Method and tool for logging-while-drilling
First Claim
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1. A logging-while-drilling tool for use in an earth drilling apparatus comprising:
- a drill string having a drill bit at the lower end thereof, said drill string receiving flow of drilling fluid which flows through said drill bit,a housing positioned in said drill string and above said drill bit such that drilling fluid which is circulated through the drill string will flow around the housing;
a shaft journaled in the housing;
means mounted on said shaft outside of said housing and including a rotating element and said means having a pressure response characteristic related to the rotational speed of said rotating element for generating pressure pulses in response to changes in the rotational speed of said rotating element while said drilling fluid continuously flows therethrough;
said rotating element being continuously and rotatingly driven solely by drilling fluid flowing through said drill string and having a predetermined pressure response characteristic in response to continuous flow therethrough; and
means for changing the rotational speed of said rotating element in order to change the pressure response thereof while said drilling fluid flows therethrough and thereby to generate a pressure pulse which is transmitted through said drilling fluid.
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Abstract
A logging-while-drilling tool includes a housing positioned in a drill string, a shaft journaled in the housing, a turbine stage or stages, a rotor or rotors, the latter mounted on the shaft outside of the housing and driven by the drilling fluid and a braking device for variably controlling the rotational speed of the rotor in order to produce pressure pulses which are transmitted to the surface through the drilling fluid. A generator or other energy storing device is provided to power an electronic package which interprets downhole conditions for transmission of the same as pressure pulses.
70 Citations
8 Claims
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1. A logging-while-drilling tool for use in an earth drilling apparatus comprising:
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a drill string having a drill bit at the lower end thereof, said drill string receiving flow of drilling fluid which flows through said drill bit, a housing positioned in said drill string and above said drill bit such that drilling fluid which is circulated through the drill string will flow around the housing; a shaft journaled in the housing; means mounted on said shaft outside of said housing and including a rotating element and said means having a pressure response characteristic related to the rotational speed of said rotating element for generating pressure pulses in response to changes in the rotational speed of said rotating element while said drilling fluid continuously flows therethrough; said rotating element being continuously and rotatingly driven solely by drilling fluid flowing through said drill string and having a predetermined pressure response characteristic in response to continuous flow therethrough; and means for changing the rotational speed of said rotating element in order to change the pressure response thereof while said drilling fluid flows therethrough and thereby to generate a pressure pulse which is transmitted through said drilling fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification