Method of evaluation of static and dynamic levels of fluid in annular space of well equipped with electric centrifugal pump
FIELD: oil and gas production.
SUBSTANCE: invention refers to oil industry and can be implemented at survey of wells. The method of evaluation of static and dynamic levels of fluid in annular space of a well equipped with an electric centrifugal pump includes evaluating of levels by geo-physic methods. Prior to evaluation of levels a hole is made in a face plate. A perforated plastic pipe narrowed in its lower part and secured on external surface of a flow string is lowered together with the flow string and the pump into the well. Bottom of the plastic pipe is arranged 0.5-1.0 m above the pump; an upper end of the plastic pipe comes out to surface through the hole in the face plate. A gap between the plastic pipe and the hole of the face plate is leak proofed; a measuring tape with a level sensor is lowered inside the plastic pipe. Surface of fluid is contacted; a level is measured and the measuring tape is withdrawn out of the plastic pipe.
EFFECT: simplification of measuring procedure of fluid level.
The invention relates to the oil industry and can find application in the study wells.
There is a method of determining the level in the tubes rising through the formation tester for testing (test) wells, which contains measurement Shabnam meter subcritical gas flow, stopwatch, barometer-aneroid flow of air from the pipes and the absolute initial pressure (mm water. Art.), closing washers and timing of rise of pressure in the pipes to the final value. By calculating the change in volume of the empty tubes as the product of the air flow at the time of closure washers, according to the law of Boyle-Mariott determine the initial volume of empty tubes, dividing that their specific volume, determine the level in the pipe (patent RF №2104395, published. 1998.02.10).
The known method is inaccurate due to the indirect determination of level.
The closest to the proposed invention the technical essence is a method of determining the static and dynamic levels of fluid in the casing annulus of an oil well equipped with a centrifugal pump, comprising determining levels of geophysical methods for measurements of gamma-gamma density meter scattering and highly sensitive thermometer in the period of operation of electrical submersible pump. Before starting electr the centrifugal pump to produce additional background measuring gamma-gamma density meter scattering, compare this measurement with the measurement when determining levels during operation of the centrifugal pump and the results of the readings conclude about the presence of oil or oil-and-gas-foam in the range of obtained differences or lack of oil or oil-and-gas-foam in the absence of discrepancies in the testimony (the application for the invention of the Russian Federation No. 2004125694, published. 2006.02.10 - prototype).
The method also provides for the indirect determination of the level and requires the use of high-precision instruments indirect measurement type thermometry, the method is complex, multistage.
In the proposed invention solves the problem of direct determination of fluid level in the well, streamline operations.
The task is solved in that in the method of determining the static and dynamic levels of fluid in the casing annulus of a well equipped with an electric centrifugal pump, comprising determining levels of geophysical methods according to the invention prior to determination of the levels in the faceplate perform the hole at the descent of the column tubing with the pump together with the column lower perforated plastic pipe with a constriction at the bottom, securing it to the outer surface of the column, the bottom of the plastic pipe set at 0.5-1.0 m above the pump, the upper end of the plastic pipe its output to the surface through the opening in the plate, seal the gap between the plastic pipe and hole faceplate, inside the plastic pipe down measuring tape with level sensor in contact with the surface of the liquid, measuring the level and remove the measuring tape from the plastic pipe. Features of the invention are:
1) determination of the levels geophysical methods;
2) implementation of the holes in the faceplate;
3) when you run a string of tubing from the pump together with the column descent perforated plastic pipe, securing it to the outer surface of the column;
4) plastic pipe with a constriction in the lower part;
5) the bottom of the plastic pipe is installed at 0.5-1.0 m above the pump;
6) conclusion the upper end of the plastic pipe to the surface through the hole in the faceplate;
7) seal the gap between the plastic pipe and hole faceplate;
8) the descent inside the plastic tube measuring tape with level gauge;
9) contacting the surface of the liquid;
10) measurement level;
11) removing the measuring tape from the plastic pipe.
The sign 1 is common with the prototype, signs 2-11 are the salient features of the invention.
