EP3109398A1 - Flüssigkeitsentladeverfahren und -system - Google Patents

Flüssigkeitsentladeverfahren und -system Download PDF

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Publication number
EP3109398A1
EP3109398A1 EP15174090.9A EP15174090A EP3109398A1 EP 3109398 A1 EP3109398 A1 EP 3109398A1 EP 15174090 A EP15174090 A EP 15174090A EP 3109398 A1 EP3109398 A1 EP 3109398A1
Authority
EP
European Patent Office
Prior art keywords
liquid
downhole
tool
foaming agent
fluid
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Withdrawn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
EP15174090.9A
Other languages
English (en)
French (fr)
Inventor
Christian Krüger
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.)
Welltec AS
Original Assignee
Welltec AS
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 Welltec AS filed Critical Welltec AS
Priority to EP15174090.9A priority Critical patent/EP3109398A1/de
Publication of EP3109398A1 publication Critical patent/EP3109398A1/de
Withdrawn legal-status Critical Current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
    • E21B43/13—Lifting well fluids specially adapted to dewatering of wells of gas producing reservoirs, e.g. methane producing coal beds

Definitions

  • the present invention relates to a liquid unloading method for unloading liquid in a malfunctioning gas well having a top end and a bottom end and a gas production zone, the gas well having liquid accumulated in the bottom end and at least above the production zone. Furthermore, the present invention relates to a downhole liquid unloading system for unloading liquid in a malfunctioning gas well.
  • a liquid unloading method for unloading liquid in a malfunctioning gas well having a top end and a bottom end and a gas production zone, the gas well having liquid accumulated in the bottom end and at least above the production zone, the method comprising the steps of:
  • the liquid unloading method may further comprise the step of producing gas from the gas production zone up through the foam.
  • the step of providing the foaming agent may be performed by introducing the foaming agent from the top of the gas well.
  • the step of providing the foaming agent may be performed by submerging the downhole tool comprising the foaming agent into the liquid downhole and ejecting the foaming agent.
  • the step of arranging the downhole tool may be performed by means of a wireline, a driving unit, a drill pipe or coiled tubing.
  • the liquid unloading method may further comprise the step of detecting liquid by means of a detection unit of the downhole tool.
  • the step of agitating the fluid may be performed by reciprocating, rotating and/or lateral movements of a tool part of the downhole tool or the downhole tool, and/or by pumping or circulating the fluid by means of a tool pump of the downhole tool.
  • the liquid unloading method may further comprise the step of stopping agitating the fluid and detecting a flow of fluid.
  • the liquid unloading method may further comprise the step of deciding to retract the downhole tool or continue agitating the fluid.
  • liquid unloading method may further comprise the step of providing a second portion of foaming agent into the well.
  • the present invention furthermore relates to a downhole liquid unloading system for unloading liquid in a malfunctioning gas well, comprising:
  • the downhole liquid unloading system may further comprise a well pump arranged at the top for pumping the foaming agent into the gas well.
  • the downhole tool may comprise a chamber comprising the foaming agent to be partly or fully ejected into the gas well.
  • the downhole tool may comprise a tool pump configured to eject the foaming agent into the gas well and/or circulating the fluid in the gas well.
  • the downhole tool may comprise an inlet and an outlet.
  • the downhole liquid unloading system may further comprise a reciprocating means configured to agitate the fluid, the reciprocating means being arranged in the downhole tool or at the top.
  • the downhole liquid unloading system may further comprise a rotating means configured to agitate the fluid, the rotating means being arranged in the downhole tool or at the top.
  • the downhole liquid unloading system may further comprise a unit for generating lateral movements of the downhole tool.
  • the downhole tool may have a tool axis and comprise a tool body and a tool part which is rotatable and axially slidable along the tool axis or pivoting around a pivot point in relation to the tool body.
  • the tool part of the downhole tool may be or may comprise a brush, a whisk, an arm or an axial force generator.
  • the downhole tool may further comprise an anchor section or a downhole driving unit for propelling the downhole tool forward in the gas well.
  • the downhole tool may comprise a wireline, a drill pipe or coiled tubing.
  • the downhole tool may comprise a detection unit configured to detect liquid and/or a flow of fluid.
  • the downhole tool may comprise a logging unit configured to detect a position of the downhole tool or a content of the fluid.
  • the gas well may comprise a well tubular metal structure.
  • the well tubular metal structure may comprise annular barriers, each annular barrier comprising a tubular metal part mounted as part of the well tubular metal structure and an expandable metal sleeve surrounding the tubular metal part and connected at its ends to the tubular metal part, defining an annular space.
  • Fig. 1 shows a downhole liquid unloading system 100 comprising a malfunctioning gas well 1 having a top 11 and a bottom end 12 and a gas production zone 101.
  • the gas well 1 comprises a liquid 2 accumulated at the bottom.
  • water vapour tends to condensate on an inner face 27 of a well tubular structure 28 in a borehole 29 or on an inner face 30 of the borehole, as shown in Fig. 2 .
  • the vapour condensates into liquid, liquid is accumulated in the bottom end 12, and eventually, the liquid accumulates above the gas production zone 101, which causes the gas production to deteriorate or stop because the gas pressure in the production zone can no longer overcome the liquid column hydrostatic pressure.
  • a foaming agent 3 is provided on top of the liquid from the top of the well.
  • the foaming process sometimes never starts or it dies out after a short time.
  • a downhole tool 10 is arranged at least partly submerged in the liquid, as shown in Fig. 2 , for agitating a fluid of the foaming agent 3 and the liquid by means of the downhole tool 10.
