Device for determining the concentration of gas in liquid
(57) Abstract:The device is applicable to determine the concentration dissolved in the liquid gas by the method of degassing a liquid and measuring the selected gas chemical indicator. It contains a chamber with a piston, measuring pipette with a check valve, and a discharge gas tube, hermetically embedded in the piston and provided with a locking device, the indicator and the aspirator to create a vacuum. When closed, the shut-off device, the camera works as a sampler and, in the open position as the crystallizer liquid samples. Ensured the integrity of the process of sampling and further analysis by the supply device non-return valve, shut-off device and combining in one camera three elements: pump, metering capacity and degasser. Achieved by increasing the accuracy of determining the concentration of gas in liquid, simplifying the design of the device and facilitate its operation. 1 Il. The present invention relates to devices for measuring the concentration of gas in oil field fluids and can be used in finding, mining and processing of oil and water.A device for measuring the gas content of the drilling fluid, sadista is stationary and overall product with the help of which it is impossible to determine the concentration of gases in the fluid sample at a distance from each other.A device for selection of gas-liquid sample in the well and determining the content of dissolved gases containing a vacuum chamber with a scale and a system of valves (and.with. The USSR 1608456, CL G O1 N 7/10, 1990). The device is intended for use in wells and wells to determine the gas content in the fluid sample from the process vessels and piping.A device for measuring components of the gas-liquid mixture containing the injector, degassers and flow meters.with. The USSR 1612242, CL G O1 N 7/14, 1990). The device is installed on the pipeline stationary, is not portable and is not possible to determine the gas content in the fluid sample other oil production facilities and training.Closest to the proposed technical solution (prototype) is the analyzer of hydrogen sulfide in the liquid ALJ-1 (Technical description and operating instructions, Bashneft, 1995), containing a chamber for liquid and gas (desorber) with the piston, a measuring head with a pipette, bubbler head with a draining pipe, indicatorsa is Alenia and set it to zero on the measuring pipette, then the camera is placed 0,2-2,0 cm3the analyzed fluid and the measuring head is replaced by a bubble. Degassing of the liquid samples is provided by the vacuum in the chamber by operating the suction pump and the inflow of clean air. Selected gases with air to pass through the indicator tube which responds to the desired gas, in particular hydrogen sulfide. After complete degassing at the camera again wrapped the head with a pipette and measured the volume of the initial sample fluid. The gas concentration is determined by dividing the mass of trapped gas volume of the sample fluid.The gap in time between the location of the sample liquid into the camera and attach bubbler head leads to some loss of the desired gas and distortion of the end result, and the double change from one head to another increases the time of analysis. A third disadvantage of the prototype is the need to ensure and verify integrity camera connection with measuring and bubbler heads.To improve the accuracy of determining the gas content in the liquid while simplifying the structure of the device and facilitate its operation known device for determining the concentration of asuu gas tube, the indicator and the aspirator made so that the camera is calibrated by volume, measuring pipette equipped with check valve and simultaneously serves as the inlet gas tube, and a discharge gas tube is hermetically embedded in the piston and provided with a locking device.The proposed device is shown in the drawing, 1 is a camera for the content, measuring the volume, dilution and degassing liquids with gas, 2 - piston 3 - measuring pipette, 4 - valve, 5 - discharge gas tube, tightly integrated in the piston, 6 shut - off device 7 to display, 8 - aspirator.The device operates as follows.The piston 2 is directed to a camera in an extreme position by pipette, and the locking device 6 is closed. With a large estimated gas concentration in the liquid tested in the pipette 3 through the check valve 4 by the upward movement of the piston 2 enter the desired volume of liquid, fix it, and further movement of the piston dilute a sample of the inert gas to the solvent so that the total volume of liquid did not exceed half of the volume of the chamber. The piston 2 is taken off to the extreme position opposite to the pipette, and begin the process of degassing. To do this, to discharge gas tube 5 is attached indranie, admission to the chamber of clean air or inert gas, the selection of the desired gas from the liquid and the recording indicator 7.When small, the estimated gas concentration in the liquid in the chamber 2 through the pipette 3 type necessary for degassing process, the volume of the liquid under study, record this amount on the scale of the camera and make the degassing according to the described scheme.Due to the first significant difference is the placement beginning of the discharge gas tube in the piston and the supply shutoff device, the degassing chamber 2 has an additional function - when closed, the shut-off device, the camera plays the role of the sampler.The second significant difference is the combination in one product measuring pipette, and the inlet gas tube allows to exclude from the process of sampling and further analysis period of the depressurization chamber. The test of the claimed device for hydrogen sulfide-containing samples of oil and water from wells, tanks and pipelines NGDU "Chickmagnet" ANK Bashneft has shown that the implementation of this important differences increases the accuracy of determining the concentration of hydrogen sulfide by 5-10% in samples with a high content of this gas (200 mg/l and more).The third Cresnet determine the content of gas (hydrogen sulfide) in samples with little content, what is the possibility of selecting for analysis a small amount of fluid (in the prototype of 0.2-2.0 cm3- volume pipettes), and much more, as the volume of chamber 1 exceeds the volume of the pipette 3 dozens of times.Technical and economic efficiency of the proposed device is formed by the following points:
1) increases the accuracy of determining the concentration of solute in the liquid gas, which leads to an objective assessment of the situation and make the necessary decisions;
2) simplified design reduces the cost of manufacture and facilitates its operation. Device for determining the concentration of gas in a liquid, comprising a chamber for liquid and gas with the piston and measuring pipette, inlet and outlet gas tube, the indicator and the suction device, characterized in that the camera is calibrated by volume, measuring pipette equipped with check valve and simultaneously serves as the inlet gas tube, and a discharge gas tube is hermetically embedded in the piston and provided with a locking device.
