RU2517294C1 - Device for dual injection operation to two formations of same well (versions) - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device is mounted at the flow string and contains a hanger with two packers. In the hanger cavity there are at least two collars with a hermetical cup installed in collars; the cup is made with a thrust to a butt end protrusion of the hanger and this protrusion has longitudinal channels that form an annular space. In the cup wall at both sides of the lower collar there are two units with calibrated flow sections communicating the cup cavity with the upper well formation through the upper union, the annular space between collars and windows made in the hanger wall at one side and with the lower well formation through the lower union, the annular space below the collars and longitudinal channels of the butt end protrusion at the other side.

EFFECT: ensuring quick injection of the planned volumes of liquid to the well formations having different injectibility.

5 cl, 5 dwg

Description

The invention relates to the field of mining, in particular to equipment for the operation of oil wells, and can be used for simultaneous-separate and sequential injection of fluid into two layers of one well.

A known installation for simultaneously separate injection and production from a multilayer reservoir through one well, including an injection pipe string with one packer, lowered onto the lower formation, and a production pipe string equipped with a rocking machine and a deep pump, lowered onto the upper formation in parallel next to the injection column pipes (Patent RU No. 63436 U1 for utility model. Installation for simultaneous and separate injection and production from a multilayer reservoir through one well. - IPC: Е21В 43/14. - 05.27.2007).

A known installation for simultaneous and separate injection of water into two layers through one well, including double-barrel wellhead fittings, packers installed above the upper layer and between the upper and lower layers, and rigidly connected to the main column of elevator pipes in communication with the lower layer, and an additional column elevator pipes, placed in the well parallel to the main one, connected by a two-channel anchor with a movable joint, self-sealing from bottom to top and working from abutment under it under the weight of the columns of elevator pipes (Paté m RU №2349739 C1 for the invention apparatus for dual injection water into two layers - IPC:.. E 21 B 43/14 - 20.03.2009)..

A known installation for simultaneous and separate injection of water into two layers through one well, including double-barrel wellhead fittings, a packer installed between the upper and lower layers, the main column of elevator pipes in communication with the lower layer, and an additional column of pipes placed in the well parallel to the main, connected to it by a two-channel anchor (Patent RU No. 79616 U1 for utility model. Installation for simultaneous and separate injection of water into two layers. - IPC: Е21В 43/20. - 10.01.2009).

A known installation for simultaneous and separate injection of fluid into two layers of the well, including a two-channel wellhead, a packer installed between the upper and lower layers, the main pipe string in communication with the lower formation, an additional pipe string placed in the well parallel to the main, and a two-channel anchor between two columns, in which the channel for the main column, made in the form of a coupling with internal threads, and the channel for the additional column is smooth so that the additional column is not fixed in the anchor s pipe anchor has a bevelled upper portion and made of a material legkorazburivaemogo (Patent RU №84458 U1 Utility Model Installation for dual injection water into two layers - IPC:.. E 21 B 43/00 - 10.07.2009.).

A known installation for simultaneous and separate production and injection through one well, containing a drive, a pump, a string of pump rods, two columns of tubing of various lengths, a parallel two-channel anchor, wellhead fittings and a packer for separating the layers. A ground drive of a screw rod pump was used as a drive for rotation of the pump rod string, and a screw rod pump was used as a pump (Patent RU No. 844461 U1 for utility model. Installation for simultaneous and separate production and injection through one well. - IPC: Е21В 43 / 14. -10.07.2009).

It is known equipment for simultaneous-separate injection of water into two layers through one well, including wellhead fittings with a lubricator, into which a pusher is inserted through the gland and a shut-off element is located, a pipe string with a packer installed between the upper and lower layers. A filter is built into the pipe string above the packer and below it is a saddle for a shut-off element made of material with a density less than the density of water injected into the reservoirs, such as wood or polyethylene, the discharge conduit is equipped with a flow meter with a manometer and a shut-off valve (Patent RU No. 59141 U1 for utility model. Equipment for simultaneous and separate injection of water into two layers through one well. - IPC: Е21В 43/16. - 10.12.2006).

A known installation for simultaneous and separate injection of the working agent into two productive formations, comprising well chambers mounted in the production casing of the well on the tubing string, two packers and a plug or fitting nipple with an extractable valve mounted from the lower end of the tubing string . The lower packer is made of hydromechanical action and is located between the lower and upper productive layers. The upper packer is made of mechanical action with a support unit or hydromechanical action and is equipped with a hydraulic anchor and is located above the upper reservoir. Both packers have an opening for the passage of a geophysical cable made in a polyamide sheath. Downhole chambers are installed first under the lower packer, the second between the lower and upper packers and the third with a circulation valve above the upper packer. The first and second downhole chambers are made with replaceable calibrated fittings for pumping the planned volumes of the working agent into the well, and the third downhole chamber is made with a crimping nipple. Pipe and annular pressure and temperature sensors are additionally installed on the pipe string, located above the lower and middle borehole chambers, connected in series with each other and with a ground-based recording unit using a geophysical cable secured to the pipe string by protectors (RU Patent No. 102368 U1 for utility model. Installation for simultaneous-separate injection of the working agent into two productive formations. - IPC: Е21В 43/14. - 03.11.2010). This technical solution is taken as a prototype.

Known equipment for simultaneous-separate injection of water into two layers through one well, including a pipe string with a packer installed between the layers, and a cross coupling that hydraulically couples the internal cavity of the pipe to the over-pack annular well. A check valve is built into the hydraulic channel of the cross-coupling, eliminating the flow of water from the borehole into the pipe cavity. The hydraulic channel of the cross-coupling is equipped with a saddle for its overlap, a shut-off element lowered from the wellhead made of a material with a density less than the density of water injected into the well (Patent RU No. 59140 U1 for utility model. Equipment for simultaneously and separately injecting water into two layers through one well . - IPC: Е21В 43/16. - 12/10/2006). This technical solution is taken as a prototype.

A disadvantage of the known devices is that they do not allow simultaneous separate and sequential injection of the planned volumes of fluid into the formations through one well, since only the total injectivity of all formations of the well is measured by the wellhead flowmeter.

The main task, which is aimed by the claimed group of inventions, is to simplify the design of the device with the ability to quickly measure the injection of the planned volume of fluid into the formation with different injectivity.

The technical result from the use of the proposed group of inventions is the ability to quickly download the planned volumes of fluid into the well strata with different injectivity.

The specified technical result is achieved by the fact that the device for simultaneous-separate fluid injection into two layers of one well mounted on a tubing string containing two packers, the lower packer located between the layers, and the upper packer above the upper wellbore, and interchangeable the nozzle with calibrated bore sections for pumping the planned volumes of fluid into the well, according to the proposed technical solution, the device comprises a suspension equipped with the above-mentioned packers, on two annular protrusions are made on the suspension wall from the cavity side, windows are made between the latter in the wall, communicating the tubing cavity with the upper layer, and in the annular protrusions there is a hermetically sealed glass with an emphasis on the end protrusion made with longitudinal channels, forming annular spaces between them wherein the fittings with calibrated bore sections are installed in the wall of the glass on both sides of the lower annular protrusion of the suspension, communicating the cavity of the glass, on the one hand, with the upper layer hole through the upper fitting, annular space between the annular projections and the window, and the other - the lower reservoir via the lower nozzle, the shell space below the annular projections longitudinal channels and socket protrusion;

the glass on the bottom side is made with a truncated cone;

inside the cup below the upper level and above the level of the lower nozzles, a flow meter can be placed connected by a geophysical cable to a ground-based recording unit, installed through a tubing string using, for example, a downhole lubricator.

The specified technical result is achieved by the fact that, in the device for simultaneous-separate injection of fluid into two layers of one well, mounted on a tubing string containing a packer, uncoupling the reservoir, a locking element saddle communicating the tubing cavity with the lower reservoir, and windows communicating the cavity of the tubing with the upper wellbore, according to the proposed technical solution,

the device contains an additional packer located above the upper wellbore and a suspension equipped with said packers, the windows being made in the wall and the locking element seat in the suspension bottom, and a locking element with a reversible electric drive mounted, for example, secured in the suspension cavity anchors made with through holes and connected by a geophysical cable to the ground-based recording unit, and a window ring gate valve rigidly connected to the locking element with the possibility of being simultaneously opened I close the window or suspension and seat of the closure element, which is located between the meter;

the inner diameter of the suspension is less than the internal diameter of the tubing with the possibility of lowering the annular valve with a locking element and a flow meter on the geophysical cable into the cavity of the suspension through the column of tubing to the stop of the armature in a step transition diameters made on the wall of the suspension.

The analysis of the prior art by the applicant has made it possible to establish that there are no analogues that are characterized by sets of features that are identical to all the features of the claimed variants of the device for simultaneously and separately injecting fluid into two layers of the same well. Therefore, each of the claimed technical solutions meets the condition of patentability "novelty."

The search results for known solutions in the art in order to identify features that match the distinctive features of the prototypes of each of the proposed technical solutions have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the transformations provided for by the essential features of each of the claimed technical solutions on the achievement of the specified technical result has not been revealed. Therefore, each of the claimed technical solutions meets the condition of patentability "inventive step".

The claimed technical solution options can be implemented at any engineering company from well-known materials and accepted technology. Therefore, each version of the proposed technical solution meets the condition of patentability "industrial applicability".

In the present application for the grant of a patent, the requirement of the unity of the invention is met, since the options for a device for simultaneously and separately injecting fluid into two layers of one well solve the same problem - injecting fluid into two layers of one well.