  • foam 31 is formed of the liquid and the foaming agent 3 at least partly above the gas production zone 101.
  • the foaming agent 3 and the liquid are turned into foam, which causes the liquid column hydrostatic pressure to decrease enough for the gas well 1 to start producing gas from the gas production zone up through the foam and bringing gas and foam to the top of the well.
  • the gas production is initiated, the gas brings up the liquid in the form of foam, and the well is in this way unloaded of the liquid blocking the production zone 101.
  • the foaming agent 3 may be pumped by a well pump 51 or poured into the well from the top of the well, as shown in Fig. 1 , or the foaming agent may be provided by submerging the downhole tool comprising the foaming agent 3 and ejecting the foaming agent into the liquid downhole, as shown in Fig. 3 .
  • the foaming agent 3 is comprised in a chamber 16 in the downhole tool 10, and the foaming agent is partly or fully ejected into the gas well 1, as shown in Fig. 3 .
  • the downhole tool 10 may be arranged in the well by means of a wireline 42 as shown in Fig. 2 , a driving unit 43 as shown in Fig. 4 , a drill pipe 44 or coiled tubing as shown in Fig. 3 .
  • the agitation of the fluid is performed by reciprocating, rotating and/or lateral movements of a tool part 14 of the downhole tool 10, as shown in Fig. 3 , or the downhole tool itself, and/or by pumping or circulating the fluid by means of a tool pump 15 of the downhole tool, as shown in Fig. 2 .
  • the downhole tool has an inlet 17 for taking in gas or fluid if fully submerged and an outlet 18 for ejecting the foaming agent 3, as shown in Fig. 3 .
  • the tool part 14 may be a whisk which is rotated and/or moved up and down in the fluid and in this way whisk gas into fluid comprising the liquid and the foaming agent 3.
  • the downhole tool 10 comprises a detection unit 21, as shown in Fig. 2 .
  • the detection unit 21 is configured to detect liquid so that the downhole tool can be positioned partly, if not fully, submerged in the liquid.
  • the detection unit When the downhole tool 10 has agitated the fluid at some time, the agitation is stopped and after a period of time the detection unit then detects if the fluid has started to flow and thus if the gas production is initiated.
  • the detection unit may be configured to measure a flow velocity of the fluid. If the well has stated to produce gas again, the tool is retracted and if not the agitation is proceed. Before proceeding with the agitation, a second portion of foaming agent may be added to the fluid in the well.
  • the downhole liquid unloading system 100 further comprises a reciprocating means 19 configured to agitate the fluid.
  • the reciprocating means is arranged in the downhole tool in the form of an axial force generator 14d.
  • the tool part 14 of the downhole tool is a brush 14a reciprocated by the axial force generator 14d for forming foam.
  • the downhole tool 10 further comprises an anchoring section 25 for anchoring the tool during reciprocation or rotation, and in addition, the downhole tool further comprises a downhole driving unit 42a for propelling the downhole tool forward in the gas well 1.
  • the reciprocating means 19 is arranged at the top of the well and moves the drill pipe/coiled tubing up and down.
  • the downhole tool 10 comprises a rotating means 20 arranged in a tool body 23 and configured to agitate the fluid by rotating a tool part 14, such as an arm 14c.
  • the rotating means 20 may also be arranged at the top of the well, as shown in Fig. 3 .
  • the tool 10 comprises a unit 22 configured to provide lateral movements of a tool part 14, such as an arm 14c, of the downhole tool.
  • the tool part 14 is thus pivoting around a pivot point 24 in relation to the tool body.
  • the tool 10 comprises a logging unit 26 configured to detect a position of the downhole tool and/or a content of the fluid.
  • the gas well comprises a well tubular metal structure 28 comprising annular barriers 40.
  • Each annular barrier 40 comprises a tubular metal part 41 mounted as part of the well tubular metal structure 28 and an expandable metal sleeve 45 surrounding the tubular metal part and connected at its ends to the tubular metal part, defining an annular space 46.
  • the annular barriers of the system isolate the production zone 101, and one annular barrier provides a main barrier between the well tubular metal structure 28 and the intermediate casing 47 in the top of the well.
  • the annular barriers may be expanded by pressurised fluid from the well tubular metal structure entering through an opening in the tubular metal part into the space to expand the expandable sleeve.
  • the annular barriers may also be expanded by the annular space comprising at least one thermally decomposable compound adapted to generate gas or super-critical fluid upon decomposition. The compound may decompose upon heating the compound.
  • An axial force generator is a tool providing an axial force, such as a stroking tool.
  • the stroking tool comprises an electrical motor for driving a pump.
  • the pump pumps fluid into a piston housing to move a piston acting therein.
  • the piston is arranged on the stroker shaft.
  • the pump may pump fluid into the piston housing on one side and simultaneously suck fluid out on the other side of the piston.
  • fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
  • gas is meant any kind of gas composition present in a well, completion, or open hole
  • oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
  • Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
  • a casing or well tubular structure is meant any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
  • the casing or well tubular structure is mainly made of metal.
  • a driving unit such as downhole tractor
  • the downhole tractor may have projectable arms having wheels, wherein the wheels contact the inner surface of the casing for propelling the tractor and the tool forward in the casing.
  • a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP15174090.9A 2015-06-26 2015-06-26 Flüssigkeitsentladeverfahren und -system Withdrawn EP3109398A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15174090.9A EP3109398A1 (de) 2015-06-26 2015-06-26 Flüssigkeitsentladeverfahren und -system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15174090.9A EP3109398A1 (de) 2015-06-26 2015-06-26 Flüssigkeitsentladeverfahren und -system

