B _{j of the} sampling hole at a distance H _j from the generatrix of the pipeline located on the diametrically opposite side relative to the outlet of the sampling device, as follows:
if the sampling hole is continuous, then the parameters B _j and H _j when changing the number j from 1 to 9 are determined by the equalities (in millimeters)
B ₁ = 4.0; B ₂ = 4.0; B ₃ = 1.3; B ₄ = 2.0; B ₅ = 2.5; B ₆ = 3.4; B ₇ = 2.6; B ₈ = 1.9; B ₉ = 1.1. (1)
and the distance H _j when j = 1-3 is determined by the formulas
H ₁ = 0, H ₂ = 3, H ₃ = 3.1 (2)
(in millimeters), and for j = 4-19 it is determined by the formula
H _j = k _j • D _y , (3)
where D _y is the nominal diameter of the pipeline, mm,
and the coefficients k _j are given by the following equalities:
k ₄ = 0.093; k ₅ = 0.169; k ₆ = 0.282; k ₇ = 0.493; k ₈ = 0.734; k ₉ = 0.975, (4)
for the case when the sampling hole is discrete and consists of a system of five holes, then their width B _j at a distance H _j from the generatrix of the pipeline located on the diametrically opposite side relative to the outlet of the sampling device is determined as follows:
parameters B _j and H _{j of the} first hole are set by numbers j = 1 - 7 (j = 1 corresponds to the beginning, and j = 7 corresponds to the end of the first hole), parameters B _j and H _{j of the} second hole are set by numbers j = 8-10 (j = 8 corresponds to the beginning, aj = 10 - to the end of the second hole), parameters B _j and H _{j of the} third hole are set by numbers j = 11-13 (j = 11 corresponds to the beginning, aj = 13 - to the end of the third hole), parameters B _j and H _j fourth hole defined numbers j = 14-16 (j = 14 corresponds to the top, aj = 16 - end of the fourth hole), the parameters B _j and H _j fifth hole defined numbers j = 17-19 (j = 17 corresponds to the top, j = 19 - end of the fifth opening), the width B _j (in millimeters) defined by a set of values depending on the number j = 1-19:
B ₁ = 4.0; B ₂ = 4.0; B ₃ = 1.2; B ₄ = 1.5; B ₅ = 1.9; B ₆ = 2.5; B ₇ = 3.3; B ₈ = 3.3; B ₉ = 3.2; B ₁₀ = 3.0; B ₁₁ = 2.9; B ₁₂ = 2.9; B ₁₃ = 2.8; B ₁₄ = 2.8; B ₁₅ 2.7; B ₁₆ = 2.6; B ₁₇ = 2.6; B ₁₈ = 2.4; B ₁₉ = 2,3,
a distance H _j when j = 1-3 is determined by the formulas
H ₁ = 0, H ₂ = 3, H ₃ = 3.1 (6)
(in millimeters), and for j = 4-19 it is determined by the formula
H _j = k _j • D _y , (7)
where the coefficients k _j are set by a set of values depending on the number j = 4-19 by the following equalities
k ₄ = 0.024; k ₅ = 0.064; k ₆ = 0.103, k ₇ = 0.156; k ₈ = 0.252; k ₉ = 320; k ₁₀ = 0.388; k ₁₁ = 0.461; k ₁₂ = 0.494; k ₁₃ = 0.527; k ₁₄ = 0.629; k ₁₅ = 0.668 ;, k ₁₆ = 0.707; k ₁₇ = 0.890; k ₁₈ = 0.908; k ₁₉ = 0.925, (8)
the width of the sampling hole between the points determined using equalities (1) - (8) is a monotonic function of distance, the inner diameter d _{1 of the} sampling tube is chosen at least

where G = 9 mm, D _yo = 100 mm; permissible deviation of the hole width from the calculated one - not more than 0.2 mm, distance H _j - not more than 10 mm; the radius of curvature of the pointed sections of the sampling hole is from 0 to 5 mm; a stabilizer is installed at the lower end of the sampling tube, which changes the cross section of the sampling tube so that in the cross section of the pipe the stabilizer width X _n at a distance Y _n from the lower boundary of the sampling hole is determined by the formula
X _n = d ₁ - 0.2 - (d ₁ - 1.2) • (0.1 • (n-1)) ^0.5 , (9)
a Y _n is defined by the equalities
Y _n = 12.2 • (n-1), (10)
if the nominal diameter of the pipeline D _{y is} greater than or equal to 350 mm;
Y _n = 0,0348571 • (n-1) • D ^y , (11)
if D _y <350 mm;
the number n varies from 1 to 11, while the deviation of the parameters X _n and Y _n from the calculated is not more than 5 mm.

