Thermal recovery pipe column and oil recovery method thereof

Abstract

The invention provides a thermal recovery pipe column and an oil recovery method thereof. The thermal recovery pipe column comprises an oil pipe, packers, thermosensitive oil recovery valves and thermosensitive injection valves, wherein the oil pipe is arranged in a wellbore; the packers are arranged at a horizontal well section of the wellbore at intervals and located at the two sides of a casingpipe perforating hole or a screen pipe seam; the thermosensitive oil recovery valves are arranged on the oil pipe to be used for oil recovery, and correspond to areas of the casing pipe perforating hole or the screen pipe seam on the wellbore; the thermosensitive injection valves are used for injecting steam; and the thermosensitive injection valves are arranged behind the thermosensitive oil recovery valves, the thermosensitive injection valves and the thermosensitive oil recovery valves are arranged in an alternate mode in an horizontal section of the oil pipe, and the thermosensitive injection valves correspond to the areas of the casing pipe perforating hole or the screen pipe seam. The thermal recovery pipe column can improve the development degree of thick oil reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, and in particular relates to a thermal recovery pipe string and an oil recovery method for improving the development degree of heavy oil reservoirs. Background technique [0002] Heavy oil (heavy crude oil) refers to degassed crude oil with a viscosity of 100-1000mPa·s at the original reservoir temperature or a density of 0.9340-1.0000g / cm at 15.6°C and atmospheric pressure 3 . Heavy oil accounts for about 60% of the total petroleum resources. Due to the high viscosity of heavy oil, conventional oil recovery methods are difficult to develop, and downhole refueling must be carried out to reduce the viscosity before oil recovery. At present, the main method of thermal recovery is to inject high-temperature steam into the heavy oil reservoir, heat the heavy oil through heat conduction to reduce the viscosity, and then pump the heavy oil to the ground. [0003] At present, the main p...

AI Technical Summary

Problems solved by technology

[0003] At present, the main problems in the thermal recovery of heavy oil are: high round throughput, poor production effect; high comprehensive water cut, low recovery degree; many interlayers in the reservoir, strong reservoir heterogeneity

[0006] However, the existing tools and methods are still not efficient in the thermal recovery of heavy oil. After summarizing, there are two main reasons: one is that the steam is injected into the formation unevenly, and the other is that the steam injected and the heavy oil flow into the wellbore through the same channel, and the circulation range small, less active

Images