Cable downhole gas chromatograph and method of downhole gas chromatography
FIELD: oil and gas industry.
SUBSTANCE: gas chromatograph includes chamber for samples with piston position sensor, which is connected through sample valve to pipeline and through oil pump to reservoir for compensation of hydraulic oil pressure, electrical thermostat with temperature sensor and chromatograph tube located inside thermostat, which is in-series connected on one side through rotating sample injector, zeolite filter, the first return valve and isolating valve of chromatograph with connection line of sample valve and chamber for specimens, in-series connected on the other side to the second return valve, fraction detector, bottle with sample portion and the second pressure sensor. At that, rotating sample injector is in-series connected to pressure reducer, valve for transporting medium, bottle with compressed nitrogen and the first pressure sensor, bypass line with bypass valve is parallel connected to rotating sample injector, chromatograph tube and fraction detector, and circuit of electronic telemetry is connected to output of fraction detector. Method of downhole gas chromatography is proposed as well.
EFFECT: development of device allowing to perform gas chromatography for determining the type of well fluids in well in real time.
3 cl, 5 dwg
The invention relates to devices used in the oil and gas industry.
Gas chromatography is a well-known measurement method, based on the input of a small portion of the test gas in a continuous stream known neutral gas ("media" or "conveying medium"). Then the gases pass through the capillary tube. Due to the different mobility of individual gases that make up the sample, the sample is divided into several portions, each of which consists of a single gas. At the exit of the capillary tube these individual portions in the media can be identified in various ways. Thus, it can be determined the complete chemical composition of the sample. The advantage of the chromatographic method is that the detectors on the receiving end can be greatly simplified, while maintaining high resolution of the system as a whole.
In the oil and gas field gas chromatography is widely used for analysis of samples of the drilling fluid and allows to determine the concentration of H2S, CH4With2H6etc. in gases, mixed with the output flow of the drilling fluid. The media typically used helium or nitrogen.
When implementing this method, the technique used for extracting, sampling and downhole analysis of formation fluids can be dropped in the oil the th hole on the rope or on drill pipe. The tools are installed on the wall of the well bore, after which the wall creates a water seal. Then in the layer is set to the probe, thus creating a hydraulic connection with the investigated layer. Samples of reservoir fluids ranging from a few cubic centimeters to hundreds of liters, are extracted from the reservoir in the instrument for carrying on the surface and/or on-site analysis. In some cases the samples after on-site analysis result in the well. Methods of analysis of fluids include resistivity measurements, coloring fluids or light absorption, density of fluid (as a function of absorption of γ-radiation), gas concentration (by refraction/ reflection of gas bubbles in thin tubes), etc. in Addition, there are special measuring parameters of fluid: using sensors register the exact values of pressure and temperature for different flow regimes.
Development of the device, allowing the use of methods for downhole analysis using a gas chromatograph, is of particular interest. Till now, such a technical solution was not considered, since the chromatographic tube is very long, and a single analysis, which consists in the separation of the sample components of interest, requires a lot of time. In addition, for the sample oturai is a significant amount of gas. Therefore, the shortcoming of the downhole chromatograph are large size and weight, making it impractical and difficult to use under various conditions of the real situation.
Gas chromatography, in particular gas-liquid, examines the sample, which was previously transferred into the vapor phase and is fed into the head of the chromatographic column (Figure 1), where position 1 is designated carrier gas, 2 - valve, 3 - column, 4 - a device for sample introduction, 5 - thermostat 6 detector 7 to the Registrar. The sample is transported through the column by a flow of inert gaseous mobile phase. The column itself contains a liquid or solid stationary phase, which is marked on the wall with an inert solid material. Transporting the carrier gas must be chemically inert. Commonly used gases such as nitrogen, helium, argon and carbon dioxide. The choice of carrier gas often depends on the type of detector. Feeding a carrier gas also contains a molecular sieve to remove water and other impurities.
