Gas sampling system

FIELD: oil and gas industry.

SUBSTANCE: system contains casing-well, cylindrical sampler comprising three main parts, top part is manifold chamber, middle part is connecting coupling with female thread and groove connecting bottom and top parts, bottom part is receiving chamber for accumulation of gas supplied via side holes of the casing-well, receiving chamber and manifold chamber are covered with lids, above the connecting coupling a discharge tube is installed, under it a receiving tube is installed, above it a ball valve is installed, top discharge tube passes through the manifold chamber, lid and goes outside, on it the inlet union valve is installed to inject air in the manifold chamber and safety union valve for overpressure relief, the pneumatic chambers are located one above, and another below the inlet holes in the sampler casing, in top lid of the sampler the outlet valve is installed, casing pipe is made out of n pipes connected by outside thread coupling, with side holes of same diameter uniformly distributed along length of the casing pipe-well.

EFFECT: simplified design.

3 dwg

 

The invention relates to hydrogeochemical studies of wells, and is intended for selection of spontaneous and dissolved gas released in a variety of genetically different layers of peat with different fixed depth horizons of the peat deposits.

A device for sampling gas from wells hermetic dirt tube-wells (patent RU №2125158, IPC AV 49/02, from 20.01. 1999) includes a cylindrical body with a tail stabilizer. Built-in camera, insert the vibrator and the gas collection cylinder. For sealing the lower part of the housing has a device made in the form of hydro-pneumatic rubber valve connected to the cylinder low working pressure, filled with an inert gas-liquid mixture. A device for sealing the upper part of the tube is made in the form of a spring-loaded solenoid valve. The invention allows to make a quantitative assessment of natural or man-made gas saturation of the sediment and the water column due to the rise of the samples sealed in the receiving chamber.

The disadvantage of the device is the design complexity, the large number of technologically complex parts requiring high precision.

A device container-sampler (RU No. 2249693, IPC EV 49/08, from 10.04. 2005). The invention relates to the sampling of formation fluid and gas, comprising a housing in the form of a grooved cylinder with attached lids. Inside the case are the dividing piston and ball for mixing samples, hydrocortisone to slow the intake of the sample. A spool valve is used to secure the intake, sealing and unsealing of the selected fluid attached to the lid and consists of a stem with a TV and a sleeve with collar. The collar is clamped between the United threaded nuts, one of which is connected by a threaded stem. A needle valve is used to bleed pressure from the enclosed space above the spool valve before removing the container of the probe from the test equipment of layers.

The disadvantage of the device is the design complexity due to the presence of a large number of nodes and technically complex parts, which reduces the reliability of his work.

Known multi-chamber vacuum sampler (EN 2080580, IPC G01N 1/10, dated 27.05.1997), sampling of liquid and dissolved gas from wells and reservoirs. It contains a vacuum chamber, which are combined in a common housing in sections of about three chambers each. In the lower cover body mounted connectors, three of which are located at an angle of 120° for connection of vacuum chambers. The fourth switch�m is mounted on the center of the probe for connection with a piece of cable with cable lugs following sections of three vacuum chambers.

The disadvantage of the device is the design complexity, thereby reducing the reliability of the sampler.

Known depth samplers (V. S. Samarin. Hydrochemical sampling of groundwater, Publishing house of Leningrad University, 1958, p. 66-69).

Closest to the technical essence and the achieved result is a device for sampling water and gas to chemical analysis, consisting of a perforated casing-bore, telescopic sampler Simon and bottle Savchenko.

Telescopic sampler Simonova produce gas sampling with a predetermined depth from the vertical wells of the aquifer. The sampler consists of 3 cylindrical containers inserted one inside another, on the principle of a telescopic pipe. The inner and intermediate cylinders provided with plungers that when you change the pressure on them allow vessels to move. Along the axis of the inner cylinder is a pipe with three-way stopcock at the bottom. The outer cylinder is provided in the upper part of the wedge with the dogs holding the piston of the intermediate cylinder. In the tip of the probe has an outlet opening for discharging the gas.

