Safe Techniques of the Perforation System for Oil and Gas Wells

Abstract

The perforation field all over the world has been puzzled by the difficultquestion that the perforating system goes off on the ground while doing oil and gas well perforating operation. Besides necessary safety education and strictlyoperating rules, regulations & procedures, the perforating operations should be guaranteed by systematic and necessary safety techniques. This paper analyzed the non-safe factors existed in the perforating operations in the aspect of the dangerous source, safety control and the reliability evaluation of the perforation system, and presented the corresponding countermeasure to each links. All these countermeasure and measurement have been tested and successfully applied for over ten thousand times in more than 4000 wells, goods results have been obtained. Introduction The cause that the perforating system explodes on the ground is complicated, but the detonator is the source of explosion. The general techniques and measurement is difficult to get the desired result. In order to prevent or decrease the surface explosion, Shengli Well Logging Company successfully made a set of pressure operated safe system for perforating operation through many year practices. The concrete method is as follows: Increasing the immunity of detonator to external interference by enabling the filament of detonator both in normal open status to the outside and in short status to the inside. The whole assembly is shielded inside metal housing. This detonator has the abilities to prevent against ESD, RF interference, induced current from stray voltage, human errors. Pressure operated anti-explosion device is built in between detonator and the secondary explosives (detonating cord and charges). Even if accidental firing of the detonator, the shock wave will be resisted by anti-explosion device, the secondary explosives will not be initiated. The safety of operating personnel will be therefore guaranteed.