EP0092975B1 - Dispositif pour recevoir et mélanger des échantillons - Google Patents

Dispositif pour recevoir et mélanger des échantillons Download PDF

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Publication number
EP0092975B1
EP0092975B1 EP83302261A EP83302261A EP0092975B1 EP 0092975 B1 EP0092975 B1 EP 0092975B1 EP 83302261 A EP83302261 A EP 83302261A EP 83302261 A EP83302261 A EP 83302261A EP 0092975 B1 EP0092975 B1 EP 0092975B1
Authority
EP
European Patent Office
Prior art keywords
sample
chamber
pistons
sub
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83302261A
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German (de)
English (en)
Other versions
EP0092975A1 (fr
Inventor
Brian George Slater
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BP PLC
Original Assignee
BP PLC
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Filing date
Publication date
Application filed by BP PLC filed Critical BP PLC
Publication of EP0092975A1 publication Critical patent/EP0092975A1/fr
Application granted granted Critical
Publication of EP0092975B1 publication Critical patent/EP0092975B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/086—Withdrawing samples at the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/451—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by means for moving the materials to be mixed or the mixture
    • B01F25/4512—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by means for moving the materials to be mixed or the mixture with reciprocating pistons

Definitions

  • the present invention relates to a process for taking a sample of a liquid containing high vapour pressure components such as 'spiked' crude oils which are crude oils into which light hydrocarbons have been injected, or, live crude oil which is crude oil as extracted prior to degasification.
  • high vapour pressure components such as 'spiked' crude oils which are crude oils into which light hydrocarbons have been injected, or, live crude oil which is crude oil as extracted prior to degasification.
  • the bulk sample should preferably be maintained at all times above its inherent vapour pressure to avoid loss of volatile components which may lead to inaccurate analysis. In some cases pressures of about 13.5 bar must be maintained.
  • pressures of about 13.5 bar must be maintained.
  • During shipment and storage of the bulk sample there must be no leakage from its container since any leakage would result in the preferential loss of light or heavy components thus destroying the representative nature of the sample.
  • leaks are potentially dangerous.
  • materials such as live crude oil tend to stratify into inhomogeneous components and therefore it is necessary to ensure when taking aliquots of the sample for analysis that these samples are truly representative. To satisfy this requirement, the bulk sample must be thoroughly mixed and it is sometimes necessary to heat the sample to facilitate mixing.
  • Some systems have an external pumped loop and use a static mixer element. This suffers from the disadvantage of having an external dead space.
  • Another system has a self-contained, hand operated mixing baffle housed in a cylinder and which is smaller in its cross-section than the diameter of the cylinder and consequently does not wipe the cylinder walls to which some components of the sample may adhere. This construction uses several sliding seals and is prone to wear and leakage. Furthermore, it has a vulnerable projecting shaft.
  • FR-A-2 447 260 discloses an apparatus for mixing togetherthe components of plastic moulding compositions. The components are first mixed together by transferring the components through a central passage and then expelled by the concerted action of two pistons. There is no disclosure of taking a sample while continuing the mixing step, and this reference is not concerned with the problems of taking representative samples of liquids containing constituents with a high vapour pressure.
  • the process for taking a sample of a liquid containing high vapour pressure components comprises introducing a portion of the liquid into an enclosed cylindrical chamber provided with
  • the fixed, transverse baffle is preferably a block which may be integral with or removably mounted within the chamber. Where it is removably mounted, it is preferably inserted in position within the chamber and held in place by means of one or more spigots extending transversely from the walls of the chamber.
  • the spigot has an internal channel or channels to enable the sample to be injected into and withdrawn from said sub-chambers via the port or ports in the baffle.
  • the space behind each of the pistons away from the sub-chambers is connected to a means for applying pressure on each of the pistons. Pressure is applied preferably by means of a fluid introduced into the space through fluid inlets.
  • the fluid is preferably gas.
  • a gaseous cushion is provided behind each of the pistons.
  • the space behind each piston is also connected to a relief valve such that when the gas inlet is open on a pressurising stroke of one piston the respective relief valve is closed and when the piston is in its retracting stroke, the respective gas inlet is closed but the relief valve is open. In the chamber there is more than adequate ullage space to prevent excessive pressure build-up due to temperature changes.
  • spigots there are two diametrically opposed spigots, each with an internal channel, extending transversely from walls of the chamber, one acting as a sample inlet and the other as a sample outlet.
  • the spigots may either be integral with the walls of the chamber or may be inserted as a plug, which may be a screw-threaded unit, into holes machined in the walls of the chamber such that each spigot is adapted to receive the means for introducing a sample into and/or withdrawing a sample from either sub-chamber.
  • the centrally located baffle has two ports capable of allowing passage of sample from one sub-chamber to the other. These ports are preferably in open communication with the channels in the spigots thereby enabling a sample to be introduced into and withdrawn from the sub-chambers.
