A multi-stage pressure coding detonation method and device for oil well perforation

Abstract

The invention relates to a method and device for multi-stage pressure coding detonation for oil well perforation. The pressure and temperature signals of the perforation layer of oil and gas wells are detected in real time by pressure sensors and temperature sensors, and the temperature signals are compared with the temperature set by the temperature switch. Comparison, after reaching or exceeding the temperature set by the degree switch, start the identification of the detonation signal; compare the received pressure signal with the pre-stored start-up pressure command to complete the start-up pressure command recognition; compare the subsequent received pressure signal with the pre-stored set Compared with the predetermined pressure coding command, the received pressure signal is compared with the preset positive coding command and negative coding command. The positive work command controls the work circuit to output positive polarity voltage, detonates the perforating charge, and realizes the detonation of the first-level perforating gun. The same principle can realize negative detonation perforation.

Description

technical field [0001] The invention belongs to the automatic control technology in the field of petroleum, and relates to a multi-stage pressure coding detonation method and device for oil well perforation. Background technique [0002] In the field of petroleum, as an important natural resource, petroleum occupies a pivotal position in the process of my country's economic and social development. Since the reform and opening up, with the rapid development of my country's economic construction, the dependence on natural resources, especially oil, has become increasingly apparent. my country is a country that lacks oil, and more than half of its demand needs to be imported every year. Correspondingly, the development of petroleum instruments in our country is also at a relatively backward level in the world. Increase the development of advanced petroleum instruments and improve To improve oil production efficiency and obtain higher output is a very urgent problem facing our c...

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Problems solved by technology

This method also cannot be used in the construction of highly deviated wells and horizontal wells, nor can it be used in perforation processes such as test joints and perforation with pumps.

[0013] The detonation method of mode 3 is applicable to almost all well conditions, so it is the most widely used method. However, after the delay initiator is lowered into the well, the delay time of detonation cannot be changed due to the fixed delay time; When there is a delay condition, it is necessary to increase the number of delay detonators, which increases the equipment volume, complexity and cost; it is impossible to realize the monitoring of the downhole working environment (parameters such as working pressure and ambient temperature)

[0014] In addition, in the ignition process of the above methods, a single pressure value is used to stimulate the detonation. Due to the variability of the downhole environment and the pressure detection method is too simple, the pressure detection is inaccurate, prone to false detonation, resulting in engineering accidents, construction delays and property damage. loss

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