Device for sampling of liquid from pipeline

FIELD: machine building.

SUBSTANCE: device includes sampling tube mounted in pipeline perpendicular to flow movement and provided with slot-like inlet from side of flow movement. Slots in inlet are made horizontally along the height of pipeline and are directed toward liquid flow. Depth of slots changes from small near pipeline walls to largest near pipeline axis. Opposite to inlet in sampling tube there made is a vertical slot.

EFFECT: increasing sample uniformity and improving accuracy of sample composition determination.

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The invention relates to the oil industry and can be used when sampling the fluid from the pipeline.

A device for sampling fluid from the pipeline, including sampling tube installed vertically on the pipe diameter. The axis of the openings of the tubes are parallel to the pipeline axis and directed towards the flow. The opposite ends of the tubes included in the mixing chamber, from which the collected sample is supplied in a quality unit. The diameters of the selected tube satisfy the relationship 13:10:6:10:13 (the Sampler. GOST 2517-85 (p, cert).

However, the known device has a low representativeness of samples to be taken.

A device for sampling fluid from a pipeline containing sampling tube mounted in the pipe perpendicular to the traffic flow and having an inlet slit-like shape with side flow, the profile of which is selected from the conditions of admission under excessive fluid pressure from the pipeline is proportional to the flow rate at each elementary horizontal section of pipe with the same aspect ratio and with an average velocity at the inlet to the sampling tube is equal to the average flow velocity in the pipe (USSR Author's certificate No. 1700424, CL G01N 1/10, 1991).

However, the known device, the sampling element has a higher metal content, and its hydraulic resistance is large enough. In the known device in the sampling tube installed stabilizer flow rate, however, such placement of the stabilizer reduces the flow cross-section sampling element and increases the hydraulic resistance. The result can be technically difficult to ensure isokinetic sampling (especially when a large flow rate of the pipeline). And high quality of the resulting sample may not always be guaranteed.

The closest to the proposed invention the technical essence is a device for sampling fluid from the pipeline, including sampling tube mounted in the pipe perpendicular to the traffic flow and having an inlet slit-like shape with side flow, the profile of which is selected from the conditions of admission under excessive fluid pressure from the pipeline is proportional to the flow rate at each elementary horizontal section of pipe with the same proportionality constant, with an average velocity at the inlet to the sampling tube is equal to the average flow velocity in the pipe, the diameter and length of the sampling tube is selected from a ratio of 1:(12-30) (Patent RF №2085893, publ. 27.07.1997 - prototype).

A disadvantage of the known device t is aetsa violation of the kinetics of the movement of the fluid flow in the pipeline, the accumulation of the oil phase in the device that distorts the composition of the sample and leads to inaccuracies in the determination of the sample composition.

In the proposed invention solves the problem of increasing the homogeneity of the sample and thereby increase the accuracy of determining the composition of the sample.

The task is solved in that the device for sampling fluid from the pipeline, including sampling tube mounted in the pipe perpendicular to the traffic flow and having an inlet slit-like shape with side flow, according to the invention in an entrance aperture slit-like shape of the slit is made horizontally along the entire height of the pipe and is directed towards the flow of the fluid, the depth of the cracks varies from small near the pipe walls to highest near the axis of the pipe, opposite the inlet to the sampling tube is made of a vertical slit.

The invention

The development efficiency of the reservoir, the profitability of the well operation, timely decisions on the treatment of bottom-hole formation zone wells, repair of wells, evaluate the effectiveness of new technologies directly associated with obtaining reliable information about the content of oil and water in production wells. The solution to the problem of continuously monitoring the amount of oil and water in productionwise still remains relevant despite the currently available technical solutions to this problem. Existing sampling devices slotted type is oriented towards the flow of the liquid. The disadvantages of these devices are incomplete coverage of the cross section of the liquid, the lack of end-to-end flow, which entails the deposition of oil on the device.

The main selection criteria quality of the sample wells is a sampling from the entire cross-section of the fluid flow in the pipeline in a homogeneous or mixed flow, without the kinetics of the movement, without accumulation of the oil phase in the sampling device. In the proposed device solves the problem of increasing the homogeneity of the sample and thereby increase the accuracy of determination of the sample composition. The problem is solved by the device represented in figure 1-4.

Device for sampling fluid from the pipeline includes a sampling tube 1 mounted in the pipe 2 perpendicular to the traffic flow 3 and having an inlet opening in a horizontal slots 4 from the flow path 3. Horizontal slit 4 is made horizontally along the entire height of the pipeline 2. The depth of horizontal slits 4 is changed from a small 5 near the bottom and top to highest point 6 near the axis of the pipe 2. Opposite horizontal slots 4 in the sampling tube 1 has a vertical slit 7.