Existing methods for measuring the level of fluids in the well are indirect or do not provide sufficient accuracy measured the I, how complex multistage. In the proposed method solves the problem of direct determination of fluid level in the borehole, simplify operations, the problem is solved as follows.
Before defining levels in the faceplate perform the hole. During the descent of the column tubing with the pump together with the column lower perforated plastic pipe with a constriction at the bottom, securing it to the outer surface of the column, for example, straps, clamps, etc. the Bottom of the plastic pipe set at 0.5-1.0 m above the pump. The upper end of the plastic pipe its output to the surface through the hole in the faceplate. Seal the gap between the plastic pipe and hole faceplate, for example, paint sealants, entering the inner expanding ring, etc. Inside the plastic pipe down measuring tape with level sensor in contact with the surface of the liquid, measuring the level and remove the measuring tape from the plastic pipe.
For padding the dynamic level it is necessary that the well was in operation. For padding the static level you want the hole was easy. Thanks perforation, i.e. drilled holes in the plastic pipe, filling the pipe fluid is faster than the time required for recovery or decline. The poet is in the study could not take into account the time of filling or time release from liquid plastic pipe.
As the plastic pipe may be used polyethylene, polypropylene, PVC, PTFE pipe, or tube made of other thermoplastic polymers, and their copolymers.
Descent measuring tape outside of the plastic pipe leads to obvineniju column tubing and cable on it and it is impossible to advance the tape down, or up.
Install the bottom of the plastic pipe at 0.5-1.0 m above the pump promotes complete coverage of all possible changes of level in the well.
The diameter of the weight measuring tape is 14-16 mm, a Sufficient inner diameter of the plastic pipe 18-20 mm. For fast filling the plastic tube with liquid in it, drill the holes with a diameter of 7-9 mm every 1-2 meters To avoid falling weight with ribbon in the hole when you tape the bottom of the pipe should have a narrowing or may be partially extinguished. Specific example
Spend the definition of the static liquid level in the annular space of wells equipped with electric centrifugal pump. The inner diameter of the casing is 154 mm, an Outer diameter of the column tubing is 73 mm Centrifugal pump brand ACNW 5-8-100 should be placed at a depth of 70 meters
Before defining levels in the faceplate in the discharging hole diameter 30 mm During the descent of the column tubing with the pump together with a column down the cable to power the pump and perforated plastic pipe made of polyethylene with an inner diameter of 20 mm, a wall thickness of 2.5 mm and a narrowing in the lower parts up to a diameter of 8 mm Plastic pipe is equipped with a 8 mm-diameter holes every 1.5 m Reinforce plastic pipe every 2 m on the outer surface of the column straps. The bottom of the plastic pipe set at 0.7 m above the pump. The upper end of the plastic pipe its output to the surface through the hole in the faceplate. Seal the gap between the plastic pipe and hole faceplate filled with sealant. Inside the plastic tube down measuring tape lektromagnitnogo sensor type UIC-TE with the electrode and sinker. When fixing water level in the well on the built-in sensor electronic unit appears sound and light signals. Contact with the liquid surface, measure the level and remove the measuring tape from the plastic pipe. Determine that the static fluid level in the well is at a depth of 40,85 m
Run well. Supply power cable for electrical submersible pump and pumped from the well water for 2 days. Inside the plastic tube down measuring tape contact surface is part of the fluid, measure level and remove the measuring tape from the plastic pipe. Determine that the dynamic fluid level in the well is at a depth of 58,12 m
This is a direct way to determine with high accuracy static and dynamic fluid level in the well.
The application of the proposed method will allow to solve the problem of direct determination of fluid level in the borehole and to simplify operations on the measurement. The proposal also allows you to keep accurate monitoring of freshwater, including drinking water when used in the national economy.