The disadvantage of the device is the design complexity, the large number of technologically complex parts requiring high precision.

On�provided task create a system to ensure periodic sampling of gas from fixed depths, spaced along the height of the peat deposits.

Complex sample gas contains casing-bore, cylindrical sampler, consisting of three main parts. The upper part of the sampler - camera-collector. Intermediate - coupling with internal thread and a groove connecting the lower and upper parts of the probe. The lower part of the camera receiver for the accumulation in it of gas flowing through the side openings of the casing-bore. Camera receiver and collector closed lids.

On top of the coupling is located in the discharge tube, bottom - reception tube, over which is placed a ball valve.

The upper discharge tube passes through the chamber-reservoir, cap and leads out. It contains an inlet nipple-valve for injecting air into the manifold and pressure relief valve-a valve for relieving excess air pressure. Pneumatic chambers arranged one above and one below the receiving holes in the housing of the probe. In the top cover of the sampler installed the exhaust valve. The casing pipe is made of n-th number of tubes interconnected outer threaded couplings into one, with the side holes of the same diameter�, evenly spaced along the length of the casing-bore.

The complex contains the well casing-well 25 and the sampler (Fig.2). Casing-borehole consists of 25 separate tubes connected by an exterior threaded couplings.

Fig.1 illustrates a system for sampling gas in longitudinal section.

Fig.2 shows the sampler in the context.

Fig.3 shows the sampler.

Complex for water sampling consists of casing-bore and cylindrical sampler.

The sampler (Fig.2) contains three main parts. The upper part of the camera-the collector 1 is intended for distribution generated in the air pressure in the pneumatic chamber 2. Between camera collector 1 and camera module 3 is located coupling 4. Camera-receiver 3 - for accumulation of gas entering through the side openings 5.

Camera-the collector 1 is closed by the cover 6, and the camera-receiver - cover 7. Lid sealed with a rubber seal ring 8.

In the middle of the coupling 4 is made a groove for the sealing ring 9 to provide a hermetic seal.

In the coupling of 4 with an internal thread screwed on top - discharge 10, bottom - receiving tube 11. Between them is a ball-valve 12, air pressure creates the tightness pressing against the seat of the receiving tube 13. Upper blower tube 10 passes through the camera-the collector 1 and the cover 6.

At the top of the discharge tube 10 has an inlet nipple-valve 14 for circulating the air in the collector 1, coming through the holes 15 of the sampler and safety valve-a valve 16 on the outside of the probe (Fig.2) for relieving excess air pressure in the pneumatic chambers 2, adjusting pressure in them.

Pneumatic chamber 2 are located one above and the other below the receiving holes 5 in the housing of the sampler (Fig.2) and are connected by a pipe 17 connecting receiving apertures 15.

Pneumatic chamber 2 perform the task lock the sampler in the well and block the flow of gas from above and below uniformly spaced side holes 26 along the length of the casing-bore 25.

The exhaust valve 18, the rod 19 which passes through the cover 6 of the probe and under the action of the spring 20 presses the exhaust valve 18 to the valve seat 21.

The spring 20 is fixed on the stem nut 22. On top of the exhaust valve 18 is made the ring 23, to lift the sampler. The discharge tube 10 is fixed on the upper cover 6 nut 24.

Casing-borehole 25 is interconnected outer threaded couplings one-N - the number of pipes. Along the length of the pipe evenly located�ageny side openings 26 with the same diameter, through which gas flows into the well. The lower part of the pipe (first) equipped with a cone - tipped 27, facilitating its entry into the soil. Pipe-bore 25 receives input through the side openings 26 gas. Optimal conditions for research the diameter of the side holes 26 is determined empirically. Interval spaced along the length of the lateral pipe openings 26 define the size of the sampler (Fig.2), as well as a comparison with existing methods.

