Pressure testing device to determine well string fluid influx in well string

FIELD: oil and gas industry, particularly pressure testing equipment adapted to determine fluid influx in well string during well repair, isolation and survey.

SUBSTANCE: device comprises hollow body with radial channels, sealing member with upper and lower flanges, sliding bush, cone with slips and electric drive. The electric drive is arranged inside the body and includes screw couple, pusher and control-rod. The control rod has destructible split pin and washer. The device also has pump, through orifices made in rod, pressure transducer and double-sided packer provided with independent manometer located under the packer. Pressure transducer has electric circuit adapted to transmit information to control panel.

EFFECT: increased efficiency of determination of well string connection air-tightness during hydrostatic pressure reduction.

4 dwg

 

The invention relates to the field of oil and gas industry and can be used to create devices for pressure testing casing for the flow of fluid in repair, insulation and research.

Known packer, consisting of a body with an axial channel of the sealing element with top and bottom stops, tapered sleeves with slipcase and spring hollow Radome, which houses the cylinder to atmospheric pressure, the elastic element separated by a partition with a valve in the form of a diaphragm [USSR Author's certificate No. 1112114, CL E 21 33/12, publ. 1984].

When using this packer is difficult to guess the interval of his landing as he descends into the well under its own weight in free-fall. Removing this packer is difficult, it is necessary to lower the device into the well, zalovalsya and retrieve the packer. The failure of the packer is due to the force of elasticity of the sealing element. Sealing elements used on the packers, for 1.5-2 hours after landing pressure of 15-20 MPa lose their elastic properties, which casts doubt on the possibility of retrieval of the packer, the packer is necessary to drill because of high material costs. This packer is not provided the site for the collapse of the packer. It can not be used for megatr is based landing without removal of the surface, where it is necessary to carry out preparatory work.

Known packer, the descent on the rope, consisting of a body, a sealing element, plunger, cone, sleeve, upper and lower zakurivaya nodes and valve [USSR Author's certificate No. 775291, CL E 21 33/12, publ. 1980].

The disadvantages of this packer is the intensity of the breakdown and removal from the well, the complexity of the design - some sealed eight mobile connections, which reduces its reliability.

Known packer Electromechanical cable-rope, consisting of a hollow casing with radial channels installed on the body of the sealing element with upper and lower flanges and the follower cone to host slipcase installed in the body cavity of the trunk, forming with the body of the circulation channel, reporting through the radial channels of the housing space behind, above and below the sealing element and is installed with the possibility of overlap of the circulation channel after sealing of the well and the drive is installed above the sealing element and connected to the housing and barrel [US Patent No. 3542126, E 21 In 43/00, publ. 1970].

Known packer does not provide reliability when multiple landing and breaking, as well as the integrity of the wellbore.

Closest to the proposed image is the shadow on the technical nature of a device for interval pressurization of the column on the cable-rope, consisting of a hollow casing with radial channels, the sealing element with upper and lower flanges, a movable sleeve, a cone with slipcase, drive located in the housing having a screw pair, Cam, thrust, while the rod is further provided with a washer, destructible locking pin and a projection serving as a stop.

As a result of use of the device ensures reliable sealing of the wellbore with multiple landing and the possibility of recovery in case of emergency failure of the drive. However, the known device cannot determine the tightness of the threaded connection of the column to the flow of fluid into the well at reducing hydrostatic pressure in it.

In the proposed device solves the problem of providing for the determination of the tightness of the threaded connection casing for the flow of fluid into the well at lower hydrostatic pressure.

The task is solved in that the device for pressure testing casing for the flow of a liquid, comprising a hollow body with radial channels, the sealing element with upper and lower flanges, a movable sleeve, a cone with slipcase, both located in the housing with a screw pair, plunger, rod, equipped with destructible cotter pin and washer according to the invention is equipped with a pump, through channels on the rod,a pressure sensor, mounted on the rod with the circuit, transmitting information to the remote control, and two-way manifold with independent pressure gauge under the packer.

The invention

Figure 1 and 2 presents the proposed device for pressure testing casing for the flow of a liquid.

