Telemetric system sound bottom support
FIELD: oil-and-gas industry.
SUBSTANCE: telemetric system sound bottom support includes a bottom sub, an electric module protected jacket and a centraliser. At that the centraliser executed as two co-axial elements with radial connections in between. The centralisers internal element is elongated in comparison with an external one, and in the centralisers internal element top part executed a blind hole along its axis, where an elastic element installed, made of non-magnetic material. The elastic element made of titanium or non-magnetic steel, or bronze, or metal rubber, or rubber.
EFFECT: sound bottom support parts lifetime increase, assembly simplification and its reliability increase, the support spare parts and its assembling work content decrease.
4 cl, 1 dwg
The invention relates to the field of geophysical research and can be used in telemetry systems for mounting the electronic module.
Known lower bearing probe telemetry system, which includes the protective cover of the electronic module, plug protective cover, made in the form of a sleeve with external and internal thread, in which the set screw. On the protective cover of the electronic module is installed centralizer, is a hollow cylinder with Windows for the passage of drilling fluid, separated from each other by bridges. The centralizer is connected with the lower sub threaded connection. Tube protective cover locks the position of the electronic module inside the casing and seals the protective cover and the clamp locks the position of the electronic module with protective cover inside the bottom of the sub (the patent for useful model №52101, IPC 7 EV 47/12, Appl. 2005).
In design there are two zones through which drilling fluid can flow into the protective cover of the electronic module: connection of the screw - nut inside the tube and the connection sleeve tube - protective casing of the electronic module.
A significant drawback of the design is intensive hydroabrasive wear on the bottom of the sub and the centralizer due to the impact of abrasive particles contained in the mud races of the thief, on the lintel of the centralizer. In the location of the centralizer decreases the area of the orifice increases the speed and changing the direction of fluid flow, eddies are formed. The turbulence increases. Especially the rapid wear of the sub and the centralizer is observed when drilling in the conductor, as at this stage the drilling fluid contains sand and particle species, and the flush fluid flow maximum. As shown, the usual resource of the lower sub is about 300 hours.
Objectives of the invention are increasing the life of parts of the lower support probe, simplifying the design and increasing its reliability.
The problem is solved in that the lower support of the probe telemetry system, including the lower sub, the protective cover of the electronic module and the centralizer, the centralizer is made in the form of two coaxial elements with radial ridges between them, while the inner element of the centralizer is lengthened compared to the outside, and in the upper part of the inner element of the centralizer on its axis made a blind hole, which has an elastic element of a nonmagnetic material. The elastic element can be made of titanium, non-magnetic steel, bronze-metal or rubber. The inner element of the centralizer has a conical surface at the top and bottom h is s.
The drawing shows the lower bearing of the transmitter telemetry system.
The lower bearing of the transmitter telemetry system contains the bottom sub 1, which is an electronic module 2 in the protective cover 3 and the clamp 4. The clamp 4 is made in the form of two coaxial elements 5 and 6 with a radial crosspieces 7 between them and connected with the lower sub 1 threaded connection. The inner element 5 of the centralizer is lengthened in comparison with the outer 6. The lower portion of the element 5 is a flow has a conical surface 8 for a smooth change its direction. The upper portion of the element 5 has a conical surface 9 for centering the electronic module in a protective cover relative to the bottom of the sub 1. The inner element 5 of the centralizer has a cylindrical surface 10 for radial fixing and a flange 11 for axial fixation of the protective casing. Along the axis of the element 5 is made blind hole 12, which has an elastic element 13, the locking position of the electronic module in a protective cover.
The elastic element is made of a nonmagnetic material, such as titanium, non-magnetic steel, bronze-metal, rubber, etc.
In the zones of connection with the lower centralizer sub and clamp with protective cover electronic module installed sealing ring 14.
The Assembly of the probe ensures the in the following sequence.