The most successfully posed problem (increasing the reliability of obtaining a representative sample while reducing the influence of factors contributing to clogging of the sampling hole, increasing the convenience in the manufacture and operation of sampling devices) is solved by choosing the design of the sampling device - in the form of a sampling tube with a thin wall on the side surface from the sampling hole. When performing a sampling hole on a thin-walled portion of the sampling tube, a large pressure drop across the sampling hole occurs. As a result, the dispersion of particles of the flow and their removal from the perimeter of the sampling hole occurs - so, it was experimentally established that when the wall thickness of the sampling tube from the side of the sampling hole is no more than 5 mm, the sampling hole around the perimeter remained clean for 3 months of operation, then as for the same period of time the patency of the sampling element of the prototype device [2] decreased by 60% due to siltation of the holes, while the quality of the sample deteriorated. The cavity of the sampling tube of the inventive device also remained clean - placement of a stabilizer with the indicated stabilizer parameters in the lower part of the sampling tube, - stabilizer width X _n depending on the distance Y _n from the edge of the sampling hole, (formulas (9) - (11)) - helps to increase the speed of the sample moved along the sampling tube and, together with this, the removal of heavy flow inclusions from the bottom of the tube. The high quality of the sample from the inventive device is ensured due to the fact that with the indicated selection of the parameters of the sampling hole, that is, the width B _{j of the} sampling hole, depending on the distance H _j from the generatrix of the pipe located on the diametrically opposite side of the sampling outlet in accordance with the equalities (1) - (8), a sampling takes place in accordance with the flow rate and the inclusions contained therein. Maintaining a high representativeness of the sample while changing the angle of inclination of the pipeline to the horizon has an indirect theoretical justification (confirmed by experiments, the data of which are given below): the stratification of the pipeline flow decreases with increasing angle of inclination of the pipeline to the horizon.

 The condition for making a sampling hole, when its width between the points determined by equalities (1) - (8), is a monotonic function of distance, provides a smooth change in the sampling hole and is convenient when it is made.

(G = 9 мм, D_y - условный диаметр трубопровода 2, D_yo=100 мм), необходимо для распределения давления в объеме пробозаборной трубки 1, достаточного для обеспечения процесса диспергирования включений потока и выноса их с периметра пробозаборного отверстия 7 при изокинетическом отборе пробы.A feature of the claimed device: the wall thickness from the side of the sampling hole does not increase in the direction of its placement in the pipeline, while limiting the wall thickness only from the side of the sampling hole, it makes it possible to choose a sampling tube with a wall thickness that provides the necessary fracture strength to which it is exposed due to the flow of the pipeline. In this case, the condition that the inner diameter d ₁ sampling tube was greater

(G = 9 mm, D _y is the nominal diameter of the pipe 2, D _yo = 100 mm), it is necessary to distribute the pressure in the volume of the sampling tube 1, sufficient to ensure the process of dispersion of the flow inclusions and their removal from the perimeter of the sampling hole 7 during isokinetic sampling .

 Thus, the advantage of the claimed device in comparison with the device prototype [2] is provided due to its advantage according to the specified individual characteristics.

 The inventive device for sampling liquid from a pipeline can be specifically used in oil fields - at oil metering stations, in oil refineries - in the analysis of the quality of oil products.

 In FIG. 1-2 presents a variant of the inventive device for sampling liquid from a pipeline with a continuous sampling hole: in FIG. 1 is a view in longitudinal section of a pipeline, in FIG. 2 - in the transverse. In FIG. 3 presents a variant of the inventive device for sampling liquid from a pipeline with a discrete sampling hole in the cross section of the pipeline.

 The device includes a sampling element, a sampling tube 1 mounted on top along the diameter of the pipe 2, elements for installing a sampling pipe 1 on the pipe 2: a mounting pipe 3, a cover 4 located on top of the pipe 2, and a nozzle 5 for sampling, a stabilizer 6 (Fig. 1.4). On the sampling tube 1, a sampling hole 7 is made, directed towards the flow (in Fig. 1, 2, the hole 7 is continuous; in Fig. 3, the hole 7 is discrete). In the lower part, the sampling hole 7 has an extension 8.

 The sampling tube 1 on the side of the hole 7 is characterized by a limited wall thickness: the average wall thickness on the side of the execution of the sampling holes does not increase in the direction of placement of the sampling tube and does not exceed 5 mm.

