EP3312380A1 - Procédé et système d'injection d'un fluide de traitement dans un puits - Google Patents

Procédé et système d'injection d'un fluide de traitement dans un puits Download PDF

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Publication number
EP3312380A1
EP3312380A1 EP16195215.5A EP16195215A EP3312380A1 EP 3312380 A1 EP3312380 A1 EP 3312380A1 EP 16195215 A EP16195215 A EP 16195215A EP 3312380 A1 EP3312380 A1 EP 3312380A1
Authority
EP
European Patent Office
Prior art keywords
well
double
tubular string
treating fluid
walled tubular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16195215.5A
Other languages
German (de)
English (en)
Inventor
Edwin Hilbert GORT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP16195215.5A priority Critical patent/EP3312380A1/fr
Publication of EP3312380A1 publication Critical patent/EP3312380A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
    • 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
    • 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
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/05—Flapper valves

Definitions

  • the invention relates to a method and system for injecting a treating fluid into a well, in particular a well producing hydrocarbon fluid.
  • the treating fluid may serve to dissolve solid and/or liquid deposits and/or generate a foam that is easily lifted to surface.
  • a Velocity String can be installed in a gas well in order to narrow the cross-sectional area of the production tubing and therefore increase the wet gas velocity such that any solids and/or condensed water and/or other condensates are lifted to the earth surface and do not accumulate at the bottom of the wells.
  • a Capillary String is a small diameter flexible injection tube through which a foam generating agent, which typically contains a surfactant, is injected to the bottom of the well, so that it will generate a foam upon contact with water and/or other condensates, which foam has low density than the liquids so that liquids can be easier lifted to surface.
  • a foam generating agent typically contains a surfactant
  • a foam generating agent is injected into a lower part of a wet gas production well via a small diameter foam generating agent injection tube that is suspended in the production tubing below a flapper type Surface Controlled Sub-Surface Safety Valve (SCSSSV) that is actuated via a hydraulic line through which the foam generating agent is injected at an elevated pressure to keep the SCSSSV open.
  • SCSSSV Surface Controlled Sub-Surface Safety Valve
  • a disadvantage of the known method and system is that the small diameter foam generating agent injection conduit is a fragile piece of equipment that may vibrate and be damaged by produced sand or rock particles in the produced wet gas stream and that the damaged conduit may break and obstruct the SCSSSV.
  • a method for injecting a treating fluid into a hydrocarbon fluid production well via an injection conduit which is at least partially formed by an annular space between inner and outer walls of a double-walled tubular string suspended within the well.
  • the invention moreover provides a system for injecting a treating fluid into a hydrocarbon fluid production well, the system comprising a flapper valve and an injection conduit in fluid connection which is at least partially formed by an annular space between inner and outer walls of a double-walled tubular string suspended within the well.
  • the double-walled tubular string is connected to a downhole side of a flapper valve that is mounted within a production tubing inside the well.
  • the double-walled tubular string can be suspended from the flapper valve.
  • a hydraulic control line for the flapper valve and a transfer conduit for treating fluid from the hydraulic control line to the annular space are provided, and the treating fluid is passed via the hydraulic control line and the transfer conduit to the annular space for injection into the hydrocarbon fluid production well.
  • the transfer conduit comprises a back pressure valve.
  • the back pressure valve can serve to hold open the flapper valve and/or inject the treating fluid into the annular space.
  • the inner wall of the double walled tubular string comprises at least one sleeve valve.
  • the treating fluid can be injected from the annular space into the interior of the double-walled tubular string through such sleeve valve.
  • injection sleeve valve can be provided at a lower part or lower end of the double-walled tubular conduit.
  • a sleeve valve can be provided as part of the transfer conduit for treating fluid from the hydraulic control line to the annular space.
  • Suitable sleeve valves can for example be a Side Sliding Door (SSD) valve.
  • SSD Side Sliding Door
  • the well is a wet natural gas production well and the treating fluid comprises a foam generating agent.
  • the foam generating agent can be injected into a lower section of the well to generate a low density foam upon contact with condensed water and/or other condensates that is lifted by the wet gas production stream to production facilities at the earth surface.
  • the double-walled tubular string is a double-walled velocity string.
  • the double walled tubular string is connected to a downhole side of the flapper valve, e.g. suspended from the downhole side of the flapper valve.
  • the system further comprises a hydraulic control line for the flapper valve, and a transfer conduit for treating fluid from the hydraulic control line to the annular space.
  • the transfer conduit can further comprise a back pressure valve.
  • the flapper valve is a sub-surface safety valve surface, such as a surface retrievable sub-surface safety valve, and can in particular be a so-called Tubing Retrievable (TRSSSV).
  • TRSSSV Tubing Retrievable
  • the method and system according to one aspect of the invention facilitate easy and safe integration of the functions of a conventional Capillary String and a conventional Velocity String. It does not require a Bottom Hole Assembly of Capillary, therefore increases the reliability of the installation and mitigates a need to run capillary coil into the well. After installing the velocity string it is possible to install the capillary installation with slickline equipment.
