EP3177805A1 - Bohrlochsystem - Google Patents

Bohrlochsystem

Info

Publication number
EP3177805A1
EP3177805A1 EP15829547.7A EP15829547A EP3177805A1 EP 3177805 A1 EP3177805 A1 EP 3177805A1 EP 15829547 A EP15829547 A EP 15829547A EP 3177805 A1 EP3177805 A1 EP 3177805A1
Authority
EP
European Patent Office
Prior art keywords
well
gas
water
water production
lower portion
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Withdrawn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
EP15829547.7A
Other languages
English (en)
French (fr)
Other versions
EP3177805A4 (de
Inventor
Christopher James CONNELL
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.)
Individual
Original Assignee
Individual
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
Priority claimed from AU2014903009A external-priority patent/AU2014903009A0/en
Application filed by Individual filed Critical Individual
Publication of EP3177805A1 publication Critical patent/EP3177805A1/de
Publication of EP3177805A4 publication Critical patent/EP3177805A4/de
Withdrawn legal-status Critical Current

Links

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
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/006—Production of coal-bed methane
    • 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
    • E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • 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
    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C41/00—Methods of underground or surface mining; Layouts therefor
    • E21C41/16—Methods of underground mining; Layouts therefor
    • E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00—Drainage
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

Definitions

  • the invention relates to a well system.
  • the invention relates to a Coal Bed Methane (CBM) well system.
  • CBM Coal Bed Methane
  • CBM also referred to as coalbed gas, coal seam gas or coal-mine methane is a form of natural gas extracted from coal seams.
  • CBM is distinct from other types of gas, as the methane is stored within the coal by a process called adsorption.
  • adsorption When a coal seam is put into production, water in the fractured or cleated spaces is pumped off first. This leads to a reduction of pressure enhancing desorption of gas from the coal seam.
  • Existing wells for Coal Bed Methane typically have a steel encased hole that is drilled into a coal seam.
  • a submerged pump located towards the bottom of the steel encased hole is used to pump the produced water through tubing in the hole to the surface.
  • a disadvantage with existing CBM wells is that capital equipment costs are quite high due to the number of wells that need to be drilled.
  • Another disadvantage is that tubing for the produced water and the submerged pump can obstruct reservoir surveillance activities.
  • At least one gas well extending from a ground surface into the ground; a water production well extending from a surface into the ground; and a water drainage well fluidly connecting the at least one gas well to the water production well.
  • the well system is a coal bed methane well system.
  • the water production well comprises a pump towards a lower end thereof.
  • water and/or other liquids that flow into the gas well flow through the water drainage well and into the water production well.
  • the water production well pump pumps the water and/or other liquids in the water production well to the surface.
  • the water production well pump pumps the water and/or other liquids in the water production well to the surface through tubing located within the water production well.
  • a reference to water also includes other liquids that may be present.
  • water and other liquids that are present in a coal seam are also included.
  • water in the gas well below a point where the water drainage well is fluidly connected to the gas well may not flow through the water drainage well and water below the pump in the water production well may not be pumped to the surface. Additionally, it will be appreciated that some water may be present in the gas that is produced to the surface.
  • the water production well is a vertical water production well.
  • a vertical water production well includes a water production well that is substantially vertical.
  • the water production well may be a deviated water production well.
  • the water production well may be used to also convey gas from an annulus (the void between a casing of the water production well and the tubing located within the water production well) to the surface.
  • the at least one gas well is a plurality of gas wells.
  • each of the at least one gas well intersects a coal seam.
  • each of the at least one gas well is cased.
  • each of the at least one gas well is cased in a steel casing.
  • each casing has perforated portions where it intersects the coal seam(s) to enable gas and water from the coal seam to flow into the at least one gas well.
  • each of the at least one gas well intersects a plurality of coal seams.
  • each of the at least one gas well is a vertical gas well.
  • a vertical gas well includes a gas well that is substantially vertical.
  • each of the at least one gas well may be a deviated gas well, or the at least one gas well may be a plurality of gas wells comprising one or more vertical and deviated gas wells.
  • each of the at least one gas well will comprise a wireline entry guide.
  • the wireline entry guide is located towards an upper end of the corresponding gas well.
  • a wireline entry guide is a fitting on the end of a tubing string that is shaped to assist with the retrieval of reservoir surveillance tools when pulled upwards into the tubing string from the wellbore below.
  • the water drainage well fluidly connects a lower portion of each of the at least one gas well to a lower portion of the water production well.
  • the water drainage well is inclined to assist the flow of water from the at least one gas well to the water production well.
  • the water drainage well may be inclined in a downward direction from where it is fluidly connected to the at least one gas well to where it is fluidly connected to the water production well.
  • the water drainage well may be oriented in a substantially horizontal orientation or be inclined upwardly toward the water drainage well, although this is undesirable, due to more water potentially remaining in the at least one gas well, the water can still flow into the water production well due to hydrostatic pressures.
  • the water drainage well is lined or cased. For example , a steel, glass reinforced epoxy casing or the like.
  • the water drainage well is open to a lower portion of the water production well.
  • the invention relates to a method of forming a well system comprising the steps of:
  • the well system is a coal bed methane well system.
  • the step of providing at least one gas well extending from a ground surface into the ground includes the step of removing a pump and associated tubing from each of the at least one gas well.
  • the step of drilling a water drainage well such that the water drainage well fluidly connects a lower portion of each of the at least one gas well to a lower portion of the water production well involves drilling the water drainage well from a lower portion of one of the at least one gas well into a lower portion of the water production well.
  • FIG 1 shows a schematic view of a well system according to the present invention.
  • the CBM well system 100 has gas wells 1 10, 1 12 that extend from a surface 12 into the ground and into coal seams 14.
  • a water production well 1 14 extends from the surface 12 into the ground.
  • a water drainage well 1 16 fluidly connects the gas wells 1 10,1 12 to the water production well such that water (water flow indicated by arrows 18) can flow from the gas wells 1 10,1 12 through the water drainage well 1 16 and into the water production well 1 14.
  • water is pumped by a pump 1 18 through tubing 120 to the surface 12.
  • Gas wells 1 10,1 12 are drilled from the surface 12 through coal seam 14.
  • the gas wells each have a casing 122.
  • the casings have perforations 124 adjacent the coal such that the gas (gas flow indicated by arrows 16) and the water in the coal seam can flow into the gas wells 1 10,1 12.
  • Gas wells 1 10,1 12 have wireline entry guides 126 fitting on the ends of tubing strings 128.
  • the wireline entry guides 126 assist with the retrieval of reservoir surveillance tools (not shown) when they are pulled upwards towards the well head 130.
  • the water drainage well 1 16 is drilled from a lower portion of the gas well 1 10 and into the water production well 1 14.
  • the water drainage well 1 16 also intersects the gas well 1 12.
  • the casing 122 of gas well 1 12 does not extend to the bottom of gas well 1 12, instead it stops just above the water drainage well 1 16. In this manner, the drilling of the water drainage well is not impeded by the casing 122 of gas well 1 12.
  • the water drainage well 1 16 has a liner 132 that is attached to the lower portion of the gas well 1 10.
  • the liner 132 has perforations 134 where the water drainage well 1 16 intersects the gas well 1 12 such that water can flow from the gas well 1 12 into the water drainage well 1 16.
  • the water production well 1 14 is drilled from the surface 12 into the ground.
  • the water production well 1 14 has a casing 136.
  • the casing 136 is open to the water drainage well 1 16 such that water can flow from the water drainage well 1 16 into a lower portion of the water production well 1 14 where the pump 1 18 is located, which pumps the water through the tubing 120 to the well head 138 on the surface 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Remote Sensing (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
EP15829547.7A 2014-08-04 2015-07-23 Bohrlochsystem Withdrawn EP3177805A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2014903009A AU2014903009A0 (en) 2014-08-04 A well system
PCT/AU2015/050415 WO2016019427A1 (en) 2014-08-04 2015-07-23 A well system