Publications (1)

Publication Number Publication Date
EP3109398A1 true EP3109398A1 (de) 2016-12-28

Family

ID=53498834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15174090.9A Withdrawn EP3109398A1 (de) 2015-06-26 2015-06-26 Flüssigkeitsentladeverfahren und -system

Country Status (1)

Country Link
EP (1) EP3109398A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115945115A (zh) * 2022-12-16 2023-04-11 重庆科技学院 一种三级搅拌一级增速油套环空起泡装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070181307A1 (en) * 2006-02-09 2007-08-09 Jiang Yang Synergistic surfactant compositions for unloading fluids from oil and gas wells
US20100051288A1 (en) * 2008-09-03 2010-03-04 Baker Hughes Incorporated Low Rate Gas Injection System
US20120073820A1 (en) * 2010-09-29 2012-03-29 Rite Increaser, LLC Chemical Injector for Wells
US20150053410A1 (en) * 2013-08-23 2015-02-26 Chevron U.S.A. Inc. System, apparatus and method for well deliquification

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070181307A1 (en) * 2006-02-09 2007-08-09 Jiang Yang Synergistic surfactant compositions for unloading fluids from oil and gas wells
US20100051288A1 (en) * 2008-09-03 2010-03-04 Baker Hughes Incorporated Low Rate Gas Injection System
US20120073820A1 (en) * 2010-09-29 2012-03-29 Rite Increaser, LLC Chemical Injector for Wells
US20150053410A1 (en) * 2013-08-23 2015-02-26 Chevron U.S.A. Inc. System, apparatus and method for well deliquification

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115945115A (zh) * 2022-12-16 2023-04-11 重庆科技学院 一种三级搅拌一级增速油套环空起泡装置
CN115945115B (zh) * 2022-12-16 2024-05-17 重庆科技学院 一种三级搅拌一级增速油套环空起泡装置

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