The method of determining the static and dynamic levels of fluid in the casing annulus of a well equipped with an electric centrifugal pump, comprising determining levels geophysical methods, wherein before determining the levels in the faceplate perform the hole at the descent of the column tubing with the pump together with the column lower perforated plastic pipe with a constriction at the bottom, securing it to the outer surface of the column, the bottom of the plastic pipe set at 0.5-1.0 m above the pump, the upper end of the plastic pipe its output to the surface through the opening in the faceplate, seal the gap between the plastic pipe and hole faceplate, inside the plastic pipe down the Deputy is strong tape with a level sensor, contact with the liquid surface, measure the level and remove the measuring tape from the plastic pipe.
FIELD: oil industry.
SUBSTANCE: invention refers to oil industry and can be used when determining liquid level in the tube space of the well equipped with electric centrifugal pump. Method of determining liquid level in the tube space of the oil well equipped with electric centrifugal pump involves determination of liquid level by using geophysical methods as per the measurement data of gamma-gamma densitometre as to scattering, which were obtained at different times during the pump operation. In addition, measurements with gamma-gamma densitometre as to scattering are performed before the pump is started, then immediately after the pump is started, and after that uninterruptedly during the pump operation. At that, difference between the liquid level measured immediately after the pump is started and the liquid level measured before the pump is started is accepted as H reference level difference. Actual liquid level at each moment during the pump operation is determined by taking H reference level difference from the liquid level measured at each moment during the pump operation. The pump is deactivated when actual liquid level reaches the pump installation level of 5-7 m.
EFFECT: improving liquid level determining accuracy, decreasing the number of emergency situations, increasing the life time of electric centrifugal pumps, and increasing efficiency and output of oil.
FIELD: oil and gas industry.
SUBSTANCE: invention relates to research of gas- and oil producers and can be used for control of fluid level in hole during the process of its operation. For this level metre contains controller, connected by first data-out with winding out at least one electromagnetic solenoid, connected by controlling outs with outs of at least one depress valve in borehole annulus. Valve is geared with nozzle slide valve of borehole annulus. To first data-outs of controller it is connected by outs units of pressure measurement and acoustic signal recept. By second data-outs and outs controller is connected, correspondingly, to outs and inputs of unit of registration and data collection about the liquid level in borehole. Additionally at least one electromagnetic solenoid and unit of registration and data collection are located in the vessel with ability of pressure-tight joint with nozzle of borehole annulus.
EFFECT: reliability growth of level metre operation, reduction of its power consumption and reduction of overall dimensions, specified by new schematic structure of the device.
8 cl, 1 dwg
FIELD: physics, measurement.
SUBSTANCE: invention relates to measuring technique and can be used for measuring the level of oil and water in the annular space of a deep-well pump bore hole. Measuring device is lowered into the bore hole using a rope and the tension and the running depth of the rope. After reaching the levels to be measured the device creates a dynamic jerking of the rope. After reaching the level of oil and water the rope is jerked once again. The running depth of the rope at the moment of jerking is recorded on the surface, determining this way the depth level of the well fluid and the thickness of the layer of oil. The jerking of the rope when it reaches the metre is carried out by sequential release of two loads, placed in the case of the device. The release of the first load is carried out when it reaches the level of the liquid, and the second - when reaching the division of the water and oil. The lock holding the first load, is released when the lock is acted upon with any liquid, and the lock, which holds the second load is released only when the lock is acted upon by water. The depth of the level of oil and water is determined by the distance between the dynamic jerks during the lowering of the device using the rope.
EFFECT: increase in accuracy of measuring and widening the functional capabilities.
FIELD: survey of boreholes or wells, particularly measuring depth or liquid level, namely equipment to measure depth of cable-suspended assembly location inside well.
SUBSTANCE: method involves determining length of cable lowered in well from ground surface; dividing cable length into several sections, wherein each section is set as member with effectively constant tension; determining tension in each cable section in well, cable extension for predetermined tension of all sections; determining assembly location depth from cable length lowered in well from ground surface and from cable extension inside well.
EFFECT: increased accuracy of assembly location depth determination.
9 cl, 1 tbl, 4 dwg
FIELD: well survey, particularly measuring depth or liquid level.
