Device functioning as packer or temporal stopgap
SUBSTANCE: invention concerns geophysical methods of well investigation and can be applied in well bore zone sealing during logging research. The device comprises a transformable frame holding a fluid-stopping unit. This unit includes a fiber layer made of organic or natural polymers and/or fiber glass. Additionally the device includes fiber a collecting unit made of permeable fabric, net or perforated material. Also the case holds a spring or umbrella unit implementing case expansion in a borehole. The case is made of materials at least poorly soluble in oil well fluid.
EFFECT: streamlining of technology packer placement in a well.
The invention relates to the field of geophysical methods of research, namely geophysical methods of exploration, and can be used for the sealing of the well bore formation in the process of conducting logging studies.
Known (RU, patent 2018631) swab for isolation zone absorption in the drilling of wells containing tape-filiform filler, drilled goods made with the possibility of its placement in the wellbore in the working position, and tape-filiform filler made in the form of a beam which can be unfolding in the flow of cement slurry, with one end of the ribbon beam-filiform filler is rigidly connected with drilled cargo.
The disadvantage of this swab should recognize the complexity of its design and the complexity of installation of the tampon in the well.
Known (RU, patent 2049909) swab for isolation zone absorption during the drilling of wells containing tape-filamentous bulking different density and weight of drillable material, while the fillers contain different sized ribbon scraps and made in the form of a beam, one end of which is rigidly connected with the end part of the cargo, and fillers with a density less than 1 g/cm3associated with the Central part of the cargo, and fillers with a density greater than 1 g/cm3with PE is everynoe part of the cargo.
The disadvantage of this swab should recognize the complexity of its design.
Known ("Geophysical wells, M., "Nedra", 1983, page 32) the design of the packer containing convertible case, and the case contains a remedy for preventing the passage of fluid, which is a layer of fibers made of made of organic polymers and/or fiberglass, and the body is made of material at least partially soluble in the borehole fluid.
The disadvantage of the packer should recognize the difficulty of placing it in the well.
The technical result obtained by the implementation of the proposed design consists of a simplification of the placement of the packer while reducing its cost.
To achieve the technical result of the proposed use of the device performing the function of the packer or temporary tube, comprising a housing in which is located the means preventing the passage of fluid, which is a layer of fibers made from organic or natural polymers, and/or fiberglass, the body is made convertible, and means preventing the passage of fluid additionally contains an element that is designed to collect fibers made from pronice the second fabric, mesh or perforated material, the housing further comprises a means of ensuring the expansion of the casing in the borehole, which represents a spring-loaded or santilly mechanism of material at least partially soluble in the borehole fluid. In the preferred embodiment, when implementing the device body perform as a single unit with the possibility of expansion in the wellbore. This facilitates the process of putting the device into the well. In the case of execution of the body as a whole in the most preferred implementation, the device further comprises means providing an extension of the casing in the borehole, representing spring, Gavrilovna-hinged or articulated santilly mechanisms (similar to the device discussed in U.S. patent 6,915,845).
In one implementation options of the device can be used helical (spiral) spring, including, in the case when the ends of the springs are connected. After the specified device is placed in the area of the creation of the packer or temporary tube, it is activated through the action of a spring or hinge umbrella mechanism that ensures the disclosure of the device. In particular, the activation device can be achieved by the destruction of the means holding the spring or hinge echanism in compressed form. Destruction is possible, in particular, due to the impact of borehole fluid on the tool retention. The device can additionally include a protective cover, which protects it during the descent into the drill column, placed in the well. The specified cover is preferably made of an easily destructible material, and when the unit is in place to establish a temporary plug or packer case mechanically or chemically destroy. When the device acquires the ability to catch the fibers from the upstream of the liquid column. In a preferred embodiment, the implementation of the housing is a wire ball or open top of the body of rotation. The body of revolution may be in the longitudinal sectional shape of a triangle, including with rounded corner, as well as the semi-circle or semicircle. On the upper surface of the housing may be further element is made of permeable fabric, mesh or perforated material and is designed to collect the fibers. The presence of a specified item allows you to more fully collect on the surface of a body falling under gravity fiber. The elements of the body can be made of a material having memory effect. This will allow changing the temperature of scarinci liquid to change the shape of the hull.p> Also, the enclosure can be made of a material capable of destruction in terms of the well. In particular, the components of the housing can be at least partially made of poly-oxopropanoic acid, polyglycolic acid, polyethylene terephthalate, polyamides, polyurethanes or mixtures of these materials. In addition, the housing may be made at least partially from a material that can react with the products of decomposition of fibers and/or at least partially from materials, biodegradable fluid for washing the wells (in particular, of aluminum or magnesium, and their alloys). All this allows you to easily remove the packer or temporary tube by removal (dissolution) of the hull.