The unit consists (see figure 1) from a special packer and packer raczepluschee B that share a hole on the cavity I, II and III. A special packer And consisting of a hollow body 1 with holes 2, provided with a motor 3, a gear 4, a pump 5 for pumping fluid, a screw pair - nut 6 and the screw 7, the Central shaft 8, parts of which have channel 9 for messages suction line of the pump 5 with podplacenym space II, the pressure sensor 10, the transmitting electronic circuit through wires 11 information on the Delta control panel 12, the sealing ring 13. The sleeve 14 is located in the hollow body 1, made of rubber cuff 15 mounted on the outer surface of the hollow body 1, limited by two flanges 16 and 17. The flange 17 is movable and fixed on the movable sleeve 18, in addition, the device contains a cone 19, slips 20, movably located on the cone 19, the plunger 21 mounted on the Central shaft 8 through the shear washer 22 and nut 23, the limit switches 24 and 25 located inside the hollow body 1, the contactor 26, the location is defined on the screw 7, the cable 27, which as a supporting element of the special packer a and the element supplying an electric current mechanisms, flow line 28, pump 5.

Attaleia packer B consists of two buildings 29 and 30, which are located opposite to each other, the rod 31 with the control pressure gauge 32 Autonomous action, mounted in the lower part of the stem 31 is provided with a cavity I, clipsof 33 and 34, adjustably located on the housings 29 and 30, the rubber cuffs 35, the fixed flange 36, the fixing unit of the packer 37, capture and ocalenia 38.

The device operates as follows.

Assembled according to figure 2, the packer bilateral actions And descends into the well by boarding device and sits above the roof of the reservoir (see Fig 3), with rubber sleeve 35 is deformed and overlaps the wellbore, dies 33 and 34 are nominated by the cones 29 and 30, are fixed on the walls of the column, depth gauge 32 measures the pressure in the cavity I, in communication with the borehole bottom.

Next, using geophysical lift the PCB and 3.5 on the cable 27 descends into the well a special packer And to the range of 500-800 m higher than the lower packer bilateral actions and planted. To do this, the cable 27 is supplied electric current to the electric motor 3, the torque is transmitted through the reduction gear on the screw pair - nut 6, screw 7, and the rod 8 sootvetstvenno is moved upward with the plunger 21, who puts the die 20 in the radial direction, they rest on the wall of the column, then the housing 1 together with a fixed flange is moved down relative to the rolling of the pipe 18 and the rolling of the flange 17, the rubber sleeve is deformed, increases in cross-section and overlaps the annular space between the casing and the casing 1, simultaneously with the upward movement of the rod sealing fingers 13 go into the plug - saddle 14 and tightly sit on it, thus preventing the flow of fluid in the internal cavity of the packer, the contactor 26 touches the limit switch 25 and disables the motor 3. The process of planting packer And is controlled from the remote control 12. The pressure sensor 10 located below the packer And passes through the conductor 11 and the cable 27 to the control unit of the hydrostatic pressure in the cavity II, on the remote control are shown in real time the amount of hydrostatic pressure and are recorded under the computer. Then turn off the pump 5, through which the channel 9 takes the fluid from the cavity II and throws in nadakarni cavity III through discharge line 28. As pumping fluid from the cavity II in the cavity III, the hydrostatic pressure in the cavity II will be reduced, which will show the pressure sensor 10 on the remote control (see figure 3).

When the reduction of hydrostatic pressure on the elicina 5-6 MPa pump off. This pump eliminates the flow of fluid from the cavity III in the cavity II (in the opposite direction).

If the hydrostatic pressure in the cavity II is restored, which can be seen on the remote control, then the column at the given interval tight that will be reflected in the graph according to figure 3 - column sealed in the interval H1-N2since the hydrostatic pressure in the cavity II is not recovered.

If the hydrostatic pressure in the cavity II will be restored, then the column in this interval is not sealed, that will be reflected in the graph according to figure 4 - column not sealed in the interval N1-N2since the hydrostatic pressure in the cavity II was restored.