Figure 1 shows a diagram of a device for simultaneous and separate injection of fluid into two layers of the same well (option 1); figure 2 is the same, option 1, with a flow meter; figure 3 is the same (option 2), in the position of simultaneous-separate injection of fluid into the upper and lower layers of the well; figure 4 is the same, option 2, in the position of pumping fluid into the lower layer of the well; figure 5 is the same, option 2, in the position of pumping fluid into the upper layer of the well

A device for simultaneously and separately injecting fluid into two layers of one well according to the first embodiment, mounted on a tubing string 1, comprises a suspension 2 equipped with two packers 3 and 4, the lower packer 4 being located between the layers I and II of the well and the upper packer 3 is above the upper layer I. In the cavity of the suspension 2 there are two annular protrusions 5 and 6, in the latter a glass 7 is sealed with an emphasis on the end protrusion 8 made with longitudinal channels in the suspension 2. (Figure 1). In the wall of the nozzle 7 on either side of the lower annular ledge 6, nozzles 10 and 11 are installed with calibrated flow sections for pumping the planned volumes of fluid into the reservoirs I and II of the well, communicating the cavity of the nozzle 7, on the one hand, with the upper reservoir of the first well I through the upper nozzle 10, the annular space 12 formed between the annular protrusions 5 and 6, and the window 13 made in the wall of the suspension 2, and on the other, with the lower layer II through the lower fitting 11, the annular space 14 formed below the annular protrusions 5 and 6 and longitudinal Channels mechanical protrusion 9 8. 7 glass from the bottom side is formed with a truncated cone. Inside the glass 7 below the upper level and above the lower level of the nozzles 10 and 11, respectively, a flow meter 15 can be placed connected by a geophysical cable 16 to a ground-based recording unit (not shown conventionally), installed through a tubing string 1 using, for example, a downhole lubricator ( conditionally not shown) (Figure 2).

A device for simultaneously and separately injecting fluid into two layers of one well according to the second embodiment, mounted on a tubing string 1, comprises a suspension 2 equipped with two packers 3 and 4, with the lower packer 4 located between the layers I and II, and the upper packer 3 above the upper layer of the first well. Windows 13 are made in the wall of the suspension 2, communicating the tubing cavity 1 with the upper formation I of the well. A saddle 17 is made in the bottom of the suspension 2, which communicates the tubing cavity 1 with the lower layer of the II well. In the cavity of the suspension 2 there is a locking element 18 with a reversible electric drive 19, the latter is fixed in the cavity of the suspension 2 with, for example, an armature 20 in which the passage holes 21 are made, and a window annular valve 22, rigidly connected to the locking element 18 with the possibility of simultaneous opening or closing the windows 13 of the suspension 2 and the saddle 17 of the locking element 18, between which the flow meter 15 is located (Figs. 3, 4 and 5). The reversible electric drive 19 of the locking element 18 and the flow meter 15 are connected by a geophysical cable 16 to a ground-based recording unit (not shown conditionally). The inner diameter d ₁ in the suspension 2 is less than the inner diameter d ₂ in the tubing 1, i.e. d ₁ <d ₂ , which provides the descent of the annular gate valve 22 with the locking element 18 and the flow meter 15 into the suspension cavity 2 through the tubing string 1 on the geophysical cable 16 from the wellhead to the end of the armature 20 into a step transition of diameters d ₁ and d ₂ made on suspension wall 2 under anchor 20.

A device for simultaneous-separate injection of fluid into two layers of one well according to the first embodiment works as follows.

From the bottom to the tubing 1, a suspension 2 is mounted, equipped with two packers 3 and 4, and lowered into the well, while the lower packer 4 is placed between the strata I and II of the well, and the upper packer 3 is above the upper stratum I, respectively. Through the cavity of the tubing string 1 into the suspension 2 with a rope tool, the glass 7 is lowered by a truncated cone through two annular protrusions 5 and 6, in the latter the glass 7 is hermetically installed with an emphasis in the end protrusion 8 (Figure 1). If necessary, through the tubing string 1 through a geophysical cable 16 connected to the ground-based recording unit, and using a downhole lubricator inside the cup 7 below the level of the upper and higher levels of the lower fittings 10 and 11 with calibrated flow sections, respectively, have a flow meter 15 (figure 2 ) The fluid supply through the tubing 1 is injected into the upper and lower layers of I and II wells. In this case, the liquid from the tubing 1 flows under pressure into the cavity of the nozzle 7, then through the calibrated passage section of the nozzle 10, the annular space 12 and the window 13 into the upper formation I, and through the calibrated passage section of the nozzle 11, the annulus 14 longitudinal channels 9 in the end protrusion 8 suspension 2 in the lower layer II. Calibrated flow sections of the nozzles 10 and 11 provide the planned volume of fluid pumped into the reservoirs I and II of the well. The flow meter 15 controls the injection of fluid volume into reservoir II, which is recorded by the ground-based registration unit, while the volume of fluid injection into reservoir I is determined as the difference between the volumes of injection through the wellhead Q _1,2 and Q ₂ , i.e. Q ₁ = Q _1,2 -Q ₂ . If, after determining the injectivity, it becomes necessary to adjust the volume of fluid injected into formations I and II, then the glass 7 is removed with a rope tool and the nozzles 10 and 11 are replaced with the corresponding calibrated flow sections.

