US20230332485A1 - Device and method of productive formation selective processing - Google Patents

Device and method of productive formation selective processing Download PDF

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US20230332485A1
US20230332485A1 US17/639,080 US202117639080A US2023332485A1 US 20230332485 A1 US20230332485 A1 US 20230332485A1 US 202117639080 A US202117639080 A US 202117639080A US 2023332485 A1 US2023332485 A1 US 2023332485A1
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packer
tubing
hydraulic fracturing
well casing
feedthrough
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Salavat Anatolyevich Kuzyaev
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures

Definitions

  • the invention relates to mining and is used to repair and operate oil wells. It is designed for productive formation selective processing within one tripping with real-time annular space flushing during well work.
  • One of the ways to prevent an accident in the well due to the downhole equipment sticking is to ensure high-quality flushing of the cavities between the equipment and the production string, especially in the area of the productive formation, as well as the internal cavities of the equipment used for process fluids.
  • a method of oil-well jet pump operation involves productive formation area clean-up performed after hydraulic fracturing using oil-well jet pump (patent of the Russian Federation No. 2273772, published 10.04.2006, bulletin 10).
  • downhole equipment being part of a jet pump with a stepped through channel in its casing, as well as a packer with a through channel and a shank with an inlet funnel positioned below the jet pump are descended into the well on the tubing string (hereinafter referred to as tubing). Then the packer positioned above the productive formation is unpacked.
  • a blocking insert with a central through channel is installed in the stepped through channel of the jet pump, and frac fluid or a mixture of frac fluid with chemical reagents is injected into the productive formation.
  • the blocking insert is removed and lifted to the surface, and a flexible tube is lowered through the tubing into the well through the seal assembly, so that the tube could be moved.
  • the seal assembly is installed while lowering the flexible tube in the stepped through channel of the jet pump.
  • the lower end of the flexible tube is installed below or at the level of the lower perforation interval of the productive formation.
  • a working liquid medium is fed into the nozzle of the jet pump through the annular space of the well.
  • the productive formation is drained by creating a depression on the productive formation.
  • liquid for washing the well bottom is fed through the flexible tube.
  • the ratio between the fluid pressure in the flexible tube and the fluid pressure in the annular space of the well is maintained at (Pr:Pp) ⁇ 0.98.
  • the fluid stops to be fed into the flexible tube for flushing the bottom of the well.
  • the well jet device used to implement the described method comprises a packer and a through channel on a tubing string, as well as a jet pump, in the body of which an active nozzle and a mixing chamber with a diffuser are arranged.
  • the jet pump is equipped with a stepped through channel. Below the jet pump, there is a shank with an inlet funnel.
  • a seal assembly or, alternatively, a blocking insert is installed in the stepped through channel.
  • a flexible tube is put through the seal assembly. The lower end of the flexible tube is installed below or at the level of the lower perforation interval of the productive formation.
  • the well jet device is placed in the well in such a way that the jet pump and packer are located above the productive formation.
  • the disadvantage of this method and the well jet device itself is the high probability of emergency extraction from the well in the event of jamming due to the sprinkling of mechanical debris in the annular space between the tool and casing. Cleaning and extracting solids, in particular, flushing the annular space from the proppant, is not performed according to the method described in the patent. Due to the packer being sprinkled on top, which cannot be avoided, the design of the jet device does not allow fluid to flow in a reverse direction to wash debris out from the well, for example, through the annulus space.
  • Another disadvantage of this system is that it is impossible to use when processing several intervals of the productive formation within one tripping, since after washing the bottom of the well, the device is immediately lifted to the surface.
  • the trap consists of two separate assemblies - the upper and lower ones positioned in the workstring at some distance from each other.
  • the upper assembly comprises a screen resembling a sieve, a bull plug and a 3-way adapter.
  • the lower assembly comprises a screen, a 3-way adapter and a ball check valve.
  • the upper and lower assemblies are fixed in the workstring using known means of connection.
  • the trap works together with the sand control tool in the well.
  • the process fluid with the proppant enters the tubing for hydraulic fracturing, while the proppant begins to accumulate in the annular space between the tool and casing.
