Downhole optical fiber temperature and pressure testing instrument for oil and gas wells

Abstract

The invention discloses an oil and gas well downhole optical fiber temperature and pressure testing instrument, which includes an optical fiber, a transmission cable, a rope cap sequentially connected through a steel pipe, and two temperature and pressure testing devices. The temperature and pressure testing device is equipped with a carbon fiber elastic body, a carbon fiber elastic There are temperature-sensing elements and pressure-sensing elements on the body, the optical fiber is embedded in the upper end of the carbon fiber elastic body and connected with the temperature-sensing element and the pressure-sensing element, the transmission cable is embedded in the lower end of the carbon fiber elastic body, between the temperature and pressure testing device and the carbon fiber elastic body There are three sections of annular chambers, the ends of the annular chambers at both ends are provided with openings and filled with rubber inside, and the annular chamber in the middle section is a sealed chamber to form a pressure sensing chamber, the pressure sensing chamber communicates with the outside, and the pressure sensing element is in the inside the pressure sensing chamber. The invention can well solve the temperature and pressure test of high-temperature and high-pressure oil and gas wells, and at the same time, the reserved transmission cable can also be connected with traditional electrical logging instruments, so that more parameters can be measured.

Description

technical field [0001] The invention relates to the field of formation temperature and pressure testing of high-temperature and high-pressure wells, in particular to a downhole optical fiber temperature and pressure testing instrument for oil and gas wells. Background technique [0002] Temperature and pressure are two very important parameters in the development process of oil and gas wells. Their real-time and accuracy are of great significance to production prediction and reserve estimation in the process of oil and gas well development. As the drilling depth of oil and gas wells With the increase of oil and gas wells, the downhole temperature and pressure of oil and gas wells are constantly rising. At present, the widely used electronic pressure and temperature sensors have problems such as abnormal operation and temperature and pressure data drift in high temperature environments, which cannot meet the current testing requirements of high temperature and high pressure we...

AI Technical Summary

Problems solved by technology

[0002] Temperature and pressure are two very important parameters in the development process of oil and gas wells. Their real-time and accuracy are of great significance to production prediction and reserve estimation in the process of oil and gas well development. As the drilling depth of oil and gas wells The downhole temperature and pressure of oil and gas wells continue to rise. At present, electronic pressure and temperature sensors widely used in high temperature environments have problems such as abnormal operation and temperature and pressure data drift, which cannot meet the current testing requirements of high temperature and high pressure wells.

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