The parameters of the hole 7, - the width B _{j of the} hole 7 at a distance H _j (height) from the lower generatrix of the pipeline 2 (it coincides with the point O), - are defined as follows: -
for a continuous hole 7 (Fig. 2), the width B _{j of the} hole 7 is determined by the number j = 1-9 from formulas (1); the distance H _j from the lower generatrix О of the pipeline 2, on which the continuous hole 7 (Fig. 2) has a width B _j , is determined using formulas (2) - (4) depending on the number j = 1-9;
- for discrete hole 7 (Fig. 3), which is a system of holes 9-13, the parameter B _{j of} hole 9 is determined by number j = 1-7 from formulas (5) (j = 1 corresponds to the beginning, aj = 7 - to the end of the hole nine); the parameter B _{j of the} hole 10 is determined by the number j = 8-10 from formulas (5) (j = 8 corresponds to the beginning, aj = 10 corresponds to the end of the hole 10); the parameter B _{j of the} hole 11 is determined by the number j = 11-13 from the formulas (5) (j = 11 corresponds to the beginning, aj = 13 corresponds to the end of the hole 11); the parameter B _{j of the} hole 12 is determined by the number j = 14-16 from the formulas (5) (j = 14 corresponds to the beginning, and j = 16 corresponds to the end of the hole 12); the parameter B _{j of the} hole 13 is determined by the number j = 17-19 from the formulas (5) (j = 17 corresponds to the beginning, j = 19 - to the end of the hole 13); the distance H _j from the lower generatrix О of the pipeline 2, on which the discrete hole 7 (Fig. 3, which is a system of holes 9-13) has a width B _j , is determined using formulas (6) - (8) depending on the number j = 1-19;
- the extension 8 of the hole 7 (Fig.2-3) is made taking into account the hydraulic resistance of the sampling tube 1 and the stabilizer 6.

The stabilizer 6, FIG. 1, 4, has coordinates (X _n , Y _n ) determined according to formulas (9), (10) with a conditional diameter D _{y of} pipe 2 greater than or equal to 350 mm; and according to formulas (9) to (11) with a conditional diameter D _{y of} pipe 2 less than 350 mm.

 The sampling device (Fig. 1) is intended for sampling through the hole 7 from the flow of the pipeline 2 in accordance with the flow rate and the inclusions contained therein.

(G = 9 мм, D_y - условный диаметр трубопровода 2, D_yo = 100 мм), необходимо для распределения давления в объеме пробозаборной трубки 1, достаточного для обеспечения процесса диспергирования включений потока и выноса их с периметра пробозаборного отверстия 7 при изокинетическом отборе пробы.To ensure a sharp pressure drop at the sampling hole 7 (in Fig. 2, the sampling hole 7 is one continuous hole; in Fig. 3, the sampling hole 7 is a discrete one and represents a system of holes 9-13), which would be accompanied by dispersion of inclusions of the sample taken and the removal of them from the perimeter of the hole 7, as well as the lower part of the sampling tube 1, the sampling tube 1 on the execution side of the sampling hole 7 has a thin wall - not more than 5 mm, and in the lower part of the sampling tube 1 stabilizer 6 was installed - it was experimentally established that with an average wall thickness of not more than 5 mm of silt deposits around the perimeter of sampling hole 7 (continuous Fig. 2 and discrete Fig. 3) was not observed after a time interval (of the order of three months), at which the prototype sampling [ 2] to be cleaned - the sampling openings of the prototype device [2] were silted by 60 percent). In this case, the condition that the inner diameter d ₁ sampling tube 1 was greater

(G = 9 mm, D _y is the nominal diameter of the pipe 2, D _yo = 100 mm), it is necessary to distribute the pressure in the volume of the sampling tube 1, sufficient to ensure the process of dispersion of the flow inclusions and their removal from the perimeter of the sampling hole 7 during isokinetic sampling .

 The limitation of the average wall thickness of the sampling tube 1 by the condition of thin-walled (not more than 5 mm) only of the area where the sampling hole 7 (discrete in Fig. 2 and continuous in Fig. 3) is performed, also allows you to choose a sampling tube 1 with a wall thickness that provides the necessary strength against fracture under the influence of the flow of the pipeline 2 running on the tube 1.

 Sampling device, FIG. 13, operates as follows.