  • the fluid passes through the screen built into the tubing and enters the washpipe. Then the fluid passes through the lower assembly of the trap and the ball valve, and enters the washpipe area between the assemblies and then the upper assembly of the trap. Moving forward, the fluid is additionally filtered in the trap assemblies. This prevents the further spread of the proppant.
  • the proppant is separated from the fluid by the filter of the lower assembly and is blocked by the ball check valve.
  • the reversing tool is designed to carry fluid and debris out of the well, especially when there are large annular cross-sectional areas.
  • the tool permits reverse circulation of the riser at reduced pump rates without compromising debris carrying capacity.
  • the reversing tool consists of a cylindrical component with cup sealing elements that hermetically separate the casing and create two separate annular gaps: one above and one under the sealing elements.
  • the cylindrical element is equipped with an internal partition forming two channels in the internal cavity of the tubing. One channel is descending, the other is ascending. Through the descending channel, the flow of fluid or other material is removed from the tubing into the annular space under the sealing element.
  • the annular space above the sealing element can be used for collecting debris that cannot be carried by the flow at a reduced speed, while debris collectors should not prevent the flow from flowing at a technological speed.
  • the reversing tool is part of the fluid circulation system.
  • the fluid flows from the tank through the suction line to the pump, which belongs to the surface system.
  • the pump moves the flush fluid through the pipeline to the upper tubing string above the cup sealing element.
  • the flush fluid flows down the upper part of the tubing to the reversing tool, where it is diverted to the annular space under the cup sealing element.
  • the mixture of the flush fluid and debris continues to flow down the annular space to the bottom of the well and returns to the tubing again.
  • the filtered mixture reaches the reversing tool and again diverts and enters the annular space above the cup seal.
  • flowing up the upper part of the tubing the flush fluid enters the tank.
  • the reversing tool can continuously operate for more than two years, performing more than 4000 cycles during its lifetime.
  • an alert system comprising pressure gauges, which monitor the pressure differential and indicate a risk of blockage to alert a well operator that the traps have filled or contain significant amount of debris.
  • the disadvantage of this system is the limited scope of use, mainly in offshore wells, and does not involve simultaneous technological operations for processing productive formations.
  • the operation of the system is based on multiple filtration stages, and contains complex equipment for washing these devices that should be replaced periodically.
  • composition and arrangement of the main components of the system are similar for all the versions presented in the patent and include an anchor installed on the tubing (from bottom to top), lower packer, hydraulic fracturing unit, upper packer, mechanically operated valve, sand control assembly and pressure activated injection assembly. Below the anchor there is a valve that is closed during hydraulic fracturing and a hole for removing excess fluid.
  • the anchor fixes the device to the wellbore and can be installed by axial movement up and down.
  • the upper and lower packers are designed to isolate the area of the productive formation.
  • the mechanically operated valve is part of the sand control assembly and participates in creating a pressure difference in the annulus below the sand control assembly to ensure the annular gap flushing.
  • the sand control assembly is positioned above the hydraulic fracturing unit and is designed to remove the extracted sand and gravel from the annulus when moving to another processing zone or to the surface.
  • a flushing device is used together with the sand control assembly during the annular gap flushing. It provides hydraulic communication with the annular space in the annular gap zone through radial ports.
  • the sand control assembly is additionally equipped with a check valve and one or more additional packers.
  • the patent presents three versions of the flushing device, one of which can be activated several times, which ensures flushing of the annular gap when processing several productive formations within one tripping.
  • the flushing device is located above the hydraulic fracturing unit, is connected to the valve and opens when the flushing fluid is fed at an appropriate pressure, which is significantly higher than the hydraulic fracturing pressure. That is why the device is closed during hydraulic fracturing.
  • the flushing device comprises a sliding sleeve installed in the housing, a piston and a return spring.
  • a spring force from a return spring opposes the net pressure force exerted on the net piston area.
  • Radial ports are made in the housing, blocked by the piston when the flushing device is closed. Radial ports have nozzles to ensure the jet flows at a given angle into the wellbore to flush the annular space in different directions.
