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

A thermal fluid and heat injection technology, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problems of clogging of electric submersible pump with reduced diameter of tubing, poor fluidity, and affecting the production effect of ordinary heavy oil wells, etc., to achieve Reduce operational safety risks and workload, optimize injection temperature and pressure, and ensure the effect of plugging removal and production increase

Inactive Publication Date: 2016-07-06
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0019] In order to make the purpose, technical solutions and advantages of this document clearer, the embodiments of this document will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0020] In the following description, a lot of specific details are set forth in order to fully understand this article, but this article can also be implemented in other ways than described here, therefore, the protection scope of this article is not limited by the specific embodiments disclosed below .

[0021] The following describes the heavy oil recovery equipment and the unplugging process of hot fluid injection in the fixed pipe string according to some embodiments of the present invention with reference to the accompanying drawings.

[0022] The heavy oil recovery equipment adopted in ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
CPCE21B43/24
Inventor 孙玉豹喻贵民林涛周治春张卫行梅伟姬辉宋宏志林姗姗
Owner CHINA NAT OFFSHORE OIL CORP
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