Heavy oil reservoir mining method

Abstract

The invention provides a heavy oil reservoir mining method. The heavy oil reservoir mining method is characterized by comprising the following steps that a steam producing well is arranged in a casing prestressed completion mode, wherein a steam pipe is located in a flow string; steam is fed into the steam pipe, wherein the dryness of the steam arriving at the well bottom is more than 60 percent; the flow string is used for pumping oil. According to a steam oil producing well, the steam pipe and the flow string are combined, the outlet of the steam pipe is close to the oil producing port, effective heat communication can be formed very easily, the needed time is short, and cost is reduced. A steam well and the oil producing well do not need to be dug respectively, the number of the wells is reduced, and cost is saved. The dryness of the steam in the well mouth is more than 75 percent, the temperature of the steam in the well mouth ranges from 300 DEG C to 400 DEG C, the dryness of the steam at the well bottom is more than 60 percent, the steam can dilute oil very well, and oil can be collected conveniently. A cavity wall vacuum pipeline with a good heat preservation effect is adopted as the steam pipe, the quality of the output steam is guaranteed, and oil can be produced well.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a heavy oil reservoir exploitation method. Background technique [0002] In oil extraction, due to the high viscosity of the oil in some oil fields, higher temperature steam is required to be injected into the oil well to dilute the oil, reduce the viscosity of the heavy oil, and make the crude oil easy to extract from the oil well. The steam generating equipment mostly uses a steam boiler, and the steam generated by the steam boiler is sent into the well through the pipeline and injected into the oil layer. The steam injection pipeline and the oil production pipeline are separated. Before the official oil production, it is generally necessary to inject steam downhole for a period of time, and the oil can only be produced after an effective heat connection is formed between the steam injection pipeline and the oil production pipeline. For example, Chin...

AI Technical Summary

Problems solved by technology

However, due to the need to form an effective heat connection between the steam injection pipeline and the oil production pipeline in the early stage, it takes a long time and requires a large initial investment