Patent ID: 6367323
Filing Date: 2002-04-09
Classification: E21B

Abstract:
A drill string section for use in making up a drill string for oil and gas drilling, said drill string section carrying instrumentation for Measurement While Drilling and Logging While Drilling operations, said instrumentation including a Dynamic Pressure Device for measuring drill string bore pressure of incoming pressurized fluid and drill string annular pressure of returned pressurized fluid, said instrumentation being retrievable from said drill string when said drill string section is stuck or otherwise abandoned downhole, said drill string section comprising:i) a length of drill string pipe having a bore defined by an inner surface of a pipe wall which has an outer surface, ii) a cylindrical landing sleeve and a support for centering said sleeve in said pipe bore, iii) communicating ports extending through said drill pipe wall from said outer pipe surface to said inner surface and through said support to an inside surface of said landing sleeve, iv) said instrumentation being provided in an elongate cylindrical tool shell, spaced apart seals which engage said inside surface of said landing sleeve and the outer surface of said tool shell, means for locating said communicating ports between said spaced-apart seals, v) said instrumentation in said tool shell having a first terminated passageway in said tool shell between said seals which communicates with a pressure sensor within said shell to sense thereby said drill string annular pressure, vi) said instrumentation having a second terminated passageway in said tool shell in communication with said drill string bore and in communication with a pressure sensor within said shell whereby said drill string bore pressure is sensed.