For optimal operation of the chromatograph, the sample should not be too large and must be entered in the column in the form of steam jams - slow input large samples leads to a blurring of the boundaries and the deterioration of resolution. The most common method of input sample is the method in which COI is the box is used microspec to enter the sample through a rubber gasket in the channel quick evaporator in the head of the column. Temperature channel for sample usually 50°C above the boiling point of the least volatile component of the sample. For Packed columns, the sample size is in the range from tenths of a microliter to 20 microlitres. For capillary columns requires much smaller samples, usually around 10-3microlitres.
Sampling well fluid produced from the mid-1960's. Known tester fluids developed by Schlumberger, called Repeat Formation Tester - RFT™, modular dynamic tester Modular Dynamic Tester (MDT 1992) and SRFT™ (1997). However, the tester fluids RFT made no analysis of fluids in the well, it was intended to deliver samples of reservoir fluids using two high-pressure cylinders with valves with remote control.
In the modular dynamic tester (MDT Figure 2), selected as a prototype, was first implemented the idea of analyzing the downhole fluid using Resistive cell device with four electrodes to measure the electrical resistance of fluids during their passage through the measuring pipe (Dcock, Journal of Petroleum Science and Engineering 11 (1994), p.123-135). This is the first time allowed to determine the most common type of fluid (e.g. oil or water) prior to delivery of the sample to the surface. Figure 3 shows the scheme of the modular DIN the economic tester MDT where pos.10 marked resistance/temperature cell, 11 - jointed pipeline, 12 - front Shoe, 13 - filter, 14 - packer 15 - valve filter, 16 - pistons probe 17 is a module for samples, 18 - gauge CQG, 19 - isolation valve, 20 - leveling valve, 21 - piping line 22 - preliminary test, 23 - strain gauge, 24 - rear telescopic pistons, 25 - throttle/sealing valve 26 to the sample chamber.
Determining the type of well fluids have been further developed by introducing a module optical analyzer fluids (OFA). This module is introduced in the pipeline and performs detection of the type of fluids in real time by passing an intense light beam through the fluid and analyzing the spectral characteristics of the transmitted light. Due to the different absorption of light by water and oil recorded spectrum indicates the content of water and oil, and also allows you to define various types of oil. The gas is analyzed by various sensors that detect gas bubbles in the reflected light. A typical entry signal when determining the type of well fluid is presented on Figure 4. The same principle of measurement used by Schlumberger in the analyzer fluids Live Fluid Analyzer (LFA), which is a further development of the optical method OFA and is available since 2002, and also in the module Baker-Atlas SampleView.
One is about the complexity of the design of the modular dynamic tester and its application for downhole use is not allowed to perform the downhole gas chromatography.
The purpose of the proposed development was to create a device that allows you to spend gas chromatography to determine the type of well fluids in the well in real time.
The proposed cable downhole gas chromatograph shown in Figure 5, where POS marked the pipeline, 31 - valve sampling pattern, a 32 - sample chamber, 33 - isolation valve chromatograph, 34, zeolite filter, 35 - pass valve 36 is liquid nitrogen, 37 - rotating injector sample, 38 - tube chromatograph, 39 detector fraction, 40 - reservoir for compensation of the hydraulic pressure oil, 41 - controlled oil pump, a 42 - position sensor piston 43 - return valve 44 is a pressure reducer, 45 - valve for the conveying medium, 46 - pressure sensor 47 - temperature sensor 48 is the portion of the sample, 49 - electric thermostat, 50 - loop electronic telemetry.
The pipeline connects to the main pipeline modules MDT, top and bottom, because:
- method of introducing chromatograph in the MDT by joining the General (main) pipeline so that the module could be used above and below the point of selection of the sample, allows flexible installation of the downhole tool;
method and device for performing gas chromatography of the common pipeline allows you to repeatedly perform the analysis of the underwater and the same incision in the borehole;
- the use OFA/LFA for the preparation of chromatographic analysis allows the analysis of reservoir fluids so that they were less contaminated mud and mud filtrate.
