Method for separation and control of development of deposits drains with horizontal well, and device for its implementation
FIELD: oil and gas industry.
SUBSTANCE: method involves lowering to the well of a pipe string with a cable, control devices in the form of electric valves, pressure and temperature measuring sensors and with one or several packers isolating the borehole space. Sensors are used, the information from which is supplied to a measuring unit installed on the well head. Signals for opening and closing of control devices are supplied via the cable from the wellhead control unit. The product is lifted to the surface by means of a pump via inter-tube space. The well is built with a horizontal section passing in the formation with different permeability zones. Packers are installed in the horizontal section of the well, thus separating the formation zones with different permeability. The inter-tube space is isolated with a plug, above which there arranged one above another are upper and lower control devices arranged in a vertical shaft and equipped with measuring sensors. Zones with equal or similar permeability are interconnected with each other by being grouped in two flows interconnected with the borehore space and the input of the upper control device or the inter-tube space and the input of the lower control device. Outputs of control devices are interconnected with the pump inlet, and the value of opening of control devices is derived with frequency separation via one cable, via which parameters are picked up from measuring sensors, as per the readings of which the value of opening of each of the control devices is determined. Each control device is made in the form of an electric motor with a reduction gear, which are arranged in the housing, the rotating shaft of which is connected through a screw-nut connection to a pusher and a valve having the possibility of tight interaction with a seat, below which there arranged is a shell with an inlet in the form of channels, in which a compensating chamber with elastic walls is arranged, which is filled with lubricating liquid and interconnected with inner space of the pusher and sealed space located above the pusher.
EFFECT: enlarging manufacturing capabilities in wells with zones of different permeability, and reducing costs.
2 cl, 4 dwg
The invention relates to the oil and gas industry, namely, development and exploitation of oil reservoirs with zones of different permeability, including using lateral and lateral horizontal wells from production strings.
The famous "Well installation for dual development of several operating facilities (RF patent for useful model No. 59139, IPC EV 43/14, publ. in bull. No. 34 from 10.12.2006,) consisting of columns of tubes forming step with one or more packers, one or more adjustable stasinowsky devices, and in each stage are set adjustable storywise device with automatic remote control and measuring instrument with automatic remote control, with each step of the installation is equipped with at least one conductive cable, the upper end of which is connected to the remote control unit at the surface, and the lower outlet of the cable is connected with the above-mentioned device and the device, and the packers are equipped with the connector and/or sealing device cable.
This device is a way of dual use multilayer wells, including the descent into the well pipe string, possesses the Noi between layers of one or more packers for zonal isolation, adjustable stasinowsky devices to control the flow rate of the fluid in the extraction and instrumentation with automatic remote controlled from the surface through a conductive cable, and the extraction is carried out depending on the technological parameters of each of the layers, defining them using instrumentation and changing bandwidth section stutzeri devices.
The disadvantages of the known device and method of its use are:
- the complexity of the application in a horizontal wellbore, as the installation of adjustable stutzeri devices and instrumentation, as well as electrically conductive cable is made difficult by the small sizes of trunk and often the complexity of its configuration;
- great material and time costs for the installation of equipment in the well, so as adjustable storywise devices and measuring instruments are positioned opposite each strata as oil and slabonelineinykh.
The closest in technical essence to the claimed is "the Way of dual use multi-seam wells (RF patent No. 2313659, IPC EV 43/14, publ. in bull. No. 36 dated 27.12.2007, including the descent into the borehole, at least one pipe string constant and re is n diameter and open or plugged lower end, fitted between the layers and between the layers, one or more packers for zonal isolation and control device to control the flow rate of the fluid during the extraction, while in the borehole at the level of its formation equip the string of pipe or regulating device, a transmitter for transmitting information on the measurements on the surface of the well and determine the process parameters of the fluid during the extraction, which descend into the well on the outside or inside of the tubing cable or pulse tube and connected with the measuring transducer or regulating device, or as a transmitter and regulating device, is made removable type, and after installation the wellhead is extracted fluid, guiding him through the regulating device and the transmitter, receive at the mouth of the information on the measurement from the measuring transducer and define the technological parameters of the fluid reservoir, and in their difference from the design value change carrying the cross section of the regulating device to achieve design values of process parameters for each of the layers. With the transmitter set the interface to keep the information on measured process parameters. And measuring conversion on the tel set in the form of a pressure sensor or differential pressure, temperature or temperature, or flow, or volume, or mass debitmetre. Moreover, the regulating device operates in the form of electric or electromagnetic, or pulsed valve with a shut-off element, the degree of opening of which is controlled from the surface of the well by the alarm or pulse through a cable or pulse tube.
To implement the method using a device consisting of a pipe string, with one or more packers, one or more control devices, and the string of pipe or regulating device equipped with a transmitter with interface cable or pulse tube.