  • the system is also equipped with a release mechanism that activates and deactivates the packers sealing the productive formation area and the hydraulic fracturing unit.
  • the release mechanism is made in the form of a housing, which is part of the system, with an axially movable inner sleeve inside.
  • the inner sleeve is provided with a radial port.
  • the inner sleeve When the system is idling, the inner sleeve is in the working position, while the packers sealing the productive formation area and the hydraulic fracturing unit are not active.
  • the radial port of the inner sleeve is closed by a removable sleeve.
  • the position of the inner sleeve ensures the passage of fluid through the piston inside and closes the hydraulic connection with the annulus through the radial ports in the housing.
  • the removable sleeve is fixed within the housing by a retainer.
  • the system is designed to be used in emergencies when it is impossible to remove the drilling tool from the well, as the upper packer is sprinkled with debris and it is impossible to flush the annular gap in the annular inter-packer space. This makes it impossible to control the flushing circulation unit and extract the tool from the well. Additional units are required to flush the space above the second-from-the-bottom packer.
  • Another disadvantage of the system is its complicated structure caused by additional elements for various purposes (packers, valves), the use of spring mechanisms for controlling the flushing device, which are prone to instability, changes in elastic properties and subsequent deformation.
  • One more disadvantage of the device is the use of high pressures that exceed the hydraulic fracturing pressure by 2-5 times when flushing.
  • the flushing pressure will be 1400-3500 atmospheres, which is significantly higher than 1000 atmospheres - the pressure for which standard hydraulic fracturing equipment is designed.
  • pressures which are several times higher than the one of hydraulic fracturing during annular space flushing requires non-standard wellhead equipment, a non-standard tubing hanger, non-standard pumping equipment for hydraulic fracturing, which significantly reduces the manufacturability of the system and limits its scope of use.
  • the objective of the invention is to increase the efficiency of a productive formation processing within one tripping, reduce the accident rate and increase the lifetime of the proposed device (herein further referred to as the ‘inventive device’).
  • a borehole usable in the mining industry is associated with the productive formation, and a well casing is mounted within the borehole.
  • a tubing also known as ‘tubing string’
  • An annulus space is herein defined as a space between an outer surface of the inventive device / tubing and, on the other hand, an inner surface of the well casing.
  • the inventive device essentially coupled with the tubing, comprises: a mechanical anchor, a collar locator, a lower feedthrough packer, a hydraulic fracturing port, an upper feedthrough packer and a centralizer sequentially installed from bottom to top on the tubing.
  • An inter-packer annular gap is herein defined as a portion of the annulus space located between the outer surface of said inventive device and the inner sidewall surface of said well casing, vertically limited by positions of the upper feedthrough packer and the lower feedthrough packer.
  • the technical result is to ensure simultaneous flushing of the inter-packer annular gap between the well casing and the inventive device, as well as internal cavities of the inventive device after each processed interval of the productive formation and to increase the reliability and manufacturability of the inventive device by simplifying its design.
  • the method of selective processing of the productive formation includes sequential hydraulic fracturing and flushing of the inter-packer annular gap of each interval of the productive formation, using the inventive device which is lowered into the well casing to the level of the lowest interval of the productive formation.
  • the inventive device When the inventive device reaches the level at which the interval of the productive formation to be processed is located in the inter-packer annular gap, the inventive device is fixed to the well casing with the mechanical anchor. Next, the working fluid is fed under pressure to the tubing, then to the hydraulic fracturing port, and the interval of the productive formation is isolated with the packers which include cup sealing elements. Then hydraulic fracturing is carried out.
  • the inter-packer annular gap is flushed.
  • flush fluid is fed to the annular space, then the lower feedthrough packer is activated and debris is washed out of the upper area of the inter-packer annular gap through windows of the hydraulic fracturing port and up the tubing.
  • the inventive device is turned to the transport position. Then the tubing is axially moved to shift a hollow rod of the inventive device and flushing holes of the hydraulic fracturing port are opened. After that, the flush fluid is fed under pressure into the tubing, the cup sealing elements of the upper and lower feedthrough packers are activated and the debris is washed out of the lower area of the inter-packer annular gap and the cup seals, pushing the mixture along an inner cavity of the inventive device into the well casing.
