EP1336029A1 - Appareil de filtration a utiliser dans des puits d'eau - Google Patents

Appareil de filtration a utiliser dans des puits d'eau

Info

Publication number
EP1336029A1
EP1336029A1 EP01980735A EP01980735A EP1336029A1 EP 1336029 A1 EP1336029 A1 EP 1336029A1 EP 01980735 A EP01980735 A EP 01980735A EP 01980735 A EP01980735 A EP 01980735A EP 1336029 A1 EP1336029 A1 EP 1336029A1
Authority
EP
European Patent Office
Prior art keywords
wellscreen
base pipe
filter
wrap
disposed
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Withdrawn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
EP01980735A
Other languages
German (de)
English (en)
Inventor
A. Wayne Di Buckner
Daniel M. Parris
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.)
Weatherford Lamb Inc
Original Assignee
Weatherford Lamb Inc
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 Weatherford Lamb Inc filed Critical Weatherford Lamb Inc
Publication of EP1336029A1 publication Critical patent/EP1336029A1/fr
Withdrawn legal-status Critical Current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
    • E21B43/02—Subsoil filtering
    • E21B43/08—Screens or liners
    • E21B43/082—Screens comprising porous materials, e.g. prepacked screens

Definitions

  • This invention relates to filter apparatus for use in water wells to filter contaminants. More particularly, the invention relates to wellscreen for use in water wells.
  • Water wells are drilled to access water producing strata. As water is recovered, contaminants from the wellbore are also retrieved at the surface of the well. Because of their abrasive nature, contaminants can cause wear and tear on production . tubing, pumps, valves and other equipment associated with producing water wells. Controlling and reducing the amount of contaminants reduces valuable time and expense associated with water wells.
  • FIG. 1 is a sectional view showing a conventional wellscreen used in a water well.
  • the water well 10 includes a well head
  • Production string 13 is disposed coaxially within the casing 12. Disposed at a lower end of production string
  • 13 is a submersible pump 17 to pump the water to the surface, a wellscreen 18 to filter particulates and other contaminants, an electric motor 19 to drive the submersible pump
  • Wellscreen 18 acts as a barrier to contaminants entering the production string 13 thereby protecting the submersible pump 17, and other production equipment.
  • Wellscreens typically include a perforated base pipe with at least one layer of screen- like material wrapped therearound.
  • An annulus 22 is formed between the wellscreen 18 and the casing 12.
  • the annulus 22 is shown with a gravel pack 43 therein.
  • the gravel acts as a filter layer and in addition to the wellscreen, prevents contaminants from entering the production string 13.
  • a gravel pack is usually necessary to more effectively prevent the entry of particles into the production string.
  • a wellbore 's diameter must be large enough to accommodate both a wellscreen and the required space to hold the gravel pack.
  • under reaming digging below the lower end of a wellscreen to make room for gravel
  • gravel pack operations do not always result in a completely filled annular area, thereby decreasing the effectiveness of the filtering of contaminants.
  • Conventional wellscreens used in water wells are also subject to failure and can collapse due to hydrostatic pressure.
  • water bearing strata may be formed at such depths below the surface that wellscreens are subjected to relatively large amounts of hydrostatic pressure. These pressures result in high stresses in a radial direction, which may cause the wellscreen to deform or collapse.
  • one small area of the wellscreen is structurally compromised from damage during placement, a catastrophic failure of the wellscreen in use can result, thereby necessitating cost and time to replace the wellscreen.
  • the present invention generally provides a wellscreen for use in water wells.
  • the wellscreen includes a perforated base pipe, an inner wrap and an outer wrap with a filter material packed in an annular area therebetween.
  • the filter material provides additional filtering of fluids passing therethrough and also makes the wellscreen more resistant to collapse.
  • Figure 1 is a sectional view showing a conventional wellscreen in a water well
  • Figure 2 is a cross-sectional view of a wellscreen in accordance with the present invention.
  • Figure 2 is a cross-sectional view of one embodiment of the wellscreen of the present invention.
  • a base pipe 31 has radially extending perforations 33 therethrough and a first set of rods 38 disposed longitudinally on the outer surface thereof.
  • the first set of rods 38 separate the pipe 31 from an inner wrap 32.
  • a filter material 36 is disposed between the inner wrap 32 and an outer wrap 34.
  • a second set of rods 39 are attached longitudinally to the inner surface of the outer wrap 34 to provide structural support.
  • the wraps 32, 34 may be constructed of any material that can be concentrically formed to allow the passage of the desired fluids into a production string, while remaining substantially impermeable to particulate matter.
  • Example of material includes metal wire, sintered fibres, ceramic materials, woven polymer fabrics or Dutch twill weaves. While the base pipe 31 is perforated in the embodiment illustrated, the base pipe 31 may be slotted or may include perforations of any shape so long as the perforations therethrough permit the passage of production fluid but inhibit the passage of particles.
  • the filter material 36 between the wraps 32, 34 may include any material disposable in an annular area and capable of filtering contaminants from the production fluids.
  • Filter material 36 includes a gravel pack, silica sand, stainless steel shots, plastic beads, ceramic beads, glass beads, any combination thereof or any similarly functioning material. Because the filter material 36 is pre-packed into the wellscreen 180, the uniformity of material causes it to be more effective as a filter. Although the current invention may be practised in conjunction with a gravel pack, the filter material 36 can eliminate the need and expense of a gravel pack around the exterior of the wellscreen. Because a gravel pack is not required, the diameter of a wellbore can be smaller to accommodate only a wellscreen with no additional annular space needed for a gravel pack.
  • the wellscreen 180 of the present invention is also more robust than conventional wellscreens because filter material 36 functions to re-distribute and generalise any localised stress. For example, when a localised, radial stress acts upon the outer wrap 34 of the wellscreen 180, the stress is distributed throughout the tightly and uniformly packed filter material 36, thereby reducing the effect of the stress on the inner wrap 32. Because the localised stresses are no longer focused, but are distributed throughout the wellscreen 180, the life of the wellscreen 180 is extended.
  • test wellscreen is placed in a pressure vessel. Plugging agents designed to simulate contaminants and prevent flow through the wellscreen are introduced into the pressure vessel. The plugging agents surround the wellscreen and the pressure differential is measured between the outside and the inside of the wellscreen to ensure flow into the wellscreen is completely blocked. Thereafter, additional pressure is applied to the outer surface of the wellscreen and is increased until the wellscreen collapses. The collapse pressure is recorded and the wellscreen is removed and inspected for damage.
  • Table 1 illustrates that a conventional wellscreen collapses at a pressure differential of 186 p.s.i. (1.28 MPa), while the wellscreen of the present invention having the characteristics and structures illustrated in Figure 2 collapses at a significantly higher-pressure differential of 3,000 p.s.i. (20.7 MPa), or sixteen times the collapse pressure of a conventional wellscreen.
  • the data illustrates that by using the wellscreen described herein, the wellscreen can withstand greater hydrostatic pressure than a conventional wellscreen, thereby decreasing costs and time associated with water well production.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention concerne généralement un filtre à utiliser dans des puits d'eau. Dans un mode de réalisation de l'invention, ledit filtre comprend un tuyau de base perforé (31), une enveloppe intérieure (32) et une enveloppe extérieure (34) comportant une matière filtrante (36) logée dans une zone annulaire située entre les deux enveloppes. Ladite matière filtrante permet une filtration supplémentaire des liquides qui la traversent et rend également le filtre plus résistant à l'écrasement.
EP01980735A 2000-11-22 2001-11-07 Appareil de filtration a utiliser dans des puits d'eau Withdrawn EP1336029A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US72147400A 2000-11-22 2000-11-22
US721474 2000-11-22
PCT/GB2001/004937 WO2002042604A1 (fr) 2000-11-22 2001-11-07 Appareil de filtration a utiliser dans des puits d'eau

