A device and method for measuring fluid conductivity

A conductivity and fluid technology, applied in the direction of fluid resistance measurement, material resistance, etc., can solve problems affecting measurement accuracy, signal drift, etc., to achieve the effects of ensuring measurement accuracy, eliminating temperature drift, and reducing production costs
CN103412009BActive Publication Date: 2015-12-02CHINA NAT OFFSHORE OIL CORP +1
9 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2015-12-02

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a fluid conductivity sensor, and a device and a method for measuring fluid conductivity, and relates to the field of wireline logging. The method comprises the following steps: detecting voltage values of the two ends of a receiving resistor at different temperatures when no fluid passes to obtain multiple groups of first voltage values; inverting a relationship between induced voltages generated at the two ends of the receiving resistor by a transmitting coil and temperature variation according to the relationship between the multiple groups of first voltage values and temperature variation; detecting the voltage values of the two ends of the receiving resistor at different temperatures when fluid to be monitored passes to obtain multiple groups of second voltage values; calculating to obtain a relationship between the fluid conductivity and temperature variation according to the relationship between the induced voltages generated at the two ends of the receiving resistor by the transmitting coil and temperature variation and the multiple groups of second voltage values. Due to the design that a winding is connected in parallel with the fluid conductivity sensor and a matched circuit is provided, temperature compensation of the sensor is realized, and measuring accuracy of the coil type fluid conductivity sensor under a high-temperature environment is guaranteed.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of cable logging, in particular to a downhole fluid conductivity sensor and a method for measuring fluid conductivity. Background technique

[0002] When the cable formation tester pumps the formation fluid, it needs to monitor the conductivity of the fluid in real time, so as to judge the fluid characteristics and distinguish the formation fluid and the wellbore mud. Therefore, it is necessary to install a fluid conductivity sensor that can work in an underground high temperature environment.

[0003] The coil sensor has the characteristics of non-contact and maintenance-free, and is suitable for fluid conductivity detection. These sensors use a pair of mutual induction coils to measure fluid conductivity. In order to improve the sensitivity, a high permeability iron core coil is usually used. Under normal temperature environment, the accuracy and repeatability of this sensor are very good. However, the magnetic ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More