  • the flush fluid is supplied by a pumping unit positioned on the surface.
  • the mechanical anchor is deactivated by longitudinal movement of the inventive device.
  • Debris from the upper area of the inter-packer annular gap is disposed of on the surface in any known way.
  • the inventive device comprises a mechanical anchor, a lower feedthrough packer, a hydraulic fracturing port, and an upper feedthrough packer sequentially installed on the tubing.
  • the feedthrough packers with cup sealing elements are directed towards the hydraulic fracturing port.
  • a hollow rod is located in the inner cavity of the inventive device.
  • a casing of the hydraulic fracturing port is divided by a partition into an upper part with the aforementioned windows and a lower part with the aforementioned flushing holes, providing hydraulic connection of the annular inter-packer gap with the inner cavity in the lower part of the partition.
  • the lower feedthrough packer has a longitudinal cavity on the inner surface thereof, and the hollow rod features protrusions that interact with the longitudinal cavity while moving alongside. The distance between the lower feedthrough packer and the flushing holes does not exceed two diameters of the well casing.
  • the sealing capacity of the flushing holes is ensured by seals placed above and below the flushing holes.
  • the inner cavities of the hollow rod, the lower feedthrough packer and the mechanical collar locator form a single flushing channel.
  • the hollow rod is rigidly bound to the mechanical anchor.
  • the device can be additionally equipped with a collar locator positioned under the lower feedthrough packer as well as with a centralizer.
  • Transporting debris from the inter-packer annular gap and disposing of it at the surface during the first cycle, as well as removing debris out of the inventive device into a waste area of the well casing during the second cycle completely eliminates any solids.
  • the sequence of hydraulic fracturing, the first and second cycles of the inter-packer annular gap flushing ensures a smooth movement of the device along the casing.
  • the simple and reliable design of the device ensures the flow of the flush fluid through two unconnected debris removal channels, which are managed by a simple longitudinal movement (activation/deactivation) of the mechanical anchor and due to the interaction of two elements - the hollow rod and the body of the lower feedthrough packer.
  • FIG. 1 general view of the device
  • FIG. 2 - enlarged view of the hydraulic fracturing port
  • FIG. 3 longitudinal section of the device in the transport position
  • FIG. 4 longitudinal section of the device with an activated mechanical anchor
  • FIG. 5 - enlarged view of the hydraulic fracturing port in the position of the device shown in FIG. 3 ;
  • FIG. 6 longitudinal section of the device during hydraulic fracturing
  • FIG. 7 working fluid flow diagram with an activated anchor
  • FIG. 8 working fluid flow diagram with a deactivated mechanical anchor.
  • the present invention is designed for selective processing of a productive formation in the oil mining industry.
  • a borehole associated with the productive formation is provided and a well casing 23 is mounted within the borehole.
  • a tubing 22 is typically inserted into the well casing 23 .
  • the inventive device essentially coupled with the tubing 22 comprises: a mechanical anchor 1 , a collar locator 2 , a lower feedthrough packer 3 , a hydraulic fracturing port 4 , an upper feedthrough packer 5 and a centralizer 6 sequentially installed from bottom to top on the tubing 22 ( FIG. 1 , FIG. 2 ).
  • the mechanical anchor 1 and the collar locator 2 each defines an inner cavity located therein.
  • An annulus space is herein defined as a space between an outer surface of the inventive device / tubing 22 and, on the other hand, an inner surface of the well casing 23 .
  • Pipes 7 are connected to the centralizer 6 , the installation of which is determined by the need and conditions for processing intervals of the productive formation of variable length.
  • the lower feedthrough packer 3 includes cup sealing elements 8 directed towards the hydraulic fracturing port 4 .
  • the upper feedthrough packer 5 includes cup sealing elements 9 also directed towards the hydraulic fracturing port 4 .
  • a casing of the hydraulic fracturing port 4 includes windows 10 ( FIG. 2 ).
  • the hydraulic fracturing port 4 contains a partition 11 located inside the casing of the hydraulic fracturing port with a recess 12 in its lower part, and a divider 13 in the upper part ( FIG. 3 ).