  • the sample inlet is preferably connected to a sample source through a conventional regulating valve such as a needle valve.
  • the sample is preferably withdrawn from the sub-chambers through the baffle ports by a septum and syringe arrangement well-known to those skilled in the art.
  • a septum and syringe arrangement enables the external dead space in the device to be substantially eliminated.
  • the sample inlet is connected to a sample source and the sample flows via the spigot channels and through the baffle ports into the sub-chambers. Gas pressure is then applied on one of the pistons to force the sample through the port into the opposing sub-chamber. The process is then reversed by applying gas pressure on the other piston thereby forcing the sample through the baffle ports into the first chamber. After a dozen or so traverses of the pistons, thorough mixing and homogenisation of the sample is achieved and a syringe is introduced through the septum in the outlet to withdraw the mixed sample. The sample withdrawn is then analysed.
  • a single entry into the chamber wall can serve both as an inlet and an outlet for samples by connecting appropriate valve, septum and syringe arrangements through said entry.
  • the ports in the baffle may be shaped in such a way that their surfaces are uneven, e.g. a screw-threaded type.
  • the unevenness of the surface enables turbulence to be created as the sample is forced through the ports thereby aiding mixing.
  • the internal surfaces of the sub-chambers are preferably coated or lined with a material which minimises adhesion of sample components to the walls thereof.
  • a hydrophobic material such as polytetrafluoroethylene (PTFE) to minimise the adhesion of the sample components such as water to the walls of the sub-chamber.
  • PTFE polytetrafluoroethylene
  • the pistons preferably carry monitors, suitably magnetic, by means of which their position can be determined by sensors or indicators located outside the chamber. If the monitors carried by the pistons are magnetic, the external sensors or indicators are suitably also magnetic. Input of sample into the inlet will cause the pistons to move away from the baffle thereby causing movement of the external magnetic indicator.
  • monitors suitably magnetic
  • the external sensors or indicators are suitably also magnetic. Input of sample into the inlet will cause the pistons to move away from the baffle thereby causing movement of the external magnetic indicator.
  • appropriate colours on the magnetic indicator e.g. one colour such as green for normal and another such as red for abnormal, overfilling of the sub-chamber will be immediately apparent.
  • An alternative arrangement to locate the piston position and thereby to monitor the degree of filling of the chamber is to measure the pressure of the fluid sealed in the spaces behind each of the pistons. Normally, these two pressures will always be the same and their value will indicate the extent of compression of the volume within the respective spaces.
  • Figure 1 represents a sectional view of the sample receiving and mixing device and Figure 2 shows an enlarged section of the sample outlet arrangement.
  • the device has a cylindrical chamber (1) provided with a centrally located fixed, transverse baffle (2) having ports (3) and (4) and being held in position by spigots (7) and (10).
  • Port (3) is connected to sample inlet (5) regulated by a needle valve (26) through channel (6) in the spigot (7) and port (4) is connected to sample outlet (8) via channel (9) in spigot (10).
  • Two pistons (11) and (12) are disposed one on each side of the baffle (2) defining therewith sub-chambers (13) and (14) respectively.
  • the pistons are provided with magnetic monitors (15) and movement of the piston is detected by an external magnetic ladder indicator (16) responsive to the impulses generated by the monitors (15).
  • the sample outlet (8) is closed by safety cap (25) and a sample of "live" crude oil is introduced into the sub-chambers by connecting the sample inlet (5) directly to the crude oil source.
  • the piston (12) Upon introducing the sample into the sub-chambers and by maintaining a differential pressure in the two pistons through the gas inlets, the piston (12) is caused to move away from the baffle (2).
  • the piston (12) reaches the end of its travel by abutting against the endof the chamber, the other piston (11) begins to move away from the baffle thereby indicating that the first sub-chamber (14) has received a full quota of the sample.
  • the sample inlet is then closed and increased gas pressure is applied on the piston (12) furthest from the baffle (2) causing the sample to flow into the opposing sub-chamber (13) through the baffle ports (3) and (4).
  • the applied pressure on the piston (12) is maintained until piston (11) has reached the end of its travel on the opposite side. Thereafter the applied pressure on the piston (12) is withdrawn and pressure applied on piston (11) thereby reversing the process and causing the sample to flow back into sub-chamber (14).
  • the process is repeated several times until thorough mixing and homogeneity is achieved.
  • the sample outlet (5) is opened by first removing the safety cap (25) and then introducing a syringe (not shown) through the septum (23) to withdraw an aliquot of the sample for analysis.
  • the advantage of this process is that the continuous movement of the pistons need not be stopped during the withdrawal of the sample thereby ensuring thorough mixing until the moment of sampling.
  • the design is such that there is no dynamic seal liable to allow leakage from the chamber and the sample, once trapped, cannot accidentally escape.
  • the sliding action of the piston also ensures that the cylindrical walls are scraped clean of any component of the mixture, especially oil/water mixture, which might otherwise not be removed by rapid fluid motion.
  • a sample of the inert gas can be analysed for hydrocarbon gases and an appropriate correction made. This would be an abnormal occurrence but serves to demonstrate the double security of the design.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

