Method for generation of draw-down pressure in order to conduct borehole investigations

FIELD: oil and gas industry.

SUBSTANCE: method includes simulating of formation and recording of data on borehole processes by a geophysical instrument run-in into the tubing string at a logging cable and self-contained instruments installed at the lower end of the tubing string. At that simulation of formation is made by breaking a breakable drain valve made of a brittle material of hemisphere shape and installed with a convex part downwards in the lower part of the tubing string; for this purpose a drill stem is fixed under the geophysical instrument and the geophysical instrument is run-in with the stem into the interval with speed sufficient to break the breakable drain valve. At that upper part of the tubing sting above the breakable drain valve is not filled with water and a packer is installed in tubular annulus at the level of the tubing string lower part.

EFFECT: increase of information content and reliability for borehole investigations; reduction of labour intensity, time consumption and equipment costs; possibility to use in wells with any producibility of the investigated formation.

1 dwg

 

The invention relates to the field of geophysical research in oil and gas wells and can be used to obtain information about the downhole processes (the profile of the inflow from the reservoir recovery curve level (CEF), vodonagrevatel, formation pressure, and others) after creating a depression on the layer.

Known to create a depression on the formation swabbing (see, for example, Jafarov SURDS Piston tartane // Oil industry. 1995. No. 5-6), including the influence on the formation by the reciprocating movement of the swab in the column tubing (tubing) and the displacement of fluid through the tubing string at the wellhead. After removing the swab produce descent logging tool in the reservoir interval and record downhole information.

The disadvantage of this method is the complexity, the duration of the process of creating a depression (not less than six hours), the need to use specially prepared for swabbing tubing and lift. For conducting borehole studies, this method is ineffective because the geophysical instrument lowered into the well after removing the swab, i.e. after a long time (at least two hours).

Known to create a depression in the reservoir using a compressor units (see, for example, Ngered, Wmmarpes. the very foundations of the oil and gas industry. M.: Nedra, 1980), which was adopted as the closest analogue to the proposed invention. This method includes the influence on the formation by the compressed air in the annular space and the displacement of fluid through the tubing string at the wellhead. Geophysical instruments lowered into the tubing string for conducting research before starting the operation of the compressor installation.

The known method is time-consuming and costly, as it requires the use of expensive compressors, advanced technical training well, the use of inert gas. Compressing is not possible to create a deep depression in the reservoir, which reduces the information content of the borehole research. Certain restrictions on the use of the method is the inability to lower the liquid level using compressione in wells with a large reservoir productivity, as well as the requirement to ensure the tightness of the upper part of the casing or wellhead equipment.

The technical result achieved when using the proposed invention is to increase the information content and reliability of the borehole research, reducing the complexity, time and equipment, can be used in wells with any value productivity of the investigated p the Acta.

This technical result is achieved in that in the method of creating a depression in the reservoir for conducting borehole research, including the stimulation and recording information about downhole geophysical processes device, spokeman into the tubing string on a logging cable, and stand-alone instruments installed at the lower end of the casing, according to the invention, the stimulation is implemented by breaking whipped valve, made of fragile material in the shape of a hemisphere and is hermetically installed convex part down in the lower part of the casing, which under geophysical instrument fix the shock rod and lower the geophysical instrument with a shock rod in the interval of the reservoir with velocity sufficient to break whipped valve, while the upper part of the casing above the whipped valve, leave blank water, and in the annular space at the lower part of the tubing string set packer.

The influence on the formation by breaking fitted in the lower part of the casing whipped valve allows you to create a depression for a very short period of time (not more than one minute), while ensuring maximum depression on the layer.

Making whipped valve of fragile material in the shape of a hemisphere and install it you who alloy part down provides on the one hand, lightweight and complete destruction of whipped valve shock force, and, on the other hand, keeping whipped valve substantial static pressure in the well.