In addition, the housing may be made of separate dip into the well of elements forming a well specified case. In this case, the elements can be a fiber with adhesive surfaces and/or fibers are interconnected through physical (magnetic or electrostatic) interaction.
Fiber included in the means preventing the passage of fluid, preferably can be made of polyoxypropylene acid, polyglycolic acid and fiber. Specified means preventing the passage of fluid, may d is additional to contain the swelling of the particles, swelling of the fibers and the reinforcing fibers. Also means preventing the passage of fluid may optionally contain materials that can contribute to swelling or hardening of the fibers through the formation of chemical bonds within the fibers. Hereinafter the invention will be disclosed in more detail.
Initially injected into the well flexible or operational tubing, drill string, the repair column, a sliding clutch, etc. Through these elements is lowered into the well casing of a device made in the form Packed in plastic and deformed frame made of metal, elastomer or plastic (in particular, from the group of polymers of the type polyoxypropylene acid, polietilentereftalata, polyamides, polyimides, polyaramide, polyphenols). The device is delivered to the installation location of the packer under pressure through the tubing (or flexible tubing, oil casing, repair column or another column). In another embodiment, the implementation of the casing is lowered on a cable or on auxiliary rope to the place of its activation. To prevent premature actuation and mechanical protection on the way to the target point, the body is placed in a protective case. The specified case can be made of magnesium, aluminum or plastic materials (i.e. materials that are soluble in acid solutions, strong alkaline what's solutions, chemically active fluids, or materials, slowly dissolving in the borehole fluid). In another embodiment, the cover can be opened using a spring-release mechanism or mechanical contact with the end of the flexible tubing. After placing the body in the place of installation of the packer or temporary plugs and/or dissolution case happens the activation process of the body. Open the casing abuts against the wall of the borehole, which fixes the position in the well packer or packer-tube. The activation method of the hull depends on the method of delivery into the well. The enclosure can be activated using a spring-trigger mechanism, a gas filling, electrical, instrument, mechanical manipulation end of the flexible tubing, smooth wire, the trigger column, or electromagnetic mechanism. Also the case can be assembled in the bore of smaller elements (rods, adhesive fiber, flexible or spring-loaded elements, magnetic elements with the ability to self-Assembly (similar to the process of forming upstream of the filter).
After activation of the hull through him pump a certain amount of drilling fluid with a suspension of fibers. The body is covered with fibers and formed a dense packing, which prevents the passage of interstitial fluid that is formed by the packer or packer-tube, from yuusha desired area of the wellbore. In zavisit from choosing the material for forming the device in the wellbore, it is possible to obtain a temporary tube (made of materials susceptible to destruction or permanent tube (created from durable materials).
The fiber material may be glass, polymer substances (polietilentereftalat, polymer oxopropanoic acid, polyamides, polyaramide, cellulose and other polymers or Homo - or copolymers). Usually fiber pumped into the well through the repair column. The specific size of the fibers is defined by three conditions: the first is the possibility of introducing fibers into the drilling fluid in ground units, the second is the possibility of pumping the resulting suspension through the equipment to the desired level, the third is the ability of the fibers to accumulate on the device with the formation of the tube. The usual size of the fiber is from 3 to 50 mm, but it is better to choose a length in the range of 3 mm to 18 mm, the Diameter of such fiber is from 3 μm to 1 mm, the pumping Conditions are chosen so that these fibers are accumulated on the casing and formed a tight tube. Because of the increased friction educated packer/plug tightly pressed against the wall of the wellbore, in part this is achieved through the interaction of the fiber with the terrain of the wellbore.
