RU2790622C1 - Dual tubing installation for selective completion of two reservoirs by one well - Google Patents

Abstract

FIELD: tubing production.

SUBSTANCE: dual tubing installation for selective completion of two reservoirs by one well includes the main and additional drives. The installation contains a packer installed between the upper and lower reservoirs. The installation includes main tubing string, connected with the below-packer space of the well, and additional tubing string, connected with the behind-the-packer space of the well, tubing strings are with rod pumps. The tubing strings are fixed to the wellhead with double-hole fittings. A parallel anchor is installed on the main tubing string. Below the parallel anchor, at the inlet of the additional tubing string, there is a sand anchor with a tubing container and a spherical plug. The spherical plug has a thread in the upper part for connection to the tubing of the container and its sealing for the mechanical impurities accumulation. The parallel anchor is made in the form of a hemicylindrical body with a longitudinal channel that provides fixation of the main tubing string. A longitudinal hemispherical groove with rounded corners is made on the inner surface of the parallel anchor.

EFFECT: simplification of the design and enhancement of the reliability of the dual tubing installation for selective completion of two reservoirs by one well, protection against clogging by mechanical impurities, maintenance simplification, elimination of possibility of twisting an additional tubing string, reduction of the repair duration.

1 cl, 2 dwg

Description

The invention relates to the oil industry, and in particular to the production of oil during the simultaneous-separate operation of two layers by one well under conditions complicated by the removal of mechanical impurities from the upper productive layer.

A two-lift installation is known for the simultaneous separate operation of two reservoirs by one well in conditions complicated by the removal of mechanical impurities from the upper productive reservoir (patent RU No. 181346, IPC E21B 43/14, 43/08, publ. including the main and additional drives, a packer installed between the upper and lower productive strata, the main one, which communicates with the under-packer space of the well, and the additional one, which communicates with the above-packer space of the well, tubing strings with rod pumps fixed at the wellhead with double-barreled fittings, a parallel anchor, installed on both columns of the lift pipes and made with the possibility of fixing them relative to each other. At the same time, the bottom of the additional column of lift pipes between the rod pump and the parallel anchor is equipped with a branch pipe with filtration holes, two or three tubing pipes acting as a sludge collector, and a plug in the form of a disk installed in the coupling joint.

The disadvantages of the installation are:

- difficulty in maintaining the device associated with the parallel anchor design used, leading to additional operations (docking, undocking) with an additional (short) column of lift pipes during underground repairs, which in some cases lead to emergency situations;

- low performance and reliability of the device associated with mechanical impurities clogging the rod pump, which extracts products from the upper horizon, and its decommissioning. A branch pipe with filtration holes does not provide reliable protection against small mechanical impurities, which make up the main part of the impurities carried out from the reservoir, which lead to failure of the rod pump units. Reducing the size of the filtration holes of the branch pipe will lead to a rapid clogging of the holes with large mechanical impurities and a decrease in the feed rate of the rod pump, oil losses and a decrease in the efficiency of the installation. It is impossible to equip an additional (short) column of lift pipes with additional equipment below the anchor (for example, a liner, gas-sand anchor, etc.).

A two-elevator installation is known for the simultaneous-separate operation of two layers by one well for conditions complicated by the content of mechanical impurities and free gas in the production of the upper object (patent RU No. 209245, IPC E21B 43/14, publ. 08.02.2022, bull. No. 4), including the main and additional drives, a packer installed between the upper and lower productive strata, the main one, which communicates with the under-packer space of the well, and the additional one, which communicates with the above-packer space of the well, tubing strings with rod pumps fixed at the wellhead with double-barreled fittings, a parallel anchor. Parallel anchor is installed on both columns of lift pipes and is made with the possibility of fixing them relative to each other. The additional column of lift pipes is equipped with a branch pipe with filtration holes, two or three tubing pipes acting as a sludge collector, and a plug in the form of a disk installed in the coupling joint. As a downhole pump of the additional column, an insert rod pump with an upper attachment of the lock support is used, and a pipe with filtration holes is installed directly below the lock support, the suction of the plug rod pump is additionally equipped with a through pipe 0.5 m long and with an outer diameter smaller than the outer diameter of the plug pump cylinder, moreover, the distance from the lower filtration holes to the bottom of the through pipe is at least 3 m;

The disadvantages of the installation are also:

- difficulty in maintaining the device associated with the parallel anchor design used, leading to additional operations (docking, undocking) with an additional (short) column of lift pipes during underground repairs, which in some cases lead to emergency situations;

- low performance and reliability of the device associated with mechanical impurities clogging the rod pump, which extracts products from the upper horizon, and its decommissioning. A branch pipe with filtration holes does not provide reliable protection against small mechanical impurities, which make up the main part of the impurities carried out from the reservoir, which lead to failure of the rod pump units. Reducing the size of the filtration holes of the branch pipe will lead to a rapid clogging of the holes with large mechanical impurities and a decrease in the feed rate of the rod pump, oil losses and a decrease in the efficiency of the installation. It is impossible to equip an additional (short) column of lift pipes with additional equipment below the anchor (for example, a liner, gas-sand anchor, etc.);

- limited functionality of the device associated with the use of only a plug-in rod pump that produces products from the upper object, which does not allow the use of a rod pump with a plunger diameter of 44 mm or more due to the limitations of the standard size of the tubing string (48 or 60 mm) for two-lift installations, as well as the installation of a sludge collector above the parallel anchor, which leads to the need to reduce the suspension depth of the rod pump, which extracts products from the upper object, which also limits the functionality of the installation, since, on the contrary, it is necessary to lower the rod pump to ensure maximum fluid withdrawal and oil production deeper, i.e. closer to the top of the formation.

The closest to the proposed technical essence is the installation for the simultaneous-separate operation of two layers (patent RU No. 72720, IPC E21B 43/14, publ. 27.04.2008, bull. No. 12), including the main and additional drives, a packer installed between upper and lower productive formations, the main one, which communicates with the under-packer space of the well, and the additional one, which communicates with the above-packer space of the well, tubing strings with rod pumps fixed at the wellhead with double-barreled fittings, a parallel anchor installed on the main tubing string. Parallel anchor is installed on both columns of lift pipes and is made with the possibility of fixing them relative to each other. SUBSTANCE: double-barrel fittings contain a flange with wellhead seals provided with holes for fastening to the wellhead; a pipe holder of the main production pipes equipped with a thread; flange channel. At the same time, the pipe holder of the main lift pipes of the double-barreled fittings is made in the form of a thread directly from the bottom of the flange. Sealing heads can be made in various heights relative to the flange, and the main and auxiliary drives can be mounted respectively on bases of various heights to simplify their installation and adjustment. The additional lift pipes may be configured to be detachable from the parallel armature by tension in a clockwise direction. The glands of the sealing heads can be equipped with a swivel, allowing them to deviate from the vertical during installation and operation of the drives. The packer can be made with the possibility of fixing and tensioning the main lift pipes.

The disadvantages of the installation are:

- difficulty in maintaining the device associated with the parallel anchor design used, leading to additional operations (docking, undocking) with an additional (short) column of lift pipes during underground repairs, which in some cases lead to emergency situations;

- low performance of the device associated with clogging of the sucker-rod pump producing products from the upper horizon with mechanical impurities and its decommissioning due to the impossibility of lowering additional equipment below the anchor on an additional (short) column of lift pipes (for example, a liner, gas sand anchor, etc.) .

The technical objectives of the claimed utility model are to simplify the design and increase the reliability of the two-lift installation for the simultaneous separate operation of two reservoirs by one well, which provides protection against clogging by mechanical impurities of the sucker rod pump that extracts products from the upper object, as well as to simplify maintenance by the possibility of rigid fixation of only the main column of lift pipes , elimination of twisting of the additional tubing string around the main tubing string during operation of the rod pump, reducing the repair time due to the elimination of operations for docking and undocking of the additional tubing string with a parallel anchor.

Technical problems are solved by a two-elevator installation for simultaneously separate operation of two layers by one well, including the main and additional drives, a packer installed between the upper and lower productive layers, the main one, which communicates with the under-packer space of the well, and an additional one, communicated with the above-packer space of the well, tubing strings with rod pumps fixed at the wellhead with double-barrel fittings, a parallel anchor mounted on the main string of tubing.

What is new is that below the parallel anchor at the reception of an additional column of tubing, a sand-proof anchor with a container of tubing and a spherical plug is installed, the spherical plug has a thread in the upper part for attaching to the tubing of the container and sealing it to accumulate mechanical impurities , the parallel anchor is made in the form of a semi-cylindrical body with a longitudinal channel that provides fixation of the main column of lift pipes, while on the inner surface of the parallel anchor there is a longitudinal hemispherical groove with rounded corners, and the upper wall is made at a slope, providing direction when lowering the additional column of lift pipes.

In FIG. 1 shows a diagram of the proposed two-lift installation.

In FIG. 2 shows a diagram of the parallel armature of the proposed two-lift installation.

A two-elevator installation for simultaneously separate operation of two layers by one well consists of a main 1 and an additional 2 drives, a packer 3 installed between the upper 4 and lower 5 productive layers, the main 6, which communicates with the under-packer space of the well, and the additional 7, which communicates with the above-packer space of the well , strings of lift pipes with rod pumps 8 and 9, fixed at the wellhead with double-barrel fittings 10, a parallel anchor 11, installed on both columns of lift pipes 6 and 7.

Below the parallel anchor 11, at the inlet of the additional column of lift pipes 7, a sand-proof anchor 12 is installed with a container 13 and a spherical plug 14. As a container 13, tubing with a nominal diameter equal to the diameter of the additional column of lift pipes 7 is used. The spherical plug 14 has a thread in the upper part for connection to the tubing of the container 13 and its sealing for the accumulation of mechanical impurities. Such equipment of the additional column of lift pipes 7 with an anti-sand anchor 12 provides protection against clogging by mechanical impurities of the rod pump 9, which extracts products from the upper object 4, and the spherical plug 14 reduces the risk of an accident or complications when lowering the additional column of pipes 7 as a result of the stop or jamming of the plunger in the cylinder pump 9.

Parallel anchor 11 is made in the form of a semi-cylindrical body with a longitudinal channel 15, which provides fixation of the main column of lift pipes 6.

At the same time, on the inner surface 16 of the parallel anchor 11, a longitudinal hemispherical groove 17 with rounded corners is made, and the upper wall 18 is made at a slope, providing direction when lowering an additional column of lift pipes.

For the upper wall 18 of the parallel anchor 11 take the wall closest to the wellhead.

The parallel anchor 11 is rigidly fixed on the main tubing string 6. The absence of rigid fixation from the additional tubing string 7 makes it possible to equip the additional tubing string 7 with equipment for protection against mechanical impurities, as well as to exclude operations for docking and undocking the additional tubing string 7 with parallel anchor 11, which reduces the duration of repairs, eliminates emergencies.

The upper wall 18 of the parallel anchor 11 guides an additional column of lift pipes 7 during the descent.

Two-lift installation for simultaneous separate operation of two layers by one well operates as follows.

During the operation of sucker-rod pumps 8 and 9, the produced liquid rises separately along the columns of lift pipes 6 and 7 due to the presence of a packer 3 separating layers 4 and 5.

The downhole fluid from the formation 4 enters the sand control anchor 12, in which due to the gravitational effect, when the flow direction changes, mechanical impurities are separated into the container 13. After that, the purified fluid enters the pump 9 and then rises to the collection system through an additional column of lift pipes 7.

The proposed design of a two-elevator plant for the simultaneous separate operation of two reservoirs by one well is simple, reliable, provides protection against clogging by mechanical impurities of a rod pump that produces products from the upper object, and also simplifies maintenance by the possibility of rigid fixation of only the main tubing string, eliminates twisting of the additional tubing string. pipes around the main tubing string during operation of the sucker rod pump, reduces the repair time due to the elimination of operations for docking and undocking an additional tubing string with a parallel anchor.

Claims (1)

Two-elevator installation for simultaneous separate operation of two layers in one well, including the main and additional drives, a packer installed between the upper and lower productive layers, the main one, which communicates with the under-packer space of the well, and an additional one, which communicates with the above-packer space of the well, strings of lift pipes with sucker rod pumps , fixed at the wellhead with double-bore fittings, a parallel anchor installed on the main tubing string, characterized in that below the parallel anchor at the intake of the additional tubing string, a sand-proof anchor with a container of tubing and a spherical plug is installed, the spherical plug has in the upper part of the thread for attaching to the tubing of the container and sealing it for the accumulation of mechanical impurities, the parallel anchor is made in the form of a semi-cylindrical body with a longitudinal channel that provides fixation of the main column of the elevator x pipes, while on the inner surface of the parallel anchor there is a longitudinal hemispherical groove with rounded corners, and the upper wall is made at a slope, providing direction when lowering an additional column of lift pipes.

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