Tight installing whipped valve in the tubing string is required for uncoupling the bottom, filled with borehole fluid, and the upper part, which is lowered into the well without water or partially filled.

The fastening of the shock rod under geophysical instrument implements the destruction whipped valve, and the weight of the instrument with the purpose of his descent into the reservoir interval in terms of the oncoming fluid flow arising after breaking whipped valve.

The information content and reliability of the borehole research is provided by the geophysical delivery device in the interval of the reservoir almost immediately after creating a depression on the layer.

The fact that the column tubing is lowered into the hole, empty water or filled with a small amount of water, it helps smooth the filling fluid from the well after the break whipped valve and, thereby, the transience of the process of creating a depression.

Setting of the packer in the space between the production column and the column tubing at the lower part of the casing cuts off the liquid column, which increases the efficiency of the creation of the depot is ASCII.

Restrictions on the magnitude of the productivity studies of the formation of the proposed method is available, since the set of features of the invention enables the creation of a significant relative pressure difference between the bottomhole zone of the formation and casing tubing almost simultaneously.

The proposed method does not require the use of the compressor, on the borehole during the research there is no need to employ a team of well workover (red) and lift cattle. For implementing the method does not require the tightness of the upper part of the casing or wellhead equipment. Thus, significantly reduced labor costs, time and equipment.

Implementation of the proposed method is illustrated by a diagram, which shows the column tubing 1, installed in the production string 2. In the lower part of the casing 1 is hermetically installed whipped valve 3. Geophysical device 4 descends into the tubing 1 on a logging cable 5. To the bottom of the logging tool 4 on the interval logging cable hung shock rod 6, which is necessary to mitigate the impact on the logging device 4 when breaking whipped valve 3. In the annular space between the casing tubing 1 and the production column 2, a packer 7. To improve information the STI at the lower end of the casing 1 under the retainer 7 can be installed offline geophysical instruments 8 in a special container.

The proposed method is as follows. During installation of the casing 1 at the wellhead in the lower part of the casing 1 is sealed establish whipped valve 3. Material whipped valve (glass, porcelain or ceramics) select, based on the amount of depression on the layer that you want to create. Tubing above whipped valve 3, mount the blank with water, or, taking into account the value of the planned depression, partially filled with water.

The tubing 1 is lowered into the production casing 2 to the interval of the studied reservoir. To enhance the efficiency of the process the liquid column in the annular space between the casing tubing 1 and the production column 2 at the lower part of the casing 1 divide the packer 7. Before the descent of the casing 1 at its lower end to establish Autonomous geophysical instruments 8.

Into the tubing string 1 down on the logging cable 5 geophysical device 4, to the lower part of which is suspended shock rod 6. The weight of the shock rod 6 is determined based on the value of the planned depression; as a rule, it must be more than 20 kg, the Rate of descent of the geophysical cable 5 calculated from the condition of guaranteed break the shock rod 6 whipped valve 3, and taking into account the value of the planned depression on a layer. The average speed of the SPU is the AC cable is 6000 m/h.

After breaking whipped valve 3 eliminates the barrier between the bottomhole zone of the formation and casing tubing 1, and downhole fluid rushes up to the wellhead.

Geophysical device 4 continues to descend until they reach the desired depth, after which produce a record of the flow profile, KVU, vodonagrevatel, reservoir pressure. The obtained information is transmitted in real time to the surface by a geophysical cable 5.

The information recorded Autonomous devices 8, read after lifting the tubing string to the surface.

The way to create a depression in the reservoir for conducting borehole research, including the stimulation and recording information about downhole geophysical processes device, spokeman in the column tubing on the logging cable, and stand-alone instruments installed at the lower end of the column tubing, characterized in that the stimulation is implemented by breaking whipped valve, made of fragile material in the shape of a hemisphere and is hermetically installed convex part down at the bottom of the column tubing, which under geophysical instrument fix the shock rod and lower the geophysical instrument with a shock rod in the interval formation speed, eno is Noah to break whipped valve, the upper part of the column tubing above the whipped valve, leave blank water, and in the annular space at the lower part of the column tubing set packer.