If you want to create a temporary plug/packer, the choice of material depends on aegospotamos to destruction in the interstitial fluid. A good example of such material is a fiber made from a polymer oxopropanoic acid. Polietilentereftalata acid works well at high temperatures. To speed up the removal of the temporary packer, use an acid wash (a mixture of mineral and organicheskikh acid or alkaline leaching of sodium hydroxide, which is injected into the wellbore.
To create a permanent tube/packer need to use heat resistant fiber. A good example is fiberglass or separate artificial grass fibres "novoloid". To create temporary or permanent traffic jams, you can use combinations of these fibers or add materials that improve the parameters of the plug or packer. For example, the fiber typically has a high value of young's modulus, therefore, the fiber is more mechanically robust for application in the well than the fibers of polymers with the same diameter (polietilentereftalat or polymer oxopropanoic acid).
In particular, the fiber is usually easily captured and stored on the frame of the device, but the softer material of oxopropanoic acid better be deformacii and contributes to a more dense clogging of the channel under pressure.
Application of the proposed solution allows to achieve the following advantages.
For many downhole operations required to carry out the isolation of one or more zones in the well or pipe. Sometimes isolation plays only a secondary role, it is necessary to facilitate the execution of other downhole operations, and then the temporary tube should be removed. That is, first isolate one section of the well, then perform the main operation, and then a temporary stopper, which provided the insulation is removed. In many cases, the creation or destruction of the locking device, the packer plug or packer requires repeated use of cable, wiring, flexible tubing, operating columns or drill pipe.
This invention shows how permanent or temporary packer-plug or packer may be created in the very well (in situ) with the use of fibrous materials. This invention shows that with proper choice of hull geometry, the required tube of fibrous materials can be created in the borehole using a standard borehole tools.
1. The device performs the function of the packer or temporary tube, comprising a housing in which is located the means preventing the passage of fluid, which is a layer of fibers made from organic or natural polymers, and/or fiberglass, the body is made transformable, is rich tool preventing the passage of fluid additionally contains an element that is designed to collect fibers made of permeable fabric, mesh or perforated material, the housing further comprises a means of ensuring the expansion of the casing in the borehole, which represents a spring-loaded or santilly mechanism, barrel made of material at least partially soluble in the borehole fluid.
2. The device according to claim 1, characterized in that it contains a mechanism with coil springs.
3. The device according to claim 2, characterized in that the ends of the coil springs are connected.
4. The device according to claim 1, characterized in that the housing is an open top body rotation.
5. The device according to claim 1, characterized in that it further comprises a protective cover, which protects it during the descent into the drill column, placed in the well.
6. The device according to claim 1, characterized in that the casing is made from a material having memory effect.
7. The device according to claim 1, characterized in that it is made of elements, separately submersible or supplied under pressure into the well, forming in the well frame for trapping fibers.
8. The device according to claim 7, characterized in that these elements are capable of self-Assembly or samoslivnoy in the wellbore or casing.
9 the Device according to claim 1, characterized in that the casing is made from a material capable of destruction and decay in terms of the well.
10. The device according to claim 9, characterized in that the casing is made at least partially from polyoxypropylene acid, polyglycolic acid, polyethylene terephthalate, polyamides, polyimides, polyurethanes or mixtures of these materials.
11. The device according to claim 9, characterized in that the casing is made at least partially from a material that can react with the products of decomposition of the fibers.
12. The device according to claim 9, characterized in that the casing is made at least partially from materials that are biodegradable fluid for rinsing wells.
13. The device according to claim 1, characterized in that it is made of aluminum, magnesium and their alloys, and mixtures of resins, polyimides, and the filled compositions of these polymers.
14. The device according to claim 1, characterized in that the fiber is made of polyoxypropylene acid, polyglycolic acid, polyethylene terephthalate, polyamides, cellulose or fiberglass.
15. The device according to claim 1, characterized in that the means preventing the passage of fluid further comprises swelling the particles and/or swelling of the fiber.
16. The device according to claim 1, characterized in that the means preventing the passage of fluid further comprises reinforcing the ox is the Korean people's army.
17. The device according to claim 1, characterized in that the means preventing the passage of fluid additionally contains material that promotes the curing of the fibers through the formation of chemical bonds within the fibers.
FIELD: generation of seismic waves in the well.
