1964 Paper J

PRODUCTION LOGGING AS APPLIED TO POST PRIMARY PRODUCTION

H. M. Bullard, R. D. Clarke, and D. H. Rush BIRDWELL, A Division of Seismograph Services Corporation

ABSTRACT

There are many problems that exist in a post primary project that cannot be identified with the employment of primary logging equipment. A Production Logging System has been developed that meets the mechanical requirements dictated by post primary well conditions. This system is capable of gathering data from a reservoir under dynamic conditions. This paper describes the requirements of personnel and equipment employed in such a system.

A discussion is presented covering the theory and application of three methods of injection well analysis.

Radioactive Tracer Surveys employ the use of radioactive isotopes in liquid and particle form. Isotope Mev level, Stokes' Law and experience are used in tailoring each survey. Special charts and graphs are used for quantitative interpretation. A particular well or reservoir condition will dictate the choice of Radioactive Tracer Survey to be used.

A flowmeter utilizing an inflatable packer and spinner is capable of making direct measurement of fluid flow within the borehole. It is unaffected by hole size, laminar or turbulent flow and direction of flow.

Temperature surveys are particularly valuable when used in conjunction with other methods. Because temperature of flowing fluids obey the laws of thermal conductivity, quantitative interpretation may be applied. An equation is presented for determining flow rates when the geothermal gradient is known. A group of hypothetical curves depicts temperature logs run under assumed well conditions.