 

Same patents:

FIELD: mining.

SUBSTANCE: retaining device (13) inserted into a central channel of a drilling string component. The channel has the first diameter on at least a part of the central section of the drilling string component, and the second diameter near the ends of the drilling string component. The second diameter is less than the first diameter. The retaining device (13) comprises a lengthy body (14), forming at least partially a jacket for a transfer line. The lengthy body (14) has transverse dimensions less than the second diameter. Multiple arc elements (15) are arranged along the lengthy body (14). Arc elements are separate from the lengthy body and are attached to it.

EFFECT: arc elements are elastically bending for provision of their displacement through the second diameter and have the largest chord that is more than the first diameter in free condition for creation of an opportunity of expansion in the first diameter after stretching via the second diameter.

3 cl, 9 dwg

FIELD: physics.

SUBSTANCE: electrodes are separately exposed to the impact of periodically accumulated potential energy of a spring, which is generated by rotating screw pairs and abrupt (impact) release of energy when screw interaction of crests of the screw pairs ceases. The apparatus for realising the method is a drive structure having an output shaft which actuates the screw pairs. During forward rotation, the screw pairs open centralisers and elastically press the electric leads to the wall of the well casing, apply periodic action on the electrodes that are rigidly connected to the electric leads. The electric leads are cut into the wall of the well casing. Impact action occurs when screw interaction between the screw and nut, which is pressed by a power spring, ceases.

EFFECT: improved electrical contact between electric leads and a casing column.

10 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes a ground part in the form of a ground-mounted unit of a telemetric system of an electric-centrifugal pump installation and a well part including signal transfer medium of a combined communication channel, a submersible unit of the telemetric system of the electric centrifugal pump installation, an interface unit, receiving and independent transmitting and control modules and a measuring loop. The latter includes several measuring probes arranged one after another and parallel connected via a cable communication line connected to the independent transmitting and control module. The receiving module together with the interface unit and the submersible unit of the telemetric system is attached to the base of the submersible electric motor of the electric centrifugal pump installation. Information from the measuring loop is received with the independent module. Communication between independent and receiving modules is performed by means of a wireless acoustic channel. Then, measuring information is transmitted through the submersible unit via the combined communication channel to the ground-mounted unit of the telemetric system.

EFFECT: improving reliability of the data transfer system owing to preventing cable damage situations of the measuring loop and improving the efficiency of the monitoring process owing to decreasing complexity of lowering and lifting operations at erection and removal and excluding cases of tubing seizure with a geophysical cable.

3 dwg

FIELD: physics.

SUBSTANCE: disclosed is a seal assembly for an electrical logging probe, having a cylindrical housing, a plurality of dielectric inserts placed in the housing, a plurality of annular electrodes coaxially placed in the housing between the dielectric inserts and touching the end faces of the dielectric inserts with their end faces, an insulating means placed on the cylindrical housing for electrical insulation of the plurality of annular electrodes from the housing. According to the invention, each of the plurality of annular electrodes and dielectric inserts in contact with the annular electrodes have bevel end faces. The bevel end faces of the electrodes are interfaced with the bevel end faces of the dielectric inserts that are in contact with them. The seal assembly has a means of generating a compression force and fixing, which is in contact with the end face of the dielectric insert, placed distally with respect to said dielectric insert which is in contact with the cylindrical housing.

EFFECT: high containment of electric equipment of the probe from the external medium of the well and improved probing data.