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes measuring in given sequence of appropriate parameters with following calculation of determined characteristics on basis of certain relation. Device for determining characteristics for sublimation of liquid oil products contains sublimation retort with dimensions, allowing to place 5-15 ml of analyzed probe therein, device for heating retort in its lower portion with constant and adjusted heating intensiveness, two inertia-less temperature sensors providing for continuous measurement of true value of temperature of sample in steam couple, device for continuous pressure measurement in stem phase of sample during sublimation, which includes pressure sensor as well as capillary and receiving and signals processing sensors, sent by temperature sensors and pressure sensor.
EFFECT: simplified construction, higher speed of operation.
2 cl, 4 ex, 10 tbl, 5 dwg
SUBSTANCE: apparatus includes upper mold-half and lower metallic mold-half. Upper flask is filled with sand and it has cavity for pouring melt metal and heat-insulation ring. Lower mold-half has base, sleeve and heat insulation cylinder. Sample of sand is placed into said cylinder and it is fixed by means of net. There is cavity between net and lid; said cavity is communicated with atmosphere through opening of lid and duct in which sampler is mounted. Other opening of lid is communicated with carrier-gas source through gas flow rate pickup. Gases are generated in sample by action of temperature of cast metal and they are filtered into cavity between net and lid where said gases are mixed with carrier gas. Flow rate of carrier gas is registered by means of pickup calibrated according to flow rate of selected carrier gas. Formed gas mixture is directed to sampler and in atmosphere. Mass speed of toxic gas separation is calculated on base of flow rate of carrier gas and concentration of toxic gas contained in samples of gas mixture. It is possible to use samples of different diameter.
EFFECT: enhanced accuracy of determining parameters of gas separation out of poured casting mold.
2 cl, 2 dwg
SUBSTANCE: in through portion of pipe with choking of through portion cavitation flow lock mode is set, and in zone of low density value of critical pressure of cavitation and liquid flow are determined, which flow is used to determined liquid speed in pipe neck. Received critical pressure value of cavitation is aligned with pressure of saturated steam of pumped liquid, after that to specially built calculation graph dependencies of relative value of critical pressure of critical speed of flow in channel neck are applied in the moment of setting of lock mode with different concentration of cores target concentration of cores of cavitation of pumped liquid is determined.
EFFECT: higher efficiency.
FIELD: analytical methods.
SUBSTANCE: invention relates to automated determination of solution concentrations, in particular from measured boiling temperature, and can be used in natural gas fields and in underground gas holders on gas absorption drying installations, wherein aqueous solution of di- or triethylene glycol is used as absorbent. Concentration of aqueous glycol solution comprises measurement of boiling point and vapor phase pressure over boiling solution. Sought concentration is calculated from following relationships: (1) Cg=Mg*Xg*100/(Mg+Xg+Mw*(1-Xg)), where Xg=(10Zw(T)-P)/(10Zw(T)-10Zg(T); (2) Zw(T)=8.006-1691/(230+T); (3) Xg(T)=9.270-3035/(230+T) for diethylene glycol; (4) Xg(T)=8.54-2927.5/(230+T) for triethylene glycol; where Zw(T) is exponent value in determination of saturated water vapor pressure, Zg(T) is exponent value in determination of saturated glycol vapor pressure, Mw=18 kg/kmole (molecular mass of water), Mg is molecular mass of glycol, Mg=106 kg/kmole for diethylene glycol, Mg=150.17 kg/kmole for triethylene glycol, T is boiling temperature of glycol solution, °C, P is pressure of vapor phase over boiling solution, kg/cm2.
EFFECT: increased determination accuracy.
FIELD: measurement engineering.
SUBSTANCE: method and device can be used in systems for survey, transportation and preparation of oil. Continuous and simultaneous measurement of volumetric discharge Q1 and Q2 is performed in two points standing apart along flow travel in pipeline; the measurements are carried out by means of two flowmeters. Behind the first point Q1, the local hydrodynamic disturbance is generated in flow by means of expansion of cross-section of flow. Second measurement is carried out at expanded part of flow. Availability of gas is judged from excess in setting relatively current values Q1 and Q2, which value is specified in controller to which controller the both flowmeters are connected. Device for realization of the method is made in form of insertion n the pipeline.
EFFECT: improved reliability of measurement.
