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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 10 (1926)

Issue: 5. (May)

First Page: 513

Last Page: 530

Title: Core Drilling for Structure in the North Mid-Continent Area

Author(s): H. G. Officer, Glenn C. Clark, F. L. Aurin

Abstract:

Application:
Principally used in Permian outcrops of northwest Oklahoma and southern Kansas.

History and development:
Description of first equipment used. Success attendant early use caused adoption by many large operators. More than thirty-five drills now being operated in Oklahoma and Kansas. Present equipment fairly well standardized. Deeper drilling will necessitate heavier machines. Gasoline motor-driven drill, the use of mud fluid, and application of hard alloys on fishtail bit surfaces principal developments of 1925. The use of separate pumps for hydraulics will probably soon be adopted.

Methods of operation:
Organization: Description of organization and how it functions as a part of the geological department. Types of equipment used: Some operators prefer steam drills. Majority prefer gasoline-driven drills mounted on wheels. Portability a desirable feature. Self-propelling drills being used successfully. All drills use N rods and cut 2-inch core. Use of mud eliminates use of casing. The amount of core recovered is reduced to a minimum consistent with conservative correlations. Fishtailing has reduced costs. Application of special alloys to fishtail bits has increased footage per bit two or three times.

Procedure:
Description of procedure in making a location, rigging up, drilling, etc., key beds, correlations, logs, elevations, and maps.

Costs:
Estimates of costs of equipment. Wages. Fuel. Repairs. Costs analyzed. Cost per month is most important and inflexible of all costs. Costs per foot of hole, or per acre, depend on the area in which drilling is done. Comparative costs hard to obtain.

Results obtained:
Productive structures found with the aid of core drill. Structures found with the core drill which are now being tested.

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