SUBSTANCE: method involves arranging acoustic wave source near well bore cavity and installing acoustic wave receiver from opposite side thereof in immediate proximity to well bore cavity, wherein acoustic wave source may generate acoustic signal on pre-selected frequency with predetermined signal strength and provides change of above frequency, acoustic wave receiver may detect substantial acoustic signal strength decrease as frequency changes; determining frequency corresponding to detected substantial acoustic signal strength decrease and calculating well bore cavity depth from above frequency.
EFFECT: increased reliability and accuracy of well bore cavity depth determination.
15 cl, 6 dwg
FIELD: survey of boreholes or wells, particularly measuring depth or liquid level for obtained survey data binding to geologic profile.
SUBSTANCE: method for well depth determination with the use of marks installed along casing pipe length and by reading above marks involves moving marking unit of marking plant arranged in the well along with investigating geologic profile and determining structural casing pipe members; binding geologic profile and structural casing pipe members to depth, wherein geologic profile binding is carried out from data obtained by natural rock radioactivity module and structural casing pipe members binding is performed with the use of clutch locator module, which are connected to logging cable and are lowered in well along with marking plant.
EFFECT: increased accuracy of well depth, geologic profile and structural casing pipe member boundaries determination from well survey.
FIELD: well research, possible use for determining and controlling static and dynamic oil level in product wells.
SUBSTANCE: in accordance to method, signal s0(t) is generated in form of a sum of rectangular impulses, changing time of n-th impulse and its duration depending on n. Generated signal s0(t) is sent to generator of acoustic signal for generation thereof. Acoustic signal s1(t) reflected from liquid is transformed to electric signal and subjected to analog-digital transformation. Signal s0(t) is subjected to folding operation with digitized reflected signal s1(t), and then temporary position of signal reflected from liquid is determined relatively to moment of generation of acoustic signal in inter-tubular space, using which, level of liquid is determined.
EFFECT: possible control over level of liquid in wells with high value of signal/noise ratio, resulting in decreased probability of error during computation of level.
5 dwg, 3 tbl
FIELD: technology for controlling technological parameters of product wells, possible use for remotely controlling dynamic level of liquid in wells equipped with pump plants.
SUBSTANCE: in accordance to suggested method, acoustic probing signal is generated in turns by changing plant operation mode, while measured on well mouth are pressure falls in annulus space, which are then transformed to symmetric counter-phase signals, which are filtered of interferences, amplified with suppression of cophased components and electromagnetic background inductions and amplified signals are transformed to code series, which is transferred via communication channel to dispatching station, decoded and recorded in form of echograms of changes of plant mode. Recording of echograms is performed until producing a series of reflected signals with equal time intervals between them and similar starting phases. Change of plant mode is performed during period of time, duration of which is selected based on condition of fading of reflected signals down to level of acoustic noises of well, and when given time period expires, previous mode is restored, produced echograms are compared to each other and level of liquid is determined.
EFFECT: increased technological efficiency of control procedure, decreased laboriousness of same.
5 cl, 2 dwg
FIELD: oil well survey, particularly to control liquid level in well during well operation without gas outburst in atmosphere.
SUBSTANCE: echo-sounding device comprises body to be connected to casing pipe head nipple by means of adapter coupling, as well as acoustic pulse generator, acoustic pulse receiver made as piezoelectric microphone, pressure transducer and control unit. Acoustic pulse generator is made as piezoelectric cell provided with pulse amplifier made as diffuser and electrically connected with electric pulse generator. Control unit is provided with pre-programmed processor adapted to automatically correct measurement results with taking into consideration speed of pressure acoustic pulse propagation and gaseous mixture composition in annulus. Leads connected to pressure transducer and piezoelectric microphone are attached to electric pulse generator and linked to terminal of multiple-conductor cable extending from control unit to above pulse generator. The piezoelectric microphone may be installed in front of diffuser, which is located as close as possible to adapter coupling. The echo-sounding device may be installed in quickly-releasable case having hinged lid provided with lock.
EFFECT: increased echo-sounding device reliability.