  • radial flushing holes 14 are made in the lower part of the hydraulic fracturing port 4 , connecting the recess 12 with the annulus space.
  • the lower feedthrough packer 3 defines an inner cavity 19 within thereof ( FIG. 7 ).
  • a hollow rod 15 is at least partially located in the inner cavity 19 of the lower feedthrough packer 3 , with the possibility of axial movement, rigidly connected to the mechanical anchor 1 with a cone 16 .
  • the hollow rod 15 defines its own inner cavity within thereof.
  • Sealing capacity of the radial flushing holes 14 is ensured by seals 18 installed on an inner surface of the partition 11 above the holes 14 and on an inner surface of the lower feedthrough packer 3 below the holes 14 .
  • the hollow rod 15 On a side of an outer surface of the hollow rod 15 , it is equipped with limiting protrusions 17 that perform axial movement along the cavity 19 on the inner surface of the lower packer 3 , the longitudinal size of which determines a size S of a stroke of the hollow rod 15 ( FIG. 3 and FIG. 4 ).
  • the inner cavity of the rod 15 , the inner cavity of the lower feedthrough packer 3 , the inner cavity of the collar locator 2 and the inner cavity of the mechanical anchor respectively communicate with each other and form a single flushing channel 20 ( FIG. 3 ).
  • the hollow rod 15 When the device is set in a transport position, the hollow rod 15 is in a lower position, where the protrusions 17 rest against a lower horizontal wall of the cavity 18 .
  • the radial flushing holes 14 provide communication of the recess 12 with the annular inter-packer space ( FIG. 2 and FIG. 3 ).
  • the cup seals 8 of the lower feedthrough packer 3 are located at a distance H1 ( FIG. 3 ) from the flushing holes 14 of the hydraulic fracturing port 4 ; the distance H1 depends on a diameter of the well casing 23 and does not exceed two diameters of the well casing 23 .
  • the device for implementing the described method works as follows:
  • the device Before lowering into the well casing 23 , the device is assembled at the wellhead and installed on the tubing 22 .
  • the hollow rod 15 When descending, the mechanical anchor 1 , the lower 3 and upper 5 feedthrough packers are in the transport position, the hollow rod 15 is in the lower position and is fixed by the limiting protrusions 17 to prevent its axial downward movement.
  • the device Before processing the productive formation, the device is placed in a blank section of the well casing 23 and the feedthrough packers are pressed.
  • the device is installed in such a way that the interval to be processed is located in the inter-packer space and the mechanical anchor 1 is activated, ensuring that the device is fixed to the well with anchor elements 21 ( FIG. 4 ). Then part of the tubing 22 weight is unloaded onto the mechanical anchor 1 , while the hollow rod 15 enters the recess 12 , hermetically closing the flushing holes 14 with the help of seals 18 ( FIG. 5 ).
  • hydraulic fracturing fluid is supplied to the tubing 22 under pressure and, due to the counterflow from the hydraulic fracturing port 4 , the cup sealing elements 8 and 9 of the feedthrough packers 3 and 5 open and hermetically align to the inner wall of the well casing 23 , reliably isolating the inter-packer space. Then, hydraulic fracturing is performed ( FIG. 6 ).
  • the tubing 22 , the inventive device and the annulus space between the device and the well casing 23 are flushed to remove proppant and other debris, ensuring a smooth and safe movement of the device to the next interval of the productive formation or during its removal from the well casing 23 .
  • Flushing of the annular space of the well casing 23 and the cavities of the device is carried out in two cycles as follows.
  • the pumping unit located on the surface feeds the flush fluid under pressure into the annular space, while the cup sealing elements 8 of the lower feedthrough packer 3 are in the active position.
  • the flush fluid enters the inner cavity of the hydraulic fracturing port 4 through the windows 10 and then flows through the upper feedthrough packer 5 and up the tubing 22 to the surface, carrying the proppant and other solids from the upper area of the inter-packer space ( FIG. 7 ).
  • the supply of the flush fluid is stopped.
  • the device is turned to the transport position.
  • the mechanical anchor 1 is deactivated by longitudinal movement of the device.
