Hot fluid injection blockage relieving and production increasing process for immovable string

Abstract

The invention discloses a hot fluid injection blockage relieving and production increasing process for an immovable string. Hot fluid is injected into a stratum through thickened oil extraction equipment, and then well soaking, blowing and pump exhausting and production are conducted. According to the provided hot fluid injection blockage relieving and production increasing process for the immovable string, the operation cycle can be greatly shortened, the operation cost can be greatly reduced, pump starting and production can be timely conducted according to the condition of the output ratio of liquid, gas and oil during blowing, and the situation that the heat injection and production increasing effect is influenced due to operation of a movable string is avoided.

Description

technical field [0001] This article involves but is not limited to oil extraction equipment technology, especially a technology for unplugging and increasing production by injecting hot fluid into a fixed string. Background technique [0002] Bohai Oilfield is rich in heavy oil reserves, which can be divided into ordinary I heavy oil with a crude oil viscosity of 50-150 mPa·s, ordinary II heavy oil with a crude oil viscosity of 150-10,000 mPa·s, and extra heavy oil with a crude oil viscosity greater than 10,000 mPa·s. Reserves account for more than 70% of the total reserves. [0003] At present, the heavy oil of common class I of 50-150mPa·s and the heavy oil of common class II of 150-350mPa·s in Bohai Oilfield are mainly developed in cold recovery mode, through directional wells, infill adjustment wells, horizontal wells, water flooding and chemical flooding. development, but the overall performance is characterized by low oil production rate and low recovery degree, the d...

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Problems solved by technology

[0003] At present, the heavy oil of common class I of 50-150mPa·s and the heavy oil of common class II of 150-350mPa·s in Bohai Oilfield are mainly developed in the cold recovery mode, through directional wells, infill adjustment wells, horizontal wells, water flooding and chemical flooding. development, but the overall performance is characterized by low oil production rate and low recovery degree, the development effect is not ideal, and the initial production capacity of a single well is relatively high

Due to the high content of colloids and asphaltene in heavy oil, the viscosity of crude oil is high, and the fluidity is poor, the near wellbore area is easy to flocculate and deposit to form organic scale. Tubing shrinkage and electric submersible pump blockage lead to low production and low efficiency of oil wells; single well control reserves are high, but the recovery degree is low (generally 1%-8%), and the potential for tapping is great

The problem of organic clogging in the wellbore and near the wellbore has seriously affected the production effect of ordinary heavy oil wells and needs to be solved urgently

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