To clarify interval disorders (depth) spec. packer And goes even further and is pumping fluid between the two packers (cavity II), as described above, the expected recovery time of hydrostatic pressure, if the pressure is restored, then the violation is higher than spec. packer And because megaporno planting and reducing the pressure between the two packers, is determined by the spacing violations (depth) with an accuracy of ±1 meter.

The intensity of the flow of fluid is determined by the recovery time of the hydrostatic pressure and the volume rolled back fluid from the cavity A. the Volume of the evacuated fluid is determined by the capacity of the pump.

<> If the flow of fluid is negligible, which is consistent with the requirements of normative documents, the column sealed recognized, and if the flow of fluid above the permissible limits, the convoy is recognized not sealed.

Thus, using the proposed device solves the problem of providing for the determination of the tightness of the casing for the flow of fluid into the well at lower hydrostatic pressure.

Application of the proposed device will determine the tightness of the casing.

A device for pressure testing casing for the flow of a liquid, comprising a hollow body with radial channels, the sealing element with upper and lower flanges, a movable sleeve, a cone with slipcase, both located in the housing with a screw pair, plunger, rod, equipped with destructible cotter pin and washer, characterized in that it is equipped with a pump, through channels on the rod, a pressure sensor, mounted on the rod with the circuit, transmitting information to the remote control, and two-way manifold with independent pressure gauge under the packer.



 

Same patents:

FIELD: mining, particularly devices for periodical production string interval pressure-testing inside well.

SUBSTANCE: device comprises pressure-testing valve to be lowered in pipe string. The valve has body, head for fishing tool receiving connected to valve body, anchoring unit with a number of driving retainers made as levers and sealing unit with compactor. Shoe made as tubular section is installed at lower end of pipe string to be pressure-tested. The tubular section defines length-limited inner annular space having diameter exceeding inner diameter of pipe string to be pressure-tested. Compactor is arranged between lower fixed and upper movable valve body parts. The lower and upper valve body parts are mutually spring-loaded and provided with outer facets. Anchoring unit includes upper and lower anchoring members serially arranged in lower fixed valve body part. Each anchoring member is provided with individual drive made as wedge with spring and is made as a pair of cooperating double-armed driving levers installed on common hinge and provided with lower anchoring ends. The lower anchoring ends correspondingly engage pipe string joint and the shoe.

EFFECT: simplified structure and increased operational reliability.

5 dwg

Packer // 2284406

FIELD: oil and gas industry, particularly packers combined with double-acting anchor.

SUBSTANCE: packer comprises rod with radial extension, sealing member connected to rod, as well as upper cone and upper friction blocks. Arranged under the sealing member are lower cone, lower friction blocks, fixer and spring-loaded slats. Located over sealing member are upper pusher, hydraulic damping system and shear pins. The shear pins are inserted in upper pusher body. Upper cone is fixedly fastened to pipe string and to upper rod end. Lower pusher and controllable compression spring brought into contact with lower pusher, are installed under the sealing member. Fixer is made as retaining ball, which is located simultaneously in horizontal slot and in pusher body depression before packer putting in operation. The horizontal slot is made in connection pipe slidably installed on rod. After pusher bringing in operation the ball is located in vertical slot of connection pipe. All packer components are put in operation under the action of compression spring.

EFFECT: increased efficiency of device operation in wells characterized by different geological-technical conditions due to simplified device structure.

2 cl, 3 dwg

FIELD: oil and gas industry, particularly well cementing means, for instance secondary well cementing under pressure for well repair, for separation bridge installation in well in predetermined intervals and for other well isolation works performing.

