RU188083U1 - Overpack separator - Google Patents

Abstract

The proposal relates to the oil and gas industry, in particular to devices for separating, researching and treating formations in a well.

The over-packer divider includes a barrel equipped with radial channels and connected from above to the pipe string, and from below - a hermetic detachable connection to the packer, which is equipped with a central passage channel in communication with the under-packer space, and a spool, which is located inside the barrel with overlapping radial channels, is connected with it shear elements and is equipped with a landing saddle for waste from the mouth of the element. The spool is made with the possibility of limited downward movement along with the waste element after the destruction of the shear elements with the overlap of the message with the under-packer space and the opening of the radial channels of the barrel. The spool is equipped with an annular groove inside, and outside with a spring clip. The barrel below the spool is equipped with a groove under the spring clip to prevent movement of the spool. The throw element is made in the form of a separation plug equipped with a spring ring on the outside for interaction with the annular groove and fixation inside the spool, the inner diameter of which is made larger than the diameter of the geophysical equipment lowered into the well. The separation plug is made by the national team of the upper and lower parts, which are connected with the possibility of separation and extraction with the spring ring from the spool after lifting it to the surface.

The proposed overpacker separator allows you to perform geophysical studies both above and below the packer after installing it in the well, precise control of the injected reagents into the lower reservoir through the use of a separation plug and the expansion of functionality due to the possibility of separate production from the upper and lower reservoirs. 1 ill.

Description

The proposal relates to the oil and gas industry, namely, devices for separating, researching and treating formations in a well.

It is known "Device for regulating the injection of fluid into the reservoirs" (patent for PM RU No. 52098, IPC ЕВВ 43/20, publ. March 10, 2006 Bull. No. 7), containing a planting tool in the form of a pipe running on a pipe string, a packer including a mandrel and an elastic cuff, a throttling unit, including a nozzle with a fitting, a thrust pipe and a packer body rigidly connected to the mandrel, respectively, from above and below, as well as a support pipe connected by shear elements to the packer body, and the pressure pipe is provided with a hollow head with longitudinal pa on the side walls connecting the space of the well above and below the packer during the absence of fluid injection, in which the nozzle with the nozzle is mounted with the possibility of longitudinal movement, and the nozzle in the lower part is provided with a conical surface with a sealing collar interacting with an adequate conical surface of the thrust pipe located below the longitudinal grooves, while the pipe string at the lower end is provided with a valve connected in the transport position by means of shear screws in the working position When unloading the landing tool due to the action of the hollow head of the stop pipe with the valve, the support pipe inside is equipped with an annular protrusion that limits the axial movement of the packer body, and on top of the outer surface the support pipe is equipped with a cone, tapering from top to bottom, and from below closed by a curly groove with longitudinal short and long sections, moreover, a support clip with spring centralizers and a guide pin placed in a closed figured groove is mounted on the support pipe, while on both IU on its circumference slips mounted, spring-loaded in the radial direction and having the possibility of interaction with the support tube when the taper pin into the long section of a closed figure slot.

This device contains a separator in the form of a throttling unit made in the form of a nozzle with a fitting and a sealing collar, the lower part of the nozzle having a conical surface adequate to the conical surface of the hollow head.

The disadvantages of this separator are:

- the impossibility of passing geophysical equipment for descent into the under-packer space, since the throttling unit is located above, located on top of the packer is not passage;

- the inability to cut off the lower reservoir due to the design features of the throttling unit;

- structural complexity of the throttle assembly.

