Improved productivity justifies world record underbalanced perforating operation

Citation
Am. Johnson et al., Improved productivity justifies world record underbalanced perforating operation, J CAN PET T, 40(5), 2001, pp. 54-59
Citations number
6
Categorie Soggetti
Geological Petroleum & Minig Engineering
Journal title
JOURNAL OF CANADIAN PETROLEUM TECHNOLOGY
ISSN journal
00219487 → ACNP
Volume
40
Issue
5
Year of publication
2001
Pages
54 - 59
Database
ISI
SICI code
0021-9487(200105)40:5<54:IPJWRU>2.0.ZU;2-1
Abstract
A Dutch onshore gas well was drilled to a total depth of 5,136 m along hole (3,700 m true vertical depth) with a maximum deviation of 89 degrees. The well was completed with 193.7 mm (7 5/8 in.) 13% chrome (Cr13) tubing with a 177.8 mm (7 in.) cemented liner across the reservoir providing full bore access to the pay zone. Due to the very stratified nature of the reservoir, the long-term sustained production depended on achieving vertical connecti vity with all the layers. In order to achieve this and maximize productivit y, a single run underbalanced perforating operation was required. Due to co iled tubing limitations in this deep, high pressure well, a hydraulic worko ver unit was selected to deploy and retrieve the guns. A total gross interv al of 1,026 m was perforated in one run utilizing 85.725 mm (33/8 in.) deep penetrating guns and thereafter snubbed from the well under live condition s (46 MPa at surface). To date, it is understood that this is the longest s ection of guns conveyed, fired underbalanced, and deployed out of a live we ll. This paper addresses the perforating technique selection, the planning and execution process, the major operational learning points, and discusses final productivity results which demonstrate the validity of this techniqu e.