SUBSTANCE: for generation of seismic energy in rock a downhole system is used, which contains a fluid cavity located between the tube placed inside the well and rock surrounding the well and a device accommodated in this cavity and used for generation of pressure waves that create seismic waves in rock.
EFFECT: creation of the system for generation of seismic waves in the well that does not hamper the mining process in the deposit concerned, does not interrupt it and also makes it possible to use forms of natural energy inside the well or the environmental energy.
42 cl, 15 dwg
FIELD: instrument engineering.
SUBSTANCE: instrument is comprised of basic plate and active laser material fixed between polarised separating prism and partially transmitting mirror. Mirror is mounted onto basic plate so that one part of radiation is reflected by mirror in auto collimation manner and the other is transmitted to photo sensor installed behind mirror when optical radiation comes out of active laser material. Differential frequency measuring unit is connected to photo sensor outputs. Two mirrors are fixed fast to basic plate at equal distance from beam separation point in polarised prism. Two-sided mirror is fixed to piezo-element, which is connected with modular oscillation generator output. Piezo-element is mounted on independent base. When optical radiation from polarised prism hits mirrors, reflected from mirrors beams are directed towards each other and along common direct line, and two-sided mirror is installed perpendicular to the above line and at equal distance from mirrors with the use of piezo-element and independent base.
EFFECT: improvement of seismic distortions measurement sensitivity.
SUBSTANCE: invention is designed to indicate velocity of ultrasonic pulse (UP) in drill mud (DM) under downhole conditions. Two ultrasonic generators (USG) are located next to each other so that the front surface of the first USG is shifted from the front surface of the second USG by predefined radial distance of shift. Thereafter, UP radiation in DM inside the well is carried out by using the first USGM (ultrasonic generator mud); UP, after it has passed the defined distance (d), is indicated. Then, time (t) required for UP to run the distance (d), is defined. The indicated distance (d) and time (t) of passing are used to define ultrasound propagation velocity. The gear for implementing the method includes two USGs disposed on a logging arrangement and a diagram to control time of UP actuation radiated by the first or the second USG or by the two USGs simultaneously as well as to measure time intervals between radiation of ultrasound and detection thereof after it had covered the distance (d).
EFFECT: more accurate evaluation of ultrasonic pulse velocity under downhole conditions; possibility to define drill mud specification.
10 cl, 10 dwg
FIELD: physics; geophysics.
SUBSTANCE: current pulse is excited in the medium under investigation, and parameters of its induced polarisation are defined. Geoelectric section is generated to make a conclusion about the presence of hydrocarbon fields on the basis of abnormal manifestations of induced polarisation parameters. At that, electromagnetic and seismic waves are excited simultaneously or with a time shift. To excite the said waves unipolar rectangular impulses of direct current are generated, their absolute and relative duration depending on parameters of medium under investigation. In the beginning of timing pulse electric field is measured simultaneously at measuring probe groups of two detector lines towed at different depth. Besides, detector line depth and hydroacoustic pressure of seismic source are measured. Also a device is offered, which includes pulse generator, capacitor charging unit, power generator, bank of capacitors, switchboard, seismic emitter, transmitter/receiver line, receiver line, multi-channel gauge, echo-sounder, GPS satellite navigation receiver, signal processor.
EFFECT: higher reliability of research results.
18 cl, 6 dwg
SUBSTANCE: device comprises the seismic recording system containing the aggregate of sources (120) of seismic data which can generate data; at least one system (140) of data capture which uses the open network protocol; and at least one linear net (300) which connects the data sources with the data capture system and using the open network protocol. The linear net (300) includes the aggregate of hubs (130) of data sources where the part of specified aggregate of seismic data sources correspondingly connected to the linear net; and the router (135) for routing the data generated by seismic data sources (120) to the data capture system (140) via data source hubs (130) in accordance with the open network protocol.
EFFECT: method and device realise network infrastructure in seismic data capture system.
23 cl, 10 dwg
SUBSTANCE: device contains the shock mass fixed at the end of the lever which is suspended for its opposite end to enable rotation around the fixed axis, at the platform placed at the vehicle, with possibility of rotating around it, the activating instrument whose mobile load-bearing element is connected to the lever via flexible pulling unit, and the counterbalance installed at the platform on the side opposite to the shock mass. The device is also provided with the tower where the axis is fixed, and the tower is placed at the platform so as to modify the distance to the ground surface via elevating instrument installed at the vehicle. At that, the distance from the fixed axis to the support exceeds that from the fixed axis to the ground surface, and the shock mass is provided with the webbing under its support and made as the radiant unit and connected with the lever via friction joint.