  • Figure 1 is a schematic longitudinal sectional view of a well into which a treating fluid is injected via a double-walled tubular string in accordance with the present invention.
  • Figure 1 shows a system 1 for injecting a treating fluid into a hydrocarbon fluid production well in accordance with the invention.
  • the system 1 is arranged in a surrounding wellbore in an earth formation (not shown) as part of a hydrocarbon fluid production well.
  • the system 1 in the embodiment as shown comprises a production tubing 2 in which a Tubing Retrievable Sub-Surface Safety Valve (TRSSSV) or other flapper valve 3 is suspended.
  • TRSSSV Tubing Retrievable Sub-Surface Safety Valve
  • the flapper valve 3 is suspended by means of two pairs of seals 4 and 5, such that an annular region 6 is formed between the seals 4, 5, the outer surface of the valve 3 and the inner surface of the production tubing 2.
  • a hydraulic control 7 line for the flapper valve is connected to a fluid port 8 through which a treating fluid 9, such as a foam generating agent, can be passed into the annular region 6.
  • An injection conduit in the form of a double-walled tubular string, in this embodiment a velocity string 10, is suspended from the flapper valve 3 and comprises an outer wall 11 and an inner wall 12 between which an annular space 13 is formed.
  • a transfer conduit 14 is provided which comprises a receiving conduit part 15 in direct fluid communication with the control line 7, a back pressure valve 16 (in this embodiment concentric with the tubular string 10), and a distribution conduit part 17 providing fluid communication from the back pressure valve 16 to the annular space 13, in this embodiment via a sleeve valve.
  • the sleeve valve 18 is a Side Sliding Door (SSD) valve in an upper part of the inner wall 12 of the double-walled velocity string 10.
  • SSD Side Sliding Door
  • the distribution conduit 17 is arranged within the double-walled velocity string 10 by means of a cross-over assembly in an upper part of the double-walled velocity string 10.
  • This cross-over assembly as shown contains seals 19,20 extending below and above; and therebetween the distribution part 17 of the transfer conduit 14 is arranged.
  • the seals 19,20 are suitably inline with the Inner Diameter(ID) of the velocity string 10 to reduce any risk resulting from erosion.
  • a further sleeve valve, SSD valve 21, is arranged near a lower end of the inner wall 12.
  • the lower sleeve valve which can also be referred to as a lower cross-over, allows selective opening or closing the bottom part of the double-walled tubular string, such as to enable injection near perforations.
  • the double walled tubular string can extend for a short or long distance into the well underneath the flapper valve, in some embodiments it can be 10 m or more, 100 m or more, 500 m or more, such as 1 km or more long.
  • the hydrocarbon fluid production well is a wet gas production well. It can be desired during production operation to generate foam at the downhole end of the velocity string 10, e.g. when the flow velocity increase caused by the velocity string is not anymore sufficient to remove the liquid components from the bottom of the wet gas well.
  • a foam generating agent e.g. a surfactant or a foaming agent of a type as generally known in the art, can be passed down the control line for the flapper valve and into the annular space 13.
  • the sleeve valves 18 and 21 are operated using e.g.
  • the foaming agent flows to the back pressure valve 16, which is operated so as to keep the flapper valve open while passing the foam generating agent via distribution conduit 15 and sleeve valve 18 into the annulus 13 of the double-walled velocity string 10, from where it is injected via sleeve valve 21 into the lower part of the velocity string 10 in the hydrocarbon fluid producing well.
  • the foam generating agent gets into contact with condensed water and/or other condensates in the wet gas stream 21, a lower density foam is created, such that the foam is easily lifted by the wet gas stream 21 to production facilities at the earth surface (not shown).
  • the method and system according to the invention provide the possibility to install a Velocity string and afterwards operate for inject foam generating agent (similar to a capillary string), but without the need of installing a separate Capillary installation.
  • a conventional capillary string installation has several disadvantages. One of them is that the small inner diameter it can relatively easily block which will result in failure of the capillary installation. This solution is heavily reduced in components, minimizing the risk of failures. This will maximize Ultimate Recovery of a wet gas production well.
  • the method and system according to the invention increase the reliability because a conventional capillary string installation for fluid injection would include a complex Bottom Hole Assembly including valves, which would he arranged in the part of the wellbore filled with liquid, and which is prone to blockages. Another benefit is significantly reduces the cost of because no separate Capillary coil running equipment is needed.
  • the embodiment discussed hereinabove relates to a gas production well, but the invention can also be beneficial in a hydrocarbon fluid production well wherein the fluid comprises oil, such as an oil well or a well producing oil and gas.
  • the fluid comprises oil, such as an oil well or a well producing oil and gas.
  • oil such as an oil well or a well producing oil and gas.
  • water or brine component in the produced fluid.
  • surfactants or other chemical agents can be injected as treating fluids, such as to enhance production and/or dissolve liquid and/or solid components.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
EP16195215.5A 2016-10-24 2016-10-24 Procédé et système d'injection d'un fluide de traitement dans un puits Withdrawn EP3312380A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16195215.5A EP3312380A1 (fr) 2016-10-24 2016-10-24 Procédé et système d'injection d'un fluide de traitement dans un puits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16195215.5A EP3312380A1 (fr) 2016-10-24 2016-10-24 Procédé et système d'injection d'un fluide de traitement dans un puits

