阅读说明：本技术 一种井下石油煤炭直流电点火方法 (Direct current ignition method for underground petroleum coal ) 是由 邓惠荣 于 2021-01-15 设计创作，主要内容包括：本发明公开了一种井下石油煤炭直流电点火方法,直流电供电装置为电热装置供电,直流电供电装置和电热装置由连续管输送至油层的油井射孔的点火部位；启动可充电直流电池后,电热装置开始放热,加热油层,使油层的温度快速上升至200℃以上；油层经过预热后建立了可燃烧或氧化裂解温度场,此时再注入空气,使油层的有机物质开始氧化裂解,释放热量,进一步提高油层的温度；待近井地带的压力稳定后,向油层中持续大量注入空气,使空气中的氧气与原油持续发生氧化裂解反应,持续释放热量,实现油层稳定裂解,实现点火目的。本发明将为空气驱地下油层点火、煤炭地下气化引燃点火的技术进步及大规模工业化应用提供了科学合理的经济的技术条件。(The invention discloses a direct current ignition method for underground petroleum and coal, wherein a direct current power supply device supplies power to an electric heating device, and the direct current power supply device and the electric heating device are conveyed to an ignition part of an oil well perforation of an oil layer by a continuous pipe; after the rechargeable direct current battery is started, the electric heating device starts to release heat to heat the oil layer, so that the temperature of the oil layer is quickly increased to more than 200 ℃; after the oil layer is preheated, a combustible or oxidative cracking temperature field is established, and air is injected at the moment, so that organic substances in the oil layer start oxidative cracking, heat is released, and the temperature of the oil layer is further increased; after the pressure of the near wellbore zone is stable, a large amount of air is continuously injected into the oil layer, so that the oxygen in the air and the crude oil are continuously subjected to oxidative cracking reaction, heat is continuously released, the oil layer is stably cracked, and the ignition purpose is realized. The invention provides scientific, reasonable and economic technical conditions for technical progress of air-driven underground oil layer ignition, underground coal gasification ignition and large-scale industrial application.)

1. A direct current ignition method for underground petroleum coal is characterized by comprising the following specific processes:

firstly, connecting a plurality of chargeable direct current batteries in series to form a direct current power supply device and installing the direct current power supply device on the front section of a continuous tube, wherein the front section of the continuous tube is also provided with an electric heating device, the direct current power supply device supplies power for the electric heating device, and the continuous tube is used as a current loop;

the direct current power supply device and the electric heating device are conveyed to an ignition part of an oil well perforation of an oil layer by a continuous pipe; after the direct current power supply device is started, the electric heating device starts to release heat to heat the oil layer, so that the temperature of the oil layer is quickly increased to be more than 200 ℃;

after the oil layer is preheated, a combustible or oxidative cracking temperature field is established, and air is injected at the moment, so that organic substances in the oil layer start oxidative cracking, heat is released, and the temperature of the oil layer is further increased;

after the pressure of the near wellbore zone is stable, a large amount of air is continuously injected into the oil layer, so that the oxygen in the air and the crude oil are continuously subjected to oxidative cracking reaction, heat is continuously released, the oil layer is stably cracked, and the ignition purpose is realized.

2. The direct current ignition method for underground petroleum and coal as claimed in claim 1, wherein the direct current power supply device is electrically connected with the underground cable, the upper end of the underground cable is electrically connected with the ground power storage cabinet, and the ground power storage cabinet charges the direct current power supply device through the underground cable.

3. The method of claim 1, wherein the single rechargeable dc battery has a power of 25V.

4. The direct current downhole petroleum coal ignition method according to claim 1, wherein the electric heating device is an electromagnetic heating device.

Technical Field

The invention relates to the technical field of underground ignition, in particular to a direct current ignition method for underground petroleum and coal.

Background

At present, in the process of stratum development of petroleum and coal, ignition methods for a coal-bed oil layer mainly comprise steam injection ignition, alternating current electric thermocouple ignition and chemical ignition of the oil layer. The steam ignition process is complicated, the number of equipment is large, the occupied area is large, and the corrosion to a gas injection well sleeve and a gas injection pipe column is large; the success rate of alternating current electric thermocouple ignition and chemical ignition is low, the cable connection technology is immature, the matching is complicated, the operation is complex, and the cost is high.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a direct current ignition method for underground petroleum and coal.