EFFECT: device enhancement and simplification with simultaneous increase in seismic efficiency and productivity.
FIELD: mining engineering.
SUBSTANCE: method differs in that along with microseismic earth noise registration one carries out wanted wave registration, aroused by seismic source and repeated registration of microseismic earth noise. At that registration of microseismic earth noise in working process is carried out in equal number of action on environment with seismic sources, then one defines according to these notes specific vectorial angle of low-frequency component and its part in common microseismic, finds relation of these parameters before and after action on environment with seismic sources. These data are used as additional informational parameters while interpretation of seismic data, taking for prognostic position of hydrocarbon accumulations areas with anomalous raise of microseism energy, and areas of sudden local vectorial angles increase (microseism energy), appearing on data set, received after the environment action of seismic sources are taken for zones of oil-in-water or gas-liquid contact.
EFFECT: improvement of forecast reliability and definition of hydrocarbon accumulation boundaries directly during seismic works.
FIELD: technological processes; measurement.
SUBSTANCE: invention is related to monitoring of cavities filled with liquid in different mediums. Crack oscillations are registered. Frequencies v(n) of standing boundary waves are determined (n - integer), which are distributed along surfaces of at least one crack filled with liquid. Group speed V(ν(n),w) of boundary wave is determined with account of medium and liquid properties and width of crack w. Typical size L is calculated along distribution of stationary boundary wave by formula . System consists of facility for liquid pressure registration in injection well, facility of data processing for determination of frequencies of standing boundary waves, calculation of group speed of boundary wave and calculation of crack typical size along distribution of stationary boundary wave, device for liquid pressure control, which allows to step-wise decrease or increase pressure and device for signal generation, which contains results of calculations.
EFFECT: provision of efficient monitoring of cavities filled with liquid, which may be performed in real time.
13 cl, 6 dwg
SUBSTANCE: depth is measured by means of hydroacoustics positioned on mobile sea objects. The object speed is determined by radio receiver-indicator and satellite navigational system. The vertical sound distribution is determined and sea ground form is reconstructed, then the sea ground surface is plotted. For method implementation the device is put forward containing radiating and receiving aerials, control unit, valuator, pump conditioner, graphplotter and parametrical emitting tract.
EFFECT: increasing of method reliability.
2 cl, 5 dwg
SUBSTANCE: invention relates to geophysical well logging, in particular to a method of polarisation acoustic logging (PAL), and it may be used to evaluate properties of rocks. To this end electro-acoustic transducers (EAT) are used thereby for exciting and logging acoustic vibrations inside a borehole. Said vibrations are perpendicular to the borehole axis, are polarized in the planes running through the borehole axis and are propagated in the form of polarized shear waves (PSW). Moreover, the PSW are exited and logged in at least three planes running through the borehole axis. Three values of a parameter, for instance, PSW wave propagation velocity, determined in the PSW planes, are enough to build an anisotropy ellipse of this parameter. To excite PSW according to this method, monopole EAT transducers are used, having a single-directional pattern for radiation in a plane perpendicular to the instrument axis. EAT transducers that are similar to radiation sources and spaced in the PSW planes are used for logging the PSW.
EFFECT: increasing the information capacity of PAL; decreasing the complexity and cost of PAL equipment.
FIELD: drilling equipment, particularly devices for assembled blowout equipment pressure-testing.
SUBSTANCE: device comprises shaft with central channel and elastic packing member installed on the shaft. Connected to lower shaft end is lower sub provided with radial channel. Shaft has central part shaped as truncated cone. Elastic packing member is installed on the shaft so that it may slide in axial direction. Upper part of packing member is made as two collars facing upwards. Diameter of upper end of lower sub exceeds that of lower cone base.
EFFECT: increased operational reliability of the device.
FIELD: oil and gas production, particularly well interior separation for reservoir isolation one from another.