12 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of production and injection wells, pumping of displacement agent through injection wells and extraction of the product through production wells, drilling of additional wells, and development of residual oil-saturated intervals. According to the invention, in all newly drilled additional wells there determined are residual oil-saturated and flooded intervals prior to the well casing. For that purpose, one-stage determination of temperature field is performed throughout the length of the well in real time both at filling of the shaft with heated washing liquid or water and after it is filled using an optic-fibre system. In case of absorption of washing liquid or water, volume of their supply, which provides full filling of the well, is increased. After the well casing residual oil-saturated and/or water-saturated intervals are developed, and displacement agent is extracted and/or pumped.

EFFECT: increasing oil recovery owing to improving the accuracy of determination of intervals of arrangement of water-saturated and residual oil-saturated zones.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: electric motor of a submersible pump can be equipped with two rotary shafts, and namely an upper one that is more rotary and a lower one that is less rotary, which are controlled with one common or two different individual current supply cables and connected to the submersible pump and a shutoff element. Lower electric motor is provided with the less rotary shaft controlled with a common or an individual current supply cable. The shutoff element consists of an upper rotating bar and a lower movable bar, which are connected to each other by means of screw thread. The rotating bar is connected from above with the less rotary shaft through a spline square or a hexagon and installed in the housing with possibility of being rotated only on the axis to one and another sides. The movable bar is connected from below between two pass assemblies in the form of mounting seats or seats with a shutter installed in the housing with possibility of being moved only along the axis till tight closing of above and below located mounting seats to assure the possibility of both the control and cutout of the fluid flow of the corresponding formation.

EFFECT: improving reliability and efficiency of the plant.

2 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes control centre of electric-centrifugal pump to power transformer is connected and output of the transformer is connected by power circuits of submersible cable through input lead with submersible electric motor. In downhole part control unit is connected to power supply source by one input and to the first input/output of the amplifier by the other input/output. The second input/output of the amplifier together with input of power supply source is connected through a pressure-seal connector to independent signal circuit formed by transit insulated conductor laid between stator pack and housing of submersible electric motor connected at the other end through input lead with signal core of submersible cable. In surface part this core is connected to output of remote power supply and to the first input/output of transceiver which second input/output is connected to the first input/output of surface control unit and its second input/output is connected to input/output of the control centre of electric-centrifugal pump. The third output is connected to input of remote power source. The amplifier in downhole part and transceiver in surface part are designed to ensure half-duplex operation during data exchange as bidirectional network. Input lead assembly of submersible electric motor is made according to four-contact circuit. In the downhole part independent signal circuit can be prolonged for the purpose of connection to other equipment placed downstream of submersible centrifugal pump by means of this circuit transit through the downhole part of the system in order to arrange measurement and control of actuating mechanisms placed in other areas of the well space. The downhole control unit contains analogue and discreet measuring channels connected to the processor. Outputs of analogue pressure and temperature transducers and test signal shaper are connected to respective inputs of analogue multiplexor which output is connected to input of analogue-to-digital converter. Its second input/output is connected to the first input/output of the processor and the second input/output of the processor is connected to control input of multiplexor. Discreet measuring inputs are connected to vibration sensor and the third input/output is connected to the first input/output of the amplifier. Number of measured parameters is increased due to additional measuring channels and modification of the processor application software.

EFFECT: improvement of the device operational reliability and simplification of the device.

6 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: bore core is selected and examined, induction logging and induced gamma-ray logging or neutron-neutron logging is made and log curves are analysed for the roof of production tier. At that formations with apparent resistivity are identified with values less than 6-8 Ohm/m during induction logging and against values at curves of induced gamma-ray logging or neutron-neutron logging making less 85% and less than values of lower formations. Among these formations it is necessary to select strata without loamy lintels and strata of carbonate oil-filled formations and values of apparent resistivity not less than 15 Ohm/m against data of induction logging. Then sedimentary types for the selected formations is defined and if oil-saturated sandstone is present then conclusion is made about terrigenous origin of these formations. Then values are specified for porosity coefficient, permeability and oil-saturation coefficients and when lower limits for this region are exceeded the indentified formations will be referred to productive formations.

