New deep gas well design which permits use of the most advanced completion techniques
A new concept in deep gas-well completions permits better stimulation attempts which can result in significant increases in well productivity. Use of 4-1/2 in. tubing and liner as a production string makes it possible to perforate a well with a large OD gun (offering larger holes and better penetration than a through-tubing gun) while maintaining a pressure differential into the well bore (underbalanced condition). Perforating with the pressure differential into the formation (overbalanced condition) can result in perforations plugged with foreign material and, if the foreign material is insoluble in acid, productivity impairment can result. Perforating underbalanced is desirable in certain formations and improves the possibility that the perforations are open. The 4-1/2 in. tubulars make possible high rate treatments. It has been recognized that pumping rate is a significant factor in determining the distance live acid will penetrate down a vertical fracture. Deeper penetration of live acid maximizes the effective well bore radius which increases well productivity.
- Research Organization:
- Shell Oil Co
- OSTI ID:
- 5596397
- Report Number(s):
- CONF-710478-
- Journal Information:
- Am. Pet. Inst., Publ.; (United States), Conference: 18. annual Southwest petroleum short course meeting, Lubbock, TX, USA, 15 Apr 1971
- Country of Publication:
- United States
- Language:
- English
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Larger ID tubulars boost deep gas well production
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