SUBSTANCE: device comprises hollow shaft with hydraulic cylinder fastened in upper device part, radial orifices in lower part thereof and shoe located under the orifices. Sealing unit with support members and cones located on outer shaft surface is also provided. Device comprises lower jaw for device fastening on well wall, hydraulic drive to bring lower jaw in working position, which is combined with isolation solution supply unit adapted to inject isolation solution in well. The unit is made as lower and upper seats arranged inside shoe or shaft below radial orifices. The seat is adapted for free fall elastic member receiving and is located in annular gap between the shoe and outer surface of annular piston shaft. Working space of the piston is connected to shaft interior through radial orifices. Sealing unit deformation assembly is connected with mechanical drive, which brings upper jaw in working position to provide additional device fastening to well wall. The mechanical drive is made as installation unit having clutch in upper unit part. One clutch end is adapted to be connected to pipes for device lowering in well. Another clutch end is fixedly fastened to connection pipe and to nipple made as hollow piston. The nipple and hollow piston define annular gap for hydraulic cylinder installation. Connection pipe is installed outside of hydraulic cylinder and is connected with it by shear members to provide deformation force transmission from pipes to sealing unit for device lowering in well in working device position. Nipple-piston is located in hydraulic cylinder and has length, which differs from connection pipe length for not more than 20%.

EFFECT: increased operational reliability and simplified device structure.

6 cl, 1 dwg

FIELD: oil production, particularly sealing or packing boreholes or wells.

SUBSTANCE: device comprises two packers having the same structure and pressure relief valve installed in-between. The relief valve is adapted for excessive pressure discharge into annuity between the device and casing pipe. Spring-loaded disc valve is installed over upper packer. The disc valve is used for flow string pressure-testing. Overflow valve for liquid drainage from tubing string is installed over the disc valve. The overflow valve is provided with shutoff member, which may be dropped inside the device before device lifting from well. Check valve is arranged in lower part of the device.

EFFECT: possibility of rising pipe pressure-testing and increased packer and separate packer components air-tightness.

2 cl, 2 dwg

Packer // 2283420

FIELD: oil production industry, particularly for temporary productive reservoir isolation during well repair and to isolate lower reservoirs when passing from lower reservoirs to upper ones.

SUBSTANCE: packer comprises hollow bore with plug and rest, as well as fixer made as shear member. The plug is installed in hollow bore top. The rest may slide upwards relatively hollow bore and is provided with cone and stem located at rest bottom. Sealing member is arranged over the rest. Expanding cone fixedly connected with lower end of hollow bore is installed over the rest. Anchoring unit is located over the expanding cone. The anchoring unit is made as hollow insert with dies spring-loaded inwards. The dies are made as pistons installed in anchoring unit so that the dies may slide outwards. Hollow bore interior communicates with ambient space below sealing member through the stem. Outer stem surface is provided with groove and removable case with position regulator made as finger, which cooperates with above groove. The groove includes short and long sections connected with each other so that when stem performed axial displacement relatively removable case finger alternately passes into short and long groove sections. In transport position the finger is located in short groove section, in working position the finger passes in long groove section. The removable case is provided with spring centrators and spring plates connected to slips, which may cooperate with cone in working positions. In transport position the rest is fixed relatively hollow bore with shear screw. The locating fixer connects driving body made as connection pipe, with upper part of hollow bore.

EFFECT: elimination of work repetition and premature works for packer unsealing and decreased additional costs.

3 dwg

Packer // 2283419

FIELD: oil production industry, particularly for temporary productive reservoir isolation during well repair and to isolate lower reservoirs when passing from lower reservoirs to upper ones.

SUBSTANCE: packer comprises hollow bore with plug and rest, as well as fixer made as shear member. Locating fixer connects driving body made as connection pipe, with upper part of hollow bore. The plug is installed in hollow bore top. The rest may slide upwards relatively hollow bore and is provided with stem, which may cooperate with well bottom. In transport position the rest is fixed relatively hollow bore with shear screw. Sealing member and cone fixedly connected with lower end of hollow bore are arranged over the rest. In working position the cone cooperates with the rest. Sealing member position regulator is arranged in the hollow bore. The position regulator is made as hollow insert installed in hollow bore and arranged over the cone. The position regulator has slips spring-loaded inwards. The slips are made as pistons, which may perform radial movement outwards under the action of excessive internal pressure in the bore interior, which communicates with ambient space below sealing member through the stem.

EFFECT: elimination of work repetition and premature works for packer unsealing and decreased additional costs.

2 dwg

Casing packer // 2282711

FIELD: mining, particularly casing pipe cementing inside well bore.