The disadvantages of this method and device for its implementation are:
- the complexity of the application in a horizontal wellbore, so as to install control devices and transducers, and cables (or pulse tubes) is hampered by the small size of the barrel and the complexity of its configuration, and in the case of using cable technology is generally impossible;
- great material and time costs for the installation of equipment in the well, so as actuators and transducers set opposite each of the strata as oil and slabonelineinykh.
the technical objectives of the invention are expanding the technological capabilities when the device is in wells with zones of different permeability, including lateral horizontal holes through the production wells and connect permeable and medium - or high-permeability intervals through two channels with adjustable surface mode of production of each category of zones of separation between themselves and reducing the cost of installation of equipment for the placement of control devices, sensors and cables in a vertical wellbore.
The technical problem is solved by a method including the descent into the well pipe string, cable, control devices, in the form of electric valves measuring gauges temperature and pressure and with one or more packers, divisive downhole space, and the information from the sensors is fed to the measurement unit installed on the wellhead, and the signals for opening and closing the regulating devices served by cable with wellhead control unit, with the rise of products on the surface of the implement pump in in-line space.
What's new is that well built with a horizontal segment passing through the formation with the different zones of permeability, and the packers are set in the horizontal section of the well, separating the zone with different permeability, in-line space alienate the cap, above which size is up on top of each other the upper and lower regulating device, placed in a vertical hole and equipped with measuring sensors, the zones with the same or very similar permeability reported between the groups in the two streams, is in communication with the downhole space and upper entrance control device or in-line space and sign the bottom of the regulating device, and outputs a regulating device in communication with the pump inlet, and the amount of opening of the regulating devices produce a frequency division by a single cable, which produce and removing parameters from the measuring sensors, the readings of which determines the amount of opening of each of the regulating devices.
The technical problem to implement the method is also solved by a device comprising a string of pipe with cable, control devices in the form of electric valves measuring gauges temperature and pressure and with one or more packers, overlapping downhole space, and sensors associated with the unit of measurement at the wellhead, and a regulating device connected by cable to the control unit, with higher regulatory devices posted by the pump to raise the product to the surface by a line space.
What's new is that the well will be equipped with a horizontal section passing through the layer of the different zones of permeability, and the packers placed in horizontal section of the well, separating the zone with different permeability, in-line space is fragmented blank, on which are mounted one above the other of the upper and lower regulating device, placed in a vertical hole and equipped with measuring sensors, the lower regulating device in communication with the tubular space below the stub, and the output - tube space above the plugs, the upper entrance of the regulating device in communication with the downhole space, and the output from in-line space above the stub, which communicated to the pump inlet, with downhole space, cut off the puck-Rami, with the same or close permeability collected in two groups, each of which is communicated with a line space or downhole space through one or more nozzles, and the sensors and actuators are connected respectively with the unit and the control unit one cable, each regulating device made in the form housed in the motor housing with gear, torque shaft which is connected through a connection "screw-nut" with the plunger and valve made with the possibility of a tight interaction with the saddle, which is placed below stack the n input channels, hosts compensation chamber with flexible walls filled with lubricating fluid and is in communication with the interior space of the plunger and the sealed space above the plunger.
Figure 1 shows a device - General view; figure 2 shows the upper regulating device (longitudinal section); figure 3 - cross section a-a in figure 2 (enhanced); figure 4 shows the lower regulating device (longitudinal section).
The device for separation and control of production inventory, drained horizontal well 1 (figure 1), includes the string of pipe 2 with the cable 3, top 4 and bottom 5 of the regulating device in the form of electric valves 6, mounted on the control devices 4, 5 measuring the pressure sensor 7 and the temperature Vis one or more packers 9, overlying the inner space 10 of the well 1. The sensors 7, 8 are connected by the cable 3 with the unit 11 on the mouth 12 of the well 1, and regulating devices 4, 5 are connected to the same cable 3 to the control unit 13 of the control devices 4, 5. Higher regulatory devices 4, 5 are placed the pump 14 to raise the product to the surface by a line space 15.
Horizontal section of well 1 build through the layer 16 with different permeability zones a and B, sharing the results of geophysical issledovaniy the help of packers 9 layer 16 on the intervals permeable and medium - or high-permeability B. With this in-line space 15 divide by a plug 17, which are mounted one above the other top 4 and bottom 5 of the regulating device, placed in a vertical hole 18 wells 1 and is equipped with measuring sensors 7, 8.
The inlet 19 (figure 4) the lower regulating device 5 is in communication with the tubular space 20 below the stub 17 and output channels 21 - tube space 22 above the stub 17. The inlet 23 (2) upper control device 4 is in communication with the downhole space 10 (Fig 1), and the output 24 (figure 2) - with in-line space 15 (Fig 1) above stub 17 (Fig 1, 4), which indicated the entrance 25 (1) of the pump 14. The intervals a and B, separated by packers 9 in the horizontal section of the well 1, the joint through the nozzles 26, 27, passing through the packers 9, in two streams, each of which is communicated with a line space 15 or downhole space 10. For example, intervals And interconnected and downhole space 10 through pipe 27 and the spacing B of the joint between a line and a space 15 through pipe 26.