Claims (9)

1. Un processus visant à prélever un échantillon d'un liquide contenant des composants gazeux sous haute pression qui prévoit l'introduction d'une part du liquide dans un compartiment cylindrique clos (1) et muni
(a) d'une chicane transversale fixe (2) située sensiblement en son centre et présentant au moins un orifice (3, 4) capable de laisser passer le liquide d'un côté à l'autre,
(b) d'un piston (11, 12) disposé de chaque côté de la chicane de manière à former deux sous-compartiments étanches (13,14) de volume variable, lesdits pistons pouvant évoluer le long de l'axe du cylindre sous l'effet de la pression du liquide,
(c) de dispositifs (9, 23) reliés à l'orifice permettant d'y prélever un échantillon de liquide,

les pistons fonctionnant en tandem de manière à forcer le liquide d'un sous-compartiment au second au travers de l'orifice et d'ainsi procéder à un brassage, l'échantillon de liquide brassé étant prélevé de l'orifice alors que les pistons fonctionnent en tandem de façon à assurer le va-et-vient du liquide entre les sous-compartiments.
2. Un processus conformément à la revendication 1 selon lequel la chicane (2) est un bloc monté de manière escamotable dans le compartiment.
3. Un processus conformément à la revendication 2 selon lequel la chicane est mise en place dans le compartiment et maintenue en position par une ou plusieurs broches (7, 10) sortant transversalement des parois du compartiment.
4. Un processus conformément à toute revendication précédente selon lequel la broche comporte une ou plusieurs cannelures internes (6, 9) permettant d'introduire ou de retirer l'échantillon desdits sous-compartiments.
5. Un processes conformément à toute revendication précédente selon lequel la pression est appliquée sur chacun des pistons par du gaz introduit dans les admissions (19, 20) prévues dans un espace à l'arrière de chaque piston.
6. Un processus conformément à toute revendication précédente selon lequel chacun des espaces à l'arrière des pistons est également relié à une détendeur (21, 22).
7. Un processus conformément à toute revendication précédente selon lequel le système de prélèvement de l'échantillon des sous-compartiments au travers des orifices de la chicane comprend une cloison (23) au travers de laquelle une seringeue peut être introduite.
8. Un processus conformément à toute revendication précédente selon lequel les surfaces internes des sous-compartiments sont revêtues d'un produit hydrophobique.
9. Un processus conformément à toute revendication précédente selon lequel les pistons comportent des moniteurs (15) grâce auxquels leur position dans le compartiment peut être déterminée par des sondes situées à l'extérieur du compartiment.
EP83302261A 1982-04-27 1983-04-21 Dispositif pour recevoir et mélanger des échantillons Expired EP0092975B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8212184 1982-04-27
GB8212184 1982-04-27

