Device for extraction from two zones of a well

FIELD: oil and gas extractive industry.

SUBSTANCE: device has operation columns of upper and lower well zones, placed eccentrically one inside the other in upper zone of well, double airlift column, mounted in upper well zone, and double airlift column, connected to operation well of lower well zone, separation column, mounted coaxially to operation column of upper well zone, and cementation pipe. According to invention, in a well with significant power of non-productive zone it is equipped with additional separating column with cleaning channels for lowering drilling tool therein and drilling well to lower well zone with removal of drilling slurry by double airlift column of upper zone through cleaning channels. Additional separating column is combined coaxially with operation column of lower well zone and is rigidly fixed to separation column.

EFFECT: higher efficiency.

1 dwg, 3 cl

 

The present invention relates to the field of construction and production of fluid minerals from two producing horizons, in particular aquifer, one well, and can also be used in drilling for mineral water and in the oil and gas industry.

In water the traditional way the development of several aquifers is a well-known method of well construction wells the number of productive horizons with their location in close proximity to each other.

The disadvantage of this method is a significant capital and operational costs for the construction and use of water and the inability to prevent contamination of productive horizons in the drilling process, as cleaning and washing exposed only exploited aquifer. Especially subject to pollution horizons when drilling in complicated hydrogeological conditions with the absorption of drilling fluid and impaired circulation.

Also known system complete wells [1]. The system includes a separation column located in the extended portion of the main wellbore, the system provides isolation and separate the flow of produced fluids.

However, this system is suitable for operating pressure of productive horizons.

Also, a device for equipment wells [2], containing concentrically placed one within the other casing with stepped arrangement of filters for each production zone wells and perforated production casing through one for airlifting lifting fluid from the study horizon.

A disadvantage of the known devices is the need to overlap all productive horizons, including horizons, which does not require overlap filter columns, which significantly increases the capital cost of construction of the wells, and the known device is intended for the construction process and observation wells.

Closest to the present invention is a device for the production from the two zones of the well [3], which includes a production casing upper and lower zones of the well, placed one within the other eccentric in the upper zone wells, dual airlifting the column installed in the upper zone wells and double airlifting the column is in communication with the production column of the lower zone wells, separation column, mounted coaxially with the production column of the upper zone of the well and cementing the pipe.

The known device has a primary use in wells with low power intermediate unproductive areas. the task of the present invention is the increase in the use of the device for production from the two zones of the well, including wells with significant power unproductive areas, ensuring high efficiency of drilling operations, reliable disconnection, isolation of the productive zones of the well and control during operation.

This task is solved in that the device for production from the two zones of the wells, including production casing upper and lower zones of the well, placed one within the other eccentric in the upper zone wells, dual airlifting the column installed in the upper zone wells, dual airlifting the column is in communication with the production column of the lower zone wells, separation column, mounted coaxially with the production column of the upper zone of the well and cementing the pipe, provided with an additional separation column placed coaxially with the production column of the lower zone and is rigidly fixed to the separation column.

In addition, dual airlifting column, installed in the upper zone of the well, is connected to the additional separation column with the possibility of a limited axial descent, ascent.

Also cementing pipe installed in the production string of the lower zone of the well and provided with a cementing head, and operational column of the lower zone of the well is equipped with an expansion coupling at the bottom.

The essence of the image is the shadow explained bellow.

The well consists of two productive zones, the top 1 and bottom 2, includes a casing zones of the upper 3 and lower 4, placed one within the other eccentric in the upper zone of the well.

In the water of the well established separation column 5, which is installed coaxially with the production column of the upper zone and provided with eccentrically placed additional separation column 6, coaxially installed with the production column of the lower zone 4.

Additional separation column 6 is connected with a double airlifting column 7, installed in the upper zone of the well. Production column of the lower zone 4 is provided with a double airlifting column 8, communicated with her and a selective filter (or deaf column) 9.