2 cl, 1 dwg
FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises heating, mixing, aerating and degassing of lubricant in the device for investigating the lubricants. The aerating of the lubricants is provided by their flowing through the opening of alternative cross-section where pressure drop is generated. The degassing is provided by the use of the degassing unit where, under the action of centrifugal forces, the dissolved gas is removed from the lubricant. The processes are controlled by video surveying of generation, change of sizes, shape, and concentration of gas bubbles in the lubricant as well as by readings of temperature and pressure gauges. The device comprises oil tank for temperature control with mechanical mixer, heater, and temperature gauge and pipeline with valve. The device is additionally provided with pump, throttling valve, and degassing unit. The safety valve, pump, and throttling valve are connected in series through pipeline sections. The pipeline sections provided with throttling valve and degassing unit are made of a heat-resistant transparent material and provided with temperature and pressure gauges and digital video cameras connected with the computer.
EFFECT: enhanced precision.
2 cl, 1 dwg
FIELD: analysis of content of solution.
SUBSTANCE: method and device can be used for determination of mutual solvability of fluid and compressed gas. Solution is fed from piezometer along pipeline to flask and throttling process id performed by means of special gadget to reach atmospheric pressure, at which pressure the compressed gas loses its solvability and extracts from solution while other components are left in liquid or hard phase. Throttling unit is mounted in front of entrance of flask intended for solution. Flask is made of elastic and vapor-penetrable material. Volume of extracted gas is carried out due to measurement of volume of thermostatic fluid in flask, forced out of thermostat provided with overflow un it used for supplying solution into flask. Masses of solution components, left in flask in liquid or solid phase, are measured during time of τ when components change to vapor phase due to passing through walls of flask into environment. Content of solution component is determined by building graph and selecting linear part on it, which part is described by relation of m2+3 - m/m2+3=β+α*τ, where m2+3 is initial mass of components mixture, left in liquid or solid phase; m is mass of component mixture of solution, which components are left in liquid or solid phase at moment time of τ; α is relative speed of transition to vapor phase, defined as tangent of angle of inclination φ of linear part to axis τ; β=m3/m2+3 is mass portion of more volatile component of solution, where m is mass of more volatile component, which is defined as part of straight line cut out of axis m2+3 - m/m2+3, when linear part of graph is extrapolated to it on base of dependence of m3=β*m2+3. Mass of volatile component m2 is found from relation of m2= m2+3- m3.
EFFECT: improved precision of measurement; improved truth of results.
2 cl, 1 tbl, 2 dwg
FIELD: analytical tool-making industry, in particular, analytical devices meant for detecting micro-concentrations of substances, possible use for detecting steams of explosives on documents, for example, passports, tickets, etc.
SUBSTANCE: device for controlling traces of explosives on documents contains heated desorber for mounting steam carrier, air pump and detector of analyzed steams of explosives, while desorber is made in form of document receiver, which consists of central chamber, wherein document being studied is positioned, and divided from it by air gaps by two side chambers with electric heaters mounted in them, while inputs of side chambers are connected to output of air pump, connected by input to atmosphere, and outputs of side chambers are connected through air gaps of central chamber to input of detector of analyzed steams.
EFFECT: accelerated detection of steams of explosives absorbed on documents while providing for safety of document.
1 cl, 3 dwg
FIELD: analyzing or investigating of materials.
SUBSTANCE: press comprises cylinder filled with the sample of oil to be investigated. The top base of the cylinder is provided with a charging opening connected to the pressure gage and inlet of the multi-position air-operated valve. The cylinder receives the floating piston with the sealing ring that separates the cylinder into the top and the bottom chambers. The piston movements inside the cylinder to determine the volume of oil is recorded by an ultrasonic pickup of linear movements. The piston is connected with the hollow rod that passes outside through the bottom base of the cylinder and is connected with the measuring rod and compensator through the T-pipe. The other end of the measuring rod is connected with the electronic pickup of linear movements. The bottom chamber of the cylinder is connected with the hydraulic pump controlled by the pulse block.
EFFECT: enhanced precision.
FIELD: electronic engineering, in particular, methods for manufacturing powerful electro-vacuum devices.
SUBSTANCE: method includes excitation of gases being analyzed due to impulse energetic influence on electrodes. Duration of impulse energetic influence is selected to be less than time of flight of any one of gases being analyzed towards manometer transformer, but more than minimal excitation time of any one of gases being analyzed. As manometer transformer, magnetic electro-discharge pump built into electro-vacuum device is used. In process of measurement, stepped curve of pump current growth is measured, number of steps k on the curve is determined. Using features of current growth, ascending series of all values tn is determined - for time which passed since the moment of impulse energetic influence up to the middle of growth front of n step, where n=1,...,k. On basis of this information, mass number is determined for gases which escape into the volume of electro-vacuum device, as well as alternation of their partial pressures.
EFFECT: simplified method for measuring partial pressures of gases in a powerful electro-vacuum device, possible examination of processes, occurring in its vacuum space.
2 cl, 2 dwg, 1 tbl