In addition, each regulating device 4 or 5 made in the form accommodated in the housing 28 (2, 4) of the motor 29 with the gear 30, the enemy is surrounding the shaft 31 which is connected via a connection screw-and-nut 32 with the plunger 33 and the valve 6, made with the possibility sealed engagement with the seat 34. Below the seat 34 posted by Cup 35 with the input in the form of holes 23 (2) or 19 (4) hosts the compensation chamber 36 (2, 4) with elastic walls in the form of, for example, rubber pipe 37 filled with lubricating fluid and reported by the hollow tube 38 with the internal space 39 of the pusher 33 and sealed by, for example, o-rings 40, the space 41 above the pusher 33.
The method is carried out in the following sequence.
Drill into the reservoir 16 (1) horizontal well 1. After conducting geophysical surveys and determine the number and lengths of the intervals of oil production (permeable - and medium - or high-permeability - B) in the horizontal section of the well 1 to the string of pipe 2 down and set, insulating between the intervals a and B, the downhole space 10, the packers 9 nozzles 26, 27, linking all the same neftepromremont intervals, and in a vertical hole 18 wells 1 are placed one above the other regulating devices - the bottom 5 and top 4 in the form of electric valves 6 with the measuring pressure sensors 7 and temperature 8 and an electric cable 3. With the valves 6 regulating devices 4, 5 are open to the best of occupancy nutrit the service space 15 production wells 1.
According to the information transmitted from the sensors 7, 8 on the measurement unit 11 mounted on the mouth 12 of the well 1, determine the pressure of each of the threads of the oil production and the corresponding temperature. Depending on the received data wellhead control unit 13 serves on the appropriate frequency on the cable 3, the signals on the cover (or priotkrytye) of the corresponding regulating device 4 or 5. The rise of production wells 1 on the mouth 12 is performed by the pump 14 through line space 15.
Monitoring data received from the sensors 7, 8 carry out constantly. If necessary, change the throughput cross section of the valve 6 control units 4, 5. For example, for enhanced oil recovery with intervals As well 1 will need to open the valve 6, the upper control device 4. To do this, the control unit 13 at the mouth of the 12 wells 1 signal cable 3 regulating device 4. When the motor 29 (figure 2)located in the housing 28 of the device 4 through the gear 30 begins to rotate in the desired direction of the shaft 31, which in turn is due to the connection of the screw-and-nut 32 moves the pusher 33 spline connection 42 from the valve 6. Under the action of the downhole pressure valve 6 (2, 3) moves along the guide 43 from seat 34 (figure 2), increasing its flow cross-section. The production from the wells of the intervals And passes the hour is ichno through pipe 27 (Fig 1), partially gets in front of him and moving on downhole space 10, enters through the inlet openings 23 (2) in the Cup 35, then through the seat 34 of the valve 6 and the output channels 21 (figure 2, 3) of the guide 43 and the output 24 rises on-line space 15 (Fig 1) to the input 25 of the pump 14.
To eliminate the load on the connection, the "screw-nut" 32 (2, 4) from downhole pressure valve 6 and the pusher 33 in the Cup 35 is placed compensating chamber 36, the rubber pipe 37 which is compressed under the action of the downhole pressure transmitting pressure through the lubricating fluid inside the pipe 37 through the pipe 38 and the channel 44 in the inner space 41 above the pusher 33. Since the cross-sectional area of the upper part 45 of the pusher 33 is equal to or slightly less than the cross-sectional area of the lower part 46 of the pusher 33 (or seat 34 of the valve 6 in the case if the valve 6 is fully closed), the pressure below the plunger 33 and above it are balanced (or almost balanced), relieving the load on the connection 32 from downhole pressure and thereby increasing the lifetime of the connection 32 and the rotating shaft 31, the motor 29 and gear 30. At the same time lubricating fluid performs the function of lubrication connection screw-and-nut 32 and the spline 42. For flow of lubricating fluid from the space 3 in the case of movement of the pusher 33 is channel 47.
The same principle works carried out and to the bottom of the regulating device 5 (Fig 1, 4). To prevent unauthorized lifting of the production well 1 (figure 1), bypassing the devices 4, 5, below them in-line space 15 install the plug 17. Production wells 1 interval B in this form through the pipe 26 into a single stream through the tube space 20 (figure 4) and holes 19 below the stub 17 of the valve 6 of the device 5 and later (when you open the valve 6 through the output channels 21 and tube space 22 above the stub 17 in-line space 15 (Fig 1). In the particular case of the pipe 26 perforined holes 48.
