A downhole laser perforating device for transporting laser light by a umbilical cable

Abstract

The invention relates to an underground perforating device, in particular to an underground laser perforating device for transporting laser light by a umbilical cable. It is composed of a central tube, an upper joint, a lower joint, a pipe joint, a focuser and a support sleeve. A focuser is installed in the center tube through an inner boss. One end of the focuser is equipped with a pipe joint. Contact connection; the other end of the focuser is equipped with a support sleeve, and a reflector is installed in the support sleeve. The downhole laser perforation device uses high-energy laser rays to carry out perforation operations, which can effectively avoid the casing rupture and leakage at the perforation caused by traditional perforation, and the rock around the perforation will block the perforation due to rupture. At the same time, the thermal effect of the laser can be Improve the oil and gas penetration efficiency of rock formations and improve oil recovery. It solves the problems of low working reliability of existing perforating bullets, unexploded phenomenon often occurs during construction, fixed perforation distribution, and cannot be adjusted flexibly, and is especially suitable for perforating operations.

Description

technical field [0001] The invention relates to an underground perforating device, in particular to an underground laser perforating device for transporting laser light by a umbilical cable. Background technique [0002] As the main link of well completion technology, perforation technology has a direct relationship with oil and gas well productivity. At present, the delivery methods of perforation technology are mainly divided into: cable delivery perforation, string delivery perforation, flexible pipe delivery perforation. The perforators are classified into: conventional perforators, ultra-deep penetration perforators, large-aperture perforators, high-density perforators (20 holes / m), sand control perforators, and composite perforators. The ultimate goal of perforation is to establish a reliable and effective channel between the oil and gas production layer and the wellbore, so as to improve the oil and gas production effect. Perforation is a downhole operation that use...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, perforating gun bullet hole technology requires strict management of explosives, low reliability of perforating bullets, unexploded phenomenon often occurs during construction, fixed perforation distribution cannot be flexibly adjusted, and only circular holes can be formed. The mechanical impact during the working process is relatively large, which will cause great damage to the pipe string and cementing, and a series of problems such as the low reuse rate of the perforating gun body, and cannot effectively solve the current perforation parameter problems, such as penetration depth and hole diameter.

Images