Production column of the lower zone 4 provided in the lower part of the retainer sleeve 10, which reported cementing pipe 11 mounted inside the casing of the lower zone 4.

Additional separation column 6 are made with flushing channels 12 and provided with a fixed sleeve 13.

Cementing pipe 11 provided in the lower part of the cementing head 14.

Double airlifting column 7 is provided with a threaded part 15 for coupling 13. Double airlifting columns 7,8 consist of drainage and air columns.

P the bot device is as follows.

After drilling, install and cementation of casing top of zone 3 reveal aquifer zones 1 and continue drilling to a depth of 5 m below the separation column 5.

The separation column 5 lowered into the well on a dual airlifting column 7, which nipple part 15 is connected with the clutch 13.

During descent and landing of the separation column 5 produce simultaneous cleaning of the wellbore due to the inclusion of dual airlifting column 7.

After planting the separation column 5 in the hole down the drilling tool through additional column 6, pre-moving drilling rig on the magnitude of the eccentricity and setting her coaxially with additional separation column 6.

Drilling of the intermediate zone wells produce direct flushing and pumping drill cuttings double airlifting column of the upper zone 7 via the flushing channel 12 additional separation columns 6.

Drilling to produce opening of the aquifer to the bottom of zone 2.

Prior to running production casing in the lower zone 4 pre-specify the installation location of the selective filter 9 (deaf or columns).

The production casing of the lower zone 4 is lowered into the well together with the selective filter 9 and double airlifting column 8. While rinsing the wells produced the usual inclusion of dual airlifting column 7.

After the descent of the production casing of the lower zone 4 and wash well down the cement pipe 11, cementing head 14 which is tightly installed in the retainer sleeve 10, produce the cementing of the intermediate zone wells, separation columns 5 and casing lower area 4.

Monitoring of cementation is performed by pumping double airlifting column 7, which previously disconnected from the coupling 13 and swinging in the separation column 4. Cementation is made up of the manifestation in the pumping fluid cement mortar.

After cementation remove cementing pipe 11 of the casing of the lower zone 4 lower drilling tools and produce drilling, opening aquifer of the lower zone 2 direct flushing and pumping drill cuttings is due to the inclusion of dual airlifting column 8, communicated with the production column of the lower zone 4.

After drilling the bottom of zone 2 is used to wash and pumping, according to the above scheme.

After pumping the drilling tool is removed from the casing of the lower zone 4 and the descent of pumping equipment for the operation, not shown. Drainage columns double airlifting columns 7, 8 during operation are used as observation is athelny.

Sources of information:

1. RF patent №2136856, MPK7 EV 43/14, 28.09.99.

2. USSR author's certificate No. 775298, EV 43/14, 30.10.80.

3. RF patent №2206723, EV 43/14, 21/00, 20.06.03.

1. Device for production from the two zones of the wells, including production casing upper and lower zones of the well, placed one within the other eccentric in the upper zone wells, dual airlifting the column installed in the upper zone wells, and double airlifting the column is in communication with the production column of the lower zone wells, separation column, mounted coaxially with the production column of the upper zone of the well and cementing the pipe, characterized in that the bore with considerable power unproductive areas it is equipped with an additional separation column with wash channels for draining it of drilling tools and drilling wells to the lower zone wells with pumping cuttings double airlifting column of the upper zone through the flushing channels, additional separation column placed coaxially with the production column of the lower zone wells and rigidly fixed to the separation column.

2. The device according to claim 1, characterized in that the double airlifting column, installed in the upper zone of the well, is connected to the additional separation column with the option of limiting the frame axial escapement rise.

3. The device according to claim 1, wherein the cementing pipe installed in the production string of the lower zone of the well and provided with a cementing head, and operational column of the lower zone of the well is equipped with an expansion coupling at the bottom.



 

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FIELD: oil and gas extractive industry.

