Multistep pressure coding detonating method and device for well perforation

Abstract

The invention relates to a multistep pressure coding detonating method and device for well perforation. The method comprises the following steps: detecting pressure and temperature signals of a position of well perforation through a pressure sensor and a temperature sensor in real time, comparing the temperature signal with a temperature set by a temperature switch, and starting detonating signal identification after the temperature signal reaches or exceeds the temperature set by the temperature switch; comparing the received pressure signal with a pre-stored and set starting pressure command and completing starting pressure command identification; comparing a subsequently received pressure signal with a pre-stored and set pressure coding command, comparing the received pressure signal with a preset positive coding command and a preset negative coding command, and when a pressure signal detected underground conforms to the set positive coding command, sending a positive acting command to an acting circuit and controlling the acting circuit to output a positive-polarity voltage to detonate a perforating bullet, thereby realizing primary perforating gun detonation; by means of the same principle, negative detonating perforation can be realized.

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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