EFFECT: increase of operational efficiency during installation of the bottom-hole complex, improvement of level of detail and authenticity of GIS data for identification of geological rating for rock masses.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: down-hole testing and measuring complex includes earth control station with telemetric data system connected by a logging cable with submerged-type electric pump at the end of tubing string, system of measuring modules including sensors for recording of parameters (yield, pressure, temperature, moisture content) and driving machine for their delivery to horizontal section of a well connected by a logging cable that provides rigid mounting for the system of measuring modules and transfer of data to the control station. Logging cables of the system of measuring modules telemetric system unit are connected by cable connectors. Driving machine contains two walking modules connected electrically and further driven by electrical micro-drives and sequential movement of wedged supports. Installation of the down-hole testing and measuring complex is performed in two stages. At first system of measuring modules is lowered to a well by means of winch with survey cable connected by a cable connector with a logging cable of the system of measuring modules passing through a groove in the wall of an installation pipe mounted at the well surface at the end of tubing string and by the other butt end - to the deadman in which tube there is a movable logging cable. The system of measuring modules is lowered at first up to driving machine turning to a relatively horizontal section, then by means of the driving machine it is hold to the relatively horizontal section until cable connector seats in the deadman tube; the latter is lowered by means of the installation pipe to the preset depth and fixed on the well bore. Thereafter power supply is switched odd in the micro-drive, by means of the winch socket with the survey cable is disconnected from connector pin and the installation pipe is lifted to the surface. At the second stage submerged-type electric pump is lowered to the well with logging cable and socket of cable connector contact pair filled by liquid sealant which is by means of a centring skid connected to the logging cable for the system of measuring modules.

EFFECT: increase of operational efficiency during installation of the bottom-hole complex.

6 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: down-hole testing and measuring complex includes earth control station with telemetric data system connected by a logging cable with submerged-type electric pump at the end of tubing string, system of measuring modules including sensors for recording of parameters (yield, pressure, temperature, moisture content) and driving machine for their delivery to horizontal section of a well connected by a logging cable that provides rigid mounting for the system of measuring modules and transfer of data to the control station. Logging cables of the system of measuring modules telemetric system unit are connected by cable connectors. Driving machine contains two walking modules connected electrically and further driven by electrical micro-drives and sequential movement of wedged supports. Installation of the down-hole testing and measuring complex is performed in two stages. At first system of measuring modules is lowered to a well by means of winch with survey cable connected by a cable connector with a logging cable of the system of measuring modules passing through a groove in the wall of an installation pipe mounted at the well surface at the end of tubing string and by the other butt end - to the deadman in which tube there is a movable logging cable. The system of measuring modules is lowered at first up to driving machine turning to a relatively horizontal section, then by means of the driving machine it is hold to the relatively horizontal section until cable connector seats in the deadman tube; the latter is lowered by means of the installation pipe to the preset depth and fixed on the well bore. Thereafter power supply is switched odd in the micro-drive, by means of the winch socket with the survey cable is disconnected from connector pin and the installation pipe is lifted to the surface. At the second stage submerged-type electric pump is lowered to the well with logging cable and socket of cable connector contact pair filled by liquid sealant which is by means of a centring skid connected to the logging cable for the system of measuring modules.

EFFECT: increase of operational efficiency during installation of the bottom-hole complex.

6 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: there is a description of pipe string for well completion installed in position neighbouring to zone or zones where hydraulic fracturing (HF) is to be performed and inflow is to be obtained. In preferable version its peculiarity concludes in valves with sliding couplings allowing implementation of at least two configurations; wide opening and opening of channel with filtering material located in it. Valve unit may have three positions where a position of complete closing is added to two above mentioned positions. After run-in-hole operation valves may be set to position of wide opening in any order required for HF. After completion of HF valves may be either closed or set to filtering position in a differentiated way to get inflow from the zone subjected to HF in any required order. There are various methods for valves actuation described. Pipe string may be provided with telescopic forcers providing HF if it is required to do string cementing. According to alternative version pipe string run in uncased well is just provided with holes for HF liquid passing through and outer packers for provision of HF in any required order.