SUBSTANCE: device comprises packing members with elastic collars and reaming members, seating tool connected to lifting pipes and having lower part telescopically put on technological pipe, anchor, well screen and check valve. Each reaming member except for upper one is connected to body of each next upper packing member from below through intermediate pipe or pipes. Lower packing member body is secured to support pipes. Well screen is included in support pipe and/or one or several intermediate pipes opposite to each reservoir to be developed or treated. Check valve is located over upper well screen. Reaming member is made as thrust secured to telescoping pipe. Thrust of upper packing member has inner cavity and is connected to upper telescopic pipe by shear members so that the thrust may slide with respect to the pipe in axial direction. Thrust sliding is limited by upper annular widened section of upper telescopic pipe arranged inside thrust. Anchor is located over upper packing member thrust.
EFFECT: possibility to operate in wells having non-calibrated inner diameter, increased air-tightness of well interior separation.
2 cl, 1 dwg
FIELD: oil well drilling and operation, particularly for selective well hole flushing to prevent mud accumulation therein.
SUBSTANCE: device comprises body 1, stem 8, sealing member 2, bush 4 and delivery unit. Device also has fixed bush 5 and spring-loaded differential disengaging bush 6 installed inside fixed bush 5. Additional differential bush 9 is arranged between body 1 and stem 8 so that the bush is spring-loaded relatively the body 1. The bush 9 has slots to receive stop 11 for bush fixation and for bush 9 movement limiting. Cap is arranged in lower body 1 part. Piston 15 is installed inside stem 8 and define oil chamber along with the stem 8. Radial channels 24 are made in body 1 and in additional differential bush 9. Engaging cone 16 comprising sealing sleeves 17 is installed at upper stem 8 end. The sealing sleeves 17 restrict device installed in collet clip from displacement in radial and longitudinal directions.
EFFECT: increased reliability of device installation and removal from well, extended conditions and possibility to perform technological operations due to possibility of repeated device installation and removal from well.
2 cl, 7 dwg
FIELD: oil production, particularly pipe string pressure-testing inside well.
SUBSTANCE: packer comprises setting tool, lowering device made as cable head with cable, cylindrical body with seat and central axial and radial channels connecting outer body space with central axial channel thereof, sealing member installed on the body and bush sliding in axial direction. The bush has support anvils and is installed in the body. Pipe string section below pressure-testing interval has test clutch provided with calibrated central channel with inner diameter d less that inner diameter d1 of pipe string. The pipe string has annular depression located over test clutch and having large pipe string clutch joint dimensions in longitudinal direction. Support anvils have longitudinal dimensions B corresponding to longitudinal dimension L of annular depression formed in test clutch and are spring-loaded outwards by means of spring plates. The support anvils are inserted in radial body channels. The body has technological pipe located in top part thereof. Body seat is made as restricted section of central axial channel located below radial channels. Sealing member is outside the channel and is installed on the body. The sealing member may air-tightly cooperate with central channel of test clutch. Bush has widened part formed in center thereof, as well as lower and upper ends having decreased diameters. Lower end the bush cooperates with support anvils from inside and is hermetically inserted in the body seat. Upper end of the bush cooperates with technological pipe from inside. Bush has serially arranged radial orifices and cap arranged upstream of the technological pipe. Cap comprises fishing head. Widened bush section may be engaged with support anvils from inside as support anvils cooperate with annular depression of test bush. Longitudinal short and long turnings connected with each other through figured turning are created on outer surface of technological pipe top. Long turning extends to technological pipe edge. Setting tool is made as pusher connected with lowering device and cooperating with fishing head of the bush from upper part thereof and as pipe installed on the pusher so that the pipe may rotate and move in axial direction. Lower pipe end encloses technological pipe. The technological pipe has inner pin cooperating with technological pipe turnings. In initial position the pin is arranged in short turning.
EFFECT: possibility of low-diameter pipe pressure-testing, decreased metal consumption and costs.
FIELD: oil and gas production industry, particularly pressure-testing of cased well provided with flow string.