SUBSTANCE: device has operation columns of upper and lower well zones, placed eccentrically one inside the other in upper zone of well, double airlift column, mounted in upper well zone, and double airlift column, connected to operation well of lower well zone, separation column, mounted coaxially to operation column of upper well zone, and cementation pipe. According to invention, in a well with significant power of non-productive zone it is equipped with additional separating column with cleaning channels for lowering drilling tool therein and drilling well to lower well zone with removal of drilling slurry by double airlift column of upper zone through cleaning channels. Additional separating column is combined coaxially with operation column of lower well zone and is rigidly fixed to separation column.

EFFECT: higher efficiency.

1 dwg, 3 cl

FIELD: mining industry.

SUBSTANCE: at least one pipes column is lowered into well with constant or variable diameter with or without plugged end, with at least one packer lowered below upper bed of hydraulic and/or mechanical effect with or without column separator. Below and above packer mounting assemblies are lowered in form of well chamber, or nipples with removable valve for feeding working agent through them respectively into lower and upper beds, mounting packer and pressing it from downwards and/or upwards. Minimal absorption pressure for each bed is determined during pressing. Working agent is pumped from mouth into pipes column hollow at given pressure, directing it into upper and/or lower beds through appropriate detachable valves in mounting assemblies. Total flow of working agent is measured on the surface as well as mouth pressure and/or temperature in pipes column hollow and behind-pipe well space. Face pressure of upper bed is determined as well as pressure in pipes column and behind-column space at depth of detachable valve in mounting assembly above the packer. Flow of working agent pumped into upper bed through detachable well is determined, subtracted from total flow and flow of working agent fed into lower bed is determined. Actual flows of working agent for beds are compared to planned values. In case of differences mouth pressure is changed ad/or detachable valves for one or more beds are extracted from mounting assemblies by rope gears. Their characteristics and/or parameters are determined and altered. After that each detachable valve is mounted again into appropriate mounting assembly by rope gears and pumping of working agent through them into appropriate beds is resumed.

EFFECT: higher efficiency.

25 cl, 11 dwg

FIELD: oil industry.

SUBSTANCE: device has body with solid wall in central channel and three rows of radial channels. Moving branch pipe is put on the body with a pin. It interacts with figured groove, placed on the body. Stepped cylinder is connected to the body, which by lower end enters a packer, and by upper end is stopped against a spring. It is mounted between end of cylinder and ring-shaped shelf of moving branch pipe. Dependently on position of moving branch pipe connection of behind-pipe space where pump is positioned, occurs to zone of upper or lower productive bed.

EFFECT: simplified construction, higher efficiency, higher reliability.

2 dwg

FIELD: oil industry.

SUBSTANCE: device has raising pipes column, flow distributor, upper and lower packers, each of which has body and elastic collar. Flow distributor is made in form of sub with longitudinal radial channels. Device has central pipe, connected to lower portion of sub. Channels and pipe connect inter-tubular space above upper packer to well shaft below lower packer. Each packer is provided with drift-bolt and support sleeve, into the latter from which its body enters with possible longitudinal displacement and connected to it by shear elements. Also provided is branch pipe, connected by upper end to supporting sleeve of upper packer, and by lower end - to intermediate pipe or pipes with detachable connection, connecting upper packer to lower one. Branch pipe is made with inner disconnecting ring and above it - with radial channels, connecting inner space of raising pipes through longitudinal channels of sub to well shaft between upper and lower packers. Lower end of central pipe enters disconnecting ring of branch pipe. Also provided is supporting pipe or pipes with filter, connected to supporting sleeve of lower packer.

EFFECT: simplified construction, higher reliability, higher durability.

2 dwg

FIELD: oil field development, particularly to obtain oil from a multiple-zone well.