Thus, the use of the invention allows to expand technological capabilities in mining production from horizontal wells, connecting simultaneously permeable to medium - or high-permeability intervals extraction with various geophysical properties, which are separated by packers, two independent channels through uniting their pipes passing through the packers adjustable from the surface of the mode of production of each category of zones of separation between them. Due placement of control devices, sensors and cables in a vertical wellbore reduces the cost of installation of equipment and improving the quality and reliability of its set the Cai.
1. The method of isolation and control of production inventory, drained horizontal well, including the descent into the well pipe string, cable, control devices in the form of electric valves, measuring pressure and/or temperature and one or more packers, overlapping downhole space, and the information from the sensors is fed to the measurement unit installed on the wellhead, and the signals for opening and closing the regulating devices served by cable with wellhead control unit, with the rise of products on the surface of the implement pump in in-line space, wherein the well is built with a horizontal segment passing through the formation with different zones of permeability, and the packers are set in the horizontal section of the well, separating the zone with different permeability, in-line space alienate the cap, above which are placed one above the other of the upper and lower regulating device, placed in a vertical hole and equipped with measuring sensors, the zones with the same or very similar permeability reported between the groups in the two streams, is in communication with the downhole space and upper entrance control device or in-line space and entrance bottom is the first regulating device, moreover, the outputs of the regulating device in communication with the pump inlet, and the amount of opening of the regulating devices produce a frequency division by a single cable, which produce and removing parameters from the measuring sensors, the readings of which determines the amount of opening of each of the regulating devices.
2. The device for implementing the method, comprising a string of pipe with cable, control devices in the form of electric valves, measuring pressure and/or temperature and one or more packers, overlapping downhole space, and sensors associated with the unit of measurement at the wellhead, and a regulating device connected by cable to the control unit, with higher regulatory devices posted by the pump to raise the product to the surface by a pipe to the space, wherein the well is equipped with a horizontal segment passing through the formation with the different zones of permeability, and the packers placed in horizontal section of the well, separating the zone with different permeability, in-line space is fragmented blank, on which are mounted one above the other of the upper and lower regulating device, placed in a vertical hole and equipped with measuring sensors, the lower adjusting the second device is in communication with the tubular space below the stub, and the output - tube space above the plugs, the upper entrance of the regulating device in communication with the downhole space, and the output from in-line space above the stub, which communicated to the pump inlet, with the downhole space cut off by the packers with the same or very similar permeability, are collected in two groups, each of which is in communication with the tubular space or downhole space through one or more nozzles, and the sensors and actuators are connected respectively with the unit and the control unit one cable, each regulating device made in the form housed in the motor housing with gear, torque shaft which is connected via a connection "screw-nut" with the plunger and valve made with the possibility of a tight interaction with the saddle, below which is placed a glass of input channels that hosts the compensation chamber with flexible walls filled with lubricating fluid and is in communication with the interior space of the plunger and the sealed space above the plunger.
FIELD: oil and gas industry.
SUBSTANCE: in order to implement inventions, the unit is equipped with a removable device of flow distribution with liquid transfer channels and flushing channels of annular space above an upper packer against accumulation of mechanical impurities to provide the possibility of removing the plant from the well shaft. The above plant is equipped with the removable device of liquid cleaning from mechanical impurities with possibility of its being replaced without lifting the whole plant. The following instruments are installed: a flow metre, a humidity metre, a pressure sensor, a temperature sensor for measurement of liquid parameters, on the basis of which necessity for cleaning or replacement of the liquid cleaning device is evaluated. A pumping valve is installed for connection of in-tube and behind-tube spaces and minimisation of washaway of a casing string wall, a hydraulic anchor is installed to reduce vibration of the electric centrifugal pump plant - ECPP and to prevent negative influence of compressive loads on ECPP. A string disconnector with functions of telescopic connection and a disconnector is installed. Lower part of the plant is equipped with a funnel or a shank, or with a cutoff valve to cut off the liquid flow of lower formation.
EFFECT: improving efficiency of the method and operating reliability of the device at transfer of liquid from upper formation of the well to the lower one.
9 cl, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: device includes a hydraulic piston pump connected through a plunger to a drive rod arranged in a tubing string connected to a cylinder of the hydraulic piston pump by means of an upper adapter, and a centrifugal submersible pump connected to a power cable of the drive through the cable sealing assembly, as well as a packer disconnecting upper and lower formations of the well. The device includes a sleeve restricted on ends with upper and lower adapters, which forms together with the well shaft a tube annular space interconnected with upper well formation, and an annular channel with the hydraulic piston pump cylinder for connection of an outlet of centrifugal submersible pump to the tubing string through holes made in the hydraulic piston pump cylinder. The hydraulic piston pump cylinder is adjacent with its end face to a hydraulic nozzle for connection of the tube annular space to the hydraulic piston pump. Lower adapter connects the cylinder of the hydraulic piston pump to a shank tightly located in the packer, downstream of which the shank is connected to the outlet of centrifugal submersible pump, on the opposite side of which there attached is a telemetry unit to measure parameters of pressure, temperature and liquid resistance of lower formation, which is connected via a communication cable of transfer of measured parameters to an indication device, which is located in the well head. Communication cable and power cable of centrifugal submersible pump are tightly passed through the packer; for that purpose, in the packer cylindrical wall there is a sealing assembly of power and communication cables of the telemetry unit. The latter is located on the level of the well lower formation. Drive rod of the hydraulic piston pump can be hollow. The plunger cavity is interconnected through that rod with the well head.