Also known is the “Drillable packer for cyclic injection of solutions into the reservoir” (patent RU No. 2435019, IPC EVB 33/12, publ. 11/27/2011 Bull. No. 33), including a hydraulic cylinder with a lower stop, a piston with an adapter at the top, upper and lower rods , the last of which is made with radial channels and rigidly connected through a tip having technological holes and telescopically inserted directly into the deformable sleeve and secured in the transport position with a shear screw to the lower stop, with a perforated nipple, sealing unit, incl. cuff, deformable sleeve and mandrel with an expanding angle at the top, connected in the lower part by means of a nozzle through a shear ring with a tip and a perforated nipple, which is telescopically mounted in the mandrel, equipped with outer cylindrical sections separated by a groove with a chamfer at the bottom, cutting off the valve and the plug with an annular a sample for fixing in the nozzle with a retaining ring, and the shut-off valve is made in the form of a tube with an outer ring sample, hermetically inserted into the tip and fixed pores that are inserted into the technological openings of the tip with the possibility of limited movement outward when the shear ring is broken and the mandrel passes, and also with the possibility of interacting in the transport position from the inside with the annular cork sample, and from the outside with the mandrel, while the upper rod above the piston is equipped with an outer annular a groove, and the cylinder sub in the upper part is equipped with an internal sample with a spring ring configured to interact with the annular groove of the upper rod and fix cherries in the highest position, with the upper chamfer being made on the retaining ring of the nozzle, and the ring sampling of the stub provided with a bevel on top of the upper chamfer of the nozzle retaining ring.

The separator is installed at the bottom and is made in the form of a shut-off valve and a plug with an annular sample for fixing in the packer nozzle by a retaining ring, and the shut-off valve is made in the form of a tube with an external annular sample, hermetically inserted into the tip and fixed by stoppers that are inserted into the technological holes of the tip limited outward movement during the destruction of the shear ring and the mandrel, as well as with the possibility of interaction in the transport position from the inside with the ring a cork, and on the outside with a mandrel, with the upper chamfer being made on the retaining ring of the nozzle, and the annular sampling of the stub provided with a bevel on top of the upper chamfer of the nozzle retaining ring.

The disadvantages of this separator are:

- the inability to pass the geophysical equipment for descent into the under-packer space below the perforation of the nipple due to the presence of a blind plug;

- uncontrolled injection of reagents under the packer, only due to control of fluid flow, which can lead to dilution of reagents with squeezing liquid due to the failure of control devices or due to an error of the worker performing the injection.

- fixing the plug when cutting off the lower layer is not reliable (for extrusion), which can lead to its unauthorized opening when the division jump above the packer.

The closest in technical essence is the “Device for treating formations in the well” (patent for PM RU No. 35821, IPC ЕВВ 33/12, published on 02/10/2004 Bull. No. 4), containing a packer including a housing and an elastic cuff, disconnector, including a barrel provided with radial channels and a spool, wherein the packer body is made upstream and provided with a bypass valve from the bottom to the bottom, and radial channels are made in the lower part of the body communicating the inside of the packer with a sub-packer space, moreover hoschita is located inside its trunk and connected to it by shear elements, equipped with a seating seat for a ball discharged into the device before processing the second layer, the upper part of the disconnector barrel is provided with an emphasis on the outside, except for which shear elements connected to each other and forming a hydraulic chamber sleeve are installed on its outer surface and a tip, and the tip below is abutted against the bottom, and tightened by the sleeve from above.

The separator is played by the disconnector.

The disadvantages of this separator are:

- the inability to pass the geophysical equipment for descent into the under-packer space below the radial channels of the barrel due to the presence of the lower valve;

- uncontrolled injection of reagents under the packer, only due to control of fluid flow, which can lead to dilution of reagents with a squeezing liquid due to the failure of control devices or due to an error of the worker performing the injection;

- it is impossible to extract from the upper layer, since the throwing ball in the spool passes from top to bottom.

The technical task of the proposed utility model is to create an over-packer separator that allows performing geophysical studies both above and below the packer after installing it in the well, precise control of injected reagents into the lower reservoir through the use of a separation plug and expansion of functionality due to the possibility of separate production from upper and lower layers.

The technical problem is solved by an overpacker separator, including a barrel equipped with radial channels and connected from above to the pipe string, and from below - to a packer, which is equipped with a central passage channel in communication with the under-packer space, and a spool, which is located inside the barrel with overlapping radial channels, is connected to it with shear elements and is equipped with a landing saddle for the element thrown from the mouth, the spool being made with the possibility of limited downward movement with the thrown element after destruction shear elements with overlapping messages packer space and the opening of the radial bores.