SUBSTANCE: method involves drilling vertical and horizontal wells, injecting displacing agent and recovering product. Production horizontal and vertical wells and/or branched horizontal wells are drilled in zones having lesser average number of permeable intervals and greater reservoir part values and in formation junction zones of field to be developed. Injection wells present in above zone are used for oil production. Some production wells arranged along above zone border are used as injection ones along with previous highly-viscous liquid plug injection into high-porous formations to direct main liquid flow, namely oil and displacing agent, to horizontal wells.

EFFECT: increased oil recovery due to enlarged effective well bore length and due to increased inflow of oil displaceable from zones characterized by increased average number of permeable intervals to zones with high reservoir part values.

1 ex, 2 dwg

FIELD: oil field development, particularly obtaining oil from a deposit by flooding.

SUBSTANCE: method involves drilling injection and production wells; injecting liquid in wells and extracting product. Wells are drilled along with local valleys and projections investigating. Natural formation water directions are assigned as water flow direction from projections to valleys. Then formation permeability anisotropies created by above flow are determined. Peripheral and line injection wells are located in correspondence with natural formation water flow direction, namely at outer oil-bearing contour from natural formation water flow entering side. Intracontour well rows are additionally arranged substantially transversally to natural formation water flow direction. Production wells are drilled substantially transversally to natural formation water flow direction.

EFFECT: increased oil output due to improved high-permeable formation injectivity and decreased number of injection wells.

1 ex, 2 dwg

FIELD: oil and gas industry, particularly downhole equipment to be installed in oil and gas reservoirs.

SUBSTANCE: device comprises hollow body with discharge channels threadedly connected to flow string. The body is provided with shell having orifices and pressure nut. Spring, valve and replaceable head are arranged in annular gap between the body and the shell. The spring is installed between upper and lower support washers. The valve is located between upper support washer and shell ledge. The replaceable head is secured to the shell by means of pressure nut. Sleeve with orifices is coaxially installed inside the body between body extensions so that the sleeve may be displaced by wire-line equipment tool to misalign or align sleeve and shell orifices with discharge body channels.

EFFECT: provision of fluid flow from underlying reservoir to overlaying one.

2 cl

FIELD: oil and gas production industry, particularly methods or apparatus for obtaining oil, gas, water and other materials from multizone wells.

SUBSTANCE: device comprises packer with flow blocking means formed as hollow body with orifices located over and under sealing member of the packer. Pipe is arranged inside the body so that the pipe is concentric to body axis. Lower pipe end is connected to the body, upper part thereof cooperates with annular bush over outer pipe surface. Annular bush may move in axial direction and is provided with annular sealing means and with shear pins, which fixes the bush inside the body. After pin cutting annular bush moves downwards and closes body orifices located over sealing packer member to cut-off flow leaving orifices below sealing packer member.

EFFECT: extended water-free oil well operation period, increased oil recovery and reduced oil production costs due to elimination of water lifting charges and prevention of well bore zone contamination.

4 dwg

FIELD: oil industry.

SUBSTANCE: method comprises setting the jet pump into the well. The housing of the pump is provided with the central nozzle, openings for inflow of fluid, and radial passages. The openings for inflow of fluid are shut off by means of valving members. The jet pump is mounted between the top and bottom oil-bearing beds.

EFFECT: enhanced efficiency.

2 dwg

FIELD: oil production, particularly to produce watered oil and produced water utilization.

SUBSTANCE: pumping plant comprises pumps, which may be serially installed in well and provided with inlet and outlet means, drives and packer. Packer may be located inside well between beds. One bed is filled with oil-water mixture, another bed, namely lower one, is adapted for water receiving. Plant comprises screw pumps with drives installed on surface and polished shaft with gasket to connect worm shaft of upper pump with that of lower one. Lower screw pump has inlet means with radial orifices to receive water phase separated from oil-water mixture, as well as with slots. Lower pump comprises case, which defines channel for water injection into lower bed via above channel and through slots made in inlet means of lower pump during the same auger shaft rotation.

EFFECT: increased efficiency due to surface-driven screw pump usage.

3 dwg

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