SUBSTANCE: packer comprises cylindrical body with central axial and inlet channels. Figured bush is fixedly fastened to one end of the body. The bush is provided with inner annular turning. Inlet channel from inner cylindrical body side is closed with shear plug installed in the channel and with check valve. Longitudinally corrugated shell composed of separate end and central sections is installed outside the body. The sections are connected with each other by means of reducing bushes. One end section of the shell is fixedly fastened to outer body surface. Reducing bushes are concentrically arranged along body length from outer body side and may perform axial movement relatively the body. Inner surface of reducing bush sections of the shell and outer body surface create hydraulic chamber communicated with central axial channel of the body through inlet valve. Sealing member with sealed inner cavity is arranged outside central shell section. The inner cavity is filled with plastic substance, for instance with raw rubber, sealant or mixture including hardening tar with liquid hardening agent contained in breakable capsules.

EFFECT: increased reliability of casing annulus packing due to elimination of cross-feed during cementing operation.

3 cl, 3 dwg

FIELD: oil production industry, particularly bore isolation means.

SUBSTANCE: device comprises packer having through body and elastic collar, as well as isolation means having bore with radial channels and inner cylindrical recess, slide installed in bore and provided with two rows of radial channels separated one from another with transversal solid partition. The device also comprises bush installed inside the slide and having ball seat. The ball is dropped inside the device before the second formation treatment. Upper row of radial channels of the slide is in front of radial channels of the bore. Bore, slide and bush are connected with each other by differential shear members. Before the second formation treatment upper and lower rows of radial slide channels are communicated with each other by means of inner cylindrical recess formed in the bore to provide hydraulic communication between tubing string interior and packer interior. Device also has additional packer located over isolation means and spaced a distance exceeding upper formation thickness from the packer. Additional packer comprises upper rest with cylindrical narrowed part, lower rest and additional elastic collar arranged on the narrowed part. Upper rest is movably installed so that the upper rest may slide into lower rest in axial direction. The upper rest is fixed into lower rest by means of shear member. Lower rest may cooperate with additional elastic collar. Upper rest is provided with hydraulic anchors compressed inwards and cooperating with casing pipe having increased pressure created in tubing string interior.

EFFECT: elimination of additional operation for casing pipe shutoff over upper formation.

3 dwg

FIELD: oil and gas production industry, particularly devices to isolate reservoirs in well during segregated injection of different reagents in reservoirs.

SUBSTANCE: device comprises packer including through body and elastic collar, isolation means including shaft with radial channels and inner cylindrical groove, slide with radial channels grouped in two rows and divided with transversal solid partition. The slide is installed in shaft and adapted to receive bush with ball seat to support ball to be dropped into the device before second reservoir treatment. Upper row of radial channels is in front of radial channels of the shaft. The shaft, the slide and the bush are connected with each other by differential shear members. Before the second reservoir treatment upper and lower rows of radial slide channels are communicated with each other by the inner cylindrical groove to establish hydraulic communication between flow string interior and packer body interior. The device is also provided with additional packer spaced a distance exceeding upper reservoir thickness from main packer. Additional packer comprises cylinder located from additional packer top and additional elastic collar installed on hollow base connected to isolation means by clutch and cylinder fixed to flow string. Piston is fixedly secured to hollow base top. Piston is slidably installed in the cylinder so that the piston may be axially displaced in upward direction to define cavity along with the cylinder. The cavity is communicated with flow string interior. The cylinder may cooperate with additional elastic collar.

EFFECT: elimination of additional casing pipe cutoff over upper reservoir.

3 dwg

FIELD: well building and operation equipment, particularly to perform cased well testing, for instance during pressurizing thereof.

