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Downhole pressure and/or temperature gauges

  • US 4,805,448 A
  • Filed: 08/18/1987
  • Issued: 02/21/1989
  • Est. Priority Date: 08/20/1986
  • Status: Expired due to Fees
First Claim
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1. In an assembly for continuously monitoring down-hole pressure or temperature parameters in an oil or gas well or other remote location accessible only along a narrow passageway,means defining a sensing element having a longitudinal axis and two further axes each orthogonal to the longitudinal axis, the sensing element being subject to angular deflection about the longitudinal axis over a limited range in response to any change in the parameter being measured and motion in the direction of the longitudinal axis of the sensing element,means for recording on a continuous basis the said changes in the parameter sensed by the sensing element and converted to said angular deflection,elongate means coupling the sensing element and the continuous recording means,means supporting the elongate means at spaced locations along the length of the elongate means, the supporting means includingan elongate housing, anda compliant device interposed along the length of the elongate coupling means, said compliant device exhibiting torsional rigidity such that the angular deflection of the sensing element is transmitted with high precision to the recording means while any motion of the sensing element in the direction of said longitudinal axis is accommodated by the compliant device substantially without transmission of the motion of the sensing element in the direction of the longitudinal axis of the sensing element.

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