Well completion apparatus and method
A production casing string is composed of an upper section and a smaller diameter lower section. The lower portion of the upper section forms upper and lower polished bore receptacles. The upper receptacle has an internal bore of larger diameter than the bore of the lower receptacle. A first annular shoulder is formed at the junction of the bores. A support shoulder is formed in the lower receptacle at the junction of the bore of the lower receptacle and the inner wall of the lower section. A hanger seat member is positioned on the support shoulder. An outer tubing string positioned in the production casing string has a reduced diameter stinger section provided with an annular external seal unit which sealingly engages the bore wall of the lower receptacle. A second annular shoulder is formed on the outer wall of the outer tubing string at the junction of the outer walls of the outer tubing string and the stinger section. When the outer tubing string is positioned in the production casing string, the lower end of the stinger section is spaced a selected distance above the hanger seat member and the second annular shoulder is spaced a selected distance above the first annular shoulder. A third annular shoulder is formed in the outer tubing string at the junction of the inner walls of the outer tubing string and the stinger section. An inner tubing string, provided with upper and lower spaced-apart outer fluted hangers, extends through the outer tubing string into the production casing string. The inner tubing string is positioned such that the lower fluted hanger seats on the hanger seat member and the upper fluted hanger is spaced a selected distance above the third annular shoulder.
- Assignee:
- Exxon Production Research Co.
- Patent Number(s):
- US 4501330
- OSTI ID:
- 5637745
- Resource Relation:
- Patent File Date: Filed date 3 Feb 1984; Other Information: PAT-APPL-576827
- Country of Publication:
- United States
- Language:
- English
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