Optical fiber logging device for layered completion of horizontal well and well descending method

Abstract

The invention discloses an optical fiber logging device for layered completion of a horizontal well and a well descending method. The device comprises a safety valve, a first oil pipe, an optical cable branching supporting cylinder, a punching pipe, a second oil pipe, a locating assembly, an electric submersible pump and a packer capable of penetrating through, wherein the safety valve, the first oil pipe, the optical cable branching supporting cylinder, the punching pipe, the second oil pipe and the locating assembly are sequentially connected from top to bottom; the optical fiber logging device further comprises an optical cable and a well tool assembly connected to the lower end of the optical cable; the well tool assembly is fixed in the locating assembly; the lower portion of the optical cable is contained in the punching pipe and the second oil pipe; and the upper portion of the optical cable penetrates out of the branching end of the optical cable branching supporting cylinder and upwards penetrates through the packer capable of penetrating through along the outer portion of the pipe wall of the first oil pipe till the upper portion of the optical cable upwards penetrates out of a well mouth to be connected with monitoring equipment on the ground. According to the optical fiber logging device for layered completion of the horizontal well and the well descending method, a stable completion pipe string structure is combined with an optical fiber, and long-term and stable monitoring can be conducted on layered completion of the horizontal well.

Description

technical field [0001] The invention relates to the technical field of petroleum logging, in particular to a logging device using distributed optical fiber monitoring technology for logging in horizontal layer layered well completion and a permanent optical cable downhole method for well completion under special well conditions. Background technique [0002] Oil wells are divided into vertical wells, inclined wells and horizontal wells. Horizontal wells have long intervals and high oil production efficiency. [0003] my country's energy reserves started late and have a poor foundation. There is still a big gap between China and Western and other developed countries in the construction and research of oil and gas fields. Combined with the low permeability characteristics of my country's oil reservoirs, it is imperative to develop mining technologies that are in line with the characteristics of my country's reservoirs, and comprehensively apply theory and numerical calculation...

AI Technical Summary

Problems solved by technology

Combined with the low permeability characteristics of my country's oil reservoirs, it is imperative to develop mining technologies that are in line with the characteristics of my country's reservoirs, and comprehensively apply theory and numerical calculations as well as on-site measured data to strengthen the development of low-permeability oil and gas fields, which requires long-term stable on-site measured data Support the guidance of reservoir development, while the existing technology does not have long-term and stable monitoring of well logging devices for horizontal well completion and special insertion and sealing wells

Images