Cable downhole gas chromatograph consists of the following components that perform the following functions:
1. Valve sampling sample 31 connects the pipe 30 MDT with the sample chamber module chromatograph 32;
2. Sample chamber 32 in the chromatograph is used to select small portions of the pipeline 30 for subsequent analysis; the sample chamber is equipped with a position sensor of the piston 42 and the oil pump 41 that allows you to take a sample from the pipeline or place the sample in the pipeline;
3. Isolation valve chromatograph 33 and the check valve 43 allows to translate the sample in the sensor section of the tool and prevent the reverse flow of the sample;
4. Replaceable zeolite air filter 34 provides the purity of the sample;
5. Air line with by-pass valve 35 are used to remove unwanted fluids from the sensor section;
6. The compressed nitrogen 36 has a valve for the conveying medium 45 and the pressure reducer 44, which are necessary for the organization of the flow of the transporting medium (nitrogen);
7. Rotating the sample injector 37 allows the introduction of the sample fluid in the flow transport is yuusei environment;
8. Tube chromatograph 38, which are separated fractions of the sample; the tube is in electrical thermostat 49, which supports the required elevated temperature, controlled by temperature sensor 47;
9. The detector fraction 39, based on the absorption of light;
10. The cylinder portion of the sample 48 for collecting the residual fluid after the test; - return valve 43 on the detector prevents the reverse flow of the conveying medium;
11. Circuit electronic telemetry 50 is used to transfer data over cable system to collect measurements on the surface.
The device works as follows:
1. Module chromatograph is located together with the rod for the MDT so that sampling point sample reservoir and the LFA module was on the one hand, and the pumping module (MRPO) or other equipment sampling was located on the other side.
2. The tool is lowered to the desired depth of the well, and installed hydraulic contact with formation fluids.
3. Reservoir fluid pumps pump at this time is held in the MDT measurement of the resistance sensors, temperature and pressure readings are taken LFA. After reaching the required purity of the discharge cycle begins and ends with the chromatographic analysis.
4. Valve sampling sample in the module chrome is tograph opens and fluid from the pipeline is drained into the sample chamber.
5. Valve sampling sample closes and opens isolation valve chromatograph for submission of sample for analysis.
6. Instantly opens the bypass valve (shunt) to flush the content from previous samples or other undesirable fluids.
7. The valve for the conveying medium is opened to create a flow of the transporting medium.
8. Rotating the sample injector is opened for input sample fluid to be analyzed.
9. Valve chromatograph closes and opens the valve of the sampling pattern for supplying fluid from the chamber for samples in the pipeline. The oil pump is used to move the piston. The oil pump stops and the valve sampling is closed by a signal from the position sensor piston.
10. Then the sample is separated in a chromatographic tube and analyzed by the traditional detector for gas chromatography. The remains of the conveying medium and samples are brought in the washing section.
11. After completion of the analysis closes the valve for the conveying medium, and the tool is ready to repeat the test at a different depth of the well, starting from step 2, above.
Developed in the Institute of catalysis, Siberian branch of the Sciences of the Russian Academy of Sciences midget chromatographic tube given the opportunity to construct rebar, allowing to combine the method of gas chromatography with the requirements and conditions of the oil and gas industry.
The most important advantage of the claimed device is that the small size of the tubes significantly reduce the processing time of the sample, so that the analysis conducted using the claimed device can be completed in a few minutes instead of several hours, which allowed us to design a downhole gas analyzer based on the principle of chromatography.
Thus, gas chromatography was first used to determine the type of well fluids in the well in real time.
1. Cable downhole gas chromatograph, comprising a sample chamber with a position sensor piston connected through a valve sampling sample with tubing and connected through the oil pump with a reservoir for compensation of the hydraulic pressure oil, electric thermostat with temperature sensor located inside thermostat tube chromatograph, with one side connected in series across the rotating injector sample, zeolite filter, the first check valve and isolation valve chromatograph with a line connection valve sampling of the sample and the camera for samples, on the other hand sequentially connected to the second non-return valve, detector faction points is ω with a portion of the sample and the second pressure sensor, and rotating the sample injector is connected in series with the pressure reducer, the valve for the conveying medium, the compressed nitrogen and the first pressure sensor, air line with a bypass valve connected in parallel with the rotating injector sample tube chromatograph and detector fractions, and the electronic circuit telemetry connected to the output of the detector faction.
2. Method of downhole gas chromatography, which
downhole gas chromatograph is lowered to the desired depth of the well and installed hydraulic contact with formation fluids,
pump pump reservoir fluids,
complete the cycle of discharge,
open the valve of the sampling of the sample and collect the fluid from the pipeline into the sample chamber,
close the valve of the sampling of the sample and open the isolating valve chromatograph for submission of sample for analysis,
at the same time, opens the bypass valve to flush the content from previous samples or other undesirable fluids
open the valve for the conveying medium,
open rotary injector sample to enter the sample fluid to be analyzed
close the valve chromatograph and open the valve of the sampling pattern for supplying fluid from the chamber for samples in the pipeline
move the piston through the oil the first pump, stop the oil pump and close the valve of the sampling signal from the position sensor piston
analyze the detector, the sample separated in the chromatographic tube,
the remains of the conveying medium and the samples sent to the washing section,
after the analysis completes, close the valve for the conveying medium.
3. The method according to claim 2, characterized in that the cable downhole gas chromatograph equipped with a bar for modular dynamic tester (MW)so that sampling point reservoir of the sample and the analyzer module fluids (LFA) was on the one hand, and the pumping module (MRPO) or other equipment sampling was located on the other hand, during the discharge of fluids held in the MDT measurement of the resistance sensors, temperature and pressure readings are taken LFA, the cycle discharge ends after reaching the desired purity.
SUBSTANCE: device for chromatographic separation of substances contains three chromatographic columns connected to each other by crossover channels fitted with switching elements and extra channels fitted with switching elements which are connected to a source of the separated medium, eluent stream and system of receivers for collecting fractions. A controlled flow divider, one or more detectors and an analytical column are fitted at the output of the chromatographic separation system. Also in order to increase output and efficiency of the device for chromatographic separation of substances dissolved in supercritical fluids, the receivers for collecting fractions are fitted with level sensors and their outputs are further fitted with pilot-controlled valves which prevent diffusion of collected substances between receivers. The device also has a collector with a receiver and a flow regulator for the stream of fluids evaporated when pressure falls below the critical value. The device also has a high-pressure pump whose output is also connected to the flow regulator with pressure sensors at the input and output and a flow sensor, which guide part of the stream of formed fluids through the pilot-controlled valve into one or more spherical reactors which have an outer insulating layer and outer and inner heat chambers connected to heat or cold sources, temperature sensors, and the other part of the stream is directed to the analytical column and reactor. The reactor is connected through the pilot-controlled valve to the spherical collector of fluid solutions which is similar to the reactor whose output is connected to liquid batch collection device.
EFFECT: more accurate batching and increased output and efficiency of the disclosed device.
SUBSTANCE: method involves taking a sample, concentration of impurities, chromatographic analysis with separation of the concentrate on a capillary column and mass-selective detection while raising temperature from 35°C to 280°C, isolation of tridecane and 1-methylnaphthalene as reference compounds on the chromatogram, calculation of their concentration ratio in the sample and calculation of the time of contact between diesel fuel and water using the formula: x=0.42·y-1.8, where x is the time of contact between diesel fuel and water, h; y=Stridecane/Smethylnaphthalene; Stridecane and Smethylnaphthalene are area of peaks of tridecane and 1-methylnaphthalene on reconstructed chromatograms on selective ions with mass to charge ratio of 85 for tridecane and 145 for 1-methylnaphthalene, which correspond to concentrations of given compounds in the sample.
EFFECT: simple and reliable method with high information content.
1 ex, 1 tbl
FIELD: test equipment.
