Sand control devices and method of installation thereof
This patent describes a double walled sand control filter for installation in fluid bearing formations to prevent sanding and silting in during production, which consists of: (a) a pair of inner and outer spaced, substantially concentric screen members positioned to define an annular filter spaced therebetween adapted to contain a filtering medium for filtering sand and particulate materials having tendency to pass into a well, the filtration medium tending to be subjected to compaction during production of formation fluids; (b) means for connecting the inner and outer screens together so that the openings within the outer screen extend to a maximum elevational position E1 higher than the maximum elevational E2 of the openings in the inner screen; (c) means for defining a sedimentation area below the filter into which particulate materials filtered from formation fluid with the annular filter space pass to allow the filtrating medium to remain essentially unclogged by the particulate materials. A method is described for installing a sand control filter within an existing well bore formed within a fluid bearing formation, which consists of: (a) cleaning the well bore by removing sand tending to collect in the bottom of the well; (b) placing a wash down media into the bottom of the well, the wash down media substantially consisting of loose glass or polymer spheres; (c) installing into the well the sand control filter carrying a wash pipe and a jet shoe connected below the filter; (d) injecting a working fluid in sufficient quantities through the wash pipe for ejection through the jet shoe to displace the wash down media and allow the jet shoe to settle to the well bottom.
- Assignee:
- Well Improvement Specialists, Inc., Houston, TX
- Patent Number(s):
- US 4693318
- OSTI ID:
- 5968473
- Resource Relation:
- Patent File Date: Filed date 10 Oct 1985
- Country of Publication:
- United States
- Language:
- English
Similar Records
Setting screens in rotary drilled wells
Sand control devices and method of installation thereof