SUBSTANCE: device comprises body with power shaft adapted to receive fixing rams and rubber sealing member tightened with bearing sleeve having nut, as well as electromechanical drive of power shaft made as electric drive and planetary reduction gear. Device also has power shaft movement detecting sensor and pressure sensors connected with control panel. Planetary reduction gear comprises four stages and is provided with torque-limiting clutch arranged between the second and the third stages. Outer gear wheel of the first, the second and the forth planetary reduction gear stages is fixed in the body. Outer gear wheel of the third stage is loosely installed. Power shaft has guidescrew and nut connected to the forth reduction gear stage. Sliding rams are installed on intermediate support, which is spring-loaded relatively the body and bearing sleeve. Partition is installed in lower body part. Power shaft may be fixed relatively the partition by means of dowel. Shaft movement detecting sensor is arranged in chamber defined by the partition and body walls. The first pressure sensor communicated with over-the-packer area is installed in lower body part. The second pressure sensor communicated with under-the-packer area is arranged in axial channel made in power shaft to communicate thereof with well medium. The body may be filled with oil and provided with hydrostatic pressure compensator. Corresponding extensions may be formed on replaceable ends of outer gear wheels of the third and the forth planetary reduction gear stages. Movement detecting sensor may be connected to power shaft by movable contact means and electrically linked to control panel. Intermediate support may have inclined guiding means to guide sliding rams, which are spaced along a circle so that 120° angles are defined in-between. Upper sliding rams are offset 60° from lower ones along a circle. Outer surfaces of lower body end and bearing sleeve extend at an angle to instrument axis normal. The angle is equal to angle of intermediate support guiding means inclination to instrument axis and is not less than 6°. Space between bearing sleeve and shaft may be sealed with sealing ring. Axial channel in lower part of power shaft may be connected with radial hydraulic channel communicated with over-the-packer area. Method for packer installation involves lowering packer to predetermined interval; pushing out fixing rams and compressing sealing member of the packer with the use of electromechanical drive. Electromechanical drive comprises electric engine and power shaft kinematically connected with rams and sealing member. Packer installation is accompanied by recording of electric engine load current, power shaft movement amplitude and direction, as well as pressure in over-the-packer and under-the-packer areas. Above data are recorded as diagrams. Degree of sealing member compression is determined from electric engine load current change. Packer air-tightness can be inferred by pressure drop value.

EFFECT: increased efficiency of packer installation control, reduced accident risk.

9 cl, 7 dwg

FIELD: mining, particularly devices for periodical production string interval pressure-testing inside well.

SUBSTANCE: device comprises pressure-testing valve to be lowered in pipe string. The valve has body, head for fishing tool receiving connected to valve body, anchoring unit with a number of driving retainers made as levers and sealing unit with compactor. Shoe made as tubular section is installed at lower end of pipe string to be pressure-tested. The tubular section defines length-limited inner annular space having diameter exceeding inner diameter of pipe string to be pressure-tested. Compactor is arranged between lower fixed and upper movable valve body parts. The lower and upper valve body parts are mutually spring-loaded and provided with outer facets. Anchoring unit includes upper and lower anchoring members serially arranged in lower fixed valve body part. Each anchoring member is provided with individual drive made as wedge with spring and is made as a pair of cooperating double-armed driving levers installed on common hinge and provided with lower anchoring ends. The lower anchoring ends correspondingly engage pipe string joint and the shoe.

EFFECT: simplified structure and increased operational reliability.

5 dwg

Packer // 2284406

FIELD: oil and gas industry, particularly packers combined with double-acting anchor.

SUBSTANCE: packer comprises rod with radial extension, sealing member connected to rod, as well as upper cone and upper friction blocks. Arranged under the sealing member are lower cone, lower friction blocks, fixer and spring-loaded slats. Located over sealing member are upper pusher, hydraulic damping system and shear pins. The shear pins are inserted in upper pusher body. Upper cone is fixedly fastened to pipe string and to upper rod end. Lower pusher and controllable compression spring brought into contact with lower pusher, are installed under the sealing member. Fixer is made as retaining ball, which is located simultaneously in horizontal slot and in pusher body depression before packer putting in operation. The horizontal slot is made in connection pipe slidably installed on rod. After pusher bringing in operation the ball is located in vertical slot of connection pipe. All packer components are put in operation under the action of compression spring.

EFFECT: increased efficiency of device operation in wells characterized by different geological-technical conditions due to simplified device structure.

2 cl, 3 dwg

FIELD: oil production industry, particularly for casing pipe cementing.

SUBSTANCE: clutch comprises body with cementing orifices, bush-like shell arranged outside the body and defining annular cavity along with the body, as well as additional bush installed in the cavity. The body is provided with channels, which communicate annular cavity with body. The clutch has support bush, tail and adapter. Bush-like shell is rigidly connected to the body. Additional bush has channels communicating body interior with well annulus through cementing orifices. The clutch has gate installed in the body and connected to support bush. The clutch is also provided with tail to be installed inside the body and connected with the adapter. Check valve is installed in lower adapted part under transversal partition with longitudinal orifices. Channels, which communicate adapter interior with tubing-casing space, are created over the partition. Bush is slidably installed on adapter and is provided with spring retaining ring. Upper adapter part is connected with clutch with longitudinal ribs and has annular groove for spring retaining ring receiving, which is formed on outer surface thereof.

EFFECT: simplified structure, reduced metal consumption, increased productivity and cementing quality.

1 dwg

Well killing method // 2283942

FIELD: oil and gas industry, particularly for well killing.

SUBSTANCE: method involves arranging isolation cement bridge in casing pipe over productive horizon; communicating casing string-borehole space with string space through technological opening located within the boundaries of high-plastic covering rock interval; arranging additional isolation cement bridge; forming artificial covering and water-tight isolation screen system. Additional cement bridge roof is 2-10 m below lower technological opening end. After casing string-borehole space communication with string space artificial isolation covering is created of material, which has composition as close as possible to that of rock located within interval of artificial isolation covering communication with string space. String space part defined by cement bridges is filled with viscoplastic material having density, which is 1.0-1.2 times greater than that of fluid-tight rock penetrated by well.

EFFECT: increased fluid-tightness of artificial covering and water-tight isolation screen system.

6 cl, 2 dwg, 1 ex, 4 tbl

FIELD: oil and gas industry, particularly well cementing means, for instance secondary well cementing under pressure for well repair, for separation bridge installation in well in predetermined intervals and for other well isolation works performing.

SUBSTANCE: device comprises hollow shaft with hydraulic cylinder fastened in upper device part, radial orifices in lower part thereof and shoe located under the orifices. Sealing unit with support members and cones located on outer shaft surface is also provided. Device comprises lower jaw for device fastening on well wall, hydraulic drive to bring lower jaw in working position, which is combined with isolation solution supply unit adapted to inject isolation solution in well. The unit is made as lower and upper seats arranged inside shoe or shaft below radial orifices. The seat is adapted for free fall elastic member receiving and is located in annular gap between the shoe and outer surface of annular piston shaft. Working space of the piston is connected to shaft interior through radial orifices. Sealing unit deformation assembly is connected with mechanical drive, which brings upper jaw in working position to provide additional device fastening to well wall. The mechanical drive is made as installation unit having clutch in upper unit part. One clutch end is adapted to be connected to pipes for device lowering in well. Another clutch end is fixedly fastened to connection pipe and to nipple made as hollow piston. The nipple and hollow piston define annular gap for hydraulic cylinder installation. Connection pipe is installed outside of hydraulic cylinder and is connected with it by shear members to provide deformation force transmission from pipes to sealing unit for device lowering in well in working device position. Nipple-piston is located in hydraulic cylinder and has length, which differs from connection pipe length for not more than 20%.

EFFECT: increased operational reliability and simplified device structure.

6 cl, 1 dwg

FIELD: oil and gas industry, particularly well cementing means, for instance secondary well cementing under pressure for well repair, for separation bridge installation in well in predetermined intervals and for other well isolation works performing.