What is new is that the barrel is sealed with a packer, the spool is provided with an annular groove inside and the spring retainer on the outside, the barrel is equipped with a spring groove below the spool to prevent the spool from moving, and the throw element is made in the form of a separation plug equipped with an external spring ring for interaction with the annular groove and fixation inside the spool, the inner diameter of which is made more than the diameter of the geophysical equipment lowered into the well, This isolation tube is made of modular upper and lower parts releasably soedinennyhs and extracting with a spring ring of spool after lifting it to the surface.

The drawing shows a diagram of an overpack separator.

The over-packer divider includes a barrel 1 provided with radial channels 2 and connected from above to the pipe string 3, and from below - a hermetic detachable connection 4 to the packer 5 (only the upper part is shown), which is equipped with a central passage channel 6 in communication with the under-packer space (not shown), and the spool 7, which is located inside the barrel 1 with the overlap of the radial channels 2, is connected to it by shear elements 8 and is equipped with a landing seat 9 for the outflow from the mouth of the element 10. The spool is made with the possibility of limited downward movement relative to the barrel 1 together with the throwing element 10 after the destruction of the shear elements 8 with the overlap of the message with the under-packer space and the opening of the radial channels 2 of the barrel 1. The spool 7 is provided with an annular groove 11 inside and the spring clip 12 outside. The barrel 1 below the spool 7 a groove 13 under the spring clip 12 to prevent movement of the spool 7 relative to the barrel 1 after interaction. The throw element 10 is made in the form of a separation plug equipped with an external spring ring 14 for interacting with the annular groove 11 and fixing inside the spool 7, the inner diameter D of which is made larger than the diameter of the geophysical equipment lowered into the well (not shown). The separation plug 10 is made of a team of upper 15 and lower 16 parts connected with the possibility of separation and extraction with a spring ring 14 from the spool 7 after lifting it to a surface (not shown).

The authors do not claim to design the packer 5 and how to install it, since there are many such packers from open sources.

The tight connection 4 of the barrel 1 with the packer 5 can be one-piece (thread, welding, pressing, etc.) with a single exposure and detachable (left-hand thread, spring clip, auto-release, etc.) for the type of connection4 and disconnection, the authors do not claim , since many such compounds are known from open sources. In principle, only connection 4 with the left thread will be described for clarity.

The connection of the upper 15 and lower 16 parts of the separation plug 10 can be carried out using threads 17, spring clips, press fit, etc. (not shown). In principle, operation will be described for clarity, only the connection of 17 parts 15 and 16 using a thread.

O-rings that exclude unauthorized fluid flows are shown, shown, but not numbered, since they do not affect the performance of the separator.

Structural elements that do not affect the performance of the overpack separator are not shown or shown conditionally.

The overpack separator works as follows.

A spool 7 is installed in the barrel 1 and fixed with shear elements 8. The packer 5 is assembled and connected to the barrel 1 by connecting 4. A pipe string 3 is attached to the thread 18 of the barrel 1, on which the complete assembly is lowered into the well in the installation interval (not shown) packer 5 - between layers (not shown). Packer 5 seals the annulus (not shown) of the well. From the sub-packer space of the borehole, through the pipe string 3 through the central passage channel 6 of the packer 5, products are produced (not shown when the pump is launched) or liquid is pumped, including reagents. To study the properties of the formation (or layers) located under the packer 5, the necessary geophysical equipment (flow, pressure, temperature, etc. sensors) is lowered into the sub-packer space through the pipe string 3, since the inner diameter D of the spool 7 is made larger than the diameter of the geophysical equipment lowered into the well. If it is necessary to switch to the upper layer (not shown), a separation plug 10 is thrown into the pipe string 3. And if it is necessary to pump reagents into the lower layer before switching, the required volume of reagents is pumped into the pipe string 3 (the applicants do not pretend for reagents and methods of injection), which separation plug 10. Under the action of the wellhead pressure generated by the pump unit (not shown), the separation plug 10 with or without reagents descends along the pipe string 3 and sits in the saddle 9, sealing it internally its space, which increase the injection pressure is fixed at wellhead pressure indicator (not shown). In this case, the spring ring 14 of the plug 10 interacts for fixation with the annular groove 11 of the spool 7. With this injection of reagents, they are not allowed to mix with squeezing liquid, and the required amount of reagents is pumped into the lower layer. At the mouth, the pressure is increased by the pump unit, as a result, the shear elements 8 are destroyed, and the spool 7 with the plug 10 moves down the barrel 1 until it interacts with the upper end of the packer 5 and the spring clip 12 with the groove 13 of the barrel 1. The radial channels 2 of the barrel 1 open , allowing the production and processing of the upper layer through the overpacker space (not shown). The opening of the radial channels 2 is fixed by lowering the injection pressure on the wellhead pressure indicator.

