--> Abstract: Wireline Coring For Reduction Of Formation Damage In Under-Pressured Reservoirs, by D. L. Nielson, D. M. Thomas, M. Pardey, and B. Howell; #90928 (1999).

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NIELSON, DENNIS L.1, DONALD M. THOMAS2, MARSHALL PARDEY3, and BRUCE HOWELL4
1DOSECC, Inc., and University of Utah, Salt Lake City, UT
2University of Hawaii, Honolulu, HI
3QD Tech, Inc., Salt Lake City, UT
4Turnsteel of Idaho, Rexburg, ID

Abstract: Wireline Coring for Reduction of Formation Damage in Under-Pressured Reservoirs

A recently fabricated wireline coring system may be particularly valuable in preventing damage to under-pressured reservoirs. The DOESCC Hybrid Coring System (DHCS) was developed under funding from the National Science Foundation to collect continuous core from deep research wells drilled for scientific sampling and monitoring. In petroleum exploration and development, formation damage could be minimized because thin-kerf diamond bits employed by the system produce very fine cuttings, and, importantly, most of the rock volume is removed as core. The uniqueness of the DHCS lies in both its depth capability and its adaptability to standard oil field equipment that is required for petroleum exploration and development. The DHCS utilizes a hydraulic top-drive that attaches to the elevators of a conventional rotary drilling rig. The top drive has variable rotational speeds and can precisely control the weight on bit. The rotary rig is used for hole opening, setting casing, tripping the drill string and performing cementing, lost circulation control and completion operations. By using the strengths of both the rotary rig and the coring system, the DHCS has the capability of continuous coring to depths of 20,000 feet. An additional advantage of this system is that it collects continuous high-quality core that is invaluable for reservoir characterization.

AAPG Search and Discovery Article #90928©1999 AAPG Annual Convention, San Antonio, Texas