4 cl, 2 dwg, 1 tbl
FIELD: survey in boreholes or well, particularly for measuring depth or liquid level.
SUBSTANCE: method involves preliminarily securing downhole instrument to logging cable end so that the downhole instrument is spaced Lb distance from basic magnetic mark previously formed on cable armor; lowering downhole instrument in well or lifting thereof; detecting magnetic marks on moving cable by reading thereof with the use of reading apparatus; registering magnetic mark location on logging curve and calculating downhole instrument landing depth Li based on magnetic mark detection; determining cable movement direction V; arranging an assembly including connected in series demagnetization means, magnetic mark application means and reading apparatus along moving logging cable at well head, wherein the reading apparatus is spaced fixed distance ΔL from mark application means along cable and the assembly is arranged so that basic magnetic mark is initially located between demagnetization means and reading apparatus; fixing distance L0 between reading apparatus and downhole instrument landing depth reference point; demagnetizing logging cable armor entering into demagnetization means, wherein if reading apparatus detects magnetic mark on cable armor difference between Lb and L0 is taken as the downhole instrument landing depth Li; applying new magnetic mark on cable armor with the use of magnetic mark application means and taking this magnetic mark as the basic one, wherein value determined with the use of above calculated downhole instrument landing depth Li, distance L0 and fixed distance ΔL and information about logging cable movement direction is taken as the new Lb value; providing following calculation of downhole instrument landing depth Li with the use of the new basic magnetic mark and new Lb value; storing values corresponding to Lb, ΔL and L0 distances in signal form after determination or change thereof. In particular case prospective value of magnetic mark detection point displacement relative start thereof is determined and the determined value is additionally used for new Lb value calculation. Current cable movement direction may be compared with prospective one and the comparison results are used for downhole instrument landing depth Li with the use of Lb value. Device for above method realization comprises cable movement direction determination unit, assembly including the first demagnetization means, the first magnetic mark application means, reading means, the second magnetic mark application means and the second demagnetization means, as well as two commutators, OR circuit, memory unit and calculation means. Above components are arranged in series along cable length. The reading apparatus is spaced the fixed distance ΔL from both mark application means and is spaced the fixed distance L0 from downhole instrument landing depth reference point. The device may also have comparing unit, which compares current cable movement direction with prospective one.
EFFECT: increased accuracy of downhole instrument landing depth determination.
5 cl, 4 dwg
SUBSTANCE: invention relates to mining and is provided predominately for subsurface video surveillance, particularly for implementation of visual verification and automated flaw detection of condition of boreholes. Device for video surveillance of well includes sealed outboard unit with video camera and hermetic enclosure, which contains lamp, unit of secondary current supply, remote sensing unit, unit of input and sealing of hoist cable and electric signals converter. Additionally outboard unit additionally contains radiator, linked to environment, heat-conducting container, into which it is placed video camera and coolant, based on the Peltier effect.
EFFECT: providing the ability of video surveillance of boreholes in conditions of elevated temperature.
2 cl, 1 dwg
FIELD: oil industry.
SUBSTANCE: system consists of upper cable plug (UCP) and lower cable plug (LCP) and a body. At that, UCP is provided with cable cords (CC) uniformly located in a circumferential direction and covered with an insulation material, and plugs without being insulated are installed on CC ends. Body is provided with CC uniformly located therein in a circumferential direction, on top ends of which there installed without insulation and located in the body cavity are tips, and with a gasket with holes for CC. At that, LCP is provided with CC covered with insulation material and uniformly located in a circumferential direction and with a flange wherein two holes for mounting elements are made. In UCP and LCP body insulators with holes for CC are located. Seal rings are located in the joints between UCP and the body along the mating cylindrical surfaces. Body and LCP are provided with seal rings located on their external surface, and UCP is provided with a flange with two holes for mounting elements. Body is made in the form of a shell inside which insulators are located with CC uniformly located in a circumferential direction and equipped with limit stops preventing their axial movement. At the shell bottom there made are holes for CC covered with insulation material for LCP and coaxial relative to CC located in the body. Upper part of the shell is made in the form of a hollow cylindrical sleeve coming out of the flange provided with two holes for attaching the mounting elements and coaxial relative to the holes made on UCP flange. Gasket is located in the upper part of the body and locks insulators, and its holes are made for CC covered with insulation material for UCP and are coaxial relative to CC located in the body, on lower ends of which the tips are installed without insulation. Plugs without LCP insulation are installed on CC ends. Tips are collet-type and are provided with spring rings. All joints of tips and plugs with CC ends are threaded.