EFFECT: simpler erection of process equipment of the well and higher real-time well operation efficiency.
2 cl, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves drilling and construction of horizontal productive wells with secondary development of sections of various permeability and extraction of the product. According to the invention, horizontal well is drilled out of a section with minimum permeability to the section with higher permeability relative to the first section or vice versa. After that, a boundary between sections with various permeability is determined by means of geophysical investigations. Secondary development of sections is performed with increase in density of perforated holes at drilling intervals; at that, density of perforation holes is inversely proportional to permeability of the corresponding sections. The well is equipped with pumping units for simultaneous separate operation of sections with installation of a packer between drilling intervals. Formation product is extracted from different sections with different operating modes depending on permeability of sections - the lower permeability of the section is, the higher productivity of the pumping unit shall be. After development of the section with high permeability, the horizontal well with simultaneous separate operation is changed over for injection of a displacement agent to that section. After the section with low permeability is developed, the well is fully changed over to the injection well.
EFFECT: improving efficiency of the method owing to more complete and uniform development of the formation from the section with minimum permeability and increasing oil extraction owing to arrangement and operating mode of the horizontal production well with simultaneous separate operation.
1 ex, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: proposed method involves drilling of a horizontal well and cementing of a casing pipe to the formation roof, determination in the formation of zones with various permeability, lowering to the well of a pipe string with filters having the possibility of mechanical opening and closing from the inside, and packer from the outside, and installation of packers with disconnection of filters in an open shaft. According to the invention, packers are installed for disconnection of the formation zones with various permeability. Productivity and waterflooding of zones is determined by series opening and closing of filters located opposite the appropriate zone of formation. After that, zones with close permeability are determined by being combined into groups. Operation of wells is performed in turn in each group by opening the filters relating to the specified group and by closing the rest ones. At increasing waterflooding in one of the groups, a zone with maximum waterflooding is determined in it by subsequent closing and opening of the corresponding filters in the group. After that, the zone with maximum permeability is treated with water insulating compound, or the corresponding filter is completely shutoff. The well operation is continued in the specified mode. After process exposure of the zone treated with water insulating compound the influx is induced from that zone and operated with zones having permeability close to that one.
EFFECT: increasing oil extraction rate owing to involving in extraction of the formation products of zones with lower permeability and zones waterflooded during the operation after process treatment.
FIELD: oil and gas industry.
SUBSTANCE: method involves perforation of two productive intervals, lowering to the well of a layout consisting (in an upward direction) of a setting device, a shank, a packer located below upper productive interval, a pipe string with a drain valve on the level of upper productive interval, and on the head with a tee-piece with a cutoff branch and a cutoff branch pipe above the tee-piece, packer setting, swabbing in the pipe string of lower productive formation, build-up of a recovery curve of a level for lower productive formation, evaluation of productivity of lower productive formation; filling of the layout with water after swabbing of lower productive formation through the tap and the tee-piece; waiting till water goes downwards and air upwards; air bleeding through a branch pipe, repetition of operations till the layout is filled with water; lowering to the pipe string and arrangement in the setting device of a cutoff device' creation of pressure in the pipe string and opening of the drain valve' swabbing in the pipe string of upper productive formation; build-up of a recovery curve of the level for upper productive formation; evaluation of productivity of upper productive formation, lifting of the layout out if the well, lowering of a downhole pumping equipment and operation of the well.
EFFECT: possible development of the well opening two productive formations without lowering and lifting operations for development of the second formation.
2 cl, 1 ex, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: device for simultaneous and separate operation of multiple-zone wells includes a lowering-and-lifting mechanism, a control shell and valve sleeves. The latte include a fixed sleeve with axisymmetrical grooves and a turning perforated valve sleeve with screw grooves. Upper and lower conical drums with cams are installed in the control shell. Upper cams are offset relative to lower cams through an angle equal to an angle between grooves of fixed and turning perforated valve sleeves; upper and lower springs are supported on a support washer, upper and lower drums, lower drum is connected to a rope, on which a load is installed.
EFFECT: reduction of costs for operation of multiple-zone wells due to a separate operation of zones.
FIELD: oil and gas industry.
