An underground pressure and temperature measurement cable

Abstract

The invention discloses an underground pressure-and-temperature-measurement cable. Temperature sensors for measuring different underground depth sections are distributed in a cable body; a pressure transmitter is also arranged at the bottom of the cable body, and the temperature sensors and the pressure transmitter are electrically connected with a measuring and controlling meter on a well through all wires penetrating through the cable body. The underground pressure-and-temperature-measurement cable is simple in structure and easy and convenient to install, signal interference between all temperature signals and signal interference between temperature signals and pressure signals can be effectively avoided, and the measuring accuracy of all the sensors is greatly increased; site managing and controlling are not required, time and labor are saved, and unattended operation is achieved.

Description

technical field [0001] The invention relates to the technical field of oil production in oilfields, in particular to a downhole pressure and temperature measurement cable. Background technique [0002] During the development of oilfields, managers need to keep abreast of the production status and dynamics of oil and water, including formation pressure in the downhole or temperature at different depths in the downhole. Only by mastering these production parameters can the working system of the production well be adjusted in a timely and reasonable manner, thereby To achieve scientific management and effective development. The formation pressure and temperature of oil wells are dynamic data that change with production. Mine personnel need to regularly go to the well to test, monitor various downhole parameters in real time and control the oil well at the same time, that is, measure downhole temperature and pressure in real time through downhole sensors. And other data, and th...

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Problems solved by technology

[0003] At present, the downhole temperature and pressure testing technologies commonly used in oil fields are mainly thermocouple and optical fiber testing technologies for downhole temperature dynamic monitoring, capillary tube testing technology for downhole pressure dynamic monitoring, and electronic pressure gauge testing technology for downhole single point pressure and temperature dynamic monitoring. And it cannot realize long-term dynamic monitoring of multi-point temperature under high temperature conditions. By combining thermocouple bundles, cables and downhole temperature and pressure testers to make a downhole pressure and multi-point temperature combined testing device, it is lowered into oil wells to obtain downhole single point pressure. and multi-point temperature test data, but there is no corresponding special cable for data transmission, resulting in complex structure, difficult underground installation, time-consuming and laborious; in addition, the use of thermocouple cables requires cold junction compensation, and ordinary copper wires cannot be used with them When integrated in a dedicated cable, it is susceptible to mutual signal interference, resulting in low measurement accuracy and making the structure of the dedicated cable more complicated

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