SUBSTANCE: proposed invention relates to gas chromatographic analysis and can be used in alcohol quality tests. Proposed method consists in that, additionally, water-spirit mix in the ratio of 60/40% by volume is prepared to a series of model samples based thereon to prepared by adding every component of analysed drink separately in said mix. Then model sample are analysed at the inlet assembly temperature of 180°C, 250°C and 310°C. Note that unknown substance detected in model sample is qualified as artifact formed in analysis, while is it is absent from model samples, check sample is prepared by combining the entire series of model samples to be analysed at aforesaid 180°C, 250°C and 310°C. Then mass spectra and chromatograms related therewith are analyzed and, if there is no revealed unknown substance in check sample, it is qualified as marker of nonfoods origin.
EFFECT: unambiguous identification of chemical compounds and fragments thereof as well as their origin, higher accuracy and faster identification.
4 tbl, 3 ex
SUBSTANCE: invention relates to chemistry and can be used in coke-chemical production when processing coke gas. The method involves using fractions of heavy crude pyridine bases which form during coal carbonisation as raw material, from which pyridine bases are extracted first and the obtained faction of crude quinoline bases is split into components. The fractions of crude quinoline bases are split into components through supercritical preparative chromatography, where the separated mixture is brought into contact with gas in supercritical state, which is simultaneously the mobile phase and adsorbent.
EFFECT: simpler, faster and more reliable separation.
SUBSTANCE: invention relates to a novel chemical compound - 4-(2-hydroxyethyloxy)-4'-cyanoazoxybenzene which can be used as a liquid crystal stationary phase for gas chromatography.
EFFECT: given compound has higher structural selectivity than structural isomers of lutidine.
1 ex, 1 tbl
SUBSTANCE: sample analysis device has a column for anion-exchange chromatography, as well as a buffer for elution, which contains an ion formed from a group consisting of a nitrate and a chloride. The device also includes an amperometric sensor and a spectroscopic sensor. The two sensors are placed such that, an eluate is obtained from the column.
EFFECT: provision for additional and improved methods of and systems for determining characteristics of saccharides using anion-exchange chromatography.
14 cl, 21 dwg
SUBSTANCE: method of determining content of diesel fuel in lubricating oil of an internal combustion engine involves the following stages: preparing a mixture which contains an oil sample and C5 hydrocarbon, such as C5 alkane; injecting the mixture into the injector (11) of gas chromatograph (10); obtaining chromatographs of the sample; determination of the firs parametre M, which characterises peak area related to C5 hydrocarbon, such as C5 alkane, determination the second parametre C, which characterises area of at least one peak, related to a hydrocarbon, which characterises diesel fuel; and determination of content T of diesel fuel using formula (I): where a and b are constants, which define equation y=ax+b of a calibrating straight line of the ratio of the second to the first parametres as a function of content of diesel fuel.
EFFECT: increased accuracy and reliability of analysis.
8 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to process engineering and can be used in deeper conversion of hydrocarbons, their cracking and reforming. Proposed device comprises three chromatographic columns, one for sorbent layer regeneration from the mix heavy fraction and the other two for mix separation and release of light fraction. Aforesaid columns are divided into sections, each filled with sorbent that moves forced by carrier gas. The latter is fed from the first section and withdrawn from the third section, via transition channels incorporating controlled switching elements. Each column communicates with the system of preparation of introduction of the mix to be separated and with fraction collectors. There is a sorption-desorption activator arranged in sample preparation and introduction line to destruct complex organic molecules and distill separated substance.
EFFECT: higher efficiency.
FIELD: physics, measurement.
SUBSTANCE: invention is related to chromatograph intended for analysis of gaseous substance. Device comprises supplying system for sample supply, open tubular capillary column for separation of sample components, device for temperature control for adjustment of column temperature, detector for detection of separated sample components. Specified column comprises bundle of open tubular capillaries. Besides specified capillaries have gas permeable walls that comprise polymer membrane.
EFFECT: improved chemical specificity of detector, improved strength of structure.
22 cl, 3 dwg
FIELD: physics, measurements.
SUBSTANCE: proposed method can be used in chemical, petrochemical, medical and other industries to analyse compound mixes of various substances. It differs from known techniques in that as chyral smectic decyloxi-benzylidenamino-2-methyl-butyl-ether of aminocinnamic acid vapor is used as a fixed nematic phase.