EFFECT: providing reliability and efficiency of the system for connecting the submersible electric motor to the power cable on the well's top, protected against action of the well's corrosive medium and delivered to the site with maximum availability.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to geo-physical surveys of wells and can be implemented at assembly of well apparatus of telemetry system. The unit consists of an internal threaded bushing and of thrust half-rings. The unit also contains a nut-fairing and a profiled bushing with a flange; on the end of the profiled bushing there are made lugs, while response slots are made on the internal threaded bushing. Also one of the lugs of the profiled bushing is thickened in radial direction, while a module, whereon bushings are assembled, has a slot and a circular groove for the thickened lug; an orienting slot is cut on the flange of the profiled bushing; the response lug entering the orienting slot is made on the end of the second module.
EFFECT: upgraded reliability of assembly modules of telemetric system and improvement of its consumer characteristics.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil industry and can be implemented at operation of oil wells, where depth electric centrifugal pumps are used as cable inlet of high pressure. To achieve the said, the cable inlet is equipped with two sealing packages. One of the packages consists of a complex back-up plate, of a solid cone seal and of a complex packing washer. The second sealing package consists of a complex back-up plate, of a solid cylinder seal and of a complex packing washer. The cable entry with double sealing package is equipped with two bearings installed on each sealing package. A case is equipped with two channels for pressurisation of the cable inlet with double sealing package; the channels are located between sealing packages and are equipped with two plugs installed in these channels.
EFFECT: facilitating control over pressure tightness of cable inlet during operation, simplified installation of cable inlet, also possibility to use cable inlet for existing well stock.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to equipment for well head pressurising and can be implemented at geophysical survey in horizontal wells with excess pressure at well head by means of geo-physical instruments connected to flow string of small diametre and lowered into well on geo-physical cable together with flow string. When instruments and pipes pass through the well head, pressurising is performed by means of a tube preventer and pipe pressurising facilities. When the geo-physical cable passes through the well head, well head pressurising is performed by means of a cable preventer and attached lubricator. Transition from pressurising with one elements of equipment to pressurising with other elements of equipment is carried out using a special three-coupling branch, arranging it so, that closed die-heads of the pipe preventer are located between two lower couplings of the branch, while the upper coupling is located above an upper flange of pipe pressurising facilities.
EFFECT: expanding functionality at performing survey of horizontal wells and increasing reliability of well head pressurising in process of survey.
5 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to well survey and can be used for borehole cable (BC) geophysical instruments (GI) moving-in to boreholes of inclination angle exceeding 50 degrees. Shielding container fixed on the end of drill column (DC) containing number of drill pipes with upper and lower sectors of DC is lowered. GI is lowered on BC into the borehole. Herewith after drilling to preset depth is complete, DC is lifted to the beginning of intensive borehole crookedness. Upper pipe is disassembled, while lower pipe contains mounted lower module with provided GI with packer neck. Upper pipe is mounted on lower module thereafter lowered to preset depth. GI running is performed on one-piece BC. After running is complete, upper module is mounted above upper pipe of DC. Modules are designed as pipes widened to lateral part of casing pipe thus providing free passage for BC between upper pipe of DC and casing pipe. The shielding container represents a magnetic trap of internal boom drift diameter greater than that of DC, and consists of the case. Lower side face of the case contains a magnet, while lower end side includes wash wire guard.
EFFECT: possibility to run GI on one-piece BC without complete rigging-down required.
