Well logging method & apparatus
AssigneeReeves Wireline Technologies Limited
InventorsAlex Watson Milne, Michael Charles Spencer
Life of this patent
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Abstract
A method of well logging in which the logging tool is delivered to the bottom of the well within a drill pipe and then the well is logged by withdrawing the drill pipe with the sensor portion of the logging tool protruding from the drill pipe. Following the logging operation the logging tool is returned to the surface by reverse circulation.
Claims5
A method of well logging comprising the steps of:
- a) inserting a battery powered memory logging device into a well borehole at a head end of said well. said well borehole containing a drill pipe,
- b) forcing said logging device to a position adjacent to the far end of said drill pipe, opposite to said head end, by means of pump pressure applied to said logging device, said pump pressure being applied along said drill pipe from said head end,
- c) maintaining pump pressure on said logging device,
- d) pulling back on said drill pipe over a defined length whilst maintaining said pump pressure to force at least a portion of the logging tool containing logging sensors into the open borehole at the end of the drill pipe,
- e) pulling said drill pipe through said borehole towards said head end,
- f) maintaining the pump pressure to maintain the position of the logging portion of the logging device protruding from the end of the drill pipe,
- g) logging the characteristics of the well with said logging device as said drill pipe is pulled through said well borehole.
A well logging tool for use with the above method, said well logging tool comprising a first portion comprising well logging sensors and a second portion comprising a retention portion, said retention portion being provided with collar means for retaining said logging device within said drill pipe.
Dependencies are inferred from the claim text.