Method of improving production capacity of super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery

Abstract

The invention provides a method of improving production capacity of a super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery. The method comprises steps: 1, a downhole milling tool is tripped in; 2, a downhole motor is used for driving the downhole milling tool to open a window on a casing in a target layer position; 3, the downhole milling tool is pulled up; 4, a hydraulic jetting tool connected with a coiled tubing is tripped in; 5, high-pressure water is pumped from the ground, and water jet is used for drilling multiple branch well holes in the target layer; and 6, the hydraulic jetting tool is pulled up for steam injection production. According to the method of improving production capacity of the super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery, steam injection pressure is reduced, the steam absorption ability of the ground layer is added, the steam injection dryness and the steam zone diffusion range are improved, the flowing ability of the heavy oil in the ground layer is added, and the purpose of improving the production capacity of the single well is achieved.

Description

technical field [0001] The invention relates to the technical field of oil field recovery, in particular to a method for improving the productivity of a single well of an ultra-deep low-permeability heavy oil reservoir by using radial drilling to transform a reservoir and assisting steam thermal extraction. Background technique [0002] With the increasing emphasis on unconventional oil and gas resources, heavy oil, as an important part of petroleum energy, has become more and more prominent in its development potential. The exploration and development of heavy oil reservoirs have also shifted from the initial medium and shallow layers to the current ultra-deep layers. , in the development process of ultra-deep heavy oil, a series of contradictions caused by the characteristics of deep burial, high formation pressure and low permeability need to be resolved urgently. [0003] At present, the methods commonly used to stimulate reservoirs and establish high conductivity channe...

AI Technical Summary

Problems solved by technology

Among them, fracturing can form fractures with high conductivity in the formation, which can reduce the steam injection pressure on the surface and make the heavy oil in the reservoir easier to flow to the bottom of the well. However, because the direction of the fracture is affected by the principal stress of the formation, the direction of the fracture is difficult to control , and factors such as edge and bottom water and interlayer water will affect the implementation of the fracturing process

Although the above-mentioned problems do not exist in the development of horizontal wells, horizontal wells have certain requirements for reservoir thickness, and the drilling investment cost of horizontal wells is high, and the investment return period is long

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