Insert the electronic module 2 in the protective cover 3. In the hole 12 of the centralizer 5 put the elastic element 13. Insert the clamp 4 in the bottom sub 1, and the conical surface 9 of the upper part of element 5 allows to center the cover of the electronic module relative to the bottom of the sub. With tightness twist the centralizer in the bottom sub to clamping flange 11 with the end of the casing 3.
The advantages of the proposed technical solutions:
1. Simplified design of the lower support tube: the centralizer, in addition to its direct function, the function of the tube - holds the electronic module inside the protective casing and seals the protective sleeve.
2. An increased resource of the foot by reducing the degree of impact of the stream on the centralizer due to the smooth change of direction of drilling mud on the conical surface of the centralizer.
3. Improved reliability of sealing the protective cover of the electronic module. The probability of seal failure decreased by reducing the number of zones of possible penetration of the drilling fluid inside the protective cover of the electronic module.
1. The lower bearing of the transmitter telemetry system, including the lower sub, the protective cover of the electronic module and the centralizer, wherein the centralizer is made in the form of two coaxial the elements with radial ridges between them, the internal element of the centralizer is lengthened compared to the outside, and in the upper part of the inner element of the centralizer on its axis made a blind hole, which has an elastic element of a nonmagnetic material.
2. The lower bearing of the transmitter according to claim 1, characterized in that the elastic element is made of titanium, or non-magnetic steel, or bronze, or-metal, or rubber.
3. The lower bearing of the transmitter according to claim 1, characterized in that the upper part of the inner element of the centralizer has a conical shape.
4. The lower bearing of the transmitter according to claim 1, characterized in that the lower part of the inner element of the centralizer has a conical surface.
FIELD: metering equipment.
SUBSTANCE: invention is related to survey of underground formations with application of acoustic measurements performed in well. For this purpose body of acoustic logging tool is made as configured for isolation of receiving elements and electronics in acoustic receiver unit against well environment. At the same time body has an interrupted, alternating structure, which acoustically non-transparent in some zones and acoustically transparent in the others. Body may be modular, with several steps joined one to another. Multiple steps provide for the body that may be used with multiple well logging tools for reduction or elimination of noise transfer to receiving elements.
EFFECT: improved efficiency of survey by elimination of interfering signals and provision of adequate mechanical strength of acoustic logging tool.
47 cl, 9 dwg
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.
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 industry.
SUBSTANCE: invention related for a tubing string disconnection and the following connection to bottomhole equipment. Proposed hydraulic installation device consists of a case, a connecting unit and a collet, a nut. The case executed borings for bores on the collet leafs, which depth is equal to bores height. In the connection unit, between top and bottom parts executed radial holes for washing and located in staggered order. The boring executed stepped with two bores, the boring of the smaller diametre is for sealing, boring of the bigger diametre for the piston with cylindrical step displacement. At that length of the bottom boring cylindrical part is greater than the top boring length, but smaller than distance from a base of external cylinder case to boring for bores on the collet leafs. The piston executed with a cylindrical step and cannels, on the step for share bolts, in a middle part under the collet leafs and on the ends under sealing. In the piston top end part a ball located and an internal cant executed. The case connected with the connecting unit through the collet and the piston and fixed with a nut. The nut executed with boring for collet base bore.
EFFECT: reliability and efficiency of parker installation works increase, time consumption decrease.
4 cl, 5 dwg
FIELD: oil and gas production.
SUBSTANCE: device includes external fixed housing in which there installed is electric motor with reducing reduction gear, screw gear, upper and lower movable housings with pinion racks, in each of which there installed is a pair of spring-loaded wedging cams; at that, the other pair is turned through 90° relative to longitudinal axis of the device; folding mechanism of lower pair of cams by means of rack, axis with gear quadrant, which is fixed on movable insert; in lower movable housing there made is cam slot, low pair of cams is fixed on the axis in movable insert.
EFFECT: improving reliability, increasing pulling force, increasing movement speed.