Publications (2)

Publication Number Publication Date
EP3177805A1 true EP3177805A1 (de) 2017-06-14
EP3177805A4 EP3177805A4 (de) 2018-03-21

Family

ID=55262923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15829547.7A Withdrawn EP3177805A4 (de) 2014-08-04 2015-07-23 Bohrlochsystem

Country Status (5)

Country Link
US (1) US20170226840A1 (de)
EP (1) EP3177805A4 (de)
AU (1) AU2015299753A1 (de)
CA (1) CA2956965A1 (de)
WO (1) WO2016019427A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107035401B (zh) * 2017-05-26 2018-04-10 中节能宁夏新能源股份有限公司 一种废弃矿井井下瓦斯治理新工艺
CN109184782B (zh) * 2018-11-07 2020-11-13 孔维一 虹吸式抽采管路排渣放水器
CN109577941B (zh) * 2018-11-23 2022-04-29 北京奥瑞安能源技术开发有限公司 煤层气钻采方法
CN109339746B (zh) * 2018-12-07 2020-08-25 中国矿业大学 一种顶板离层水与煤系气协同疏排方法
CN111119979B (zh) * 2019-12-08 2021-12-03 山西晋煤集团技术研究院有限责任公司 小流量瓦斯抽采钻孔精确测量系统
CN111520140A (zh) * 2020-04-27 2020-08-11 中国矿业大学 一种基于注气驱替强化电脉冲致裂的石门揭煤方法
CN111945853B (zh) * 2020-08-31 2021-08-03 深圳瑞尔康生物科技股份有限公司 一种隧道积水后快速通车装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4422505A (en) * 1982-01-07 1983-12-27 Atlantic Richfield Company Method for gasifying subterranean coal deposits
US6280000B1 (en) * 1998-11-20 2001-08-28 Joseph A. Zupanick Method for production of gas from a coal seam using intersecting well bores
US8297377B2 (en) * 1998-11-20 2012-10-30 Vitruvian Exploration, Llc Method and system for accessing subterranean deposits from the surface and tools therefor
WO2002083928A2 (en) * 2001-04-10 2002-10-24 Agensys, Inc. Nucleid acid and corresponding protein entitled 158p3d2 useful in treatment and detection of cancer
CA2525850C (en) * 2003-06-09 2013-02-19 Precision Drilling Technology Services Group, Inc. Method for drilling with improved fluid collection pattern
US7222670B2 (en) * 2004-02-27 2007-05-29 Cdx Gas, Llc System and method for multiple wells from a common surface location
US7493951B1 (en) * 2005-11-14 2009-02-24 Target Drilling, Inc. Under-balanced directional drilling system
EA201290503A1 (ru) * 2009-12-15 2012-12-28 Шеврон Ю.Эс.Эй. Инк. Система, способ и компоновка для техобслуживания и эксплуатации стволов скважин

Also Published As

Publication number Publication date
US20170226840A1 (en) 2017-08-10
CA2956965A1 (en) 2016-02-11
EP3177805A4 (de) 2018-03-21
AU2015299753A1 (en) 2017-02-23
WO2016019427A1 (en) 2016-02-11

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