Innovative Concepts in Wireline Continuous Coring

Topics: Drilling operations
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Coring in unconventional reservoirs with typical unconsolidated formations has introduced additional challenges requiring more-innovative concepts to be developed. These requirements have recently led to widespread attention to wireline continuous coring (WCC), which was modified from the mining industry for petroleum-industry applications. This paper is aimed at identifying and addressing complications experienced in the use of WCC. In addition to the challenges and solutions discussed in this summary, others are covered in the complete paper.

Basic Bottom-Coring Methods

These methods, in the context of petroleum exploration, comprise conventional and WCC methods. Conventional coring is a method of rotary coring by which the inner tube containing the core is retrieved along with the outer-tube assembly to the surface following a conventional drillstring trip.

WCC is a method of coring or drilling by which the same outer assembly is used as the bottomhole assembly and the same core bit is applied for both drilling and coring modes; however, changing the inner assembly can be performed easily by wireline in order to switch to the desired mode. WCC has been identified recently as a less-time-consuming coring method to replace conventional coring in certain circumstances.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 180017, “Innovative Concepts in Wireline Continuous Coring,” by Rahman Ashena, Walter Vortisch, Michael Prohaska, and Gerhard Thonhauser, University of Leoben, prepared for the 2016 SPE Bergen One Day Seminar, Bergen, Norway, 20 April. The paper has not been peer reviewed.
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Innovative Concepts in Wireline Continuous Coring

01 August 2016

Volume: 68 | Issue: 8