Method for compensating thermal energy of horizontal well mining heavy oil reservoirs in large power and subsection mode in pit

Abstract

The invention relates to a method of heavy oil thermal production in an oil field and underground coal bed thermal cracking gas production, in particular to a method for compensating thermal energy of horizontal well mining heavy oil reservoirs in a large power and subsection mode in a pit. According to the method, an oil well tubular column and an electric heater system are included. The oil well tubular column is composed of a well mouth device, a casing pipe, an oil pipe, a horizontal section sieve pipe and a packer. The electric heater system is composed of a ground part and an underground part. The ground part is composed of a power source control cabinet, a cable roller, a cable injection head, a cable conductor and a cable sealer. The underground part is a cable system composed of a mineral heating cable at the hot end and a mineral conductor cable at the cold end from bottom to top, so that injected steam of a straight well, an inclined well and a horizontal well of middle and deep heavy oil reservoirs are compensated, and the method can be used for crude oil production tracing heating of a horizontal section of the horizontal well and a fireflood oil production igniter.

Description

technical field [0001] The invention relates to a method for thermal exploitation of heavy oil in an oil field and a method for gas recovery by thermal cracking of an underground coal seam, in particular to a method for sub-level compensation of heat energy with high power underground in a horizontal well exploitation heavy oil reservoir. Background technique [0002] my country has considerable reserves of heavy oil resources, and has the characteristics of deep burial and high viscosity. Oilfields mainly use steam injection thermal recovery for heavy oil production, that is, injecting high-temperature and high-pressure steam into the formation. The first purpose is to increase the temperature of the oil layer and reduce the viscosity of heavy oil, and the second is to increase the pressure of the oil layer and increase the oil displacement capacity. Well completion methods include vertical wells and horizontal wells. [0003] During the steam injection process, it is main...

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Problems solved by technology

[0004] For the continuous application of medium and deep oil formations, the conventional steam injection technology has become helpless, because the water vapor injected into the wellbore is a two-phase flow, including saturated steam (gas phase) and saturated water (liquid phase). As the depth increases, during the flow along the wellbore, the heat is continuously lost to the formation, and the pressure and temperature of the water vapor are constantly changing. The corresponding relationship makes the water vapor undergo a phase change, and the parameters such as the density and viscosity of the water vapor also increase accordingly, and the thermal recovery effect becomes worse.

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