SUBSTANCE: method includes assembling at the mouth and descending into the well of long string with packer and short string. Preliminary the operated string is gauged by the gauge with length not less than packer's length, there defined is an interval of link for packer not less than 3.5 m long with concrete in behind-the-casing space, the packer is descended at the casing string, there performed is an exploration with determination of intake of disintegrated formations, the packer is lifted. At long string assembling prior to packer installation there assembled is a branch pipe with locking ring and highly pressurised couplings or couplings with sealant on thread that have external diameter reduced by 2 mm compared to the standard, above the packer there mounted is a pipe branch with couplings, one pipe of casing string with reference pipe branch, then the casing string is assembled on highly pressurised couplings or couplings with sealant on thread, the packer is mounted, there performed is a tensioning of long string by load exceeding the string dead weight by 2-3 t, the long string is fixed in eccentric at well mouth, eccentric is fixed in wellhead equipment. At short string installation the tubing is assembled on couplings with sealant on thread, the string bottom is equipped with coupling, short string includes additional pipe branches, by which the couplings of one string are located between the couplings of the other string, after descending of each 4-6 tubes the short string is lifted and descended at the length of 1 tube not less than 2 times, the shoe of the short string is located above the roof of upper formation by 20-30 m. The well is filled with anti-corrosion fluid above the level of short string bottom. For string installation there used are the tubes with internal anti-corrosion and antifouling smooth coating. There performed is the string gauging by gauge with polyamide coating.
EFFECT: increase of method efficiency due to exclusion of string twisting relatively each other, thread loosening and tubes turn-away, exclusion of pressure-tightness failure.
FIELD: oil and gas industry.
SUBSTANCE: plant is designed for being used in oil industry for oil extraction with well pumps at simultaneous separate operation of two formations of one well. The plant for simultaneous separate operation of two formations in the well includes tubing strings and plunger pumps, suction and delivery valves, which are located in the casing. A linear electric motor is installed between pumps. The plant is equipped with a packer. An annular space is formed between the casing and the linear electric motor. Combined assemblies, the upper one of which includes built-in valves, are installed in upper and lower parts of the casing. It also includes a process hole for direction of an uprising flow of downhole fluid of under-packer zone from annular space to tubing string and a cable entry installation hole. Lower assembly is tightly connected to the casing and to the tubing.
EFFECT: simpler design, higher reliability and provision of separation of downhole fluid flows in under-packer and above-packer zones.
2 cl, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves lifting of formation fluid from upper formation by means of a submersible pump and pumping of pressure fluid from surface to lower formation to maintain formation pressure. Flow of fluid pumped from the surface to the well is used not only as energy carrier to maintain pressure in lower formation, but also as working fluid for a hydraulic downhole motor driving the submersible pump for lifting of the fluid from upper formation. Device consists of a screw-type submersible unit that comprises a screw pump driven from a hydraulic screw motor, an axial support and channels for passage of power and produced fluids. Besides, the housing of the submersible unit is provided with two packers, one of which is located above the perforation zone of upper formation, and the second one is located above perforation zone of lower formation. All the parts of rotary group of the submersible unit have a through longitudinal channel connecting the inner cavity of the tubing to perforation holes of lower formation.
EFFECT: higher effectiveness of the method and simpler device design.
5 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves lowering of packers and equipment for extraction (pumping) of product in interval of product extraction on tubing string located against each productive formation. Down-hole measurements are performed by sensors. Obtained date is transmitted to ground receiving-processing unit by means of electronic self-powered measurement modules transmitting data signals by tubing string by electromagnetic pulses to common electronic self-powered transmitting module. Module is installed in tubing string assembly above the highest productive formation. Data high-frequency signals are amplified and transmitted to ground receiving-processing unit through rock. Equipment for extraction (pumping) of product is controlled by communication channel or by hydraulic communication channel using independent electronic modules. Modules contain housing in which the following is installed: valve for control of supply (removal) of fluid medium controlled by step-type tiny engine with driving mechanism of valve gate rotation, autonomous power supply unit, receiver of fluid pulses and dipole receiver of electromagnetic oscillations, amplifier modules of decoding device and power amplifier.
EFFECT: improving efficiency of monitoring of simultaneous separate operation of wells by means of provision of reliability of data transmission by two-way wireless communication between well equipment and ground receiving-processing unit.
8 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: method lies in accumulation of liquid and gas in a well, cyclic carryover of accumulated liquid from the liner to tubing string and throwing of liquid column by gas. According to the invention associated gas is separated from liquid-gas mixture and directed to the upper part of gas-lift unit to gas burning unit. Air under high pressure is fed to the same unit in order to provide conditions for gas-air mix burning ensuring high-speed burning process accompanied by sharp increase of temperature and pressure. In result it provides opening of return valve in the lower part of tubing string and throwing of liquid column by gas being a combustion product. Thereafter cycle of gas separation from liquid-gas mixture and its burning in gas-air mix is repeated as far as liquid and gas enter through the service valve from annular space to the lower part of submerged gas-lift unit at receipt of a signal from the earth control station.
