System for continuously monitoring temperature and pressure during steam injection and soaking process

Abstract

The invention discloses a system for continuously monitoring temperature and pressure during steam injection and soaking process. The system comprises an armoured cable (1), a pressure and temperature sensor (2), a ground data processor (5) and a ground controller (6). The armoured cable (1) comprises a pair of capillaries (3 and 4), namely a temperature measuring capillary (3) and a pressure measuring capillary (4). Both the two capillaries are filled with a high-temperature pressure conductive medium. Both the aboveground end parts of the two capillaries are connected with the ground data processor (5). Both the underground end parts of the two capillaries are exposed outside the armoured cable (1). Underground pressure is conducted to the pressure measuring capillary (4) through a clean pipe at the underground end part of the pressure measuring capillary (4). The underground end part of the temperature measuring capillary (3) is communicated with the pressure and temperature sensor(2). The ground data processor (5) is used for amplifying and conditioning two pressure signals transmitted by the pressure measuring capillary (4) and the temperature measuring capillary (3) and sending to the ground controller (6) so as to correct the two pressure signals into pressure and temperature engineering values of an underground oil layer.

Description

technical field

[0001] The invention relates to a temperature and pressure continuous monitoring system, in particular to a system for continuously monitoring the temperature and pressure of an oil layer section in the braising link during the heavy oil steam injection exploitation process in an oil field. Background technique

[0002] In the process of steam injection production of heavy oil, braising well is an important production link, and its length of time varies with regions. Generally more than five days, some as long as several months. In order to understand the downhole performance in a timely manner, it is usually necessary to detect the changes in temperature and pressure in order to obtain the best production time and improve the steam injection production efficiency.

[0003] During the brine period, the temperature in the well is generally above 250°C, and the conventional well logging and testing instruments are not competent. One of the schemes that is eas...

Examples

Embodiment 1

[0027] Figure 1a It is a schematic diagram of the system structure of "Embodiment 1" of the present invention. This system is driven downhole by the power of the lower pipe string, and it can be used for permanent monitoring in vertical wells. from Figure 1a It can be seen from the figure that the armored cable 1 containing a pair of capillary tubes is fixed on the downhole string, and goes down to the measurement well section along with the string 9, and the capillary tube is directly connected to the ground data converter 5. The downhole pressure is introduced into the capillary 4 filled with high-temperature pressure-guiding medium through the clean pipe, and the pressure at the measured place is transmitted to the surface data processor 5 through the pressure-guiding medium. The pressure temperature sensor 2 is a constant-volume container filled with a high-temperature pressure-guiding medium. There is a linear relationship between the temperature and pressure of the hig...

Embodiment 2

[0030] figure 2 It is a schematic diagram of the system structure of "Embodiment 2" of the present invention. This system is based on the action of winch power and gravity, and it can be used in vertical wells for permanent or temporary monitoring. Its characteristic is that it is easy to move. from figure 2It can be seen from the figure that the armored cable 1 containing a pair of capillary tubes is coiled on the logging drawworks 9, the pressure temperature sensor 2 and the measuring capillary tubes 3 and 4 are lowered to the measuring well section by the power of the winch and gravity, and the capillary tubes are directly connected to the ground data converter 5 on. The downhole pressure is introduced into the capillary 4 filled with high-temperature pressure-guiding medium through the clean pipe, and the pressure at the measured place is transmitted to the surface data processor 5 through the pressure-guiding medium. The pressure temperature sensor 2 is a constant-v...

Embodiment 3

[0032] The temperature and pressure continuous monitoring system of the present invention can also lower a group or groups of capillary armored cables to the measurement well section of the horizontal well by means of the power of the flexible tubing, and it can be used for permanent monitoring of the horizontal well SAGD.

technical field

[0001] The invention relates to a temperature and pressure continuous monitoring system, in particular to a system for continuously monitoring the temperature and pressure of an oil layer section in the braising link during the heavy oil steam injection exploitation process in an oil field. Background technique

[0002] In the process of steam injection production of heavy oil, braising well is an important production link, and its length of time varies with regions. Generally more than five days, some as long as several months. In order to understand the downhole performance in a timely manner, it is usually necessary to detect the changes in temperature and pressure in order to obtain the best production time and improve the steam injection production efficiency.

[0003] During the brine period, the temperature in the well is generally above 250°C, and the conventional well logging and testing instruments are not competent. One of the schemes that is eas...

Examples

Embodiment 1

[0027] Figure 1a It is a schematic diagram of the system structure of "Embodiment 1" of the present invention. This system is driven downhole by the power of the lower pipe string, and it can be used for permanent monitoring in vertical wells. from Figure 1a It can be seen from the figure that the armored cable 1 containing a pair of capillary tubes is fixed on the downhole string, and goes down to the measurement well section along with the string 9, and the capillary tube is directly connected to the ground data converter 5. The downhole pressure is introduced into the capillary 4 filled with high-temperature pressure-guiding medium through the clean pipe, and the pressure at the measured place is transmitted to the surface data processor 5 through the pressure-guiding medium. The pressure temperature sensor 2 is a constant-volume container filled with a high-temperature pressure-guiding medium. There is a linear relationship between the temperature and pressure of the hig...

Embodiment 2

[0030] figure 2 It is a schematic diagram of the system structure of "Embodiment 2" of the present invention. This system is based on the action of winch power and gravity, and it can be used in vertical wells for permanent or temporary monitoring. Its characteristic is that it is easy to move. from figure 2It can be seen from the figure that the armored cable 1 containing a pair of capillary tubes is coiled on the logging drawworks 9, the pressure temperature sensor 2 and the measuring capillary tubes 3 and 4 are lowered to the measuring well section by the power of the winch and gravity, and the capillary tubes are directly connected to the ground data converter 5 on. The downhole pressure is introduced into the capillary 4 filled with high-temperature pressure-guiding medium through the clean pipe, and the pressure at the measured place is transmitted to the surface data processor 5 through the pressure-guiding medium. The pressure temperature sensor 2 is a constant-v...

Embodiment 3

[0032] The temperature and pressure continuous monitoring system of the present invention can also lower a group or groups of capillary armored cables to the measurement well section of the horizontal well by means of the power of the flexible tubing, and it can be used for permanent monitoring of the horizontal well SAGD.

Images