2 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to directed drilling equipment, namely to measuring equipment retentions in hermetic enclosure of electronic module of downhole device. The offered electronic module of downhole device contains the enclosure cross-armed in electric divider, radiator with upper end face containing electrical connection to generator, dampers between which there is chassis mounted with electronic components and inclinometer sensors peripheral deposition proof, plug fitting hermetically closing the enclosure from below. Herewith the lower damper contains the puller axially moving in rebore of the plug fitting and radial motion proof by pins. Axial position of the puller is regulated by the screw coaxial to the plug fitting in the hole formed wherein. The hole in the plug fitting is stepped with threaded and cylindrical segments. Cylindrical segment of the hole and the screw are sealed from each other with sealing rings. Threaded segment of the screw is of greater diameter, than cylindrical, and on its end face it contains screwdriver slot from the cylindrical segment. The lower and upper dampers are radial motion proof on the chassis by the pin. The plug fitting is provided with collar over which the plug fitting is pressed to the enclosure end face of the electronic module with sleeve nut.
EFFECT: higher efficiency and reliability of measuring equipment performance and higher overall damper performance due to reduced vibrations ensured by axial fix force control of the enclosure chassis.
12 cl, 3 dwg
SUBSTANCE: facility includes pipe column, pump, packer and subsurface instrument. According to the invention a facility additionally contains a sleeve communicated with the pipe column; the said sleeve is designed with a side aperture located above the packer and under the pump. In the side aperture of the sleeve there is a pipe installed pressure tight; this pipe is installed with its one end inside the sleeve, while with another - outside the sleeve. The pipe ends are made with thread for cable points. The cable points CP-28 are screwed on the pipe ends. A logging cable is secured on the exterior surface of the pipe column. At the top the logging cable is connected with a secondary instrument, while at the bottom it is connected with the cable point CP-28 on the pipe outside the sleeve. Pressure tight cable points CP-28 are connected with a stub cable inside the pipe. On the pipe inside the sleeve the cable point CP-28 is connected with the stub cable of the logging cable, which below is connected with the subsurface instrument, located in the flow of liquid out of a lower bed.
EFFECT: upgraded reliability and efficiency of characterisation of lower bed at simultaneous-separate operation of beds in well.
FIELD: oil and gas production, particularly gas well logging.
SUBSTANCE: device comprises hollow cylindrical body with geared-down electric drive installed in it. Electric drive has tightened drive shaft and electronic circuit. Fluid-tight partitioning bush is arranged in body between electric drive and electronic circuit. The partitioning bush has orifice, which connects electric drive interior with ambient space. Two check valves are arranged inside the orifice. One check valve may be opened by excessive ambient pressure. Another one may be opened under the action of internal excessive pressure.
EFFECT: increased reliability of logging instrument operation due to possibility to compensate pressure applied to output shaft of instruments and elimination of electronic control circuit damage in the case of shaft tightness failure.
FIELD: survey of oil and gas boreholes or wells, namely locating fluid leaks, intrusions, or movements.
SUBSTANCE: pickup probe comprises main body, down-directed lever and up-directed lever. At least one lever has measuring means secured thereto and adapted to determine well fluid characteristics. Down-directed and up-directed levers are connected with main body by means of the first and the second sliding rotary links correspondingly, as well as with the first and the second ends of pressing shoe through the first and the second rotary links correspondingly.
EFFECT: possibility to pass through restricted sections and other obstacles, which interfere in measuring channel throat.
12 cl, 9 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula Ppipe≥ Pwell(Scable/Spipe-1)-QcablexLcable/Spipe<Ptear, where Ppipe - pressure of fluid in pipe, kg-wt/sm2; Scable - cross-section of cable with pipe, sm2; Pwell - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm2; Spipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Qcable - weight of 1 km of cable with pipe, kg-wt; Lcable - length of cable to depth of planned delivery of devices, km; Ptear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm2, determined from formula: Ptear=Ftear/Spipe, where Ftear - tear force for cable according to documentation, kg-wt.
EFFECT: higher efficiency.
3 cl, 1 dwg, 1 tbl