Method for preventing underground burning and explosion in non-reservoir air drilling

Abstract

The invention relates to a method for preventing underground burning and explosion in non-reservoir air drilling. The method comprises the following steps that pressure, temperature, flow, humidity and oxygen concentration sensors are mounted on a gas injection pipeline; pressure, temperature and humidity sensors are arranged inside and outside the 2 / 3 part of the whole length of a sand discharging pipeline; a gas sampling pipeline is connected to the position about 2 / 3 of the whole length of the sand discharging pipeline; gas enters a gas monitoring pipe section after being subjected to dust removal, dehydration and drying treatment, and the monitoring pipe section is provided with an oxygen concentration sensor, a carbon monoxide concentration sensor, a carbon dioxide concentration sensor, a nitrogen oxide concentration sensor, a hydrogen sulfide concentration sensor, a methane concentration sensor, a formaldehyde concentration sensor and an acetaldehyde concentration sensor; the monitoring pipe section is connected with an infrared total hydrocarbon component sensor and a gas chromatograph; and identification while drilling of the oil-gas-containing stratum, identification of the underground burning and explosion state or dynamic decision and implementation of underground burning and explosion control are carried out. By means of the method, underground burning and explosion possibly occurring when air drilling encounters a micro oil-gas-containing stratum can be effectively prevented, and safe, rapid and low-cost drilling of a non-reservoir stratum is achieved.

Description

technical field [0001] The invention relates to a method for preventing downhole explosion in non-reservoir air drilling in the drilling process of exploration and exploitation of oil and natural gas. Background technique [0002] In the drilling process of exploration and exploitation of oil and natural gas, air drilling is commonly used to increase the drilling speed, shorten the drilling time and reduce the drilling cost in large sections of non-reservoir drilling. This application is called "non-reservoir speed-up air drilling" . In large non-reservoir formations, there are generally formations containing trace amounts of oil and gas that have no value for exploitation due to low production. When air drilling encounters these slightly oil-gas formations, the oxygen in the downhole air mixes with the oil and gas produced in the formations, which may cause downhole combustion or explosion, resulting in damage or scrapping of drilling tools and even wellbore. The current ...

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Problems solved by technology

Compared with air drilling, due to the limitation of oxygen removal efficiency of membrane separation nitrogen production equipment, the equipment scale of nitrogen drilling is more than doubled, so the equipment rental fee, fuel consumption, lubricating oil consumption, manual operation cost and equipment area , are more than doubled, which greatly increases the cost of drilling

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