SUBSTANCE: method involves filling well with gravity solution; lowering inflatable packer connected to hollow logging cable in well along flow string; leading inflatable packer out of flow string and sealing cable lead in flow string at well head; injecting light-weight liquid in inflatable packer via hollow logging cable up to packer expansion and setting in casing pipe under flow string, wherein light-weight liquid has density of not less than that of well liquid; continuing light-weight liquid injection in packer via logging cable along with injecting gravity solution from well head into well hole annulus; maintaining cable interior and hole annulus pressure difference at threshold inner cable pressure level predefined by technical specifications; measuring pressure in hole annulus and recording pressure change; releasing pressure from logging cable and from hole annulus along with maintaining cable interior and hole annulus pressure difference at threshold inner cable pressure level predefined by technical specifications; lifting hollow logging cable and inflatable packer from well.
EFFECT: increased efficiency.
FIELD: mining, particularly sealing or packing boreholes or wells.
SUBSTANCE: device comprises hollow body made so that body interior may be sealed. The body has head for fishing tool receiving. Anchoring unit with seat may cooperate with flow string joint in lower section of interval to be pressure-tested. Sealing unit includes sealing means and seating mechanism. Annular isolation means is formed as part of movable hollow body section. Additional seating mechanism seal is arranged from the first isolation means side. Additional seal is sleeve having L-shaped cross-section. Opened sleeve end faces elevated pressure cavity. Gland is installed from another side of annular isolation means. The gland is in contact with fixed section of hollow body arranged in anchoring unit seat. The later is installed at flow string joint. Protective case is installed on fixed hollow body section.
EFFECT: simplified structure and increased reliability.
FIELD: oil production, particularly well repair.
SUBSTANCE: device is made as packer assembly including bottom-hole packer adapted to close well annulus due to packer diameter increase under axial compression thereof and pipe arranged in bottom-hole packer cavity. During bottom-hole packer compression the packer slides along the pipe in vertical direction. Device comprises two packer assemblies. Pipe of bottom-hole packer included in upper packer assembly has bottom with orifices and thrust for bottom-hole packer supporting. Device also has outer pipe arranged below lower bottom-hole packer and coaxial thereto. Outer pipe has inner diameter and surface finish to provide sliding thereof along outer surface of pipe located inside bottom-hole packer. Outer pipe has bottom-hole packer thrusts arranged at ends thereof. Lower packer assembly is identical to upper one and is upside down. Lower packer assembly is below upper one and is coaxial thereto. Lower and upper packer assemblies define common outer pipe. Tubing string passes through both packing assemblies through central bottom orifices thereof. Remainder bottom orifices communicate well annulus and clearance between tubing string and outer pipe. Tubing string couplings located over upper packer assembly and below lower one limit vertical bottom displacement.
EFFECT: decreased time and improved well flushing.
FIELD: oil production, particularly downhole device for repeated pipe string interval pressure testing in well.
SUBSTANCE: packer comprises mandrel 1 with figured slot 2 on outer surface thereof. The figured slot 2 has alternating axial short 3 and long 4 sections. Self-sealing collar 5 is installed in upper mandrel 1 part. Located under the collar 5 is support 6. Sealing member 7 and cone 8 are serially installed on the mandrel 1 under support 6. The sealing member 7 is made as self-sealing collar, which prevents liquid flow in top-down direction. Ferrule 9 with guiding pin 10 is installed on mandrel 1 below cone 8 so that the ferrule 9 may slide in axial direction. Guiding pin 10 is located in slot 2 of mandrel 1. Ferrule 9 is provided with springing centralizers 11 and slips 12 arranged along ferrule periphery. Slips 12 are spring-loaded by means of springing plates 13. Head 14 with weight 15 is fixedly connected to upper end of mandrel 1. Head 14 has radial orifices 16 made in upper part thereof. Cap 17 provided with radial pin 18 is installed over the orifices 16. Weight 15 is made as cup put on head 14 and sealing radial orifices 16 so that the orifices 16 may be opened under downward head 14 movement. Through axial grooves 19 are made on outer surface of weight 15. The grooves are adapted for radial pin 18 of head 14 cap 17 receiving. Radial channels 20, which permanently communicate weight 15 interior 21 with ambient space, are made in weight 15. Lower radial channels 23 are created in mandrel 1.
EFFECT: possibility to perform pressure-testing of pipes in low-diameter springs and decreased costs.
FIELD: oil and gas industry, particularly devices for hermetical reservoir isolation.
