The low pressure, medium-low permeable reservoirs, which make a good percentage in China, play an important role in expending reserves and increasing production. The foam fluid, which is widely used in the world, is one of the low density drilling fluids that is required to explore and develop this kind of reservoir.

This paper contains a description of the evaluation of the foam fluid available,- the study of the foam formula and its stability. The development of a computer program, the tests on a simulating well and the up-dated field application of foam in oil fields are also described.

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