Upon completion of the work with the packer space with a single use, the packer 5 is removed and the complete assembly is removed to the surface. The barrel 1 is disconnected by thread 18 from the pipe string 3 and by connection 4 from the packer 5, the spool 7 is pushed out of the barrel 1 by a press or other pressing tool. The upper 15 and lower 16 parts of the separation plug 10 (for example, by thread 17) are disconnected from the spool 7 from different sides, after which the spring ring 14 (if any, with the process hollow cone 19) is removed from the spool 7. Produce revision of all elements of the overpack separator, if necessary, replace with new ones. Over packer is ready for use in other wells ..

With repeated use, the barrel 1 is disconnected by connection 4 from the packer 5 by rotation and the over-packer disconnector is removed on the surface pipe string 3. The barrel 1 is disconnected by thread 18 from the pipe string 3, the spool 7 is pushed out of the barrel 1 by a press or other pressing tool. The upper 15 and lower 16 parts of the separation plug 10 are disconnected from each other, after which the spring ring 14 (if any, with the technological hollow cone 19) is removed from the spool 7. All elements of the overpack separator are inspected if necessary and replaced with new ones. A spool 7 is installed in the barrel 1 and fixed with shear elements 8. A spring catcher (collet, retaining ring, etc. - not shown) with centering and sealing elements (outer or end seals - not shown) is connected to the spool 4. The authors do not pretend to the design of the catcher and its centering and sealing elements.

A string of pipes 3 is attached to the thread 18 of the barrel 1, on which the complete assembly is lowered into the well until the catch is tightly connected with the connection 4 of the packer 5. Further work with the under-packer and over-packer spaces of the well is described above.

If it is necessary to process once again the sub-packer space after installing the separation plug 10 in the spool 7, the catch is separated by rotation from 4 packers 5 and the design of the over-packer separator with the catch is removed to the surface. The work on revising the elements of the disconnector and preparing for the second descent is described above.

If it is necessary to extract, after repeated treatments of the above-packer and under-packer spaces of the well, the packer 5 is removed and the structure assembled with the catcher is removed to the surface. The barrel 1 is disconnected by thread 18 from the pipe string 3 and by connection 4 from the catcher, the spool 7 is pushed out of the barrel 1 by a press or other pressing tool. The upper 15 and lower 16 parts of the separation plug 10 are disconnected from each other, after which the spring ring 14 (if any, with the technological hollow cone 19) is removed from the spool 7. All elements of the over-packer separator are inspected, if necessary, replaced with new ones. The overpack separator is ready for use in other wells.

The proposed overpacker separator allows you to perform geophysical studies both above and below the packer after installing it in the well, precise control of the injected reagents into the lower formation through the use of separation plugs and enhanced functionality due to the possibility of separate production from the upper and lower layers.

Claims (1)

An over-packer divider including a barrel equipped with radial channels and connected from above to the pipe string and from below to a packer, which is equipped with a central passage channel in communication with the under-packer space, and a spool, which is located inside the barrel with overlapping radial channels, is connected with shear elements and is equipped with a landing seat for a waste element from the mouth of the element, the spool being made with the possibility of limited downward movement with the waste element after the shear elements are destroyed from being closed communication with the under-packer space and the opening of the radial channels of the barrel, characterized in that the barrel is connected by a hermetic detachable connection to the packer, the spool is provided with an annular groove inside and the spring retainer on the outside, the trunk is equipped with a groove under the spring retainer to prevent the spool from moving, and the element is made in the form of a separation tube, equipped with a spring ring on the outside for interaction with the annular groove and fixation inside the spool, the inner diameter of which cook longer diameter geophysical equipment lowered into the well, wherein the isolation tube is made from a team top and bottom parts connected releasably and extract with spring ring of spool after lifting it to the surface.

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