RU2255211C1 - Well plant for bed-wise joint-separate feeding and extraction of liquid - Google Patents

Abstract

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

Description

The invention relates to the oil industry and is intended for the development and operation of relatively shallow reservoirs, namely, for pumping fluid into the lower reservoir and selecting products from the upper reservoir.

A known installation for the simultaneous separate development of several operational facilities, containing a column of lifting pipes with one or more packers. The installation is equipped with sections including a borehole chamber and a nipple with a flow control valve placed in them. The latter is made in the form of a flow differential pressure regulator or a fitting valve or as a removable double-acting regulator. The installation is additionally equipped with a pipe string (RF Patent No. 2211311, CL 7 E 21 B 43/14, 2003).

Disadvantages of installation:

the complexity of the design, due to the fact that it provides for the use of hanging packers, which, by using dies when used in old wells, can destroy the casing;

- the use of a two-column design, which dramatically increases costs and reduces the operational capabilities of the well;

- the inability to use downhole pumps.

The closest in technical essence to the proposed one is the equipment for jointly-separate injection and selection of fluid in the reservoirs, containing a column of lifting pipes, upper and lower packers, each of which includes a housing, an elastic cuff and a flow distributor (AS No. 1613587, class E 21 B 43/14, 1990).

The disadvantages of the device:

- the complexity of the design, and hence the high metal consumption;

- the presence of a tube (pos. 18) connecting the additional tank to the separation one complicates the installation of equipment in the well, especially in the horizontal one;

- the complexity in the sealing system, due to the use of cargo as a drive, which cannot be used at all in deviated and horizontal wells;

- the inability to ensure the tightness of the packers for a long time.

The objective of the invention is to create a simplified installation, characterized by simplicity in terms of installation and packaging, reliability and durability.

This problem is solved by the proposed installation for jointly-separate injection and selection of fluid in the reservoirs containing a column of lifting pipes, a flow distributor, upper and lower packers, each of which includes a housing and an elastic cuff.

New is that the flow distributor is made in the form of an adapter equipped with longitudinal channels, as well as radial channels and a central tube connected to the lower part of the adapter, communicating the annulus above the upper packer with the wellbore below the lower packer; each packer is equipped with a mandrel and a support sleeve, the last of which includes its body with the possibility of longitudinal movement and connected to it by shear elements; equipped with a pipe connected to the upper end with the support sleeve of the upper packer, and the lower end to the intermediate pipe or pipes with a detachable connection connecting the upper packer with the lower one, and the pipe is made with an internal disconnecting ring and above its radial channels communicating the inner space of the lifting pipes through longitudinal channels of the adapter with the wellbore between the upper and lower packers; the lower end of the central tube enters the uncoupling ring of the pipe; equipped with a support pipe or pipes with a filter connected to the support sleeve of the lower packer.

Figure 1 shows the proposed installation in longitudinal section, lowered into the well.

In Fig.2 - the same after packing during the operation of the well.

Downhole installation (figure 1) includes a flow distributor 1, made in the form of an adapter with radial 2 and longitudinal channels 3, which are not connected to each other.

The installation includes two packers: an upper and a lower one of a similar design and consist of a mandrel 4, a housing 5, an elastic sleeve 6 and a support sleeve 7. The housing 5 in the support sleeve 7 is mounted with the possibility of longitudinal movement and connected to it by shear elements 8. Below the support sleeve 7 of the upper packer there is a pipe 9, equipped with a disconnecting ring 10 from the inside with a seal 11 and radial channels 12. A central tube 13 is connected to the adapter 1 from below, and its lower end enters the disconnecting ring 10. The pipe 9 is connected to the intermediate pipe or pipes 14 with a detachable connection 15. The latter, in turn, are connected to the mandrel 4 of the lower packer, the support sleeve 7 of which is connected to the support pipe or pipes 16, equipped with a filter 17.

In the lifting pipes 18 above the flow distributor 1, a locking support for the plug-in deep pump (not shown) is installed.

The equipment of the installation on the lifting pipes 18 is lowered into the well so that the lower packer is higher than the lower reservoir, and the upper packer is higher than the upper reservoir, and the support pipe or pipes 16 with filter 17 abut against the bottom. The tool is unloaded, the shear elements 8 and 19, respectively, of the packers and detachable joints are destroyed, and the mandrel 4, under the influence of a vertical load, is lowered down to the stop of the annular ledges 20 in the lower part of the support couplings 7. In this case, the elastic cuffs 6 of the packers expand and tightly press against the walls of the casing 21.

The wellhead is sealed, a deep insertion pump is lowered into the lifting pipes 18 on the rods and water is pumped through the annular space through the radial channels 2 of the flow distributor 1, the central pipe 13, the intermediate pipe or pipes 14 and the support pipe or pipes 16 into the lower reservoir and production oil from the upper reservoir through the radial channels 12, the annular space 22 (figure 2) of the upper packer, the longitudinal channels 3 of the flow distributor and lifting pipes 18.

The proposed installation is much simpler in design than the known one. In this regard, its installation and packing are simplified. Dorning elements provide reliability and durability of sealing packer units.

Claims (1)

A downhole installation for jointly-separate injection and selection of fluid in the reservoirs, containing a column of lifting pipes, a flow distributor, upper and lower packers, each of which includes a housing and an elastic cuff, characterized in that the flow distributor is made in the form of an adapter equipped with longitudinal channels, as well as radial channels and a central tube connected to the lower part of the adapter, communicating annular space above the upper packer with the wellbore below the lower packer; each packer is equipped with a mandrel and a support sleeve, the last of which includes its body with the possibility of longitudinal movement and connected to it by shear elements; equipped with a pipe connected to the upper end with the support sleeve of the upper packer, and the lower end to the intermediate pipe or pipes with a detachable connection connecting the upper packer with the lower one, and the pipe is made with an internal disconnecting ring and above its radial channels communicating the inner space of the lifting pipes through longitudinal channels of the adapter with the wellbore between the upper and lower packers; the lower end of the central tube enters the uncoupling ring of the pipe; equipped with a support pipe or pipes with a filter connected to the support sleeve of the lower packer.

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