 Part of the fluid transported through the pipeline 2, under excess pressure, enters through a hole 7 opposite the flow into the sampling tube 1 from the pipeline flow in accordance with the flow rate and inclusions contained therein - for which the hole 7 for the continuous case (Fig. 2) is determined according to formulas (1) - (4), and for the discrete case (Fig. 3) is determined according to formulas (5) - (8); the parameters of the stabilizer 6 are calculated in accordance with formulas (9) - (11). With this sampling through a continuous (Fig. 2) or discrete (Fig. 3) hole 7, a high correspondence of the content of inclusions in the sample and the flow of the pipe 2 is ensured.

(G = 9 мм, D_y условный диаметр трубопровода 2, D_yo 100 мм), включения отбираемой пробы диспергируют и выносятся с периметра отверстия 7, - экспериментально установлено, что при толщине стенки со стороны отверстия 7 не более 5 мм уменьшается влияние факторов, под воздействием которых происходит заилевание пробозаборных отверстий (после трехмесячного периода эксплуатации заявляемого устройства оно характеризовалось 100% проходимостью непрерывного, фиг. 2 и дискретного, фиг. 3, пробозаборного отверстия 7, тогда как пробозаборник прототип [2] подлежал очистке пробозаборные отверстия устройства прототипа [2] были заилены на 60 процентов). Таким образом происходит самоочищение непрерывного (фиг. 2) и дискретного (фиг.3) отверстия 7. При этом, в виду того, что в нижней части пробозаборной трубки 1, где установлен стабилизатор 6, скорость отбираемой пробы вдоль пробозаборной трубки 1 характеризуется большим значением в виду того, что диаметр пробозаборной трубки 1 уменьшается в сторону нижней образующей О трубопровода 2. В результате вдоль пробозаборной трубки 1 обеспечивается движение пробы, которое исключает ее расслоение в объеме пробозаборной трубки 1 и изменение ее качества. Отобранная устройством проба, далее, через штуцер отбора 5 направляется на анализ (окончательное определение содержащихся в пробе включений).When sampling through a continuous or discrete sampling hole 7 of FIG. 2-3 there is a sharp pressure drop in view of the fact that the sampling tube 1 from the side of the hole 7 is thin-walled, and the inner diameter d _{1 of the} sampling tube 1 satisfies the condition

(G = 9 mm, D _y nominal diameter of the pipe 2, D _yo 100 mm), inclusions of the sample taken are dispersed and carried out from the perimeter of the hole 7, it was experimentally established that when the wall thickness from the side of the hole 7 is not more than 5 mm, the influence of factors decreases under the influence of which silting of the sampling holes occurs (after a three-month period of operation of the inventive device, it was characterized by 100% passability of the continuous, Fig. 2 and discrete, Fig. 3, sampling hole 7, while the prototype sampler [2] was subject to the source sample holes of the prototype device [2] were silted by 60 percent). In this way, self-cleaning of the continuous (Fig. 2) and discrete (Fig. 3) holes 7 occurs. Moreover, since in the lower part of the sampling tube 1, where the stabilizer 6 is installed, the speed of the sample taken along the sampling tube 1 is characterized by a large value in view of the fact that the diameter of the sampling tube 1 decreases towards the lower generatrix О of the pipeline 2. As a result, the movement of the sample is ensured along the sampling tube 1, which excludes its separation in the volume of the sampling tube 1 and a change in its quality. The sample taken by the device, then, through the sampling nozzle 5 is sent for analysis (final determination of the inclusions contained in the sample).

For pilot tests were made samples of the inventive device with a continuous (Fig. 2) and discrete (Fig. 3) embodiment of the hole 7. The inner diameter of the tube 1 of the samples installed on the pipe 2 with a nominal diameter of D _y 200 mm was 13 mm , samples installed on the pipeline 2 with a nominal diameter of D _y 500 mm, 21 mm, and samples installed on a pipeline with a nominal diameter of D _y 1200 mm, 32 mm; the average wall thickness of the tube 1 from the side of the holes was 5 mm, while the average wall thickness of the sampling tube 1 was 6 mm; on the pipeline 2 with a nominal diameter of D _y 200 mm, the samples of the claimed device were installed on horizontal, inclined at 40 ^o and vertical sections of the pipeline 2; samples of the inventive device for a pipeline with a diameter of D _y 500 and 1200 mm were installed on a horizontal section of pipeline 2. The parameters of the sampling hole 7 are calculated according to formulas (1) - (8) and are summarized for the samples of FIG. 2 (continuous sampling hole 7) in table. 1, for the samples of FIG. 3 (discrete sampling hole 7, representing a system of holes 9-13) - in table. 2. The parameters of the stabilizer 6 (Fig. 1, 4) are calculated according to formulas (9) - (11) and are given in table. 3 (for a pipeline with a nominal diameter D _y = 200 mm, the calculation was performed according to formulas (9), (11), and for pipelines with a nominal diameter D _y = 500 and 1200 mm, the calculation was performed according to formulas (9), (10)).

