Well logging densimeter

A measuring tube and detector technology, applied in the field of measuring instruments, can solve the problems of difficult maintenance, inaccurate measurement, inconvenient use, etc., and achieve the effect of solving difficult maintenance, good repeatability and linearity, and solving inconvenience in use

Active Publication Date: 2012-11-28
江苏科力博奥仪表有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The existing logging technology and patents have problems such

Method used

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Embodiment 1

[0024] In order to ensure that the primary table can work normally in the harsh environment of the underground, the measuring tube 4 must be cold-formed with a seamless tube, and intermittent welding is not allowed in the middle, and it must be ensured that the measuring tube 4 cannot be bent, welded, etc. during the assembly process. Damaged during processing. The assembly and welding of the primary meter should ensure small deformation, ensure that the measuring tube can vibrate freely under normal environment and high temperature and high pressure, and can not scratch any fixed parts.

[0025] In order to ensure that the secondary meter can work normally in the harsh environment of the underground, all electronic components are selected from the highest temperature grade devices, and have been energized and aged at a temperature of 150°C.

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Abstract

The invention discloses a well logging densimeter, which belongs to a measuring instrument and is applied to well logging in oil drilling. The well logging densimeter comprises a primary meter and a secondary meter, wherein the primary meter comprises an approximately long elliptical measuring tube 4 formed by bending, a high-pressure joint 1, an end plate 2, a vibration isolation plate 3, two detectors 5, an auxiliary vibrating plate 7, a vibration exciter 8, a platinum resistance temperature sensor 9, a circular shell, a cable plug 6 and the like; the secondary meter is used for providing a vibration exciting signal for the vibration exciter 8, so that the measuring tube 4 generates self-oscillation; a measured liquid flows inwards from one end 1 of the measuring tube, and flow out of the other end of the measuring tube; the secondary meter is used for amplifying, filtering and reshaping a signal output by the detectors 5, and converting a phase difference and a period into a digital quantity; a microcontroller is used for calculating and compensating temperature according to measured phase difference, period and temperature to obtain mass flow, density and temperature; and an output circuit is used for converting the mass flow, density and temperature into pulse of 1-10kHz for outputting.

Description

technical field [0001] The invention belongs to a measuring instrument, in particular to a special well logging instrument used for measuring the density of downhole liquid in oil drilling, and at the same time measuring mass flow and temperature, etc. Background technique [0002] Due to the special working conditions of oil drilling, the logging instrument is required to be small in size (the diameter cannot be larger than the drilling pipe), the environmental conditions are harsh (temperature 150°C, pressure 160Mpa), and the measurement accuracy is required to be high. Most of the existing patents and currently used logging density instruments use the rays of the radioactive source to penetrate the measured medium and calculate through detector detection. There are also some patents that use other methods. Such as: [0003] 1. High temperature density logging instrument, patent application number: 200720022988.7. Its technical scheme is composed of radiation shielding ...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B47/07E21B49/08
Inventor 不公告发明人
Owner 江苏科力博奥仪表有限公司
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