EFFECT: higher selectivity of analysis.
FIELD: gas-and-oil industry.
SUBSTANCE: device consists of flow line communicated with formation fluids. Also the flow line includes the first section containing the first conducting zone, the second section containing the second conducting zone and an isolating section located between the first and second sections and preventing direct electrical connection between the first and the second section. The first circular core and the second circular core surround the flow line around the first and the second sections correspondingly. Additionally, the first circular core induces electrical current in fluid in the flow line, while the second circular core is designed for measurement of electrical current induced in fluid in the flow line. The electron block is designed for control over the first and the second circular cores.
EFFECT: increased reliability of method and device for measurement of specific resistance in formation testers or similar downhole equipment.
16 cl, 14 dwg
SUBSTANCE: method and system for description of pyrobitumen gradients in reservoir bed of interest and analysis of properties of reservoir bed of interest on the basis of such pyrobitumen gradients. Analysis uses correlation, which connects concentration of insoluble pyrobitumen with data of spectrophotometric measurements, taken at depth.
EFFECT: invention provides for accurate determination of separation or uneven distribution of carbohydrate in reservoir bed of interest.
20 cl, 5 dwg
FIELD: measurement equipment.
SUBSTANCE: invention relates to analysis of the geological stratum fluids in the well for estimate and inspection of the stratum for the purposes of investigation and development of hydrocarbons production wells. The method and devices for analysis of stratum fluids in a well by way of separation (selection) of fluids from the stratum and/or borehole in the assembly for regulation of pressure and volume which is integrated into the flow line of the fluid analysis module and definition of isolated fluids characteristics. The required parametres may be deducted for stratum fluids in the static state and the undesirable stratum fluids may be drained and substituted with stratum fluids suitable for definition of characteristics or extraction of samples to the surface. The selected stratum fluids may be subject to circulation in the flow line circuit for definition of phase behaviour characteristics. Real time analysis of fluids may be performed under or almost under well conditions.
EFFECT: creation of method for analysis of stratum fluids in well by way of selection of fluids from the stratum and/or borehole into the analyser module flow line.
21 cl, 10 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: proposed device comprises test chamber, appliance to displace fluid, pressure device and at least one transducer. Test chamber makes a fluid receiving estimation chamber. Appliance to displace fluid comprises drive to act on fluid to make it displace inside said test chamber. Pressure device continuously varies fluid pressure.
EFFECT: accurate real-time analysis inside borehole.
27 cl, 8 dwg
FIELD: engines and pumps.
SUBSTANCE: method involves introduction of common flexible tubing string to the well bore with annular space formed around flexible tubing string; activation of the device for separation of zones for isolation at least of one well bore zone; direction of test fluid medium to well bore through flexible tubing string to location place above the aforesaid zone; removal of outlet fluid medium from isolated zone and test fluid medium from flexible tubing string through annular space; measurement of characteristic of flow rate and pressure of outlet fluid medium during discharge.
EFFECT: isolation and test of separate zones without removing operating tubing string.
20 cl, 15 dwg
FIELD: oil and gas industry.
SUBSTANCE: for this method, containing method of sample sampling of fluid in point of sampling, analysis of physical and chemical properties of fluid sample in sampling point, recordings of sample properties in point of sampling into archive of electronic data base, analysis of physical and chemical properties of sample of fluid in place remote from point of sampling, recording of sample properties in remote place into archive, checking of fluid sample fitness be means of comparison of properties in point of sampling and sample properties in remote place and recording of properties of checked for fitness of sample into archive.
EFFECT: providing of method of reliable and qualitative sample of fluid and improvement of data quality, controllability and conformity of data about fluids parametres.
32 cl, 4 dwg
FIELD: measuring equipment.