Publications (1)

Publication Number Publication Date
EP3312380A1 true EP3312380A1 (fr) 2018-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16195215.5A Withdrawn EP3312380A1 (fr) 2016-10-24 2016-10-24 Procédé et système d'injection d'un fluide de traitement dans un puits

Country Status (1)

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EP (1) EP3312380A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7198099B2 (en) 2003-11-07 2007-04-03 Shell Oil Company Method and system for injecting a treatment fluid into a well
US20080271893A1 (en) * 2005-06-08 2008-11-06 Bj Services Company, U.S.A. Method and Apparatus for Continuously Injecting Fluid in a Wellbore While Maintaining Safety Valve Operation
US20150000929A1 (en) * 2012-02-14 2015-01-01 Shell Oil Company Method for producing hydrocarbon gas from a wellbore and valve assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7198099B2 (en) 2003-11-07 2007-04-03 Shell Oil Company Method and system for injecting a treatment fluid into a well
US20080271893A1 (en) * 2005-06-08 2008-11-06 Bj Services Company, U.S.A. Method and Apparatus for Continuously Injecting Fluid in a Wellbore While Maintaining Safety Valve Operation
US20150000929A1 (en) * 2012-02-14 2015-01-01 Shell Oil Company Method for producing hydrocarbon gas from a wellbore and valve assembly

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