Sample gas as it accumulates in the chamber-the receiver 3 through the receiving tube 11 and an upper discharge tube 10 and the silicon armirovannogo hose 28 are lifted to the surface with subsequent transportation.

The operation of the system for the selection of gas ranges available based on the allocated receipt peat Deposit gas into the well through the side openings 26 in the wall of the casing-bore and transporting it to the surface through the hose 28. The sampler (Fig.2) accepts incoming into the well gas from only one side of the hole 26, other insulating side holes, evenly spaced along the entire length of the casing-bore 25. Casing-bore 25 having a tapered tip 27 is set to peat accumulation without preliminary drilling by shock indentation in the ground and record the occurrence in soil p�styluses the bottom of the swamp at 50-60 cm. Doing this to prevent damage to the structure of the peat, for her the most dense encirclement peat deposits and giving the bore a constant vertical position.

Installed in peat accumulation pipe-hole 25 is placed the sampler (Fig.2). If necessary, make pumping water measured interval. On a metal having a marking of lifting the metal rope attached to the ring 23 of the exhaust valve 18 - the sampler is lowered into the pipe-hole 25 and fixed at the required depth. Any known device that creates a pressure pump, a compressor connected through a silicone reinforced hose 28 to the upper discharge tube 10 sampler, pump air through the inlet nipple-valve 14 into the chamber-the collector 1, and then through the hole 15 and the connecting pipe 17 in the pneumatic chamber 2.

When you create excess pressure in the pneumatic chambers 2 through the inlet nipple of the valve 16 is reset to the outdoors. This limits the pressure of the pneumatic chambers 2.

Pneumatic chamber 2 are located one above and the other below the receiving holes 5 in the housing of the sampler (Fig.2), through which the filling gas receiving chamber 3 of the probe. Camera 2 performs the task of locking the sampler in the well and block postopen�e gas from upstream and downstream of the holes 23 along the entire length of the casing-bore 25.

Generating pressure at the top of the discharge tube 10, the ball-valve 12 in the coupler 4, appressed created by air pressure against the seat of the receiving tube 13 and closes the bottom of the receiving tube 11, thereby preventing the flow of air into the chamber receiver 3.

After installing the sampler at the desired interval, the wellhead is closed to prevent the ingress of debris, dust, rain water, etc. the Depth of the lowering of the sampler is determined by the markings applied to the lifting cable. A gas with a measured interval of peat deposits within the required time into the chamber of the receiver 3 through the side openings 5 of the housing of the probe.

After air chamber filled with air and the sampler is fixed in the borehole, the flow of air pressure in the sampler is stopped.

In the upper discharge tube 10 with the valve, the valve 14 and valve-the valve 16 is closed and the gas accumulated in the chamber-the receiver 3 through the hole of the lower tube 11 rises to the seat of the receiving tube 13, raises the ball valve 12 and flows into the upper discharge pipe 10 to the silicon armirovannogo hose 28 and rises to the surface.

For subsequent changes to the interval of sampling of gas or withdrawal of the probe from the tube-wells 25, produce tension pojemno� metal cable. In this case the exhaust valve 18 mounted in the upper cover 6 of the probe under the action of a stretched metal lifting rope, overcoming the force of the spring 20, is opened and the air in the pneumatic chambers 2, through the valve 18 is discharged to the outside.

The sampler is lowered to the next depth in the pipe-hole 25, is fixed in a similar way, and produce a selection of sample gas with the subsequent interval of the peat deposits.

This complex will allow for sampling with constant space intervals of peat deposits, which gives the opportunity to monitor the intensity of gas evolution and variability of its chemical composition.