SUBSTANCE: invention is related to hydrodynamic research of oil and gas wells, and may be used to study physical properties of their layers. Device comprises implosion chamber, packer module, moisture gauge, resistivity metre, sampler, module of samplers, slide valve unit, additional pressure sensor arranged over packer module. Besides slide valve unit is equipped with valves and installed over module of samplers with the possibility to switch flow of samples over to implosion chamber arranged in upper part of device, and to module of samplers through sampler, which comprises differential pistons, and sampler and implosion chamber are connected to well bore zone via vertical channel, where moisture metre, resistivity metre, sensor of layer pressure and temperature sensor are installed.
EFFECT: improved accuracy of research of hydrodynamic characteristics of oil and gas wells and improved quality of formation fluid samples at various depth due to elimination of well fluid effect at results of samples analysis and taking.
3 cl, 3 dwg
FIELD: oil and gas production.
SUBSTANCE: invention is related to oil production industry and is intended to assess parametres of underground bed, having primary fluid and contaminated fluid. In order to produce fluids from bed, fluid is extracted into at least two inlet holes. At least one assessment diverting line is connected by fluid with at least one of inlet holes for movement of primary fluid into well instrument. At least one cleaning diverting line is connected by fluid with inlet holes for passage of contaminated fluid into well instrument. At least one circuit of fluid is connected by fluid with assessment diverting line and/or with cleaning diverting line for selective extraction of fluid in it. At least one hydraulic connector is used to selectively pull hydraulic pressure between connecting lines. At least one detector is used to measure well parametres in one of diverting lines. In order to reduce contamination, fluid might be selectively pumped along diverting lines into assessment diverting line.
EFFECT: provision of flexibility and selectivity to control fluid flow through well instrument by detection, reaction and removal of contamination.
23 cl, 30 dwg
FIELD: oil and gas production.
SUBSTANCE: invention is related to oil production industry and is intended for assessment of bed, through which well bore passes. For this purpose method, well tool and bed fluid medium sampling system are developed. Bed fluid medium is extracted from underground bed into well tool and is collected in sampler chamber. Diverting discharge line in working condition is connected to sampler chamber for selective removal of contaminated or clean part of bed fluid medium from sample chamber. As a result contamination is removed from sampler chamber. At the same time clean part of bed fluid medium may be let through another sampler chamber for collection or contaminated part of bed fluid medium may be dropped into well bore.
EFFECT: provision of possibility to remove contaminated fluid medium from well tool and extraction of cleaner fluid medium from underground bed.
38 cl, 8 dwg
FIELD: process engineering.
SUBSTANCE: proposed device is intended for fluid medium flowing in min pipe and containing at least selected phase and another phase, and comprises sampling device to sample specimen from fluid medium from multiphase mixture. Proposed device comprises sampling variable-volume chamber to allow gravity-forced disintegration of fluid medium into that enriched by selected phase and fluid medium enriched by at least another one phase. Device incorporates also valve-type manifold that communicates sampling device to sampling chamber to direct fluid medium into said chamber and enriched fluid medium back into main pipe. Proposed method consists of three stages. First stage comprises sampling multiphase fluid medium by connecting one probe to sampling chamber and increasing chamber inner volume to allow gravity-forced fluid medium specimen disintegration into that enriched with selected phase and at least one another fluid medium enriched with useless phase. Second phase comprises draining at least one fluid medium enriched with useless phase back into main pipe by connecting sampling chamber with one probe to reduce chamber inner volume. Then first and second stages are repeated to produce given amount of fluid medium enriched by selected phase in sampling chamber. Third stage consists in forcing aforesaid phase from sampling chamber, connecting the latter to outlet channel and reducing chamber inner volume.
EFFECT: improved operating performances.
16 cl, 2 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes picking a sample of bed fluid under pressure by means of pump. Sample of fluid is then compressed by moveable piston, actuated by hydrostatic pressure in well through valve. Compressed sample of bed fluid is contained under high pressure inside the chamber with fixed volume for delivery to well surface. Moveable piston is in form of inner and outer bushings, moveable relatively to each other. At the same time several tanks for picking samples from several areas may be lowered into well with minimal time delays. Tanks may be emptied on well surface by evacuation pressure, to constantly provide for keeping of pressure of fluid sample above previously selected pressure.
EFFECT: higher reliability.
6 cl, 14 dwg