At present operating position extensively adopt the
method of measuring pressure and well testing in advance of
shutting in and in order to acquire reservoir pressure and
reservoir parameters. However , this operation can’t be used
in gas well , because there is very high wellhead pressure in
some superhigh gas wells after shutting in ,which pipe wall
and wellhead device are difficult to bear so hish pressure. In
order to obtain satisfied pressures ,the low permeability of gas
well will be shut in some weeks ,which can seriously influence
the gas well’s production. It is a good method that we only
change its working conditions not to shut in so sa to get
bottom pressure , according as the porous medium gas
unstable infuent theory , to acquire the basic equation and
calculae to fit the past for purpose of ascertaining the average
stratum pressure at present , reservoir effective pemeability ,
skin factor and other reservoir paramelers.
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