Device for production from the two zones of the well

 

The invention relates to the field of extraction fluid and mineral resources of the two producing horizons, in particular aquifer, one well and can also be used in the extraction of mineral waters in the oil and gas industry. Device for production from the two zones of the well includes a casing, placed one within the other in the upper zone of the well, forming a production casing of the upper zone and the production casing of the lower zone. The device is equipped with a separation column, an intermediate cementing pipe, intermediate drainage column and air pipe. The separation column and the intermediate cementing pipe communicated with the upper zone wells intermediate drainage column. The air pipe is connected with an intermediate drainage column, forming an intermediate double airlifting column, which is communicated with the production column of the lower zone. The invention provides a highly efficient production, reliable isolation and separation of the two productive zones of the well and control during operation. 4 C.p. f-crystals, 2 Il.

The present invention relates to the field of drilling and production fluid poleznye also when 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.

To combat the absorption of drilling fluid from the drill cuttings known method of drilling using intermediate air pipe [1].

The disadvantage of this technology is that the intermediate pipe is in communication with the casing pipe and compressed air is supplied into the internal cavity of her and due to the large area of annular cross section between the drill and casing strings, the lifting speed of the pulp from well minor and do not provide removal of large parts Cherednychenko for use in the separate flow of fluid, extracted from lateral wells.

This system is highly efficient for the drainage of some formations, but it has the disadvantage that the produced fluids mixed together in the parent casing.

Also known system complete wells [3]. 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.

In addition, a device for equipment wells [4], 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 wells, as well as the known device is intended to be constructed is to create a device for drilling and production from two zones of the well, which provides high-performance drilling, reliable separation and separate operation of two 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 well, comprising a casing, placed one within the other in the upper zone of the well, forming a production casing of the upper zone and the production casing of the lower zone, and it is provided with a separation column, an intermediate cementing pipe and communicated with the upper zone wells intermediate drainage column and connected with it by an air pipe, forming an intermediate double airlifting the column is in communication with the production column of the lower zone.

In addition, operating column of the lower zone is positioned relative to casing upper zone of the eccentric, and drainage columns rigidly fixed thereto and is made as centralizers during the descent of the column in the well and as guides for lowering the intermediate cementing pipe and pumping equipment.

Also the drainage tube is made as observant.

As well as the separation column is made in between the waiting areas in the impermeable portion of the well bore and provided with a lower chamber with the receiving pipe and the sump, and the upper filter zone is made selective and eccentrically positioned with respect to a casing of the lower zone.

The invention is illustrated by drawings. In Fig.1 gives a General view of the device of Fig.2 is a top view.

The well consists of two productive zones, the upper 1 and lower 2.

The upper area is planted at the top of the well production column 3, the lower zone production column 4, posted by eccentric relative to column 3.

By operating the column 4 are connected to the eccentric separation column 5, installed in the waterproof part of the well bore and provided with a bottom chamber 6 a foster nozzle 7 and the sump 8.

To the column 4 is rigidly connected to the drain columns 9, 10, and it is connected to the air pipe 11, 12.

The device is also equipped with an intermediate cementing pipe 13 made with the centering device 14. Drainage columns 9, 10 is positioned relative to the column 4 is based, to serve as centralizers during the descent into the well and as guides during the descent cementing pipe 13 and pumping equipment, not shown. To the column 4 is rigidly connected to the filter 15 is installed in the fractured part of the upper zone of the well.

After drilling, install and grouting column 3 reveal aquifer zone 1 and the same diameter rock cutting tool drilling continues in the waterproof part of the wellbore prior to the opening of the lower production zone 2.

After drilling down column 4 together with secured thereto nodes, including the filter 14, if in the process of drilling were dissected fractured and collapsing part of the wellbore.

During the descent of the column 4 are performed simultaneously cleaning the wellbore due to the compressed air in the air pipe 12 and pumping slurry through the drain pipe 10.

After planting the column 4 at the bottom of the upper zone 1 is the cementation of the separation column 5. For this lower cementing a pipe 13 to the pipe 7, using the guides 9, 10 and the clamp 14, and is fed under pressure cement slurry into the chamber 6, and out into the annulus of the separation column 5.

After cementing the separation column 5 remove cementing pipe 13 and produce a final flushing and pumping the ons wells simultaneously commence drilling in the productive zone 2. Used for this purpose is a rotary drilling tool with a flow of washing fluid on the bottom, not shown.

Thus, as drilling fluid pumped fluid from the upper zone 1 wells, and for lifting cuttings include airlifting system 10, 12.

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 column 4 and the descent of pumping equipment for the operation, not shown. Drainage columns 9, 10 during operation are used as the observation.

Sources of information 1. Murray J. W. Parasite Tubing string solves lost-circulation problem Oil and Gas J. 66, 22, 1968, p. 87-90.

2. US 5462120 AND 31.10.95.

3. RF patent 2136856, MPK7 E 21 IN 43/14, 28.09.99.

4. USSR author's certificate 775298, E 21 In 43/14, 30.10.80.

Claims

1. Device for production from the two zones of the well, comprising a casing, placed one within the other in the upper zone of the well, forming a production casing of the upper zone and the production casing of the lower zone, characterized in that it is provided with a separation column, an intermediate goals with her air pipe, forming an intermediate double airlifting the column is in communication with the production column of the lower zone.

2. The device under item 1, characterized in that the operation column of the lower zone is positioned relative to casing upper zone of the eccentric, and drainage columns rigidly fixed thereto and is made as centralizers during the descent of the column in the well and as guides for launching cementing pipe and pumping equipment.

3. The device under item 1 or 2, wherein the separation column is made in the form of intermediate casing eccentrically positioned with respect to a casing of the lower zone, provided the bottom of the camera with the receiver pipe and the sump and installed between the impermeable zones in the well.

4. The device under item 1 or 2, characterized in that the drain tube is made as observant.

5. The device under item 1 or 2, characterized in that the upper filter zone is made selective and eccentrically positioned with respect to a casing of the lower zone.

 

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2 dwg

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