FIELD: oil-and-gas production.
SUBSTANCE: invention related to casing string hole clearance cementing , particularly cementing casing string in a well. Hydro-mechanical anchor centraliser, includes cylinder connected to string, inside which installed 3 barrels, working piston, fixed relatively to cylinder with calibrated pin, slide barrel, centralising arms, roller fixed with string, lockers, executed as a T-shaped channels on the barrels bottom, interacting with T-shaped pins, stiff fixed with centralising arms. Slide barrel installed inside cylinder cavity over barrels. External diametre of slide barrel is smaller than cylinder internal diametre. External surface of working piston bottom part made conical for interaction with centralising arms conical surfaces. On the top part of working piston before its conical surface made diametrically opposed gaps, in a way that its bottom part has radial through pins, created along working piston generating line in pins between centralising arms. Core stepped created along external working surface has radial holes with thread, connecting cylinders and core internal surfaces, destroyable plug threaded in it.
EFFECT: anchor centraliser reliability increase and its simplification.
FIELD: oil-and-gas production.
SUBSTANCE: invention related to casing string hole clearance cementing , particularly cementing casing string in a well. Hydro-mechanical anchor centraliser, includes cylinder connected to string, inside which installed 3 barrels, executed as half barrels, connected in pair with each other via seals, working piston, installed under barrels and executed as half barrels, stiff fixed in a conical part, centralising arms, roller fixed with string, lockers, executed as a T-shaped channels on the barrels bottom, interacting with T-shaped pins, stiff fixed with centralising arms top ends, destroyable plug, installed in radial hole with thread, connecting internal cavities of cylinder with string, stepped executed along its external working surface, slide barrel with conical external surface on its top part for interaction with cylinder internal conical surface and radial hole, located under conical surface, installed over barrels and on bigger diametre of the string inside cylinder internal cavity with possibility of radial hole closing with it after anchor centraliser actuation and executed along external diametre, less tha cylinder internal diametre, and actuation, fixed relatively to cylinder working barrel, and on the bottom part of working barrel along generating line radial pins executed in gaps between centralising arms.
EFFECT: anchor centraliser reliability increase.
FIELD: oil-and-gas production.
SUBSTANCE: invention related to mining industry, particularly to oil-and-gas production and can be used for oil and gas wells development Stratum perforation equipment includes geophysical cable, transportation equipment, connected to pyrotechnic equipment. Transportation device executed as a hydraulic engine, connected to drive, located inside a hermetically sealed case, by-turn installed inside of a casing, with ring a gap formation. Also drive executed as a electric motor with a gear mechanism, such as reducer or multiplier. Hydraulic engine has two screw propellers, installed on driven shaft and able to rotate in opposing sides.
EFFECT: supply of pyrotechnic charges into well horizontal section.
9 cl, 9 dwg
FIELD: oil-and-gas production.
SUBSTANCE: downhole chamber contains hollow casing connected to end top and bottom nozzles, allowing longitudinal channels for connection of chambers to pipes located in hollow casing guide ways, helical surface for orientation of valve relative to pocket, operating for its location in chamber and allowing cross channels, communicating inner cavity of pocket to space, enveloping chamber, herewith helical surface for orientation of valve is implemented on bottom butt of top nozzle so, that its external surface contacts external surface of mounting hardware of top nozzle to hollow casing in point through which pass plane of longitudinal section of chamber, inner pass of helical surface is implemented co-axial to longitudinal channels of top and bottom switchers, and hollow casing is separated by solid insert, which is implemented with additional channel, located co-axial to longitudinal channels of end nozzles of chamber, and parallel to it channel of less cross-section, in which it is implemented pocket for valve, herewith in walls of channel of less cross-section there are implemented cross channels, axis of cross channels, placed in plane of cross-section of solid insertion, form to each other blunt angle, and solid insertion is implemented with two side hollows, at that one of vertical walls of each side hollow forms one of external walls of channel of less cross-section, and other vertical wall - is parallel to axis of cross channels, to which it is communicated particular side hollow.