Complex for gas sampling, shown in figures 1, 2 and 3, is reliable, because it limits the contact of the sample from external factors that could have an impact, leading to changes in the physico-chemical properties of extracted natural gas. The system allows:

- to select the gas, peat mud, with a predetermined interval vertically peat deposits;

- to determine the relative intensity of the gas recovery and measurement of gas pressure;

- to determine the amount of gas emitted from a given amount of vertical peat deposits;

- to determine the airtightness between the side holes 26 of the casing-bore 25 located in the vertical�gap peat deposits, which is sampling;

- the design of the complex allows you to enter the receiver gas from upstream and downstream side apertures 26 and provides a flow of gas with only one vertical interval directly in the receiver;

- to take samples of gas, minimizing its interaction with the external environment.

The complex benefits from a well-a sampler for sampling gas:

- selection of the sample gas takes place directly by way of its receipt from the desired vertical interval peat deposits, where the gas has not yet had contact with the external environment and do not change their physico-chemical properties;

- the sampler allows in a predetermined working position to isolate the flow of gas from the receipt of adjacent, vertically, of the deep peat deposits. There is an opportunity to see how changes in particular, the chemical composition of the gas in different vertical intervals of peat deposits;

the sample gas is taken directly from each of the studied horizon peat deposits. The sample gas on the chemical composition of the homogeneous characteristic of the chemical reactions in this species the layer of the peat deposits.

The complex casing - bore 25 and the sampler for gas extraction allows to investigate the geochemical regime in the tested horizons of the peat deposits.

When�EP specific performance.

Tests complex casing - well - the sampler (Fig.2) conducted at the site of Timiryazev marshes in studies examining the relationship hydrodynamic regime of the wetland waters and their chemical composition. In the layer of peat Deposit with a capacity of 5.7 meters installed Supervisory casing-borehole 25. Outer pipe diameter - 42 mm, wall thickness - 2.5 mm Through 50 cm along the length of the tubes are grooved side of the hole 26 with a diameter of 5 mm, through which water enters the well. The hole diameter is determined empirically. Casing-bore 25 in the lower part is made cone 27, which facilitates its entry into the soil.

Casing-bore 25 having a tapered tip 27, installed in peat accumulation without preliminary drilling by shock indentation in the ground and fixed by entering the underlying soil of the bottom of the swamp to 50-60 cm This is done to prevent damage to the structure of the peat, for her the most dense encirclement peat deposits and giving the bore a constant vertical position.

Sampling of gas from the casing-bore 25 produced developed by the sampler (Fig.2) in accordance with the developed methodology. According to the sampler the requirements of the selected sample gas with eight vertical intervals.

Samples from�playing the interval of 0.5 m along the entire height of the peat deposits. Installed in the peat Deposit of the tube-wells 25, carry out the pumping of water from the measured interval. On having layout metal lifting the rope attached to the ring 23 of the exhaust valve 18 - the sampler is lowered into the pipe-hole 25 to the desired interval. A vacuum pump through a hose 28 and the upper discharge tube 10 of the probe, the air is injected through the inlet nipple-valve 14, into the chamber of the collector 1, which enters through the holes 15 and the tube 17 in the pneumatic chamber 2. Air chamber 2 is performed in this task with the locking mechanism of the sampler in the well and block the flow of gas from upstream and downstream side apertures 26 along the entire length of the casing-bore 25.

A gas with a measured interval of peat deposits within the required time enters the receiving chamber 3 through the side openings 5 of the housing of the probe.

After the pneumatic chamber 2 filled with air and the sampler is fixed in the borehole, the flow of air pressure in the sampler is stopped.

In the upper discharge tube 10, with the valve the valve 14 and valve-the valve 16 is closed and the gas accumulated in the chamber-the receiver 3 through the hole of the lower tube 11, is supplied to the ball-valve 12, opens it and through the top of the injection tube 10 and the silicone armero�the specified hose 28 rises to the surface.

Under the action of a stretched metal lifting rope, overcoming the force of the spring 20, the exhaust valve 18 mounted in the upper cover 6 of the sampler is opened and the air in the pneumatic chambers 2, through the valve 18 is discharged to the outside.