Under the placement sampling tube 1 to drobopro the remote control 2 is welded to the sleeve 8 with the formation of a welded seam 9. On the clutch 8 screw sampling tube 1. Sampling tube 1 is equipped with scontrino contrarily 10 label 11. Mark 11 and a horizontal slit 4 is directed towards the flow of the production well 3. Sampling faucet 12 nevernot on the outlet fitting 13 sampling tube 1, which is in communication with the internal volume 14 of the sampling tube 1.

The device operates as follows.

Make installation of the device. Well stop. In the discharge pipe 2 wells in the installation location of the device cut out "window". Under a hole in the body of the pipe 2 are welded welded seam 9 of the sleeve 8. The clutch 8 is wrapped around a sampling tube 1. Sampling tube 1 is installed strictly according to the label 11) and the nut 10. Tag 11, and hence the horizontal slit 4, is directed towards the flow of the production well 3. On the outlet fitting 14 sampling tube 1 wrapped around the sampling valve 12. The well is put into operation, check the tightness of the weld areas 9 and sampling tube 1. The flow of well production 3 passes through the horizontal slit 4 and the vertical slit 7. When this occurs the transition from laminar flow to turbulent. Happen mixing layer flow, normalization of flow. Sampling of production wells 3 carry out the opening of the sampling valve 12 and the discharge of products of SLE is new well 3 in standard glassware (not shown). When opening the sampling valve 12 production wells 3 passes through the horizontal slit 4, the internal volume 14 of the sampling tube 1, the sampling valve 12 in standard glassware, and at the same time part of the flow passes through the vertical slit 7. Sampling during this exercise from all sections of the production flow bore 3, without affecting the kinetics of motion. After sampling the sampling valve 12 is closed.

In the proposed device is a high homogeneity of the sample and thereby increases the accuracy of determination of the sample composition. Due to the presence of horizontal and vertical slots remains the kinetics of flow of fluid in the pipeline, there is no accumulation of oil phase in the device.

The choice of the size of the device depends on the flow rate and is determined based on the possibility of creating a turbulent flow in the area of sampling, depending on the calculated flow area conditional on the pipe diameter and fluid volume.

Specific example

It is known that turbulent fluid flow is provided by the Reynolds number Re≥2320, which is determined by the formula:

Re=V*D/v

where V is the velocity of the fluid, m/s,

D - diameter of pipe, m,

v - kinematic viscosity, m2/s

V=QW/ S*86400,

where QWthe output prehodyaschest, m3/day,

S is a sectional area of the pipe, m2,

S=π*D2/4=0.785*D2

v=µW/PW,

where µW- dynamic viscosity, PA*s,

ρW- liquid density kg/m3.

The dynamic viscosity of the oil is known for each object of development in MPa*sec (PA*s*10-3). Unambiguous determination of fluid viscosity (µW) calculated no, all formulas are approximate and depend on the properties of oil, water and gas in wells. Therefore, in the calculations when determining the criteria for selecting the device and place the installation on the wellhead depending on the flow rate of the fluid viscosity µWaccepted ≈ 15*10-3PA*S.

The Reynolds number after conversion:

Re=V*D/ v=V*D*ρWW=4* QW* ρW/ π*D* µW*86400=QW* µW/D* µW*67824

Nominal diameter of the pipeline in the area of selection is determined by calculating the free flow area after you install the sampling tube: Dy=(√STr-SSPS+ SUSPS/0,785) mm or Dy=(√STr-ΔSSPS/0,785),

where STr- section of the pipe without sampling tube, mm2,

SSPS- the section of the sampling tube, overlapping the common section of the pipe, mm2,

SUSPS- section vertical slit sampling trunk is, output, mm2.

STr=π*DTr2/4=0.785*DTr2;

SSPS=h3*dNSPsor SSPS=DNR.Tr*dNSPs;

where h3- the height of the sampling tube ≈ DVNTRthe inner diameter of pipe, mm,

dNSPs- outer diameter pasabordo tube, mm,

SUSPS- LinIny,

where Lin- the height of the vertical gap, mm,

iny- the width of the vertical gap, mm

or Dy=(√0.785* DVTR2-DVTR*dNSPs+Lin*iny/0,785) mm

Criteria for the use of various devices for fluid extraction (slot probabilitv) depending on the flow rate of the well.