EFFECT: proving HF in separated zones of formation in required order.

40 cl, 33 dwg

FIELD: oil and gas industry.

SUBSTANCE: multiposition device for selective switching over of flow through packer spindle between opposite directions contains: packer with packer spindle and sealing element designed so that spindle is retained in underground location when sealing element is in seating position; housing of crossflow coupling including components moved relative to each other and adjusted for its selective attachment near upper part of mentioned retained independently packer spindle, at that housing of cross-flow coupling when it is attached near upper part of packer spindle is able to generate relative movement providing opening and closing of channel on housing of cross-flow coupling.

EFFECT: reducing total length of device, orientation of device with higher accuracy.

13 cl, 6 dwg

FIELD: oil and gas production.

SUBSTANCE: down-hole valve includes housing with channel going through it, ball with through hole installed with the possibility of turning at its axis without longitudinal movement so that through hole coincides and not coincides with the said channel. The said ball axis is installed with the possibility of selective longitudinal movement in relation to the housing not depending upon the said turning.

EFFECT: increase of valve operation reliability via reliable keeping of open and closed position.

13 cl, 9 dwg

FIELD: oil and gas industry.

SUBSTANCE: selective well completion device includes a tube slide valve installed on the tube, the body of which is connected to the section of casing string, which is located opposite the productive formation and equipped with holes. Slide valve is equipped with two ring-shaped stops by means of which it is connected to the catch from time to time. Catch includes cylindrical housing with spring-loaded extendable cams and conical brace with a drive, which are located in it, and is connected by means of mechanical draft to the ground lifting mechanism attached to the ground power supply and control unit. At that, the device also includes independent electrical power supply located in the catch housing and made in the form of electrical accumulator or a set of electric batteries, at least two reed relays, similar number of signaling devices - electric lamps and at least three concentrically ring-shaped constant magnets installed in the well, as well as two radio contact devices mutually connected by means of radio on air. One of radio contact devices is located on the catch and equipped with the antenna in the form of electroconductive mechanical draft and connected to the independent power supply, and the other one is located on the ground surface and is connected via control unit to the ground power supply. Mechanical draft is flexible and made in the form of electroconductive rope. Drive of the brace includes electric heater equipped with thermostat, the working member located within its coverage and having the effect of shape memory in the form of straight-line wire from titanium nicelide and reverse element of the working member which is balanced and made in the form of a brace, and electric heat-insulating housing. At that, through the radio contact device fixed in the catch, the heater and each reed relay is separately connected to independent power supply, and by means of both radio contact devices the heater through the control unit and each reed relay separately through the control unit and one of the lamps are connected to the ground power supply.

EFFECT: enlarging functional capabilities of the device.

3 cl, 1 dwg

Downhole tool // 2304212

FIELD: oil production, particularly devices operating inside wells, for instance for circulation valve opening and closing, as well as for packer seating or removal.

SUBSTANCE: downhole tool comprises rod provided with member made as hollow sphere truncated from top and bottom and shaped as upturned cup. The cup bottom has facet extending along outer diameter thereof. Fishing head is arranged on sphere bottom from top thereof. The fishing head has dimensions within the range of sphere radius. Connected with inner sphere bottom part is stem having diameter less than sphere diameter. The stem is connected to the bottom through rod.

EFFECT: increased reliability and simplified technological operations to be performed.

2 dwg

Well whipped valve // 2068077
The invention relates to the oil industry and can be used in installations for the operation of wells, mainly with installations equipped with submersible pumps, for example, for well killing before they repair and drain the fluid from the raised tubing

Downhole tool // 2304212

FIELD: oil production, particularly devices operating inside wells, for instance for circulation valve opening and closing, as well as for packer seating or removal.