A device for simultaneously and separately injecting fluid into two layers of one well according to the second embodiment works as follows.

From the bottom to the tubing 1, a suspension 2 is mounted, equipped with two packers 3 and 4, and lowered into the well, while the lower packer 4 is placed between the strata I and II of the well, and the upper packer 3 is above the upper stratum I, respectively. Through the cavity of the tubing string 1, with a diameter of d ₂ > d ₁ , into the suspension 2 on the geophysical cable 16 connected to the ground-based recording unit, the locking element 18 with a reversible electric drive 19 is freely lowered, moreover, in the open saddle position 17 and the windows 13 are fixed in the anchor 20, and the window annular valve 22 with a flow meter 15, which are installed with the emphasis of the armature 20 in a step transition of diameters d ₁ and d ₂ on the wall of the suspension 2. As a result, the locking element 18 locks the seat 17 (Figure 3). The fluid supply through the tubing 1 produce simultaneous-separate injection into the upper and lower layers of I and II wells. In this case, the liquid from the tubing 1 enters under pressure through the through-holes 21 of the armature 20 through the windows 13 into the upper formation I and the seat 17, washing the flow meter 15 into the lower 8 formation II of the well. In this case, the flow meter 15 controls the injection of fluid volume into reservoir II, which is recorded by the ground-based registration unit, and the fluid injection volume into reservoir I is determined as the difference between the injection volumes through the wellhead Q _1,2 and Q ₂ , i.e. Q ₁ = Q _1,2 -Q ₂ . If, after determining the injectivity, there is a need to adjust the volume of fluid injection in layers I and II, then either the windows 13 are closed with a window ring valve 22 (Figure 4), or the seat 17 with a locking element 18 (Figure 5) using a reversible electric drive 19 on command from the surface of the well.

The proposed device options for simultaneous-separate injection of fluid into two layers of one well will allow for the simultaneous simultaneous-separate or sequential injection of fluid into the formation of the well with different injectivity.

Claims (5)

1. A device for simultaneous-separate injection of fluid into two layers of one well mounted on a tubing string containing two packers, the lower packer located between the layers and the upper packer above the upper layer of the well, and interchangeable fittings with calibrated flow sections for pumping the planned volumes of fluid into the well, characterized in that the device comprises a suspension equipped with the aforementioned packers, two annular projections are made on the wall of the suspension from the cavity side, between the windows in the wall are made the last, communicating the cavity of the tubing with the upper layer, and in the annular protrusions there is a hermetically sealed glass with an emphasis on the end protrusion made with longitudinal channels, which form annular spaces between each other, while the fittings with calibrated passage sections are installed in the wall cups on both sides of the lower annular protrusion of the suspension, communicating the cavity of the cup, on the one hand, with the upper layer of the well through the upper fitting, the annulus between the annular stupas and windows, and on the other, with the lower layer through the lower fitting, the annular space below the annular protrusions and the longitudinal channels of the end protrusion. 2. The device according to claim 1, characterized in that the glass from the bottom is made with a truncated cone. 3. The device according to claim 1, characterized in that a flow meter connected by a geophysical cable to a ground-based recording unit, installed through a tubing string using, for example, a downhole lubricator, can be placed inside the glass below the level of the upper and higher levels of the lower fittings. 4. A device for simultaneous-separate injection of fluid into two layers of one well mounted on a tubing string, containing a packer separating the beds, a locking element saddle communicating the tubing cavity with the lower reservoir, and windows communicating the tubing cavity compressor pipes with an upper wellbore, characterized in that the device comprises an additional packer located above the upper wellbore and a suspension equipped with said packers, the windows being made in the wall, and for the locking element - in the bottom of the suspension, in the cavity of the suspension there is a locking element with a reversible electric drive, fastened with, for example, an anchor made with passage holes and connected by a geophysical cable to the ground-based recording unit, and a window ring valve rigidly connected to the locking element with the possibility of simultaneously opening or closing the suspension window and the saddle of the locking element, between which the flow meter is located. 5. The device according to claim 4, characterized in that the inner diameter of the suspension is less than the inner diameter of the tubing with the possibility of lowering the annular valve with a locking element and a flow meter on the geophysical cable into the cavity of the suspension through the column of tubing to the stop of the armature in the transition diameters made on the wall of the suspension.

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