In the experiments, the flow of pipeline 2 was an oil emulsion with a water content of 12 to 88 wt.%; the temperature of the stream was 25 ^o C; the viscosity of anhydrous oil at 20 ^o C was 4 cP, the flow rate was 1 m / s, the sampling rate was established isokinetic.

 Comparative tests of the inventive device for sampling liquid from the pipeline were carried out using the device according to GOST 2517-85 [2] (prototype). Test data are summarized in tables 4-6.

(G=9 мм, D_y - условный диаметр трубопровода 2, D_yo = 100 мм) пробозаборное отверстие 7 (как в непрерывном варианте исполнения, фиг. 2, так и в дискретном, фиг. 3) по периметру оставалось чистым, проходимость же пробозаборных отверстий устройства прототипа [2] уменьшилась на 60% вследствие заиливания отверстий, при одновременном ухудшении качества пробы (по сравнению с данными, представленными в табл. 4-6 для устройства [2], качество пробы снизилось в среднем на 15%). При этом выбор пробозаборной трубки 1 (фиг. 1), толщина которой вне участка выполнения пробозаборного отверстия 7 (непрерывного, фиг. 2, или дискретного, фиг. 3) больше, чем на участке выполнения этого отверстия, позволило обеспечить необходимую прочность против излома под воздействием напора набегающего на пробозаборную трубку 1 потока трубопровода 1 - средняя толщина стенки 6 мм пробозаборной трубки 1, размещенной в трубопроводе 2 с условным диаметром D_y 1200 мм (а тем более и для трубопроводов c D_y 200 и 500 мм) при существующих скоростях потока (порядка 1 - 5 м/с), обеспечивает необходимую прочность пробозаборной трубки 1.The operation of the compared sampling devices (samples of the claimed and prototype [2]) for three months showed that when the wall thickness of the sampling tube 1 from the side of the sampling hole is not more than 5 mm and with an inner diameter of the tube 1 greater than

(G = 9 mm, D _y is the nominal diameter of the pipe 2, D _yo = 100 mm) the sampling hole 7 (both in the continuous embodiment, Fig. 2, and in the discrete, Fig. 3) around the perimeter remained clean, passability the sampling openings of the prototype device [2] decreased by 60% due to siltation of the holes, while the quality of the sample deteriorated (compared to the data presented in Table 4-6 for the device [2], the quality of the sample decreased by an average of 15%). Moreover, the choice of the sampling tube 1 (Fig. 1), the thickness of which is larger than the portion of the sampling hole 7 (continuous, Fig. 2, or discrete, Fig. 3) than that of the hole, made it possible to provide the necessary anti-fracture strength under the pressure of the flow of pipe 1 running on the sampling pipe 1 — the average wall thickness of 6 mm of the sampling pipe 1, placed in pipe 2 with a nominal diameter of D _y 1200 mm (and even more so for pipelines with D _y 200 and 500 mm) at existing flow rates (order and 1 - 5 m / sec), provides the necessary strength of the sample probe tube 1.

 The data of comparative tests are also clearly (testify to the advantage of the claimed device in comparison with the prototype device [2] and in terms of the quality of the obtained sample in the entire water cut range of the pipeline 2 flow both on horizontal and inclined and vertical sections of the pipeline.

 Thus, the test data fully confirm the need for the use of technical solutions proposed in the inventive device.

 The inventive device for sampling liquid from a pipeline is industrially applicable through the use of known nodes and parts, and the manufacture of individual elements of the device does not cause technical difficulties.

 The use of the claimed device will allow for more accurate quantitative and qualitative accounting of the fluid pumped through the pipelines, to reduce losses during commercial operations, and will provide ease of use.

 The introduction of the claimed equipment in the oil industry in 1999-2000 is supposed.