EFFECT: increase in efficiency, reduction of power consumption, control of production process and reduction of costs for well operation.
FIELD: oil and gas industry.
SUBSTANCE: method consists in movement of a housing of a continuous circulation tool to an adapter having a channel passing through it and intended for connection in a pipe string in the well and selective movement of drilling fluid between the housing and a side hole in the adapter; in addition, the continuous circulation tool includes a shutoff device, and actuation of a shutoff mechanism to introduce a shutoff element of the shutoff device through the side hole in the adapter for insulation of drilling fluid flow through at least one section of the channel. A system for carrying out well operations with continuous circulation of drilling fluid, which contains a continuous circulation tool interconnected with a tubular column of the well, which contains an adapter and is intended for selective shutoff of the drilling fluid flow to tubular column of the well, a pipe manipulating device near the adapter, which contains the following: a pipe wrench, pipe wrenches, a pipe wrench, a retaining wrench, a pipe wrench and a spinning wrench and a device for mechanised suspension and unscrewing of pipes.
EFFECT: maximum drilling speed.
34 cl, 27 dwg
FIELD: oil and gas industry.
SUBSTANCE: system and method for increasing a well flow rate are described in the application. The system includes processor (150) that processes commands contained in a software, which include command for monitoring during the specified period of time of an actual fluid flow rate from each productive zone (52B, 52b) of the well in compliance with the first tuning of devices for control of the flow rate and applying the analysis of the chain using a method of node potentials to a variety of input data chosen from the data of well sensors, data of surface sensors, one or more current positions of devices, for the purpose of setting one or more new settings, at which increase in the well flow rate will be provided.
EFFECT: increasing productive capacity of well.
18 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: system includes several tubular elements located in each other with the channels directing the fluid flows from different formations of the well to different channels of tubular elements fixed in the casing pipe by means of packers. Channels are equipped with spool-type gates with control electric drives providing separate movement of fluid flows from different formations through different channels by means of a processor and a fluid parameter measurement sensor installed in each channel and functionally connected to the automatic control processor of the valve in compliance with the information received from the sensor, and further selective mixing of flows in the area of the casing pipe. Tubular elements are fixed in the casing pipe with upper packer, and at their inlets, they are connected to the coupling directing different flows via different channels from different formations, which is connected via a central channel by means of the shank to the extracting device of the product from bottom formation of the well, which is fixed in the casing pipe with lower packer. Unit of separate supply and accounting is connected via a branch pipe to the electric drive of the submersible centrifugal pump, in which a communication cable is placed to control the valves from the electric feed and control cable, which attaches the pump electric drive to the well electric feed and control station.
EFFECT: increasing operating efficiency of the well formations.
3 cl, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: method includes blocking of a perforation interval by means of injection of a blocking liquid and its pushing with a killing fluid to a bottomhole and to a bottomhole area of a bed with simultaneous monitoring of pressure at a well head, gas relief and process settling. At the same time, prior to injection of the blocking fluid, a sand screen is formed by injection of a pulp of quartz sand with fraction of 0.6-1.2 mm in a carrier fluid in two portions with a flow rate of a carrier fluid, the value of which does not exceed the maximum permissible value, defined according to the formula. At the same time the volume of the quartz sand in the first portion of the pulp is calculated in accordance with the formula with further process settling of the well for the time determined according to the formula after injection of the first pulp portion. The volume of the quartz sand in the second pulp portion is taken as equal to the volume of suffosion channels produced in the sand screen. The blocking fluid is a certain composition. The blocking fluid volume is previously calculated according to the formula. Besides, at the moment of completion of blocking fluid pushing, hydrodynamic pressure is determined in a tubing string. Afterwards the process settling of the well is carried out. Further injection of the killing fluid into the well is carried out along the tubing string until it appears at the well head. At the same time the well head pressure is controlled in the annular space of the well by means of gas and blocking fluid relief, providing for pressure at the inlet to the tubing string as permanent and equal to the predetermined hydrodynamic pressure.
EFFECT: improved efficiency of gas well killing.
FIELD: oil and gas industry.
SUBSTANCE: design of low-angle and horizontal wells includes a technical string, an operating string and a lift string. The operating string is cemented above the productive formation roof. The operating string in the productive formation is divided into sections with casing packers, and sections include filter sections and sections of solid pipes. The lift string in the productive formation is equipped with operating packers, installed inside the sections of solid pipes of the operating string and groups of controlled valves equipped with calibrated inlet side holes arranged inside filter sections. A seat nipple is installed at the end of the lift string. Controlled valves and the nipple are made as capable of interaction with control devices lowered inside a lift string.
EFFECT: possibility to control an inflow from isolated sections of a low-angle or horizontal well shaft or their total selective water isolation.
FIELD: oil and gas industry.