Publications (2)

Publication Number Publication Date
EP0092975A1 EP0092975A1 (fr) 1983-11-02
EP0092975B1 true EP0092975B1 (fr) 1987-01-14

Family

ID=10530003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83302261A Expired EP0092975B1 (fr) 1982-04-27 1983-04-21 Dispositif pour recevoir et mélanger des échantillons

Country Status (6)

Country Link
EP (1) EP0092975B1 (fr)
JP (1) JPS593239A (fr)
DE (1) DE3369089D1 (fr)
DK (1) DK178383A (fr)
FI (1) FI831441L (fr)
NO (1) NO831468L (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62136286A (ja) * 1985-12-10 1987-06-19 Kaiyo Kogyo Kk 水中における薬剤混合方法および装置
CA2146090C (fr) * 1994-05-10 1998-11-24 Mark E. Mitchell Appareil et methode de preparation de produits dans un environnement sterile
NO309396B1 (no) 1999-03-30 2001-01-22 Norske Stats Oljeselskap Fremgangsmåte og system for testing av et borehull ved bruk av en bevegelig plugg
US7246664B2 (en) * 2001-09-19 2007-07-24 Baker Hughes Incorporated Dual piston, single phase sampling mechanism and procedure
CN103954698B (zh) * 2005-10-06 2017-01-18 Sgs瑞士通用公证行股份有限公司 利用气相色谱仪分析分离的汽相和液相的组成
MY168284A (en) 2010-07-19 2018-10-19 Sgs North America Inc Automated analysis of pressurized reservoir fluids
US8991233B2 (en) 2011-04-28 2015-03-31 Sgs North America Inc. Analysis of pressurized reservoir fluids
FR3046358B1 (fr) * 2016-01-05 2020-12-04 Ac&B Procede et dispositif pour le melange de composants pour la fabrication d'un produit personnalise
CN110271748B (zh) * 2019-06-24 2020-09-11 杨胜杰 一种海底沉积物多层保真储存取样设备
CN111347577B (zh) * 2020-03-23 2022-01-11 株洲市圣翰有色焊材有限公司 一种基于往复挤压原理的新材料混合装置
CN111781019A (zh) * 2020-07-03 2020-10-16 中国海洋石油集团有限公司 一种泵抽模块和流体取样方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2152452A1 (en) * 1971-09-10 1973-04-27 Merlin Gerin Resin mixer dispenser unit - using twin adjustable throw pistons for a controlled volume discharge
CH542699A (de) * 1972-02-18 1973-10-15 P Huerlimann Hans Vorrichtung zum Behandeln von Stoffen
FR2447260A1 (fr) * 1979-01-26 1980-08-22 Euro Linea Snc Di Colombo Et C Methode pour melanger au moins deux liquides et les envoyer dans un moule de mise en forme

Also Published As

Publication number Publication date
FI831441L (fi) 1983-10-28
DE3369089D1 (en) 1987-02-19
DK178383D0 (da) 1983-04-22
DK178383A (da) 1983-10-28
EP0092975A1 (fr) 1983-11-02
NO831468L (no) 1983-10-28
JPS593239A (ja) 1984-01-09
FI831441A0 (fi) 1983-04-27

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