SUBSTANCE: downhole tool comprises rod provided with member made as hollow sphere truncated from top and bottom and shaped as upturned cup. The cup bottom has facet extending along outer diameter thereof. Fishing head is arranged on sphere bottom from top thereof. The fishing head has dimensions within the range of sphere radius. Connected with inner sphere bottom part is stem having diameter less than sphere diameter. The stem is connected to the bottom through rod.

EFFECT: increased reliability and simplified technological operations to be performed.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: selective well completion device includes a tube slide valve installed on the tube, the body of which is connected to the section of casing string, which is located opposite the productive formation and equipped with holes. Slide valve is equipped with two ring-shaped stops by means of which it is connected to the catch from time to time. Catch includes cylindrical housing with spring-loaded extendable cams and conical brace with a drive, which are located in it, and is connected by means of mechanical draft to the ground lifting mechanism attached to the ground power supply and control unit. At that, the device also includes independent electrical power supply located in the catch housing and made in the form of electrical accumulator or a set of electric batteries, at least two reed relays, similar number of signaling devices - electric lamps and at least three concentrically ring-shaped constant magnets installed in the well, as well as two radio contact devices mutually connected by means of radio on air. One of radio contact devices is located on the catch and equipped with the antenna in the form of electroconductive mechanical draft and connected to the independent power supply, and the other one is located on the ground surface and is connected via control unit to the ground power supply. Mechanical draft is flexible and made in the form of electroconductive rope. Drive of the brace includes electric heater equipped with thermostat, the working member located within its coverage and having the effect of shape memory in the form of straight-line wire from titanium nicelide and reverse element of the working member which is balanced and made in the form of a brace, and electric heat-insulating housing. At that, through the radio contact device fixed in the catch, the heater and each reed relay is separately connected to independent power supply, and by means of both radio contact devices the heater through the control unit and each reed relay separately through the control unit and one of the lamps are connected to the ground power supply.

EFFECT: enlarging functional capabilities of the device.

3 cl, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: down-hole valve includes housing with channel going through it, ball with through hole installed with the possibility of turning at its axis without longitudinal movement so that through hole coincides and not coincides with the said channel. The said ball axis is installed with the possibility of selective longitudinal movement in relation to the housing not depending upon the said turning.

EFFECT: increase of valve operation reliability via reliable keeping of open and closed position.

13 cl, 9 dwg

FIELD: oil and gas industry.

SUBSTANCE: multiposition device for selective switching over of flow through packer spindle between opposite directions contains: packer with packer spindle and sealing element designed so that spindle is retained in underground location when sealing element is in seating position; housing of crossflow coupling including components moved relative to each other and adjusted for its selective attachment near upper part of mentioned retained independently packer spindle, at that housing of cross-flow coupling when it is attached near upper part of packer spindle is able to generate relative movement providing opening and closing of channel on housing of cross-flow coupling.

EFFECT: reducing total length of device, orientation of device with higher accuracy.

13 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: there is a description of pipe string for well completion installed in position neighbouring to zone or zones where hydraulic fracturing (HF) is to be performed and inflow is to be obtained. In preferable version its peculiarity concludes in valves with sliding couplings allowing implementation of at least two configurations; wide opening and opening of channel with filtering material located in it. Valve unit may have three positions where a position of complete closing is added to two above mentioned positions. After run-in-hole operation valves may be set to position of wide opening in any order required for HF. After completion of HF valves may be either closed or set to filtering position in a differentiated way to get inflow from the zone subjected to HF in any required order. There are various methods for valves actuation described. Pipe string may be provided with telescopic forcers providing HF if it is required to do string cementing. According to alternative version pipe string run in uncased well is just provided with holes for HF liquid passing through and outer packers for provision of HF in any required order.

EFFECT: proving HF in separated zones of formation in required order.

40 cl, 33 dwg

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