After that, or raise the sampler to the surface, or lowered into the well casing-well 25 to the next depth and similarly sequentially sampled gas at the following intervals peat deposits.

Complex sample gas contains casing-bore, cylindrical sampler, consisting of three main parts, the upper part of the camera-collector, mid - pipe connection sleeve with internal thread and a groove connecting the upper and lower parts, the lower part of the camera receiver for the accumulation in it of gas flowing through the side openings of the casing-bore, chamber, receiver and collector of the lids, on top of the coupling is located in the discharge tube, bottom - reception tube, over which is placed a ball-valve, the upper discharge tube passes through the chamber-reservoir, the cover is derived outside, are provided on the inlet nipple-valve for injecting air into the manifold and pressure relief valve-a valve for relieving excess air pressure of pneumatic�political chambers arranged one above the other is below the receiving holes in the housing of the sampler in the upper cover of the sampler installed the exhaust valve, the casing pipe is made of n-th number of tubes interconnected outer threaded couplings into one, with the side holes of the same diameter, evenly spaced along the length of the casing-bore.



 

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8 tbl, 9 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: evaluation of fluid inflow fraction from every productive zone of multi-zone productive well comprises determination of pressure at wellhead. Integrated indicator curve (IPR1) is obtained to describe the relationship between pressure and fluid yield from first productive zone and integrated indicator curve (IPR2) is obtained to describe the relationship between pressure and fluid yield from second productive zone. Value for integrated indicator curve at the point of mixing (IPRm) is obtained with the help of IPR1 and IPR2. Initial fluid inflow fraction from first productive zone at mixing points and initial fluid inflow fraction from second productive zone are defined. First total curve of outflow (TPR1) is obtained describing the relationship between fluid pressure and yield, fluid flowing from mixing point to wellhead. First portion of fluid inflow from first productive zone (Q11) and first portion of fluid inflow from second productive zone (Q21) are defined at mixing point with the help of IPRm and TPR1. Machine-readable carrier accessible for processor comprise program including instructions for above listed jobs.

EFFECT: more efficient evaluation of the portion of influx from productive seam.

20 cl, 5 dwg

FIELD: instrumentation.

SUBSTANCE: set of inventions relates to sampling of formations and to analysis at formation estimation and testing. Module of transducers for metering unit is configured for in-well operation. Module of transducers comprises set of transducers for measurement of the formation selected parameters and control system for selective and independent operation of every said transducer of said set. Every said transducer is configured or designed as a discrete transducer element for individual communication and control. Every said transducer can incorporate electronics module to couple electronic components with control system.

EFFECT: perfected in-well transducer systems, hence, enhanced performances.

26 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: determination is carried out in a well equipped with a tubing string with an electric-centrifugal pump and a return valve at the end. In order to determine water cut the well is selected in the middle of an oil deposit with production modes close to the average values for the deposit. The well is operated not less than the time required to reach full operation. The well is stopped and process holding is made till gas separation from the well product and breakage into oil and water. Height of the liquid column is measured, volume of the water cut is determined against the boundary line of liquid and gas and water and oil.

EFFECT: improving accuracy of the water cut determination in the well.

FIELD: oil and gas industry.

SUBSTANCE: method involves identification of a variety of processes and their parameters; with that, processes include drilling and sampling processes and parameters include drilling and sampling parameters. Also, the method involves processing of parameters for each of the processes by means of a special modelling processor creating forecasts related to formation sampling. With that, special modelling processor includes at least one of simulators of a well shaft hydraulic system, a simulator of filter cake of drilling mud, a simulator of formation stream or a simulator of tool feedback. The method also involves classification of forecasts related to formation sampling based on at least one of sample fluid medium quality, duration of sampling process, productivity of sampling process or cost of sampling, and planning of sampling operation based on classified forecasts.

EFFECT: improving efficiency or productivity of a sampling operation of formation fluid medium or operation.

25 cl, 15 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

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