In order to achieve the purpose, the invention adopts the following technical scheme:

a direct current ignition method for underground petroleum coal comprises the following specific processes:

firstly, connecting a plurality of chargeable direct current batteries in series to form a direct current power supply device and installing the direct current power supply device on the front section of a continuous tube, wherein the front section of the continuous tube is also provided with an electric heating device, the direct current power supply device supplies power for the electric heating device, and the continuous tube is used as a current loop;

the direct current power supply device and the electric heating device are conveyed to an ignition part of an oil well perforation of an oil layer by a continuous pipe; after the direct current power supply device is started, the electric heating device starts to release heat to heat the oil layer, so that the temperature of the oil layer is quickly increased to be more than 200 ℃;

after the oil layer is preheated, a combustible or oxidative cracking temperature field is established, and air is injected at the moment, so that organic substances in the oil layer start oxidative cracking, heat is released, and the temperature of the oil layer is further increased;

after the pressure of the near wellbore zone is stable, a large amount of air is continuously injected into the oil layer, so that the oxygen in the air and the crude oil are continuously subjected to oxidative cracking reaction, heat is continuously released, the oil layer is stably cracked, and the ignition purpose is realized.

Further, the direct current power supply device is electrically connected with the underground cable, the upper end of the underground cable is electrically connected with the ground large-scale electricity storage cabinet, and the ground large-scale electricity storage cabinet continuously charges the direct current power supply device through the underground cable.

Further, the power of the single rechargeable direct current battery is 25V.

Further, the electric heating device is an electromagnetic heating device.

The invention has the beneficial effects that: the invention uses the chargeable direct current battery as the power supply device, can be repeatedly charged, can be repeatedly used, has simple, convenient and safe operation, low operation cost and easy popularization, and provides scientific, reasonable and economic technical conditions for the technical progress of air-driven underground oil layer ignition and coal underground gasification ignition and large-scale industrial application.

Drawings

FIG. 1 is a schematic diagram of the method of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.

The embodiment provides a direct current ignition method for underground petroleum coal, which comprises the following specific processes as shown in fig. 1:

firstly, connecting 50 chargeable direct current batteries in series to form a direct current power supply device 1 and installing the direct current power supply device 1 on the front section of a continuous tube 2, wherein an electric heating device 4 is also installed on the front section of the continuous tube 2, the direct current power supply device 1 supplies power to the electric heating device 4, and the continuous tube 2 is used as a current loop;

the direct current power supply device 1 and the electric heating device 4 are conveyed to an ignition part of an oil well perforation 5 of an oil layer 3 by the continuous pipe 2; after the direct current power supply device 1 is started, the electric heating device 4 starts to release heat to heat the oil layer 3, so that the temperature of the oil layer 3 is rapidly increased to 220 ℃;

after the oil layer 3 is preheated, a combustible or oxidative cracking temperature field 6 is established, and air 7 is injected at the moment, so that organic substances in the oil layer 3 start oxidative cracking, heat is released, and the temperature of the oil layer 3 is further increased to 350 ℃;

after the pressure 8 of the near wellbore area is stable, a large amount of air 7 is continuously injected into the oil layer 3, so that oxygen in the air and crude oil are continuously subjected to oxidative cracking reaction, heat is continuously released, the oil layer is stably cracked, and the ignition purpose is realized.

In this embodiment, the dc power supply device 1 is electrically connected to the downhole cable, the upper end of the downhole cable is electrically connected to the large-scale ground power storage cabinet, and the large-scale ground power storage cabinet charges the dc power supply device 1 through the downhole cable. In this embodiment, the downhole cable is wrapped in coiled tubing 2 and directly connected to the dc power supply 1.

In the present embodiment, the dc power supply 1 is 50 meters long, and the power of the single rechargeable dc battery is 25V.

In the present embodiment, the electric heating device 4 is an electromagnetic heating device.

Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.