Multi-mode testing tool and method of testing
First Claim
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1. A tool for use in a testing string disposed in a well bore, comprising:
- tubular housing means defining a longitudinal tool bore;
valve menas including a tool bore closure valve disposed in said housing means;
operating means, including mandrel means, adapted to selectively open and close said tool bore closure valve in response to sequential changes in pressure proximate said tool in said well bore; and
ratchet means associated with said mandrel operating means or controlling said selective opening and closure of said tool bore closure means pursuant to a program.
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Abstract
A multi-mode testing tool operable as a drill pipe tester, formation tester, nitrogen displacement valve or circulation valve. Tool mode is changed responsive to pressure cycling in the well bore. A ball valve in the tool bore may also be operated by pressure cycling when the tool is in its formation tester mode. Also disclosed is a pressure responsive double-acting piston power mechanism, and a ball and slot ratchet assembly.
110 Citations
9 Claims
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1. A tool for use in a testing string disposed in a well bore, comprising:
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tubular housing means defining a longitudinal tool bore; valve menas including a tool bore closure valve disposed in said housing means; operating means, including mandrel means, adapted to selectively open and close said tool bore closure valve in response to sequential changes in pressure proximate said tool in said well bore; and ratchet means associated with said mandrel operating means or controlling said selective opening and closure of said tool bore closure means pursuant to a program. - View Dependent Claims (2, 3, 4)
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5. A testing tool for use in a well bore, comprising:
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tubular housing means defining a longitudinal tool bore; mandrel means slidable disposed in said tool bore; a tool bore closure valve adapted to block said tool bore respective to longitudinal movement of said mandrel means; and operating means adapted to effect said longitudinal mandrel means movement in response to pressure changes in said well bore, said operating means further including lost motion means to selectively disconnect said tool bore closure valve from and reconnect said tool bore closure valve to said mandrel means. - View Dependent Claims (6, 7, 8)
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9. A method of operating a testing tool having a longitudinal bore therethrough, comprising:
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running said tool into a well bore on a pipe string; opening a tool bore closure valve disposed in said tool bore responsive to an increase in pressure in said well bore; reducting said well bore pressure without closing said tool bore closure valve; increasing said well bore pressure a second time; reducing said well bore pressure a second time; and closing said tool bore closure valve in response to said second reduction in well bore pressure.
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Specification