Double walled screen-filter with perforated joints
First Claim
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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Accused Products
Abstract
A well screen-filter includes a pair of substantially spaced concentric screens defining an annular filtering space therebetween, connected with perforated joint(s) closing the lower end of the filtrating space. The annular space is filled with filtrating materials (gravel or synthetic balls) as a pack and an upper joint acts as a cover cap of the annular filtrating space to seal the pack. The lower perforated joint includes holes for passage of fine particles to a sedimentation tube, preventing clogging of the pack and enabling proper functioning of the double walled screen-filter.
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Citations
8 Claims
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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:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification