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Double walled screen-filter with perforated joints

  • US 4,526,230 A
  • Filed: 08/02/1982
  • Issued: 07/02/1985
  • Est. Priority Date: 08/06/1981
  • Status: Expired due to Fees
First Claim
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1. A double wall screen filter adapted to be installed in a hole formed in fluid bearing formations and to prevent sanding and silting-in during production, comprising:

  • (a) a pair of spaced, substantially concentric and cylindrical perforated screen members positioned to define an annular filter space therebetween;

    (b) filter means substantially filling the annular filter space for filtering particulate materials from fluid flowing through it, the particulate materials having a tendency to pass into a well;

    (c) upper joint means for sealing the upper end of said annular filtering space above the filtering means; and

    (d) lower joint means for connecting together lower end portions of said screen members and supporting said filter means, the lower joint means including an annular ring extending between the lower portions to join the inner and outer screen members together and said annular ring having passages for enabling passage of the particulate materials in the filter space to a sedimentation area of the hole below the filter.

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