1. Slotted probsably - 100, place of installation, the manifold wellhead, the tubing diameter is 100 mm

Original data:

DTr=100 mm; d bSPS=24 mm; dUSPS=18 mm; LUSPS=93 mm;y=3 mm; sy=3 mm - step

horizontal cracks.

Dy=(√0,785*1002-100*24+93*3/0,785)=85 mm,

then Qimp=2320*0,085*15*67,824/1000=200 m3/day;

when µW=15*10-3PA*s ρW=1000 kg/m3.

2. Slotted probsably - 50, installation location, valves or manifold wellhead, the tubing diameter equal to 50 mm

a) DTr=50 mm; d bSPS=16 mm; dUSPS=10 mm; LUSPS=46 mm;y=2 mm; sy=2 is m - step horizontal slits.

Dy=(√0,785*502-50*16+46*2/0,785)=40 mm

Qimp=2320*0,04*15*67,824/1000=94 m3/day

b) d bSPS=22 mm; dUSPS=18 mm; LUSPS=25 mm;y=2 mm; sy=3 mm.

Dy=(√0,785*502-50*22+25*2/0,785)=34 mm

Qimp=80 m3/day

The method of calculating slits

Depending on the flow rate of the fluid, of water production, the pressure in the pipeline, the installation location of the gap probabilita selected outer and inner diameter of the sampling tube, the number of horizontal slits, their width and spacing between the slits, as well as the height and width of the vertical slit.

Square horizontal cracks are calculated from the condition of proportionality to the square of the fluid flow along the pipe section to the areas of the slits sampling tube respectively at the levels planned horizontal cracks (horizontal plane).

Is determined by the aspect ratio of the cross section of fluid flow in the pipeline and in the sampling tube relative to the center of the pipeline:

Ks=sabout SPS/ Sp=Losps*/ DOTR*=Losps/ DTr=π* rEXT. SPS/ DTr

where Dabout=DTr- internal diameter of pipe, mm

Losps- the length of a semicircle cracks on the inner radius relative to the

the centre of the pipeline, mm

rEXT. the PZ - the inner radius of the sampling tube, mm

in - plan slit width, and the imaginary width of the fluid flow at this level, mm.

1. Define the chord of the cross section of the pipeline located on the same horizontal plane with horizontal slots,

where xo=Do=DTrand, respectively, xifrom 1 to N slots.

2. Defines the length of the horizontal semicircular slots:

Li=ks*xi

3. In the manufacture of sampling tube in the mechanical workshops required for each horizontal slit to calculate the distance shown in figure 4:

- from the center of the sampling tube to cut slits hi

- from the outside radius of the sampling tube to cut the gap Δh,

and the chord of the horizontal slit andi,

determined by the formula:

hi=rUNDPs*sin{90-(Li*90/π*rUNDPs)}, mm

Δhi=rnarps-hi, mm.

aiai=2*(Δhi*(2*rinn-Δhi)),mm

4. The height of the ve is a vertical slit accepted within L vs~ 0,92-0,93 DTrand the width of the vertical gap should not be greater than the width of the horizontal slits.

The results of the calculations bring to the table, such as the gap probabilita -100 (see table 1).

Table No. 1
SP-100 DTr=100 mm
ddrug=24; dEIT=18; Ny=17;g=3;in=3; sg=3; Lvs=93
№ p/pno cracksChord tubes
xi
The length of the gap (level)
Li
hiΔhiaiNote
182678.23.86.9
2750146.45.612.6
3665184.77.315.2
4575213.58.516.5
5485242.29.817.4
6390251.510.517.7
7295260.811.217.8
8198270.411.6 17.9
901002801218
10198270.411.617.9
11295260.811.217.8
12390251.510.517.7
13485242.29.817.4
145 75213.58.516.5
15665184.77.315.2
16750146.45.612.6
1782678.23.86.9

Similarly performed calculations for other sizes of slit probabilitv.

When using the claimed device was detected exact match multiple measurements with data control samples collected during the stop of fluid flow in the pipeline and selection for analysis of the stopped fluid.

Application of the proposed device will solve the problem of increasing the homogeneity of the sample and thereby improve accuracy and determine the sample composition

Device for sampling fluid from the pipeline, including sampling tube mounted in the pipe perpendicular to the traffic flow and having an inlet slit-like shape with side flow path, characterized in that the inlet slit is made horizontally along the entire height of the pipe and is directed towards the flow of the fluid, the depth of the cracks varies from small near the pipe walls to highest near the axis of the pipe, opposite the inlet to the sampling tube is made of a vertical slit.



 

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