Claims (1)

A device for sampling fluid from a pipeline, including a sampling element installed in the pipeline with a sampling hole (continuous, discrete) facing the flow, a sampling device outlet located on top of a horizontal, inclined section of the pipeline, characterized in that a tube with a sampling hole on the side surface, the average value of the wall thickness of which on the execution side of the sampling hole does not increase from point p placement in the pipeline of the sampling tube and does not exceed 5 mm, while the sampling hole is set using the width B _j at a distance H _j (dimension B _j and H _j in millimeters) from the generatrix of the pipeline located on the diametrically opposite side relative to the outlet of the sampling device, as follows: if the sampling hole is continuous, then the parameters B _j and H _j when changing the number j from 1 to 9 are determined by the equalities
B ₁ = 4.0; B ₂ = 4.0; B ₃ = 1.3; B ₄ = 2.0; B ₅ = 2.5; B ₆ = 3.4; B ₇ = 2.6; B ₈ = 1.9; B ₉ = 1.1; (1)
H ₁ = 0; H ₂ = 3; H ₃ = 3.1; (2)
H _j = k _j • D _y for j = 4 - 9, (3)
where D _y is the nominal diameter of the pipeline, mm;
the coefficients k _j are given by the following equalities:
k ₄ = 0.093; k ₅ = 0.169; k ₆ = 0.282; k ₇ = 0.493; k ₈ = 0.734; k ₉ = 0.975, (4)
for the case when the sampling hole is discrete and consists of a system of five holes, then their width B _j at a distance H _j is determined as follows:
parameters B _j and H _{j of the} first hole are set by numbers j = 1 - 7, where j = 1 corresponds to the beginning, and j = 7 - to the end of the first hole;
the parameters B _j and H _{j of the} second hole are set by numbers j = 8 - 10, where j = 8 correspond to the beginning and j = 10 to the end of the second hole;
parameters B _j and H _{j of the} third hole are set by numbers j = 11 - 13, where j = 11 corresponds to the beginning, and j = 13 - to the end of the third hole;
the parameters B _j and H _{j of the} fourth hole are set by numbers j = 14 - 16, where j = 14 corresponds to the beginning, and j = 16 - to the end of the fourth hole;
the parameters B _j and H _{j of the} fifth hole are set by numbers j = 17 - 19, where j = 17 corresponds to the beginning, and j = 19 - to the end of the fifth hole,
the width B _j is set when changing the number j from 1 to 19 by the equalities
B ₁ = 4.0; B ₂ = 4.0; B ₃ = 1.2; B ₄ = 1.5; B ₅ = 1.9; B ₆ = 2.5; B ₇ = 3.3; B ₈ = 3.3; B ₉ = 3.2; B ₁₀ = 3.0; B ₁₁ = 2.9; B ₁₂ = 2.9; B ₁₃ = 2.8; B ₁₄ = 2.8; B ₁₅ = 2.7; B ₁₆ = 2.6; B ₁₇ = 2.6; B ₁₈ = 2.4; B ₁₉ = 2,3, (5)
the distance H _j for j = 1 - 3 is determined by the formulas
H ₁ = 0; H ₂ = 3; H ₃ = 3.1, (6)
and for j = 4 - 19 - according to the formula
H _j = k _j • D _y , (7)
where the coefficients k _j are set by a set of values depending on the number j = 4 - 19 by the following equalities:
k ₄ = 0.024; k ₅ = 0.064; k ₆ = 0.103; k ₇ = 0.156; k ₈ = 0.252; k ₉ = 0.320; k ₁₀ = 0.388; k ₁₁ = 0.461; k ₁₂ = 0.494; k ₁₃ = 0.527; k ₁₄ = 0.629; k ₁₅ = 0.668; k ₁₆ = 0.707; k ₁₇ = 0.890; k ₁₈ = 0.908; k ₁₉ = 0.925; (eight)
the width of the sampling hole between the points determined using equalities (1) - (8) is a monotonic function of distance, the inner diameter d _{1 of the} sampling tube is chosen at least

where G = 9 mm, D _yo = 100 mm; the permissible deviation of the hole width from the calculated one is not more than 0.2 mm, the distance H _j is not more than 10 mm, the radius of curvature of the pointed sections of the sampling hole is 0-5 mm, a stabilizer is installed at the lower end of the sampling tube, the width of which X _n at a distance Y _n from the lower boundary of the sampling hole is determined by the formula
X _n = d ₁ - 0.2 - (d ₁ - 1.2) • (0.1 • (n - 1)) ^0.5 ,
and Y _n is determined by the formulas
Y _n = 12.2 • (n - 1),
if the nominal diameter of the pipeline D _{y is} greater than or equal to 350 mm;
Y _n = 0,0348571 • (n - 1) • D _y ,
if D _y <350 mm;
number n varies from 1 to 11, while the deviation of the parameters X _n , Y _n from the calculated ones is not more than 5 mm.

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