A power supply system for downhole instruments of wireless inclinometer while drilling

Abstract

The invention discloses a power supply system of a wireless drilling inclinometer underground instrument. The power supply system includes a direction-varying stator and a magnetic force rotor which are axially arranged, the magnetic force rotor is coupled with a magnetic force main shaft, the magnetic force main shaft is connected with a magnetic force flange, the magnetic force flange is axially opposite to a coil group but is not in contact with the coil group, the coil group is connected with a regulation circuit, and the regulation circuit is connected with an instrument power supply bus; the surface of the direction-varying stator is provided with an inclined blade, and the inclination angle is adjustable; the magnetic force flange and the coil group has a certain adjustable gap; and the regulation circuit contains a judgment circuit and a voltage stabilizing circuit, and electricity generated by the coil group is judged by the judgment circuit, and is output in a voltage range suitable for the instrument after voltage stabilization by the voltage stabilizing circuit. The power supply system of the wireless drilling inclinometer underground instrument can realize electricity generation output in a 10L / S to 70L / S mud displacement range.

Description

technical field [0001] The invention relates to an oil drilling inclinometer, in particular to a power supply system for a downhole instrument of a wireless inclinometer while drilling. Background technique [0002] A safe, reliable and stable power supply system is one of the necessary conditions to ensure the normal operation of the downhole instrument of the wireless inclinometer while drilling. For a long time, the mainstream series of wireless while-drilling inclinometers at home and abroad have been powered by the short section of lithium battery, and the short section of lithium battery is used for power supply. There are some outstanding problems that cannot be overcome: [0003] 1. The safety of lithium batteries cannot be guaranteed. As we all know, lithium batteries will explode under strong impact, overheating, short circuit, etc., and the power is quite huge: Generally, the energy of our mobile phone battery is 3Ah, and the destructive power of the explosion is ...

AI Technical Summary

Problems solved by technology

For a long time, the mainstream series of wireless while-drilling inclinometers at home and abroad have been powered by the short section of lithium battery, and the short section of lithium battery is used for power supply. There are some outstanding problems that cannot be overcome:

[0003] 1. The safety of lithium batteries cannot be guaranteed. As we all know, lithium batteries will explode under strong impact, overheating, short circuit, etc., and the power is quite huge: Generally, the energy of our mobile phone battery is 3Ah, and the destructive power of the explosion is already amazing. , and the lithium battery pack used in our instrument is 28Ah*8=224Ah, the power is dozens of times that of mobile phone batteries. In recent years, lithium battery explosions have also occurred in major oil fields, causing equipment damage or casualties;

[0004] 2. The extensive use of lithium batteries will cause serious pollution to the ecological environment, which is not conducive to environmental protection: lithium batteries are consumables. During the drilling process, a set of batteries will generally be used up in about 150 hours, and a 3,000-meter well is completed. Get four or five sets of batteries. According to incomplete statistics, the total number of instruments in major oil fields across the country is more than 6,000 sets. If each set of instruments completes 10 wells per year (relatively conservative), then the annual battery consumption is about 300,000 groups, most of the used lithium batteries are discarded by users or buried near the well site, and the electrolyte in the battery is a chemical, which will cause great damage to the environment;

[0005] 3. Unable to meet the requirements of high-temperature operations: With the increasing level of drilling, the drilling depth is getting deeper and deeper, and high-temperature wells above 175 °C are also emerging, and the safe use temperature of lithium batteries is generally lower than 150 °C, so it cannot Meet the use requirements;

[0006] 4. Affect the construction progress and increase the construction cost: Whenever a set of batteries is used up, the drill has to be replaced to replace the battery, which will inevitably affect the construction progress and increase the construction cost;

[0007] 5. Cause waste of resources and increase construction cost: Because the construction time of each well is different, it is impossible to use up the power of each battery. For example, a battery can be used for 150h, and it takes 120h to complete a well. The remaining 30h of power will not be used for a long time next time, and generally it will not be used, so this part of the power will be wasted

[0009] 1. Since the generator should be used inside the drill collar, and the inner diameter of the drill collar is very small (71mm in common use), this determines that the power of the generator in the traditional structure is too small, generally about 5W, which can only meet the inclinometer. The power supply of the instrument part, when connected to the geological parameter module such as gamma, the power is not enough;

[0010] 2. The adaptability is too narrow, and it can only be used under a certain range of mud displacement;

[0011] 3. Since the traditional structure cannot avoid the use of dynamic sealing mechanism, the service life of the dynamic sealing structure is very short in high temperature and high pressure mud, and it is very easy to fail. The generator often breaks down and cannot be widely used.

Images