Publications (1)

Publication Number Publication Date
EP1336029A1 true EP1336029A1 (fr) 2003-08-20

Family

ID=24898133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980735A Withdrawn EP1336029A1 (fr) 2000-11-22 2001-11-07 Appareil de filtration a utiliser dans des puits d'eau

Country Status (5)

Country Link
EP (1) EP1336029A1 (fr)
AU (1) AU2002212523A1 (fr)
CA (1) CA2423766A1 (fr)
NO (1) NO20031279L (fr)
WO (1) WO2002042604A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102155193B (zh) * 2003-06-17 2013-07-03 科姆普利申制品私人有限公司 井滤网
DE102007041635A1 (de) * 2007-09-03 2009-03-12 Ochs Bohrgesellschaft Mbh Verwendung von Glaskugeln zur Füllung des Ringraumes zwischen Filterrohr und Bohrlochwand bei Bohrungen zur Wassergewinnung
CN101899967B (zh) * 2010-08-11 2013-05-15 中国水利水电科学研究院 在弱含水层中增加出水量的成井工艺
CN114809996B (zh) * 2022-04-27 2022-12-13 西南石油大学 一种用于海洋水合物生产的防砂装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2401327B2 (de) * 1974-01-11 1977-01-13 Verfahren zum verteilen der in einen brunnen eingezogenen wassermenge und vorrichtung zur durchfuehrung des verfahrens
US5004049A (en) * 1990-01-25 1991-04-02 Otis Engineering Corporation Low profile dual screen prepack
US5339895A (en) * 1993-03-22 1994-08-23 Halliburton Company Sintered spherical plastic bead prepack screen aggregate
US5738170A (en) * 1996-09-03 1998-04-14 United States Filter Corporation Compact double screen assembly
US5855242A (en) * 1997-02-12 1999-01-05 Ameron International Corporation Prepacked flush joint well screen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0242604A1 *

Also Published As

Publication number Publication date
AU2002212523A1 (en) 2002-06-03
NO20031279D0 (no) 2003-03-20
WO2002042604A1 (fr) 2002-05-30
CA2423766A1 (fr) 2002-05-30
NO20031279L (no) 2003-07-09

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