EFFECT: reliability enhancement of operation of downhole chamber.
4 cl, 4 dwg
FIELD: mining engineering.
SUBSTANCE: group of inventions relate to mining industry, particularly to technology and engineering of construction and operation of multidirectional wells. It includes insertable annular bench and device for delivery and installation of annular bench. Annular bench is implemented from one or more co-axial connected to each other into set of thin-walled bushes. Each bush is implemented from spring steel with longitudinal for full height cut and with incisions on external surface. Device for delivery corresponds top and bottom reducing taper elbows, connected to each other by rod, between which it is installed flexible hydraulic chamber. Bushes, tie up by strip belts, are located in device of delivery of and lowered to the place of bench installation, after what hydraulic pressure is supplied, from which at expansion of flexible hydraulic chamber strip belts are destroyed, and bushes are impacted to inner surface of casing pipe, forming united bench. After pressure relief device of delivery is returned to the surface. It provides azimuthally-oriented fit in casing pipe of previously drilled well of bench for installation and orientation on it of manufacturing equipment, requiring ejection to bottom.
EFFECT: it provides regulation of bench weight-carrying ability, allowing pass of maximum possible diametre in bench without additional operations that provides well's operation lower the bench.
4 cl, 8 dwg
SUBSTANCE: invention refers to mining, particularly to oil and gas production industry and can be implemented at oil and gas well completion. The facility for delivery of logging equipment into well consists of a logging cable and of a facility to transfer logging equipment in the well made in form of a housing, inside of which a hydraulic promoter is installed; the promoter is made in form of two screw propellers and is connected to a drive; also the drive is installed in a geometry case and arranged in the case with a circular gap, while two screw propellers can rotate in opposite directions.
EFFECT: increased reliability of logging equipment delivery on horizontal section of well owing to elimination of logging cable twisting.
9 cl, 8 dwg
FIELD: oil and gas production.
SUBSTANCE: invention refers to construction and operation of oil and gas wells, particularly to sealing of annular space of casing liner in well. The facility consists of a transporting column, of a packer unit in form of a mandrel, of a sealing element installed therein, of cone for the sealing element connected to the mandrel and of a puller interacting with the sealing element. The puller is arranged outside the mandrel and connected to it with at least one shear element; also the puller is connected to the transporting column with a detachable unit. Notably, the facility is equipped with an anchor in its lower part; the anchor serves for engagement with internal relief surface of the liner in its upper part.
EFFECT: facilitates simplification of design of facility, increased reliability of its operation and expanded functionality.
5 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil and gas industry, particularly to anchors designed for adhesion with walls of well and for further transmitting of well equipment forces onto them. It is the technical purpose of the invention to increase reliability of the design and to facilitate possibility to install the anchor in a well both by the method of rotation of flow string and by the method of axial displacement of flow string depending upon incline of sections of the surveyed well. The anchor consists of a rod with stops, of a rigidly secured to the rod adaptor with a cone and slots, of wedging screw-thread dies designed to travel relative to the cone and interacting with a pusher, of a mounted on the rod friction lantern equipped with braking planks, and of a movable shaped lock in form of a ratchet bushing and a branch with responsive ratchet teeth on a lower end and with inclined slits on its side surface for interacting with pins of the friction lantern. The braking planks of the friction lantern are made on external surface with teeth lugs at angle φ to lengthwise axis; the rod is equipped with inclined slots made at angle to one another and united with a horizontal slot; also the branch is spring loaded relative to a case of the lantern, while the inclined slits on side surface of the branch turn into horizontal ones.
EFFECT: increased reliability of design and facilitating possibility to install anchor in well both by method of rotation of flow string and by method of axial displacement of flow string depending upon incline of sections of surveyed well.
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