SUBSTANCE: development method of heavy oil or bitumen deposit with control of well product extraction involves construction of upper injection and lower production wells with horizontal sections located one above another. At construction of wells their horizontal sections are equipped with filters installed opposite productive formation zones. Inside filter with non-perforated interval in production well there arranged is a shank provided with inlet holes dividing the filter into extraction zones. Besides, shank is equipped on the inner side with a stock with side channels. Inner space of stock is interconnected with inlet of pump lowered to production well on the tubing string with possibility of longitudinal movement of the tubing string together with pump and stock in the shank. Heat carrier is pumped through horizontal injection well with warming-up of the formation by creating the steam chamber, and product is extracted through horizontal production well. Thermograms of steam chamber are taken, the chamber's warm-up state is analysed for uniform heating and available temperature peaks, and considering the obtained thermograms, uniform heating of steam chamber is performed. Before the tubing is lowered to production well, first, stock is lowered with a shank concentrically arranged on it and fixed in transport position with a shear screw. Besides, on the outer side of the shank lower end there installed is heat-resistant packer; after the stock is lowered to production well, lower end of tubing is put on its upper end. Tubing is equipped with a pump. Tubing is lowered to production well till the packer is arranged at non-perforated interval of production well filter; after that, packer is installed by dividing the filter of production well into two extraction zones - initial and final. Uniform heating of steam chamber is performed by supplying the heat carrier through injection well. Penetration of heat carrier and/or formation water to the pump inlet is avoided by controlling the product extraction to the pump inlet from the initial extraction zone. Besides, product extraction volume is reduced in the initial extraction zone where temperature peaks occur. For that purpose, inlet shank holes corresponding to the initial extraction zone are made with reduction of carrying capacity from face to head, and side channels of stock are provided with possibility of alternating interaction with one of inlet shank hole in the initial extraction zone. This is performed by restricted longitudinal movement of pipe string together with pump and stock relative to shank by increasing or reducing the number of connection pipes on upper end of pipe string depending on the distance between inlet holes of the shank. Pipe string is fixed on the head of production well in the required position by means of a face plate on a supporting flange, and shank hole corresponding to the final extraction zone is made in the form of an open stock end.
EFFECT: improving the control of product extraction volume from extraction zones; simpler erection and lower metal consumption on the design.
FIELD: oil and gas industry.
SUBSTANCE: method of fluid extraction from the well is performed in the following way: the first adjustment at least of the first well equipment for fluid production is performed; the first set of input parameters is chosen, which includes at least one parameter referring to serviceability degree at least of one second well equipment and sets of parameters chosen from the group including the data referring to efficiency, pressure, temperature, presence of the chosen reagent, content of water, content of sand and flow rate of injected chemical reagents. The first set of parameters is used to be entered to the computer model, and the second adjustment at least of one first well equipment is performed, which will provide at least extension at least of one second well equipment or increase in completed well flow rate. Also, control system of operation of electric submersible pump is proposed, which contains information storage data base relating to operating range of submersible pump, and processor for adjustment at least of one first well equipment, which has the possibility of using at least one measured operating parameter of submersible pump and information stored in the data base.
EFFECT: invention allows performing the monitoring of well shaft state and serviceability degree of various equipment and taking actions, which will provide increased or optimum production of hydrocarbons from the well.
25 cl, 4 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to production of natural gas ad may be used in methane-coal well development. Proposed method comprises perforation of operation string in interval of production bed and its hydraulic fracturing. Thereafter, operation string is flushed. Settled fluid level allows defining initial counter pressure on productive coal bed. Production tubing with borehole pump is lowered into flow tubing, the pump being located under perforation interval. Well head is sealed. Borehole pump is used to reduce fluid level in well annuity space to below perforation interval together with injection of buffer gas therein at initial counter pressure on the bed. Thereafter, feed of buffer gas is interrupted. Said fluid level in annuity space is maintained by means of borehole pump. Inflow of bed fluid is caused by releasing excess pressure of buffer gas from annuity space in control over variation in gas quantitative and/or qualitative composition at well head. Change in released buffer gas composition allows defining the beginning of coal methane from productive bed. Now, rate of buffer gas pressure release is decreased.
EFFECT: higher efficiency of well development.
FIELD: oil and gas production.
SUBSTANCE: proposed method consists in using tubing incorporating borehole pump and packer. Note here that borehole pump is equipped with check valve. Check valve is arranged close to and above the pump on tubing outer side to allow one-way fluid flow from tubing into tube space. Said tube space is filled with process fluid with corrosion inhibitor in required concentration. Pressure in tube space is maintained not exceeding tolerable magnitude by means of electric-contact pressure gage connected to borehole pump control unit. Reagent if injected into tubing from wellhead with tube space gate valve.
EFFECT: efficient injection, safe production of oil or gas.
FIELD: mining industry.
SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.
EFFECT: optimized well operation.