SUBSTANCE: packer comprises body with central channel and connection pipe provided with shaped slot on outer surface thereof. Packer also has conical depression adjoining connection pipe, movable bush supported by connection pipe and having finger cooperating with shaped slot, as well as spring-loaded centralizer. Slips cooperating with conical depression are connected to spring-loaded centralizer ends. Packer includes upper and lower self-sealing sleeves, check valve, seating tool rigidly connected to tubing string and to body through shear members, hollow sealed rod. The hollow sealed rod comprises radial channels and lower end telescopically sliding inside central body channel. Seating tool is made as connection pipe and has rest on inner surface. Connection pipe interior communicates with ambient space. Hollow rod is closed over radial channels and provided with annular depressions. One annular depression is arranged in lower part, other two ones are located over radial channels. Sealing means is installed in upper depression. Upper and lower springing collars are installed in other two annular depressions. Conical depression of the body is made as upper and lower cones and connection pipe is arranged in-between. Opposite upper self-sealed sleeve and lower sleeve are located over upper cone and under lower cone correspondingly. Centralizer includes upper and lower centering members provided with differently-directed slips. Central channel of the body over self-sealed collar has restriction, which receives hollow rod so that the rod may perform limited axial movement. Radial channels of hollow rod may be communicated with central channel over restriction as hollow rod slides upwards. Upper spring-loaded ring is adapted for adjustable hollow rod fixation as hollow rod slides downwards.
EFFECT: increased simplicity, reliability and manufacturability.
4 cl, 2 dwg
FIELD: oil and gas industry, particularly devices for hermetical reservoir isolation.
SUBSTANCE: packer comprises body with central channel and connection pipe provided with shaped slot on outer surface thereof. Packer also has conical depression adjoining connection pipe, movable bush supported by connection pipe and having finger cooperating with shaped slot, as well as spring-loaded centralizer. Slips cooperating with conical depression are connected to spring-loaded centralizer ends. Packer includes upper and lower self-sealing sleeves, check valve, seating tool rigidly connected to tubing string and to body through shear members and hollow sealed rod. The hollow sealed rod comprises radial channels and telescopically slides inside central body channel. Seating tool is made as connection pipe and has rest on inner surface. Connection pipe interior communicates with ambient space. Conical depression of the body is made as upper and lower cones and connection pipe is arranged in-between. Opposite upper self-sealed sleeve and lower sleeve are located over upper cone and under lower cone correspondingly. Centralizer includes upper and lower centering members provided with differently-directed slips. Central channel of the body has restriction located in lower part thereof and receiving hollow rod so that the rod may perform limited axial movement. The rod is sealed over radial channels. Annular depressions, springing ring and sealing means are serially installed over the radial channels in bottom-top direction. Radial channels may be communicated with central channel over restriction as hollow rod slides upwards. Springing ring is adapted for adjustable hollow rod fixation as hollow rod slides downwards.
EFFECT: increased simplicity, reliability and manufacturability.
3 cl, 2 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: packer has body in form of pipe, whereon collar compactors are placed with limiting washers, saddles for locking tool dropped from surface, cover, upper and lower fixing elements, made in form of anchoring assemblies, upper conical bushing, rigidly connected to pressing bushing and movably to the body, lower conic bushing, made rigidly together with body, guide of this conic bushing made in form of plate spring, placed by one end moveably in guiding groove in lower portion of lower die with teeth, and by other end fixed rigidly on greater diameter of this conic bushing, auxiliary pipe, placed inside the body. Packer in lower portion is provided with check valve, placed inside recess of body, concurrently being also the body of valve. Oppositely to valve saddle on same axis stepped locking bushing is placed with possible sliding inside body recess with limited drive and possible overlapping of radial grooves made in body, which, in its turn, is rigidly connected to auxiliary pipe via shear pin. Between stepped locking bushing and saddle compression spring is placed. Fixing elements of collar compactors are made in form of comb with inner teeth and outer conic generators in nose portion. On the side of collar compactors these are enveloped by inner conic portion of compression bushing, in its turn rigidly connected to upper conic bushing, and on the other side combs with inner teeth are placed sliding-moveably in radial grooves of guiding bushing placed between ends of upper conic bushing and inner conic portion of compression bushing with possible engagement by inner teeth of comb to slanting walls of body groove and interaction to all elements of this assembly.
EFFECT: higher reliability.