SUBSTANCE: device comprises hollow shaft with hydraulic cylinder fastened in upper device part, radial orifices in lower part thereof and shoe located under the orifices. Sealing unit with support members and cones located on outer shaft surface is also provided. Device comprises lower jaw for device fastening on well wall, hydraulic drive to bring lower jaw in working position, which is combined with isolation solution supply unit adapted to inject isolation solution in well. The unit is made as lower and upper seats arranged inside shoe or shaft below radial orifices. The seat is adapted for free fall elastic member receiving and is located in annular gap between the shoe and outer surface of annular piston shaft. Working space of the piston is connected to shaft interior through radial orifices. Sealing unit deformation assembly is connected with mechanical drive, which brings upper jaw in working position to provide additional device fastening to well wall. The mechanical drive is made as installation unit having clutch in upper unit part. One clutch end is adapted to be connected to pipes for device lowering in well. Another clutch end is fixedly fastened to connection pipe and to nipple made as hollow piston. The nipple and hollow piston define annular gap for hydraulic cylinder installation. Connection pipe is installed outside of hydraulic cylinder and is connected with it by shear members to provide deformation force transmission from pipes to sealing unit for device lowering in well in working device position. Nipple-piston is located in hydraulic cylinder and has length, which differs from connection pipe length for not more than 20%.

EFFECT: increased operational reliability and simplified device structure.

6 cl, 1 dwg

FIELD: oil production, particularly sealing or packing boreholes or wells.

SUBSTANCE: device comprises two packers having the same structure and pressure relief valve installed in-between. The relief valve is adapted for excessive pressure discharge into annuity between the device and casing pipe. Spring-loaded disc valve is installed over upper packer. The disc valve is used for flow string pressure-testing. Overflow valve for liquid drainage from tubing string is installed over the disc valve. The overflow valve is provided with shutoff member, which may be dropped inside the device before device lifting from well. Check valve is arranged in lower part of the device.

EFFECT: possibility of rising pipe pressure-testing and increased packer and separate packer components air-tightness.

2 cl, 2 dwg

FIELD: oil production, particularly sealing or packing boreholes or wells.

SUBSTANCE: device comprises two packers having the same structure and pressure relief valve installed in-between. The relief valve is adapted for excessive pressure discharge into annuity between the device and casing pipe. Spring-loaded disc valve is installed over upper packer. The disc valve is used for flow string pressure-testing. Overflow valve for liquid drainage from tubing string is installed over the disc valve. The overflow valve is provided with shutoff member, which may be dropped inside the device before device lifting from well. Check valve is arranged in lower part of the device.

EFFECT: possibility of rising pipe pressure-testing and increased packer and separate packer components air-tightness.

2 cl, 2 dwg

FIELD: oil production, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: method involves injecting polyacrylmide suspended in organic liquid in reservoir and forcing thereof in reservoir with water. The polyacrylmide is anionic polyacrylmide. Solid polyacrylmide is previously treated with 0.3-10 Mrad dose of accelerated electrons. Polyacrylmide concentration in organic liquid is 5-50%. After above suspension forcing 10-60% urethane prepolymer solved in acetone is additionally injected and forced with water in reservoir.

EFFECT: increased water and behind-the-casing flow isolation time.

3 ex

FIELD: oil production, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: method involves injecting composition containing polyacrylmide, sodium silicate and water in reservoir through well. Solid polyacrylmide is previously treated with 0.3-10 Mrad dose of accelerated electrons. The composition contains 5-15% of polyacrylmide suspended in aqueous sodium silicate solution having density of 1.2-1.5 g/cm3. After above suspension injection water composition is additionally injected in reservoir. The water composition contains soluble calcium or magnesium or aluminum or ammonium salt taken in amount of 3-30% by weight, above polyacrylmide taken in amount of 0.2-2% by weight, remainder is water.

EFFECT: EFFECT: increased water and behind-the-casing flow isolation time.

3 ex

Mouth equipment // 2244097

FIELD: oil and gas extractive industry.

SUBSTANCE: equipment has body in form of upper and lower portions, pipes turning mechanism, splashes deflector having conical shape, wiper with aperture, liquid flow deflector in form of cone. Blocks of wedges are mad with possible forming of through channel between them and with body for draining liquid to well. Equipment performs hoisting operations with tubing and drilling pipes. Cone is placed in lower portion of body. Liquid flow is focused towards center and along outer wall of tubing column through wiper aperture into well.

EFFECT: prevented pollution, higher productiveness.

2 dwg

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