Method for improving dryness of deep well thickened oil well bottom steam through electric heating

Abstract

The invention relates to a method for improving dryness of deep well thickened oil well bottom steam through electric heating. The method comprises the steps that (1) after being separated through a steam-liquid separation device, steam generated by a ground boiler is conveyed to a well mouth of an injection well through a pipeline; (2) the tail end of a production casing pipe in a shaft of the injection well is connected with an oil layer screen pipe through a suspender, and a heat insulation oil pipe is mounted in the production sleeve pipe; (3) a continuous oil pipe is mounted in a steam injection oil pipe, a conveying cable is arranged in the continuous oil pipe, and the front end of the conveying cable is connected with a heating resistor; and (4) steam of the well mouth is injected into the shaft through the steam injection oil pipe, condensation water gathered around the well bottom is secondarily heated by adjusting the input electric power of the heating resistor, the condensation water is evaporated into saturated steam, and the dryness of steam injected into the well bottom is improved. According to the method, the principle is reliable, operation is simple and convenient, the exploitation efficiency of deep well thickened oil SAGD and steam flooding is greatly improved, and wide market prospects are achieved.

Description

technical field [0001] The invention relates to a method for improving the dryness of steam at the bottom of a heavy oil well in a deep well by using electric heating in the field of heavy oil development. Background technique [0002] Steam-assisted gravity drainage technology (SAGD) relies on high-dryness steam as the heat carrier, and the latent heat of vaporization in the steam is partially transferred to the reservoir for heating, and the crude oil with reduced viscosity mainly relies on the driving force of gravity to drain to the production well along the vapor-liquid interface And mining. The applicable conditions of SAGD are that the oil layer thickness is greater than 20m, the buried depth is less than 1000m, the horizontal permeability is greater than 500mD, the ratio of vertical and horizontal permeability is greater than 0.3, and there is no continuous interlayer. The SAGD production method can be applied to heavy oil with different viscosities, including super...

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Problems solved by technology

Due to the low dryness of the steam entering the reservoir and a large amount of condensed water brought in at the same time, the expansion of the steam chamber in SAGD and steam flooding reservoirs is limited, resulting in poor development effects, and it is difficult to obtain economic benefits for heavy oil recovery

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