  • the hollow rod 15 moves down until the limiting protrusions 17 rest against the wall of the cavity 19 and opens the flushing holes 14 .
  • the flush fluid is again fed under pressure into the tubing 22 ( FIG. 8 ).
  • the flush fluid enters the internal cavities of the upper feedthrough packer 5 and the hydraulic fracturing port 4 . Then, it exits through the windows 10 into the inter-packer space, activating the upper 5 and lower feedthrough packers 3 , thoroughly washing the proppant and other solids out of the lower area of the inter-packer space.
  • the mixture enters the flushing holes 14 and the inner cavity of the rod 15 . It then flows through a single flushing channel 20 outside the device into the well casing 23 .
  • the method is implemented as follows.
  • the inventive device assembled at the wellhead is lowered into the well casing 23 , which is oppressed by a pressure of 15 MPa.
  • the total length of the wellbore is 3250 m, including the sidetrack of 450 m.
  • the device is lowered at a velocity of no more than 0.25 m/s when moving along the well casing 23 with a diameter of 168 mm, a length of 2800 m, and at a velocity of 0.1 m/s when moving along a sidetrack with a diameter of 114 mm (strength group N80 API 5CT).
  • the device is placed in a blank area of the sidetrack and the feedthrough cup packers 5 and 3 are put under 12 MPa pressure.
  • the sequence of productive formation interval processing is set in such a way that the lowest interval at the level of 3200 - 3215 m is processed first.
  • the inventive device is installed in the well casing 23 in such a way that the interval to be processed is located between the cup packers 5 and 3 .
  • the inventive device is then fixed to the well casing 23 with anchor elements 21 when the mechanical anchor 1 is activated ( FIG. 4 ).
  • hydraulic fracturing fluid is pumped through the tubing 22 and packers 5 and 3 with cup seals 8 and 9 are activated, ensuring a tight fit to the inner wall of the well casing 23 and reliably isolating the annular gap between the well casing 23 and the inventive device in the inter-packer space.
  • hydraulic fracturing is carried out at 46 MPa. ( FIG. 6 ).
  • the inter-packer annular gap is flushed to remove debris (mechanical particles, proppant) after hydraulic fracturing.
  • the first cycle begins with supplying the flush fluid at 100 atmospheres by a pumping unit located on a ground surface surrounding a top entrance (top mouth) of the well casing 23 . Ensuring the flow rate of the flush fluid of 6 1/s, the cup seals 8 of the lower feedthrough packer 3 are activated. The debris is washed out of the upper area of the inter-packer annular gap through the windows 10 of the hydraulic fracturing port 4 , being pushed along the tubing to the surface for disposal ( FIG. 7 ).
  • the mechanical anchor 1 is deactivated by longitudinal movement of the device, and the device is turned to the transport position.
  • the tubing 22 is axially moved to shift the hollow rod 15 of the device until the limiting protrusions 17 rest against the wall of the cavity 19 opening the flushing holes 14 .
  • the flush fluid is supplied at a pressure of 12 MPa and at a flow rate of 1.5 1/s, activating the lower 3 and upper 5 packers.
  • the flush fluid cleans the lower area of the inter-packer annulus. It washes out small debris from the cup seals 8 of the lower packer 3 and all the internal cavities of the device below the hydraulic fracturing port, while all the debris is pushed down outside the device into the well casing 23 .
  • the cleanup period of the second cycle is determined by the presence or absence of resistance to the movement of the device in the well casing 23 .
  • the device After it is flushed, the device is lifted to process the second interval of the productive formation at the level of 3035 - 3050 m observing the sequence of actions for hydraulic fracturing and flushing of the annular inter-packer space and the elements of the device.
  • the inventive device is removed from the well casing 23 .
  • the claimed invention makes it possible to provide high-quality, technological cleanup of the inter-packer annulus space, trouble-free movement of the downhole tool for processing several intervals of the productive formation within one tripping, using a simple and reliable device.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
US17/639,080 2020-08-21 2021-08-23 Device and method of productive formation selective processing Pending US20230332485A1 (en)

Applications Claiming Priority (3)

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