E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/08 (2006.01) E21B 23/00 (2006.01) E21B 43/10 (2006.01)
Patent
CA 2041788
ABSTRACT Fig. 1 Deployment and Recovery of Pre-Packed Screens A bottom hole assembly (BHA) comprises pre-packed screen 1, washpipe 2 and stinger section 3. The screen has an outer fluid permeable wall 4, an inner permeable wall 5 and an annular layer of pre-packed particulate material 6 therebetween. Fluid can flow radially inwardly through the screen into the annual space 7 between the screen inner wall and the washpipe outer wall. Washpipe sections are coupled by a subsection of pipe 8. The ends of the coupling are joined to respective ends of sections of washpipe by conventional means. Screen sections are joined together by a stinger. Conventional joining means may be used. The stinger has a portion of its length necked down, and this portion has a polished sealing surface 9 which can provide a contact seal to a pair of appropriately sized pipe rams (not shown). Internally of the stinger, at the same level as the external sealing surface, there is an internal polished sealing surface. An annular seal 10 carried on a sub-unit 8 forms a contact seal on this internal sealing surface. Thus, fluid from the annular space 7 cannot pass by the seal 10. A method for deployment of a BHA as described above is disclosed. m e BHA may be deployed in an oil/gas well under pressure.
Dowell Schlumberger Canada Inc.
Smart & Biggar
LandOfFree
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